/**
 * Pinduoduo Cookie Sync Background Service Worker (Manifest V3)
 * 拼多多 Cookie 自动嗅探与加密保活后台服务
 */

try {
  importScripts('crypto.js')
} catch (e) {
  console.error('导入加密工具失败:', e)
}

const ALARM_NAME = 'pdd_cookie_sync_alarm'
let debounceTimer = null

// 设置扩展图标角标状态
function setExtensionBadge(text, color) {
  chrome.action.setBadgeText({ text })
  if (color) {
    chrome.action.setBadgeBackgroundColor({ color })
  }
}

// 获取拼多多全量 Cookie 字符串
async function getPddCookieString() {
  try {
    const cookies = await chrome.cookies.getAll({ domain: 'pinduoduo.com' })
    if (!cookies || cookies.length === 0) {
      return ''
    }
    // 拼接成标准 Cookie 请求头格式
    return cookies.map((c) => `${c.name}=${c.value}`).join('; ')
  } catch (err) {
    console.error('读取拼多多 Cookie 异常:', err)
    return ''
  }
}

// 核心同步逻辑
async function syncCookieToServer(isManual = false) {
  const config = await chrome.storage.local.get([
    'serverUrl',
    'shopId',
    'syncToken',
    'lastCookieHash',
    'lastSyncAt',
  ])

  const serverUrl = String(config.serverUrl || '').trim().replace(/\/+$/, '')
  const shopId = String(config.shopId || '').trim()
  const syncToken = String(config.syncToken || '').trim()

  if (!serverUrl || !shopId || !syncToken) {
    setExtensionBadge('CFG', '#faad14') // 待配置
    return {
      success: false,
      message: '请先打开插件弹窗完成服务器地址与店铺配对密钥配置',
    }
  }

  // 1. 读取当前 Cookie
  const cookieStr = await getPddCookieString()
  if (!cookieStr) {
    setExtensionBadge('OFF', '#8c8c8c') // 未登录
    await chrome.storage.local.set({
      lastStatus: 'offline',
      lastMessage: '未在浏览器中检测到拼多多商家后台登录 Cookie',
    })
    return {
      success: false,
      message: '未检测到拼多多登录 Cookie，请先在当前浏览器中登录 mms.pinduoduo.com',
    }
  }

  // 2. 计算 Cookie 哈希并进行指纹去重
  const currentHash = await computeSha256(cookieStr)
  const now = Date.now()
  const lastSyncTime = Number(config.lastSyncAt || 0)

  // 若非手动强制触发，且 Cookie 未变动，且距离上次同步不足 1 小时，跳过重复上报
  if (!isManual && config.lastCookieHash === currentHash && now - lastSyncTime < 3600_000) {
    return {
      success: true,
      skipped: true,
      message: 'Cookie 无实质变动，无需重复上报',
    }
  }

  try {
    // 3. 请求服务端公钥
    const pkUrl = `${serverUrl}/api/v1/pdd/extension/public-key`
    const pkResp = await fetch(pkUrl, {
      method: 'GET',
      headers: { Accept: 'application/json' },
    })

    if (!pkResp.ok) {
      throw new Error(`获取公钥失败 HTTP ${pkResp.status}`)
    }

    const pkJson = await pkResp.json()
    const serverPublicKeySpki = pkJson?.data?.publicKeySpki
    if (!serverPublicKeySpki) {
      throw new Error('服务端返回的 RSA 公钥格式异常')
    }

    // 4. 构建明文载荷（syncToken 在加密包内外双重保护）
    const payload = {
      shopId,
      syncToken,
      cookie: cookieStr,
      userAgent: navigator.userAgent,
      timestamp: Date.now(),
      nonce: 'ext_' + Math.random().toString(36).slice(2) + Date.now().toString(36),
    }

    // 5. 执行端到端混合信封加密 (RSA-OAEP + AES-256-GCM)
    const envelope = await encryptPayloadWithEnvelope(payload, serverPublicKeySpki)

    // 6. 安全回传至服务端
    const syncUrl = `${serverUrl}/api/v1/pdd/extension/sync-cookie`
    const syncResp = await fetch(syncUrl, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'X-Shop-Token': syncToken,
      },
      body: JSON.stringify({ envelope }),
    })

    const syncJson = await syncResp.json()

    if (!syncResp.ok || syncJson.code !== 0) {
      const errMsg = syncJson?.message || `服务端返回错误 HTTP ${syncResp.status}`
      throw new Error(errMsg)
    }

    // 同步成功，更新持久化状态
    await chrome.storage.local.set({
      lastCookieHash: currentHash,
      lastSyncAt: now,
      lastStatus: 'ok',
      lastMessage: syncJson.message || '同步成功并已生效',
      totalOrders: syncJson.data?.totalOrders,
    })

    setExtensionBadge('OK', '#52c41a') // 绿色成功
    return {
      success: true,
      message: 'Cookie 同步成功！服务端已完成在线校验并持久化生效',
      totalOrders: syncJson.data?.totalOrders,
    }
  } catch (err) {
    const errMsg = err instanceof Error ? err.message : String(err)
    console.error('Cookie 自动同步失败:', errMsg)

    await chrome.storage.local.set({
      lastStatus: 'error',
      lastMessage: errMsg,
    })

    setExtensionBadge('ERR', '#ff4d4f') // 红色错误
    return {
      success: false,
      message: errMsg,
    }
  }
}

// 监听拼多多 Cookie 实时变动事件（带防抖延时 3 秒）
chrome.cookies.onChanged.addListener((changeInfo) => {
  const domain = changeInfo.cookie?.domain || ''
  if (domain.includes('pinduoduo.com')) {
    if (debounceTimer) {
      clearTimeout(debounceTimer)
    }
    debounceTimer = setTimeout(() => {
      syncCookieToServer(false).catch(() => null)
    }, 3000)
  }
})

// 定时任务：每隔 30 分钟进行一次轻量巡检与必要保活上报
chrome.alarms.onAlarm.addListener((alarm) => {
  if (alarm.name === ALARM_NAME) {
    syncCookieToServer(false).catch(() => null)
  }
})

// 扩展安装或更新时注册定时闹钟
chrome.runtime.onInstalled.addListener(() => {
  chrome.alarms.create(ALARM_NAME, {
    periodInMinutes: 30,
  })
  // 首次运行尝试同步一次
  syncCookieToServer(false).catch(() => null)
})

// 响应来自 popup.js 的前端交互消息
chrome.runtime.onMessage.addListener((req, _sender, sendResponse) => {
  if (req.action === 'trigger_sync') {
    syncCookieToServer(true).then(sendResponse).catch((err) => {
      sendResponse({ success: false, message: String(err) })
    })
    return true // 保持异步通信通道
  }

  if (req.action === 'get_status') {
    getPddCookieString().then((ck) => {
      chrome.storage.local.get(null).then((data) => {
        sendResponse({
          hasCookie: Boolean(ck && ck.length > 20),
          cookieLength: ck ? ck.length : 0,
          storage: data,
        })
      })
    })
    return true
  }
})