package api

import (
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"os/exec"
	"path/filepath"
	"strconv"
	"strings"
	"time"
	"unicode"
	"unicode/utf8"

	"github.com/rcourtman/pulse-go-rewrite/internal/config"
	"github.com/rcourtman/pulse-go-rewrite/internal/updates"
	internalauth "github.com/rcourtman/pulse-go-rewrite/pkg/auth"
	"github.com/rs/zerolog/log"
)

// detectServiceName detects the actual systemd service name being used
func detectServiceName() string {
	// Try common service names
	services := []string{"pulse-backend", "pulse", "pulse.service", "pulse-backend.service"}

	for _, service := range services {
		cmd := exec.Command("systemctl", "status", service)
		if err := cmd.Run(); err == nil {
			// Service exists
			if strings.HasSuffix(service, ".service") {
				return strings.TrimSuffix(service, ".service")
			}
			return service
		}
	}

	// Default to pulse-backend if no service found
	return "pulse-backend"
}

// validateBcryptHash ensures the hash is complete (60 characters)
func validateBcryptHash(hash string) error {
	if len(hash) != 60 {
		return fmt.Errorf("invalid bcrypt hash: expected 60 characters, got %d. Hash may be truncated", len(hash))
	}
	if !strings.HasPrefix(hash, "$2a$") && !strings.HasPrefix(hash, "$2b$") && !strings.HasPrefix(hash, "$2y$") {
		return fmt.Errorf("invalid bcrypt hash: must start with $2a$, $2b$, or $2y$")
	}
	return nil
}

const maxLocalAuthUsernameRunes = 128

func validateLocalAuthUsername(username string) error {
	if username == "" {
		return fmt.Errorf("username is required")
	}
	if username != strings.TrimSpace(username) {
		return fmt.Errorf("username must not begin or end with whitespace")
	}
	if utf8.RuneCountInString(username) > maxLocalAuthUsernameRunes {
		return fmt.Errorf("username must be at most %d characters", maxLocalAuthUsernameRunes)
	}

	for _, r := range username {
		if unicode.IsLetter(r) || unicode.IsDigit(r) || strings.ContainsRune("._@+-", r) {
			continue
		}
		return fmt.Errorf("username may contain only letters, numbers, periods, underscores, hyphens, plus signs, and @")
	}

	return nil
}

func quoteAuthEnvValue(value string) (string, error) {
	if strings.ContainsAny(value, "'\r\n\x00") {
		return "", fmt.Errorf("auth environment value contains unsupported characters")
	}
	return "'" + value + "'", nil
}

func renderAuthEnvFile(generatedAt time.Time, username, hashedPassword string) ([]byte, error) {
	quotedUsername, err := quoteAuthEnvValue(username)
	if err != nil {
		return nil, err
	}
	quotedPassword, err := quoteAuthEnvValue(hashedPassword)
	if err != nil {
		return nil, err
	}

	return []byte(fmt.Sprintf(`# Auto-generated by Pulse Quick Security Setup
# Generated on %s
# IMPORTANT: Keep authentication values quoted.
PULSE_AUTH_USER=%s
PULSE_AUTH_PASS=%s
PULSE_AUDIT_LOG=true
`, generatedAt.Format(time.RFC3339), quotedUsername, quotedPassword)), nil
}

func quoteSystemdEnvironment(name, value string) (string, error) {
	if strings.ContainsAny(name, "=\r\n\x00") || strings.ContainsAny(value, "\r\n\x00") {
		return "", fmt.Errorf("systemd environment value contains unsupported characters")
	}
	return "Environment=" + strconv.Quote(name+"="+value), nil
}

func renderSystemdAuthOverride(generatedAt time.Time, username, hashedPassword string) ([]byte, error) {
	usernameLine, err := quoteSystemdEnvironment("PULSE_AUTH_USER", username)
	if err != nil {
		return nil, err
	}
	passwordLine, err := quoteSystemdEnvironment("PULSE_AUTH_PASS", hashedPassword)
	if err != nil {
		return nil, err
	}
	auditLine, err := quoteSystemdEnvironment("PULSE_AUDIT_LOG", "true")
	if err != nil {
		return nil, err
	}

	return []byte(fmt.Sprintf(`# Auto-generated by Pulse Quick Security Setup
# Generated on %s
[Service]
%s
%s
%s
`, generatedAt.Format(time.RFC3339), usernameLine, passwordLine, auditLine)), nil
}

// isRunningAsRoot checks if the process has root privileges
func isRunningAsRoot() bool {
	return os.Geteuid() == 0
}

func ensureAdminSession(cfg *config.Config, w http.ResponseWriter, req *http.Request) bool {
	// Session users must match configured admin identity for privileged operations.
	if cookie, err := readSessionCookie(req); err == nil && cookie.Value != "" && ValidateSession(cookie.Value) {
		sessionUser := strings.TrimSpace(GetSessionUsername(cookie.Value))
		configuredAdmin := ""
		if cfg != nil {
			configuredAdmin = strings.TrimSpace(cfg.AuthUser)
		}

		if configuredAdmin != "" && strings.EqualFold(sessionUser, configuredAdmin) {
			return true
		}

		// Org-scoped tenant sessions preserve canonical org management
		// privileges for settings-bound routes.
		orgScoped := false
		if org := GetOrganization(req.Context()); org != nil {
			orgID := strings.TrimSpace(org.ID)
			if orgID != "" && orgID != "default" {
				orgScoped = true
				if org.CanUserIDManage(sessionUser) {
					return true
				}
			}
		}

		if !orgScoped && sessionUserCarriesAdminPrivileges(cfg, sessionUser) {
			return true
		}

		if configuredAdmin == "" || !strings.EqualFold(sessionUser, configuredAdmin) {
			log.Warn().
				Str("path", req.URL.Path).
				Str("user", sessionUser).
				Msg("Session user missing admin privileges for privileged operation")
			http.Error(w, "Admin privileges required", http.StatusForbidden)
			return false
		}
	}
	return true
}

// sessionIsOrgScoped reports whether the request is bound to a tenant
// organization rather than the instance itself. Instance-admin rules must not
// be applied to an org-scoped session: those callers are governed by their
// organization's own management rules rather than global RBAC assignments.
func sessionIsOrgScoped(req *http.Request) bool {
	if req == nil {
		return false
	}
	org := GetOrganization(req.Context())
	if org == nil {
		return false
	}
	orgID := strings.TrimSpace(org.ID)
	return orgID != "" && orgID != "default"
}

// sessionUserCarriesAdminPrivileges reports whether a non-org-scoped session
// username carries instance admin privileges: the configured local admin
// identity or an RBAC assignment granting the admin action on all resources.
// SSO authentication alone never grants instance administration; SSO-only
// deployments must map a trusted identity-provider group to an administrator
// role or retain a configured local administrator.
func sessionUserCarriesAdminPrivileges(cfg *config.Config, sessionUser string) bool {
	sessionUser = strings.TrimSpace(sessionUser)
	if sessionUser == "" {
		return false
	}
	configuredAdmin := ""
	if cfg != nil {
		configuredAdmin = strings.TrimSpace(cfg.AuthUser)
	}
	if configuredAdmin != "" && strings.EqualFold(sessionUser, configuredAdmin) {
		return true
	}
	if sessionUserHasRBACAdminGrant(sessionUser) {
		return true
	}
	return false
}

// sessionUserHasRBACAdminGrant reports whether the user's effective RBAC
// permissions include an allow of the admin action on all resources — the
// shape of the built-in Administrator role that SSO group role mappings
// assign. A missing manager or empty assignment simply reports false.
func sessionUserHasRBACAdminGrant(username string) bool {
	username = strings.TrimSpace(username)
	if username == "" {
		return false
	}
	manager := internalauth.GetManager()
	if manager == nil {
		return false
	}
	for _, perm := range manager.GetUserPermissions(username) {
		if strings.EqualFold(perm.Effect, internalauth.EffectDeny) {
			continue
		}
		if perm.Action == "admin" && perm.Resource == "*" {
			return true
		}
	}
	return false
}

func ensureSettingsScope(cfg *config.Config, w http.ResponseWriter, req *http.Request, scope string) bool {
	record := getAPITokenRecordFromRequest(req)
	if record != nil {
		if record.HasScope(scope) {
			return true
		}

		log.Warn().
			Str("token_id", record.ID).
			Str("path", req.URL.Path).
			Str("required_scope", scope).
			Msg("API token missing required settings scope for privileged operation")
		respondMissingScope(w, scope)
		return false
	}

	if !ensureAdminSession(cfg, w, req) {
		return false
	}

	return true
}

func ensureSettingsReadScope(cfg *config.Config, w http.ResponseWriter, req *http.Request) bool {
	return ensureSettingsScope(cfg, w, req, config.ScopeSettingsRead)
}

func ensureSettingsWriteScope(cfg *config.Config, w http.ResponseWriter, req *http.Request) bool {
	return ensureSettingsScope(cfg, w, req, config.ScopeSettingsWrite)
}

// handleQuickSecuritySetupFixed is the fixed version of the Quick Security Setup
func handleQuickSecuritySetupFixed(r *Router) http.HandlerFunc {
	return func(w http.ResponseWriter, req *http.Request) {
		if req.Method != http.MethodPost {
			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
			return
		}

		// Apply rate limiting to prevent brute force attacks
		clientIP := GetClientIP(req)
		if !authLimiter.Allow(clientIP) {
			log.Warn().Str("ip", clientIP).Msg("Rate limit exceeded for security setup")
			http.Error(w, "Too many attempts. Please try again later.", http.StatusTooManyRequests)
			return
		}

		// Parse request body
		var setupRequest struct {
			Username            string `json:"username"`
			Password            string `json:"password"`
			APIToken            string `json:"apiToken"`
			EnableNotifications bool   `json:"enableNotifications"`
			DarkMode            bool   `json:"darkMode"`
			Force               bool   `json:"force"`
			SetupToken          string `json:"setupToken"`
		}

		if err := decodeSecurityRequestBody(w, req, &setupRequest); err != nil {
			http.Error(w, "Invalid request body", securityRequestErrorStatus(err))
			return
		}

		authConfigured := r.config.AuthUser != "" && r.config.AuthPass != ""
		setupCompleted := false
		defer func() {
			if setupCompleted {
				r.clearBootstrapToken()
			}
		}()
		forceRequested := setupRequest.Force

		clientIP = GetClientIP(req)
		recoveryToken := strings.TrimSpace(req.Header.Get("X-Recovery-Token"))
		recoveryAuthorized := false
		if recoveryToken != "" {
			if GetRecoveryTokenStore().ValidateRecoveryTokenConstantTime(recoveryToken, clientIP) {
				recoveryAuthorized = true
				log.Warn().
					Str("ip", clientIP).
					Msg("Quick security setup invoked using recovery token")
			} else {
				log.Warn().
					Str("ip", clientIP).
					Msg("Invalid recovery token for quick security setup")
			}
		}

		authorized := recoveryAuthorized

		// Only require authentication if credentials are already configured.
		if !authorized && authConfigured {
			wrapped := &responseCapture{ResponseWriter: w}
			if checkAuth(r.config, wrapped, req, false) {
				// If proxy auth is configured, require admin role for changes.
				if r.config.ProxyAuthSecret != "" {
					if valid, username, isAdmin := CheckProxyAuth(r.config, req); valid && !isAdmin {
						log.Warn().
							Str("ip", clientIP).
							Str("username", username).
							Msg("Non-admin user attempted quick security setup")
						http.Error(w, "Admin privileges required", http.StatusForbidden)
						return
					}
				}
				authorized = true
			} else {
				if !wrapped.wrote {
					http.Error(w, "Authentication required to modify existing security settings", http.StatusUnauthorized)
				}
				return
			}
		}

		if !authorized && !authConfigured {
			if r.bootstrapTokenHash == "" {
				log.Error().Msg("Bootstrap setup token unavailable; refusing unauthenticated quick setup")
				http.Error(w, "Bootstrap token unavailable; restart Pulse or inspect data directory", http.StatusServiceUnavailable)
				return
			}

			providedToken := strings.TrimSpace(req.Header.Get(bootstrapTokenHeader))
			if providedToken == "" {
				providedToken = strings.TrimSpace(setupRequest.SetupToken)
			}

			// The bootstrap token is the security boundary for initial setup:
			// only callers with filesystem access to the data dir can read it.
			// A valid token authorizes setup from any origin so users running
			// Pulse in a Proxmox LXC (the common case) can complete setup from
			// their workstation browser. Without a token, only direct loopback
			// can finish setup — that lane preserves the legacy console flow.
			if providedToken == "" {
				if !isDirectLoopbackRequest(req) {
					log.Warn().
						Str("ip", clientIP).
						Msg("Rejected initial quick setup: no bootstrap token from non-loopback origin")
					errorMsg := "Initial security setup requires the bootstrap token when accessed outside localhost. Retrieve it from the host:\n\n" +
						"Docker: docker exec <container> /app/pulse bootstrap-token\n" +
						"Bare metal: pulse bootstrap-token"
					http.Error(w, errorMsg, http.StatusForbidden)
					return
				}
				errorMsg := "Bootstrap setup token required. Retrieve it from the host:\n\n" +
					"Docker: docker exec <container> /app/pulse bootstrap-token\n" +
					"Bare metal: pulse bootstrap-token"
				http.Error(w, errorMsg, http.StatusUnauthorized)
				return
			}

			if !r.bootstrapTokenValid(providedToken) {
				log.Warn().
					Str("ip", clientIP).
					Msg("Rejected quick setup with invalid bootstrap token")
				errorMsg := "Invalid bootstrap setup token. Retrieve the correct token from the host:\n\n" +
					"Docker: docker exec <container> /app/pulse bootstrap-token\n" +
					"Bare metal: pulse bootstrap-token"
				http.Error(w, errorMsg, http.StatusUnauthorized)
				return
			}

			authorized = true
		}

		if authConfigured && !authorized {
			log.Warn().
				Str("ip", clientIP).
				Msg("Unauthorized quick security setup attempt rejected")
			http.Error(w, "Authentication required to modify existing security settings", http.StatusUnauthorized)
			return
		}

		if authorized && !ensureSettingsWriteScope(r.config, w, req) {
			return
		}

		setupRequest.Force = forceRequested && authorized

		if authConfigured && !setupRequest.Force {
			log.Info().Msg("Security setup skipped - password auth already configured")
			response := map[string]interface{}{
				"success": true,
				"skipped": true,
				"message": "Password authentication is already configured. Please remove existing security first if you want to reconfigure.",
			}
			w.Header().Set("Content-Type", "application/json")
			json.NewEncoder(w).Encode(response)
			return
		}

		if setupRequest.Force {
			log.Info().Msg("Quick security setup invoked with force=true - rotating credentials")
		}

		// Validate inputs before any runtime or persistent security state changes.
		if setupRequest.Username == "" || setupRequest.Password == "" || setupRequest.APIToken == "" {
			http.Error(w, "Username, password, and API token are required", http.StatusBadRequest)
			return
		}
		if err := validateLocalAuthUsername(setupRequest.Username); err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		// Validate password complexity
		if err := internalauth.ValidatePasswordComplexity(setupRequest.Password); err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		// Hash the password
		hashedPassword, err := internalauth.HashPassword(setupRequest.Password)
		if err != nil {
			log.Error().Err(err).Msg("Failed to hash password")
			http.Error(w, "Failed to process password", http.StatusInternalServerError)
			return
		}

		// Validate the bcrypt hash is complete
		if err := validateBcryptHash(hashedPassword); err != nil {
			log.Error().Err(err).Msg("Generated invalid bcrypt hash")
			http.Error(w, "Failed to process password", http.StatusInternalServerError)
			return
		}
		authEnvContent, err := renderAuthEnvFile(time.Now(), setupRequest.Username, hashedPassword)
		if err != nil {
			log.Error().Err(err).Msg("Failed to encode authentication configuration")
			http.Error(w, "Failed to save security configuration", http.StatusInternalServerError)
			return
		}

		// Store the raw API token for displaying to the user
		rawAPIToken := setupRequest.APIToken

		tokenRecord, err := config.NewAPITokenRecord(rawAPIToken, "Primary token", nil)
		if err != nil {
			log.Error().Err(err).Msg("Failed to construct API token record")
			http.Error(w, "Failed to process API token", http.StatusInternalServerError)
			return
		}
		setAPITokenOwnerUserID(tokenRecord, setupRequest.Username)

		// Persist the canonical auth file for every deployment type before
		// updating runtime state. Systemd root installs also write an override
		// below, but the canonical file keeps config reloads and recovery
		// independent of service-name detection.
		envPath, err := writeAuthEnvFile(r.config.ConfigPath, r.config.DataPath, authEnvContent)
		if err != nil {
			log.Error().Err(err).Msg("Failed to write authentication configuration")
			http.Error(w, "Failed to save security configuration", http.StatusInternalServerError)
			return
		}

		if r.config.HasAPITokens() && r.config.AuthUser == "" && r.config.AuthPass == "" {
			// We had API-only access before, now replacing with full security
			log.Info().Msg("Replacing API-only token with new secure token")
		}

		// Update runtime config immediately with hashed token - no restart needed!
		config.Mu.Lock()
		previousTokens := append([]config.APITokenRecord(nil), r.config.APITokens...)
		r.config.AuthUser = setupRequest.Username
		r.config.AuthPass = hashedPassword
		r.config.APITokens = []config.APITokenRecord{*tokenRecord}
		r.config.SortAPITokens()
		if r.persistence != nil {
			if err := r.persistence.SaveAPITokens(r.config.APITokens); err != nil {
				r.config.APITokens = previousTokens
				r.config.SortAPITokens()
				config.Mu.Unlock()
				log.Error().Err(err).Msg("Failed to persist API tokens during security setup")
				http.Error(w, "Password authentication was saved, but the API token could not be saved", http.StatusInternalServerError)
				return
			}
		}
		config.Mu.Unlock()
		log.Info().Msg("Runtime config updated with new security settings - active immediately")

		if err := r.establishSession(w, req, setupRequest.Username); err != nil {
			log.Error().Err(err).Msg("Failed to establish session after quick security setup")
			http.Error(w, "Failed to establish session after setup", http.StatusInternalServerError)
			return
		}

		// Clear any agents that connected during the brief unauthenticated setup window.
		// This prevents stale/unauthorized agent data from appearing in the wizard.
		if r.monitor != nil {
			hostCleared, dockerCleared := r.monitor.ClearUnauthenticatedAgents()
			if hostCleared > 0 || dockerCleared > 0 {
				log.Info().
					Int("hosts", hostCleared).
					Int("dockerHosts", dockerCleared).
					Msg("Cleared agents that connected before security was configured")
			}
		}

		// Save system settings to system.json
		systemSettings := config.DefaultSystemSettings()
		systemSettings.ConnectionTimeout = 10    // Default seconds
		systemSettings.AutoUpdateEnabled = false // Default disabled
		if err := r.persistence.SaveSystemSettings(*systemSettings); err != nil {
			log.Error().Err(err).Msg("Failed to save system settings")
			// Continue anyway - not critical for auth setup
		}

		// Detect environment
		isSystemd := os.Getenv("INVOCATION_ID") != ""
		isDocker := os.Getenv("PULSE_DOCKER") == "true"
		isRoot := isRunningAsRoot()

		// Detect actual service name if systemd
		serviceName := ""
		if isSystemd {
			serviceName = detectServiceName()
			log.Info().Str("service", serviceName).Msg("Detected systemd service name")
		}

		// Choose appropriate method based on environment
		if isDocker {
			log.Info().Str("path", envPath).Msg("Docker security configuration saved")

			response := map[string]interface{}{
				"success":               true,
				"method":                "docker",
				"deploymentType":        "docker",
				"requiresManualRestart": false,
				"message":               "Security enabled immediately! Your settings are saved and active.",
				"note":                  "Configuration saved to /data/.env for persistence across restarts.",
			}

			w.Header().Set("Content-Type", "application/json")
			setupCompleted = true
			json.NewEncoder(w).Encode(response)

		} else if isSystemd && !isRoot {
			// Systemd but not root (ProxmoxVE script scenario)
			// Don't attempt sudo, just save config and provide instructions

			// Create response - security is active immediately
			response := map[string]interface{}{
				"success":               true,
				"method":                "systemd-nonroot",
				"serviceName":           serviceName,
				"envFile":               envPath,
				"deploymentType":        updates.GetDeploymentType(),
				"requiresManualRestart": false,
				"message":               "Security enabled immediately! Your settings are saved and active.",
				"note":                  fmt.Sprintf("Configuration saved to %s for persistence across restarts.", envPath),
			}

			w.Header().Set("Content-Type", "application/json")
			setupCompleted = true
			json.NewEncoder(w).Encode(response)

		} else if isSystemd && isRoot {
			// Systemd with root - can apply directly

			// Create systemd override
			overridePath := fmt.Sprintf("/etc/systemd/system/%s.service.d/override.conf", serviceName)
			overrideDir := filepath.Dir(overridePath)

			if err := os.MkdirAll(overrideDir, 0755); err != nil {
				log.Error().Err(err).Msg("Failed to create override directory")
				http.Error(w, "Failed to create systemd override directory", http.StatusInternalServerError)
				return
			}

			overrideContent, err := renderSystemdAuthOverride(time.Now(), setupRequest.Username, hashedPassword)
			if err != nil {
				log.Error().Err(err).Msg("Failed to encode systemd authentication configuration")
				http.Error(w, "Failed to save security configuration", http.StatusInternalServerError)
				return
			}

			if err := os.WriteFile(overridePath, overrideContent, 0644); err != nil {
				log.Error().Err(err).Msg("Failed to write systemd override")
				http.Error(w, "Failed to write systemd override", http.StatusInternalServerError)
				return
			}

			// Reload systemd
			if err := exec.Command("systemctl", "daemon-reload").Run(); err != nil {
				log.Warn().Err(err).Msg("Failed to reload systemd daemon")
			}

			response := map[string]interface{}{
				"success":               true,
				"method":                "systemd-root",
				"serviceName":           serviceName,
				"envFile":               envPath,
				"deploymentType":        updates.GetDeploymentType(),
				"automatic":             true,
				"requiresManualRestart": false,
				"message":               "Security enabled immediately! Your settings are saved and active.",
				"note":                  "Authentication file and systemd override created for persistence across restarts.",
			}

			w.Header().Set("Content-Type", "application/json")
			setupCompleted = true
			json.NewEncoder(w).Encode(response)

		} else {
			// Manual installation or development
			// Get deployment type for restart instructions
			deploymentType := updates.GetDeploymentType()

			response := map[string]interface{}{
				"success":               true,
				"method":                "manual",
				"envFile":               envPath,
				"deploymentType":        deploymentType,
				"requiresManualRestart": false,
				"message":               "Security enabled immediately! Your settings are saved and active.",
				"note":                  fmt.Sprintf("Configuration saved to %s for persistence across restarts.", envPath),
			}

			w.Header().Set("Content-Type", "application/json")
			setupCompleted = true
			json.NewEncoder(w).Encode(response)
		}
	}
}

// HandleRegenerateAPIToken generates and persists a new API token.
func (r *Router) HandleRegenerateAPIToken(w http.ResponseWriter, rq *http.Request) {
	if rq.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	if !CheckAuth(r.config, w, rq) {
		return
	}

	// Check proxy auth for admin status
	if r.config.ProxyAuthSecret != "" {
		if valid, username, isAdmin := CheckProxyAuth(r.config, rq); valid && !isAdmin {
			log.Warn().
				Str("ip", GetClientIP(rq)).
				Str("username", username).
				Msg("Non-admin user attempted API token regeneration")
			http.Error(w, "Admin privileges required", http.StatusForbidden)
			return
		}
	}

	if !ensureSettingsWriteScope(r.config, w, rq) {
		return
	}

	// Apply rate limiting to prevent abuse
	clientIP := GetClientIP(rq)
	if !authLimiter.Allow(clientIP) {
		log.Warn().Str("ip", clientIP).Msg("Rate limit exceeded for API token generation")
		http.Error(w, "Too many attempts. Please try again later.", http.StatusTooManyRequests)
		return
	}

	// Generate new token using the auth package
	rawToken, err := internalauth.GenerateAPIToken()
	if err != nil {
		log.Error().Err(err).Msg("Failed to generate API token")
		http.Error(w, "Failed to generate token", http.StatusInternalServerError)
		return
	}

	tokenRecord, err := config.NewAPITokenRecord(rawToken, "Regenerated token", nil)
	if err != nil {
		log.Error().Err(err).Msg("Failed to construct API token record")
		http.Error(w, "Failed to generate token", http.StatusInternalServerError)
		return
	}
	setAPITokenOwnerUserID(tokenRecord, apiTokenOwnerUserIDForRequest(r.config, rq))

	config.Mu.Lock()
	previousTokens := append([]config.APITokenRecord(nil), r.config.APITokens...)
	r.config.APITokens = []config.APITokenRecord{*tokenRecord}
	r.config.SortAPITokens()
	if r.persistence != nil {
		if err := r.persistence.SaveAPITokens(r.config.APITokens); err != nil {
			r.config.APITokens = previousTokens
			r.config.SortAPITokens()
			config.Mu.Unlock()
			log.Error().Err(err).Msg("Failed to persist regenerated API token")
			http.Error(w, "Failed to save token", http.StatusInternalServerError)
			return
		}
	}
	config.Mu.Unlock()
	log.Info().Msg("Runtime config updated with new API token - active immediately")

	log.Info().Msg("API token regenerated successfully")

	// Get deployment type for restart instructions
	deploymentType := updates.GetDeploymentType()

	response := map[string]interface{}{
		"success":         true,
		"token":           rawToken, // Return the raw token to the user (only shown once!)
		"deploymentType":  deploymentType,
		"requiresRestart": false,
		"message":         "New API token generated and active immediately! Save this token - it won't be shown again.",
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(response)
}

// HandleValidateAPIToken validates an API token without logging it
func (r *Router) HandleValidateAPIToken(w http.ResponseWriter, rq *http.Request) {
	if rq.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	// Require authentication to prevent unauthenticated token guessing oracle
	if !CheckAuth(r.config, w, rq) {
		return
	}

	// Check proxy auth for admin status
	if r.config.ProxyAuthSecret != "" {
		if valid, username, isAdmin := CheckProxyAuth(r.config, rq); valid && !isAdmin {
			log.Warn().
				Str("ip", GetClientIP(rq)).
				Str("username", username).
				Msg("Non-admin user attempted API token validation")
			http.Error(w, "Admin privileges required", http.StatusForbidden)
			return
		}
	}

	if !ensureSettingsWriteScope(r.config, w, rq) {
		return
	}

	// Apply rate limiting to prevent brute force attacks
	clientIP := GetClientIP(rq)
	if !authLimiter.Allow(clientIP) {
		log.Warn().Str("ip", clientIP).Msg("Rate limit exceeded for API token validation")
		http.Error(w, "Too many attempts. Please try again later.", http.StatusTooManyRequests)
		return
	}

	// Parse request body
	var validateRequest struct {
		Token string `json:"token"`
	}

	if err := decodeSecurityRequestBody(w, rq, &validateRequest); err != nil {
		http.Error(w, "Invalid request body", securityRequestErrorStatus(err))
		return
	}

	if validateRequest.Token == "" {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusBadRequest)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"valid":   false,
			"message": "Token is required",
		})
		return
	}

	// Check if API token auth is enabled
	if !r.config.HasAPITokens() {
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(map[string]interface{}{
			"valid":   false,
			"message": "API token authentication is not configured",
		})
		return
	}

	// Validate the token (compare hash)
	config.Mu.RLock()
	_, isValid := r.config.ValidateAPIToken(validateRequest.Token)
	config.Mu.RUnlock()

	// Log validation attempt without logging the token itself
	if isValid {
		log.Debug().
			Str("ip", clientIP).
			Msg("API token validation successful")
	} else {
		log.Warn().
			Str("ip", clientIP).
			Msg("API token validation failed")
	}

	// Return validation result
	response := map[string]interface{}{
		"valid": isValid,
	}

	if isValid {
		response["message"] = "Token is valid"
	} else {
		response["message"] = "Token is invalid"
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(response)
}