/**
 * COS直传工具
 * 通过POST Object方式将文件直传到腾讯云COS
 * 参考: https://cloud.tencent.com/document/product/436/14690
 */

import { getPresignedUploadUrl } from '@/api/user.js'

/**
 * 选择图片并上传到COS
 * @param {Object} [options] - 选项
 * @param {number} [options.count=1] - 选择数量
 * @param {string[]} [options.sourceType] - 来源类型
 * @returns {Promise<string>} 上传后的文件URL
 */
export async function chooseAndUploadImage(options = {}) {
  const { count = 1, sourceType = ['album', 'camera'] } = options

  // 1. 选择图片
  const chooseRes = await new Promise((resolve, reject) => {
    uni.chooseImage({
      count,
      sizeType: ['compressed'],
      sourceType,
      success: resolve,
      fail: (err) => {
        if (err.errMsg && err.errMsg.includes('cancel')) {
          reject(new Error('用户取消选择'))
        } else {
          reject(new Error('选择图片失败'))
        }
      }
    })
  })

  const tempFilePath = chooseRes.tempFilePaths[0]
  const fileName = tempFilePath.split('/').pop() || 'image.png'

  // 判断文件类型
  const ext = fileName.split('.').pop()?.toLowerCase() || 'png'
  const mimeMap = { jpg: 'image/jpeg', jpeg: 'image/jpeg', png: 'image/png', gif: 'image/gif', webp: 'image/webp' }
  const contentType = mimeMap[ext] || 'image/png'

  // 2. 获取POST Object签名信息
  const presignedRes = await getPresignedUploadUrl(fileName, contentType)
  if (!presignedRes || presignedRes.code !== 0 || !presignedRes.data) {
    throw new Error(presignedRes?.message || '获取上传地址失败')
  }

  const { uploadUrl, fileUrl, key, policy, secretId, keyTime, signature } = presignedRes.data

  // 3. POST Object方式直传COS
  await new Promise((resolve, reject) => {
    uni.uploadFile({
      url: uploadUrl,
      filePath: tempFilePath,
      name: 'file',
      formData: {
        'key': key,
        'policy': policy,
        'q-sign-algorithm': 'sha1',
        'q-ak': secretId,
        'q-key-time': keyTime,
        'q-sign-time': keyTime,
        'q-signature': signature
      },
      success: (res) => {
        // COS POST Object成功返回 200 或 204
        if (res.statusCode >= 200 && res.statusCode < 300) {
          resolve(res)
        } else {
          console.error('COS上传失败:', res.statusCode, res.data)
          reject(new Error(`上传失败，状态码: ${res.statusCode}`))
        }
      },
      fail: (err) => reject(new Error(err.errMsg || '上传失败'))
    })
  })

  // 4. 返回文件访问URL
  return fileUrl
}