const express = require('express');
const router = express.Router();
const {getDB} = require('../database');
const {agentAuth} = require('../middleware/agentAuth');
const {logger} = require('../config/logger');

/**
 * 获取代理下级用户转账记录列表
 * GET /api/transfers
 */
router.get('/', agentAuth, async (req, res) => {
    try {
        const agentId = req.agent.id;
        const {
            page = 1,
            limit = 20,
            size = 20,
            search,
            status,
            type,
            start_date,
            end_date,
            min_amount,
            max_amount,
            sort_by = 'created_at',
            sort_order = 'desc'
        } = req.query;

        const pageNum = parseInt(page) || 1;
        const limitNum = parseInt(size ||limit ) || 20;
        const offset = (pageNum - 1) * limitNum;

        // 构建查询条件
        let whereConditions = [
            '(am1.agent_id = ? OR am2.agent_id = ?)' // 转出方或转入方属于当前代理
        ];
        let queryParams = [agentId, agentId];

        if (search) {
            whereConditions.push('(u1.username LIKE ? OR u1.real_name LIKE ? OR u1.phone LIKE ? OR u2.username LIKE ? OR u2.real_name LIKE ? OR u2.phone LIKE ?)');
            queryParams.push(`%${search}%`, `%${search}%`, `%${search}%`, `%${search}%`, `%${search}%`, `%${search}%`);
        }

        if (status) {
            whereConditions.push('t.status = ?');
            queryParams.push(status);
        }

        if (type) {
            whereConditions.push('t.source_type = ?');
            queryParams.push(type);
        }

        if (start_date) {
            whereConditions.push('DATE(t.created_at) >= ?');
            queryParams.push(start_date);
        }

        if (end_date) {
            whereConditions.push('DATE(t.created_at) <= ?');
            queryParams.push(end_date);
        }

        if (min_amount) {
            whereConditions.push('t.amount >= ?');
            queryParams.push(parseFloat(min_amount));
        }

        if (max_amount) {
            whereConditions.push('t.amount <= ?');
            queryParams.push(parseFloat(max_amount));
        }

        const whereClause = whereConditions.join(' AND ');

        // 验证排序字段
        const allowedSortFields = ['created_at', 'amount', 'status'];
        const sortBy = allowedSortFields.includes(sort_by) ? sort_by : 'created_at';
        const sortOrder = sort_order.toLowerCase() === 'asc' ? 'ASC' : 'DESC';

        // 查询转账记录列表
        const transfersQuery = `
            SELECT t.id,
                   t.from_user_id,
                   t.to_user_id,
                   t.amount,
                   t.source_type,
                   t.status,
                   t.description,
                   t.matching_order_id,
                   t.created_at,
                   t.updated_at,
                   u1.username  as from_username,
                   u1.real_name as from_real_name,
                   u1.phone     as from_phone,
                   u1.avatar    as from_avatar,
                   u2.username  as to_username,
                   u2.real_name as to_real_name,
                   u2.phone     as to_phone,
                   u2.avatar    as to_avatar,
                   CASE
                       WHEN am1.agent_id = ? THEN 'out'
                       WHEN am2.agent_id = ? THEN 'in'
                       ELSE 'both'
                       END      as direction
            FROM transfers t
                     LEFT JOIN users u1 ON t.from_user_id = u1.id
                     LEFT JOIN users u2 ON t.to_user_id = u2.id
                     LEFT JOIN agent_merchants am1 ON t.from_user_id = am1.merchant_id
                     LEFT JOIN agent_merchants am2 ON t.to_user_id = am2.merchant_id
            WHERE ${whereClause}
            ORDER BY t.${sortBy} ${sortOrder}
      LIMIT ${limitNum}
            OFFSET ${offset}
        `;
        console.log(transfersQuery, [agentId, agentId, ...queryParams]);
        const [transfers] = await getDB().execute(transfersQuery, [agentId, agentId, ...queryParams]);

        // 查询总数
        const countQuery = `
            SELECT COUNT(*) as total
            FROM transfers t
                     LEFT JOIN agent_merchants am1 ON t.from_user_id = am1.merchant_id
                     LEFT JOIN agent_merchants am2 ON t.to_user_id = am2.merchant_id
                     LEFT JOIN users u1 ON t.from_user_id = u1.id
                     LEFT JOIN users u2 ON t.to_user_id = u2.id
            WHERE ${whereClause}
        `;
        console.log(countQuery, [agentId, agentId, ...queryParams]);
        const [countResult] = await getDB().execute(countQuery, [...queryParams]);
        const total = countResult[0]?.total || 0;

        // 查询统计信息
        let statsResult;
        [statsResult] = await getDB().execute(`
            SELECT COUNT(*)                                                    as total_transfers,
                   COUNT(CASE WHEN t.status = 'received' THEN 1 END)          as completed_transfers,
                   COUNT(CASE WHEN t.status = 'pending' THEN 1 END)            as pending_transfers,
                   COUNT(CASE WHEN t.status = 'failed' THEN 1 END)             as failed_transfers,
                   CAST(COALESCE(SUM(CASE WHEN t.status = 'received' THEN t.amount ELSE 0 END),
                                 0) AS DECIMAL(10, 2))                         as total_amount,
                   CAST(COALESCE(
                           SUM(CASE WHEN t.status = 'received' AND DATE (t.created_at) = CURDATE() THEN t.amount ELSE 0
                               END), 0) AS DECIMAL(10, 2))                     as today_amount,
                   COUNT(CASE WHEN DATE (t.created_at) = CURDATE() THEN 1 END) as today_transfers
            FROM transfers t
                     LEFT JOIN agent_merchants am1 ON t.from_user_id = am1.merchant_id
                     LEFT JOIN agent_merchants am2 ON t.to_user_id = am2.merchant_id
            WHERE (am1.agent_id = ? OR am2.agent_id = ?)
        `, [agentId, agentId]);

        const stats = statsResult[0] || {
            total_transfers: 0,
            completed_transfers: 0,
            pending_transfers: 0,
            failed_transfers: 0,
            total_amount: '0.00',
            today_amount: '0.00',
            today_transfers: 0
        };

        res.json({
            success: true,
            data: {
                transfers,
                pagination: {
                    current_page: pageNum,
                    per_page: limitNum,
                    total,
                    total_pages: Math.ceil(total / limitNum)
                },
                stats
            }
        });

    } catch (error) {
        logger.error('获取转账记录失败', {
            error: error.message,
            stack: error.stack,
            agentId: req.agent?.id
        });

        res.status(500).json({
            success: false,
            message: '获取转账记录失败'
        });
    }
});

/**
 * 获取单个转账记录详情
 * GET /api/transfers/:id
 */
router.get('/:id', agentAuth, async (req, res) => {
    try {
        const agentId = req.agent.id;
        const transferId = req.params.id;

        // 查询转账记录详情
        const [transfers] = await getDB().execute(`
            SELECT t.id,
                   t.from_user_id,
                   t.to_user_id,
                   t.amount,
                   t.source_type,
                   t.status,
                   t.description,
                   t.matching_order_id,
                   t.created_at,
                   t.updated_at,
                   u1.username  as from_username,
                   u1.real_name as from_real_name,
                   u1.phone     as from_phone,
                   u1.avatar    as from_avatar,
                   u1.city      as from_city,
                   u1.district  as from_district,
                   u2.username  as to_username,
                   u2.real_name as to_real_name,
                   u2.phone     as to_phone,
                   u2.avatar    as to_avatar,
                   u2.city      as to_city,
                   u2.district  as to_district
            FROM transfers t
                     LEFT JOIN users u1 ON t.from_user_id = u1.id
                     LEFT JOIN users u2 ON t.to_user_id = u2.id
                     LEFT JOIN agent_merchants am1 ON t.from_user_id = am1.merchant_id
                     LEFT JOIN agent_merchants am2 ON t.to_user_id = am2.merchant_id
            WHERE t.id = ?
              AND (am1.agent_id = ? OR am2.agent_id = ?)
        `, [transferId, agentId, agentId]);

        if (transfers.length === 0) {
            return res.status(404).json({
                success: false,
                message: '转账记录不存在或无权限查看'
            });
        }

        const transfer = transfers[0];

        res.json({
            success: true,
            data: transfer
        });

    } catch (error) {
        logger.error('获取转账记录详情失败', {
            error: error.message,
            stack: error.stack,
            agentId: req.agent?.id,
            transferId: req.params.id
        });

        res.status(500).json({
            success: false,
            message: '获取转账记录详情失败'
        });
    }
});

/**
 * 获取转账趋势数据
 * GET /api/transfers/trend
 */
router.get('/trend/data', agentAuth, async (req, res) => {
    try {
        const agentId = req.agent.id;
        const {days = 7, type = 'amount'} = req.query;

        let selectField = 'CAST(COALESCE(SUM(t.amount), 0) AS DECIMAL(10,2)) as value';
        if (type === 'count') {
            selectField = 'COUNT(*) as value';
        }

        const [trendData] = await getDB().execute(`
            SELECT
                DATE (t.created_at) as date, ${selectField}
            FROM transfers t
                LEFT JOIN agent_merchants am1
            ON t.from_user_id = am1.merchant_id
                LEFT JOIN agent_merchants am2 ON t.to_user_id = am2.merchant_id
            WHERE (am1.agent_id = ?
               OR am2.agent_id = ?)
              AND t.status = 'completed'
              AND t.created_at >= DATE_SUB(CURDATE()
                , INTERVAL ? DAY)
            GROUP BY DATE (t.created_at)
            ORDER BY date ASC
        `, [agentId, agentId, parseInt(days)]);

        res.json({
            success: true,
            data: trendData
        });

    } catch (error) {
        logger.error('获取转账趋势失败', {
            error: error.message,
            stack: error.stack,
            agentId: req.agent?.id
        });

        res.status(500).json({
            success: false,
            message: '获取转账趋势失败'
        });
    }
});



module.exports = router;