/**
 * App 下载逻辑（请求对齐 bili-landpage-client，接口域名见 api/btn.ts）
 *
 * - 进页面：bottonlist 拿按钮开关（iosDown / iosStore / iosTF / iosH5 / androidButton），不含下载地址
 * - 点下载：bottonclick 返回 data.link（地址数组），跳 link[index]；同一请求后端记点击
 * - iOS 轻量版：点击直接调 h5/config 下载描述文件（不看开关）；社媒内置浏览器装不了描述文件，只弹「复制到 Safari」引导
 * - iOS 商店版：iosStore(packageType 2) 走 bottonclick 拿 link
 * - 下载前把 { ...query, tid } 写入剪贴板供 App 首启归因
 *
 * 组件接入：
 *   const { init, download, guide, isSocialInApp } = useAppDownload()
 *   onMounted(init)                                   // 拉取按钮开关
 *   <a @click="download(0)">轻量版 / 主包</a>
 *   <a @click="download(1)">商店包</a>
 */
import { ref, computed } from 'vue'
import { useRoute } from 'vue-router'
import { bottonclick, downloadH5, getButtonList } from '~/api/btn'
import type { donwloadParam, H5param } from '~/api/interface'
import { APP_ID } from '~/config/app'
import { copyToClipboard } from '~/utils/clipboard'
import { isSocialInAppBrowser } from '~/utils/isSocialInAppBrowser'
import { renewSessionTraceId } from '~/utils/traceId'

export interface ButtonList {
  iosDown?: boolean
  iosStore?: boolean
  iosTF?: boolean
  iosH5?: boolean
  iosLink?: string
  androidButton?: number
  hasChannelApk?: boolean
  [key: string]: unknown
}

export type DownloadGuide = 'ios' | 'android' | null
export type Terminal = 'ios' | 'android'

// 模块级单例：PC / 手机组件共用同一份按钮开关，init 只请求一次
const buttonList = ref<ButtonList>({})
const ip = ref('')
const ready = ref(false)
let initPromise: Promise<void> | null = null

const isIos = /iphone|ipad|ipod/i.test(navigator.userAgent)
const isWeiXin = /MicroMessenger/i.test(navigator.userAgent)

// 去掉空值后序列化（bili filterChannel）
function filterChannel(query: Record<string, unknown>) {
  const result: Record<string, unknown> = {}
  Object.entries(query).forEach(([key, value]) => {
    if (value) result[key] = value
  })
  return JSON.stringify(result)
}

function jumpToLink(link: string) {
  // 微信内加时间戳，避免命中缓存
  window.location.href = isWeiXin ? link + '?time=' + Date.now() : link
}

async function fetchIp() {
  try {
    const res = await fetch('https://api.ipify.org?format=json')
    const data = await res.json()
    ip.value = data.ip || ''
  } catch (err) {
    console.log('获取外部IP失败' + err)
  }
}

export function useAppDownload() {
  const route = useRoute()
  // 当前要展示的安装引导弹层，由页面组件绑定到 IosInstallGuide / AndroidInstallTip
  const guide = ref<DownloadGuide>(null)

  async function fetchButtonList() {
    try {
      const { data } = await getButtonList({
        appId: APP_ID,
        ip: ip.value,
        channel: JSON.stringify(route.query),
      })
      buttonList.value = (data as ButtonList) || {}
      ready.value = true
    } catch (err) {
      console.log('获取按钮列表失败' + JSON.stringify(err))
    }
  }

  function init() {
    if (!initPromise) {
      initPromise = (async () => {
        await fetchIp()
        await fetchButtonList()
      })()
    }
    return initPromise
  }

  // bottonclick 返回的下载地址数组
  async function fetchLinks(param: donwloadParam): Promise<string[]> {
    const { data } = await bottonclick(param)
    const link = (data as { link?: string[] } | undefined)?.link
    return Array.isArray(link) ? link.filter(Boolean) : []
  }

  async function downloadMobileConfig() {
    const paramData: H5param = {}
    if (route.query.dc) paramData.dc = String(route.query.dc)
    if (route.query.pc) paramData.pc = String(route.query.pc)
    const content = await downloadH5(paramData)
    const file = new File([content], 'descriptionFile.mobileconfig', {
      type: 'application/x-apple-aspen-config',
    })
    const objectUrl = URL.createObjectURL(file)
    const link = document.createElement('a')
    link.href = objectUrl
    link.download = 'descriptionFile.mobileconfig'
    link.click()
    setTimeout(() => URL.revokeObjectURL(objectUrl), 10000)
  }

  // iOS 轻量版：不看 bottonlist 开关，直接调 h5/config 下载描述文件
  async function downloadIosLite() {
    guide.value = 'ios'
    // 社媒内置浏览器无法装描述文件，只展示引导，由页面「复制到 Safari」处理
    if (isSocialInAppBrowser()) return true
    await downloadMobileConfig()
    return true
  }

  // iOS 商店版：后台开了 iosStore 才有入口，走 bottonclick 拿 link
  async function downloadIosStore(param: donwloadParam) {
    if (!buttonList.value.iosStore) return false
    param.type = 'iosStore'
    param.packageType = 2
    const links = await fetchLinks(param)
    if (!links.length) return false
    jumpToLink(links[0])
    return true
  }

  async function downloadAndroid(param: donwloadParam, index: number) {
    // 先弹「安卓安装教程」（断网安装、报毒说明），再跳 APK
    guide.value = 'android'
    const links = await fetchLinks(param)
    const target = links[index] || links[0]
    if (!target) return false
    jumpToLink(target)
    return true
  }

  /**
   * 点击下载，返回是否拿到并开始下载（false 时页面可提示稍后重试）
   * @param index iOS：0 = 轻量版，1 = 商店包；Android：下载地址下标
   * @param terminal 默认按 UA；PC 端弹窗里的 iOS / Android 按钮显式传入
   */
  async function download(index = 0, terminal: Terminal = isIos ? 'ios' : 'android') {
    const trace_id = renewSessionTraceId()
    // 写剪贴板供 App 首次启动读取做安装归因：整包 URL 参数 + tid（海角社区 App 按 tid 读）
    copyToClipboard(JSON.stringify({ ...route.query, tid: trace_id }))

    if (terminal === 'ios' && index !== 1) {
      try {
        return await downloadIosLite()
      } catch (err) {
        console.log('下载描述文件失败' + err)
        return false
      }
    }

    await init()
    const param: donwloadParam = {
      appId: APP_ID,
      ip: ip.value,
      channel: filterChannel(route.query),
      domain: window.location.host || '',
      // bili 默认值，安卓请求同样带 iosH5
      type: 'iosH5',
      terminal,
    }
    try {
      return terminal === 'ios'
        ? await downloadIosStore(param)
        : await downloadAndroid(param, index)
    } catch (err) {
      console.log('下载失败' + JSON.stringify(err))
      return false
    }
  }

  const hasIosStore = computed(() => !!buttonList.value.iosStore)

  // 社媒引导页「复制到 Safari」用：当前落地页地址（带渠道参数）
  const iosInstallUrl = computed(() => window.location.href)

  return {
    buttonList,
    ready,
    isIos,
    hasIosStore,
    isSocialInApp: isSocialInAppBrowser(),
    guide,
    iosInstallUrl,
    init,
    download,
  }
}