// Thin TypeScript wrapper for Rust repository implementation
// All API calls go through Tauri commands in src-tauri/src/commands/repository.rs
// NO direct HTTP calls - everything routes through Rust backend

import { invoke } from "@tauri-apps/api/core";
import type { QualityPreset } from "./quality-presets";
import { QUALITY_PRESETS } from "./quality-presets";
import { validateItemId, validateImageType, validateMediaSourceId, validateNumericParam, validateQueryParamValue } from "$lib/utils/validation";
import type {
  Library,
  MediaItem,
  SearchResult,
  GetItemsOptions,
  SearchOptions,
  PlaybackInfo,
  ImageType,
  ImageOptions,
  Genre,
} from "./types";

/**
 * Repository client - thin wrapper over Rust HybridRepository
 * Uses handle-based system: create() returns a UUID handle for all operations
 */
export class RepositoryClient {
  private handle: string | null = null;
  private _serverUrl: string | null = null;
  private _accessToken: string | null = null;

  /**
   * Create a new repository instance in Rust
   * Returns the repository handle for subsequent operations
   */
  async create(
    serverUrl: string,
    userId: string,
    accessToken: string,
    serverId: string
  ): Promise<string> {
    console.log("[RepositoryClient] Creating Rust repository...");
    this.handle = await invoke<string>("repository_create", {
      serverUrl,
      userId,
      accessToken,
      serverId,
    });

    // Store for URL construction
    this._serverUrl = serverUrl;
    this._accessToken = accessToken;

    console.log("[RepositoryClient] Repository created with handle:", this.handle);
    return this.handle;
  }

  /**
   * Destroy the repository instance in Rust
   * Call this on logout or when switching servers
   */
  async destroy(): Promise<void> {
    if (this.handle) {
      await invoke("repository_destroy", { handle: this.handle });
      this.handle = null;
      this._serverUrl = null;
      this._accessToken = null;
    }
  }

  private ensureHandle(): string {
    if (!this.handle) {
      throw new Error("Repository not initialized - call create() first");
    }
    return this.handle;
  }

  /**
   * Get the repository handle for passing to backend commands
   */
  getHandle(): string {
    return this.ensureHandle();
  }

  // ===== Library Methods (all via Rust) =====

  async getLibraries(): Promise<Library[]> {
    return invoke<Library[]>("repository_get_libraries", {
      handle: this.ensureHandle(),
    });
  }

  async getItems(parentId: string, options?: GetItemsOptions): Promise<SearchResult> {
    return invoke<SearchResult>("repository_get_items", {
      handle: this.ensureHandle(),
      parentId,
      options: options ?? null,
    });
  }

  async getItem(itemId: string): Promise<MediaItem> {
    return invoke<MediaItem>("repository_get_item", {
      handle: this.ensureHandle(),
      itemId,
    });
  }

  async getLatestItems(parentId: string, limit?: number): Promise<MediaItem[]> {
    return invoke<MediaItem[]>("repository_get_latest_items", {
      handle: this.ensureHandle(),
      parentId,
      limit: limit ?? null,
    });
  }

  async getResumeItems(parentId?: string, limit?: number): Promise<MediaItem[]> {
    return invoke<MediaItem[]>("repository_get_resume_items", {
      handle: this.ensureHandle(),
      parentId: parentId ?? null,
      limit: limit ?? null,
    });
  }

  async getNextUpEpisodes(seriesId?: string, limit?: number): Promise<MediaItem[]> {
    return invoke<MediaItem[]>("repository_get_next_up_episodes", {
      handle: this.ensureHandle(),
      seriesId: seriesId ?? null,
      limit: limit ?? null,
    });
  }

  async getRecentlyPlayedAudio(limit?: number): Promise<MediaItem[]> {
    return invoke<MediaItem[]>("repository_get_recently_played_audio", {
      handle: this.ensureHandle(),
      limit: limit ?? null,
    });
  }

  async getResumeMovies(limit?: number): Promise<MediaItem[]> {
    return invoke<MediaItem[]>("repository_get_resume_movies", {
      handle: this.ensureHandle(),
      limit: limit ?? null,
    });
  }

  async getGenres(parentId?: string): Promise<Genre[]> {
    return invoke<Genre[]>("repository_get_genres", {
      handle: this.ensureHandle(),
      parentId: parentId ?? null,
    });
  }

  async search(query: string, options?: SearchOptions): Promise<SearchResult> {
    return invoke<SearchResult>("repository_search", {
      handle: this.ensureHandle(),
      query,
      options: options ?? null,
    });
  }

  // ===== Playback Methods (all via Rust) =====

  async getPlaybackInfo(itemId: string): Promise<PlaybackInfo> {
    return invoke<PlaybackInfo>("repository_get_playback_info", {
      handle: this.ensureHandle(),
      itemId,
    });
  }

  async reportPlaybackStart(itemId: string, positionTicks: number): Promise<void> {
    return invoke("repository_report_playback_start", {
      handle: this.ensureHandle(),
      itemId,
      positionTicks,
    });
  }

  async reportPlaybackProgress(itemId: string, positionTicks: number): Promise<void> {
    return invoke("repository_report_playback_progress", {
      handle: this.ensureHandle(),
      itemId,
      positionTicks,
    });
  }

  async reportPlaybackStopped(itemId: string, positionTicks: number): Promise<void> {
    return invoke("repository_report_playback_stopped", {
      handle: this.ensureHandle(),
      itemId,
      positionTicks,
    });
  }

  // ===== Stream URL Methods (via Rust) =====

  async getAudioStreamUrl(itemId: string): Promise<string> {
    return invoke<string>("repository_get_audio_stream_url", {
      handle: this.ensureHandle(),
      itemId,
    });
  }

  async getVideoStreamUrl(
    itemId: string,
    mediaSourceId?: string,
    startTimeSeconds?: number,
    audioStreamIndex?: number
  ): Promise<string> {
    return invoke<string>("repository_get_video_stream_url", {
      handle: this.ensureHandle(),
      itemId,
      mediaSourceId: mediaSourceId ?? null,
      startTimeSeconds: startTimeSeconds ?? null,
      audioStreamIndex: audioStreamIndex ?? null,
    });
  }

  // ===== URL Construction Methods (sync, no server call) =====

  /**
   * Get image URL from backend
   * The Rust backend constructs and returns the URL with proper credentials handling
   */
  async getImageUrl(itemId: string, imageType: ImageType = "Primary", options?: ImageOptions): Promise<string> {
    return invoke<string>("repository_get_image_url", {
      handle: this.ensureHandle(),
      itemId,
      imageType,
      options: options ?? null,
    });
  }

  /**
   * Get subtitle URL - constructs URL synchronously (no server call)
   */
  getSubtitleUrl(itemId: string, mediaSourceId: string, streamIndex: number, format: string = "vtt"): string {
    if (!this._serverUrl || !this._accessToken) {
      throw new Error("Repository not initialized - call create() first");
    }

    // Validate inputs to prevent injection attacks
    validateItemId(itemId);
    validateMediaSourceId(mediaSourceId);
    const index = validateNumericParam(streamIndex, 0, 1000, "streamIndex");

    // Validate format - only allow safe subtitle formats
    if (!/^[a-z]+$/.test(format)) {
      throw new Error("Invalid subtitle format");
    }

    return `${this._serverUrl}/Videos/${itemId}/${mediaSourceId}/Subtitles/${index}/Stream.${format}?api_key=${this._accessToken}`;
  }

  /**
   * Get video download URL with quality preset - constructs URL synchronously
   * Used for offline downloads
   */
  getVideoDownloadUrl(
    itemId: string,
    quality: QualityPreset = "original",
    mediaSourceId?: string
  ): string {
    if (!this._serverUrl || !this._accessToken) {
      throw new Error("Repository not initialized - call create() first");
    }

    // Validate itemId and mediaSourceId
    validateItemId(itemId);
    if (mediaSourceId) {
      validateMediaSourceId(mediaSourceId);
    }

    const preset = QUALITY_PRESETS[quality];

    if (quality === "original" || !preset.videoBitrate) {
      // Direct stream for original quality
      const params = new URLSearchParams({
        api_key: this._accessToken,
        Static: "true",
        audioStreamIndex: "0",
      });
      if (mediaSourceId) {
        params.append("MediaSourceId", mediaSourceId);
      }
      return `${this._serverUrl}/Videos/${itemId}/stream?${params.toString()}`;
    }

    // Transcoded download with quality preset
    const params = new URLSearchParams({
      api_key: this._accessToken,
      DeviceId: localStorage.getItem("jellytau_device_id") || "jellytau",
      Container: "mp4",
      VideoCodec: "h264",
      AudioCodec: "aac",
      AudioStreamIndex: "0",
      VideoBitrate: preset.videoBitrate.toString(),
      AudioBitrate: preset.audioBitrate.toString(),
      MaxHeight: preset.maxHeight?.toString() ?? "",
      TranscodingMaxAudioChannels: "2",
    });

    if (mediaSourceId) {
      params.append("MediaSourceId", mediaSourceId);
    }

    return `${this._serverUrl}/Videos/${itemId}/stream.mp4?${params.toString()}`;
  }

  // ===== Favorite Methods (via Rust) =====

  async markFavorite(itemId: string): Promise<void> {
    return invoke("repository_mark_favorite", {
      handle: this.ensureHandle(),
      itemId,
    });
  }

  async unmarkFavorite(itemId: string): Promise<void> {
    return invoke("repository_unmark_favorite", {
      handle: this.ensureHandle(),
      itemId,
    });
  }

  // ===== Person Methods (via Rust) =====

  async getPerson(personId: string): Promise<MediaItem> {
    return invoke<MediaItem>("repository_get_person", {
      handle: this.ensureHandle(),
      personId,
    });
  }

  async getItemsByPerson(personId: string, options?: GetItemsOptions): Promise<SearchResult> {
    return invoke<SearchResult>("repository_get_items_by_person", {
      handle: this.ensureHandle(),
      personId,
      options: options ?? null,
    });
  }

  async getSimilarItems(itemId: string, limit?: number): Promise<SearchResult> {
    return invoke<SearchResult>("repository_get_similar_items", {
      handle: this.ensureHandle(),
      itemId,
      limit: limit ?? null,
    });
  }

  // ===== Getters =====

  get serverUrl(): string {
    if (!this._serverUrl) {
      throw new Error("Repository not initialized - call create() first");
    }
    return this._serverUrl;
  }
}