<?php

namespace App\Console\Commands;

use App\Models\CourseContent;
use App\Models\Teacher;
use Illuminate\Console\Command;

class SyncTeacherDirection extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'sync:teacher_direction';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = '从courseContents同步课程方向到teachers表的direction字段';

    /**
     * Create a new command instance.
     *
     * @return void
     */
    public function __construct()
    {
        parent::__construct();
    }

    /**
     * Execute the console command.
     *
     * @return mixed
     */
    public function handle()
    {
        $this->info('开始同步老师课程方向...');
        
        // 获取所有有课程内容的老师
        $teachers = Teacher::whereHas('courseContents', function ($query) {
            $query->whereNotNull('direction')
                ->where('direction', '!=', '');
        })->get();

        $total = $teachers->count();
        if ($total == 0) {
            return $this->info('没有需要同步的老师');
        }

        $this->info("共找到 {$total} 个老师需要同步");
        $bar = $this->output->createProgressBar($total);
        $bar->start();

        $updatedCount = 0;
        foreach ($teachers as $teacher) {
            // 获取该老师所有课程内容的direction
            $courseContents = CourseContent::where('teacher_id', $teacher->id)
                ->whereNotNull('direction')
                ->where('direction', '!=', '')
                ->get();

            if ($courseContents->isEmpty()) {
                $bar->advance();
                continue;
            }

            // 收集所有direction值
            $allDirections = [];
            foreach ($courseContents as $content) {
                if (!empty($content->direction)) {
                    // 将逗号分隔的字符串拆分成数组
                    $directions = explode(',', $content->direction);
                    foreach ($directions as $direction) {
                        $direction = trim($direction);
                        if (!empty($direction)) {
                            $allDirections[] = $direction;
                        }
                    }
                }
            }

            if (empty($allDirections)) {
                $bar->advance();
                continue;
            }

            // 去重并合并现有direction
            $existingDirections = [];
            if (!empty($teacher->direction)) {
                $existingDirections = array_map('trim', explode(',', $teacher->direction));
                $existingDirections = array_filter($existingDirections);
            }

            // 合并并去重
            $mergedDirections = array_unique(array_merge($existingDirections, $allDirections));
            $mergedDirections = array_filter($mergedDirections); // 移除空值

            // 排序并重新组合
            sort($mergedDirections);
            $newDirection = implode(',', $mergedDirections);

            // 如果direction有变化，则更新
            if ($teacher->direction !== $newDirection) {
                $teacher->direction = $newDirection;
                $teacher->save();
                $updatedCount++;
            }

            $bar->advance();
        }

        $bar->finish();
        $this->newLine();
        $this->info("同步完成，共更新 {$updatedCount} 个老师的课程方向");
        
        return 0;
    }
}