const express = require('express');
const router = express.Router();
const {getDB} = require('../database');
const QRCode = require('qrcode');
const crypto = require('crypto');
const bcrypt = require('bcryptjs');
const {auth} = require('../middleware/auth');
const dayjs = require('dayjs');

// 获取浙江省所有区域列表
router.get('/regions', async (req, res) => {
    try {
        const [regions] = await getDB().execute(
            'SELECT * FROM zhejiang_regions ORDER BY city_name, district_name'
        );
        res.json({success: true, data: regions});
    } catch (error) {
        console.error('获取区域列表失败:', error);
        res.status(500).json({success: false, message: '获取区域列表失败'});
    }
});

// 申请成为区域代理
router.post('/apply', async (req, res) => {
    try {
        const {region_id, real_name, phone, id_card, contact_address} = req.body;

        if (!region_id || !real_name || !phone || !id_card) {
            return res.status(400).json({success: false, message: '请填写完整信息'});
        }

        // 检查该区域是否已有代理（包括所有状态，不仅仅是active）
        const [existingRegionAgent] = await getDB().execute(
            'SELECT id, status FROM regional_agents WHERE region_id = ? AND status IN ("pending", "active")',
            [region_id]
        );

        if (existingRegionAgent.length > 0) {
            const status = existingRegionAgent[0].status;
            if (status === 'active') {
                return res.status(400).json({
                    success: false,
                    message: '该区域已有激活的代理，每个区域只能有一个代理账号'
                });
            } else if (status === 'pending') {
                return res.status(400).json({
                    success: false,
                    message: '该区域已有待审核的代理申请，每个区域只能有一个代理账号'
                });
            }
        }

        // 检查手机号是否已存在用户
        const [existingUser] = await getDB().execute(
            'SELECT id FROM users WHERE phone = ?',
            [phone]
        );

        let userId;
        if (existingUser.length > 0) {
            userId = existingUser[0].id;

            // 检查该用户是否已申请过代理（包括所有状态）
            const [existingUserAgent] = await getDB().execute(
                'SELECT id, status, region_id FROM regional_agents WHERE user_id = ?',
                [userId]
            );

            if (existingUserAgent.length > 0) {
                const agentStatus = existingUserAgent[0].status;
                if (agentStatus === 'active') {
                    return res.status(400).json({
                        success: false,
                        message: '该用户已是其他区域的激活代理，一个用户只能申请一个区域的代理'
                    });
                } else if (agentStatus === 'pending') {
                    return res.status(400).json({
                        success: false,
                        message: '该用户已有待审核的代理申请，一个用户只能申请一个区域的代理'
                    });
                } else if (agentStatus === 'suspended' || agentStatus === 'terminated') {
                    return res.status(400).json({
                        success: false,
                        message: '该用户的代理资格已被暂停或终止，无法重新申请'
                    });
                }
            }
        } else {
            // 创建新用户（为代理申请用户生成临时密码）
            const bcrypt = require('bcryptjs');
            const tempPassword = Math.random().toString(36).slice(-8); // 生成8位临时密码
            const hashedPassword = await bcrypt.hash(tempPassword, 10);

            const [userResult] = await getDB().execute(
                'INSERT INTO users (username, password, phone, real_name, id_card, created_at) VALUES (?, ?, ?, ?, ?, NOW())',
                [phone, hashedPassword, phone, real_name, id_card]
            );
            userId = userResult.insertId;
        }

        // 生成代理编码
        const agentCode = 'AG' + Date.now().toString().slice(-8);

        // 创建代理申请
        await getDB().execute(
            'INSERT INTO regional_agents (user_id, region_id, agent_code, status, created_at) VALUES (?, ?, ?, "pending", NOW())',
            [userId, region_id, agentCode]
        );

        res.json({success: true, message: '申请提交成功，请等待审核'});
    } catch (error) {
        console.error('申请代理失败:', error);
        res.status(500).json({success: false, message: '申请失败'});
    }
});

// 代理登录
router.post('/login', async (req, res) => {
    try {
        const {phone, password} = req.body;

        if (!phone || !password) {
            return res.status(400).json({success: false, message: '请输入手机号和密码'});
        }

        // 先查询用户和代理信息（包含密码用于验证）
        const [agents] = await getDB().execute(
            `SELECT ra.*,
                    u.id as user_id,
                    u.username,
                    u.phone,
                    u.real_name,
                    u.password,
                    u.role,
                    zr.name as city_name,
                    d.name as district_name
             FROM regional_agents ra
                      JOIN users u ON ra.user_id = u.id
                      JOIN china_regions d ON d.code = u.district_id
                      JOIN china_regions zr ON ra.region_id = zr.code
             WHERE u.phone = ?
               AND ra.status = "active"`,
            [phone]
        );

        if (agents.length === 0) {
            return res.status(401).json({success: false, message: '手机号或密码错误，或账户未激活'});
        }

        const agent = agents[0];

        // 验证密码
        const isPasswordValid = await bcrypt.compare(password, agent.password);
        if (!isPasswordValid) {
            return res.status(401).json({success: false, message: '手机号或密码错误，或账户未激活'});
        }

        // 生成JWT token
        const jwt = require('jsonwebtoken');
        const JWT_SECRET = process.env.JWT_SECRET || 'your-secret-key';
        const token = jwt.sign(
            {
                userId: agent.user_id,
                username: agent.username || agent.phone,
                role: agent.role || 'agent',
                agentId: agent.id
            },
            JWT_SECRET,
            {expiresIn: '24h'}
        );

        delete agent.password; // 不返回密码

        res.json({
            success: true,
            data: {
                ...agent,
                token
            },
            message: '登录成功'
        });
    } catch (error) {
        console.error('代理登录失败:', error);
        res.status(500).json({success: false, message: '登录失败'});
    }
});

// 获取代理的商户列表（包含所有商户，标注早期商户状态）
router.get('/merchants/:agent_id',auth, async (req, res) => {
    try {
        const {agent_id} = req.params;
        const {page = 1, limit = 10} = req.query;
        const offset = (page - 1) * limit;

        // 首先获取代理的注册时间
        const [agentInfo] = await getDB().execute(
            `SELECT ra.created_at as agent_created_at, ra.region_id, ra.user_id
             FROM regional_agents ra
             WHERE ra.id = ?`,
            [parseInt(agent_id)]
        );
        const regionId = agentInfo[0].region_id;

        const userId = agentInfo[0].user_id;

        if (!agentInfo || agentInfo.length === 0) {
            return res.status(404).json({success: false, message: '代理不存在'});
        }

        const agentCreatedAt = agentInfo[0].agent_created_at;

        // 获取商户列表（包含所有商户，包括agent_merchants表中的和符合条件的早期商户）
        const [merchants] = await getDB().execute(
            `SELECT u.id,
                    u.username,
                    u.phone,
                    u.real_name,
                    u.created_at,
                    u.audit_status,
                    IFNULL(u.created_at, '未关联') as joined_at,
                    CASE
                        WHEN u.created_at < ? AND u.district_id = ? THEN 1
                        ELSE 0
                        END                         as is_early_merchant,
                    CASE
                        WHEN u.created_at < ? AND u.district_id = ? THEN '早期商户（不记录佣金）'
                        ELSE '正常商户'
                        END                         as merchant_status,
                    (SELECT COUNT(*)
                     FROM matching_orders
                     WHERE initiator_id = u.id
                       AND status = 'completed')    as completed_matches
                    
             FROM users u
             WHERE (u.inviter = ? OR (u.created_at < ? AND u.district_id = ? AND u.role = 'user'))
             ORDER BY u.created_at DESC
             LIMIT ${parseInt(limit)} OFFSET ${parseInt(offset)}`,
            [agentCreatedAt, parseInt(regionId), agentCreatedAt, parseInt(regionId), parseInt(userId), agentCreatedAt, parseInt(regionId)]
        );

        // 获取总数（包括代理关联的商户和符合条件的早期商户）
        const [countResult] = await getDB().execute(
            `SELECT COUNT(*) as total
             FROM users u
             WHERE (u.inviter = ? OR (u.created_at < ? AND u.district_id = ?))`,
            [parseInt(userId), agentCreatedAt, parseInt(regionId)]
        );

        // 获取早期商户统计（从user表获取所有符合条件的早期商户）
        // 早期商户的判断条件：1.早期商户注册时间比代理要早。2.代理商代理的区县与商户的区县一致
        const [earlyMerchantStats] = await getDB().execute(
            `SELECT COUNT(*) as early_merchant_count
             FROM users u
             WHERE u.created_at < ?
               AND u.district_id = ?
               AND u.role = 'user'`,
            [agentCreatedAt, parseInt(regionId)]
        );

        // 获取正常商户统计（包括代理关联的商户，排除符合条件的早期商户）
        const [normalMerchantStats] = await getDB().execute(
            `SELECT COUNT(*) as normal_merchant_count
             FROM users u
             WHERE (u.inviter = ? AND (u.created_at >= ? OR u.district_id != ?))`,
            [parseInt(userId), agentCreatedAt, parseInt(regionId)]
        );

        res.json({
            success: true,
            data: {
                merchants,
                total: parseInt(countResult[0].total),
                page: parseInt(page),
                limit: parseInt(limit),
                stats: {
                    total_merchants: parseInt(countResult[0].total),
                    early_merchants: parseInt(earlyMerchantStats[0].early_merchant_count),
                    normal_merchants: parseInt(normalMerchantStats[0].normal_merchant_count)
                }
            }
        });
    } catch (error) {
        console.error('获取商户列表失败:', error);
        res.status(500).json({success: false, message: '获取商户列表失败'});
    }
});

// 获取代理的佣金记录
router.get('/commissions/:agent_id',auth, async (req, res) => {
    try {
        const {agent_id} = req.params;
        const {id} = req.user
        const {page = 1, limit = 10} = req.query;
        const offset = (page - 1) * limit;

        // 获取佣金记录
        const [commissions] = await getDB().execute(
            `SELECT acr.*, u.username, u.real_name
             FROM transfers acr
                      JOIN users u ON acr.from_user_id = u.id
             WHERE acr.to_user_id = ${parseInt(id)} AND source_type='agent'
             ORDER BY acr.created_at DESC
             LIMIT ${parseInt(limit)} OFFSET ${parseInt(offset)}`
        );

        // 获取总数和总佣金
        const [summary] = await getDB().execute(
            `SELECT COUNT(*)                            as total_records,
                    COALESCE(SUM(amount), 0) as total_commission
             FROM transfers
             WHERE source_type = 'agent' AND to_user_id=${id}`
        );

        // 由于agent_commission_records表没有status字段，设置默认值
        summary[0].paid_commission = summary[0].total_commission;
        summary[0].pending_commission = 0;

        res.json({
            success: true,
            data: {
                commissions,
                summary: summary[0],
                page: parseInt(page),
                limit: parseInt(limit)
            }
        });
    } catch (error) {
        console.error('获取佣金记录失败:', error);
        res.status(500).json({success: false, message: '获取佣金记录失败'});
    }
});

// 获取代理统计信息
router.get('/stats/:agent_id', auth,async (req, res) => {
    try {
        const {agent_id} = req.params;

        // 获取统计数据
        const [stats] = await getDB().execute(
            `SELECT (SELECT COUNT(*) FROM agent_merchants WHERE agent_id = ${parseInt(agent_id)}) as total_merchants,
                    (SELECT COUNT(*)
                     FROM agent_merchants am
                              JOIN users u ON am.merchant_id = u.id
                     WHERE am.agent_id = ${parseInt(agent_id)}
                       AND u.audit_status = 'approved')                                           as approved_merchants,
                    (SELECT COALESCE(SUM(commission_amount), 0)
                     FROM agent_commission_records
                     WHERE agent_id = ${parseInt(agent_id)})                                      as total_commission,
                    (SELECT COALESCE(SUM(commission_amount), 0)
                     FROM agent_commission_records
                     WHERE agent_id = ${parseInt(agent_id)})                                      as paid_commission,
                    (SELECT COUNT(*)
                     FROM registration_codes rc
                              JOIN regional_agents ra ON rc.agent_id = ra.user_id
                     WHERE ra.id = ${parseInt(agent_id)}
                       AND rc.is_used = 1)                                                        as used_codes,
                    (SELECT COUNT(*)
                     FROM registration_codes rc
                              JOIN regional_agents ra ON rc.agent_id = ra.user_id
                     WHERE ra.id = ${parseInt(agent_id)}
                       AND rc.is_used = 0
                       AND rc.expires_at > NOW())                                                 as active_codes`
        );

        res.json({success: true, data: stats[0]});
    } catch (error) {
        console.error('获取统计信息失败:', error);
        res.status(500).json({success: false, message: '获取统计信息失败'});
    }
});

// 获取代理列表
router.get('/list', auth,async (req, res) => {
    try {
        const {page = 1, limit = 10, status, region_id} = req.query;
        const offset = (page - 1) * limit;

        let whereClause = '1=1';
        let params = [];

        if (status) {
            whereClause += ' AND ra.status = ?';
            params.push(status);
        }

        if (region_id) {
            whereClause += ' AND ra.region_id = ?';
            params.push(region_id);
        }

        // 获取代理列表
        const [agents] = await getDB().execute(
            `SELECT ra.*,
                    u.username,
                    u.phone,
                    u.real_name,
                    u.created_at as user_created_at,
                    zr.city_name,
                    zr.district_name,
                    zr.region_code
             FROM regional_agents ra
                      JOIN users u ON ra.user_id = u.id
                      JOIN zhejiang_regions zr ON ra.region_id = zr.id
             WHERE ${whereClause}
             ORDER BY ra.created_at DESC
             LIMIT ${limit} OFFSET ${offset}`
        );

        // 获取总数
        const [countResult] = await getDB().execute(
            `SELECT COUNT(*) as total
             FROM regional_agents ra
                      JOIN users u ON ra.user_id = u.id
                      JOIN zhejiang_regions zr ON ra.region_id = zr.id
             WHERE ${whereClause}`
        );

        const total = countResult[0].total;
        const totalPages = Math.ceil(total / limit);

        res.json({
            success: true,
            data: {
                agents,
                pagination: {
                    page: parseInt(page),
                    limit: parseInt(limit),
                    total,
                    totalPages
                }
            }
        });
    } catch (error) {
        console.error('获取代理列表失败:', error);
        res.status(500).json({success: false, message: '获取代理列表失败'});
    }
});

/**
 * 获取代理佣金趋势数据
 * @route GET /agents/commission-trend/:agent_id
 * @param {string} agent_id - 代理ID
 * @param {string} period - 时间周期 (7d, 30d, 3m)
 * @returns {Object} 佣金趋势数据
 */
router.get('/commission-trend/:agent_id',auth, async (req, res) => {
    try {
        console.log(req.params, 'req.params')
        const {agent_id} = req.params;
        let [agentUserInfo] = await getDB().execute(`
            SELECT u.*
            FROM regional_agents as rg
                     LEFT JOIN users u ON rg.user_id = u.id
            WHERE rg.id = ${agent_id}
        `)
        let userId = agentUserInfo[0].id
        console.log(userId, 'userId')
        const {period = '7d'} = req.query;
        let days;
        switch (period) {
            case '7d':
                days = 7;
                break;
            case '30d':
                days = 30;
                break;
            case '3m':
                days = 90;
                break;
            default:
                days = 7;
        }

        console.log(period, 'period')

        const [trendData] = await getDB().execute(`
            SELECT DATE(created_at)                                 as date,
                   CAST(COALESCE(SUM(amount), 0) AS DECIMAL(10, 2)) as amount
            FROM transfers
            WHERE to_user_id = ?
              AND created_at >= DATE_SUB(CURDATE(), INTERVAL ? DAY)
              AND source_type = 'user_to_agent'
            GROUP BY DATE(created_at)
            ORDER BY date ASC
        `, [userId, parseInt(days)]);

        // 填充缺失的日期（佣金为0）
        const result = [];

        for (let i = days - 1; i >= 0; i--) {
            const date = dayjs().subtract(i, 'day');
            const dateStr = date.format('YYYY-MM-DD');

            const existingData = trendData.find(item => {
                const itemDateStr = dayjs(item.date).format('YYYY-MM-DD');
                return itemDateStr === dateStr;
            });

            result.push({
                date: date.format('MM-DD'),
                amount: existingData ? parseFloat(existingData.amount) : 0
            });
        }

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

    } catch (error) {
        console.log(error);

        res.status(500).json({
            success: false,
            message: '获取趋势数据失败'
        });
    }
});

/**
 * 获取代理商户状态分布数据
 * @route GET /agents/merchant-status/:agent_id
 * @param {string} agent_id - 代理ID
 * @returns {Object} 商户状态分布数据
 */
router.get('/merchant-status/:agent_id',auth, async (req, res) => {
    try {
        const {agent_id} = req.params;
        let [agent] = await getDB().execute(`
            SELECT u.*
            FROM users as u
                     LEFT JOIN regional_agents as rg ON rg.user_id = u.id
            WHERE rg.id = ${agent_id}
        `)
        let userId = agent[0].id
        // 获取商户状态分布
        const [statusData] = await getDB().execute(
            `SELECT CASE
                        WHEN am.audit_status = 'approved' THEN '已审核'
                        WHEN am.audit_status = 'pending' THEN '待审核'
                        WHEN am.audit_status = 'rejected' THEN '已拒绝'
                        ELSE '未知状态'
                        END  as status,
                    COUNT(*) as count
             FROM users am
             WHERE am.inviter = ?
             GROUP BY am.audit_status
             ORDER BY count DESC`,
            [parseInt(userId)]
        );

        res.json({
            success: true,
            data: statusData
        });
    } catch (error) {
        console.error('获取商户状态分布数据失败:', error);
        res.status(500).json({success: false, message: '获取商户状态分布数据失败'});
    }
});

/**
 * 获取代理详细统计数据（包含更多维度）
 * @route GET /agents/detailed-stats/:agent_id
 * @param {string} agent_id - 代理ID
 * @returns {Object} 详细统计数据
 */
router.get('/detailed-stats/:agent_id',auth, async (req, res) => {
    try {
        const {agent_id} = req.params;
        let [agentUserInfo] = await getDB().execute(`
            SELECT u.*
            FROM users as u
                     LEFT JOIN regional_agents as ag ON ag.user_id = u.id
            WHERE ag.id = ${agent_id}
        `)
        let agUserInfo = agentUserInfo[0];
        // 获取基础统计数据
        const [basicStats] = await getDB().execute(
            `SELECT (SELECT COUNT(*) FROM users WHERE inviter = ?) as total_merchants,
                    (SELECT COUNT(*)
                     FROM users am
                     WHERE am.inviter = ?
                       AND am.audit_status = 'approved')           as approved_merchants,
                    (SELECT COUNT(*)
                     FROM users am
                     WHERE am.inviter = ?
                       AND am.audit_status = 'pending')            as pending_merchants,
                    (SELECT COUNT(*)
                     FROM users am
                     WHERE am.inviter = ?
                       AND am.audit_status = 'rejected')           as rejected_merchants,
                    (SELECT COALESCE(SUM(amount), 0)
                     FROM transfers
                     WHERE transfer_type = 'user_to_agent'
                       AND to_user_id = ?)                         as total_commission
            `,
            [parseInt(agUserInfo.id), parseInt(agUserInfo.id), parseInt(agUserInfo.id), parseInt(agUserInfo.id), parseInt(agUserInfo.id)]
        );

        // 获取本月营收
        const [monthlyStats] = await getDB().execute(
            `SELECT COALESCE(SUM(amount), 0) as monthly_commission,
                    COUNT(*)                 as monthly_commission_records
             FROM transfers
             WHERE to_user_id = ?
               AND transfer_type = 'user_to_agent'
               AND YEAR(created_at) = YEAR(CURDATE())
               AND MONTH(created_at) = MONTH(CURDATE())`,
            [parseInt(agUserInfo.id)]
        );

        // 获取今日佣金
        const [dailyStats] = await getDB().execute(
            `SELECT COALESCE(SUM(amount), 0) as daily_commission,
                    COUNT(*)                 as daily_commission_records
             FROM transfers
             WHERE to_user_id = ?
               AND transfer_type = 'user_to_agent'
               AND DATE(created_at) = CURDATE()`,
            [parseInt(agUserInfo.id)]
        );

        // 获取最近7天新增商户数
        const [weeklyMerchants] = await getDB().execute(
            `SELECT COUNT(*) as weekly_new_merchants
             FROM users am
             WHERE am.inviter = ?
               AND am.created_at >= DATE_SUB(CURDATE(), INTERVAL 7 DAY)`,
            [parseInt(agUserInfo.id)]
        );


        // 合并所有统计数据
        const stats = {
            ...basicStats[0],
            ...monthlyStats[0],
            ...dailyStats[0],
            ...weeklyMerchants[0]
        };

        res.json({
            success: true,
            data: stats
        });
    } catch (error) {
        console.error('获取详细统计数据失败:', error);
        res.status(500).json({success: false, message: '获取详细统计数据失败'});
    }
});

/**
 * 获取代理商户的转账记录
 * @route GET /agents/merchants/:agent_id/transfers
 * @param {string} agent_id - 代理ID
 * @param {string} page - 页码
 * @param {string} limit - 每页数量
 * @returns {Object} 转账记录列表
 */
router.get('/merchants/:agent_id/transfers', auth,async (req, res) => {
    try {
        const {agent_id} = req.params;
        const {page = 1, limit = 10} = req.query;
        const pageNum = parseInt(page) || 1;
        const limitNum = parseInt(limit) || 10;
        const offset = (pageNum - 1) * limitNum;

        // 检查代理是否存在
        const [agentResult] = await getDB().execute(
            'SELECT * FROM regional_agents WHERE id = ?',
            [parseInt(agent_id)]
        );

        if (agentResult.length === 0) {
            return res.status(404).json({success: false, message: '代理不存在'});
        }

        // 查询商户转账记录
        const transferQuery = `
            SELECT t.id,
                   t.from_user_id,
                   t.to_user_id,
                   t.amount,
                   t.status,
                   t.transfer_type,
                   t.description,
                   t.created_at,
                   t.confirmed_at,
                   from_user.real_name as from_real_name,
                   from_user.phone     as from_phone,
                   to_user.real_name   as to_real_name,
                   to_user.phone       as to_phone
            FROM agent_merchants am
                     JOIN transfers t ON am.merchant_id = t.from_user_id
                     LEFT JOIN users from_user ON t.from_user_id = from_user.id
                     LEFT JOIN users to_user ON t.to_user_id = to_user.id
            WHERE am.agent_id = ?
            ORDER BY t.created_at DESC
            LIMIT ${limitNum} OFFSET ${offset}
        `;
        const [transfers] = await getDB().execute(transferQuery, [parseInt(agent_id)]);

        // 查询总数
        const [totalResult] = await getDB().execute(
            `SELECT COUNT(*) as total
             FROM agent_merchants am
                      JOIN transfers t ON am.merchant_id = t.from_user_id
             WHERE am.agent_id = ?`,
            [parseInt(agent_id)]
        );

        const total = totalResult[0].total;

        res.json({
            success: true,
            data: {
                transfers,
                pagination: {
                    page: pageNum,
                    limit: limitNum,
                    total,
                    pages: Math.ceil(total / limitNum)
                }
            }
        });
    } catch (error) {
        console.error('获取代理商户转账记录失败:', error);
        res.status(500).json({success: false, message: '获取代理商户转账记录失败，请稍后再试'});
    }
});
/**
 * 获取分销列表
 * @route GET /agents/distribution
 * @returns {Object} 分销列表
 */
router.get('/distribution', auth, async (req, res) => {
    try {

        const {page = 1, size = 10, user_id} = req.query;
        const {id} = user_id || req.user;
        const pageNum = parseInt(page) || 1;
        const limitNum = parseInt(size) || 10;
        const offset = (page - 1) * size;
        const [result] = await getDB().execute(
            `SELECT real_name, phone, username, avatar, created_at, id as user_id
             FROM users
             WHERE inviter = ?
             ORDER BY created_at DESC
             LIMIT ${size} OFFSET ${offset}`,
            [parseInt(id)]
        );
        const [totalResult] = await getDB().execute(
            `SELECT COUNT(*) as total
             FROM users
             WHERE inviter = ? `,
            [parseInt(id)]
        );
        result.forEach(item => {
            item.created_at = dayjs(item.created_at).format('YYYY-MM-DD HH:mm:ss');
        })

        const total = totalResult[0].total;
        res.json({
            success: true, data: result, pagination: {
                page: pageNum,
                limit: limitNum,
                total,
                pages: Math.ceil(total / limitNum)
            }
        });
    } catch (error) {
        console.error('获取分销列表失败:', error);
        res.status(500).json({success: false, message: '获取分销列表失败'});
    }
});

module.exports = router;