/**
 * 设备工作状态推送服务
 * 负责向客户端推送设备当前工作状态（任务、指令等）
 */

const db = require('../dbProxy');

class DeviceWorkStatusNotifier {
    constructor() {
        this.mqttClient = null;
    }

    /**
     * 设置 MQTT 客户端
     * @param {object} mqttClient - MQTT 客户端实例
     */
    setMqttClient(mqttClient) {
        this.mqttClient = mqttClient;
    }

    /**
     * 获取 MQTT 客户端
     * @returns {Promise<object>} MQTT 客户端实例
     */
    async getMqttClient() {
        if (this.mqttClient) {
            return this.mqttClient;
        }
        
        // 从调度系统获取 MQTT 客户端（与 taskQueue 保持一致）
        try {
            const scheduleManager = require('./index');
            if (scheduleManager.mqttClient) {
                return scheduleManager.mqttClient;
            }
        } catch (error) {
            // 调度系统未初始化
        }
        
        return null;
    }

    /**
     * 发送设备工作状态（统一方法，包含任务和指令状态）
     * @param {string} sn_code - 设备SN码
     * @param {object} taskStatusSummary - 任务状态摘要（从 taskQueue.getTaskStatusSummary 获取）
     * @param {object} options - 可选参数
     * @param {object} options.currentCommand - 当前执行的指令信息（可选）
     */
    async sendDeviceWorkStatus(sn_code, taskStatusSummary, options = {}) {
        try {
            const mqttClient = await this.getMqttClient();
            if (!mqttClient) {
                return; // MQTT客户端不可用，静默失败
            }

            // 构建设备工作状态数据
            const workStatus = {
                sn_code: taskStatusSummary.sn_code || sn_code,
                timestamp: new Date().toISOString(),
                
                // 当前活动（任务或指令）
                currentActivity: null,
                
                // 待执行队列
                pendingQueue: {
                    count: taskStatusSummary.pendingCount || 0,
                    totalCount: taskStatusSummary.totalPendingCount || 0,
                    nextExecuteTime: taskStatusSummary.nextTaskTime ? new Date(taskStatusSummary.nextTaskTime).toISOString() : null,
                    tasks: taskStatusSummary.pendingTasks || []
                },
                
                // 设备状态（从 deviceManager 获取）
                deviceStatus: {
                    isOnline: true, // 默认在线，实际应从 deviceManager 获取
                    workMode: 'auto'
                }
            };

            // 如果有当前执行的指令，优先显示指令状态
            // 优先从 options 中获取，如果没有则从 taskStatusSummary 中获取
            const currentCommand = options.currentCommand || taskStatusSummary.currentCommand;
            if (currentCommand) {
                const cmd = currentCommand;
                workStatus.currentActivity = {
                    type: 'command',
                    id: cmd.command_id || cmd.id,
                    name: cmd.command_name || cmd.name || '执行指令',
                    description: this._formatCommandDescription(cmd),
                    status: 'running',
                    progress: cmd.progress || 0,
                    startTime: cmd.startTime || cmd.start_time || new Date().toISOString(),
                    commandType: cmd.command_type || cmd.type || '',
                    commandParams: cmd.command_params || cmd.params || {}
                };
            }
            // 如果有当前执行的任务，显示任务状态
            else if (taskStatusSummary.currentTask) {
                const task = taskStatusSummary.currentTask;
                workStatus.currentActivity = {
                    type: 'task',
                    id: task.taskId,
                    name: task.taskName || task.taskType || '未知任务',
                    description: this._formatTaskDescription(task),
                    status: task.status || 'running',
                    progress: task.progress || 0,
                    currentStep: task.currentStep || '',
                    startTime: task.startTime ? new Date(task.startTime).toISOString() : new Date().toISOString()
                };
            }

            // 如果有等待消息（投递间隔等待等），添加到工作状态
            if (options.waitingMessage) {
                workStatus.waitingMessage = options.waitingMessage;
            }

            // 格式化显示文案（服务端统一处理，客户端直接显示）
            workStatus.displayText = this._formatDisplayText(workStatus);
            
            // 格式化下次执行时间显示文案
            if (workStatus.pendingQueue.nextExecuteTime) {
                const nextTime = new Date(workStatus.pendingQueue.nextExecuteTime);
                const now = new Date();
                const diff = nextTime - now;
                
                if (diff < 0) {
                    workStatus.pendingQueue.nextExecuteTimeText = '即将执行';
                } else if (diff < 60000) {
                    workStatus.pendingQueue.nextExecuteTimeText = `${Math.floor(diff / 1000)}秒后`;
                } else if (diff < 3600000) {
                    workStatus.pendingQueue.nextExecuteTimeText = `${Math.floor(diff / 60000)}分钟后`;
                } else if (diff < 86400000) {
                    workStatus.pendingQueue.nextExecuteTimeText = `${Math.floor(diff / 3600000)}小时后`;
                } else {
                    workStatus.pendingQueue.nextExecuteTimeText = nextTime.toLocaleString('zh-CN', {
                        month: '2-digit',
                        day: '2-digit',
                        hour: '2-digit',
                        minute: '2-digit'
                    });
                }
            } else {
                workStatus.pendingQueue.nextExecuteTimeText = '暂无';
            }

            // 通过MQTT发布设备工作状态
            // 主题格式: device_work_status_{sn_code}
            const topic = `device_work_status_${sn_code}`;
            const messagePayload = {
                action: 'device_work_status',
                data: workStatus,
                timestamp: new Date().toISOString()
            };
            const message = JSON.stringify(messagePayload);

            await mqttClient.publish(topic, message);


            if (workStatus.currentActivity) {
                const activity = workStatus.currentActivity;
                const activityInfo = activity.type === 'command'
                    ? `指令[${activity.name}]`
                    : `任务[${activity.name}]`;
                console.log(`  - 当前活动: ${activityInfo}`);
            } else {
                console.log(`  - 当前活动: 无`);
            }

            if (workStatus.waitingMessage) {
                console.log(`  - 等待消息: ${workStatus.waitingMessage.message}`);
            }

            console.log(`  - 待执行: ${workStatus.pendingQueue.totalCount}个`);
            console.log(`  - 下次执行: ${workStatus.pendingQueue.nextExecuteTimeText}`);
            console.log(`  - 消息大小: ${message.length} 字节`);
        } catch (error) {
            // 通知失败不影响任务执行，只记录日志
            console.warn(`[设备工作状态] 推送失败:`, error.message);
        }
    }

    /**
     * 格式化任务描述
     * @private
     */
    _formatTaskDescription(task) {
        if (task.jobTitle || task.companyName) {
            const jobInfo = [];
            if (task.jobTitle) {
                jobInfo.push(task.jobTitle);
            }
            if (task.companyName) {
                const companyName = task.companyName.length > 20 
                    ? task.companyName.substring(0, 20) + '...' 
                    : task.companyName;
                jobInfo.push(companyName);
            }
            if (jobInfo.length > 0) {
                return `投递职位: ${jobInfo.join(' @ ')}`;
            }
        }
        return task.taskName || task.taskType || '未知任务';
    }

    /**
     * 格式化指令描述
     * @private
     */
    _formatCommandDescription(command) {
        const params = command.command_params || command.params || {};
        let parsedParams = {};
        
        if (typeof params === 'string') {
            try {
                parsedParams = JSON.parse(params);
            } catch (e) {
                // 解析失败，忽略
            }
        } else {
            parsedParams = params;
        }
        
        // 根据指令类型格式化描述
        const commandType = command.command_type || command.type || '';
        const commandName = command.command_name || command.name || '';
        
        if (parsedParams.jobTitle && parsedParams.companyName) {
            const companyName = parsedParams.companyName.length > 20 
                ? parsedParams.companyName.substring(0, 20) + '...' 
                : parsedParams.companyName;
            return `投递职位: ${parsedParams.jobTitle} @ ${companyName}`;
        } else if (parsedParams.jobTitle) {
            return `投递职位: ${parsedParams.jobTitle}`;
        } else if (commandType === 'applyJob' || commandName.includes('投递')) {
            return '投递简历';
        } else if (commandType === 'searchJobs' || commandName.includes('搜索')) {
            return `搜索职位: ${parsedParams.keyword || ''}`;
        } else if (commandType === 'sendChatMessage' || commandName.includes('沟通')) {
            return '发送消息';
        } else if (commandName) {
            return commandName;
        }
        return '执行指令';
    }

    /**
     * 格式化整体显示文案（服务端统一处理，客户端直接显示）
     * @private
     */
    _formatDisplayText(workStatus) {
        const parts = [];

        // 当前活动
        if (workStatus.currentActivity) {
            const activity = workStatus.currentActivity;
            const typeText = activity.type === 'command' ? '指令' : '任务';
            const statusText = activity.status === 'running' ? '执行中' :
                             activity.status === 'completed' ? '已完成' :
                             activity.status === 'failed' ? '失败' : '未知';

            // 使用 description 或 name，避免重复显示
            // 如果 description 存在且不等于 name，优先使用 description
            // 否则，使用 name 并可能添加 commandType
            let activityDesc = '';

            if (activity.description && activity.description !== activity.name) {
                // 有独立的 description，直接使用，不再添加 commandType
                activityDesc = activity.description;
            } else {
                // 使用 name
                activityDesc = activity.name;

                // 对于指令，如果 commandType 存在且与 name 不同，添加详细信息
                if (activity.type === 'command') {
                    const cmdType = activity.commandType || '';
                    if (cmdType && cmdType !== activity.name && !activity.name.includes(cmdType)) {
                        activityDesc = `${activityDesc} [${cmdType}]`;
                    }
                }
            }

            parts.push(`${typeText}: ${activityDesc} (${statusText}${activity.progress > 0 ? `, 进度: ${activity.progress}%` : ''})`);
        } else {
            parts.push('当前活动: 无');
        }

        // 如果有等待消息，添加到显示文本
        if (workStatus.waitingMessage) {
            parts.push(workStatus.waitingMessage.message);
        }

        // 待执行数量
        parts.push(`待执行: ${workStatus.pendingQueue.totalCount}个`);

        // 下次执行时间
        parts.push(`下次执行: ${workStatus.pendingQueue.nextExecuteTimeText || '暂无'}`);

        return parts.join(' | ');
    }
}

// 导出单例
const deviceWorkStatusNotifier = new DeviceWorkStatusNotifier();
module.exports = deviceWorkStatusNotifier;