package handlers

import (
	"bookhoard/internal/database"
	"bookhoard/internal/services"
	wsync "bookhoard/internal/sync"
	"context"
	"fmt"
	"net/http"
	"strconv"
	"sync"
	"time"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgtype"
	"github.com/labstack/echo/v4"
)

const (
	maxPaginationLimit = 1000
)

type Handler struct {
	db                *database.Queries
	scanner           *services.EbookScanner
	worker            *services.Worker
	scheduler         *services.Scheduler
	ctx               context.Context
	cancel            context.CancelFunc
	mu                sync.Mutex
	watchModeCtx      context.Context
	watchModeCancel   context.CancelFunc
	watchingLibraries map[string]bool
	connManager       *wsync.ConnectionManager
}

func NewHandler(db *database.Queries, connManager *wsync.ConnectionManager) *Handler {
	ctx, cancel := context.WithCancel(context.Background())
	worker := services.NewWorker(3)
	scheduler := services.NewScheduler(worker, db)

	watchCtx, watchCancel := context.WithCancel(context.Background())

	return &Handler{
		db:                db,
		scanner:           services.NewEbookScanner(db),
		worker:            worker,
		scheduler:         scheduler,
		ctx:               ctx,
		cancel:            cancel,
		watchModeCtx:      watchCtx,
		watchModeCancel:   watchCancel,
		watchingLibraries: make(map[string]bool),
		connManager:       connManager,
	}
}

// parseDate parses a date string in YYYY-MM-DD format
func parseDate(dateStr string) time.Time {
	if dateStr == "" {
		return time.Time{}
	}
	if t, err := time.Parse("2006-01-02", dateStr); err == nil {
		return t
	}
	return time.Time{}
}

func SetupRoutes(g *echo.Group, db *database.Queries, connManager *wsync.ConnectionManager) *Handler {
	h := NewHandler(db, connManager)

	// Collections API routes
	collectionHandler := NewCollectionHandler(db, connManager)
	collections := g.Group("/collections")
	collections.GET("", collectionHandler.GetCollections)
	collections.POST("", collectionHandler.CreateCollection)
	collections.GET("/:id", collectionHandler.GetCollection)
	collections.PUT("/:id", collectionHandler.UpdateCollection)
	collections.DELETE("/:id", collectionHandler.DeleteCollection)
	collections.GET("/:id/books", collectionHandler.GetBookCollections)
	collections.POST("/:id/books", collectionHandler.AddBooks)
	collections.DELETE("/:id/books/:bookId", collectionHandler.RemoveBook)
	collections.POST("/:id/books/bulk-remove", collectionHandler.BulkRemoveBooks)
	collections.POST("/bulk-add-books", collectionHandler.HandleBulkAddBooks)
	collections.POST("/test-rules", collectionHandler.TestRules)

	// Device shelf mapping routes
	deviceCollections := g.Group("/devices/:id/collections")
	deviceCollections.GET("", collectionHandler.GetDeviceMappings)
	deviceCollections.POST("", collectionHandler.CreateDeviceMapping)
	deviceCollections.PUT("/:collectionId", collectionHandler.UpdateDeviceMapping)
	deviceCollections.DELETE("/:collectionId", collectionHandler.DeleteDeviceMapping)

	// Book matching and linking routes
	g.POST("/sync/books/query", h.QueryBooks)
	g.POST("/devices/:deviceId/sync/link-book", h.LinkBook)
	g.GET("/devices/:deviceId/sync/unlinked-books", h.GetUnlinkedBooks)
	g.GET("/devices/:id/file-aliases", h.GetDeviceFileAliases)
	g.POST("/devices/:id/file-aliases", h.CreateDeviceFileAlias)
	g.PUT("/devices/:id/file-aliases/:aliasId", h.UpdateDeviceFileAlias)
	g.DELETE("/devices/:id/file-aliases/:aliasId", h.DeleteDeviceFileAlias)
	g.GET("/books/match", h.GetBookMatches)

	// Media item routes (all authenticated users)
	g.GET("/media-items", h.ListMediaItems)
	g.GET("/media-items/filtered", h.ListMediaItemsFiltered)
	g.GET("/media-items/search", h.SearchMediaItems)
	g.GET("/media-items/:id", h.GetMediaItem)
	g.POST("/media-items/:id/rating", h.CreateMediaRating)
	g.GET("/media-items/:id/rating", h.GetMediaRating)
	g.PUT("/media-items/:id/rating", h.UpdateMediaRating)
	g.DELETE("/media-items/:id/rating", h.DeleteMediaRating)

	// Legacy progress routes (deprecated - use universal progress instead)
	g.GET("/media-items/:id/progress", h.GetMediaReadingProgress)
	g.PUT("/media-items/:id/progress", h.UpdateMediaReadingProgress)
	g.DELETE("/media-items/:id/progress", h.DeleteMediaReadingProgress)

	// Universal Progress routes (Phase 1)
	g.GET("/progress/:id", h.GetUniversalProgress)
	g.POST("/progress/:id", h.UpdateUniversalProgress)
	g.GET("/progress/:id/history", h.GetProgressHistory)

	// Notes routes
	g.GET("/media-items/:id/notes", h.GetMediaNotes)
	g.POST("/media-items/:id/notes", h.CreateMediaNote)
	g.GET("/media-items/:id/notes/:noteId", h.GetMediaNote)
	g.PUT("/media-items/:id/notes/:noteId", h.UpdateMediaNote)
	g.DELETE("/media-items/:id/notes/:noteId", h.DeleteMediaNote)

	// Highlights routes
	g.GET("/media-items/:id/highlights", h.GetMediaHighlights)
	g.POST("/media-items/:id/highlights", h.CreateMediaHighlight)
	g.GET("/media-items/:id/highlights/:highlightId", h.GetMediaHighlight)
	g.PUT("/media-items/:id/highlights/:highlightId", h.UpdateMediaHighlight)
	g.DELETE("/media-items/:id/highlights/:highlightId", h.DeleteMediaHighlight)

	// Admin-only routes
	admin := g.Group("", AdminMiddleware)
	admin.POST("/media-items", h.CreateMediaItem)
	admin.PUT("/media-items/:id", h.UpdateMediaItem)
	admin.DELETE("/media-items/:id", h.DeleteMediaItem)

	// Scanner routes (admin only)
	admin.POST("/scanner/scan", h.ScanEbooks)
	admin.POST("/scanner/start", h.StartScanner)
	admin.POST("/scanner/stop", h.StopScanner)
	admin.GET("/scanner/status/:jobId", h.GetScanStatus)

	// Watch mode routes (admin only)
	admin.POST("/scanner/watch/start", h.StartWatchMode)
	admin.POST("/scanner/watch/stop", h.StopWatchMode)
	admin.GET("/scanner/watch/status", h.GetWatchModeStatus)

	return h
}

// ScanEbooksRequest represents the request for scanning ebooks
type ScanEbooksRequest struct {
	FolderPaths []string `json:"folder_paths,omitempty"`
	LibraryID   string   `json:"library_id,omitempty"`
}

// ScanEbooks handles POST /api/scanner/scan (now runs in background)
func (h *Handler) ScanEbooks(c echo.Context) error {
	var req ScanEbooksRequest

	// Check if scan_request is set in context (from library scan route)
	if scanReq, ok := c.Get("scan_request").(map[string]interface{}); ok {
		if libraryID, ok := scanReq["library_id"].(string); ok {
			req.LibraryID = libraryID
		}
	}

	// Bind request body if provided (for direct scanner/scan calls)
	if err := c.Bind(&req); err != nil && req.LibraryID == "" {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
	}

	// Get user ID from JWT token
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user id"})
	}

	var folderPaths []string

	// If library_id is provided, fetch folders from library
	if req.LibraryID != "" {
		libraryUUID, err := uuid.Parse(req.LibraryID)
		if err != nil {
			return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid library id"})
		}

		// Fetch library folders from database
		libraryFolders, err := h.db.GetLibraryFolders(c.Request().Context(), pgtype.UUID{Bytes: [16]byte(libraryUUID), Valid: true})
		if err != nil {
			return c.JSON(http.StatusNotFound, map[string]string{"error": "library not found or has no folders"})
		}

		// Extract folder paths
		for _, folder := range libraryFolders {
			folderPaths = append(folderPaths, folder.FolderPath)
		}

		if len(folderPaths) == 0 {
			return c.JSON(http.StatusBadRequest, map[string]string{"error": "library has no folders configured"})
		}
	} else if len(req.FolderPaths) > 0 {
		// Use folder paths from request
		folderPaths = req.FolderPaths
	} else {
		// Neither library_id nor folder_paths provided
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "either library_id or folder_paths required for scanning"})
	}

	jobID := uuid.New().String()

	job := &services.Job{
		ID:   jobID,
		Type: services.JobTypeScan,
		Params: map[string]interface{}{
			"library_id": req.LibraryID,
			"folders":    folderPaths,
			"admin_id":   userUUID.String(),
			"db":         h.db,
		},
		Status:  services.JobStatusPending,
		Context: h.ctx,
	}

	if err := h.worker.EnqueueJob(job); err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": "failed to enqueue scan job: " + err.Error()})
	}

	return c.JSON(http.StatusAccepted, map[string]interface{}{
		"message": "scan job enqueued",
		"job_id":  jobID,
		"status":  "pending",
	})
}

// StartScanner handles POST /api/scanner/start
func (h *Handler) StartScanner(c echo.Context) error {
	h.mu.Lock()
	defer h.mu.Unlock()

	var req ScanEbooksRequest
	if err := c.Bind(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
	}

	// Get admin ID from JWT token
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user id"})
	}

	// Set the folder paths
	if err := h.scanner.SetFolders(req.FolderPaths); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid folder paths: " + err.Error()})
	}

	// Set the admin ID for ebook association
	h.scanner.SetAdminID(pgtype.UUID{Bytes: userUUID, Valid: true})

	// Start watching for changes
	h.scanner.WatchChanges(h.ctx)

	return c.JSON(http.StatusOK, map[string]string{"message": "scanner started"})
}

// StopScanner handles POST /api/scanner/stop
func (h *Handler) StopScanner(c echo.Context) error {
	h.mu.Lock()
	defer h.mu.Unlock()

	h.cancel()
	h.ctx, h.cancel = context.WithCancel(context.Background())

	return c.JSON(http.StatusOK, map[string]string{"message": "scanner stopped"})
}

// GetScanStatus handles GET /api/scanner/status/:jobId
func (h *Handler) GetScanStatus(c echo.Context) error {
	jobID := c.Param("jobId")

	result, exists := h.worker.GetJobStatus(jobID)
	if !exists {
		return c.JSON(http.StatusNotFound, map[string]string{"error": "job not found"})
	}

	return c.JSON(http.StatusOK, map[string]interface{}{
		"job_id":   result.JobID,
		"status":   result.Status,
		"error":    result.Error,
		"result":   result.Result,
		"progress": result.Progress,
	})
}

// StartWatchModeForLibrary starts watching a specific library's folders
func (h *Handler) StartWatchModeForLibrary(ctx context.Context, libraryID pgtype.UUID, adminID pgtype.UUID) error {
	h.mu.Lock()
	defer h.mu.Unlock()

	libraryIDStr := fmt.Sprintf("%x", libraryID.Bytes)
	if h.watchingLibraries[libraryIDStr] {
		return fmt.Errorf("already watching library %s", libraryIDStr)
	}

	folders, err := h.db.GetLibraryFolders(ctx, libraryID)
	if err != nil {
		return fmt.Errorf("failed to get library folders: %v", err)
	}

	if len(folders) == 0 {
		return fmt.Errorf("no folders configured for library")
	}

	folderPaths := make([]string, len(folders))
	for i, folder := range folders {
		folderPaths[i] = folder.FolderPath
	}

	scanner := services.NewEbookScanner(h.db)
	if err := scanner.SetFolders(folderPaths); err != nil {
		return fmt.Errorf("failed to set scanner folders: %v", err)
	}

	scanner.SetAdminID(adminID)
	scanner.WatchChanges(h.watchModeCtx)

	h.watchingLibraries[libraryIDStr] = true

	return nil
}

// StopWatchModeForLibrary stops watching a specific library
func (h *Handler) StopWatchModeForLibrary(libraryID pgtype.UUID) error {
	h.mu.Lock()
	defer h.mu.Unlock()

	libraryIDStr := fmt.Sprintf("%x", libraryID.Bytes)
	if !h.watchingLibraries[libraryIDStr] {
		return fmt.Errorf("not watching library %s", libraryIDStr)
	}

	delete(h.watchingLibraries, libraryIDStr)

	if len(h.watchingLibraries) == 0 {
		h.watchModeCancel()
		newCtx, newCancel := context.WithCancel(context.Background())
		h.watchModeCtx = newCtx
		h.watchModeCancel = newCancel
	}

	return nil
}

// StartWatchMode handles POST /api/scanner/watch/start
func (h *Handler) StartWatchMode(c echo.Context) error {
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user id"})
	}

	var req struct {
		LibraryID string `json:"library_id"`
	}
	if err := c.Bind(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
	}

	if req.LibraryID == "" {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "library_id required"})
	}

	libraryID, err := uuid.Parse(req.LibraryID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid library id"})
	}

	if err := h.StartWatchModeForLibrary(c.Request().Context(), pgtype.UUID{Bytes: [16]byte(libraryID), Valid: true}, pgtype.UUID{Bytes: [16]byte(userUUID), Valid: true}); err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, map[string]interface{}{
		"message":    "watch mode started for library",
		"library_id": req.LibraryID,
	})
}

// StopWatchMode handles POST /api/scanner/watch/stop
func (h *Handler) StopWatchMode(c echo.Context) error {
	var req struct {
		LibraryID string `json:"library_id"`
	}
	if err := c.Bind(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
	}

	if req.LibraryID == "" {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "library_id required"})
	}

	libraryID, err := uuid.Parse(req.LibraryID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid library id"})
	}

	if err := h.StopWatchModeForLibrary(pgtype.UUID{Bytes: [16]byte(libraryID), Valid: true}); err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, map[string]interface{}{
		"message":    "watch mode stopped for library",
		"library_id": req.LibraryID,
	})
}

// GetWatchModeStatus handles GET /api/scanner/watch/status
func (h *Handler) GetWatchModeStatus(c echo.Context) error {
	h.mu.Lock()
	defer h.mu.Unlock()

	watchingLibraries := make([]string, 0, len(h.watchingLibraries))
	for libID := range h.watchingLibraries {
		watchingLibraries = append(watchingLibraries, libID)
	}

	return c.JSON(http.StatusOK, map[string]interface{}{
		"watching_libraries": watchingLibraries,
		"total_watching":     len(watchingLibraries),
	})
}

// StartWatchModeForAllLibraries starts watching all configured libraries
func (h *Handler) StartWatchModeForAllLibraries(ctx context.Context) error {
	libraries, err := h.db.ListLibraries(ctx)
	if err != nil {
		return fmt.Errorf("failed to list libraries: %v", err)
	}

	for _, library := range libraries {
		libraryIDStr := fmt.Sprintf("%x", library.ID.Bytes)
		if err := h.StartWatchModeForLibrary(ctx, library.ID, library.ID); err != nil {
			fmt.Printf("Warning: failed to start watch mode for library %s: %v\n", libraryIDStr, err)
			continue
		}
		fmt.Printf("Started watch mode for library %s (%s)\n", library.Name, libraryIDStr)
	}

	return nil
}

// StartScheduler starts the auto-scan scheduler
func (h *Handler) StartScheduler() {
	h.scheduler.Start()
}

// StopScheduler stops the auto-scan scheduler
func (h *Handler) StopScheduler() {
	h.scheduler.Stop()
}

// Media Item handlers for new library system

// ListMediaItems handles GET /api/media-items
func (h *Handler) ListMediaItems(c echo.Context) error {
	libraryID := c.QueryParam("library_id")
	sort := c.QueryParam("sort")
	limit, _ := strconv.Atoi(c.QueryParam("limit"))
	offset, _ := strconv.Atoi(c.QueryParam("offset"))

	if limit == 0 {
		limit = 50
	}

	if sort == "" {
		sort = "created_at DESC"
	}

	allowedSorts := map[string]bool{
		"created_at ASC":      true,
		"created_at DESC":     true,
		"title ASC":           true,
		"title DESC":          true,
		"author ASC":          true,
		"author DESC":         true,
		"series ASC":          true,
		"series DESC":         true,
		"date_published ASC":  true,
		"date_published DESC": true,
		"copyright_year ASC":  true,
		"copyright_year DESC": true,
		"page_count ASC":      true,
		"page_count DESC":     true,
		"genre ASC":           true,
		"genre DESC":          true,
	}

	if !allowedSorts[sort] {
		sort = "created_at DESC"
	}

	// Enforce maximum limit
	if limit > maxPaginationLimit {
		limit = maxPaginationLimit
	}

	if offset < 0 {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "offset cannot be negative"})
	}

	if libraryID != "" {
		libUUID, err := uuid.Parse(libraryID)
		if err != nil {
			return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid library id"})
		}

		items, err := h.db.ListMediaItemsSorted(c.Request().Context(), database.ListMediaItemsSortedParams{
			LibraryID: pgtype.UUID{Bytes: libUUID, Valid: true},
			Sort:      pgtype.Text{String: sort, Valid: true},
			Limit:     pgtype.Int4{Int32: int32(limit), Valid: true},
			Offset:    pgtype.Int4{Int32: int32(offset), Valid: true},
		})
		if err != nil {
			return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
		}

		return c.JSON(http.StatusOK, map[string]interface{}{"data": items})
	}

	items, err := h.db.ListMediaItems(c.Request().Context(), database.ListMediaItemsParams{
		Limit:  int32(limit),
		Offset: int32(offset),
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, map[string]interface{}{"data": items})
}

// GetMediaItem handles GET /api/media-items/:id
func (h *Handler) GetMediaItem(c echo.Context) error {
	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	item, err := h.db.GetMediaItem(c.Request().Context(), pgtype.UUID{Bytes: mediaUUID, Valid: true})
	if err != nil {
		if err == pgx.ErrNoRows {
			return c.JSON(http.StatusNotFound, map[string]string{"error": "media item not found"})
		}
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, item)
}

// ListMediaItemsFiltered handles GET /api/media-items/filtered
func (h *Handler) ListMediaItemsFiltered(c echo.Context) error {
	userID := c.Get("user_id").(string)
	libraryID := c.QueryParam("library_id")
	sort := c.QueryParam("sort")
	limit, _ := strconv.Atoi(c.QueryParam("limit"))
	offset, _ := strconv.Atoi(c.QueryParam("offset"))

	authorFilter := c.QueryParam("author_filter")
	seriesFilter := c.QueryParam("series_filter")
	genreFilter := c.QueryParam("genre_filter")
	languageFilter := c.QueryParam("language_filter")
	yearMin, _ := strconv.Atoi(c.QueryParam("year_min"))
	yearMax, _ := strconv.Atoi(c.QueryParam("year_max"))
	hasCover, _ := strconv.ParseBool(c.QueryParam("has_cover"))

	if limit == 0 {
		limit = 50
	}

	if sort == "" {
		sort = "created_at DESC"
	}

	// Enforce maximum limit
	if limit > maxPaginationLimit {
		limit = maxPaginationLimit
	}

	libUUID, err := uuid.Parse(libraryID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid library id"})
	}

	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user id"})
	}

	items, err := h.db.ListMediaItemsFiltered(c.Request().Context(), database.ListMediaItemsFilteredParams{
		LibraryID:      pgtype.UUID{Bytes: libUUID, Valid: true},
		UserID:         pgtype.UUID{Bytes: userUUID, Valid: true},
		AuthorFilter:   pgtype.Text{String: authorFilter, Valid: true},
		SeriesFilter:   pgtype.Text{String: seriesFilter, Valid: true},
		GenreFilter:    pgtype.Text{String: genreFilter, Valid: true},
		LanguageFilter: pgtype.Text{String: languageFilter, Valid: true},
		YearMin:        pgtype.Int4{Int32: int32(yearMin), Valid: true},
		YearMax:        pgtype.Int4{Int32: int32(yearMax), Valid: true},
		HasCover:       pgtype.Bool{Bool: hasCover, Valid: true},
		Sort:           pgtype.Text{String: sort, Valid: true},
		Limit:          pgtype.Int4{Int32: int32(limit), Valid: true},
		Offset:         pgtype.Int4{Int32: int32(offset), Valid: true},
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, map[string]interface{}{"data": items})
}

// CreateMediaRating handles POST /api/media-items/:id/rating
func (h *Handler) CreateMediaRating(c echo.Context) error {
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user"})
	}

	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	var req struct {
		Rating int32 `json:"rating" validate:"required,min=1,max=10"`
	}
	if err := c.Bind(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
	}
	if err := c.Validate(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": err.Error()})
	}

	rating, err := h.db.CreateMediaRating(c.Request().Context(), database.CreateMediaRatingParams{
		MediaItemID: pgtype.UUID{Bytes: mediaUUID, Valid: true},
		UserID:      pgtype.UUID{Bytes: userUUID, Valid: true},
		Rating:      req.Rating,
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusCreated, rating)
}

// GetMediaRating handles GET /api/media-items/:id/rating
func (h *Handler) GetMediaRating(c echo.Context) error {
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user"})
	}

	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	rating, err := h.db.GetMediaRating(c.Request().Context(), database.GetMediaRatingParams{
		MediaItemID: pgtype.UUID{Bytes: mediaUUID, Valid: true},
		UserID:      pgtype.UUID{Bytes: userUUID, Valid: true},
	})
	if err != nil {
		if err == pgx.ErrNoRows {
			return c.JSON(http.StatusOK, map[string]interface{}{"rating": nil})
		}
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, rating)
}

// UpdateMediaRating handles PUT /api/media-items/:id/rating
func (h *Handler) UpdateMediaRating(c echo.Context) error {
	return h.CreateMediaRating(c) // Same logic as create due to upsert
}

// DeleteMediaRating handles DELETE /api/media-items/:id/rating
func (h *Handler) DeleteMediaRating(c echo.Context) error {
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user"})
	}

	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	err = h.db.DeleteMediaRating(c.Request().Context(), database.DeleteMediaRatingParams{
		MediaItemID: pgtype.UUID{Bytes: mediaUUID, Valid: true},
		UserID:      pgtype.UUID{Bytes: userUUID, Valid: true},
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, map[string]string{"message": "rating deleted"})
}

// GetMediaReadingProgress handles GET /api/media-items/:id/progress
func (h *Handler) GetMediaReadingProgress(c echo.Context) error {
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user"})
	}

	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	progress, err := h.db.GetReadingProgress(c.Request().Context(), database.GetReadingProgressParams{
		MediaItemID: pgtype.UUID{Bytes: mediaUUID, Valid: true},
		UserID:      pgtype.UUID{Bytes: userUUID, Valid: true},
	})
	if err != nil {
		if err == pgx.ErrNoRows {
			return c.JSON(http.StatusOK, map[string]interface{}{
				"current_page": 0,
				"total_pages":  nil,
			})
		}
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, progress)
}

// UpdateMediaReadingProgress handles PUT /api/media-items/:id/progress
func (h *Handler) UpdateMediaReadingProgress(c echo.Context) error {
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user"})
	}

	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	var req struct {
		CurrentPage int32 `json:"current_page"`
		TotalPages  int32 `json:"total_pages"`
	}
	if err := c.Bind(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
	}
	if err := c.Validate(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": err.Error()})
	}

	progress, err := h.db.UpdateReadingProgress(c.Request().Context(), database.UpdateReadingProgressParams{
		MediaItemID: pgtype.UUID{Bytes: mediaUUID, Valid: true},
		UserID:      pgtype.UUID{Bytes: userUUID, Valid: true},
		CurrentPage: pgtype.Int4{Int32: req.CurrentPage, Valid: true},
		TotalPages:  pgtype.Int4{Int32: req.TotalPages, Valid: req.TotalPages > 0},
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, progress)
}

// DeleteMediaReadingProgress handles DELETE /api/media-items/:id/progress
func (h *Handler) DeleteMediaReadingProgress(c echo.Context) error {
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user"})
	}

	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	err = h.db.DeleteReadingProgress(c.Request().Context(), database.DeleteReadingProgressParams{
		MediaItemID: pgtype.UUID{Bytes: mediaUUID, Valid: true},
		UserID:      pgtype.UUID{Bytes: userUUID, Valid: true},
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, map[string]string{"message": "reading progress deleted"})
}

// Admin Media Items handlers

// CreateMediaItemRequest represents the request for creating a media item
type CreateMediaItemRequest struct {
	LibraryID      uuid.UUID `json:"library_id" validate:"required"`
	Title          string    `json:"title" validate:"required,min=1,max=500"`
	Author         string    `json:"author"`
	ISBN           string    `json:"isbn"`
	Description    string    `json:"description"`
	FilePath       string    `json:"file_path" validate:"required"`
	FileSize       int64     `json:"file_size" validate:"required,min=1"`
	MimeType       string    `json:"mime_type" validate:"required"`
	CoverImagePath string    `json:"cover_image_path"`
	Series         string    `json:"series"`
	SeriesNumber   int32     `json:"series_number"`
	Tags           string    `json:"tags"`
	ASIN           string    `json:"asin"`
	DatePublished  string    `json:"date_published"`
	Publisher      string    `json:"publisher"`
	Contributors   string    `json:"contributors"`
}

// CreateMediaItem handles POST /api/media-items (admin only)
func (h *Handler) CreateMediaItem(c echo.Context) error {
	user := MustGetAuthenticatedUser(c)

	// Verify user is admin
	if user.Role != "admin" {
		return c.JSON(http.StatusForbidden, map[string]string{"error": "admin access required"})
	}

	var req CreateMediaItemRequest
	if err := c.Bind(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
	}
	if err := c.Validate(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": err.Error()})
	}

	// Validate library exists
	_, err := h.db.GetLibrary(c.Request().Context(), pgtype.UUID{Bytes: req.LibraryID, Valid: true})
	if err != nil {
		if err == pgx.ErrNoRows {
			return c.JSON(http.StatusBadRequest, map[string]string{"error": "library not found"})
		}
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	mediaItemID, err := h.db.CreateMediaItem(c.Request().Context(), database.CreateMediaItemParams{
		LibraryID:      pgtype.UUID{Bytes: req.LibraryID, Valid: true},
		Title:          req.Title,
		Author:         pgtype.Text{String: req.Author, Valid: req.Author != ""},
		Isbn:           pgtype.Text{String: req.ISBN, Valid: req.ISBN != ""},
		Description:    pgtype.Text{String: req.Description, Valid: req.Description != ""},
		FilePath:       req.FilePath,
		FileSize:       pgtype.Int8{Int64: req.FileSize, Valid: req.FileSize > 0},
		MimeType:       pgtype.Text{String: req.MimeType, Valid: req.MimeType != ""},
		CoverImagePath: pgtype.Text{String: req.CoverImagePath, Valid: req.CoverImagePath != ""},
		Series:         pgtype.Text{String: req.Series, Valid: req.Series != ""},
		SeriesNumber:   pgtype.Int4{Int32: req.SeriesNumber, Valid: req.SeriesNumber > 0},
		Tags:           pgtype.Text{String: req.Tags, Valid: req.Tags != ""},
		Asin:           pgtype.Text{String: req.ASIN, Valid: req.ASIN != ""},
		DatePublished:  pgtype.Date{Time: parseDate(req.DatePublished), Valid: req.DatePublished != ""},
		Publisher:      pgtype.Text{String: req.Publisher, Valid: req.Publisher != ""},
		Contributors:   pgtype.Text{String: req.Contributors, Valid: req.Contributors != ""},
		AddedByAdminID: user.ID,
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	// Return the created item info
	item, err := h.db.GetMediaItem(c.Request().Context(), pgtype.UUID{Bytes: mediaItemID.ID.Bytes, Valid: true})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusCreated, item)
}

// UpdateMediaItemRequest represents the request for updating a media item
type UpdateMediaItemRequest struct {
	Title          string `json:"title" validate:"required,min=1,max=500"`
	Author         string `json:"author"`
	ISBN           string `json:"isbn"`
	Description    string `json:"description"`
	CoverImagePath string `json:"cover_image_path"`
	Series         string `json:"series"`
	SeriesNumber   int32  `json:"series_number"`
	Tags           string `json:"tags"`
	ASIN           string `json:"asin"`
	DatePublished  string `json:"date_published"`
	Publisher      string `json:"publisher"`
	Contributors   string `json:"contributors"`
}

// UpdateMediaItem handles PUT /api/media-items/:id (admin only)
func (h *Handler) UpdateMediaItem(c echo.Context) error {
	user := MustGetAuthenticatedUser(c)

	// Verify user is admin
	if user.Role != "admin" {
		return c.JSON(http.StatusForbidden, map[string]string{"error": "admin access required"})
	}

	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	var req UpdateMediaItemRequest
	if err := c.Bind(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
	}
	if err := c.Validate(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": err.Error()})
	}

	item, err := h.db.UpdateMediaItem(c.Request().Context(), database.UpdateMediaItemParams{
		ID:             pgtype.UUID{Bytes: mediaUUID, Valid: true},
		Title:          req.Title,
		Author:         pgtype.Text{String: req.Author, Valid: req.Author != ""},
		Isbn:           pgtype.Text{String: req.ISBN, Valid: req.ISBN != ""},
		Description:    pgtype.Text{String: req.Description, Valid: req.Description != ""},
		CoverImagePath: pgtype.Text{String: req.CoverImagePath, Valid: req.CoverImagePath != ""},
		Series:         pgtype.Text{String: req.Series, Valid: req.Series != ""},
		SeriesNumber:   pgtype.Int4{Int32: req.SeriesNumber, Valid: req.SeriesNumber > 0},
		Tags:           pgtype.Text{String: req.Tags, Valid: req.Tags != ""},
		Asin:           pgtype.Text{String: req.ASIN, Valid: req.ASIN != ""},
		DatePublished:  pgtype.Date{Time: parseDate(req.DatePublished), Valid: req.DatePublished != ""},
		Publisher:      pgtype.Text{String: req.Publisher, Valid: req.Publisher != ""},
		Contributors:   pgtype.Text{String: req.Contributors, Valid: req.Contributors != ""},
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, item)
}

// DeleteMediaItem handles DELETE /api/media-items/:id (admin only)
func (h *Handler) DeleteMediaItem(c echo.Context) error {
	user := MustGetAuthenticatedUser(c)

	// Verify user is admin
	if user.Role != "admin" {
		return c.JSON(http.StatusForbidden, map[string]string{"error": "admin access required"})
	}

	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	err = h.db.DeleteMediaItem(c.Request().Context(), pgtype.UUID{Bytes: mediaUUID, Valid: true})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.NoContent(http.StatusNoContent)
}

// Media Notes handlers

// GetMediaNotes handles GET /api/media-items/:id/notes
func (h *Handler) GetMediaNotes(c echo.Context) error {
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user"})
	}

	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	notes, err := h.db.GetMediaNotes(c.Request().Context(), database.GetMediaNotesParams{
		MediaItemID: pgtype.UUID{Bytes: mediaUUID, Valid: true},
		UserID:      pgtype.UUID{Bytes: userUUID, Valid: true},
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, notes)
}

// CreateMediaNoteRequest represents the request for creating a media note
type CreateMediaNoteRequest struct {
	Content  string `json:"content" validate:"required,min=1,max=10000"`
	Position string `json:"position"`
}

// CreateMediaNote handles POST /api/media-items/:id/notes
func (h *Handler) CreateMediaNote(c echo.Context) error {
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user"})
	}

	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	var req CreateMediaNoteRequest
	if err := c.Bind(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
	}
	if err := c.Validate(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": err.Error()})
	}

	note, err := h.db.CreateMediaNote(c.Request().Context(), database.CreateMediaNoteParams{
		MediaItemID: pgtype.UUID{Bytes: mediaUUID, Valid: true},
		UserID:      pgtype.UUID{Bytes: userUUID, Valid: true},
		Content:     req.Content,
		Position:    pgtype.Text{String: req.Position, Valid: req.Position != ""},
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusCreated, note)
}

// GetMediaNote handles GET /api/media-items/:id/notes/:noteId
func (h *Handler) GetMediaNote(c echo.Context) error {
	noteID := c.Param("noteId")
	noteUUID, err := uuid.Parse(noteID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid note id"})
	}

	note, err := h.db.GetMediaNote(c.Request().Context(), pgtype.UUID{Bytes: noteUUID, Valid: true})
	if err != nil {
		if err == pgx.ErrNoRows {
			return c.JSON(http.StatusNotFound, map[string]string{"error": "note not found"})
		}
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, note)
}

// UpdateMediaNoteRequest represents the request for updating a media note
type UpdateMediaNoteRequest struct {
	Content  string `json:"content" validate:"required,min=1,max=10000"`
	Position string `json:"position"`
}

// UpdateMediaNote handles PUT /api/media-items/:id/notes/:noteId
func (h *Handler) UpdateMediaNote(c echo.Context) error {
	noteID := c.Param("noteId")
	noteUUID, err := uuid.Parse(noteID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid note id"})
	}

	var req UpdateMediaNoteRequest
	if err := c.Bind(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
	}
	if err := c.Validate(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": err.Error()})
	}

	note, err := h.db.UpdateMediaNote(c.Request().Context(), database.UpdateMediaNoteParams{
		ID:       pgtype.UUID{Bytes: noteUUID, Valid: true},
		Content:  req.Content,
		Position: pgtype.Text{String: req.Position, Valid: req.Position != ""},
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, note)
}

// DeleteMediaNote handles DELETE /api/media-items/:id/notes/:noteId
func (h *Handler) DeleteMediaNote(c echo.Context) error {
	noteID := c.Param("noteId")
	noteUUID, err := uuid.Parse(noteID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid note id"})
	}

	err = h.db.DeleteMediaNote(c.Request().Context(), pgtype.UUID{Bytes: noteUUID, Valid: true})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.NoContent(http.StatusNoContent)
}

// Media Highlights handlers

// GetMediaHighlights handles GET /api/media-items/:id/highlights
func (h *Handler) GetMediaHighlights(c echo.Context) error {
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user"})
	}

	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	highlights, err := h.db.GetMediaHighlights(c.Request().Context(), database.GetMediaHighlightsParams{
		MediaItemID: pgtype.UUID{Bytes: mediaUUID, Valid: true},
		UserID:      pgtype.UUID{Bytes: userUUID, Valid: true},
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, highlights)
}

// CreateMediaHighlightRequest represents the request for creating a media highlight
type CreateMediaHighlightRequest struct {
	SelectionText string `json:"selection_text" validate:"required,min=1,max=5000"`
	StartPosition string `json:"start_position" validate:"required,max=100"`
	EndPosition   string `json:"end_position" validate:"required,max=100"`
	Color         string `json:"color" validate:"omitempty,len=7"` // hex color
	NoteID        string `json:"note_id"`
}

// CreateMediaHighlight handles POST /api/media-items/:id/highlights
func (h *Handler) CreateMediaHighlight(c echo.Context) error {
	userID := c.Get("user_id").(string)
	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user"})
	}

	mediaID := c.Param("id")
	mediaUUID, err := uuid.Parse(mediaID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
	}

	var req CreateMediaHighlightRequest
	if err := c.Bind(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
	}
	if err := c.Validate(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": err.Error()})
	}

	var noteUUID pgtype.UUID
	if req.NoteID != "" {
		if noteID, err := uuid.Parse(req.NoteID); err != nil {
			return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid note id"})
		} else {
			noteUUID = pgtype.UUID{Bytes: noteID, Valid: true}
		}
	}

	color := "#ffff00" // default yellow
	if req.Color != "" {
		color = req.Color
	}

	highlight, err := h.db.CreateMediaHighlight(c.Request().Context(), database.CreateMediaHighlightParams{
		MediaItemID:   pgtype.UUID{Bytes: mediaUUID, Valid: true},
		UserID:        pgtype.UUID{Bytes: userUUID, Valid: true},
		SelectionText: req.SelectionText,
		StartPosition: pgtype.Text{String: req.StartPosition, Valid: true},
		EndPosition:   pgtype.Text{String: req.EndPosition, Valid: true},
		Color:         pgtype.Text{String: color, Valid: true},
		NoteID:        noteUUID,
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusCreated, highlight)
}

// GetMediaHighlight handles GET /api/media-items/:id/highlights/:highlightId
func (h *Handler) GetMediaHighlight(c echo.Context) error {
	highlightID := c.Param("highlightId")
	highlightUUID, err := uuid.Parse(highlightID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid highlight id"})
	}

	highlight, err := h.db.GetMediaHighlight(c.Request().Context(), pgtype.UUID{Bytes: highlightUUID, Valid: true})
	if err != nil {
		if err == pgx.ErrNoRows {
			return c.JSON(http.StatusNotFound, map[string]string{"error": "highlight not found"})
		}
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, highlight)
}

// UpdateMediaHighlightRequest represents the request for updating a media highlight
type UpdateMediaHighlightRequest struct {
	SelectionText string `json:"selection_text" validate:"required,min=1,max=5000"`
	StartPosition string `json:"start_position" validate:"required,max=100"`
	EndPosition   string `json:"end_position" validate:"required,max=100"`
	Color         string `json:"color" validate:"omitempty,len=7"` // hex color
	NoteID        string `json:"note_id"`
}

// UpdateMediaHighlight handles PUT /api/media-items/:id/highlights/:highlightId
func (h *Handler) UpdateMediaHighlight(c echo.Context) error {
	highlightID := c.Param("highlightId")
	highlightUUID, err := uuid.Parse(highlightID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid highlight id"})
	}

	var req UpdateMediaHighlightRequest
	if err := c.Bind(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
	}
	if err := c.Validate(&req); err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": err.Error()})
	}

	var noteUUID pgtype.UUID
	if req.NoteID != "" {
		if noteID, err := uuid.Parse(req.NoteID); err != nil {
			return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid note id"})
		} else {
			noteUUID = pgtype.UUID{Bytes: noteID, Valid: true}
		}
	}

	color := "#ffff00" // default yellow
	if req.Color != "" {
		color = req.Color
	}

	highlight, err := h.db.UpdateMediaHighlight(c.Request().Context(), database.UpdateMediaHighlightParams{
		ID:            pgtype.UUID{Bytes: highlightUUID, Valid: true},
		SelectionText: req.SelectionText,
		StartPosition: pgtype.Text{String: req.StartPosition, Valid: true},
		EndPosition:   pgtype.Text{String: req.EndPosition, Valid: true},
		Color:         pgtype.Text{String: color, Valid: true},
		NoteID:        noteUUID,
	})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.JSON(http.StatusOK, highlight)
}

// DeleteMediaHighlight handles DELETE /api/media-items/:id/highlights/:highlightId
func (h *Handler) DeleteMediaHighlight(c echo.Context) error {
	highlightID := c.Param("highlightId")
	highlightUUID, err := uuid.Parse(highlightID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid highlight id"})
	}

	err = h.db.DeleteMediaHighlight(c.Request().Context(), pgtype.UUID{Bytes: highlightUUID, Valid: true})
	if err != nil {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	return c.NoContent(http.StatusNoContent)
}

// SearchMediaItems handles GET /api/media-items/search
// Performs partial matching search with fuzzy fallback if no results found
func (h *Handler) SearchMediaItems(c echo.Context) error {
	query := c.QueryParam("q")
	userID := c.Get("user_id").(string)

	if query == "" {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "query parameter 'q' is required"})
	}

	userUUID, err := uuid.Parse(userID)
	if err != nil {
		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user id"})
	}

	limit := int32(50)
	offset := int32(0)

	searchPattern := "%" + query + "%"

	partialResults, err := h.db.SearchMediaItems(c.Request().Context(), database.SearchMediaItemsParams{
		SearchPattern: pgtype.Text{String: searchPattern, Valid: true},
		UserID:        pgtype.UUID{Bytes: userUUID, Valid: true},
		Limit:         pgtype.Int4{Int32: limit, Valid: true},
		Offset:        pgtype.Int4{Int32: offset, Valid: true},
	})

	if err != nil && err != pgx.ErrNoRows {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	if len(partialResults) > 0 {
		return c.JSON(http.StatusOK, partialResults)
	}

	fuzzyResults, err := h.db.SearchMediaItemsFuzzy(c.Request().Context(), database.SearchMediaItemsFuzzyParams{
		SearchQuery: pgtype.Text{String: query, Valid: true},
		UserID:      pgtype.UUID{Bytes: userUUID, Valid: true},
		Limit:       pgtype.Int4{Int32: limit, Valid: true},
		Offset:      pgtype.Int4{Int32: offset, Valid: true},
	})

	if err != nil && err != pgx.ErrNoRows {
		return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
	}

	if len(fuzzyResults) == 0 {
		return c.JSON(http.StatusNotFound, map[string]interface{}{
			"error":   "no results found",
			"query":   query,
			"results": []interface{}{},
		})
	}

	return c.JSON(http.StatusOK, fuzzyResults)
}