// 媒体查询 API
const GRAPHQL_ENDPOINT = 'http://localhost:8080/api/graphql';

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) => {
  const res = await fetch(GRAPHQL_ENDPOINT, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    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) => {
  const res = await fetch(GRAPHQL_ENDPOINT, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    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) => {
  console.log('=== deleteMedia API调用 ===');
  console.log('要删除的媒体ID:', id);
  console.log('GraphQL查询:', DELETE_MEDIA_MUTATION);
  
  const res = await fetch(GRAPHQL_ENDPOINT, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      query: DELETE_MEDIA_MUTATION,
      variables: { id: id.toString() }
    })
  });
  const result = await res.json();
  console.log('GraphQL响应:', result);
  console.log('deleteMedia结果:', result.data?.deleteMedia);
  
  if (result.errors) {
    console.error('GraphQL错误:', result.errors);
    throw new Error(result.errors[0].message);
  }
  
  const deleteResult = result.data.deleteMedia;
  console.log('返回的删除结果:', deleteResult, '类型:', typeof deleteResult);
  return deleteResult;
};

// 上传文件到服务器
export const uploadFile = async (file) => {
  const formData = new FormData();
  formData.append('file', file);
  
  const response = await fetch('http://localhost:8080/api/upload/image', {
    method: 'POST',
    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 {
    console.log('开始处理视频文件:', videoFile.name);
    
    // 1. 上传原视频文件
    console.log('上传视频文件...');
    const videoUploadResult = await uploadFile(videoFile);
    console.log('视频上传成功:', videoUploadResult);
    
    // 2. 提取视频第一帧
    console.log('提取视频第一帧...');
    const thumbnailBlob = await extractVideoFrame(videoFile);
    console.log('视频帧提取成功，大小:', thumbnailBlob.size);
    
    // 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
    console.log('上传缩略图...');
    const thumbnailUploadResult = await uploadFile(thumbnailFile);
    console.log('缩略图上传成功:', thumbnailUploadResult);
    
    // 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}`);
  }
};