// 媒体选择工具类 - 支持拍照、拍视频、相册选择
class MediaPicker {
  constructor() {
    this.maxImageCount = 9; // 最多选择9张图片
    this.maxVideoCount = 1; // 最多选择1个视频
    this.maxVideoDuration = 60; // 视频最长60秒
    this.maxImageSize = 10 * 1024 * 1024; // 图片最大10MB
    this.maxVideoSize = 100 * 1024 * 1024; // 视频最大100MB
  }

  // 🔥 ===== 图片选择功能 =====

  /**
   * 选择图片 - 支持拍照和相册
   * @param {Object} options 选项
   * @param {number} options.count 最多选择数量，默认9
   * @param {Array} options.sourceType 来源类型 ['album', 'camera']
   * @param {Array} options.sizeType 图片尺寸 ['original', 'compressed']
   * @returns {Promise} 返回选择的图片信息
   */
  async chooseImages(options = {}) {
    const {
      count = this.maxImageCount,
      sourceType = ['album', 'camera'],
      sizeType = ['compressed', 'original']
    } = options;

    try {
      // 优先使用新版API
      if (wx.chooseMedia) {
        return await this.chooseMediaImages({ count, sourceType, sizeType });
      } else {
        return await this.chooseImageLegacy({ count, sourceType, sizeType });
      }
    } catch (error) {
      console.error('❌ 选择图片失败:', error);
      throw error;
    }
  }

  /**
   * 使用新版chooseMedia API选择图片
   */
  chooseMediaImages(options) {
    return new Promise((resolve, reject) => {
      wx.chooseMedia({
        count: options.count,
        mediaType: ['image'],
        sourceType: options.sourceType,
        camera: 'back',
        success: (res) => {

          const images = res.tempFiles.map(file => ({
            path: file.tempFilePath,
            size: file.size,
            type: 'image',
            width: file.width || 0,
            height: file.height || 0,
            duration: 0
          }));

          resolve({
            success: true,
            files: images,
            count: images.length
          });
        },
        fail: (error) => {
          console.error('❌ chooseMedia选择图片失败:', error);
          reject(error);
        }
      });
    });
  }

  /**
   * 使用传统chooseImage API选择图片
   */
  chooseImageLegacy(options) {
    return new Promise((resolve, reject) => {
      wx.chooseImage({
        count: options.count,
        sizeType: options.sizeType,
        sourceType: options.sourceType,
        success: (res) => {

          const images = res.tempFilePaths.map((path, index) => ({
            path: path,
            size: res.tempFiles ? res.tempFiles[index]?.size || 0 : 0,
            type: 'image',
            width: 0,
            height: 0,
            duration: 0
          }));

          resolve({
            success: true,
            files: images,
            count: images.length
          });
        },
        fail: (error) => {
          console.error('❌ chooseImage选择图片失败:', error);
          reject(error);
        }
      });
    });
  }

  // 🔥 ===== 视频选择功能 =====

  /**
   * 选择视频 - 支持拍摄和相册
   * @param {Object} options 选项
   * @param {Array} options.sourceType 来源类型 ['album', 'camera']
   * @param {number} options.maxDuration 最大时长（秒）
   * @param {string} options.camera 摄像头 'front'|'back'
   * @returns {Promise} 返回选择的视频信息
   */
  async chooseVideo(options = {}) {
    const {
      sourceType = ['album', 'camera'],
      maxDuration = this.maxVideoDuration,
      camera = 'back'
    } = options;

    try {
      // 优先使用新版API
      if (wx.chooseMedia) {
        return await this.chooseMediaVideo({ sourceType, maxDuration, camera });
      } else {
        return await this.chooseVideoLegacy({ sourceType, maxDuration, camera });
      }
    } catch (error) {
      console.error('❌ 选择视频失败:', error);
      throw error;
    }
  }

  /**
   * 使用新版chooseMedia API选择视频
   */
  chooseMediaVideo(options) {
    return new Promise((resolve, reject) => {
      wx.chooseMedia({
        count: 1,
        mediaType: ['video'],
        sourceType: options.sourceType,
        maxDuration: options.maxDuration,
        camera: options.camera,
        success: (res) => {

          // 健壮性判断，防止tempFiles为空或无元素
          if (!res.tempFiles || !Array.isArray(res.tempFiles) || res.tempFiles.length === 0) {
            console.warn('⚠️ chooseMedia返回空tempFiles:', res);
            resolve({ success: false, files: [], count: 0, message: '未选择视频' });
            return;
          }
          const video = res.tempFiles[0];
          if (!video || !video.tempFilePath) {
            console.warn('⚠️ chooseMedia返回的video对象异常:', video);
            resolve({ success: false, files: [], count: 0, message: '未选择有效视频' });
            return;
          }
          const videoInfo = {
            path: video.tempFilePath,
            size: video.size,
            type: 'video',
            width: video.width || 0,
            height: video.height || 0,
            duration: video.duration || 0,
            thumbTempFilePath: video.thumbTempFilePath || ''
          };
          resolve({
            success: true,
            files: [videoInfo],
            count: 1
          });
        },
        fail: (error) => {
          console.error('❌ chooseMedia选择视频失败:', error);
          reject(error);
        }
      });
    });
  }

  /**
   * 使用传统chooseVideo API选择视频
   */
  chooseVideoLegacy(options) {
    return new Promise((resolve, reject) => {
      wx.chooseVideo({
        sourceType: options.sourceType,
        maxDuration: options.maxDuration,
        camera: options.camera,
        success: (res) => {

          const videoInfo = {
            path: res.tempFilePath,
            size: res.size || 0,
            type: 'video',
            width: res.width || 0,
            height: res.height || 0,
            duration: res.duration || 0,
            thumbTempFilePath: res.thumbTempFilePath || ''
          };

          resolve({
            success: true,
            files: [videoInfo],
            count: 1
          });
        },
        fail: (error) => {
          console.error('❌ chooseVideo选择视频失败:', error);
          reject(error);
        }
      });
    });
  }

  // 🔥 ===== 混合媒体选择功能 =====

  /**
   * 选择混合媒体 - 图片和视频
   * @param {Object} options 选项
   * @returns {Promise} 返回选择的媒体信息
   */
  async chooseMedia(options = {}) {
    const {
      count = 9,
      mediaType = ['image', 'video'],
      sourceType = ['album', 'camera'],
      maxDuration = this.maxVideoDuration,
      camera = 'back'
    } = options;

    if (!wx.chooseMedia) {
      throw new Error('当前微信版本不支持chooseMedia API');
    }

    return new Promise((resolve, reject) => {
      wx.chooseMedia({
        count: count,
        mediaType: mediaType,
        sourceType: sourceType,
        maxDuration: maxDuration,
        camera: camera,
        success: (res) => {

          const files = res.tempFiles.map(file => ({
            path: file.tempFilePath,
            size: file.size,
            type: file.fileType, // 'image' 或 'video'
            width: file.width || 0,
            height: file.height || 0,
            duration: file.duration || 0,
            thumbTempFilePath: file.thumbTempFilePath || ''
          }));

          resolve({
            success: true,
            files: files,
            count: files.length
          });
        },
        fail: (error) => {
          console.error('❌ chooseMedia选择媒体失败:', error);
          reject(error);
        }
      });
    });
  }

  // 🔥 ===== 工具方法 =====

  /**
   * 检查文件大小
   */
  checkFileSize(file) {
    const maxSize = file.type === 'image' ? this.maxImageSize : this.maxVideoSize;
    if (file.size > maxSize) {
      const maxSizeMB = Math.round(maxSize / 1024 / 1024);
      throw new Error(`文件大小超过限制，最大支持${maxSizeMB}MB`);
    }
    return true;
  }

  /**
   * 获取文件信息
   */
  async getFileInfo(filePath) {
    return new Promise((resolve, reject) => {
      wx.getFileInfo({
        filePath: filePath,
        success: resolve,
        fail: reject
      });
    });
  }

  /**
   * 显示选择媒体的操作菜单
   */
  showMediaActionSheet(options = {}) {
    const {
      showCamera = true,
      showAlbum = true,
      showVideo = true
    } = options;

    const itemList = [];
    const actions = [];

    if (showCamera) {
      itemList.push('拍照');
      actions.push(() => this.chooseImages({ sourceType: ['camera'] }));
    }

    if (showAlbum) {
      itemList.push('从相册选择图片');
      actions.push(() => this.chooseImages({ sourceType: ['album'] }));
    }

    if (showVideo) {
      itemList.push('拍摄视频');
      actions.push(() => this.chooseVideo({ sourceType: ['camera'] }));

      itemList.push('从相册选择视频');
      actions.push(() => this.chooseVideo({ sourceType: ['album'] }));
    }

    return new Promise((resolve, reject) => {
      wx.showActionSheet({
        itemList: itemList,
        success: (res) => {
          const selectedAction = actions[res.tapIndex];
          if (selectedAction) {
            selectedAction().then(resolve).catch(reject);
          }
        },
        fail: (error) => {
          if (error.errMsg !== 'showActionSheet:fail cancel') {
            reject(error);
          }
        }
      });
    });
  }
}

// 创建全局单例
const mediaPicker = new MediaPicker();

module.exports = mediaPicker;