import { statSync, existsSync, writeFileSync } from 'fs';
import path from 'path';
import type { VideoInfo } from './video';
import { LogWrapper } from '@/napcat-core/helper/log';
import { FFmpegAdapterFactory } from './ffmpeg-adapter-factory';
import type { IFFmpegAdapter } from './ffmpeg-adapter-interface';
import { FFmpegExecAdapter } from './ffmpeg-exec-adapter';
import { FFmpegAddonAdapter } from './ffmpeg-addon-adapter';

export const getFFmpegPath = (tool: 'ffmpeg' | 'ffprobe', binaryPath?: string): string => {
  const configuredPath = process.env[tool === 'ffmpeg' ? 'FFMPEG_PATH' : 'FFPROBE_PATH'];
  if (configuredPath) return configuredPath;
  const executable = tool + (process.platform === 'win32' ? '.exe' : '');
  if (binaryPath) {
    const localPath = path.join(binaryPath, 'ffmpeg', executable);
    if (existsSync(localPath)) return localPath;
  }
  if (process.platform === 'darwin') {
    const directories = (process.env['PATH'] ?? '').split(':').filter(Boolean);
    directories.push(process.arch === 'arm64' ? '/opt/homebrew/bin' : '/usr/local/bin');
    for (const directory of directories) {
      const candidate = path.join(directory, executable);
      if (existsSync(candidate)) return candidate;
    }
  }
  return executable;
};

export let FFMPEG_CMD = 'ffmpeg';
export let FFPROBE_CMD = 'ffprobe';
export class FFmpegService {
  private static adapter: IFFmpegAdapter | null = null;
  private static initialized = false;
  private static initializationError: unknown;

  /**
     * 初始化 FFmpeg 服务
     * @param binaryPath 二进制文件路径(来自 pathWrapper.binaryPath)
     * @param logger 日志记录器
     */
  public static async init (binaryPath: string, logger: LogWrapper): Promise<void> {
    if (this.initialized) {
      return;
    }

    // 检查本地 ffmpeg 路径
    FFMPEG_CMD = getFFmpegPath('ffmpeg', binaryPath);
    FFPROBE_CMD = getFFmpegPath('ffprobe', binaryPath);

    try {
      this.adapter = await FFmpegAdapterFactory.getAdapter(
        logger,
        FFMPEG_CMD,
        FFPROBE_CMD,
        binaryPath
      );
    } catch (error) {
      this.initializationError = error;
      logger.logError('[FFmpeg] 媒体功能初始化失败:', error);
    }

    this.initialized = true;
  }

  public static getAdapterName (): string {
    if (!this.adapter) {
      throw this.initializationError ?? new Error('FFmpeg service not initialized. Please call FFmpegService.init() first.');
    }
    return this.adapter.name;
  }

  /**
     * 获取 FFmpeg 适配器
     */
  private static async getAdapter (): Promise<IFFmpegAdapter> {
    if (!this.adapter) {
      throw this.initializationError ?? new Error('FFmpeg service not initialized. Please call FFmpegService.init() first.');
    }
    return this.adapter;
  }

  public static async convertToNTSilkTct (inputFile: string, outputFile: string): Promise<void> {
    const adapter = await this.getAdapter();
    await adapter.convertToNTSilkTct(inputFile, outputFile);
  }

  /**
     * 设置 FFmpeg 路径并更新适配器
     * @deprecated 建议使用 init() 方法初始化
     */
  public static async setFfmpegPath (ffmpegPath: string, logger: LogWrapper): Promise<void> {
    const suffix = process.platform === 'win32' ? '.exe' : '';
    const ffmpegCommand = path.join(ffmpegPath, 'ffmpeg' + suffix);
    const ffprobeCommand = path.join(ffmpegPath, 'ffprobe' + suffix);
    this.adapter = await FFmpegAdapterFactory.updateFFmpegPath(logger, ffmpegCommand, ffprobeCommand);
    FFMPEG_CMD = ffmpegCommand;
    FFPROBE_CMD = ffprobeCommand;
    this.initializationError = undefined;
    this.initialized = true;
  }

  /**
     * 提取视频缩略图
     */
  public static async extractThumbnail (videoPath: string, thumbnailPath: string): Promise<void> {
    const adapter = await this.getAdapter();
    await adapter.extractThumbnail(videoPath, thumbnailPath);
  }

  /**
   * 直接发送到 QQ kernel 的旧视频元素使用 PNG 缩略图。
   * Packet/forward 路径继续使用当前适配器生成的 JPEG。
   */
  public static async extractLegacyVideoThumbnail (videoPath: string, thumbnailPath: string): Promise<void> {
    const currentAdapter = await this.getAdapter();
    if (currentAdapter instanceof FFmpegAddonAdapter) {
      await currentAdapter.extractThumbnail(videoPath, thumbnailPath, 'png');
      return;
    }
    const adapter = new FFmpegExecAdapter(FFMPEG_CMD, FFPROBE_CMD);
    await adapter.extractThumbnail(videoPath, thumbnailPath);
  }

  /**
     * 转换音频文件
     */
  public static async convertAudioFmt (inputFile: string, outputFile: string, format: string): Promise<void> {
    const adapter = await this.getAdapter();
    await adapter.convertFile(inputFile, outputFile, format);
  }

  /**
   * 获取音频时长
   */
  public static async getDuration (filePath: string): Promise<number> {
    const adapter = await this.getAdapter();
    return adapter.getDuration(filePath);
  }

  /**
   * 判断是否为 Silk 格式
   */
  public static async isSilk (filePath: string): Promise<boolean> {
    const adapter = await this.getAdapter();
    return adapter.isSilk(filePath);
  }

  /**
     * 转换为 PCM 格式
     */
  public static async convert (filePath: string, pcmPath: string): Promise<{ result: boolean, sampleRate: number; }> {
    const adapter = await this.getAdapter();
    return adapter.convertToPCM(filePath, pcmPath);
  }

  /**
     * 获取视频信息
     */
  public static async getVideoInfo (videoPath: string, thumbnailPath: string): Promise<VideoInfo> {
    const adapter = await this.getAdapter();

    const fileSize = statSync(videoPath).size;
    const videoInfo = await adapter.getVideoInfo(videoPath);
    if (thumbnailPath && videoInfo.thumbnail) {
      writeFileSync(thumbnailPath, videoInfo.thumbnail);
    }
    return {
      width: videoInfo.width,
      height: videoInfo.height,
      time: videoInfo.duration,
      format: videoInfo.format,
      size: fileSize,
      filePath: videoPath,
    };
  }
}