// 媒体查询 API
import { graphqlRequest, API_CONFIG } from '../config/api.ts';

const GRAPHQL_ENDPOINT = API_CONFIG.GRAPHQL_ENDPOINT;

const MEDIAS_BY_TARGET_QUERY = `
  query MediasByTarget($targetType: Int!, $targetId: ID!) {
    mediasByTarget(targetType: $targetType, targetId: $targetId) {
      id
      name
      path
      fileExt
      mediaType
      fullUrl
    }
  }
`;

const SAVE_MEDIA_MUTATION = `
  mutation SaveMedia($input: MediaInput!) {
    saveMedia(input: $input) {
      id
      name
      path
      fileExt
      mediaType
      fullUrl
      targetType
      targetId
    }
  }
`;

const DELETE_MEDIA_MUTATION = `
  mutation DeleteMedia($id: ID!) {
    deleteMedia(id: $id)
  }
`;

export const getMediasByTarget = async (targetType, targetId) => {
  // 获取JWT token
  const { getToken } = await import('@/utils/auth');
  const token = getToken();
  const headers = { 'Content-Type': 'application/json' };
  if (token) {
    headers['Authorization'] = `Bearer ${token}`;
  }

  const res = await fetch(GRAPHQL_ENDPOINT, {
    method: 'POST',
    headers: headers,
    body: JSON.stringify({
      query: MEDIAS_BY_TARGET_QUERY,
      variables: { targetType, targetId }
    })
  });
  const result = await res.json();
  if (result.errors) {
    throw new Error(result.errors[0].message);
  }
  return result.data.mediasByTarget || [];
};

export const saveMedia = async (input) => {
  // 获取JWT token
  const { getToken } = await import('@/utils/auth');
  const token = getToken();
  const headers = { 'Content-Type': 'application/json' };
  if (token) {
    headers['Authorization'] = `Bearer ${token}`;
  }

  const res = await fetch(GRAPHQL_ENDPOINT, {
    method: 'POST',
    headers: headers,
    body: JSON.stringify({
      query: SAVE_MEDIA_MUTATION,
      variables: { input }
    })
  });
  const result = await res.json();
  if (result.errors) {
    throw new Error(result.errors[0].message);
  }
  return result.data.saveMedia;
};

export const deleteMedia = async (id) => {
  try {
    const variables = { id: parseInt(id) };
    
    // 发送GraphQL请求
    const result = await graphqlRequest(DELETE_MEDIA_MUTATION, variables);
    
    // 检查返回结果
    const deleteResult = result.data?.deleteMedia;
    
    return deleteResult;
  } catch (error) {
    throw new Error(`删除媒体失败: ${error.message}`);
  }
};

// 上传文件到服务器
export const uploadFile = async (file) => {
  const formData = new FormData();
  formData.append('file', file);
  
  // 获取JWT token
  const { getToken } = await import('@/utils/auth');
  const token = getToken();
  const headers = {};
  if (token) {
    headers['Authorization'] = `Bearer ${token}`;
  }
  
  const response = await fetch('http://localhost:8080/api/upload/image', {
    method: 'POST',
    headers: headers,
    body: formData
  });
  
  const result = await response.json();
  if (!result.success) {
    throw new Error(result.error || '上传失败');
  }
  
  return result;
};

// 上传视频文件并自动生成缩略图
export const uploadVideoWithThumbnail = async (videoFile) => {
  const { extractVideoFrame, generateThumbnailFileName } = await import('@/utils/video.js');
  
  try {
    // 1. 上传视频文件
    const videoUploadResult = await uploadFile(videoFile);
    
    // 2. 提取视频第一帧
    const thumbnailBlob = await extractVideoFrame(videoFile);
    
    // 3. 创建缩略图文件对象
    const thumbnailFileName = generateThumbnailFileName(videoFile.name);
    const thumbnailFile = new File([thumbnailBlob], thumbnailFileName, {
      type: 'image/jpeg'
    });
    
    // 4. 上传缩略图
    const thumbnailUploadResult = await uploadFile(thumbnailFile);
    
    // 5. 返回包含视频和缩略图信息的结果
    return {
      video: videoUploadResult,
      thumbnail: thumbnailUploadResult,
      success: true
    };
    
  } catch (error) {
    console.error('视频处理失败:', error);
    throw new Error(`视频处理失败: ${error.message}`);
  }
};

// 新版保存媒体（SaveMediaV2）：使用字符串 targetType 与 MediaSaveInput
// 注意：目前后端仅支持 targetType: "player"（学员头像 -> 6）与 "activity_player"（报名资料 -> 5）。
// 字段命名与旧版不同：fileName 替代 name；可选 thumbPath；mediaType: 1图片、2视频、3音频、4文档。
const SAVE_MEDIA_V2_MUTATION = `
  mutation SaveMediaV2($input: MediaSaveInput!) {
    saveMediaV2(input: $input) {
      success
      message
      mediaId
    }
  }
`;

// 统一的 V2 保存接口（返回 { success, message, mediaId }），示例：
// await saveMediaV2({ targetType: 'player', targetId: 123, path: 'avatar/xxx.jpg', fileName: 'avatar.jpg', fileExt: 'jpg', fileSize: 2048, mediaType: 1 })
export const saveMediaV2 = async (input) => {
  const res = await fetch(GRAPHQL_ENDPOINT, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      query: SAVE_MEDIA_V2_MUTATION,
      variables: { input }
    })
  });
  const result = await res.json();
  if (result.errors) {
    throw new Error(result.errors[0].message);
  }
  return result.data.saveMediaV2;
};