<?php
// +----------------------------------------------------------------------
// | Niucloud-admin 企业快速开发的多应用管理平台
// +----------------------------------------------------------------------
// | 官方网址：https://www.niucloud.com
// +----------------------------------------------------------------------
// | niucloud团队 版权所有 开源版本可自由商用
// +----------------------------------------------------------------------
// | Author: Niucloud Team
// +----------------------------------------------------------------------

namespace app\job\schedule;

use app\model\course_schedule\CourseSchedule;
use core\base\BaseJob;
use think\facade\Db;
use think\facade\Log;

/**
 * 队列异步调用定时任务
 */
class HandleCourseSchedule extends BaseJob
{
    public function doJob()
    {
        // 添加执行锁，防止重复执行
        $lockFile = runtime_path() . 'course_status_update.lock';
        if (file_exists($lockFile) && (time() - filemtime($lockFile)) < 300) { // 5分钟锁定
            Log::write('课程状态更新任务正在执行中，跳过');
            return ['status' => 'skipped', 'reason' => 'locked'];
        }
        
        // 创建锁文件
        file_put_contents($lockFile, time());
        
        try {
            Log::write('课程状态自动化任务开始' . date('Y-m-d H:i:s'));
            $result = $this->handleCourseStatus();
            Log::write('课程状态自动化任务完成' . date('Y-m-d H:i:s'));
            return $result;
        } finally {
            // 删除锁文件
            if (file_exists($lockFile)) {
                unlink($lockFile);
            }
        }
    }

    private function handleCourseStatus()
    {
        try {
            Db::startTrans();
            
            $currentDate = date('Y-m-d');
            $currentTime = date('H:i:s');
            $currentDateTime = date('Y-m-d H:i:s');
            
            // 先处理time_slot，解析并更新start_time和end_time字段
            $this->updateTimeFields();
            
            $completedCount = 0;
            $upcomingCount = 0;
            $ongoingCount = 0;
            $pendingCount = 0;
            
            // 1. 更新已完成课程：course_date < 当天的课程
            $completedRows = CourseSchedule::where('course_date', '<', $currentDate)
                ->where('status', '<>', 'completed')
                ->update([
                    'status' => 'completed',
                    'updated_at' => time()
                ]);
            $completedCount = $completedRows;
            
            // 2. 处理今天的课程，需要根据时间段判断状态
            $todaySchedules = CourseSchedule::where('course_date', '=', $currentDate)
                ->whereIn('status', ['pending', 'upcoming', 'ongoing'])
                ->select();
            
            foreach ($todaySchedules as $schedule) {
                $startTime = $schedule['start_time'];
                $endTime = $schedule['end_time'];
                
                if (empty($startTime) || empty($endTime)) {
                    // 如果没有解析出时间，尝试从time_slot解析
                    $timeData = $this->parseTimeSlot($schedule['time_slot']);
                    if ($timeData) {
                        $startTime = $timeData['start_time'];
                        $endTime = $timeData['end_time'];
                        
                        // 更新数据库中的时间字段
                        CourseSchedule::where('id', $schedule['id'])->update([
                            'start_time' => $startTime,
                            'end_time' => $endTime
                        ]);
                    } else {
                        continue; // 无法解析时间，跳过
                    }
                }
                
                // 判断课程状态
                $newStatus = $this->determineStatus($currentTime, $startTime, $endTime);
                
                if ($newStatus !== $schedule['status']) {
                    CourseSchedule::where('id', $schedule['id'])->update([
                        'status' => $newStatus,
                        'updated_at' => time()
                    ]);
                    
                    switch ($newStatus) {
                        case 'upcoming':
                            $upcomingCount++;
                            break;
                        case 'ongoing':
                            $ongoingCount++;
                            break;
                        case 'completed':
                            $completedCount++;
                            break;
                        default:
                            $pendingCount++;
                            break;
                    }
                }
            }
            
            // 3. 重置未来日期的课程为pending状态
            $futureRows = CourseSchedule::where('course_date', '>', $currentDate)
                ->where('status', '<>', 'pending')
                ->update([
                    'status' => 'pending',
                    'updated_at' => time()
                ]);
            $pendingCount += $futureRows;
            
            Log::write("课程状态更新完成 - 已完成: {$completedCount}个, 即将开始: {$upcomingCount}个, 进行中: {$ongoingCount}个, 待安排: {$pendingCount}个");
            
            Db::commit();
            
            return [
                'status' => 'success',
                'completed_count' => $completedCount,
                'upcoming_count' => $upcomingCount,
                'ongoing_count' => $ongoingCount,
                'pending_count' => $pendingCount
            ];
            
        } catch (\Exception $e) {
            Db::rollback();
            Log::write('更新课程状态失败：' . $e->getMessage());
            return [
                'status' => 'failed',
                'total_count' => 0,
                'updated_count' => 0,
                'error' => $e->getMessage()
            ];
        }
    }
    
    /**
     * 更新课程安排表的start_time和end_time字段
     */
    private function updateTimeFields()
    {
        try {
            // 查询所有没有start_time或end_time的记录
            $schedules = CourseSchedule::where(function($query) {
                $query->whereNull('start_time')
                    ->whereOr('end_time', null)
                    ->whereOr('start_time', '')
                    ->whereOr('end_time', '');
            })->select();
            
            foreach ($schedules as $schedule) {
                $timeData = $this->parseTimeSlot($schedule['time_slot']);
                if ($timeData) {
                    CourseSchedule::where('id', $schedule['id'])->update([
                        'start_time' => $timeData['start_time'],
                        'end_time' => $timeData['end_time']
                    ]);
                }
            }
        } catch (\Exception $e) {
            Log::write('更新时间字段失败：' . $e->getMessage());
        }
    }
    
    /**
     * 解析time_slot字符串，提取开始和结束时间
     * @param string $timeSlot 格式如 "09:00-10:30"
     * @return array|null
     */
    private function parseTimeSlot($timeSlot)
    {
        if (empty($timeSlot)) {
            return null;
        }
        
        // 支持多种格式：09:00-10:30, 09:00～10:30, 9:00-10:30
        if (preg_match('/(\d{1,2}:\d{2})\s*[-～~]\s*(\d{1,2}:\d{2})/', $timeSlot, $matches)) {
            return [
                'start_time' => $matches[1],
                'end_time' => $matches[2]
            ];
        }
        
        return null;
    }
    
    /**
     * 根据当前时间和课程时间段判断课程状态
     * @param string $currentTime 当前时间 H:i:s
     * @param string $startTime 开始时间 H:i:s
     * @param string $endTime 结束时间 H:i:s
     * @return string
     */
    private function determineStatus($currentTime, $startTime, $endTime)
    {
        $currentTimestamp = strtotime($currentTime);
        $startTimestamp = strtotime($startTime);
        $endTimestamp = strtotime($endTime);
        
        // 如果当前时间在课程时间段内，状态为进行中
        if ($currentTimestamp >= $startTimestamp && $currentTimestamp <= $endTimestamp) {
            return 'ongoing';
        }
        
        // 如果课程已结束，状态为已完成
        if ($currentTimestamp > $endTimestamp) {
            return 'completed';
        }
        
        // 如果距离开始时间不足6小时，状态为即将开始
        $timeDiff = $startTimestamp - $currentTimestamp;
        if ($timeDiff <= 6 * 3600 && $timeDiff > 0) { // 6小时 = 6 * 60 * 60 秒
            return 'upcoming';
        }
        
        // 其他情况为待安排
        return 'pending';
    }
}