// Package config manages Pulse configuration from multiple sources.
//
// Configuration File Separation:
//   - .env: Authentication credentials ONLY (PULSE_AUTH_USER, PULSE_AUTH_PASS)
//   - system.json: Application settings (polling interval, timeouts, update settings, etc.)
//   - nodes.enc: Encrypted node credentials (PVE/PBS passwords and tokens)
//
// This separation ensures security, clarity, and proper access control.
// See docs/CONFIGURATION.md for detailed documentation.
package config

import (
	"encoding/json"
	"fmt"
	"net"
	"os"
	"os/exec"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"sync"

	"github.com/joho/godotenv"
	"github.com/rcourtman/pulse-go-rewrite/internal/logging"
	"github.com/rcourtman/pulse-go-rewrite/internal/utils"
	"github.com/rcourtman/pulse-go-rewrite/pkg/auth"
	pkglicensing "github.com/rcourtman/pulse-go-rewrite/pkg/licensing"
	"github.com/rcourtman/pulse-go-rewrite/pkg/tlsutil"
	"github.com/rs/zerolog/log"
)

// Mu protects concurrent access to the configuration,
// particularly for fields updated by the config watcher (AuthUser, AuthPass, APITokens).
var Mu sync.RWMutex

const (
	DefaultGuestMetadataMinRefresh    = 2 * time.Minute
	DefaultGuestMetadataRefreshJitter = 45 * time.Second
	DefaultGuestMetadataRetryBackoff  = 30 * time.Second
	DefaultGuestMetadataMaxConcurrent = 4
)

// Vars for mocking system calls in tests
var (
	osStat            = os.Stat
	execCommand       = exec.Command
	hashPasswordFn    = auth.HashPassword
	netDial           = net.Dial
	netInterfaceAddrs = net.InterfaceAddrs
)

// CanonicalUpdateChannel returns the supported v6 update channel if valid.
func CanonicalUpdateChannel(channel string) (string, bool) {
	switch strings.ToLower(strings.TrimSpace(channel)) {
	case "stable":
		return "stable", true
	case "rc":
		return "rc", true
	default:
		return "", false
	}
}

// EffectiveUpdateChannel resolves the runtime update channel using persisted
// settings first and a fallback runtime/config value second. v6 only supports
// stable and rc, and defaults to stable when unset.
func EffectiveUpdateChannel(channel string, fallback string) string {
	if canonical, ok := CanonicalUpdateChannel(channel); ok {
		return canonical
	}
	if canonical, ok := CanonicalUpdateChannel(fallback); ok {
		return canonical
	}
	return "stable"
}

// EffectiveAutoUpdateEnabled enforces the v6 policy that unattended
// auto-updates only run on the stable channel.
func EffectiveAutoUpdateEnabled(channel string, enabled bool) bool {
	return enabled && EffectiveUpdateChannel(channel, "") == "stable"
}

// IsPasswordHashed checks if a string looks like a bcrypt hash
func IsPasswordHashed(password string) bool {
	// Bcrypt hashes start with $2a$, $2b$, or $2y$ and are 60 characters long
	// We check for >= 55 to catch truncated hashes and warn users
	if !strings.HasPrefix(password, "$2") {
		return false
	}

	length := len(password)
	if length == 60 {
		return true // Perfect bcrypt hash
	}

	// Warn about truncated or invalid hashes
	if length >= 55 && length < 60 {
		log.Error().
			Int("length", length).
			Msg("Bcrypt hash appears truncated; expected 60 characters; treating value as plaintext")
		return false // Treat as plaintext to force user to fix it
	}

	return false
}

func normalizeEnvAuthPassword(raw string) (string, error) {
	password := strings.Trim(raw, "'\"")
	if password == "" {
		return "", nil
	}

	if !IsPasswordHashed(password) {
		hashedPass, err := hashPasswordFn(password)
		if err != nil {
			return "", fmt.Errorf("hash PULSE_AUTH_PASS: %w", err)
		}
		return hashedPass, nil
	}

	if len(password) != 60 {
		log.Error().
			Int("length", len(password)).
			Str("env_var", "PULSE_AUTH_PASS").
			Msg("Bcrypt hash appears truncated; expected 60 characters; authentication may fail")
		log.Error().
			Str("env_var", "PULSE_AUTH_PASS").
			Msg("Ensure the full bcrypt hash is enclosed in single quotes in your .env file or Docker environment")
	}

	return password, nil
}

// Config holds all application configuration
// NOTE: The envconfig tags are legacy and not used - configuration is loaded from encrypted JSON files
type Config struct {
	// Server settings
	BindAddress     string
	FrontendPort    int `envconfig:"FRONTEND_PORT" default:"7655"`
	ConfigPath      string
	DataPath        string
	AppRoot         string `json:"-"`                                        // Root directory of the application (where binary lives)
	PublicURL       string `envconfig:"PULSE_PUBLIC_URL" default:""`         // Full URL to access Pulse (e.g., http://198.51.100.100:7655)
	AgentConnectURL string `envconfig:"PULSE_AGENT_CONNECT_URL" default:""`  // Dedicated direct connect URL for agents (e.g. http://192.0.2.5:7655)
	AgentIngestPort int    `envconfig:"PULSE_AGENT_INGEST_PORT" default:"0"` // When >0, additionally serve agent ingest (/api/agents/*) on this dedicated port so it can be network-isolated from the UI/API. 0 = disabled (single-port, default).

	// Proxmox VE connections
	PVEInstances []PVEInstance

	// Proxmox Backup Server connections
	PBSInstances []PBSInstance

	// Proxmox Mail Gateway connections
	PMGInstances []PMGInstance

	// Monitoring settings
	PVEPollingInterval              time.Duration `envconfig:"PVE_POLLING_INTERVAL"`             // PVE polling interval (10s default)
	PBSPollingInterval              time.Duration `envconfig:"PBS_POLLING_INTERVAL"`             // PBS polling interval (60s default)
	PMGPollingInterval              time.Duration `envconfig:"PMG_POLLING_INTERVAL"`             // PMG polling interval (60s default)
	ConnectionTimeout               time.Duration `envconfig:"CONNECTION_TIMEOUT" default:"60s"` // Default 60s for slow storage operations
	BackupPollingCycles             int           `envconfig:"BACKUP_POLLING_CYCLES" default:"10"`
	BackupPollingInterval           time.Duration `envconfig:"BACKUP_POLLING_INTERVAL"`
	EnableBackupPolling             bool          `envconfig:"ENABLE_BACKUP_POLLING" default:"true"`
	TemperatureMonitoringEnabled    bool          `json:"temperatureMonitoringEnabled"`
	WebhookBatchDelay               time.Duration `envconfig:"WEBHOOK_BATCH_DELAY" default:"10s"`
	AdaptivePollingEnabled          bool          `envconfig:"ADAPTIVE_POLLING_ENABLED" default:"false"`
	AdaptivePollingBaseInterval     time.Duration `envconfig:"ADAPTIVE_POLLING_BASE_INTERVAL" default:"10s"`
	AdaptivePollingMinInterval      time.Duration `envconfig:"ADAPTIVE_POLLING_MIN_INTERVAL" default:"5s"`
	AdaptivePollingMaxInterval      time.Duration `envconfig:"ADAPTIVE_POLLING_MAX_INTERVAL" default:"5m"`
	GuestMetadataMinRefreshInterval time.Duration `envconfig:"GUEST_METADATA_MIN_REFRESH_INTERVAL" default:"2m" json:"guestMetadataMinRefreshInterval"`
	GuestMetadataRefreshJitter      time.Duration `envconfig:"GUEST_METADATA_REFRESH_JITTER" default:"45s" json:"guestMetadataRefreshJitter"`
	GuestMetadataRetryBackoff       time.Duration `envconfig:"GUEST_METADATA_RETRY_BACKOFF" default:"30s" json:"guestMetadataRetryBackoff"`
	GuestMetadataMaxConcurrent      int           `envconfig:"GUEST_METADATA_MAX_CONCURRENT" default:"4" json:"guestMetadataMaxConcurrent"`
	DNSCacheTimeout                 time.Duration `envconfig:"DNS_CACHE_TIMEOUT" default:"5m" json:"dnsCacheTimeout"`
	SSHPort                         int           `envconfig:"SSH_PORT" default:"22" json:"sshPort"`   // Default SSH port for temperature monitoring
	MaxPollTimeout                  time.Duration `envconfig:"MAX_POLL_TIMEOUT" default:"3m" json:"-"` // Maximum poll timeout for large clusters (default 3m)

	// Metrics retention settings (tiered storage)
	// These control how long historical metrics are retained at each aggregation level.
	MetricsRetentionRawHours    int           `json:"metricsRetentionRawHours"`    // Raw data (~5s intervals), default: 2 hours
	MetricsRetentionMinuteHours int           `json:"metricsRetentionMinuteHours"` // Minute averages, default: 24 hours
	MetricsRetentionHourlyDays  int           `json:"metricsRetentionHourlyDays"`  // Hourly averages, default: 7 days
	MetricsRetentionDailyDays   int           `json:"metricsRetentionDailyDays"`   // Daily averages, default: 90 days
	MetricsDBPath               string        `json:"-"`                           // Optional env-only SQLite path override for metrics.db
	MetricsRollupInterval       time.Duration `json:"-"`                           // Optional env-only rollup cadence override

	// Logging settings
	LogLevel    string `envconfig:"LOG_LEVEL" default:"info"`
	LogFormat   string `envconfig:"LOG_FORMAT" default:"auto"` // "json", "console", or "auto"
	LogFile     string `envconfig:"LOG_FILE" default:""`
	LogMaxSize  int    `envconfig:"LOG_MAX_SIZE" default:"100"` // MB
	LogMaxAge   int    `envconfig:"LOG_MAX_AGE" default:"30"`   // days
	LogCompress bool   `envconfig:"LOG_COMPRESS" default:"true"`

	// Security settings
	APIToken                          string
	APITokens                         []APITokenRecord `json:"-"`
	AuthUser                          string           `envconfig:"PULSE_AUTH_USER"`
	AuthPass                          string           `envconfig:"PULSE_AUTH_PASS"`
	DemoMode                          bool             `envconfig:"DEMO_MODE" default:"false"` // Read-only demo mode
	AllowedOrigins                    string           `envconfig:"ALLOWED_ORIGINS" default:"*"`
	HideLocalLogin                    bool             `envconfig:"PULSE_AUTH_HIDE_LOCAL_LOGIN" default:"false"`
	DisableDockerUpdateActions        bool             `envconfig:"PULSE_DISABLE_DOCKER_UPDATE_ACTIONS" default:"false"`                  // Hide Docker update buttons (read-only mode for containers)
	EnableProxmoxGuestDockerDetection bool             `envconfig:"PULSE_ENABLE_PROXMOX_GUEST_DOCKER_DETECTION" default:"false" json:"-"` // Allow Proxmox-side pct exec probes that only detect Docker socket presence inside LXC guests
	EnableProxmoxGuestDockerInventory bool             `envconfig:"PULSE_ENABLE_PROXMOX_GUEST_DOCKER_INVENTORY" default:"false" json:"-"` // Allow Proxmox-side pct exec collection of minimal Docker inventory from LXC guests
	ProxmoxGuestDockerInventoryVMIDs  string           `envconfig:"PULSE_PROXMOX_GUEST_DOCKER_INVENTORY_VMIDS" default:"" json:"-"`       // Optional comma-separated Proxmox VMID allowlist for LXC Docker inventory
	TelemetryEnabled                  bool             `envconfig:"PULSE_TELEMETRY" default:"true"`                                       // Outbound usage telemetry enabled by default (pseudonymous install ID, version, resource counts, feature flags — opt out any time)
	MultiTenantEnabled                bool             `envconfig:"PULSE_MULTI_TENANT_ENABLED" default:"false"`                           // Enable multi-tenant support
	MetricsToken                      string           `envconfig:"PULSE_METRICS_TOKEN" default:"" json:"-"`                              // Bearer token for /metrics endpoint (empty = unauthenticated)
	MetricsBindAddress                string           `envconfig:"PULSE_METRICS_BIND_ADDRESS" default:"127.0.0.1" json:"-"`              // Bind address for /metrics endpoint
	MetricsAllowInsecureRemote        bool             `envconfig:"PULSE_METRICS_ALLOW_INSECURE_REMOTE" default:"false" json:"-"`         // Explicit opt-in for bearer-token metrics over remote plaintext HTTP
	ProTrialSignupURL                 string           `envconfig:"PULSE_PRO_TRIAL_SIGNUP_URL" default:""`                                // Legacy hosted commercial base URL used for entitlement refresh compatibility

	// Proxy authentication settings
	ProxyAuthSecret        string `envconfig:"PROXY_AUTH_SECRET"`
	ProxyAuthUserHeader    string `envconfig:"PROXY_AUTH_USER_HEADER"`
	ProxyAuthRoleHeader    string `envconfig:"PROXY_AUTH_ROLE_HEADER"`
	ProxyAuthRoleSeparator string `envconfig:"PROXY_AUTH_ROLE_SEPARATOR" default:"|"`
	ProxyAuthAdminRole     string `envconfig:"PROXY_AUTH_ADMIN_ROLE" default:"admin"`
	ProxyAuthLogoutURL     string `envconfig:"PROXY_AUTH_LOGOUT_URL"`

	// HTTPS/TLS settings
	HTTPSEnabled     bool   `envconfig:"HTTPS_ENABLED" default:"false"`
	TLSCertFile      string `envconfig:"TLS_CERT_FILE" default:""`
	TLSKeyFile       string `envconfig:"TLS_KEY_FILE" default:""`
	HTTPRedirectPort int    `envconfig:"HTTP_REDIRECT_PORT" default:"0"` // When HTTPS is enabled, start an HTTP listener on this port that redirects to HTTPS (0 = disabled)

	// Update settings
	UpdateChannel           string
	AutoUpdateEnabled       bool
	AutoUpdateCheckInterval time.Duration
	AutoUpdateTime          string

	// Discovery settings
	DiscoveryEnabled bool            `envconfig:"DISCOVERY_ENABLED" default:"false"`
	DiscoverySubnet  string          `envconfig:"DISCOVERY_SUBNET" default:"auto"`
	Discovery        DiscoveryConfig `json:"discoveryConfig"`

	// Track which settings are overridden by environment variables
	EnvOverrides map[string]bool `json:"-"`
}

// DiscoveryConfig captures overrides for network discovery behaviour.
type DiscoveryConfig struct {
	EnvironmentOverride string   `json:"environment_override,omitempty"`
	SubnetAllowlist     []string `json:"subnet_allowlist,omitempty"`
	SubnetBlocklist     []string `json:"subnet_blocklist,omitempty"`
	IPBlocklist         []string `json:"ip_blocklist,omitempty"` // Individual IPs to skip (auto-populated with configured Proxmox hosts)
	MaxHostsPerScan     int      `json:"max_hosts_per_scan,omitempty"`
	MaxConcurrent       int      `json:"max_concurrent,omitempty"`
	EnableReverseDNS    bool     `json:"enable_reverse_dns"`
	ScanGateways        bool     `json:"scan_gateways"`
	DialTimeout         int      `json:"dial_timeout_ms,omitempty"`
	HTTPTimeout         int      `json:"http_timeout_ms,omitempty"`
}

// DefaultDiscoveryConfig returns opinionated defaults for discovery behaviour.
func DefaultDiscoveryConfig() DiscoveryConfig {
	return DiscoveryConfig{
		EnvironmentOverride: "auto",
		SubnetAllowlist:     nil,
		SubnetBlocklist:     []string{"169.254.0.0/16"},
		MaxHostsPerScan:     1024,
		MaxConcurrent:       50,
		EnableReverseDNS:    true,
		ScanGateways:        true,
		DialTimeout:         1000,
		HTTPTimeout:         2000,
	}
}

// CloneDiscoveryConfig returns a deep copy of the provided discovery config.
func CloneDiscoveryConfig(cfg DiscoveryConfig) DiscoveryConfig {
	clone := cfg
	if cfg.SubnetAllowlist != nil {
		clone.SubnetAllowlist = append([]string(nil), cfg.SubnetAllowlist...)
	}
	if cfg.SubnetBlocklist != nil {
		clone.SubnetBlocklist = append([]string(nil), cfg.SubnetBlocklist...)
	}
	if cfg.IPBlocklist != nil {
		clone.IPBlocklist = append([]string(nil), cfg.IPBlocklist...)
	}
	return clone
}

// DeepCopy creates a deep copy of the Config struct.
// This is important for tenant isolation to ensure each tenant
// has independent config data that won't be shared.
func (c *Config) DeepCopy() *Config {
	if c == nil {
		return nil
	}

	// Start with a shallow copy
	clone := *c

	// Deep copy PVEInstances slice
	if len(c.PVEInstances) > 0 {
		clone.PVEInstances = make([]PVEInstance, len(c.PVEInstances))
		copy(clone.PVEInstances, c.PVEInstances)
	}

	// Deep copy PBSInstances slice
	if len(c.PBSInstances) > 0 {
		clone.PBSInstances = make([]PBSInstance, len(c.PBSInstances))
		copy(clone.PBSInstances, c.PBSInstances)
	}

	// Deep copy PMGInstances slice
	if len(c.PMGInstances) > 0 {
		clone.PMGInstances = make([]PMGInstance, len(c.PMGInstances))
		copy(clone.PMGInstances, c.PMGInstances)
	}

	// Deep copy APITokens slice
	if len(c.APITokens) > 0 {
		clone.APITokens = make([]APITokenRecord, len(c.APITokens))
		for i, token := range c.APITokens {
			clone.APITokens[i] = token.Clone()
		}
	}

	// Deep copy EnvOverrides map
	if len(c.EnvOverrides) > 0 {
		clone.EnvOverrides = make(map[string]bool, len(c.EnvOverrides))
		for k, v := range c.EnvOverrides {
			clone.EnvOverrides[k] = v
		}
	}

	// Deep copy Discovery config
	clone.Discovery = CloneDiscoveryConfig(c.Discovery)

	return &clone
}

// NormalizeDiscoveryConfig ensures a discovery config contains sane values and defaults.
func NormalizeDiscoveryConfig(cfg DiscoveryConfig) DiscoveryConfig {
	defaults := DefaultDiscoveryConfig()
	normalized := CloneDiscoveryConfig(cfg)

	// Normalize environment override and ensure it's valid.
	if canonicalEnv, ok := CanonicalDiscoveryEnvironment(normalized.EnvironmentOverride); ok {
		normalized.EnvironmentOverride = canonicalEnv
	} else {
		log.Warn().
			Str("environment", normalized.EnvironmentOverride).
			Msg("Unknown discovery environment override detected; falling back to auto")
		normalized.EnvironmentOverride = defaults.EnvironmentOverride
	}

	normalized.SubnetAllowlist = sanitizeCIDRList(normalized.SubnetAllowlist)
	if normalized.SubnetAllowlist == nil {
		normalized.SubnetAllowlist = []string{}
	}

	normalized.SubnetBlocklist = sanitizeCIDRList(normalized.SubnetBlocklist)
	if normalized.SubnetBlocklist == nil {
		normalized.SubnetBlocklist = append([]string(nil), defaults.SubnetBlocklist...)
	}

	if normalized.MaxHostsPerScan <= 0 {
		normalized.MaxHostsPerScan = defaults.MaxHostsPerScan
	}
	if normalized.MaxConcurrent <= 0 {
		normalized.MaxConcurrent = defaults.MaxConcurrent
	}
	if normalized.DialTimeout <= 0 {
		normalized.DialTimeout = defaults.DialTimeout
	}
	if normalized.HTTPTimeout <= 0 {
		normalized.HTTPTimeout = defaults.HTTPTimeout
	}

	return normalized
}

func sanitizeCIDRList(values []string) []string {
	if len(values) == 0 {
		return nil
	}
	cleaned := make([]string, 0, len(values))
	seen := make(map[string]struct{}, len(values))
	for _, raw := range values {
		entry := strings.TrimSpace(raw)
		if entry == "" {
			continue
		}
		// Avoid duplicates to keep config minimal.
		if _, exists := seen[entry]; exists {
			continue
		}
		seen[entry] = struct{}{}
		cleaned = append(cleaned, entry)
	}
	if len(cleaned) == 0 {
		return []string{}
	}
	return cleaned
}

// UnmarshalJSON decodes the persisted snake_case discovery config format.
func (d *DiscoveryConfig) UnmarshalJSON(data []byte) error {
	type payload struct {
		EnvironmentOverride *string   `json:"environment_override"`
		SubnetAllowlist     *[]string `json:"subnet_allowlist"`
		SubnetBlocklist     *[]string `json:"subnet_blocklist"`
		MaxHostsPerScan     *int      `json:"max_hosts_per_scan"`
		MaxConcurrent       *int      `json:"max_concurrent"`
		EnableReverseDNS    *bool     `json:"enable_reverse_dns"`
		ScanGateways        *bool     `json:"scan_gateways"`
		DialTimeout         *int      `json:"dial_timeout_ms"`
		HTTPTimeout         *int      `json:"http_timeout_ms"`
	}

	var in payload
	if err := json.Unmarshal(data, &in); err != nil {
		return fmt.Errorf("unmarshal discovery config: %w", err)
	}

	cfg := DefaultDiscoveryConfig()

	if in.EnvironmentOverride != nil {
		cfg.EnvironmentOverride = strings.TrimSpace(*in.EnvironmentOverride)
	}

	switch {
	case in.SubnetAllowlist != nil:
		cfg.SubnetAllowlist = sanitizeCIDRList(*in.SubnetAllowlist)
	default:
		cfg.SubnetAllowlist = []string{}
	}

	switch {
	case in.SubnetBlocklist != nil:
		cfg.SubnetBlocklist = sanitizeCIDRList(*in.SubnetBlocklist)
	}

	if in.MaxHostsPerScan != nil {
		cfg.MaxHostsPerScan = *in.MaxHostsPerScan
	}

	if in.MaxConcurrent != nil {
		cfg.MaxConcurrent = *in.MaxConcurrent
	}

	if in.EnableReverseDNS != nil {
		cfg.EnableReverseDNS = *in.EnableReverseDNS
	}

	if in.ScanGateways != nil {
		cfg.ScanGateways = *in.ScanGateways
	}

	if in.DialTimeout != nil {
		cfg.DialTimeout = *in.DialTimeout
	}

	if in.HTTPTimeout != nil {
		cfg.HTTPTimeout = *in.HTTPTimeout
	}

	*d = NormalizeDiscoveryConfig(cfg)
	return nil
}

// IsValidDiscoveryEnvironment reports whether the supplied override is recognised.
func IsValidDiscoveryEnvironment(value string) bool {
	_, ok := CanonicalDiscoveryEnvironment(value)
	return ok
}

// CanonicalDiscoveryEnvironment returns the canonical discovery environment token.
// Only canonical v6 hyphen-separated tokens are accepted.
func CanonicalDiscoveryEnvironment(value string) (string, bool) {
	normalized := strings.ToLower(strings.TrimSpace(value))
	switch normalized {
	case "", "auto":
		return "auto", true
	case "native", "docker-host", "docker-bridge", "lxc-privileged", "lxc-unprivileged":
		return normalized, true
	default:
		return "", false
	}
}

func splitAndTrim(value string) []string {
	if value == "" {
		return []string{}
	}
	parts := strings.Split(value, ",")
	result := make([]string, 0, len(parts))
	for _, part := range parts {
		trimmed := strings.TrimSpace(part)
		if trimmed != "" {
			result = append(result, trimmed)
		}
	}
	return result
}

func parsePortOverride(envVar, value string) (int, error) {
	port, err := strconv.Atoi(strings.TrimSpace(value))
	if err != nil {
		return 0, fmt.Errorf("%s must be an integer", envVar)
	}
	if port <= 0 || port > 65535 {
		return 0, fmt.Errorf("%s must be between 1 and 65535", envVar)
	}
	return port, nil
}

func parseConnectionTimeoutOverride(value string) (time.Duration, error) {
	raw := strings.TrimSpace(value)
	if raw == "" {
		return 0, fmt.Errorf("connection timeout value cannot be empty")
	}
	if looksLikeNumericSeconds(raw) {
		return time.ParseDuration(raw + "s")
	}
	return time.ParseDuration(raw)
}

func looksLikeNumericSeconds(value string) bool {
	if value == "" {
		return false
	}
	if value[0] == '+' || value[0] == '-' {
		value = value[1:]
		if value == "" {
			return false
		}
	}
	dotSeen := false
	for _, ch := range value {
		if ch == '.' {
			if dotSeen {
				return false
			}
			dotSeen = true
			continue
		}
		if ch < '0' || ch > '9' {
			return false
		}
	}
	return true
}

// PVEInstance represents a Proxmox VE connection
type PVEInstance struct {
	Name                         string
	Host                         string // Primary endpoint (user-provided)
	GuestURL                     string // Optional guest-accessible URL (for navigation)
	User                         string
	Password                     string
	TokenName                    string
	TokenValue                   string
	Fingerprint                  string
	VerifySSL                    bool
	MonitorVMs                   bool
	MonitorContainers            bool
	MonitorStorage               bool
	MonitorBackups               bool
	MonitorPhysicalDisks         *bool // Monitor physical disks (nil = enabled by default, can be explicitly disabled)
	PhysicalDiskPollingMinutes   int   // How often to poll physical disks (0 = use default)
	TemperatureMonitoringEnabled *bool // Monitor temperature via SSH (nil = use global setting, true/false = override)
	SSHPort                      int   // SSH port for temperature monitoring (0 = use global default)

	// Cluster support
	IsCluster        bool              // True if this is a cluster
	ClusterName      string            // Cluster name if applicable
	ClusterEndpoints []ClusterEndpoint // All discovered cluster nodes

	// Agent tracking
	Source      string // "agent" or "script" - how this node was registered (empty = legacy/manual)
	DisableCeph bool   // Disable Ceph status polling for this instance

	// Lifecycle. Disabled (not Enabled) so the zero value means "poll" —
	// existing nodes.json records from before this field existed load
	// unpaused without a schema migration.
	Disabled bool `json:"disabled,omitempty"`
}

// ClusterEndpoint represents a single node in a cluster
type ClusterEndpoint struct {
	NodeID         string     // Node ID in cluster
	NodeName       string     // Node name
	Host           string     // Full URL (e.g., https://node1.lan:8006)
	GuestURL       string     // Optional guest-accessible URL (for navigation)
	IP             string     // IP address (auto-discovered from cluster)
	IPOverride     string     // User-specified IP override (takes precedence over IP if set)
	Fingerprint    string     // TLS certificate fingerprint (SHA256, auto-captured via TOFU)
	Online         bool       // Current online status from Proxmox
	LastSeen       time.Time  // Last successful connection
	PulseReachable *bool      // Pulse's view: can Pulse reach this endpoint? nil = not yet checked
	LastPulseCheck *time.Time // Last time Pulse checked connectivity
	PulseError     string     // Last error Pulse encountered connecting to this endpoint
}

// EffectiveIP returns the IP to use for this endpoint, preferring IPOverride if set
func (e ClusterEndpoint) EffectiveIP() string {
	if e.IPOverride != "" {
		return e.IPOverride
	}
	return e.IP
}

// PBSInstance represents a Proxmox Backup Server connection
type PBSInstance struct {
	Name                         string
	Host                         string
	GuestURL                     string // Optional guest-accessible URL (for navigation)
	User                         string
	Password                     string
	TokenName                    string
	TokenValue                   string
	Fingerprint                  string
	VerifySSL                    bool
	MonitorBackups               bool
	MonitorDatastores            bool
	MonitorSyncJobs              bool
	MonitorVerifyJobs            bool
	MonitorPruneJobs             bool
	MonitorGarbageJobs           bool
	TemperatureMonitoringEnabled *bool // Monitor temperature via SSH (nil = use global setting, true/false = override)
	SSHPort                      int   // SSH port for temperature monitoring (0 = use global default)

	// Agent tracking
	Source      string // "agent" or "script" - how this node was registered (empty = legacy/manual)
	DisableCeph bool   // Disable Ceph status polling for this instance

	// Datastore exclusion (for unmounted/removable datastores that cause log noise)
	ExcludeDatastores []string

	// Lifecycle. See PVEInstance.Disabled.
	Disabled bool `json:"disabled,omitempty"`
}

// PMGInstance represents a Proxmox Mail Gateway connection
type PMGInstance struct {
	Name        string
	Host        string
	GuestURL    string // Optional guest-accessible URL (for navigation)
	User        string
	Password    string
	TokenName   string
	TokenValue  string
	Fingerprint string
	VerifySSL   bool

	MonitorMailStats             bool
	MonitorQueues                bool
	MonitorQuarantine            bool
	MonitorDomainStats           bool
	TemperatureMonitoringEnabled *bool // Monitor temperature via SSH (nil = use global setting, true/false = override)
	SSHPort                      int   // SSH port for temperature monitoring (0 = use global default)

	// Lifecycle. See PVEInstance.Disabled.
	Disabled bool `json:"disabled,omitempty"`
}

// Global persistence instance for saving
var globalPersistence *ConfigPersistence

// defaultDataDir is the fallback config/data directory when PULSE_DATA_DIR is not set.
// Kept as a var to allow tests to override without requiring /etc/pulse to exist.
var defaultDataDir = "/etc/pulse"

// ResolveRuntimeDataDir returns the canonical runtime data directory for Pulse.
// Callers may provide an explicit owner path; otherwise the resolved directory
// comes from PULSE_DATA_DIR and finally the package default.
func ResolveRuntimeDataDir(explicitPath string) string {
	return utils.ResolveDataDirWithDefault(explicitPath, defaultDataDir)
}

// parsePollingIntervalEnv reads an environment variable that represents a polling
// interval (accepts Go duration strings like "30s" or plain integer seconds),
// validates that it meets a minimum, and returns the parsed duration. Returns
// (0, false) when the env var is unset or the value is invalid/below minimum.
func parsePollingIntervalEnv(envName string, minDuration time.Duration) (time.Duration, bool) {
	intervalStr := utils.GetenvTrim(envName)
	if intervalStr == "" {
		return 0, false
	}

	if dur, err := time.ParseDuration(intervalStr); err == nil {
		if dur < minDuration {
			log.Warn().Dur("interval", dur).Msgf("Ignoring %s below %s from environment", envName, minDuration)
			return 0, false
		}
		log.Info().Dur("interval", dur).Msgf("Overriding %s polling interval from environment", strings.TrimSuffix(envName, "_POLLING_INTERVAL"))
		return dur, true
	}

	if seconds, err := strconv.Atoi(intervalStr); err == nil {
		if time.Duration(seconds)*time.Second < minDuration {
			log.Warn().Int("seconds", seconds).Msgf("Ignoring %s below %s from environment", envName, minDuration)
			return 0, false
		}
		log.Info().Int("seconds", seconds).Msgf("Overriding %s polling interval (seconds) from environment", strings.TrimSuffix(envName, "_POLLING_INTERVAL"))
		return time.Duration(seconds) * time.Second, true
	}

	log.Warn().Str("value", intervalStr).Msgf("Invalid %s value, expected duration or seconds", envName)
	return 0, false
}

func parseDurationOverrideEnv(envName string, minDuration time.Duration) (time.Duration, bool) {
	value := utils.GetenvTrim(envName)
	if value == "" {
		return 0, false
	}

	if dur, err := time.ParseDuration(value); err == nil {
		if dur < minDuration {
			log.Warn().Dur("duration", dur).Msgf("Ignoring %s below %s from environment", envName, minDuration)
			return 0, false
		}
		return dur, true
	}

	if seconds, err := strconv.Atoi(value); err == nil {
		dur := time.Duration(seconds) * time.Second
		if dur < minDuration {
			log.Warn().Int("seconds", seconds).Msgf("Ignoring %s below %s from environment", envName, minDuration)
			return 0, false
		}
		return dur, true
	}

	log.Warn().Str("value", value).Msgf("Invalid %s value, expected duration or seconds", envName)
	return 0, false
}

// Load reads configuration from encrypted persistence files.
func Load() (*Config, error) {
	return load(true)
}

// LoadWithoutLoggingInit reads configuration without reinitializing the global logger.
// Reload paths use this to avoid racing with long-lived background goroutines that are
// still emitting through zerolog/log while the new config is being loaded.
func LoadWithoutLoggingInit() (*Config, error) {
	return load(false)
}

func load(initLogging bool) (*Config, error) {
	// Get data directory from environment
	dataDir := ResolveRuntimeDataDir("")

	// Load .env file if it exists (for deployment overrides)
	envFile := filepath.Join(dataDir, ".env")
	if _, err := os.Stat(envFile); err == nil {
		if err := godotenv.Load(envFile); err != nil {
			log.Warn().Err(err).Str("file", envFile).Msg("Failed to load .env file")
		} else {
			log.Info().Str("file", envFile).Msg("Loaded .env file for deployment overrides")
		}
	}

	// Also try loading from current directory for development
	if err := godotenv.Load(); err == nil {
		log.Info().Msg("Loaded configuration from .env in current directory")
	}

	// Initialize config with defaults
	cfg := &Config{
		BindAddress:                     "0.0.0.0",
		FrontendPort:                    7655,
		ConfigPath:                      dataDir,
		DataPath:                        dataDir,
		AppRoot:                         detectAppRoot(),
		ConnectionTimeout:               60 * time.Second,
		BackupPollingCycles:             10,
		BackupPollingInterval:           0,
		EnableBackupPolling:             true,
		PVEPollingInterval:              10 * time.Second,
		AdaptivePollingEnabled:          false,
		AdaptivePollingBaseInterval:     10 * time.Second,
		AdaptivePollingMinInterval:      5 * time.Second,
		AdaptivePollingMaxInterval:      5 * time.Minute,
		GuestMetadataMinRefreshInterval: DefaultGuestMetadataMinRefresh,
		GuestMetadataRefreshJitter:      DefaultGuestMetadataRefreshJitter,
		GuestMetadataRetryBackoff:       DefaultGuestMetadataRetryBackoff,
		GuestMetadataMaxConcurrent:      DefaultGuestMetadataMaxConcurrent,
		DNSCacheTimeout:                 5 * time.Minute, // Default DNS cache timeout
		LogLevel:                        "info",
		LogFormat:                       "auto",
		LogMaxSize:                      100,
		LogMaxAge:                       30,
		LogCompress:                     true,
		AllowedOrigins:                  "",               // Empty means no CORS headers (same-origin only)
		PBSPollingInterval:              60 * time.Second, // Default PBS polling (slower)
		PMGPollingInterval:              60 * time.Second, // Default PMG polling (aggregated stats)
		DiscoveryEnabled:                false,
		DiscoverySubnet:                 "auto",
		TemperatureMonitoringEnabled:    true,
		TelemetryEnabled:                true,            // Enabled by default; opt out via PULSE_TELEMETRY=false or Settings
		MaxPollTimeout:                  3 * time.Minute, // Default max poll timeout for large clusters
		ProTrialSignupURL:               pkglicensing.DefaultProTrialSignupURL,
		EnvOverrides:                    make(map[string]bool),
		AgentConnectURL:                 "",
		MetricsBindAddress:              "127.0.0.1",
		// Metrics retention defaults (tiered)
		MetricsRetentionRawHours:    2,  // 2 hours of raw ~5s data
		MetricsRetentionMinuteHours: 24, // 24 hours of minute averages
		MetricsRetentionHourlyDays:  7,  // 7 days of hourly averages
		MetricsRetentionDailyDays:   90, // 90 days of daily averages
	}

	cfg.Discovery = DefaultDiscoveryConfig()

	// Initialize persistence
	persistence := NewConfigPersistence(dataDir)
	if persistence != nil {
		// Store global persistence for saving
		globalPersistence = persistence
		// Load nodes configuration
		if nodesConfig, err := persistence.LoadNodesConfig(); err == nil && nodesConfig != nil {
			cfg.PVEInstances = nodesConfig.PVEInstances
			cfg.PBSInstances = nodesConfig.PBSInstances
			cfg.PMGInstances = nodesConfig.PMGInstances
			log.Info().
				Int("pve", len(cfg.PVEInstances)).
				Int("pbs", len(cfg.PBSInstances)).
				Int("pmg", len(cfg.PMGInstances)).
				Msg("Loaded nodes configuration")
		} else if err != nil {
			log.Warn().Err(err).Msg("Failed to load nodes configuration")
		}

		// Load system configuration
		if systemSettings, err := persistence.LoadSystemSettings(); err == nil && systemSettings != nil {
			// Load polling intervals if configured
			if systemSettings.PVEPollingInterval > 0 {
				cfg.PVEPollingInterval = time.Duration(systemSettings.PVEPollingInterval) * time.Second
			}
			if systemSettings.PBSPollingInterval > 0 {
				cfg.PBSPollingInterval = time.Duration(systemSettings.PBSPollingInterval) * time.Second
			}
			if systemSettings.PMGPollingInterval > 0 {
				cfg.PMGPollingInterval = time.Duration(systemSettings.PMGPollingInterval) * time.Second
			}

			if systemSettings.BackupPollingInterval > 0 {
				cfg.BackupPollingInterval = time.Duration(systemSettings.BackupPollingInterval) * time.Second
			} else if systemSettings.BackupPollingInterval == 0 {
				cfg.BackupPollingInterval = 0
			}
			if systemSettings.BackupPollingEnabled != nil {
				cfg.EnableBackupPolling = *systemSettings.BackupPollingEnabled
			}
			if systemSettings.AdaptivePollingEnabled != nil {
				cfg.AdaptivePollingEnabled = *systemSettings.AdaptivePollingEnabled
			}
			if systemSettings.AdaptivePollingBaseInterval > 0 {
				cfg.AdaptivePollingBaseInterval = time.Duration(systemSettings.AdaptivePollingBaseInterval) * time.Second
			}
			if systemSettings.AdaptivePollingMinInterval > 0 {
				cfg.AdaptivePollingMinInterval = time.Duration(systemSettings.AdaptivePollingMinInterval) * time.Second
			}
			if systemSettings.AdaptivePollingMaxInterval > 0 {
				cfg.AdaptivePollingMaxInterval = time.Duration(systemSettings.AdaptivePollingMaxInterval) * time.Second
			}

			cfg.UpdateChannel = EffectiveUpdateChannel(systemSettings.UpdateChannel, cfg.UpdateChannel)
			cfg.AutoUpdateEnabled = EffectiveAutoUpdateEnabled(cfg.UpdateChannel, systemSettings.AutoUpdateEnabled)
			if systemSettings.AutoUpdateCheckInterval > 0 {
				cfg.AutoUpdateCheckInterval = time.Duration(systemSettings.AutoUpdateCheckInterval) * time.Hour
			}
			if systemSettings.AutoUpdateTime != "" {
				cfg.AutoUpdateTime = systemSettings.AutoUpdateTime
			}
			if systemSettings.AllowedOrigins != "" {
				cfg.AllowedOrigins = systemSettings.AllowedOrigins
			}
			if systemSettings.ConnectionTimeout > 0 {
				cfg.ConnectionTimeout = time.Duration(systemSettings.ConnectionTimeout) * time.Second
			}
			if systemSettings.LogLevel != "" {
				cfg.LogLevel = systemSettings.LogLevel
			}
			// Always load DiscoveryEnabled even if false
			cfg.DiscoveryEnabled = systemSettings.DiscoveryEnabled
			if systemSettings.DiscoverySubnet != "" {
				cfg.DiscoverySubnet = systemSettings.DiscoverySubnet
			}
			cfg.Discovery = NormalizeDiscoveryConfig(CloneDiscoveryConfig(systemSettings.DiscoveryConfig))
			cfg.TemperatureMonitoringEnabled = systemSettings.TemperatureMonitoringEnabled
			// Load DNS cache timeout
			if systemSettings.DNSCacheTimeout > 0 {
				cfg.DNSCacheTimeout = time.Duration(systemSettings.DNSCacheTimeout) * time.Second
			}
			// Load SSH port
			if systemSettings.SSHPort > 0 {
				cfg.SSHPort = systemSettings.SSHPort
			} else {
				cfg.SSHPort = 22 // Default SSH port
			}
			// Load HideLocalLogin
			cfg.HideLocalLogin = systemSettings.HideLocalLogin
			// Load DisableDockerUpdateActions (hide Docker update buttons)
			cfg.DisableDockerUpdateActions = systemSettings.DisableDockerUpdateActions
			// Load TelemetryEnabled (enabled by default; nil means true for upgrading users)
			if systemSettings.TelemetryEnabled != nil {
				cfg.TelemetryEnabled = *systemSettings.TelemetryEnabled
			} else {
				cfg.TelemetryEnabled = true // default: enabled
			}
			// Load PublicURL from settings (will be overridden by env var if set)
			if systemSettings.PublicURL != "" {
				cfg.PublicURL = systemSettings.PublicURL
			}

			// Load metrics retention settings (only override if explicitly set)
			if systemSettings.MetricsRetentionRawHours > 0 {
				cfg.MetricsRetentionRawHours = systemSettings.MetricsRetentionRawHours
			}
			if systemSettings.MetricsRetentionMinuteHours > 0 {
				cfg.MetricsRetentionMinuteHours = systemSettings.MetricsRetentionMinuteHours
			}
			if systemSettings.MetricsRetentionHourlyDays > 0 {
				cfg.MetricsRetentionHourlyDays = systemSettings.MetricsRetentionHourlyDays
			}
			if systemSettings.MetricsRetentionDailyDays > 0 {
				cfg.MetricsRetentionDailyDays = systemSettings.MetricsRetentionDailyDays
			}

			// APIToken is not loaded from system.json; it is kept in sync from APITokens.
			log.Info().
				Str("updateChannel", cfg.UpdateChannel).
				Str("logLevel", cfg.LogLevel).
				Dur("dnsCacheTimeout", cfg.DNSCacheTimeout).
				Int("metricsRetentionDailyDays", cfg.MetricsRetentionDailyDays).
				Msg("Loaded system configuration")
		} else {
			// No system.json exists - create default one
			log.Info().Msg("No system.json found, creating default")
			defaultSettings := DefaultSystemSettings()
			defaultSettings.ConnectionTimeout = int(cfg.ConnectionTimeout.Seconds())
			if err := persistence.SaveSystemSettings(*defaultSettings); err != nil {
				log.Warn().Err(err).Msg("Failed to create default system.json")
			}
		}

	}

	// Load API tokens
	if tokens, err := persistence.LoadAPITokens(); err == nil {
		if migrated := bindMissingAPITokenIDs(tokens); migrated > 0 {
			if err := persistence.SaveAPITokens(tokens); err != nil {
				log.Error().Err(err).Int("count", migrated).Msg("Failed to persist API token ID migration")
			} else {
				log.Warn().Int("count", migrated).Msg("Migrated API tokens missing IDs")
			}
		}
		if migrated := bindLegacyAPITokensToDefault(tokens); migrated > 0 {
			if err := persistence.SaveAPITokens(tokens); err != nil {
				log.Error().Err(err).Int("count", migrated).Msg("Failed to persist legacy API token org binding migration")
			} else {
				log.Warn().Int("count", migrated).Msg("Migrated legacy API tokens to default organization binding")
			}
		}
		cfg.APITokens = tokens
		cfg.SortAPITokens()
		log.Info().Int("count", len(tokens)).Msg("Loaded API tokens from persistence")
	} else {
		log.Warn().Err(err).Msg("Failed to load API tokens from persistence")
	}

	// Ensure polling intervals have sane defaults if not set
	if cfg.PVEPollingInterval <= 0 {
		cfg.PVEPollingInterval = 10 * time.Second
	}
	if cfg.PVEPollingInterval > time.Hour {
		cfg.PVEPollingInterval = time.Hour
	}
	if cfg.PBSPollingInterval == 0 {
		cfg.PBSPollingInterval = 60 * time.Second
	}
	if cfg.PMGPollingInterval == 0 {
		cfg.PMGPollingInterval = 60 * time.Second
	}

	// Limited environment variable support
	// NOTE: Node configuration is NOT done via env vars - use the web UI instead

	if cyclesStr := utils.GetenvTrim("BACKUP_POLLING_CYCLES"); cyclesStr != "" {
		if cycles, err := strconv.Atoi(cyclesStr); err == nil {
			if cycles < 0 {
				log.Warn().Str("value", cyclesStr).Msg("Ignoring negative BACKUP_POLLING_CYCLES from environment")
			} else {
				cfg.BackupPollingCycles = cycles
				cfg.EnvOverrides["BACKUP_POLLING_CYCLES"] = true
				log.Info().Int("cycles", cycles).Msg("Overriding backup polling cycles from environment")
			}
		} else {
			log.Warn().Str("value", cyclesStr).Msg("Invalid BACKUP_POLLING_CYCLES value, ignoring")
		}
	}

	if intervalStr := utils.GetenvTrim("BACKUP_POLLING_INTERVAL"); intervalStr != "" {
		if dur, err := time.ParseDuration(intervalStr); err == nil {
			if dur < 0 {
				log.Warn().Str("value", intervalStr).Msg("Ignoring negative BACKUP_POLLING_INTERVAL from environment")
			} else {
				cfg.BackupPollingInterval = dur
				cfg.EnvOverrides["BACKUP_POLLING_INTERVAL"] = true
				log.Info().Dur("interval", dur).Msg("Overriding backup polling interval from environment")
			}
		} else if seconds, err := strconv.Atoi(intervalStr); err == nil {
			if seconds < 0 {
				log.Warn().Str("value", intervalStr).Msg("Ignoring negative BACKUP_POLLING_INTERVAL (seconds) from environment")
			} else {
				cfg.BackupPollingInterval = time.Duration(seconds) * time.Second
				cfg.EnvOverrides["BACKUP_POLLING_INTERVAL"] = true
				log.Info().Int("seconds", seconds).Msg("Overriding backup polling interval (seconds) from environment")
			}
		} else {
			log.Warn().Str("value", intervalStr).Msg("Invalid BACKUP_POLLING_INTERVAL value, expected duration or seconds")
		}
	}

	if dur, ok := parsePollingIntervalEnv("PVE_POLLING_INTERVAL", 10*time.Second); ok {
		cfg.PVEPollingInterval = dur
		cfg.EnvOverrides["PVE_POLLING_INTERVAL"] = true
	}

	if dur, ok := parsePollingIntervalEnv("PBS_POLLING_INTERVAL", 10*time.Second); ok {
		cfg.PBSPollingInterval = dur
		cfg.EnvOverrides["PBS_POLLING_INTERVAL"] = true
	}

	if dur, ok := parsePollingIntervalEnv("PMG_POLLING_INTERVAL", 10*time.Second); ok {
		cfg.PMGPollingInterval = dur
		cfg.EnvOverrides["PMG_POLLING_INTERVAL"] = true
	}

	if enabledStr := utils.GetenvTrim("ENABLE_TEMPERATURE_MONITORING"); enabledStr != "" {
		if enabled, err := strconv.ParseBool(enabledStr); err == nil {
			cfg.TemperatureMonitoringEnabled = enabled
			cfg.EnvOverrides["temperatureMonitoringEnabled"] = true
			log.Info().
				Bool("enabled", enabled).
				Msg("Overriding temperature monitoring setting from environment")
		} else {
			log.Warn().
				Str("value", enabledStr).
				Msg("Invalid ENABLE_TEMPERATURE_MONITORING value, ignoring")
		}
	}

	if hideLocalLoginStr := utils.GetenvTrim("PULSE_AUTH_HIDE_LOCAL_LOGIN"); hideLocalLoginStr != "" {
		if hide, err := strconv.ParseBool(hideLocalLoginStr); err == nil {
			cfg.HideLocalLogin = hide
			cfg.EnvOverrides["PULSE_AUTH_HIDE_LOCAL_LOGIN"] = true
			log.Info().Bool("hide", hide).Msg("Overriding hide local login setting from environment")
		} else {
			log.Warn().Str("value", hideLocalLoginStr).Msg("Invalid PULSE_AUTH_HIDE_LOCAL_LOGIN value, ignoring")
		}
	}

	if disableDockerUpdateActionsStr := utils.GetenvTrim("PULSE_DISABLE_DOCKER_UPDATE_ACTIONS"); disableDockerUpdateActionsStr != "" {
		if disabled, err := strconv.ParseBool(disableDockerUpdateActionsStr); err == nil {
			cfg.DisableDockerUpdateActions = disabled
			cfg.EnvOverrides["PULSE_DISABLE_DOCKER_UPDATE_ACTIONS"] = true
			cfg.EnvOverrides["disableDockerUpdateActions"] = true
			log.Info().Bool("disabled", disabled).Msg("Overriding Docker update actions setting from environment")
		} else {
			log.Warn().
				Str("value", disableDockerUpdateActionsStr).
				Msg("Invalid PULSE_DISABLE_DOCKER_UPDATE_ACTIONS value, ignoring")
		}
	}

	if guestDockerDetectionStr := utils.GetenvTrim("PULSE_ENABLE_PROXMOX_GUEST_DOCKER_DETECTION"); guestDockerDetectionStr != "" {
		if enabled, err := strconv.ParseBool(guestDockerDetectionStr); err == nil {
			cfg.EnableProxmoxGuestDockerDetection = enabled
			cfg.EnvOverrides["PULSE_ENABLE_PROXMOX_GUEST_DOCKER_DETECTION"] = true
			log.Info().Bool("enabled", enabled).Msg("Overriding Proxmox guest Docker detection setting from environment")
		} else {
			log.Warn().
				Str("value", guestDockerDetectionStr).
				Msg("Invalid PULSE_ENABLE_PROXMOX_GUEST_DOCKER_DETECTION value, ignoring")
		}
	}

	if guestDockerInventoryStr := utils.GetenvTrim("PULSE_ENABLE_PROXMOX_GUEST_DOCKER_INVENTORY"); guestDockerInventoryStr != "" {
		if enabled, err := strconv.ParseBool(guestDockerInventoryStr); err == nil {
			cfg.EnableProxmoxGuestDockerInventory = enabled
			cfg.EnvOverrides["PULSE_ENABLE_PROXMOX_GUEST_DOCKER_INVENTORY"] = true
			log.Info().Bool("enabled", enabled).Msg("Overriding Proxmox guest Docker inventory setting from environment")
		} else {
			log.Warn().
				Str("value", guestDockerInventoryStr).
				Msg("Invalid PULSE_ENABLE_PROXMOX_GUEST_DOCKER_INVENTORY value, ignoring")
		}
	}

	if guestDockerInventoryVMIDs := utils.GetenvTrim("PULSE_PROXMOX_GUEST_DOCKER_INVENTORY_VMIDS"); guestDockerInventoryVMIDs != "" {
		cfg.ProxmoxGuestDockerInventoryVMIDs = guestDockerInventoryVMIDs
		cfg.EnvOverrides["PULSE_PROXMOX_GUEST_DOCKER_INVENTORY_VMIDS"] = true
		log.Info().Str("vmids", guestDockerInventoryVMIDs).Msg("Overriding Proxmox guest Docker inventory VMID allowlist from environment")
	}

	if telemetryStr := utils.GetenvTrim("PULSE_TELEMETRY"); telemetryStr != "" {
		if enabled, err := strconv.ParseBool(telemetryStr); err == nil {
			cfg.TelemetryEnabled = enabled
			cfg.EnvOverrides["PULSE_TELEMETRY"] = true
			cfg.EnvOverrides["telemetryEnabled"] = true
			log.Info().Bool("enabled", enabled).Msg("Overriding outbound usage telemetry setting from environment")
		} else {
			log.Warn().Str("value", telemetryStr).Msg("Invalid PULSE_TELEMETRY value, ignoring")
		}
	}
	if trialSignupURL := utils.GetenvTrim(pkglicensing.ProTrialSignupURLEnvVar); trialSignupURL != "" {
		resolved := pkglicensing.ResolveProTrialSignupURL(trialSignupURL)
		if resolved != pkglicensing.DefaultProTrialSignupURL {
			cfg.ProTrialSignupURL = resolved
			cfg.EnvOverrides[pkglicensing.ProTrialSignupURLEnvVar] = true
			cfg.EnvOverrides["proTrialSignupURL"] = true
			log.Info().Str("url", resolved).Msg("Overriding hosted commercial base URL from environment")
		} else {
			log.Warn().Str("value", trialSignupURL).Msg("Invalid PULSE_PRO_TRIAL_SIGNUP_URL value, ignoring")
		}
	}

	if enabledStr := utils.GetenvTrim("ENABLE_BACKUP_POLLING"); enabledStr != "" {
		switch strings.ToLower(enabledStr) {
		case "0", "false", "no", "off":
			cfg.EnableBackupPolling = false
		default:
			cfg.EnableBackupPolling = true
		}
		cfg.EnvOverrides["ENABLE_BACKUP_POLLING"] = true
		log.Info().Bool("enabled", cfg.EnableBackupPolling).Msg("Overriding backup polling enabled flag from environment")
	}

	if adaptiveEnabled := utils.GetenvTrim("ADAPTIVE_POLLING_ENABLED"); adaptiveEnabled != "" {
		switch strings.ToLower(adaptiveEnabled) {
		case "0", "false", "no", "off":
			cfg.AdaptivePollingEnabled = false
		default:
			cfg.AdaptivePollingEnabled = true
		}
		cfg.EnvOverrides["ADAPTIVE_POLLING_ENABLED"] = true
		log.Info().Bool("enabled", cfg.AdaptivePollingEnabled).Msg("Adaptive polling feature flag overridden by environment")
	}

	if baseInterval := utils.GetenvTrim("ADAPTIVE_POLLING_BASE_INTERVAL"); baseInterval != "" {
		if dur, err := time.ParseDuration(baseInterval); err == nil {
			if dur <= 0 {
				log.Warn().Str("value", baseInterval).Msg("Ignoring non-positive ADAPTIVE_POLLING_BASE_INTERVAL from environment")
			} else {
				cfg.AdaptivePollingBaseInterval = dur
				cfg.EnvOverrides["ADAPTIVE_POLLING_BASE_INTERVAL"] = true
				log.Info().Dur("interval", dur).Msg("Adaptive polling base interval overridden by environment")
			}
		} else {
			log.Warn().Str("value", baseInterval).Msg("Invalid ADAPTIVE_POLLING_BASE_INTERVAL value, expected duration string")
		}
	}

	if minInterval := utils.GetenvTrim("ADAPTIVE_POLLING_MIN_INTERVAL"); minInterval != "" {
		if dur, err := time.ParseDuration(minInterval); err == nil {
			if dur <= 0 {
				log.Warn().Str("value", minInterval).Msg("Ignoring non-positive ADAPTIVE_POLLING_MIN_INTERVAL from environment")
			} else {
				cfg.AdaptivePollingMinInterval = dur
				cfg.EnvOverrides["ADAPTIVE_POLLING_MIN_INTERVAL"] = true
				log.Info().Dur("interval", dur).Msg("Adaptive polling min interval overridden by environment")
			}
		} else {
			log.Warn().Str("value", minInterval).Msg("Invalid ADAPTIVE_POLLING_MIN_INTERVAL value, expected duration string")
		}
	}

	if maxInterval := utils.GetenvTrim("ADAPTIVE_POLLING_MAX_INTERVAL"); maxInterval != "" {
		if dur, err := time.ParseDuration(maxInterval); err == nil {
			if dur <= 0 {
				log.Warn().Str("value", maxInterval).Msg("Ignoring non-positive ADAPTIVE_POLLING_MAX_INTERVAL from environment")
			} else {
				cfg.AdaptivePollingMaxInterval = dur
				cfg.EnvOverrides["ADAPTIVE_POLLING_MAX_INTERVAL"] = true
				log.Info().Dur("interval", dur).Msg("Adaptive polling max interval overridden by environment")
			}
		} else {
			log.Warn().Str("value", maxInterval).Msg("Invalid ADAPTIVE_POLLING_MAX_INTERVAL value, expected duration string")
		}
	}

	if minRefresh := utils.GetenvTrim("GUEST_METADATA_MIN_REFRESH_INTERVAL"); minRefresh != "" {
		if dur, err := time.ParseDuration(minRefresh); err == nil {
			if dur <= 0 {
				log.Warn().Str("value", minRefresh).Msg("Ignoring non-positive GUEST_METADATA_MIN_REFRESH_INTERVAL from environment")
			} else {
				cfg.GuestMetadataMinRefreshInterval = dur
				cfg.EnvOverrides["GUEST_METADATA_MIN_REFRESH_INTERVAL"] = true
				log.Info().Dur("interval", dur).Msg("Guest metadata min refresh interval overridden by environment")
			}
		} else {
			log.Warn().Str("value", minRefresh).Msg("Invalid GUEST_METADATA_MIN_REFRESH_INTERVAL value, expected duration string")
		}
	}

	if jitter := utils.GetenvTrim("GUEST_METADATA_REFRESH_JITTER"); jitter != "" {
		if dur, err := time.ParseDuration(jitter); err == nil {
			if dur < 0 {
				log.Warn().Str("value", jitter).Msg("Ignoring negative GUEST_METADATA_REFRESH_JITTER from environment")
			} else {
				cfg.GuestMetadataRefreshJitter = dur
				cfg.EnvOverrides["GUEST_METADATA_REFRESH_JITTER"] = true
				log.Info().Dur("jitter", dur).Msg("Guest metadata refresh jitter overridden by environment")
			}
		} else {
			log.Warn().Str("value", jitter).Msg("Invalid GUEST_METADATA_REFRESH_JITTER value, expected duration string")
		}
	}

	if backoff := utils.GetenvTrim("GUEST_METADATA_RETRY_BACKOFF"); backoff != "" {
		if dur, err := time.ParseDuration(backoff); err == nil {
			if dur <= 0 {
				log.Warn().Str("value", backoff).Msg("Ignoring non-positive GUEST_METADATA_RETRY_BACKOFF from environment")
			} else {
				cfg.GuestMetadataRetryBackoff = dur
				cfg.EnvOverrides["GUEST_METADATA_RETRY_BACKOFF"] = true
				log.Info().Dur("backoff", dur).Msg("Guest metadata retry backoff overridden by environment")
			}
		} else {
			log.Warn().Str("value", backoff).Msg("Invalid GUEST_METADATA_RETRY_BACKOFF value, expected duration string")
		}
	}

	if concurrent := utils.GetenvTrim("GUEST_METADATA_MAX_CONCURRENT"); concurrent != "" {
		if val, err := strconv.Atoi(concurrent); err == nil {
			if val <= 0 {
				log.Warn().Str("value", concurrent).Msg("Ignoring non-positive GUEST_METADATA_MAX_CONCURRENT from environment")
			} else {
				cfg.GuestMetadataMaxConcurrent = val
				cfg.EnvOverrides["GUEST_METADATA_MAX_CONCURRENT"] = true
				log.Info().Int("maxConcurrent", val).Msg("Guest metadata max concurrency overridden by environment")
			}
		} else {
			log.Warn().Str("value", concurrent).Msg("Invalid GUEST_METADATA_MAX_CONCURRENT value, expected integer")
		}
	}

	if dnsCacheTimeout := utils.GetenvTrim("DNS_CACHE_TIMEOUT"); dnsCacheTimeout != "" {
		if dur, err := time.ParseDuration(dnsCacheTimeout); err == nil {
			if dur <= 0 {
				log.Warn().Str("value", dnsCacheTimeout).Msg("Ignoring non-positive DNS_CACHE_TIMEOUT from environment")
			} else {
				cfg.DNSCacheTimeout = dur
				cfg.EnvOverrides["DNS_CACHE_TIMEOUT"] = true
				log.Info().Dur("timeout", dur).Msg("DNS cache timeout overridden by environment")
			}
		} else {
			log.Warn().Str("value", dnsCacheTimeout).Msg("Invalid DNS_CACHE_TIMEOUT value, expected duration string")
		}
	}

	// HTTPS Configuration
	if httpsEnabled := utils.GetenvTrim("HTTPS_ENABLED"); httpsEnabled != "" {
		if enabled, err := strconv.ParseBool(httpsEnabled); err == nil {
			cfg.HTTPSEnabled = enabled
			cfg.EnvOverrides["HTTPS_ENABLED"] = true
			log.Info().Bool("enabled", enabled).Msg("HTTPS enabled override from environment")
		} else {
			log.Warn().Str("value", httpsEnabled).Msg("Invalid HTTPS_ENABLED value, ignoring")
		}
	}

	if certFile := utils.GetenvTrim("TLS_CERT_FILE"); certFile != "" {
		cfg.TLSCertFile = certFile
		cfg.EnvOverrides["TLS_CERT_FILE"] = true
	}

	if keyFile := utils.GetenvTrim("TLS_KEY_FILE"); keyFile != "" {
		cfg.TLSKeyFile = keyFile
		cfg.EnvOverrides["TLS_KEY_FILE"] = true
	}

	if allowedOrigins := utils.GetenvTrim("ALLOWED_ORIGINS"); allowedOrigins != "" {
		cfg.AllowedOrigins = allowedOrigins
		cfg.EnvOverrides["ALLOWED_ORIGINS"] = true
	}

	if bindAddr := utils.GetenvTrim("BIND_ADDRESS"); bindAddr != "" {
		cfg.BindAddress = bindAddr
		cfg.EnvOverrides["BIND_ADDRESS"] = true
	}

	if sshPort := utils.GetenvTrim("SSH_PORT"); sshPort != "" {
		if port, err := strconv.Atoi(sshPort); err == nil {
			if port <= 0 || port > 65535 {
				log.Warn().Str("value", sshPort).Msg("Ignoring invalid SSH_PORT from environment (must be 1-65535)")
			} else {
				cfg.SSHPort = port
				cfg.EnvOverrides["SSH_PORT"] = true
				log.Info().Int("port", port).Msg("SSH port overridden by environment")
			}
		} else {
			log.Warn().Str("value", sshPort).Msg("Invalid SSH_PORT value, expected integer")
		}
	}

	if frontendPort := utils.GetenvTrim("FRONTEND_PORT"); frontendPort != "" {
		if p, err := parsePortOverride("FRONTEND_PORT", frontendPort); err == nil {
			cfg.FrontendPort = p
			cfg.EnvOverrides["FRONTEND_PORT"] = true
			log.Info().Int("port", p).Msg("Overriding frontend port from FRONTEND_PORT env var")
		} else {
			log.Warn().Str("value", frontendPort).Msg("Ignoring invalid FRONTEND_PORT from environment")
		}
	} else if legacyPort := utils.GetenvTrim("PORT"); legacyPort != "" {
		// v5 honored PORT as a documented alias for FRONTEND_PORT; keep it as a
		// lowest-precedence fallback so upgraded installs stay reachable.
		if p, err := parsePortOverride("PORT", legacyPort); err == nil {
			cfg.FrontendPort = p
			cfg.EnvOverrides["FRONTEND_PORT"] = true
			log.Warn().Int("port", p).Msg("Overriding frontend port from legacy PORT env var. PORT is deprecated; set FRONTEND_PORT instead")
		} else {
			log.Warn().Str("value", legacyPort).Msg("Ignoring invalid legacy PORT from environment")
		}
	}

	if agentIngestPort := utils.GetenvTrim("PULSE_AGENT_INGEST_PORT"); agentIngestPort != "" {
		if p, err := parsePortOverride("PULSE_AGENT_INGEST_PORT", agentIngestPort); err == nil {
			cfg.AgentIngestPort = p
			cfg.EnvOverrides["PULSE_AGENT_INGEST_PORT"] = true
			log.Info().Int("port", p).Msg("Serving agent ingest on dedicated port from PULSE_AGENT_INGEST_PORT env var")
		} else {
			log.Warn().Str("value", agentIngestPort).Msg("Ignoring invalid PULSE_AGENT_INGEST_PORT from environment")
		}
	}

	// Detect deprecated DISABLE_AUTH flag and strip it from the runtime env so downstream
	// components behave as if it were never set.
	if disableAuthEnv := os.Getenv("DISABLE_AUTH"); disableAuthEnv != "" {
		if err := os.Unsetenv("DISABLE_AUTH"); err != nil {
			log.Warn().
				Str("DISABLE_AUTH", disableAuthEnv).
				Err(err).
				Msg("Failed to remove legacy DISABLE_AUTH environment variable; continuing with authentication enabled")
		} else {
			log.Warn().
				Str("DISABLE_AUTH", disableAuthEnv).
				Msg("Removed legacy DISABLE_AUTH environment variable. Authentication remains enabled.")
		}
	}

	// Check if demo mode is enabled
	demoModeEnv := os.Getenv("DEMO_MODE")
	if demoModeEnv != "" {
		cfg.DemoMode = demoModeEnv == "true" || demoModeEnv == "1"
		if cfg.DemoMode {
			log.Warn().Msg("DEMO MODE - All modifications disabled (read-only)")
		}
	}

	// Load proxy authentication settings
	if proxyAuthSecret := os.Getenv("PROXY_AUTH_SECRET"); proxyAuthSecret != "" {
		cfg.ProxyAuthSecret = proxyAuthSecret
		log.Info().Msg("Proxy authentication secret configured")

		// Load other proxy auth settings
		if userHeader := os.Getenv("PROXY_AUTH_USER_HEADER"); userHeader != "" {
			cfg.ProxyAuthUserHeader = userHeader
			log.Info().Str("header", userHeader).Msg("Proxy auth user header configured")
		}
		if roleHeader := os.Getenv("PROXY_AUTH_ROLE_HEADER"); roleHeader != "" {
			cfg.ProxyAuthRoleHeader = roleHeader
			log.Info().Str("header", roleHeader).Msg("Proxy auth role header configured")
		}
		if roleSeparator := os.Getenv("PROXY_AUTH_ROLE_SEPARATOR"); roleSeparator != "" {
			cfg.ProxyAuthRoleSeparator = roleSeparator
			log.Info().Str("separator", roleSeparator).Msg("Proxy auth role separator configured")
		}
		if adminRole := os.Getenv("PROXY_AUTH_ADMIN_ROLE"); adminRole != "" {
			cfg.ProxyAuthAdminRole = adminRole
			log.Info().Str("role", adminRole).Msg("Proxy auth admin role configured")
		}
		if logoutURL := os.Getenv("PROXY_AUTH_LOGOUT_URL"); logoutURL != "" {
			cfg.ProxyAuthLogoutURL = logoutURL
			log.Info().Str("url", logoutURL).Msg("Proxy auth logout URL configured")
		}
	}

	if authUser := os.Getenv("PULSE_AUTH_USER"); authUser != "" {
		cfg.AuthUser = authUser
		log.Info().Msg("Overriding auth user from env var")
	}
	if authPass := os.Getenv("PULSE_AUTH_PASS"); authPass != "" {
		normalizedAuthPass, err := normalizeEnvAuthPassword(authPass)
		if err != nil {
			return nil, err
		}
		cfg.AuthPass = normalizedAuthPass
		if !IsPasswordHashed(strings.Trim(authPass, "'\"")) {
			log.Info().Msg("Auto-hashed plain text password from environment variable")
		} else {
			log.Debug().Msg("Loaded pre-hashed password from env var")
		}
	}

	// HTTPS/TLS configuration from environment
	if httpsEnabled := os.Getenv("HTTPS_ENABLED"); httpsEnabled != "" {
		cfg.HTTPSEnabled = httpsEnabled == "true" || httpsEnabled == "1"
		log.Debug().Bool("enabled", cfg.HTTPSEnabled).Msg("HTTPS enabled status from env var")
	}
	if tlsCertFile := os.Getenv("TLS_CERT_FILE"); tlsCertFile != "" {
		cfg.TLSCertFile = tlsCertFile
		log.Debug().Str("cert_file", tlsCertFile).Msg("TLS cert file from env var")
	}
	if tlsKeyFile := os.Getenv("TLS_KEY_FILE"); tlsKeyFile != "" {
		cfg.TLSKeyFile = tlsKeyFile
		log.Debug().Str("key_file", tlsKeyFile).Msg("TLS key file from env var")
	}
	if redirectPort := os.Getenv("HTTP_REDIRECT_PORT"); redirectPort != "" {
		if p, err := strconv.Atoi(redirectPort); err == nil && p > 0 && p <= 65535 {
			cfg.HTTPRedirectPort = p
			cfg.EnvOverrides["HTTP_REDIRECT_PORT"] = true
			log.Debug().Int("port", p).Msg("HTTP redirect port from env var")
		}
	}

	if metricsToken := utils.GetenvTrim("PULSE_METRICS_TOKEN"); metricsToken != "" {
		cfg.MetricsToken = metricsToken
		cfg.EnvOverrides["PULSE_METRICS_TOKEN"] = true
		log.Debug().Msg("Metrics token configured from env var")
	}
	if metricsBindAddress := utils.GetenvTrim("PULSE_METRICS_BIND_ADDRESS"); metricsBindAddress != "" {
		cfg.MetricsBindAddress = metricsBindAddress
		cfg.EnvOverrides["PULSE_METRICS_BIND_ADDRESS"] = true
		log.Info().Str("bind_address", metricsBindAddress).Msg("Metrics bind address overridden by environment")
	}
	if allowInsecureRemote := utils.GetenvTrim("PULSE_METRICS_ALLOW_INSECURE_REMOTE"); allowInsecureRemote != "" {
		if enabled, err := strconv.ParseBool(allowInsecureRemote); err == nil {
			cfg.MetricsAllowInsecureRemote = enabled
			cfg.EnvOverrides["PULSE_METRICS_ALLOW_INSECURE_REMOTE"] = true
			log.Warn().Bool("enabled", enabled).Msg("Metrics insecure remote scrape override configured")
		} else {
			log.Warn().Str("value", allowInsecureRemote).Msg("Invalid PULSE_METRICS_ALLOW_INSECURE_REMOTE value, ignoring")
		}
	}
	if metricsDBPath := utils.GetenvTrim("PULSE_METRICS_DB_PATH"); metricsDBPath != "" {
		cfg.MetricsDBPath = metricsDBPath
		cfg.EnvOverrides["PULSE_METRICS_DB_PATH"] = true
		log.Info().Str("path", metricsDBPath).Msg("Metrics database path overridden by environment")
	}
	if dur, ok := parseDurationOverrideEnv("PULSE_METRICS_ROLLUP_INTERVAL", 5*time.Minute); ok {
		cfg.MetricsRollupInterval = dur
		cfg.EnvOverrides["PULSE_METRICS_ROLLUP_INTERVAL"] = true
		log.Info().Dur("interval", dur).Msg("Metrics rollup interval overridden by environment")
	}

	// Support PULSE_AGENT_URL as an alias for PULSE_AGENT_CONNECT_URL
	// (Check this first so standard PULSE_AGENT_CONNECT_URL takes precedence if both set)
	if agentURL := utils.GetenvTrim("PULSE_AGENT_URL"); agentURL != "" {
		cfg.AgentConnectURL = agentURL
		cfg.EnvOverrides["PULSE_AGENT_CONNECT_URL"] = true
		log.Info().Str("url", agentURL).Msg("Using dedicated agent connect URL from PULSE_AGENT_URL")
	}

	if agentConnectURL := utils.GetenvTrim("PULSE_AGENT_CONNECT_URL"); agentConnectURL != "" {
		cfg.AgentConnectURL = agentConnectURL
		cfg.EnvOverrides["PULSE_AGENT_CONNECT_URL"] = true
		log.Info().Str("url", agentConnectURL).Msg("Using dedicated agent connect URL from environment")
	}

	// Update settings are system.json-only; legacy env vars remain ignored.

	// Normalize PVE user fields for password authentication
	for i := range cfg.PVEInstances {
		if cfg.PVEInstances[i].TokenName == "" && cfg.PVEInstances[i].TokenValue == "" && cfg.PVEInstances[i].User != "" && !strings.Contains(cfg.PVEInstances[i].User, "@") {
			cfg.PVEInstances[i].User = cfg.PVEInstances[i].User + "@pam"
		}
	}

	if cfg.AllowedOrigins == "" {
		// If not configured and we're in development mode (different ports for frontend/backend)
		// allow localhost for development convenience
		if os.Getenv("NODE_ENV") == "development" || os.Getenv("PULSE_DEV") == "true" {
			cfg.AllowedOrigins = "http://localhost:5173,http://localhost:7655"
			log.Info().Msg("Development mode: allowing localhost origins")
		}
	}
	// Support env vars for important settings (override system.json)
	// NOTE: Environment variables always take precedence over UI/system.json settings
	if discoveryEnabled := os.Getenv("DISCOVERY_ENABLED"); discoveryEnabled != "" {
		cfg.DiscoveryEnabled = discoveryEnabled == "true" || discoveryEnabled == "1"
		cfg.EnvOverrides["discoveryEnabled"] = true
		log.Info().Bool("enabled", cfg.DiscoveryEnabled).Msg("Discovery enabled overridden by DISCOVERY_ENABLED env var")
	}
	if discoverySubnet := os.Getenv("DISCOVERY_SUBNET"); discoverySubnet != "" {
		cfg.DiscoverySubnet = discoverySubnet
		cfg.EnvOverrides["discoverySubnet"] = true
		log.Info().Str("subnet", discoverySubnet).Msg("Discovery subnet overridden by DISCOVERY_SUBNET env var")
	}
	if envOverride := utils.GetenvTrim("DISCOVERY_ENVIRONMENT_OVERRIDE"); envOverride != "" {
		if canonicalEnv, ok := CanonicalDiscoveryEnvironment(envOverride); ok {
			cfg.Discovery.EnvironmentOverride = canonicalEnv
			cfg.EnvOverrides["discoveryEnvironmentOverride"] = true
			log.Info().Str("environment", cfg.Discovery.EnvironmentOverride).Msg("Discovery environment override set by DISCOVERY_ENVIRONMENT_OVERRIDE")
		} else {
			log.Warn().Str("value", envOverride).Msg("Ignoring invalid DISCOVERY_ENVIRONMENT_OVERRIDE value")
		}
	}
	if allowlistEnv := utils.GetenvTrim("DISCOVERY_SUBNET_ALLOWLIST"); allowlistEnv != "" {
		parts := splitAndTrim(allowlistEnv)
		cfg.Discovery.SubnetAllowlist = sanitizeCIDRList(parts)
		cfg.EnvOverrides["discoverySubnetAllowlist"] = true
		log.Info().Int("allowlistCount", len(cfg.Discovery.SubnetAllowlist)).Msg("Discovery subnet allowlist overridden by DISCOVERY_SUBNET_ALLOWLIST")
	}
	if blocklistEnv := utils.GetenvTrim("DISCOVERY_SUBNET_BLOCKLIST"); blocklistEnv != "" {
		parts := splitAndTrim(blocklistEnv)
		cfg.Discovery.SubnetBlocklist = sanitizeCIDRList(parts)
		cfg.EnvOverrides["discoverySubnetBlocklist"] = true
		log.Info().Int("blocklistCount", len(cfg.Discovery.SubnetBlocklist)).Msg("Discovery subnet blocklist overridden by DISCOVERY_SUBNET_BLOCKLIST")
	}
	if maxHostsEnv := utils.GetenvTrim("DISCOVERY_MAX_HOSTS_PER_SCAN"); maxHostsEnv != "" {
		if v, err := strconv.Atoi(maxHostsEnv); err == nil && v > 0 {
			cfg.Discovery.MaxHostsPerScan = v
			cfg.EnvOverrides["discoveryMaxHostsPerScan"] = true
			log.Info().Int("maxHostsPerScan", v).Msg("Discovery max hosts per scan overridden by DISCOVERY_MAX_HOSTS_PER_SCAN")
		} else {
			log.Warn().Str("value", maxHostsEnv).Msg("Ignoring invalid DISCOVERY_MAX_HOSTS_PER_SCAN value")
		}
	}
	if maxConcurrentEnv := utils.GetenvTrim("DISCOVERY_MAX_CONCURRENT"); maxConcurrentEnv != "" {
		if v, err := strconv.Atoi(maxConcurrentEnv); err == nil && v > 0 {
			cfg.Discovery.MaxConcurrent = v
			cfg.EnvOverrides["discoveryMaxConcurrent"] = true
			log.Info().Int("maxConcurrent", v).Msg("Discovery concurrency overridden by DISCOVERY_MAX_CONCURRENT")
		} else {
			log.Warn().Str("value", maxConcurrentEnv).Msg("Ignoring invalid DISCOVERY_MAX_CONCURRENT value")
		}
	}
	if reverseDNSEnv := utils.GetenvTrim("DISCOVERY_ENABLE_REVERSE_DNS"); reverseDNSEnv != "" {
		switch strings.ToLower(reverseDNSEnv) {
		case "0", "false", "no", "off":
			cfg.Discovery.EnableReverseDNS = false
		default:
			cfg.Discovery.EnableReverseDNS = true
		}
		cfg.EnvOverrides["discoveryEnableReverseDns"] = true
		log.Info().Bool("enableReverseDNS", cfg.Discovery.EnableReverseDNS).Msg("Discovery reverse DNS setting overridden by DISCOVERY_ENABLE_REVERSE_DNS")
	}
	if scanGatewaysEnv := utils.GetenvTrim("DISCOVERY_SCAN_GATEWAYS"); scanGatewaysEnv != "" {
		switch strings.ToLower(scanGatewaysEnv) {
		case "0", "false", "no", "off":
			cfg.Discovery.ScanGateways = false
		default:
			cfg.Discovery.ScanGateways = true
		}
		cfg.EnvOverrides["discoveryScanGateways"] = true
		log.Info().Bool("scanGateways", cfg.Discovery.ScanGateways).Msg("Discovery gateway scanning overridden by DISCOVERY_SCAN_GATEWAYS")
	}
	if dialTimeoutEnv := utils.GetenvTrim("DISCOVERY_DIAL_TIMEOUT_MS"); dialTimeoutEnv != "" {
		if v, err := strconv.Atoi(dialTimeoutEnv); err == nil && v > 0 {
			cfg.Discovery.DialTimeout = v
			cfg.EnvOverrides["discoveryDialTimeoutMs"] = true
			log.Info().Int("dialTimeoutMs", v).Msg("Discovery dial timeout overridden by DISCOVERY_DIAL_TIMEOUT_MS")
		} else {
			log.Warn().Str("value", dialTimeoutEnv).Msg("Ignoring invalid DISCOVERY_DIAL_TIMEOUT_MS value")
		}
	}
	if httpTimeoutEnv := utils.GetenvTrim("DISCOVERY_HTTP_TIMEOUT_MS"); httpTimeoutEnv != "" {
		if v, err := strconv.Atoi(httpTimeoutEnv); err == nil && v > 0 {
			cfg.Discovery.HTTPTimeout = v
			cfg.EnvOverrides["discoveryHttpTimeoutMs"] = true
			log.Info().Int("httpTimeoutMs", v).Msg("Discovery HTTP timeout overridden by DISCOVERY_HTTP_TIMEOUT_MS")
		} else {
			log.Warn().Str("value", httpTimeoutEnv).Msg("Ignoring invalid DISCOVERY_HTTP_TIMEOUT_MS value")
		}
	}
	if logLevel := os.Getenv("LOG_LEVEL"); logLevel != "" {
		cfg.LogLevel = logLevel
		cfg.EnvOverrides["logLevel"] = true
		log.Info().Str("level", logLevel).Msg("Log level overridden by LOG_LEVEL env var")
	}
	if logFormat := os.Getenv("LOG_FORMAT"); logFormat != "" {
		cfg.LogFormat = logFormat
		cfg.EnvOverrides["logFormat"] = true
		log.Info().Str("format", logFormat).Msg("Log format overridden by LOG_FORMAT env var")
	}

	if logFile := os.Getenv("LOG_FILE"); logFile != "" {
		cfg.LogFile = logFile
		cfg.EnvOverrides["logFile"] = true
		log.Info().Str("file", logFile).Msg("Log file overridden by LOG_FILE env var")
	}

	if logMaxSize := os.Getenv("LOG_MAX_SIZE"); logMaxSize != "" {
		if size, err := strconv.Atoi(logMaxSize); err == nil {
			if size <= 0 {
				log.Warn().Str("value", logMaxSize).Msg("Ignoring non-positive LOG_MAX_SIZE from environment")
			} else {
				cfg.LogMaxSize = size
				cfg.EnvOverrides["logMaxSize"] = true
				log.Info().Int("size_mb", size).Msg("Log max size overridden by LOG_MAX_SIZE env var")
			}
		} else {
			log.Warn().Str("value", logMaxSize).Msg("Invalid LOG_MAX_SIZE value, expected integer")
		}
	}

	if logMaxAge := os.Getenv("LOG_MAX_AGE"); logMaxAge != "" {
		if age, err := strconv.Atoi(logMaxAge); err == nil {
			if age <= 0 {
				log.Warn().Str("value", logMaxAge).Msg("Ignoring non-positive LOG_MAX_AGE from environment")
			} else {
				cfg.LogMaxAge = age
				cfg.EnvOverrides["logMaxAge"] = true
				log.Info().Int("days", age).Msg("Log max age overridden by LOG_MAX_AGE env var")
			}
		} else {
			log.Warn().Str("value", logMaxAge).Msg("Invalid LOG_MAX_AGE value, expected integer")
		}
	}

	if logCompress := os.Getenv("LOG_COMPRESS"); logCompress != "" {
		cfg.LogCompress = logCompress == "true" || logCompress == "1"
		cfg.EnvOverrides["logCompress"] = true
		log.Info().Bool("compress", cfg.LogCompress).Msg("Log compression overridden by LOG_COMPRESS env var")
	}

	cfg.Discovery = NormalizeDiscoveryConfig(cfg.Discovery)
	if connectionTimeout := utils.GetenvTrim("CONNECTION_TIMEOUT"); connectionTimeout != "" {
		if d, err := parseConnectionTimeoutOverride(connectionTimeout); err == nil {
			if d < time.Second {
				log.Warn().Dur("value", d).Msg("Ignoring CONNECTION_TIMEOUT below 1s from environment")
			} else {
				cfg.ConnectionTimeout = d
				cfg.EnvOverrides["connectionTimeout"] = true
				log.Info().Dur("timeout", d).Msg("Connection timeout overridden by CONNECTION_TIMEOUT env var")
			}
		} else {
			log.Warn().Str("value", connectionTimeout).Msg("Invalid CONNECTION_TIMEOUT value, expected seconds or duration string")
		}
	}
	if maxPollTimeout := os.Getenv("MAX_POLL_TIMEOUT"); maxPollTimeout != "" {
		if d, err := time.ParseDuration(maxPollTimeout); err == nil {
			if d >= 30*time.Second { // Minimum 30 seconds
				cfg.MaxPollTimeout = d
				cfg.EnvOverrides["maxPollTimeout"] = true
				log.Info().Dur("timeout", d).Msg("Max poll timeout overridden by MAX_POLL_TIMEOUT env var")
			} else {
				log.Warn().Dur("value", d).Msg("MAX_POLL_TIMEOUT too low (minimum 30s), using default")
			}
		} else {
			log.Warn().Str("value", maxPollTimeout).Msg("Invalid MAX_POLL_TIMEOUT value, using default")
		}
	}
	if allowedOrigins := os.Getenv("ALLOWED_ORIGINS"); allowedOrigins != "" {
		cfg.AllowedOrigins = allowedOrigins
		cfg.EnvOverrides["allowedOrigins"] = true
		log.Info().Str("origins", allowedOrigins).Msg("Allowed origins overridden by ALLOWED_ORIGINS env var")
	}

	if publicURL := os.Getenv("PULSE_PUBLIC_URL"); publicURL != "" {
		cfg.PublicURL = publicURL
		cfg.EnvOverrides["publicURL"] = true
		log.Info().Str("url", publicURL).Msg("Public URL configured from PULSE_PUBLIC_URL env var")
	} else {
		// In hosted mode, fail closed unless explicitly configured.
		if os.Getenv("PULSE_HOSTED_MODE") == "true" {
			log.Warn().Msg("Hosted mode enabled: public URL not configured; external links (e.g., magic links) will be disabled. Set PULSE_PUBLIC_URL.")
		} else {
			// Try to auto-detect public URL if not explicitly configured
			if detectedURL := detectPublicURL(cfg.FrontendPort); detectedURL != "" {
				cfg.PublicURL = detectedURL
				log.Info().Str("url", detectedURL).Msg("Auto-detected public URL for webhook notifications")
			}
		}
	}

	if initLogging {
		// Initialize logging with configuration values
		logging.Init(logging.Config{
			Format:     cfg.LogFormat,
			Level:      cfg.LogLevel,
			Component:  "pulse-config",
			FilePath:   cfg.LogFile,
			MaxSizeMB:  cfg.LogMaxSize,
			MaxAgeDays: cfg.LogMaxAge,
			Compress:   cfg.LogCompress,
		})
	}

	// Initialize DNS cache with configured timeout
	// This must be done before any HTTP clients are created
	tlsutil.SetDNSCacheTTL(cfg.DNSCacheTimeout)

	// Validate configuration
	if err := cfg.Validate(); err != nil {
		return nil, fmt.Errorf("load config: invalid configuration: %w", err)
	}

	return cfg, nil
}

// Validate checks if the configuration is valid
func (c *Config) Validate() error {
	// Validate server settings
	if c.FrontendPort <= 0 || c.FrontendPort > 65535 {
		return fmt.Errorf("invalid frontend port: %d", c.FrontendPort)
	}
	if c.SSHPort != 0 && (c.SSHPort < 1 || c.SSHPort > 65535) {
		return fmt.Errorf("invalid SSH port: %d (must be between 1 and 65535)", c.SSHPort)
	}
	if c.HTTPRedirectPort != 0 {
		if c.HTTPRedirectPort < 1 || c.HTTPRedirectPort > 65535 {
			return fmt.Errorf("invalid HTTP redirect port: %d (must be between 1 and 65535)", c.HTTPRedirectPort)
		}
		if c.HTTPRedirectPort == c.FrontendPort {
			return fmt.Errorf("HTTP redirect port (%d) must differ from frontend port", c.HTTPRedirectPort)
		}
	}
	if c.AgentIngestPort != 0 {
		if c.AgentIngestPort < 1 || c.AgentIngestPort > 65535 {
			return fmt.Errorf("invalid agent ingest port: %d (must be between 1 and 65535)", c.AgentIngestPort)
		}
		if c.AgentIngestPort == c.FrontendPort {
			return fmt.Errorf("agent ingest port (%d) must differ from frontend port", c.AgentIngestPort)
		}
		if c.HTTPRedirectPort != 0 && c.AgentIngestPort == c.HTTPRedirectPort {
			return fmt.Errorf("agent ingest port (%d) must differ from HTTP redirect port", c.AgentIngestPort)
		}
	}

	// Validate monitoring settings
	if c.PVEPollingInterval < 10*time.Second {
		return fmt.Errorf("PVE polling interval must be at least 10 seconds")
	}
	if c.PVEPollingInterval > time.Hour {
		return fmt.Errorf("PVE polling interval cannot exceed 1 hour")
	}
	if c.ConnectionTimeout < time.Second {
		return fmt.Errorf("connection timeout must be at least 1 second")
	}
	if c.AdaptivePollingMinInterval <= 0 {
		return fmt.Errorf("adaptive polling min interval must be greater than 0")
	}
	if c.AdaptivePollingBaseInterval <= 0 {
		return fmt.Errorf("adaptive polling base interval must be greater than 0")
	}
	if c.AdaptivePollingMaxInterval <= 0 {
		return fmt.Errorf("adaptive polling max interval must be greater than 0")
	}
	if c.AdaptivePollingMinInterval > c.AdaptivePollingMaxInterval {
		return fmt.Errorf("adaptive polling min interval cannot exceed max interval")
	}
	if c.AdaptivePollingBaseInterval < c.AdaptivePollingMinInterval || c.AdaptivePollingBaseInterval > c.AdaptivePollingMaxInterval {
		return fmt.Errorf("adaptive polling base interval must be between min and max intervals")
	}

	// Validate PVE instances
	for i, pve := range c.PVEInstances {
		if pve.Host == "" {
			return fmt.Errorf("PVE instance %d: host is required", i+1)
		}
		if !strings.HasPrefix(pve.Host, "http://") && !strings.HasPrefix(pve.Host, "https://") {
			return fmt.Errorf("PVE instance %d: host must start with http:// or https://", i+1)
		}
		// Must have either password or token
		if pve.Password == "" && (pve.TokenName == "" || pve.TokenValue == "") {
			return fmt.Errorf("PVE instance %d: either password or token authentication is required", i+1)
		}
	}

	// Validate and auto-fix PBS instances
	validPBS := []PBSInstance{}
	for i, pbs := range c.PBSInstances {
		if pbs.Host == "" {
			log.Warn().Int("instance", i+1).Msg("PBS instance missing host, skipping")
			continue
		}
		// Auto-fix missing protocol
		if !strings.HasPrefix(pbs.Host, "http://") && !strings.HasPrefix(pbs.Host, "https://") {
			pbs.Host = "https://" + pbs.Host
			log.Info().Str("host", pbs.Host).Msg("PBS host auto-corrected to include https://")
		}
		// Check authentication
		if pbs.Password == "" && (pbs.TokenName == "" || pbs.TokenValue == "") {
			log.Warn().Int("instance", i+1).Str("host", pbs.Host).Msg("PBS instance missing authentication, skipping")
			continue
		}
		validPBS = append(validPBS, pbs)
	}
	c.PBSInstances = validPBS

	return nil
}

// detectPublicURL attempts to automatically detect the public URL for Pulse
func detectPublicURL(port int) string {
	// When running inside Docker we can't reliably determine an externally reachable address.
	// Returning an empty string avoids surfacing container-only IPs (e.g., 172.x) in notifications.
	if _, err := osStat("/.dockerenv"); err == nil {
		log.Info().Msg("Docker environment detected - skipping public URL auto-detect. Set PULSE_PUBLIC_URL to expose external links.")
		return ""
	}

	// Method 1: Check if we're in a Proxmox container (most common deployment)
	if _, err := osStat("/etc/pve"); err == nil {
		// We're likely in a ProxmoxVE container
		// Try to get the container's IP from hostname -I
		if output, err := execCommand("hostname", "-I").Output(); err == nil {
			ips := strings.Fields(string(output))
			for _, ip := range ips {
				// Skip localhost and IPv6
				if !strings.HasPrefix(ip, "127.") && !strings.Contains(ip, ":") {
					return fmt.Sprintf("http://%s:%d", ip, port)
				}
			}
		}
	}

	// Method 2: Try to get the primary network interface IP
	if ip := getOutboundIP(); ip != "" {
		return fmt.Sprintf("http://%s:%d", ip, port)
	}

	// Method 3: Get all non-loopback IPs and use the first private one
	if addrs, err := netInterfaceAddrs(); err == nil {
		for _, addr := range addrs {
			if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
				if ipnet.IP.To4() != nil {
					ip := ipnet.IP.String()
					// Prefer private IPs (RFC1918)
					if strings.HasPrefix(ip, "192.168.") ||
						strings.HasPrefix(ip, "10.") ||
						strings.HasPrefix(ip, "172.") {
						return fmt.Sprintf("http://%s:%d", ip, port)
					}
				}
			}
		}
		// If no private IP found, use the first public one
		for _, addr := range addrs {
			if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
				if ipnet.IP.To4() != nil {
					return fmt.Sprintf("http://%s:%d", ipnet.IP.String(), port)
				}
			}
		}
	}

	return ""
}

// getOutboundIP gets the preferred outbound IP of this machine
func getOutboundIP() string {
	// Try to connect to a public DNS server (doesn't actually connect, just resolves the route)
	conn, err := netDial("udp", "8.8.8.8:80")
	if err != nil {
		// Try Cloudflare DNS as fallback
		conn, err = netDial("udp", "1.1.1.1:80")
		if err != nil {
			return ""
		}
	}
	defer conn.Close()

	localAddr, ok := conn.LocalAddr().(*net.UDPAddr)
	if !ok || localAddr == nil || localAddr.IP == nil {
		return ""
	}
	return localAddr.IP.String()
}