import md5 from '~/utils/md5'

/**
 * 形象照 / 职业照 / 艺术写真（混元生图 3.0）
 *
 * 与老照片同一套链路：create 走 multipart 直传原图，避免先传 CDN 再由后端回源下载一次；
 * 配置、详情、列表等查询类接口用 useApi() 的普通 POST。
 * 一次提交 1~4 张，每张是一个独立的混元子任务、独立计费，失败的不扣点。
 */
export function usePortrait() {
  const tokenCookie = useCookie('token', { path: '/' })
  const macCookie = useCookie('mac', { maxAge: 365 * 24 * 3600, path: '/' })
  const openIdCookie = useCookie('open_id', { path: '/' })
  const sourceCookie = useCookie('source', { path: '/' })
  const tokenState = useState('auth_token', () => tokenCookie.value || '')
  const openIdState = useState('auth_open_id', () => openIdCookie.value || '')

  if (import.meta.client && !macCookie.value) {
    macCookie.value = createUuid()
  }

  function createUuid() {
    if (globalThis.crypto?.randomUUID) return globalThis.crypto.randomUUID()
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (char) => {
      const random = Math.floor(Math.random() * 16)
      const value = char === 'x' ? random : (random & 0x3) | 0x8
      return value.toString(16)
    })
  }

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

  /**
   * 提交生成任务
   * @param {File} file 人像原图
   * @param {object} settings { style, model, ratio, count, extra_prompt, request_id, options }
   *   options 是「选项组 key -> 选项 key」的映射（如 { background: 'white', outfit: 'formal' }），
   *   后端按这些 key 拼提示词，端上不传提示词本身。
   */
  async function create(file, settings = {}) {
    if (!file) throw new Error('请选择一张照片')

    const token = tokenState.value || tokenCookie.value || ''
    const { timeStr, nonce } = getNonce()
    const formData = new FormData()

    // ThinkJS 2 会先读公共参数，普通字段必须排在文件字段之前
    formData.append('token', token)
    formData.append('uid', openIdState.value || openIdCookie.value || '')
    formData.append('mac', macCookie.value || 'pc-portrait')
    formData.append('base_timestamp', String(Math.floor(Date.now() / 1000)))
    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('request_id', settings.request_id || createUuid())
    formData.append('style', settings.style || '')
    formData.append('model', settings.model || '')
    formData.append('ratio', settings.ratio || '')
    formData.append('count', String(settings.count || 1))
    if (settings.extra_prompt) formData.append('extra_prompt', settings.extra_prompt)
    Object.entries(settings.options || {}).forEach(([key, value]) => {
      if (value) formData.append(key, value)
    })
    formData.append('file', file)

    let result
    try {
      result = await $fetch('/api/portrait/create', {
        method: 'POST',
        headers: { token, timestr: timeStr, nonce },
        body: formData,
      })
    } catch (error) {
      const data = error?.data
      if (data && typeof data === 'object' && data.msg) {
        const normalized = new Error(data.msg)
        normalized.code = data.code || 1000
        normalized.data = data.data || {}
        throw normalized
      }
      throw error
    }

    if (result.code === 1009) {
      const { logout, showLogin } = useUser()
      logout()
      showLogin.value = true
    }
    if (result.code !== 0) {
      const error = new Error(result.msg || '提交失败，请稍后重试')
      error.code = result.code || 1000
      error.data = result.data || {}
      throw error
    }
    return result
  }

  return {
    create,
    createRequestId: createUuid,
  }
}