/**
 * 图片上传 composable，完全对齐 ai_uniapp_v2/utils/upload.js
 *
 * - POST multipart/form-data 到 /api/common/uploadpic（走服务端代理）
 * - Header: { token, timestr, nonce }
 * - FormData: { file, token, mac, client:1, source, version, version_code, upload_type:1 }
 */
import md5 from '~/utils/md5'

export function useUpload() {
  const macCookie = useCookie('mac', { maxAge: 365 * 24 * 3600, path: '/' })
  const tokenCookie = useCookie('token', { path: '/' })
  const openIdCookie = useCookie('open_id', { path: '/' })
  const sourceCookie = useCookie('source', { path: '/' })

  function getNonce() {
    const timeStr = Date.now().toString()
    const str = md5(timeStr)
    const nonce = str.substring(4, 14)
    return { timeStr, nonce }
  }

  /**
   * 上传图片
   * @param {File} file - 浏览器 File 对象
   * @returns {Promise<{code: number, data: {url: string, width: number, height: number}, msg: string}>}
   */
  async function uploadImage(file) {
    if (!file) {
      throw new Error('请选择文件')
    }

    const timestamp = Math.floor(Date.now() / 1000)
    const { timeStr, nonce } = getNonce()
    const formData = new FormData()

    // ThinkJS 2 会在控制器 __before() 中先校验公共参数，因此这些字段
    // 必须位于文件字段之前，否则 multipart 解析时会误报“client必填”。
    formData.append('token', tokenCookie.value || '')
    formData.append('uid', openIdCookie.value || '')
    formData.append('mac', macCookie.value || '')
    formData.append('base_timestamp', timestamp)
    formData.append('client', '1')
    formData.append('source', sourceCookie.value || '')
    formData.append('client_ios', '0')
    formData.append('version', '1.0.0')
    formData.append('version_code', '1')
    formData.append('upload_type', '1')
    formData.append('file', file)

    // 走 /api 代理，对齐 V2
    const url = '/api/common/uploadpic'

    try {
      const result = await $fetch(url, {
        method: 'POST',
        headers: {
          token: tokenCookie.value || '',
          timestr: timeStr,
          nonce,
        },
        body: formData,
        // 不设置 Content-Type，让浏览器自动设置 multipart boundary
      })

      if (result.code === 0) {
        return result
      }

      if (result.code === 1009) {
        const { logout } = useUser()
        logout()
        const showLogin = useState('showLogin', () => false)
        showLogin.value = true
      }

      throw new Error(result.msg || '上传失败')
    } catch (e) {
      if (e.data) {
        const data = typeof e.data === 'string' ? JSON.parse(e.data) : e.data
        if (data && data.code !== undefined) {
          throw new Error(data.msg || '上传失败')
        }
      }
      throw e
    }
  }

  /**
   * 打开文件选择器并上传
   */
  function selectAndUpload(options = {}) {
    const { accept = 'image/*' } = options
    return new Promise((resolve, reject) => {
      const input = document.createElement('input')
      input.type = 'file'
      input.accept = accept
      input.onchange = async () => {
        const file = input.files[0]
        if (!file) {
          reject(new Error('未选择文件'))
          return
        }
        try {
          const result = await uploadImage(file)
          resolve(result)
        } catch (e) {
          reject(e)
        }
      }
      input.click()
    })
  }

  return {
    uploadImage,
    selectAndUpload,
  }
}