/**
 * 后台提现 API
 * GET: 查提现记录。PUT: 查库 + 更新提现状态 + 更新用户已提现金额（当前未接入微信打款）
 */
import { NextResponse } from 'next/server'
import { query } from '@/lib/db'
import { requireAdminResponse } from '@/lib/admin-auth'

/** 安全转数组，避免 undefined.length；绝不返回 undefined */
function toArray<T = any>(x: unknown): T[] {
  if (x == null) return []
  if (Array.isArray(x)) return x as T[]
  if (typeof x === 'object' && x !== null) return [x] as T[]
  return []
}

/** 安全取数组长度，避免对 undefined 读 .length */
function safeLength(x: unknown): number {
  if (x == null) return 0
  if (Array.isArray(x)) return x.length
  return 0
}

// ========== GET：只查提现记录 ==========
export async function GET(request: Request) {
  console.log('[Withdrawals] GET 开始')
  try {
    const authErr = requireAdminResponse(request)
    if (authErr) return authErr

    const sql = `
      SELECT 
        w.id, w.user_id, w.amount, w.status, w.created_at,
        u.nickname as user_nickname, u.avatar as user_avatar
      FROM withdrawals w
      LEFT JOIN users u ON w.user_id = u.id
      ORDER BY w.created_at DESC
      LIMIT 100
    `
    const result = await query(sql)
    const rows = toArray(result)

    const withdrawals = rows.map((w: any) => ({
      id: w.id,
      user_id: w.user_id,
      user_name: w.user_nickname || '未知用户',
      userAvatar: w.user_avatar,
      amount: parseFloat(w.amount) || 0,
      status: w.status === 'success' ? 'completed' : (w.status === 'failed' ? 'rejected' : w.status),
      created_at: w.created_at,
      method: 'wechat',
    }))

    return NextResponse.json({
      success: true,
      withdrawals,
      stats: { total: safeLength(withdrawals) },
    })
  } catch (error: any) {
    console.error('[Withdrawals] GET 失败:', error?.message)
    return NextResponse.json(
      { success: false, error: '获取提现记录失败: ' + (error?.message || String(error)) },
      { status: 500 }
    )
  }
}

// ========== PUT：查库 + 更新状态 + 更新用户已提现，暂不调用微信打款 ==========
export async function PUT(request: Request) {
  const STEP = '[Withdrawals PUT]'
  try {
    console.log(STEP, '1. 开始')
    const authErr = requireAdminResponse(request)
    if (authErr) return authErr
    console.log(STEP, '2. 鉴权通过')

    const body = await request.json()
    console.log(STEP, '3. body 已解析', typeof body, body ? 'ok' : 'null')
    const id = body?.id
    const action = body?.action
    const rejectReason = body?.errorMessage || body?.reason || '管理员拒绝'

    if (!id || !action) {
      return NextResponse.json({ success: false, error: '缺少 id 或 action' }, { status: 400 })
    }
    console.log(STEP, '4. id/action 有效', id, action)

    console.log(STEP, '5. 即将 query SELECT')
    const result = await query('SELECT * FROM withdrawals WHERE id = ?', [id])
    console.log(STEP, '6. query 返回', typeof result, 'length=', safeLength(result))
    const rows = toArray<any>(result)
    console.log(STEP, '7. toArray 后 length=', safeLength(rows))
    if (safeLength(rows) === 0) {
      return NextResponse.json({ success: false, error: '提现记录不存在' }, { status: 404 })
    }
    console.log(STEP, '8. 有记录')

    const row = rows[0]
    console.log(STEP, '9. row', row ? 'ok' : 'null')
    if (row.status !== 'pending') {
      return NextResponse.json({ success: false, error: '该记录已处理，不可重复审批' }, { status: 400 })
    }
    console.log(STEP, '10. 状态 pending')

    const amount = parseFloat(String(row.amount ?? 0)) || 0
    const userId = String(row.user_id ?? '')
    console.log(STEP, '11. amount/userId', amount, userId)

    if (action === 'approve') {
      console.log(STEP, '12. 执行 approve UPDATE withdrawals')
      await query(
        `UPDATE withdrawals SET status = 'success', processed_at = NOW(), transaction_id = ? WHERE id = ?`,
        [`manual_${Date.now()}`, id]
      )
      console.log(STEP, '13. 执行 approve UPDATE users')
      await query(
        `UPDATE users SET withdrawn_earnings = COALESCE(withdrawn_earnings, 0) + ? WHERE id = ?`,
        [amount, userId]
      )
      console.log(STEP, '14. 批准完成')
      return NextResponse.json({ success: true, message: '已批准，已更新提现状态与用户已提现金额（未发起微信打款）' })
    }

    if (action === 'reject') {
      console.log(STEP, '15. 执行 reject UPDATE')
      await query(
        `UPDATE withdrawals SET status = 'failed', processed_at = NOW(), error_message = ? WHERE id = ?`,
        [rejectReason, id]
      )
      console.log(STEP, '16. 拒绝完成')
      return NextResponse.json({ success: true, message: '已拒绝该提现申请' })
    }

    return NextResponse.json({ success: false, error: '无效的 action' }, { status: 400 })
  } catch (error: any) {
    console.error(STEP, '!!! 崩溃 !!!', error?.message)
    console.error(STEP, '堆栈:', error?.stack)
    return NextResponse.json(
      { success: false, error: '审批操作失败: ' + (error?.message || String(error)) },
      { status: 500 }
    )
  }
}