/**
 * API 请求封装
 * 处理认证、错误处理、请求拦截
 */

const API_BASE = '/api/v1';

/**
 * API 客户端类
 */
class ApiClient {
    constructor() {
        this.token = localStorage.getItem('token');
        this.tokenExpiry = localStorage.getItem('tokenExpiry');
    }

    /**
     * 保存 Token
     */
    setToken(token, expiresIn) {
        this.token = token;
        const expiry = new Date(Date.now() + expiresIn * 1000);
        this.tokenExpiry = expiry.toISOString();
        localStorage.setItem('token', token);
        localStorage.setItem('tokenExpiry', this.tokenExpiry);
    }

    /**
     * 清除 Token
     */
    clearToken() {
        this.token = null;
        this.tokenExpiry = null;
        localStorage.removeItem('token');
        localStorage.removeItem('tokenExpiry');
    }

    /**
     * 检查 Token 是否有效
     */
    isTokenValid() {
        if (!this.token || !this.tokenExpiry) {
            return false;
        }
        const expiry = new Date(this.tokenExpiry);
        return expiry > new Date();
    }

    /**
     * 获取请求头
     */
    getHeaders() {
        const headers = {
            'Content-Type': 'application/json'
        };

        if (this.token) {
            headers['Authorization'] = `Bearer ${this.token}`;
        }

        return headers;
    }

    /**
     * 处理响应
     */
    async handleResponse(response) {
        if (response.status === 401) {
            // Token 过期或无效
            this.clearToken();
            window.location.reload();
            throw new Error('Authentication failed');
        }

        if (response.status === 204) {
            return null;
        }

        const data = await response.json();

        if (!response.ok) {
            const error = data.error || data.message || 'Request failed';
            throw new Error(error);
        }

        return data;
    }

    /**
     * GET 请求
     */
    async get(url, params = {}) {
        const queryString = new URLSearchParams(params).toString();
        const fullUrl = `${API_BASE}${url}${queryString ? '?' + queryString : ''}`;

        const response = await fetch(fullUrl, {
            method: 'GET',
            headers: this.getHeaders()
        });

        return this.handleResponse(response);
    }

    /**
     * POST 请求
     */
    async post(url, data = {}) {
        const response = await fetch(`${API_BASE}${url}`, {
            method: 'POST',
            headers: this.getHeaders(),
            body: JSON.stringify(data)
        });

        return this.handleResponse(response);
    }

    /**
     * PUT 请求
     */
    async put(url, data = {}) {
        const response = await fetch(`${API_BASE}${url}`, {
            method: 'PUT',
            headers: this.getHeaders(),
            body: JSON.stringify(data)
        });

        return this.handleResponse(response);
    }

    /**
     * DELETE 请求
     */
    async delete(url) {
        const response = await fetch(`${API_BASE}${url}`, {
            method: 'DELETE',
            headers: this.getHeaders()
        });

        return this.handleResponse(response);
    }

    // ============================================
    // 认证 API
    // ============================================

    /**
     * 用户登录
     */
    async login(username, password) {
        const data = await this.post('/auth/login', { username, password });
        this.setToken(data.access_token, data.expires_in);
        return data;
    }

    /**
     * 用户登出
     */
    async logout() {
        try {
            await this.post('/auth/logout');
        } finally {
            this.clearToken();
        }
    }

    /**
     * 验证 Token
     */
    async verifyToken() {
        return await this.post('/auth/verify', { token: this.token });
    }

    /**
     * 获取当前用户信息
     */
    async getCurrentUser() {
        return await this.get('/auth/me');
    }

    // ============================================
    // 系统 API
    // ============================================

    /**
     * 获取系统信息
     */
    async getSystemInfo() {
        return await this.get('/system/info');
    }

    // ============================================
    // 行情 API
    // ============================================

    /**
     * 获取合约列表
     */
    async getContracts() {
        const data = await this.get('/market/contracts');
        return data.contracts || [];
    }

    /**
     * 获取行情数据
     */
    async getTicks(symbols = null) {
        const params = symbols ? { symbols: symbols.join(',') } : {};
        const data = await this.get('/market/ticks', params);
        return data.ticks || [];
    }

    /**
     * 订阅行情
     */
    async subscribe(symbol, exchange, gatewayName = null) {
        return await this.post('/market/subscribe', {
            symbol,
            exchange,
            gateway_name: gatewayName
        });
    }

    /**
     * 取消订阅行情
     */
    async unsubscribe(symbol, exchange, gatewayName = null) {
        return await this.post('/market/unsubscribe', {
            symbol,
            exchange,
            gateway_name: gatewayName
        });
    }

    // ============================================
    // 交易 API
    // ============================================

    /**
     * 获取账户列表
     */
    async getAccounts() {
        return await this.get('/trading/accounts');
    }

    /**
     * 获取持仓列表
     */
    async getPositions() {
        return await this.get('/trading/positions');
    }

    /**
     * 获取订单列表
     */
    async getOrders() {
        return await this.get('/trading/orders');
    }

    /**
     * 获取活动订单
     */
    async getActiveOrders() {
        return await this.get('/trading/orders/active');
    }

    /**
     * 发送订单
     */
    async sendOrder(params) {
        return await this.post('/trading/orders', params);
    }

    /**
     * 撤销订单
     */
    async cancelOrder(orderId) {
        return await this.delete(`/trading/orders/${orderId}`);
    }

    /**
     * 获取成交列表
     */
    async getTrades() {
        return await this.get('/trading/trades');
    }

    /**
     * 获取账户综合信息
     */
    async getAccount() {
        return await this.get('/trading/account');
    }

    // ============================================
    // 策略 API
    // ============================================

    /**
     * 获取策略列表
     */
    async getStrategies() {
        return await this.get('/strategy/list');
    }

    /**
     * 创建策略
     */
    async createStrategy(strategyName, className, setting) {
        return await this.post('/strategy/create', {
            strategy_name: strategyName,
            class_name: className,
            setting
        });
    }

    /**
     * 初始化策略
     */
    async initStrategy(strategyName) {
        return await this.post('/strategy/init', {
            strategy_name: strategyName
        });
    }

    /**
     * 启动策略
     */
    async startStrategy(strategyName) {
        return await this.post('/strategy/start', {
            strategy_name: strategyName
        });
    }

    /**
     * 停止策略
     */
    async stopStrategy(strategyName) {
        return await this.post('/strategy/stop', {
            strategy_name: strategyName
        });
    }

    /**
     * 编辑策略
     */
    async editStrategy(strategyName, setting) {
        return await this.post('/strategy/edit', {
            strategy_name: strategyName,
            setting
        });
    }

    // ============================================
    // 成交监控 API
    // ============================================

    /**
     * 获取所有成交记录
     */
    async getAllTrades() {
        return await this.get('/trades/');
    }

    /**
     * 获取最新成交记录
     */
    async getLatestTrades(limit = 50) {
        return await this.get('/trades/latest', { limit });
    }

    // ============================================
    // 资金监控 API
    // ============================================

    /**
     * 获取所有账户资金
     */
    async getAllAccounts() {
        return await this.get('/accounts/');
    }

    /**
     * 获取资金汇总
     */
    async getAccountSummary() {
        return await this.get('/accounts/summary/total');
    }

    // ============================================
    // 网关管理 API
    // ============================================

    /**
     * 获取所有可用网关
     */
    async getAllGateways() {
        return await this.get('/gateway/list');
    }

    /**
     * 获取网关配置模板
     */
    async getGatewaySetting(name) {
        return await this.get(`/gateway/${name}/setting`);
    }

    /**
     * 连接网关
     */
    async connectGateway(name, setting) {
        return await this.post(`/gateway/${name}/connect`, setting);
    }

    /**
     * 断开网关
     */
    async disconnectGateway(name) {
        return await this.post(`/gateway/${name}/disconnect`);
    }

    // ============================================
    // 全局配置 API
    // ============================================

    /**
     * 获取全局配置
     */
    async getGlobalSettings() {
        return await this.get('/settings/global');
    }

    /**
     * 更新全局配置
     */
    async updateGlobalSettings(settings) {
        return await this.put('/settings/global', settings);
    }

    /**
     * 获取微信通知状态
     */
    async getWechatStatus() {
        return await this.get('/wechat/status');
    }

    /**
     * 绑定微信
     */
    async bindWechat() {
        return await this.post('/wechat/bind');
    }

    /**
     * 解绑微信
     */
    async unbindWechat() {
        return await this.post('/wechat/unbind');
    }

    /**
     * 发送测试消息
     */
    async sendWechatTest() {
        return await this.post('/wechat/test');
    }

    /**
     * 设置微信推送间隔
     */
    async setWechatInterval(interval) {
        return await this.put('/wechat/interval', { interval });
    }
}

// 创建全局 API 客户端实例
const api = new ApiClient();