// src/services/mockSocketService.js
/**
 * Mock Socket 服务 - 用于开发环境模拟实时推送
 * 模拟金融资讯、事件动向、分析报告等实时消息推送
 */

import { logger } from '../utils/logger';
import { NOTIFICATION_TYPES, PRIORITY_LEVELS } from '../constants/notificationTypes';

// 模拟金融资讯数据
const mockFinancialNews = [
    // ========== 公告通知 ==========
    {
        type: NOTIFICATION_TYPES.ANNOUNCEMENT,
        priority: PRIORITY_LEVELS.IMPORTANT,
        title: '贵州茅台发布2024年度财报公告',
        content: '2024年度营收同比增长15.2%，净利润创历史新高，董事会建议每10股派息180元',
        publishTime: new Date('2024-03-28T15:30:00').getTime(),
        pushTime: Date.now(),
        isAIGenerated: false,
        clickable: true,
        link: '/event-detail/ann001',
        extra: {
            announcementType: '财报',
            companyCode: '600519',
            companyName: '贵州茅台',
        },
        autoClose: 10000,
    },
    {
        type: NOTIFICATION_TYPES.ANNOUNCEMENT,
        priority: PRIORITY_LEVELS.URGENT,
        title: '宁德时代发布重大资产重组公告',
        content: '公司拟收购某新能源材料公司100%股权，交易金额约120亿元，预计增厚业绩20%',
        publishTime: new Date('2024-03-28T09:00:00').getTime(),
        pushTime: Date.now(),
        isAIGenerated: false,
        clickable: true,
        link: '/event-detail/ann002',
        extra: {
            announcementType: '重组',
            companyCode: '300750',
            companyName: '宁德时代',
        },
        autoClose: 12000,
    },
    {
        type: NOTIFICATION_TYPES.ANNOUNCEMENT,
        priority: PRIORITY_LEVELS.NORMAL,
        title: '中国平安发布分红派息公告',
        content: '2023年度利润分配方案：每10股派发现金红利23.0元（含税），分红率达30.5%',
        publishTime: new Date('2024-03-27T16:00:00').getTime(),
        pushTime: Date.now(),
        isAIGenerated: false,
        clickable: true,
        link: '/event-detail/ann003',
        extra: {
            announcementType: '分红',
            companyCode: '601318',
            companyName: '中国平安',
        },
        autoClose: 10000,
    },

    // ========== 股票动向 ==========
    {
        type: NOTIFICATION_TYPES.STOCK_ALERT,
        priority: PRIORITY_LEVELS.URGENT,
        title: '您关注的股票触发预警',
        content: '宁德时代(300750) 当前价格 ¥245.50，盘中涨幅达 +5.2%，已触达您设置的目标价位',
        publishTime: Date.now(),
        pushTime: Date.now(),
        isAIGenerated: false,
        clickable: true,
        link: '/stock-overview?code=300750',
        extra: {
            stockCode: '300750',
            stockName: '宁德时代',
            priceChange: '+5.2%',
            currentPrice: '245.50',
            triggerType: '目标价',
        },
        autoClose: 10000,
    },
    {
        type: NOTIFICATION_TYPES.STOCK_ALERT,
        priority: PRIORITY_LEVELS.IMPORTANT,
        title: '您关注的股票异常波动',
        content: '比亚迪(002594) 5分钟内跌幅达 -3.8%，当前价格 ¥198.20，建议关注',
        publishTime: Date.now(),
        pushTime: Date.now(),
        isAIGenerated: false,
        clickable: true,
        link: '/stock-overview?code=002594',
        extra: {
            stockCode: '002594',
            stockName: '比亚迪',
            priceChange: '-3.8%',
            currentPrice: '198.20',
            triggerType: '异常波动',
        },
        autoClose: 10000,
    },
    {
        type: NOTIFICATION_TYPES.STOCK_ALERT,
        priority: PRIORITY_LEVELS.NORMAL,
        title: '持仓股票表现',
        content: '隆基绿能(601012) 今日表现优异，涨幅 +4.5%，您当前持仓浮盈 +¥8,200',
        publishTime: Date.now(),
        pushTime: Date.now(),
        isAIGenerated: false,
        clickable: true,
        link: '/trading-simulation',
        extra: {
            stockCode: '601012',
            stockName: '隆基绿能',
            priceChange: '+4.5%',
            profit: '+8200',
        },
        autoClose: 8000,
    },

    // ========== 事件动向 ==========
    {
        type: NOTIFICATION_TYPES.EVENT_ALERT,
        priority: PRIORITY_LEVELS.IMPORTANT,
        title: '央行宣布降准0.5个百分点',
        content: '中国人民银行宣布下调金融机构存款准备金率0.5个百分点，释放长期资金约1万亿元，利好股市',
        publishTime: new Date('2024-03-28T09:00:00').getTime(),
        pushTime: Date.now(),
        isAIGenerated: false,
        clickable: true,
        link: '/event-detail/evt001',
        extra: {
            eventId: 'evt001',
            relatedStocks: 12,
            impactLevel: '重大利好',
            sectors: ['银行', '地产', '基建'],
        },
        autoClose: 12000,
    },
    {
        type: NOTIFICATION_TYPES.EVENT_ALERT,
        priority: PRIORITY_LEVELS.IMPORTANT,
        title: '新能源汽车补贴政策延期',
        content: '财政部宣布新能源汽车购置补贴政策延长至2024年底，涉及比亚迪、理想汽车等5家龙头企业',
        publishTime: new Date('2024-03-28T10:30:00').getTime(),
        pushTime: Date.now(),
        isAIGenerated: false,
        clickable: true,
        link: '/event-detail/evt002',
        extra: {
            eventId: 'evt002',
            relatedStocks: 5,
            impactLevel: '重大利好',
            sectors: ['新能源汽车'],
        },
        autoClose: 12000,
    },
    {
        type: NOTIFICATION_TYPES.EVENT_ALERT,
        priority: PRIORITY_LEVELS.NORMAL,
        title: '芯片产业扶持政策出台',
        content: '工信部发布《半导体产业发展指导意见》，未来三年投入500亿专项资金支持芯片研发',
        publishTime: new Date('2024-03-27T14:00:00').getTime(),
        pushTime: Date.now(),
        isAIGenerated: false,
        clickable: true,
        link: '/event-detail/evt003',
        extra: {
            eventId: 'evt003',
            relatedStocks: 8,
            impactLevel: '中长期利好',
            sectors: ['半导体', '芯片设计'],
        },
        autoClose: 10000,
    },

    // ========== 预测通知 ==========
    {
        type: NOTIFICATION_TYPES.EVENT_ALERT,
        priority: PRIORITY_LEVELS.NORMAL,
        title: '【预测】央行可能宣布降准政策',
        content: '基于最新宏观数据分析，预计央行将在本周宣布降准0.5个百分点，释放长期资金',
        publishTime: Date.now(),
        pushTime: Date.now(),
        isAIGenerated: true,
        clickable: false,  // ❌ 不可点击
        link: null,
        extra: {
            isPrediction: true,
            statusHint: '详细报告生成中...',
            relatedPredictionId: 'pred_001',
        },
        autoClose: 15000,
    },
    {
        type: NOTIFICATION_TYPES.EVENT_ALERT,
        priority: PRIORITY_LEVELS.NORMAL,
        title: '【预测】新能源补贴政策或将延期',
        content: '根据政策趋势分析，财政部可能宣布新能源汽车购置补贴政策延长至2025年底',
        publishTime: Date.now(),
        pushTime: Date.now(),
        isAIGenerated: true,
        clickable: false,  // ❌ 不可点击
        link: null,
        extra: {
            isPrediction: true,
            statusHint: '详细报告生成中...',
            relatedPredictionId: 'pred_002',
        },
        autoClose: 15000,
    },

    // ========== 分析报告 ==========
    {
        type: NOTIFICATION_TYPES.ANALYSIS_REPORT,
        priority: PRIORITY_LEVELS.IMPORTANT,
        title: '医药行业深度报告：创新药迎来政策拐点',
        content: 'CXO板块持续受益于全球创新药研发外包需求，建议关注药明康德、凯莱英等龙头企业',
        publishTime: new Date('2024-03-28T08:00:00').getTime(),
        pushTime: Date.now(),
        author: {
            name: '李明',
            organization: '中信证券',
        },
        isAIGenerated: false,
        clickable: true,
        link: '/forecast-report?id=rpt001',
        extra: {
            reportType: '行业研报',
            industry: '医药',
            rating: '强烈推荐',
        },
        autoClose: 12000,
    },
    {
        type: NOTIFICATION_TYPES.ANALYSIS_REPORT,
        priority: PRIORITY_LEVELS.IMPORTANT,
        title: 'AI产业链投资机会分析',
        content: '随着大模型应用加速落地，算力、数据、应用三大方向均存在投资机会，重点关注海光信息、寒武纪',
        publishTime: new Date('2024-03-28T07:30:00').getTime(),
        pushTime: Date.now(),
        author: {
            name: '王芳',
            organization: '招商证券',
        },
        isAIGenerated: true,
        clickable: true,
        link: '/forecast-report?id=rpt002',
        extra: {
            reportType: '策略报告',
            industry: '人工智能',
            rating: '推荐',
        },
        autoClose: 12000,
    },
    {
        type: NOTIFICATION_TYPES.ANALYSIS_REPORT,
        priority: PRIORITY_LEVELS.NORMAL,
        title: '比亚迪：新能源汽车龙头业绩持续超预期',
        content: '2024年销量目标400万辆，海外市场拓展顺利，维持"买入"评级，目标价280元',
        publishTime: new Date('2024-03-27T09:00:00').getTime(),
        pushTime: Date.now(),
        author: {
            name: '张伟',
            organization: '国泰君安',
        },
        isAIGenerated: false,
        clickable: true,
        link: '/forecast-report?id=rpt003',
        extra: {
            reportType: '公司研报',
            industry: '新能源汽车',
            rating: '买入',
            targetPrice: '280',
        },
        autoClose: 10000,
    },
    {
        type: NOTIFICATION_TYPES.ANALYSIS_REPORT,
        priority: PRIORITY_LEVELS.NORMAL,
        title: '2024年A股市场展望：结构性行情延续',
        content: 'AI应用、高端制造、自主可控三大主线贯穿全年，建议关注科技成长板块配置机会',
        publishTime: new Date('2024-03-26T16:00:00').getTime(),
        pushTime: Date.now(),
        author: {
            name: 'AI分析师',
            organization: '价值前沿',
        },
        isAIGenerated: true,
        clickable: true,
        link: '/forecast-report?id=rpt004',
        extra: {
            reportType: '策略报告',
            industry: '市场策略',
            rating: '谨慎乐观',
        },
        autoClose: 10000,
    },
];

class MockSocketService {
    constructor() {
        this.connected = false;
        this.listeners = new Map();
        this.intervals = [];
        this.messageQueue = [];
        this.reconnectAttempts = 0;
        this.customReconnectTimer = null;
        this.failConnection = false; // 是否模拟连接失败
    }

    /**
     * 计算指数退避延迟（Mock 模式使用更短的时间便于测试）
     * 第1次: 10秒, 第2次: 20秒, 第3次: 40秒, 第4次及以后: 40秒
     */
    getReconnectionDelay(attempt) {
        const delays = [10000, 20000, 40000]; // 10s, 20s, 40s (缩短10倍便于测试)
        const index = Math.min(attempt - 1, delays.length - 1);
        return delays[index];
    }

    /**
     * 连接到 mock socket
     */
    connect() {
        if (this.connected) {
            logger.warn('mockSocketService', 'Already connected');
            return;
        }

        logger.info('mockSocketService', 'Connecting to mock socket service...');

        // 模拟连接延迟
        setTimeout(() => {
            // 检查是否应该模拟连接失败
            if (this.failConnection) {
                logger.warn('mockSocketService', 'Simulated connection failure');

                // 触发连接错误事件
                this.emit('connect_error', {
                    message: 'Mock connection error for testing',
                    timestamp: Date.now(),
                });

                // 安排下次重连（会继续失败，直到 failConnection 被清除）
                this.scheduleReconnection();
                return;
            }

            // 正常连接成功
            this.connected = true;
            this.reconnectAttempts = 0;

            // 清除自定义重连定时器
            if (this.customReconnectTimer) {
                clearTimeout(this.customReconnectTimer);
                this.customReconnectTimer = null;
            }

            logger.info('mockSocketService', 'Mock socket connected successfully');

            // 触发连接成功事件
            this.emit('connect', { timestamp: Date.now() });

            // 在连接后3秒发送欢迎消息
            setTimeout(() => {
                if (this.connected) {
                    this.emit('new_event', {
                        type: 'system_notification',
                        severity: 'info',
                        title: '连接成功',
                        message: '实时消息推送服务已启动 (Mock 模式)',
                        timestamp: Date.now(),
                        autoClose: 5000,
                    });
                }
            }, 3000);
        }, 1000);
    }

    /**
     * 断开连接
     * @param {boolean} triggerReconnect - 是否触发自动重连（模拟意外断开）
     */
    disconnect(triggerReconnect = false) {
        if (!this.connected) {
            return;
        }

        logger.info('mockSocketService', 'Disconnecting from mock socket service...');

        // 清除所有定时器
        this.intervals.forEach(interval => clearInterval(interval));
        this.intervals = [];

        const wasConnected = this.connected;
        this.connected = false;
        this.emit('disconnect', {
            timestamp: Date.now(),
            reason: triggerReconnect ? 'transport close' : 'io client disconnect'
        });

        // 如果需要触发重连（模拟意外断开）
        if (triggerReconnect && wasConnected) {
            this.scheduleReconnection();
        } else {
            // 清除重连定时器
            if (this.customReconnectTimer) {
                clearTimeout(this.customReconnectTimer);
                this.customReconnectTimer = null;
            }
            this.reconnectAttempts = 0;
        }
    }

    /**
     * 使用指数退避策略安排重连
     */
    scheduleReconnection() {
        // 清除之前的定时器
        if (this.customReconnectTimer) {
            clearTimeout(this.customReconnectTimer);
        }

        this.reconnectAttempts++;
        const delay = this.getReconnectionDelay(this.reconnectAttempts);
        logger.info('mockSocketService', `Scheduling reconnection in ${delay / 1000}s (attempt ${this.reconnectAttempts})`);

        // 触发 connect_error 事件通知UI
        this.emit('connect_error', {
            message: 'Mock connection error for testing',
            timestamp: Date.now(),
        });

        this.customReconnectTimer = setTimeout(() => {
            if (!this.connected) {
                logger.info('mockSocketService', 'Attempting reconnection...', {
                    attempt: this.reconnectAttempts,
                });
                this.connect();
            }
        }, delay);
    }

    /**
     * 手动重连
     * @returns {boolean} 是否触发重连
     */
    reconnect() {
        if (this.connected) {
            logger.info('mockSocketService', 'Already connected, no need to reconnect');
            return false;
        }

        logger.info('mockSocketService', 'Manually triggering reconnection...');

        // 清除自动重连定时器
        if (this.customReconnectTimer) {
            clearTimeout(this.customReconnectTimer);
            this.customReconnectTimer = null;
        }

        // 重置重连计数
        this.reconnectAttempts = 0;

        // 立即触发重连
        this.connect();

        return true;
    }

    /**
     * 模拟意外断线（测试用）
     * @param {number} duration - 断线持续时间（毫秒），0表示需要手动重连
     */
    simulateDisconnection(duration = 0) {
        logger.info('mockSocketService', `Simulating disconnection${duration > 0 ? ` for ${duration}ms` : ' (manual reconnect required)'}...`);

        if (duration > 0) {
            // 短暂断线，自动重连
            this.disconnect(true);
        } else {
            // 需要手动重连
            this.disconnect(false);
        }
    }

    /**
     * 模拟持续连接失败（测试用）
     * 连接会一直失败，直到调用 allowReconnection()
     */
    simulateConnectionFailure() {
        logger.info('mockSocketService', '🚫 Simulating persistent connection failure...');
        logger.info('mockSocketService', 'Connection will keep failing until allowReconnection() is called');

        // 设置失败标志
        this.failConnection = true;

        // 如果当前已连接，先断开并触发重连（会失败）
        if (this.connected) {
            this.disconnect(true);
        } else {
            // 如果未连接，直接触发一次连接尝试（会失败）
            this.connect();
        }
    }

    /**
     * 允许重连成功（测试用）
     * 清除连接失败标志，下次重连将会成功
     */
    allowReconnection() {
        logger.info('mockSocketService', '✅ Allowing reconnection to succeed...');
        logger.info('mockSocketService', 'Next reconnection attempt will succeed');

        // 清除失败标志
        this.failConnection = false;

        // 不立即重连，等待自动重连或手动重连
    }

    /**
     * 监听事件
     * @param {string} event - 事件名称
     * @param {Function} callback - 回调函数
     */
    on(event, callback) {
        if (!this.listeners.has(event)) {
            this.listeners.set(event, []);
        }
        this.listeners.get(event).push(callback);

        logger.info('mockSocketService', `Event listener added: ${event}`);
    }

    /**
     * 移除事件监听
     * @param {string} event - 事件名称
     * @param {Function} callback - 回调函数
     */
    off(event, callback) {
        if (!this.listeners.has(event)) {
            return;
        }

        const callbacks = this.listeners.get(event);
        const index = callbacks.indexOf(callback);

        if (index !== -1) {
            callbacks.splice(index, 1);
            logger.info('mockSocketService', `Event listener removed: ${event}`);
        }

        // 如果没有监听器了，删除该事件
        if (callbacks.length === 0) {
            this.listeners.delete(event);
        }
    }

    /**
     * 触发事件
     * @param {string} event - 事件名称
     * @param {*} data - 事件数据
     */
    emit(event, data) {
        if (!this.listeners.has(event)) {
            return;
        }

        const callbacks = this.listeners.get(event);
        callbacks.forEach(callback => {
            try {
                callback(data);
            } catch (error) {
                logger.error('mockSocketService', 'emit', error, { event, data });
            }
        });
    }

    /**
     * 启动模拟消息推送
     * @param {number} interval - 推送间隔（毫秒）
     * @param {number} burstCount - 每次推送的消息数量（1-3条）
     */
    startMockPush(interval = 15000, burstCount = 1) {
        if (!this.connected) {
            logger.warn('mockSocketService', 'Cannot start mock push: not connected');
            return;
        }

        logger.info('mockSocketService', `Starting mock push: interval=${interval}ms, burst=${burstCount}`);

        const pushInterval = setInterval(() => {
            // 随机选择 1-burstCount 条消息
            const count = Math.floor(Math.random() * burstCount) + 1;

            for (let i = 0; i < count; i++) {
                // 从模拟数据中随机选择一条
                const randomIndex = Math.floor(Math.random() * mockFinancialNews.length);
                const alert = {
                    ...mockFinancialNews[randomIndex],
                    timestamp: Date.now(),
                    id: `mock_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`,
                };

                // 延迟发送（模拟层叠效果）
                setTimeout(() => {
                    this.emit('new_event', alert);
                    logger.info('mockSocketService', 'Mock notification sent', alert);
                }, i * 500); // 每条消息间隔500ms
            }
        }, interval);

        this.intervals.push(pushInterval);
    }

    /**
     * 停止模拟推送
     */
    stopMockPush() {
        this.intervals.forEach(interval => clearInterval(interval));
        this.intervals = [];
        logger.info('mockSocketService', 'Mock push stopped');
    }

    /**
     * 手动触发一条测试消息
     * @param {object} customData - 自定义消息数据（可选）
     */
    sendTestNotification(customData = null) {
        const notification = customData || {
            type: 'trade_alert',
            severity: 'info',
            title: '测试消息',
            message: '这是一条手动触发的测试消息',
            timestamp: Date.now(),
            autoClose: 5000,
            id: `test_${Date.now()}`,
        };

        this.emit('new_event', notification);
        logger.info('mockSocketService', 'Test notification sent', notification);
    }

    /**
     * 获取连接状态
     */
    isConnected() {
        return this.connected;
    }

    /**
     * 获取当前重连尝试次数
     */
    getReconnectAttempts() {
        return this.reconnectAttempts;
    }

    /**
     * 获取最大重连次数（Mock 模式无限重试）
     */
    getMaxReconnectAttempts() {
        return Infinity;
    }
}

// 导出单例
export const mockSocketService = new MockSocketService();

// 开发模式下添加全局测试函数
if (process.env.NODE_ENV === 'development') {
    window.__mockSocket = {
        // 模拟意外断线（自动重连成功）
        simulateDisconnection: () => {
            logger.info('mockSocketService', '🔌 Simulating disconnection (will auto-reconnect)...');
            mockSocketService.simulateDisconnection(1); // 触发自动重连
        },

        // 模拟持续连接失败
        simulateConnectionFailure: () => {
            logger.info('mockSocketService', '🚫 Simulating connection failure (will keep retrying)...');
            mockSocketService.simulateConnectionFailure();
        },

        // 允许重连成功
        allowReconnection: () => {
            logger.info('mockSocketService', '✅ Allowing next reconnection to succeed...');
            mockSocketService.allowReconnection();
        },

        // 获取连接状态
        isConnected: () => {
            const connected = mockSocketService.isConnected();
            logger.info('mockSocketService', `Connection status: ${connected ? '✅ Connected' : '❌ Disconnected'}`);
            return connected;
        },

        // 手动重连
        reconnect: () => {
            logger.info('mockSocketService', '🔄 Manually triggering reconnection...');
            return mockSocketService.reconnect();
        },

        // 获取重连尝试次数
        getAttempts: () => {
            const attempts = mockSocketService.getReconnectAttempts();
            logger.info('mockSocketService', `Current reconnection attempts: ${attempts}`);
            return attempts;
        },
    };

    logger.info('mockSocketService', '💡 Mock Socket test functions available:');
    logger.info('mockSocketService', '  __mockSocket.simulateDisconnection() - 模拟断线（自动重连成功）');
    logger.info('mockSocketService', '  __mockSocket.simulateConnectionFailure() - 模拟连接失败（持续失败）');
    logger.info('mockSocketService', '  __mockSocket.allowReconnection() - 允许重连成功');
    logger.info('mockSocketService', '  __mockSocket.isConnected() - 查看连接状态');
    logger.info('mockSocketService', '  __mockSocket.reconnect() - 手动重连');
    logger.info('mockSocketService', '  __mockSocket.getAttempts() - 查看重连次数');
}

export default mockSocketService;