/**
 * 小程序登录API
 * 使用code换取openId和session_key
 * 
 * 小程序配置:
 * - AppID: wxb8bbb2b10dec74aa
 * - AppSecret: 85d3fa31584d06acdb1de4a597d25b7b
 */

import { NextResponse } from 'next/server'

const MINIPROGRAM_CONFIG = {
  appId: 'wxb8bbb2b10dec74aa',
  appSecret: '85d3fa31584d06acdb1de4a597d25b7b',
}

/**
 * POST - 小程序登录，获取openId
 */
export async function POST(request: Request) {
  try {
    const body = await request.json()
    const { code } = body

    if (!code) {
      return NextResponse.json({
        success: false,
        error: '缺少登录code'
      }, { status: 400 })
    }

    console.log('[MiniLogin] 收到登录请求, code:', code.slice(0, 10) + '...')

    // 调用微信接口获取openId
    const wxUrl = `https://api.weixin.qq.com/sns/jscode2session?appid=${MINIPROGRAM_CONFIG.appId}&secret=${MINIPROGRAM_CONFIG.appSecret}&js_code=${code}&grant_type=authorization_code`

    const response = await fetch(wxUrl)
    const data = await response.json()

    console.log('[MiniLogin] 微信接口返回:', {
      errcode: data.errcode,
      errmsg: data.errmsg,
      hasOpenId: !!data.openid,
    })

    if (data.errcode) {
      return NextResponse.json({
        success: false,
        error: `微信登录失败: ${data.errmsg || data.errcode}`
      }, { status: 400 })
    }

    const openId = data.openid
    const sessionKey = data.session_key
    const unionId = data.unionid

    if (!openId) {
      return NextResponse.json({
        success: false,
        error: '获取openId失败'
      }, { status: 500 })
    }

    // 创建或更新用户
    // TODO: 这里应该连接数据库操作
    const user = {
      id: `user_${openId.slice(-8)}`,
      openId,
      nickname: '微信用户',
      avatar: '',
      referralCode: 'SOUL' + Date.now().toString(36).toUpperCase().slice(-6),
      purchasedSections: [],
      hasFullBook: false,
      earnings: 0,
      pendingEarnings: 0,
      referralCount: 0,
      createdAt: new Date().toISOString()
    }

    // 生成token
    const token = `tk_${openId.slice(-8)}_${Date.now()}`

    console.log('[MiniLogin] 登录成功, userId:', user.id)

    return NextResponse.json({
      success: true,
      data: {
        openId,
        sessionKey, // 注意：生产环境不应返回sessionKey给前端
        unionId,
        user,
        token,
      }
    })

  } catch (error) {
    console.error('[MiniLogin] 登录失败:', error)
    return NextResponse.json({
      success: false,
      error: '登录失败'
    }, { status: 500 })
  }
}