/**
 * 查询用户购买状态 API
 * 用于支付成功后刷新用户的购买记录
 * 
 * GET /api/user/purchase-status?userId=xxx
 */

import { NextRequest, NextResponse } from 'next/server'
import { query } from '@/lib/db'

export async function GET(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url)
    const userId = searchParams.get('userId')

    if (!userId) {
      return NextResponse.json({
        success: false,
        error: '缺少 userId 参数'
      }, { status: 400 })
    }

    // 1. 查询用户基本信息
    const userRows = await query(`
      SELECT 
        id, nickname, avatar, phone, wechat_id,
        referral_code, has_full_book,
        earnings, pending_earnings, referral_count
      FROM users 
      WHERE id = ?
    `, [userId]) as any[]

    if (userRows.length === 0) {
      return NextResponse.json({
        success: false,
        error: '用户不存在'
      }, { status: 404 })
    }

    const user = userRows[0]

    // 2. 从 orders 表查询已购买的章节
    const orderRows = await query(`
      SELECT DISTINCT product_id 
      FROM orders 
      WHERE user_id = ? 
        AND status = 'paid' 
        AND product_type = 'section'
    `, [userId]) as any[]

    const purchasedSections = orderRows.map((row: any) => row.product_id).filter(Boolean)

    // 3. 返回完整购买状态
    return NextResponse.json({
      success: true,
      data: {
        hasFullBook: user.has_full_book || false,
        purchasedSections,
        purchasedCount: purchasedSections.length,
        earnings: parseFloat(user.earnings) || 0,
        pendingEarnings: parseFloat(user.pending_earnings) || 0,
      }
    })

  } catch (error) {
    console.error('[PurchaseStatus] 查询失败:', error)
    return NextResponse.json({
      success: false,
      error: '查询购买状态失败'
    }, { status: 500 })
  }
}