const BaseTask = require('./baseTask');
const db = require('../../dbProxy');
const config = require('../infrastructure/config');

/**
 * 自动搜索职位任务
 * 定期搜索符合条件的职位并保存到数据库
 */
class AutoSearchTask extends BaseTask {
    constructor() {
        super('auto_search', {
            defaultInterval: 60,      // 默认60分钟
            defaultPriority: 8,       // 高优先级(比投递高,先搜索后投递)
            requiresLogin: true,      // 需要登录
            conflictsWith: [          // 与这些任务冲突
                'auto_deliver',       // 投递任务
                'auto_active_account' // 活跃账号任务
            ]
        });
    }

    /**
     * 验证任务参数
     */
    validateParams(params) {
        if (!params.keyword && !params.jobType) {
            return {
                valid: false,
                reason: '缺少必要参数: keyword 或 jobType'
            };
        }

        return { valid: true };
    }

    /**
     * 获取任务名称
     */
    getTaskName(params) {
        return `自动搜索 - ${params.keyword || params.jobType || '默认'}`;
    }

    /**
     * 执行自动搜索任务
     */
    async execute(sn_code, params) {
        console.log(`[自动搜索] 设备 ${sn_code} 开始执行搜索任务`);

        // 1. 获取账号信息
        const account = await this.getAccountInfo(sn_code);
        if (!account) {
            throw new Error(`账号 ${sn_code} 不存在`);
        }

        // 2. 获取搜索配置
        const searchConfig = this.parseSearchConfig(account.search_config);

        // 3. 检查日搜索限制
        const dailyLimit = config.dailyLimits.maxSearch || 20;
        const todaySearched = await this.getTodaySearchCount(sn_code);

        if (todaySearched >= dailyLimit) {
            throw new Error(`今日搜索已达上限 (${todaySearched}/${dailyLimit})`);
        }

        // 4. 执行搜索(这里需要调用实际的搜索逻辑)
        const searchResult = {
            success: true,
            keyword: params.keyword || account.keyword,
            pageCount: searchConfig.page_count || 3,
            jobsFound: 0, // 实际搜索到的职位数
            jobsSaved: 0  // 保存到数据库的职位数
        };

        console.log(`[自动搜索] 设备 ${sn_code} 搜索完成,找到 ${searchResult.jobsFound} 个职位`);

        return searchResult;
    }

    /**
     * 获取账号信息
     */
    async getAccountInfo(sn_code) {
        const { pla_account } = db.models;
        const account = await pla_account.findOne({
            where: {
                sn_code: sn_code,
                is_delete: 0,
                is_enabled: 1
            }
        });

        return account ? account.toJSON() : null;
    }

    /**
     * 解析搜索配置
     */
    parseSearchConfig(search_config) {
        if (typeof search_config === 'string') {
            try {
                search_config = JSON.parse(search_config);
            } catch (e) {
                search_config = {};
            }
        }

        return {
            search_interval: search_config?.search_interval || 60,
            page_count: search_config?.page_count || 3,
            city: search_config?.city || '',
            salary_range: search_config?.salary_range || '',
            experience: search_config?.experience || '',
            education: search_config?.education || '',
            time_range: search_config?.time_range || null
        };
    }

    /**
     * 获取今日已搜索数量
     */
    async getTodaySearchCount(sn_code) {
        const { task_status } = db.models;
        const Sequelize = require('sequelize');

        const today = new Date();
        today.setHours(0, 0, 0, 0);

        const count = await task_status.count({
            where: {
                sn_code: sn_code,
                taskType: 'auto_search',
                status: 'completed',
                endTime: {
                    [Sequelize.Op.gte]: today
                }
            }
        });

        return count;
    }

    /**
     * 添加搜索任务到队列
     */
    async addToQueue(sn_code, taskQueue, customParams = {}) {
        const now = new Date();
        console.log(`[自动搜索] ${now.toLocaleString()} 尝试为设备 ${sn_code} 添加任务`);

        try {
            // 1. 获取账号信息
            const account = await this.getAccountInfo(sn_code);
            if (!account) {
                console.log(`[自动搜索] 账号 ${sn_code} 不存在或未启用`);
                return { success: false, reason: '账号不存在或未启用' };
            }

            // 2. 检查是否开启了自动搜索
            if (!account.auto_search) {
                console.log(`[自动搜索] 设备 ${sn_code} 未开启自动搜索`);
                return { success: false, reason: '未开启自动搜索' };
            }

            // 3. 获取搜索配置
            const searchConfig = this.parseSearchConfig(account.search_config);

            // 4. 检查时间范围
            if (searchConfig.time_range) {
                const timeCheck = this.checkTimeRange(searchConfig.time_range);
                if (!timeCheck.allowed) {
                    console.log(`[自动搜索] 设备 ${sn_code} ${timeCheck.reason}`);
                    return { success: false, reason: timeCheck.reason };
                }
            }

            // 5. 执行所有层级的冲突检查
            const conflictCheck = await this.canExecuteTask(sn_code, taskQueue);
            if (!conflictCheck.allowed) {
                return { success: false, reason: conflictCheck.reason };
            }

            // 6. 检查搜索间隔
            const intervalCheck = await this.checkExecutionInterval(
                sn_code,
                searchConfig.search_interval
            );

            if (!intervalCheck.allowed) {
                console.log(`[自动搜索] 设备 ${sn_code} ${intervalCheck.reason}`);
                return { success: false, reason: intervalCheck.reason };
            }

            // 7. 构建任务参数
            const taskParams = {
                keyword: account.keyword || '',
                jobType: account.job_type || '',
                platform: account.platform_type || 'boss',
                pageCount: searchConfig.page_count || 3,
                city: searchConfig.city || '',
                salaryRange: searchConfig.salary_range || '',
                ...customParams
            };

            // 8. 验证参数
            const validation = this.validateParams(taskParams);
            if (!validation.valid) {
                return { success: false, reason: validation.reason };
            }

            // 9. 添加任务到队列
            await taskQueue.addTask(sn_code, {
                taskType: this.taskType,
                taskName: this.getTaskName(taskParams),
                taskParams: taskParams,
                priority: this.config.defaultPriority
            });

            console.log(`[自动搜索] 已为设备 ${sn_code} 添加搜索任务,间隔: ${searchConfig.search_interval} 分钟`);

            return { success: true };

        } catch (error) {
            console.error(`[自动搜索] 添加任务失败:`, error);
            return { success: false, reason: error.message };
        } finally {
            // 统一释放任务锁
            this.releaseTaskLock(sn_code);
        }
    }
}

// 导出单例
module.exports = new AutoSearchTask();