pulse/internal/api/resources.go

package api

import (
	"context"
	"encoding/json"
	"errors"
	"io"
	"net/http"
	"sort"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/rcourtman/pulse-go-rewrite/internal/config"
	"github.com/rcourtman/pulse-go-rewrite/internal/models"
	"github.com/rcourtman/pulse-go-rewrite/internal/storagehealth"
	unified "github.com/rcourtman/pulse-go-rewrite/internal/unifiedresources"
	"github.com/rcourtman/pulse-go-rewrite/pkg/auth"
	"github.com/rs/zerolog/log"
)

// ResourceHandlers provides HTTP handlers for the unified resource API.
type ResourceHandlers struct {
	cfg                 *config.Config
	storeMu             sync.Mutex
	stores              map[string]unified.ResourceStore
	cacheMu             sync.Mutex
	registryCache       map[string]registryCacheEntry
	supplementalMu      sync.RWMutex
	supplementalRecords map[unified.DataSource]SupplementalRecordsProvider
	stateProvider       SnapshotProvider
	tenantStateProvider TenantStateProvider
	actionExecutor      ActionExecutor
	actionCompleted     func(unified.ActionAuditRecord)
	discoveryReadiness  ResourceDiscoveryReadinessProvider
}

// ResourceDiscoveryReadinessProvider projects service-discovery state onto a
// unified resource without coupling the resource API to discovery storage.
type ResourceDiscoveryReadinessProvider interface {
	DiscoveryReadinessForResource(resource unified.Resource, now time.Time) unified.ResourceDiscoveryReadiness
}

type registrySeed struct {
	snapshot      models.StateSnapshot
	resources     []unified.Resource
	lastUpdate    time.Time
	unifiedSource bool
}

// SupplementalRecordsProvider provides out-of-band ingest records for a specific source.
type SupplementalRecordsProvider interface {
	GetCurrentRecords() []unified.IngestRecord
}

// TenantSupplementalRecordsProvider is an optional interface for providers that can scope
// supplemental records to a specific organization. This prevents cross-tenant leakage when
// Pulse runs in multi-tenant mode.
//
// Providers that do not implement this interface will be treated as "global"/legacy and
// their records will be ingested into every tenant registry.
type TenantSupplementalRecordsProvider interface {
	GetCurrentRecordsForOrg(orgID string) []unified.IngestRecord
}

// SupplementalSnapshotSourceOwner is an optional interface for providers that
// own source-native resource ingestion and want matching legacy snapshot slices
// suppressed during registry construction.
type SupplementalSnapshotSourceOwner interface {
	SnapshotOwnedSources() []unified.DataSource
}

// TenantSupplementalSnapshotSourceOwner is the tenant-aware variant of
// SupplementalSnapshotSourceOwner.
type TenantSupplementalSnapshotSourceOwner interface {
	SnapshotOwnedSourcesForOrg(orgID string) []unified.DataSource
}

// NewResourceHandlers creates a new ResourceHandlers.
func NewResourceHandlers(cfg *config.Config) *ResourceHandlers {
	return &ResourceHandlers{
		cfg:                 cfg,
		stores:              make(map[string]unified.ResourceStore),
		registryCache:       make(map[string]registryCacheEntry),
		supplementalRecords: make(map[unified.DataSource]SupplementalRecordsProvider),
	}
}

// SetStateProvider sets the state provider for on-demand population.
func (h *ResourceHandlers) SetStateProvider(provider SnapshotProvider) {
	h.stateProvider = provider
}

// SetTenantStateProvider sets the tenant-aware provider.
func (h *ResourceHandlers) SetTenantStateProvider(provider TenantStateProvider) {
	h.tenantStateProvider = provider
}

// SetActionExecutor configures the API-owned action execution driver.
func (h *ResourceHandlers) SetActionExecutor(executor ActionExecutor) {
	h.actionExecutor = executor
}

// SetActionCompletedPublisher configures the terminal action notification hook
// used by the agent SSE bridge. It is intentionally outside the execution
// driver so refused-before-dispatch failures and future executor
// implementations all publish from the API-owned lifecycle boundary.
func (h *ResourceHandlers) SetActionCompletedPublisher(publisher func(unified.ActionAuditRecord)) {
	h.actionCompleted = publisher
}

// SetDiscoveryReadinessProvider wires the canonical discovery-readiness
// projection onto resource responses and Assistant context packs.
func (h *ResourceHandlers) SetDiscoveryReadinessProvider(provider ResourceDiscoveryReadinessProvider) {
	h.discoveryReadiness = provider
}

// SetSupplementalRecordsProvider configures additional records for a source.
func (h *ResourceHandlers) SetSupplementalRecordsProvider(source unified.DataSource, provider SupplementalRecordsProvider) {
	h.supplementalMu.Lock()
	if h.supplementalRecords == nil {
		h.supplementalRecords = make(map[unified.DataSource]SupplementalRecordsProvider)
	}
	if provider == nil {
		delete(h.supplementalRecords, source)
	} else {
		h.supplementalRecords[source] = provider
	}
	h.supplementalMu.Unlock()

	// Provider changes alter ingestion inputs, so clear all cached registries.
	h.cacheMu.Lock()
	h.registryCache = make(map[string]registryCacheEntry)
	h.cacheMu.Unlock()
}

// HandleListResources handles GET /api/resources.
func (h *ResourceHandlers) HandleListResources(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	registry, err := h.buildRegistry(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	allResources := presentationResourcesFromRegistry(registry)
	h.applyActionAvailability(r.Context(), allResources)
	resources := allResources
	if unsupported := unsupportedResourceTypeFilterTokens(r.URL.Query().Get("type")); len(unsupported) > 0 {
		http.Error(w, "unsupported type filter token(s): "+strings.Join(unsupported, ", "), http.StatusBadRequest)
		return
	}

	filters := parseListFilters(r)
	resources = applyFilters(resources, filters)
	applySorting(resources, filters.sortField, filters.sortOrder)

	paged, meta := paginate(resources, filters.page, filters.limit)
	attachDiscoveryTargets(paged)
	h.attachDiscoveryReadinesses(paged, time.Now().UTC())
	attachMetricsTargets(paged, registry)
	paged = unified.RefreshCanonicalMetadataSlice(paged)
	pruneResourcesForListResponse(paged)

	// Build aggregations from the same presentation resource set returned by
	// the list, so top-level host coalescing cannot drift between counts and rows.
	stats := computeResourceContractStats(allResources)
	stats.PolicyPosture = resourcePolicyPostureAggregation(allResources)

	applyResourceContractTypes(paged)

	response := EmptyResourcesResponse()
	response.Data = paged
	response.Meta = meta
	response.Aggregations = stats

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

// HandleStorageSummary handles GET /api/resources/storage-summary.
func (h *ResourceHandlers) HandleStorageSummary(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	registry, err := h.buildRegistry(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	resources := registry.List()
	filters := parseListFilters(r)
	storageSubjects := make([]unified.Resource, 0, len(resources))
	for _, resource := range resources {
		if !isStorageSummaryResource(resource) {
			continue
		}
		storageSubjects = append(storageSubjects, resource)
	}
	storageSubjects = applyFilters(storageSubjects, filters)

	response := buildStorageSummaryResponse(storageSubjects)

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

// HandleStorageIncidents handles GET /api/resources/storage-incidents.
func (h *ResourceHandlers) HandleStorageIncidents(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	registry, err := h.buildRegistry(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	resources := registry.List()
	filters := parseListFilters(r)
	incidentSubjects := make([]unified.Resource, 0, len(resources))
	for _, resource := range resources {
		if !isStorageSummaryResource(resource) || resource.IncidentCount == 0 {
			continue
		}
		incidentSubjects = append(incidentSubjects, resource)
	}
	incidentSubjects = applyFilters(incidentSubjects, filters)

	response := buildStorageIncidentsResponse(incidentSubjects)

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

// pruneResourcesForListResponse removes heavy, platform-specific fields that would bloat
// the list response. Detail drawers can fetch full payloads via GET /api/resources/{id}.
func pruneResourcesForListResponse(resources []unified.Resource) {
	for i := range resources {
		pruneResourceForListResponse(&resources[i])
	}
}

func pruneResourceForListResponse(resource *unified.Resource) {
	if resource == nil {
		return
	}

	// PMG domain stats can be very large; keep summary-only in list.
	if resource.PMG != nil {
		resource.PMG.RelayDomains = nil
		resource.PMG.DomainStats = nil
		resource.PMG.DomainStatsAsOf = time.Time{}
	}
}

// HandleGetResource handles GET /api/resources/{id}.
func (h *ResourceHandlers) HandleGetResource(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	registry, err := h.buildRegistry(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	resourceID := strings.TrimPrefix(r.URL.Path, "/api/resources/")
	resourceID = strings.TrimSuffix(resourceID, "/")
	resourceID = unified.CanonicalResourceID(resourceID)
	if resourceID == "" {
		http.Error(w, "Resource ID required", http.StatusBadRequest)
		return
	}

	resource, ok := presentationResourceByID(registry, resourceID)
	if !ok {
		http.Error(w, "Resource not found", http.StatusNotFound)
		return
	}

	resourceCopy := *resource
	resourceCopies := []unified.Resource{resourceCopy}
	h.applyActionAvailability(r.Context(), resourceCopies)
	resourceCopy = resourceCopies[0]
	attachDiscoveryTarget(&resourceCopy)
	h.attachDiscoveryReadiness(&resourceCopy, time.Now().UTC())
	attachMetricsTarget(&resourceCopy, registry)
	unified.RefreshCanonicalMetadata(&resourceCopy)
	resourceCopy.Type = resourceContractType(resourceCopy)

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

func (h *ResourceHandlers) applyActionAvailability(ctx context.Context, resources []unified.Resource) {
	checker, ok := h.actionExecutor.(ActionAvailabilityChecker)
	if !ok || checker == nil {
		return
	}
	for i := range resources {
		if len(resources[i].Capabilities) == 0 {
			continue
		}
		filtered := make([]unified.ResourceCapability, 0, len(resources[i].Capabilities))
		readinesses := make([]unified.ResourceActionReadiness, 0, len(resources[i].Capabilities))
		for _, capability := range resources[i].Capabilities {
			req := unified.ActionRequest{
				RequestID:      "resource-capability-availability",
				ResourceID:     resources[i].ID,
				CapabilityName: capability.Name,
				Params:         map[string]any{},
				Reason:         "Projecting currently executable resource capabilities.",
				RequestedBy:    "system:resource-api",
			}
			readiness := checker.CheckActionAvailable(ctx, req, resources[i])
			if readiness.Name != "" && !readiness.Available {
				readinesses = append(readinesses, readiness)
				continue
			}
			filtered = append(filtered, capability)
		}
		if len(filtered) == 0 {
			resources[i].Capabilities = nil
		} else {
			resources[i].Capabilities = filtered
		}
		if len(readinesses) > 0 {
			resources[i].ActionReadiness = readinesses
		}
	}
}

func presentationResourcesFromRegistry(registry *unified.ResourceRegistry) []unified.Resource {
	if registry == nil {
		return nil
	}
	return registry.ListForPresentation()
}

func presentationResourceByID(registry *unified.ResourceRegistry, resourceID string) (*unified.Resource, bool) {
	resource, _, ok := presentationResourceByReference(registry, resourceID)
	return resource, ok
}

func presentationResourceByReference(registry *unified.ResourceRegistry, ref string) (*unified.Resource, string, bool) {
	ref = unified.CanonicalResourceID(ref)
	if ref == "" || registry == nil {
		return nil, "", false
	}

	rawResource, resolvedID, ok := registry.GetByReference(ref)
	if !ok {
		return nil, "", false
	}
	for _, resource := range presentationResourcesFromRegistry(registry) {
		if unified.CanonicalResourceID(resource.ID) == resolvedID {
			resourceCopy := resource
			return &resourceCopy, resolvedID, true
		}
	}

	return rawResource, resolvedID, true
}

type resourceFacetCountsResponse = unified.ResourceFacetCounts

type resourceFacetBundleResponse struct {
	ResourceID    string                         `json:"resourceId"`
	Capabilities  []unified.ResourceCapability   `json:"capabilities,omitempty"`
	Relationships []unified.ResourceRelationship `json:"relationships,omitempty"`
	RecentChanges []unified.ResourceChange       `json:"recentChanges"`
	Counts        resourceFacetCountsResponse    `json:"counts"`
}

type resourceTimelineQueryOptions struct {
	since   time.Time
	limit   int
	filters unified.ResourceChangeFilters
}

func parseResourceTimelineQuery(r *http.Request, defaultLimit int, includeRelated bool) (resourceTimelineQueryOptions, string) {
	query := resourceTimelineQueryOptions{
		limit: defaultLimit,
	}

	if raw := strings.TrimSpace(r.URL.Query().Get("since")); raw != "" {
		parsed, parseErr := time.Parse(time.RFC3339, raw)
		if parseErr != nil {
			return query, "Invalid since value"
		}
		query.since = parsed.UTC()
	}
	if raw := strings.TrimSpace(r.URL.Query().Get("limit")); raw != "" {
		parsed, parseErr := strconv.Atoi(raw)
		if parseErr != nil || parsed <= 0 {
			return query, "Invalid limit value"
		}
		query.limit = parsed
	}

	filters, err := unified.ParseResourceChangeFilters(r.URL.Query()["kind"], r.URL.Query()["sourceType"], r.URL.Query()["sourceAdapter"])
	if err != nil {
		return query, err.Error()
	}
	if includeRelated {
		filters.IncludeRelated = true
	}
	query.filters = filters
	return query, ""
}

// HandleResourceRoutes dispatches nested resource routes.
func (h *ResourceHandlers) HandleResourceRoutes(w http.ResponseWriter, r *http.Request) {
	if strings.TrimSuffix(r.URL.Path, "/") == "/api/resources/timeline" {
		h.HandleListResourceTimeline(w, r)
		return
	}
	if strings.HasSuffix(r.URL.Path, "/facets") {
		h.HandleGetResourceFacets(w, r)
		return
	}
	if strings.HasSuffix(r.URL.Path, "/timeline") {
		h.HandleGetResourceTimeline(w, r)
		return
	}
	if strings.HasSuffix(r.URL.Path, "/children") {
		h.HandleGetChildren(w, r)
		return
	}
	if strings.HasSuffix(r.URL.Path, "/metrics") {
		h.HandleGetMetrics(w, r)
		return
	}
	if strings.HasSuffix(r.URL.Path, "/link") {
		h.HandleLink(w, r)
		return
	}
	if strings.HasSuffix(r.URL.Path, "/unlink") {
		h.HandleUnlink(w, r)
		return
	}
	if strings.HasSuffix(r.URL.Path, "/report-merge") {
		h.HandleReportMerge(w, r)
		return
	}
	h.HandleGetResource(w, r)
}

// HandleGetResourceFacets handles GET /api/resources/{id}/facets.
func (h *ResourceHandlers) HandleGetResourceFacets(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	registry, err := h.buildRegistry(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}
	store, err := h.getStore(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	resourceID := strings.TrimPrefix(r.URL.Path, "/api/resources/")
	resourceID = strings.TrimSuffix(resourceID, "/facets")
	resourceID = strings.TrimSuffix(resourceID, "/")
	resourceID = unified.CanonicalResourceID(resourceID)
	if resourceID == "" {
		http.Error(w, "Resource ID required", http.StatusBadRequest)
		return
	}

	resource, ok := registry.Get(resourceID)
	if !ok {
		http.Error(w, "Resource not found", http.StatusNotFound)
		return
	}

	timelineQuery, parseError := parseResourceTimelineQuery(r, 25, true)
	if parseError != "" {
		http.Error(w, parseError, http.StatusBadRequest)
		return
	}
	since := timelineQuery.since
	limit := timelineQuery.limit
	filters := timelineQuery.filters

	recentChanges, err := store.GetRecentChangesFiltered(resourceID, since, limit, filters)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}
	changeCount, err := store.CountRecentChangesFiltered(resourceID, since, filters)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}
	changeKindCounts, err := store.CountRecentChangesByKindFiltered(resourceID, since, filters)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}
	sourceTypeCounts, err := store.CountRecentChangesBySourceTypeFiltered(resourceID, since, filters)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}
	sourceAdapterCounts, err := store.CountRecentChangesBySourceAdapterFiltered(resourceID, since, filters)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(resourceFacetBundleResponse{
		ResourceID:    resourceID,
		Capabilities:  append([]unified.ResourceCapability(nil), resource.Capabilities...),
		Relationships: unified.ResourceRelationshipsWithCanonicalParent(*resource),
		RecentChanges: recentChanges,
		Counts: resourceFacetCountsResponse{
			RecentChanges:              changeCount,
			RecentChangeKinds:          changeKindCounts,
			RecentChangeSourceTypes:    sourceTypeCounts,
			RecentChangeSourceAdapters: sourceAdapterCounts,
		},
	})
}

// HandleGetChildren handles GET /api/resources/{id}/children.
func (h *ResourceHandlers) HandleGetChildren(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	registry, err := h.buildRegistry(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	path := strings.TrimPrefix(r.URL.Path, "/api/resources/")
	path = strings.TrimSuffix(path, "/children")
	path = strings.TrimSuffix(path, "/")
	path = unified.CanonicalResourceID(path)
	if path == "" {
		http.Error(w, "Resource ID required", http.StatusBadRequest)
		return
	}

	children := registry.GetChildren(path)
	attachDiscoveryTargets(children)
	h.attachDiscoveryReadinesses(children, time.Now().UTC())
	children = unified.RefreshCanonicalMetadataSlice(children)
	applyResourceContractTypes(children)
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"data":  children,
		"count": len(children),
	})
}

// HandleGetMetrics handles GET /api/resources/{id}/metrics.
func (h *ResourceHandlers) HandleGetMetrics(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	registry, err := h.buildRegistry(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	path := strings.TrimPrefix(r.URL.Path, "/api/resources/")
	path = strings.TrimSuffix(path, "/metrics")
	path = strings.TrimSuffix(path, "/")
	path = unified.CanonicalResourceID(path)
	if path == "" {
		http.Error(w, "Resource ID required", http.StatusBadRequest)
		return
	}

	resource, ok := registry.Get(path)
	if !ok {
		http.Error(w, "Resource not found", http.StatusNotFound)
		return
	}

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

// HandleListResourceTimeline handles GET /api/resources/timeline.
func (h *ResourceHandlers) HandleListResourceTimeline(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	store, err := h.getStore(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	resourceID := ""
	timelineQuery, parseError := parseResourceTimelineQuery(r, 100, false)
	if parseError != "" {
		http.Error(w, parseError, http.StatusBadRequest)
		return
	}
	since := timelineQuery.since
	limit := timelineQuery.limit
	filters := timelineQuery.filters

	changes, err := store.GetRecentChangesFiltered(resourceID, since, limit, filters)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}
	changeCount, err := store.CountRecentChangesFiltered(resourceID, since, filters)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]any{
		"resourceId":    resourceID,
		"recentChanges": changes,
		"count":         changeCount,
	})
}

// HandleGetResourceTimeline handles GET /api/resources/{id}/timeline.
func (h *ResourceHandlers) HandleGetResourceTimeline(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	store, err := h.getStore(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	resourceID := strings.TrimPrefix(r.URL.Path, "/api/resources/")
	resourceID = strings.TrimSuffix(resourceID, "/timeline")
	resourceID = strings.TrimSuffix(resourceID, "/")
	resourceID = unified.CanonicalResourceID(resourceID)
	if resourceID == "" {
		http.Error(w, "Resource ID required", http.StatusBadRequest)
		return
	}

	timelineQuery, parseError := parseResourceTimelineQuery(r, 100, true)
	if parseError != "" {
		http.Error(w, parseError, http.StatusBadRequest)
		return
	}
	since := timelineQuery.since
	limit := timelineQuery.limit
	filters := timelineQuery.filters

	changes, err := store.GetRecentChangesFiltered(resourceID, since, limit, filters)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}
	changeCount, err := store.CountRecentChangesFiltered(resourceID, since, filters)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]any{
		"resourceId":    resourceID,
		"recentChanges": changes,
		"count":         changeCount,
	})
}

// HandleStats handles GET /api/resources/stats.
func (h *ResourceHandlers) HandleStats(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	registry, err := h.buildRegistry(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	allResources := presentationResourcesFromRegistry(registry)
	stats := computeResourceContractStats(allResources)
	stats.PolicyPosture = resourcePolicyPostureAggregation(allResources)

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

// HandleLink handles POST /api/resources/{id}/link.
func (h *ResourceHandlers) HandleLink(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	store, err := h.getStore(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	path := strings.TrimPrefix(r.URL.Path, "/api/resources/")
	path = strings.TrimSuffix(path, "/link")
	path = strings.TrimSuffix(path, "/")
	path = unified.CanonicalResourceID(path)
	if path == "" {
		http.Error(w, "Resource ID required", http.StatusBadRequest)
		return
	}

	var payload struct {
		TargetID string `json:"targetId"`
		Reason   string `json:"reason"`
	}
	if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
		http.Error(w, "Invalid JSON", http.StatusBadRequest)
		return
	}
	if payload.TargetID == "" {
		http.Error(w, "targetId required", http.StatusBadRequest)
		return
	}
	payload.TargetID = unified.CanonicalResourceID(payload.TargetID)

	link := unified.ResourceLink{
		ResourceA: path,
		ResourceB: payload.TargetID,
		PrimaryID: path,
		Reason:    payload.Reason,
		CreatedBy: getUserID(r),
		CreatedAt: time.Now().UTC(),
	}

	if err := store.AddLink(link); err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}
	h.invalidateCache(orgID)

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]string{
		"status":  "ok",
		"message": "Resources linked",
	})
}

// HandleUnlink handles POST /api/resources/{id}/unlink.
func (h *ResourceHandlers) HandleUnlink(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	store, err := h.getStore(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	path := strings.TrimPrefix(r.URL.Path, "/api/resources/")
	path = strings.TrimSuffix(path, "/unlink")
	path = strings.TrimSuffix(path, "/")
	path = unified.CanonicalResourceID(path)
	if path == "" {
		http.Error(w, "Resource ID required", http.StatusBadRequest)
		return
	}

	var payload struct {
		TargetID string `json:"targetId"`
		Reason   string `json:"reason"`
	}
	if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
		http.Error(w, "Invalid JSON", http.StatusBadRequest)
		return
	}
	if payload.TargetID == "" {
		http.Error(w, "targetId required", http.StatusBadRequest)
		return
	}
	payload.TargetID = unified.CanonicalResourceID(payload.TargetID)

	exclusion := unified.ResourceExclusion{
		ResourceA: path,
		ResourceB: payload.TargetID,
		Reason:    payload.Reason,
		CreatedBy: getUserID(r),
		CreatedAt: time.Now().UTC(),
	}

	if err := store.AddExclusion(exclusion); err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}
	h.invalidateCache(orgID)

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]string{
		"status":  "ok",
		"message": "Resources unlinked",
	})
}

// HandleReportMerge handles POST /api/resources/{id}/report-merge.
func (h *ResourceHandlers) HandleReportMerge(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	orgID := GetOrgID(r.Context())
	store, err := h.getStore(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	path := strings.TrimPrefix(r.URL.Path, "/api/resources/")
	path = strings.TrimSuffix(path, "/report-merge")
	path = strings.TrimSuffix(path, "/")
	path = unified.CanonicalResourceID(path)
	if path == "" {
		http.Error(w, "Resource ID required", http.StatusBadRequest)
		return
	}

	var payload struct {
		Sources []string `json:"sources"`
		Notes   string   `json:"notes"`
	}
	if err := json.NewDecoder(r.Body).Decode(&payload); err != nil && !errors.Is(err, io.EOF) {
		http.Error(w, "Invalid JSON", http.StatusBadRequest)
		return
	}

	registry, err := h.buildRegistry(orgID)
	if err != nil {
		http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
		return
	}

	resource, ok := registry.Get(path)
	if !ok {
		http.Error(w, "Resource not found", http.StatusNotFound)
		return
	}

	if len(resource.Sources) < 2 {
		http.Error(w, "Resource is not merged", http.StatusBadRequest)
		return
	}

	sourceTargets := registry.SourceTargets(path)
	if len(sourceTargets) == 0 {
		http.Error(w, "No source targets found", http.StatusBadRequest)
		return
	}

	filteredSources := make(map[string]struct{})
	for _, source := range payload.Sources {
		filteredSources[strings.ToLower(strings.TrimSpace(source))] = struct{}{}
	}

	reason := strings.TrimSpace(payload.Notes)
	if reason == "" {
		reason = "reported_incorrect_merge"
	}

	exclusionsAdded := 0
	seen := make(map[string]struct{})
	for _, target := range sourceTargets {
		if len(filteredSources) > 0 {
			if _, ok := filteredSources[strings.ToLower(string(target.Source))]; !ok {
				continue
			}
		}
		if target.CandidateID == "" || target.CandidateID == path {
			continue
		}
		key := target.CandidateID
		if _, ok := seen[key]; ok {
			continue
		}
		seen[key] = struct{}{}
		exclusion := unified.ResourceExclusion{
			ResourceA: path,
			ResourceB: target.CandidateID,
			Reason:    reason,
			CreatedBy: getUserID(r),
			CreatedAt: time.Now().UTC(),
		}
		if err := store.AddExclusion(exclusion); err != nil {
			log.Error().
				Err(err).
				Str("orgID", orgID).
				Str("resourceID", path).
				Str("candidateID", target.CandidateID).
				Msg("Failed to add resource merge exclusion")
			http.Error(w, sanitizeErrorForClient(err, "Internal server error"), http.StatusInternalServerError)
			return
		}
		exclusionsAdded += 1
	}

	if exclusionsAdded == 0 {
		http.Error(w, "No exclusions created", http.StatusBadRequest)
		return
	}

	log.Info().
		Str("orgID", orgID).
		Str("resourceID", path).
		Int("exclusionsAdded", exclusionsAdded).
		Str("userID", getUserID(r)).
		Strs("sources", payload.Sources).
		Msg("Reported resource merge issue")
	h.invalidateCache(orgID)

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]any{
		"status":     "ok",
		"message":    "Merge reported",
		"exclusions": exclusionsAdded,
	})
}

// buildRegistry constructs a registry for the current tenant.
func (h *ResourceHandlers) buildRegistry(orgID string) (*unified.ResourceRegistry, error) {
	store, err := h.getStore(orgID)
	if err != nil {
		return nil, err
	}
	key := cacheKey(orgID)

	seed, err := h.registrySeed(orgID)
	if err != nil {
		return nil, err
	}

	h.cacheMu.Lock()
	entry, ok := h.registryCache[key]
	if ok && entry.registry != nil && !seed.lastUpdate.IsZero() && entry.lastUpdate.Equal(seed.lastUpdate) {
		h.cacheMu.Unlock()
		return entry.registry, nil
	}
	h.cacheMu.Unlock()

	h.supplementalMu.RLock()
	supplementalProviders := make(map[unified.DataSource]SupplementalRecordsProvider, len(h.supplementalRecords))
	for source, provider := range h.supplementalRecords {
		supplementalProviders[source] = provider
	}
	h.supplementalMu.RUnlock()

	registry := unified.NewRegistry(store)
	ownedSources := supplementalSnapshotOwnedSources(supplementalProviders, orgID)
	if seed.unifiedSource {
		registry.IngestResources(seed.resources)
		seedSources := unifiedSeedSources(seed.resources)
		for source, provider := range supplementalProviders {
			if provider == nil || !sourceOwnedBySupplementalProvider(source, ownedSources) || unifiedSeedIncludesSource(seedSources, source) {
				continue
			}
			records := supplementalRecordsForOrg(provider, orgID)
			if len(records) == 0 {
				continue
			}
			registry.IngestRecords(source, records)
		}
	} else {
		registry.IngestSnapshot(unified.SnapshotWithoutSources(seed.snapshot, ownedSources))

		for source, provider := range supplementalProviders {
			if provider == nil {
				continue
			}
			records := supplementalRecordsForOrg(provider, orgID)
			if len(records) == 0 {
				continue
			}
			registry.IngestRecords(source, records)
		}
	}

	h.cacheMu.Lock()
	h.registryCache[key] = registryCacheEntry{registry: registry, lastUpdate: seed.lastUpdate}
	h.cacheMu.Unlock()

	return registry, nil
}

func (h *ResourceHandlers) registrySeed(orgID string) (registrySeed, error) {
	seed := registrySeed{}

	if orgID != "" && orgID != "default" {
		if h.tenantStateProvider == nil {
			return seed, errors.New("tenant state provider unavailable")
		}
		resources, lastUpdate := h.tenantStateProvider.UnifiedResourceSnapshotForTenant(orgID)
		seed.resources = resources
		seed.lastUpdate = lastUpdate
		seed.unifiedSource = true
		return seed, nil
	}

	if provider, ok := any(h.stateProvider).(UnifiedResourceSnapshotProvider); ok {
		resources, lastUpdate := provider.UnifiedResourceSnapshot()
		if len(resources) > 0 || !lastUpdate.IsZero() {
			seed.resources = resources
			seed.lastUpdate = lastUpdate
			seed.unifiedSource = true
			return seed, nil
		}
	}

	if h.stateProvider != nil {
		seed.snapshot = h.stateProvider.ReadSnapshot()
		seed.lastUpdate = seed.snapshot.LastUpdate
	}
	return seed, nil
}

func supplementalSnapshotOwnedSources(providers map[unified.DataSource]SupplementalRecordsProvider, orgID string) []unified.DataSource {
	if len(providers) == 0 {
		return nil
	}

	owned := make(map[string]unified.DataSource)
	for _, provider := range providers {
		if provider == nil {
			continue
		}

		var sources []unified.DataSource
		if tenantOwner, ok := any(provider).(TenantSupplementalSnapshotSourceOwner); ok {
			sources = tenantOwner.SnapshotOwnedSourcesForOrg(orgID)
		} else if owner, ok := any(provider).(SupplementalSnapshotSourceOwner); ok {
			sources = owner.SnapshotOwnedSources()
		}

		for _, source := range sources {
			key := strings.ToLower(strings.TrimSpace(string(source)))
			if key == "" {
				continue
			}
			owned[key] = unified.DataSource(key)
		}
	}

	if len(owned) == 0 {
		return nil
	}

	keys := make([]string, 0, len(owned))
	for key := range owned {
		keys = append(keys, key)
	}
	sort.Strings(keys)

	out := make([]unified.DataSource, 0, len(keys))
	for _, key := range keys {
		out = append(out, owned[key])
	}
	return out
}

func supplementalRecordsForOrg(provider SupplementalRecordsProvider, orgID string) []unified.IngestRecord {
	if provider == nil {
		return nil
	}

	var records []unified.IngestRecord
	if tenantProvider, ok := any(provider).(TenantSupplementalRecordsProvider); ok {
		records = tenantProvider.GetCurrentRecordsForOrg(orgID)
	} else {
		records = provider.GetCurrentRecords()
	}
	if len(records) == 0 {
		return nil
	}

	out := make([]unified.IngestRecord, len(records))
	copy(out, records)
	return out
}

func unifiedSeedSources(resources []unified.Resource) map[unified.DataSource]struct{} {
	if len(resources) == 0 {
		return nil
	}

	sources := make(map[unified.DataSource]struct{})
	for _, resource := range resources {
		for _, source := range resource.Sources {
			if normalized := normalizeDataSourceAlias(source); normalized != "" {
				sources[normalized] = struct{}{}
			}
		}
		for source := range resource.SourceStatus {
			if normalized := normalizeDataSourceAlias(source); normalized != "" {
				sources[normalized] = struct{}{}
			}
		}
		switch {
		case resource.TrueNAS != nil:
			sources[unified.SourceTrueNAS] = struct{}{}
		case resource.VMware != nil:
			sources[unified.SourceVMware] = struct{}{}
		case resource.Availability != nil:
			sources[unified.SourceAvailability] = struct{}{}
		}
	}
	return sources
}

func unifiedSeedIncludesSource(seedSources map[unified.DataSource]struct{}, source unified.DataSource) bool {
	if len(seedSources) == 0 {
		return false
	}
	_, ok := seedSources[normalizeDataSourceAlias(source)]
	return ok
}

func sourceOwnedBySupplementalProvider(source unified.DataSource, ownedSources []unified.DataSource) bool {
	normalized := normalizeDataSourceAlias(source)
	if normalized == "" {
		return false
	}
	for _, ownedSource := range ownedSources {
		if normalizeDataSourceAlias(ownedSource) == normalized {
			return true
		}
	}
	return false
}

func normalizeDataSourceAlias(source unified.DataSource) unified.DataSource {
	switch strings.ToLower(strings.TrimSpace(string(source))) {
	case "", "all":
		return ""
	case "k8s":
		return unified.SourceK8s
	case "vmware-vsphere":
		return unified.SourceVMware
	default:
		return unified.DataSource(strings.ToLower(strings.TrimSpace(string(source))))
	}
}

func (h *ResourceHandlers) getStore(orgID string) (unified.ResourceStore, error) {
	h.storeMu.Lock()
	defer h.storeMu.Unlock()
	key := cacheKey(orgID)
	if store, ok := h.stores[key]; ok {
		return store, nil
	}
	dataDir := ""
	if h.cfg != nil {
		dataDir = h.cfg.DataPath
	}
	store, err := unified.NewSQLiteResourceStore(dataDir, key)
	if err != nil {
		return nil, err
	}
	h.stores[key] = store
	return store, nil
}

func (h *ResourceHandlers) invalidateCache(orgID string) {
	key := cacheKey(orgID)
	h.cacheMu.Lock()
	delete(h.registryCache, key)
	h.cacheMu.Unlock()
}

func cacheKey(orgID string) string {
	key := strings.TrimSpace(orgID)
	if key == "" {
		key = "default"
	}
	return key
}

// ResourcesResponse represents the list response for the unified resources API.
type ResourcesResponse struct {
	Data         []unified.Resource    `json:"data"`
	Meta         ResourcesMeta         `json:"meta"`
	Aggregations unified.ResourceStats `json:"aggregations"`
}

func EmptyResourcesResponse() ResourcesResponse {
	return ResourcesResponse{}.NormalizeCollections()
}

func (r ResourcesResponse) NormalizeCollections() ResourcesResponse {
	if r.Data == nil {
		r.Data = []unified.Resource{}
	}
	if r.Aggregations.PolicyPosture == nil {
		r.Aggregations.PolicyPosture = unified.EmptyResourcePolicyPostureSummary()
	} else {
		r.Aggregations.PolicyPosture = r.Aggregations.PolicyPosture.NormalizeCollections()
	}
	if r.Aggregations.ByType == nil {
		r.Aggregations.ByType = map[unified.ResourceType]int{}
	}
	if r.Aggregations.ByStatus == nil {
		r.Aggregations.ByStatus = map[unified.ResourceStatus]int{}
	}
	if r.Aggregations.BySource == nil {
		r.Aggregations.BySource = map[unified.DataSource]int{}
	}
	return r
}

// ResourcesMeta represents pagination metadata.
type ResourcesMeta struct {
	Page       int `json:"page"`
	Limit      int `json:"limit"`
	Total      int `json:"total"`
	TotalPages int `json:"totalPages"`
}

type StorageSummaryResponse struct {
	GeneratedAt            time.Time                `json:"generatedAt"`
	TotalResources         int                      `json:"totalResources"`
	RiskyResources         int                      `json:"riskyResources"`
	CriticalResources      int                      `json:"criticalResources"`
	WarningResources       int                      `json:"warningResources"`
	ProtectionReducedCount int                      `json:"protectionReducedCount"`
	RebuildInProgressCount int                      `json:"rebuildInProgressCount"`
	DependentResourceCount int                      `json:"dependentResourceCount"`
	ProtectedWorkloadCount int                      `json:"protectedWorkloadCount"`
	AffectedDatastoreCount int                      `json:"affectedDatastoreCount"`
	ByPlatform             map[string]int           `json:"byPlatform"`
	ByResourceType         map[string]int           `json:"byResourceType"`
	ByIncidentCategory     map[string]int           `json:"byIncidentCategory"`
	TopIncidents           []StorageSummaryIncident `json:"topIncidents"`
}

func EmptyStorageSummaryResponse() StorageSummaryResponse {
	return StorageSummaryResponse{}.NormalizeCollections()
}

func (r StorageSummaryResponse) NormalizeCollections() StorageSummaryResponse {
	if r.ByPlatform == nil {
		r.ByPlatform = map[string]int{}
	}
	if r.ByResourceType == nil {
		r.ByResourceType = map[string]int{}
	}
	if r.ByIncidentCategory == nil {
		r.ByIncidentCategory = map[string]int{}
	}
	if r.TopIncidents == nil {
		r.TopIncidents = []StorageSummaryIncident{}
	}
	return r
}

type StorageSummaryIncident struct {
	ResourceID            string `json:"resourceId"`
	ResourceType          string `json:"resourceType"`
	Name                  string `json:"name"`
	ParentName            string `json:"parentName,omitempty"`
	Platform              string `json:"platform,omitempty"`
	Topology              string `json:"topology,omitempty"`
	Status                string `json:"status"`
	IncidentCount         int    `json:"incidentCount"`
	IncidentCategory      string `json:"incidentCategory,omitempty"`
	IncidentLabel         string `json:"incidentLabel,omitempty"`
	IncidentSeverity      string `json:"incidentSeverity,omitempty"`
	IncidentPriority      int    `json:"incidentPriority,omitempty"`
	IncidentSummary       string `json:"incidentSummary,omitempty"`
	IncidentImpactSummary string `json:"incidentImpactSummary,omitempty"`
	IncidentUrgency       string `json:"incidentUrgency,omitempty"`
	IncidentAction        string `json:"incidentAction,omitempty"`
	ProtectionReduced     bool   `json:"protectionReduced,omitempty"`
	RebuildInProgress     bool   `json:"rebuildInProgress,omitempty"`
	ConsumerCount         int    `json:"consumerCount,omitempty"`
	ProtectedWorkloads    int    `json:"protectedWorkloads,omitempty"`
	AffectedDatastores    int    `json:"affectedDatastores,omitempty"`
}

type StorageIncidentsResponse struct {
	GeneratedAt       time.Time                `json:"generatedAt"`
	TotalResources    int                      `json:"totalResources"`
	CriticalResources int                      `json:"criticalResources"`
	WarningResources  int                      `json:"warningResources"`
	ByCategory        map[string]int           `json:"byCategory"`
	ByUrgency         map[string]int           `json:"byUrgency"`
	Sections          []StorageIncidentSection `json:"sections"`
}

func EmptyStorageIncidentsResponse() StorageIncidentsResponse {
	return StorageIncidentsResponse{}.NormalizeCollections()
}

func (r StorageIncidentsResponse) NormalizeCollections() StorageIncidentsResponse {
	if r.ByCategory == nil {
		r.ByCategory = map[string]int{}
	}
	if r.ByUrgency == nil {
		r.ByUrgency = map[string]int{}
	}
	if r.Sections == nil {
		r.Sections = []StorageIncidentSection{}
	}
	for i := range r.Sections {
		if r.Sections[i].Resources == nil {
			r.Sections[i].Resources = []StorageSummaryIncident{}
		}
	}
	return r
}

type StorageIncidentSection struct {
	Category          string                   `json:"category"`
	Label             string                   `json:"label"`
	ResourceCount     int                      `json:"resourceCount"`
	CriticalResources int                      `json:"criticalResources"`
	WarningResources  int                      `json:"warningResources"`
	PrimaryUrgency    string                   `json:"primaryUrgency,omitempty"`
	Resources         []StorageSummaryIncident `json:"resources"`
}

type registryCacheEntry struct {
	registry   *unified.ResourceRegistry
	lastUpdate time.Time
}

func buildStorageSummaryResponse(resources []unified.Resource) StorageSummaryResponse {
	response := EmptyStorageSummaryResponse()
	response.GeneratedAt = time.Now().UTC()

	incidentCandidates := make([]unified.Resource, 0, len(resources))
	for _, resource := range resources {
		response.TotalResources++

		platform := storageSummaryPlatform(resource)
		if platform == "" {
			platform = "unknown"
		}
		response.ByPlatform[platform]++
		response.ByResourceType[string(resourceContractType(resource))]++

		if storageSummaryProtectionReduced(resource) {
			response.ProtectionReducedCount++
		}
		if storageSummaryRebuildInProgress(resource) {
			response.RebuildInProgressCount++
		}
		response.DependentResourceCount += storageSummaryConsumerCount(resource)
		response.ProtectedWorkloadCount += storageSummaryProtectedWorkloadCount(resource)
		response.AffectedDatastoreCount += storageSummaryAffectedDatastoreCount(resource)

		if resource.IncidentCount > 0 {
			response.RiskyResources++
			switch resource.IncidentSeverity {
			case storagehealth.RiskCritical:
				response.CriticalResources++
			default:
				response.WarningResources++
			}
			category := strings.TrimSpace(resource.IncidentCategory)
			if category != "" {
				response.ByIncidentCategory[category]++
			}
			incidentCandidates = append(incidentCandidates, resource)
		}
	}

	sort.Slice(incidentCandidates, func(i, j int) bool {
		return storageIncidentLess(incidentCandidates[i], incidentCandidates[j])
	})

	for i, resource := range incidentCandidates {
		if i == 10 {
			break
		}
		response.TopIncidents = append(response.TopIncidents, buildStorageSummaryIncident(resource))
	}

	return response.NormalizeCollections()
}

func buildStorageIncidentsResponse(resources []unified.Resource) StorageIncidentsResponse {
	response := EmptyStorageIncidentsResponse()
	response.GeneratedAt = time.Now().UTC()
	if len(resources) == 0 {
		return response.NormalizeCollections()
	}

	incidentResources := cloneStorageIncidentSubjects(resources)
	sort.Slice(incidentResources, func(i, j int) bool {
		return storageIncidentLess(incidentResources[i], incidentResources[j])
	})

	sectionIndex := make(map[string]int)
	for _, resource := range incidentResources {
		response.TotalResources++
		switch resource.IncidentSeverity {
		case storagehealth.RiskCritical:
			response.CriticalResources++
		default:
			response.WarningResources++
		}

		category := strings.TrimSpace(resource.IncidentCategory)
		if category == "" {
			category = unified.IncidentCategoryHealth
		}
		response.ByCategory[category]++

		urgency := strings.TrimSpace(resource.IncidentUrgency)
		if urgency == "" {
			urgency = unified.IncidentUrgencyPlan
		}
		response.ByUrgency[urgency]++

		idx, ok := sectionIndex[category]
		if !ok {
			response.Sections = append(response.Sections, StorageIncidentSection{
				Category:  category,
				Label:     storageIncidentSectionLabel(category),
				Resources: make([]StorageSummaryIncident, 0, 8),
			})
			idx = len(response.Sections) - 1
			sectionIndex[category] = idx
		}

		section := &response.Sections[idx]
		section.ResourceCount++
		switch resource.IncidentSeverity {
		case storagehealth.RiskCritical:
			section.CriticalResources++
		default:
			section.WarningResources++
		}
		if storageIncidentUrgencyRank(urgency) > storageIncidentUrgencyRank(section.PrimaryUrgency) {
			section.PrimaryUrgency = urgency
		}
		section.Resources = append(section.Resources, buildStorageSummaryIncident(resource))
	}

	sort.SliceStable(response.Sections, func(i, j int) bool {
		left := response.Sections[i]
		right := response.Sections[j]
		if storageIncidentCategoryRank(left.Category) != storageIncidentCategoryRank(right.Category) {
			return storageIncidentCategoryRank(left.Category) < storageIncidentCategoryRank(right.Category)
		}
		if left.CriticalResources != right.CriticalResources {
			return left.CriticalResources > right.CriticalResources
		}
		if left.ResourceCount != right.ResourceCount {
			return left.ResourceCount > right.ResourceCount
		}
		return left.Label < right.Label
	})

	return response.NormalizeCollections()
}

func buildStorageSummaryIncident(resource unified.Resource) StorageSummaryIncident {
	return StorageSummaryIncident{
		ResourceID:            resource.ID,
		ResourceType:          string(resourceContractType(resource)),
		Name:                  resource.Name,
		ParentName:            resource.ParentName,
		Platform:              storageSummaryPlatform(resource),
		Topology:              storageSummaryTopology(resource),
		Status:                string(resource.Status),
		IncidentCount:         resource.IncidentCount,
		IncidentCategory:      resource.IncidentCategory,
		IncidentLabel:         resource.IncidentLabel,
		IncidentSeverity:      string(resource.IncidentSeverity),
		IncidentPriority:      resource.IncidentPriority,
		IncidentSummary:       resource.IncidentSummary,
		IncidentImpactSummary: resource.IncidentImpactSummary,
		IncidentUrgency:       resource.IncidentUrgency,
		IncidentAction:        resource.IncidentAction,
		ProtectionReduced:     storageSummaryProtectionReduced(resource),
		RebuildInProgress:     storageSummaryRebuildInProgress(resource),
		ConsumerCount:         storageSummaryConsumerCount(resource),
		ProtectedWorkloads:    storageSummaryProtectedWorkloadCount(resource),
		AffectedDatastores:    storageSummaryAffectedDatastoreCount(resource),
	}
}

func cloneStorageIncidentSubjects(resources []unified.Resource) []unified.Resource {
	cloned := make([]unified.Resource, len(resources))
	copy(cloned, resources)
	return cloned
}

func storageIncidentLess(left, right unified.Resource) bool {
	if left.IncidentPriority != right.IncidentPriority {
		return left.IncidentPriority > right.IncidentPriority
	}
	if left.IncidentSeverity != right.IncidentSeverity {
		return left.IncidentSeverity > right.IncidentSeverity
	}
	if left.Name != right.Name {
		return left.Name < right.Name
	}
	return left.ID < right.ID
}

func storageIncidentSectionLabel(category string) string {
	switch strings.TrimSpace(category) {
	case unified.IncidentCategoryRecoverability:
		return "Backup & Recoverability"
	case unified.IncidentCategoryProtection:
		return "Protection & Redundancy"
	case unified.IncidentCategoryRebuild:
		return "Rebuild & Recovery"
	case unified.IncidentCategoryCapacity:
		return "Capacity Pressure"
	case unified.IncidentCategoryDiskHealth:
		return "Disk Health"
	case unified.IncidentCategoryAvailability:
		return "Availability"
	default:
		return "Storage Health"
	}
}

func storageIncidentCategoryRank(category string) int {
	switch strings.TrimSpace(category) {
	case unified.IncidentCategoryRecoverability:
		return 1
	case unified.IncidentCategoryProtection:
		return 2
	case unified.IncidentCategoryRebuild:
		return 3
	case unified.IncidentCategoryCapacity:
		return 4
	case unified.IncidentCategoryDiskHealth:
		return 5
	case unified.IncidentCategoryAvailability:
		return 6
	default:
		return 7
	}
}

func storageIncidentUrgencyRank(urgency string) int {
	switch strings.TrimSpace(urgency) {
	case unified.IncidentUrgencyNow:
		return 4
	case unified.IncidentUrgencyToday:
		return 3
	case unified.IncidentUrgencyPlan:
		return 2
	case unified.IncidentUrgencyMonitor:
		return 1
	default:
		return 0
	}
}

func isStorageSummaryResource(resource unified.Resource) bool {
	switch unified.CanonicalResourceType(resource.Type) {
	case unified.ResourceTypeStorage, unified.ResourceTypePhysicalDisk, unified.ResourceTypePBS:
		return true
	case unified.ResourceTypeAgent:
		if resource.TrueNAS != nil {
			return true
		}
		if resource.Agent != nil && (resource.Agent.Unraid != nil || resource.Agent.StorageRisk != nil) {
			return true
		}
	}
	return false
}

func storageSummaryPlatform(resource unified.Resource) string {
	if resource.Storage != nil && strings.TrimSpace(resource.Storage.Platform) != "" {
		return strings.TrimSpace(resource.Storage.Platform)
	}
	if resource.TrueNAS != nil {
		return "truenas"
	}
	if resource.PBS != nil {
		return "pbs"
	}
	if resource.Agent != nil && resource.Agent.Unraid != nil {
		return "unraid"
	}
	for _, source := range resource.Sources {
		if trimmed := strings.TrimSpace(string(source)); trimmed != "" {
			return trimmed
		}
	}
	return ""
}

func storageSummaryTopology(resource unified.Resource) string {
	if resource.Storage != nil && strings.TrimSpace(resource.Storage.Topology) != "" {
		return strings.TrimSpace(resource.Storage.Topology)
	}
	switch unified.CanonicalResourceType(resource.Type) {
	case unified.ResourceTypePhysicalDisk:
		return "disk"
	case unified.ResourceTypePBS:
		return "backup-server"
	case unified.ResourceTypeAgent:
		if resource.Agent != nil && resource.Agent.Unraid != nil {
			return "array-host"
		}
		if resource.TrueNAS != nil {
			return "nas"
		}
	}
	return string(resourceContractType(resource))
}

func storageSummaryProtectionReduced(resource unified.Resource) bool {
	if resource.Storage != nil && resource.Storage.ProtectionReduced {
		return true
	}
	if resource.Agent != nil && resource.Agent.ProtectionReduced {
		return true
	}
	if resource.TrueNAS != nil && resource.TrueNAS.ProtectionReduced {
		return true
	}
	return false
}

func storageSummaryRebuildInProgress(resource unified.Resource) bool {
	if resource.Storage != nil && resource.Storage.RebuildInProgress {
		return true
	}
	if resource.Agent != nil && resource.Agent.RebuildInProgress {
		return true
	}
	if resource.TrueNAS != nil && resource.TrueNAS.RebuildInProgress {
		return true
	}
	return false
}

func storageSummaryConsumerCount(resource unified.Resource) int {
	if resource.Storage != nil {
		return resource.Storage.ConsumerCount
	}
	return 0
}

func storageSummaryProtectedWorkloadCount(resource unified.Resource) int {
	if resource.PBS != nil {
		return resource.PBS.ProtectedWorkloadCount
	}
	return 0
}

func storageSummaryAffectedDatastoreCount(resource unified.Resource) int {
	if resource.PBS != nil {
		return resource.PBS.AffectedDatastoreCount
	}
	return 0
}

// Filtering helpers.
type listFilters struct {
	types     map[unified.ResourceType]struct{}
	sources   map[unified.DataSource]struct{}
	statuses  map[unified.ResourceStatus]struct{}
	parent    string
	cluster   string
	namespace string
	query     string
	tags      map[string]struct{}
	page      int
	limit     int
	sortField string
	sortOrder string
}

func parseListFilters(r *http.Request) listFilters {
	filters := listFilters{
		types:     parseResourceTypes(r.URL.Query().Get("type")),
		sources:   parseSources(r.URL.Query().Get("source")),
		statuses:  parseStatuses(r.URL.Query().Get("status")),
		parent:    strings.TrimSpace(r.URL.Query().Get("parent")),
		cluster:   strings.TrimSpace(r.URL.Query().Get("cluster")),
		namespace: strings.TrimSpace(r.URL.Query().Get("namespace")),
		query:     strings.TrimSpace(strings.ToLower(r.URL.Query().Get("q"))),
		tags:      parseTags(r.URL.Query().Get("tags")),
		page:      parseIntDefault(r.URL.Query().Get("page"), 1),
		limit:     parseIntDefault(r.URL.Query().Get("limit"), 50),
		sortField: strings.TrimSpace(r.URL.Query().Get("sort")),
		sortOrder: strings.TrimSpace(strings.ToLower(r.URL.Query().Get("order"))),
	}
	if filters.page < 1 {
		filters.page = 1
	}
	if filters.limit < 1 {
		filters.limit = 50
	}
	if filters.limit > 100 {
		filters.limit = 100
	}
	if filters.sortField == "" {
		filters.sortField = "name"
	}
	if filters.sortOrder != "desc" {
		filters.sortOrder = "asc"
	}
	return filters
}

func applyFilters(resources []unified.Resource, filters listFilters) []unified.Resource {
	out := make([]unified.Resource, 0, len(resources))
	for _, r := range resources {
		if len(filters.types) > 0 {
			if _, ok := filters.types[resourceContractType(r)]; !ok {
				continue
			}
		}
		if len(filters.sources) > 0 {
			matched := false
			for _, source := range r.Sources {
				if _, ok := filters.sources[source]; ok {
					matched = true
					break
				}
			}
			if !matched {
				continue
			}
		}
		if len(filters.statuses) > 0 {
			if _, ok := filters.statuses[r.Status]; !ok {
				continue
			}
		}
		if filters.parent != "" {
			if r.ParentID == nil || *r.ParentID != filters.parent {
				continue
			}
		}
		if filters.cluster != "" {
			cluster := strings.ToLower(filters.cluster)
			identityCluster := strings.ToLower(r.Identity.ClusterName)
			proxmoxCluster := ""
			if r.Proxmox != nil {
				proxmoxCluster = strings.ToLower(r.Proxmox.ClusterName)
			}
			dockerSwarmClusterName := ""
			dockerSwarmClusterID := ""
			if r.Docker != nil && r.Docker.Swarm != nil {
				dockerSwarmClusterName = strings.ToLower(strings.TrimSpace(r.Docker.Swarm.ClusterName))
				dockerSwarmClusterID = strings.ToLower(strings.TrimSpace(r.Docker.Swarm.ClusterID))
			}

			if identityCluster != cluster && proxmoxCluster != cluster && dockerSwarmClusterName != cluster && dockerSwarmClusterID != cluster {
				continue
			}
		}
		if filters.namespace != "" {
			if r.Kubernetes == nil {
				continue
			}
			want := strings.ToLower(filters.namespace)
			got := strings.ToLower(strings.TrimSpace(r.Kubernetes.Namespace))
			if got != want {
				continue
			}
		}
		if filters.query != "" {
			name := strings.ToLower(r.Name)
			if !strings.Contains(name, filters.query) {
				continue
			}
		}
		if len(filters.tags) > 0 {
			matched := false
			for _, tag := range r.Tags {
				if _, ok := filters.tags[strings.ToLower(tag)]; ok {
					matched = true
					break
				}
			}
			if !matched {
				continue
			}
		}
		out = append(out, r)
	}
	return out
}

func applySorting(resources []unified.Resource, field, order string) {
	sort.SliceStable(resources, func(i, j int) bool {
		a := resources[i]
		b := resources[j]
		comparison := 0
		switch field {
		case "status":
			comparison = strings.Compare(string(a.Status), string(b.Status))
		case "type":
			comparison = strings.Compare(string(a.Type), string(b.Type))
		case "lastSeen":
			if a.LastSeen.Before(b.LastSeen) {
				comparison = -1
			} else if b.LastSeen.Before(a.LastSeen) {
				comparison = 1
			}
		default:
			comparison = unified.CompareResourcesByCanonicalName(a, b)
		}
		if comparison == 0 {
			comparison = unified.CompareResourcesByCanonicalName(a, b)
		}
		if order == "desc" {
			return comparison > 0
		}
		return comparison < 0
	})
}

func paginate(resources []unified.Resource, page, limit int) ([]unified.Resource, ResourcesMeta) {
	total := len(resources)
	start := (page - 1) * limit
	if start > total {
		start = total
	}
	end := start + limit
	if end > total {
		end = total
	}

	paged := resources[start:end]
	totalPages := total / limit
	if total%limit != 0 {
		totalPages++
	}
	meta := ResourcesMeta{
		Page:       page,
		Limit:      limit,
		Total:      total,
		TotalPages: totalPages,
	}
	return paged, meta
}

func parseResourceTypes(raw string) map[unified.ResourceType]struct{} {
	result := make(map[unified.ResourceType]struct{})
	for _, part := range splitCSV(raw) {
		for _, resourceType := range resourceTypeFilterAdapter(part) {
			result[resourceType] = struct{}{}
		}
	}
	return result
}

func unsupportedResourceTypeFilterTokens(raw string) []string {
	if strings.TrimSpace(raw) == "" {
		return nil
	}
	var unsupported []string
	for _, part := range splitCSV(raw) {
		if !isSupportedResourceTypeFilterToken(part) {
			unsupported = append(unsupported, part)
		}
	}
	return unsupported
}

func isSupportedResourceTypeFilterToken(token string) bool {
	return len(resourceTypeFilterAdapter(token)) > 0
}

func resourceTypeFilterAdapter(token string) []unified.ResourceType {
	switch token {
	case "agent", "agents", "node", "nodes":
		return []unified.ResourceType{unified.ResourceTypeAgent}
	case "docker-host":
		return []unified.ResourceType{"docker-host"}
	case "docker-image", "docker-images":
		return []unified.ResourceType{unified.ResourceTypeDockerImage}
	case "docker-volume", "docker-volumes":
		return []unified.ResourceType{unified.ResourceTypeDockerVolume}
	case "docker-network", "docker-networks":
		return []unified.ResourceType{unified.ResourceTypeDockerNetwork}
	case "docker-task", "docker-tasks":
		return []unified.ResourceType{unified.ResourceTypeDockerTask}
	case "docker-swarm-node", "docker-swarm-nodes", "docker-node", "docker-nodes", "swarm-node", "swarm-nodes":
		return []unified.ResourceType{unified.ResourceTypeDockerSwarmNode}
	case "docker-secret", "docker-secrets", "swarm-secret", "swarm-secrets":
		return []unified.ResourceType{unified.ResourceTypeDockerSecret}
	case "docker-config", "docker-configs", "swarm-config", "swarm-configs":
		return []unified.ResourceType{unified.ResourceTypeDockerConfig}
	case "vm", "vms":
		return []unified.ResourceType{unified.ResourceTypeVM}
	case "system-container", "system-containers", "oci-container":
		return []unified.ResourceType{unified.ResourceTypeSystemContainer}
	case "app-container", "app-containers":
		return []unified.ResourceType{unified.ResourceTypeAppContainer}
	case "docker-service", "service", "services":
		return []unified.ResourceType{unified.ResourceTypeDockerService}
	case "pod", "pods":
		return []unified.ResourceType{unified.ResourceTypePod}
	case "k8s-cluster", "k8s-clusters":
		return []unified.ResourceType{unified.ResourceTypeK8sCluster}
	case "k8s-node", "k8s-nodes":
		return []unified.ResourceType{unified.ResourceTypeK8sNode}
	case "k8s-deployment", "k8s-deployments":
		return []unified.ResourceType{unified.ResourceTypeK8sDeployment}
	case "k8s-replicaset", "k8s-replicasets":
		return []unified.ResourceType{unified.ResourceTypeK8sReplicaSet}
	case "k8s-namespace", "k8s-namespaces":
		return []unified.ResourceType{unified.ResourceTypeK8sNamespace}
	case "k8s-service", "k8s-services":
		return []unified.ResourceType{unified.ResourceTypeK8sService}
	case "k8s-statefulset", "k8s-statefulsets":
		return []unified.ResourceType{unified.ResourceTypeK8sStatefulSet}
	case "k8s-daemonset", "k8s-daemonsets":
		return []unified.ResourceType{unified.ResourceTypeK8sDaemonSet}
	case "k8s-job", "k8s-jobs":
		return []unified.ResourceType{unified.ResourceTypeK8sJob}
	case "k8s-cronjob", "k8s-cronjobs":
		return []unified.ResourceType{unified.ResourceTypeK8sCronJob}
	case "k8s-ingress", "k8s-ingresses":
		return []unified.ResourceType{unified.ResourceTypeK8sIngress}
	case "k8s-endpoint-slice", "k8s-endpoint-slices":
		return []unified.ResourceType{unified.ResourceTypeK8sEndpointSlice}
	case "k8s-network-policy", "k8s-network-policies":
		return []unified.ResourceType{unified.ResourceTypeK8sNetworkPolicy}
	case "k8s-persistent-volume", "k8s-persistent-volumes":
		return []unified.ResourceType{unified.ResourceTypeK8sPV}
	case "k8s-persistent-volume-claim", "k8s-persistent-volume-claims":
		return []unified.ResourceType{unified.ResourceTypeK8sPVC}
	case "k8s-storage-class", "k8s-storage-classes":
		return []unified.ResourceType{unified.ResourceTypeK8sStorageClass}
	case "k8s-configmap", "k8s-configmaps":
		return []unified.ResourceType{unified.ResourceTypeK8sConfigMap}
	case "k8s-secret", "k8s-secrets":
		return []unified.ResourceType{unified.ResourceTypeK8sSecret}
	case "k8s-serviceaccount", "k8s-serviceaccounts":
		return []unified.ResourceType{unified.ResourceTypeK8sServiceAccount}
	case "k8s-role", "k8s-roles":
		return []unified.ResourceType{unified.ResourceTypeK8sRole}
	case "k8s-cluster-role", "k8s-cluster-roles":
		return []unified.ResourceType{unified.ResourceTypeK8sClusterRole}
	case "k8s-role-binding", "k8s-role-bindings":
		return []unified.ResourceType{unified.ResourceTypeK8sRoleBinding}
	case "k8s-cluster-role-binding", "k8s-cluster-role-bindings":
		return []unified.ResourceType{unified.ResourceTypeK8sClusterRoleBinding}
	case "k8s-resource-quota", "k8s-resource-quotas":
		return []unified.ResourceType{unified.ResourceTypeK8sResourceQuota}
	case "k8s-limit-range", "k8s-limit-ranges":
		return []unified.ResourceType{unified.ResourceTypeK8sLimitRange}
	case "k8s-pod-disruption-budget", "k8s-pod-disruption-budgets":
		return []unified.ResourceType{unified.ResourceTypeK8sPDB}
	case "k8s-horizontal-pod-autoscaler", "k8s-horizontal-pod-autoscalers", "k8s-hpa", "k8s-hpas":
		return []unified.ResourceType{unified.ResourceTypeK8sHPA}
	case "k8s-event", "k8s-events":
		return []unified.ResourceType{unified.ResourceTypeK8sEvent}
	case "storage":
		return []unified.ResourceType{unified.ResourceTypeStorage}
	case "network", "networks":
		return []unified.ResourceType{unified.ResourceTypeNetwork}
	case "pbs":
		return []unified.ResourceType{unified.ResourceTypePBS}
	case "pmg":
		return []unified.ResourceType{unified.ResourceTypePMG}
	case "ceph", "pool":
		return []unified.ResourceType{unified.ResourceTypeCeph}
	case "physical_disk", "physical-disk", "physicaldisk", "disk":
		return []unified.ResourceType{unified.ResourceTypePhysicalDisk}
	case "network-share", "network-shares", "share", "shares":
		return []unified.ResourceType{unified.ResourceTypeNetworkShare}
	case "network-endpoint", "network-endpoints", "endpoint", "endpoints", "availability":
		return []unified.ResourceType{unified.ResourceTypeNetworkEndpoint}
	default:
		return nil
	}
}

func parseSources(raw string) map[unified.DataSource]struct{} {
	result := make(map[unified.DataSource]struct{})
	for _, part := range splitCSV(raw) {
		switch part {
		case "proxmox":
			result[unified.SourceProxmox] = struct{}{}
		case "agent":
			result[unified.SourceAgent] = struct{}{}
		case "docker":
			result[unified.SourceDocker] = struct{}{}
		case "pbs":
			result[unified.SourcePBS] = struct{}{}
		case "pmg":
			result[unified.SourcePMG] = struct{}{}
		case "kubernetes":
			result[unified.SourceK8s] = struct{}{}
		case "truenas":
			result[unified.SourceTrueNAS] = struct{}{}
		case "vmware", "vmware-vsphere":
			result[unified.SourceVMware] = struct{}{}
		case "availability":
			result[unified.SourceAvailability] = struct{}{}
		}
	}
	return result
}

func parseStatuses(raw string) map[unified.ResourceStatus]struct{} {
	result := make(map[unified.ResourceStatus]struct{})
	for _, part := range splitCSV(raw) {
		switch part {
		case "online":
			result[unified.StatusOnline] = struct{}{}
		case "offline":
			result[unified.StatusOffline] = struct{}{}
		case "warning":
			result[unified.StatusWarning] = struct{}{}
		case "unknown":
			result[unified.StatusUnknown] = struct{}{}
		}
	}
	return result
}

func parseTags(raw string) map[string]struct{} {
	result := make(map[string]struct{})
	for _, part := range splitCSV(raw) {
		if part == "" {
			continue
		}
		result[strings.ToLower(part)] = struct{}{}
	}
	return result
}

func attachDiscoveryTargets(resources []unified.Resource) {
	for i := range resources {
		attachDiscoveryTarget(&resources[i])
	}
}

func attachDiscoveryTarget(resource *unified.Resource) {
	if resource == nil {
		return
	}
	if target := buildDiscoveryTarget(*resource); target != nil {
		resource.DiscoveryTarget = target
	}
}

func (h *ResourceHandlers) attachDiscoveryReadinesses(resources []unified.Resource, now time.Time) {
	if h == nil || h.discoveryReadiness == nil {
		return
	}
	for i := range resources {
		h.attachDiscoveryReadiness(&resources[i], now)
	}
}

func (h *ResourceHandlers) attachDiscoveryReadiness(resource *unified.Resource, now time.Time) {
	if h == nil || h.discoveryReadiness == nil || resource == nil {
		return
	}
	readiness := h.discoveryReadiness.DiscoveryReadinessForResource(*resource, now)
	if readiness.State == "" {
		return
	}
	resource.DiscoveryReadiness = &readiness
}

func attachMetricsTargets(resources []unified.Resource, registry *unified.ResourceRegistry) {
	for i := range resources {
		attachMetricsTarget(&resources[i], registry)
	}
}

func attachMetricsTarget(resource *unified.Resource, registry *unified.ResourceRegistry) {
	if resource == nil || registry == nil {
		return
	}
	resource.MetricsTarget = registry.MetricsTarget(resource.ID)
}

// resourceContractType maps internal unified resource shapes onto the canonical
// REST resource-type contract without exposing legacy aliases.
func resourceContractType(r unified.Resource) unified.ResourceType {
	return unified.ContractResourceType(r)
}

// applyResourceContractTypes rewrites Type fields on the response slice so the
// REST API exposes the canonical resource-type contract.
func applyResourceContractTypes(resources []unified.Resource) {
	for i := range resources {
		resources[i].Type = resourceContractType(resources[i])
	}
}

// computeResourceContractByType builds the ByType aggregation using the
// canonical REST resource-type contract. Does not mutate the input slice.
func computeResourceContractByType(resources []unified.Resource) map[unified.ResourceType]int {
	m := make(map[unified.ResourceType]int, 8)
	for _, r := range resources {
		m[resourceContractType(r)]++
	}
	return m
}

func computeResourceContractStats(resources []unified.Resource) unified.ResourceStats {
	stats := unified.ResourceStats{
		Total:    len(resources),
		ByType:   make(map[unified.ResourceType]int, 8),
		ByStatus: make(map[unified.ResourceStatus]int, 8),
		BySource: make(map[unified.DataSource]int, 8),
	}
	for _, resource := range resources {
		stats.ByType[resourceContractType(resource)]++
		stats.ByStatus[resource.Status]++
		for _, source := range resource.Sources {
			stats.BySource[source]++
		}
	}
	return stats
}

func resourcePolicyPostureAggregation(resources []unified.Resource) *unified.ResourcePolicyPostureSummary {
	canonicalResources := unified.RefreshCanonicalMetadataSlice(resources)
	return unified.ResourcePolicyPostureContract(unified.SummarizePolicyPosture(canonicalResources))
}

func buildDiscoveryTarget(resource unified.Resource) *unified.DiscoveryTarget {
	switch unified.CanonicalResourceType(resource.Type) {
	case unified.ResourceTypeAgent:
		return hostDiscoveryTarget(resource)
	case unified.ResourceTypeVM:
		return proxmoxGuestDiscoveryTarget(resource, "vm")
	case unified.ResourceTypeSystemContainer:
		return proxmoxGuestDiscoveryTarget(resource, "system-container")
	case unified.ResourceTypeAppContainer:
		return dockerContainerDiscoveryTarget(resource)
	case unified.ResourceTypePBS:
		return hostDiscoveryTarget(resource)
	case unified.ResourceTypePMG:
		return hostDiscoveryTarget(resource)
	case unified.ResourceTypeCeph:
		return cephDiscoveryTarget(resource)
	case unified.ResourceTypeK8sCluster:
		return kubernetesDiscoveryTarget(resource)
	case unified.ResourceTypeK8sNode:
		return kubernetesDiscoveryTarget(resource)
	case unified.ResourceTypePod:
		return kubernetesDiscoveryTarget(resource)
	case unified.ResourceTypeK8sDeployment:
		return kubernetesDiscoveryTarget(resource)
	case unified.ResourceTypePhysicalDisk:
		return physicalDiskDiscoveryTarget(resource)
	default:
		return nil
	}
}

func cephDiscoveryTarget(resource unified.Resource) *unified.DiscoveryTarget {
	if resource.Ceph == nil {
		return nil
	}
	hostID := firstNonEmptyTrimmed(
		resource.Ceph.FSID,
		resource.Name,
		resource.ID,
	)
	if hostID == "" {
		return nil
	}
	return &unified.DiscoveryTarget{
		ResourceType: "ceph",
		AgentID:      hostID,
		ResourceID:   resource.ID,
		Hostname:     resource.Name,
	}
}

func hostDiscoveryTarget(resource unified.Resource) *unified.DiscoveryTarget {
	linkedAgentID := ""
	agentBacked := hasSource(resource.Sources, unified.SourceAgent) || resource.Agent != nil
	if agentBacked {
		linkedAgentID = proxmoxLinkedAgentID(resource.Proxmox)
	}
	if linkedAgentID != "" {
		agentBacked = true
	}
	hostID := firstNonEmptyTrimmed(
		agentID(resource.Agent),
		linkedAgentID,
		dockerAgentID(resource.Docker),
		proxmoxNodeName(resource.Proxmox),
		agentHostname(resource.Agent),
		dockerHostname(resource.Docker),
		pbsHostname(resource.PBS),
		pmgHostname(resource.PMG),
		firstResourceHostname(resource),
		resource.Name,
		resource.ID,
	)
	if hostID == "" {
		return nil
	}
	return &unified.DiscoveryTarget{
		ResourceType: "agent",
		AgentID:      hostID,
		ResourceID:   hostID,
		Hostname: firstNonEmptyTrimmed(
			agentHostname(resource.Agent),
			proxmoxNodeName(resource.Proxmox),
			dockerHostname(resource.Docker),
			pbsHostname(resource.PBS),
			pmgHostname(resource.PMG),
			firstResourceHostname(resource),
			resource.Name,
			hostID,
		),
	}
}

func dockerContainerDiscoveryTarget(resource unified.Resource) *unified.DiscoveryTarget {
	if resource.Docker == nil {
		return nil
	}
	hostID := strings.TrimSpace(resource.Docker.AgentID)
	if hostID == "" {
		return nil
	}
	resourceID := firstNonEmptyTrimmed(
		resource.Name,
		resource.Docker.ContainerID,
		resource.ID,
	)
	if resourceID == "" {
		return nil
	}
	return &unified.DiscoveryTarget{
		ResourceType: "app-container",
		AgentID:      hostID,
		ResourceID:   resourceID,
		Hostname: firstNonEmptyTrimmed(
			resource.Docker.Hostname,
			firstResourceHostname(resource),
			resource.Name,
		),
	}
}

func proxmoxGuestDiscoveryTarget(resource unified.Resource, resourceType string) *unified.DiscoveryTarget {
	if resource.Proxmox == nil || resource.Proxmox.NodeName == "" || resource.Proxmox.VMID == 0 {
		return nil
	}
	resourceID := strconv.Itoa(resource.Proxmox.VMID)
	hostID := proxmoxLinkedAgentID(resource.Proxmox)
	if hostID == "" || resourceID == "" {
		return nil
	}
	return &unified.DiscoveryTarget{
		ResourceType: string(resourceType),
		AgentID:      hostID,
		ResourceID:   resourceID,
		Hostname: firstNonEmptyTrimmed(
			firstResourceHostname(resource),
			resource.Name,
			resourceID,
		),
	}
}

func kubernetesDiscoveryTarget(resource unified.Resource) *unified.DiscoveryTarget {
	if resource.Kubernetes == nil {
		return nil
	}
	resourceType := unified.CanonicalResourceType(resource.Type)

	hostID := firstNonEmptyTrimmed(
		resource.Kubernetes.AgentID,
		resource.Kubernetes.ClusterID,
		resource.Kubernetes.ClusterName,
	)
	if hostID == "" {
		return nil
	}

	resourceID := ""
	switch resourceType {
	case unified.ResourceTypeK8sCluster:
		resourceID = firstNonEmptyTrimmed(
			resource.Kubernetes.ClusterID,
			resource.Kubernetes.ClusterName,
			resource.Name,
		)
	case unified.ResourceTypeK8sNode:
		resourceID = firstNonEmptyTrimmed(
			resource.Kubernetes.NodeUID,
			resource.Kubernetes.NodeName,
			resource.Name,
		)
	case unified.ResourceTypeK8sDeployment:
		resourceID = firstNonEmptyTrimmed(
			resource.Kubernetes.DeploymentUID,
			kubernetesNamespacedName(resource.Kubernetes.Namespace, resource.Name),
			resource.Name,
		)
	case unified.ResourceTypePod:
		resourceID = firstNonEmptyTrimmed(
			resource.Kubernetes.PodUID,
			kubernetesNamespacedName(resource.Kubernetes.Namespace, resource.Name),
			resource.Name,
		)
	default:
		return nil
	}
	if resourceID == "" {
		return nil
	}

	return &unified.DiscoveryTarget{
		ResourceType: string(resourceType),
		AgentID:      hostID,
		ResourceID:   resourceID,
		Hostname: firstNonEmptyTrimmed(
			resource.Kubernetes.ClusterName,
			resource.Kubernetes.Context,
			resource.Name,
		),
	}
}

func physicalDiskDiscoveryTarget(resource unified.Resource) *unified.DiscoveryTarget {
	if resource.PhysicalDisk == nil {
		return nil
	}
	hostID := ""
	if resource.Proxmox != nil {
		hostID = resource.Proxmox.NodeName
	}
	if hostID == "" {
		hostID = firstNonEmptyTrimmed(firstResourceHostname(resource), resource.Name)
	}
	if hostID == "" {
		return nil
	}
	return &unified.DiscoveryTarget{
		ResourceType: "disk",
		AgentID:      hostID,
		ResourceID:   resource.ID,
		Hostname:     hostID,
	}
}

func kubernetesNamespacedName(namespace, name string) string {
	ns := strings.TrimSpace(namespace)
	n := strings.TrimSpace(name)
	if ns == "" {
		return n
	}
	if n == "" {
		return ns
	}
	return ns + "/" + n
}

func firstResourceHostname(resource unified.Resource) string {
	for _, hostname := range resource.Identity.Hostnames {
		trimmed := strings.TrimSpace(hostname)
		if trimmed != "" {
			return trimmed
		}
	}
	return ""
}

func firstNonEmptyTrimmed(values ...string) string {
	for _, value := range values {
		trimmed := strings.TrimSpace(value)
		if trimmed != "" {
			return trimmed
		}
	}
	return ""
}

func hasSource(sources []unified.DataSource, target unified.DataSource) bool {
	for _, source := range sources {
		if source == target {
			return true
		}
	}
	return false
}

func agentID(agent *unified.AgentData) string {
	if agent == nil {
		return ""
	}
	return agent.AgentID
}

func dockerAgentID(docker *unified.DockerData) string {
	if docker == nil {
		return ""
	}
	return docker.AgentID
}

func agentHostname(agent *unified.AgentData) string {
	if agent == nil {
		return ""
	}
	return agent.Hostname
}

func proxmoxLinkedAgentID(proxmox *unified.ProxmoxData) string {
	if proxmox == nil {
		return ""
	}
	return proxmox.LinkedAgentID
}

func proxmoxNodeName(proxmox *unified.ProxmoxData) string {
	if proxmox == nil {
		return ""
	}
	return proxmox.NodeName
}

func dockerHostname(docker *unified.DockerData) string {
	if docker == nil {
		return ""
	}
	return docker.Hostname
}

func pbsHostname(pbs *unified.PBSData) string {
	if pbs == nil {
		return ""
	}
	return pbs.Hostname
}

func pmgHostname(pmg *unified.PMGData) string {
	if pmg == nil {
		return ""
	}
	return pmg.Hostname
}

func splitCSV(raw string) []string {
	raw = strings.NewReplacer("%2c", ",", "%2C", ",").Replace(raw)
	parts := strings.Split(raw, ",")
	out := make([]string, 0, len(parts))
	for _, part := range parts {
		part = strings.TrimSpace(strings.ToLower(part))
		if part == "" {
			continue
		}
		out = append(out, part)
	}
	return out
}

func parseIntDefault(raw string, def int) int {
	if raw == "" {
		return def
	}
	val, err := strconv.Atoi(raw)
	if err != nil {
		return def
	}
	return val
}

// getUserID attempts to resolve the user ID for auditing.
func getUserID(r *http.Request) string {
	return auth.GetUser(r.Context())
}