<?php

namespace App\Models;

class CourseContentEvaluation extends SoftDeletesModel
{
    protected $casts = ['audience_course_ids' => 'array'];

    public function availabilityError(): ?array
    {
        $now = \Illuminate\Support\Carbon::now();
        if ($this->start_time) {
            $start = \Illuminate\Support\Carbon::parse($this->start_time);
            if ($start->greaterThan($now)) {
                $formatted = $start->format($start->format('H:i:s') === '00:00:00' ? 'Y年m月d日' : 'Y年m月d日 H:i:s');
                return ['access_state' => 'not_started', 'access_error' => '该问卷尚未开始，请于'.$formatted.'后扫码打开该问卷。'];
            }
        }
        if ((int) $this->status !== 1) return ['access_state' => 'draft', 'access_error' => '该问卷还未开始。'];
        if ($this->end_time && \Illuminate\Support\Carbon::parse($this->end_time)->lessThanOrEqualTo($now)) {
            return ['access_state' => 'ended', 'access_error' => '该问卷已结束。'];
        }
        return null;
    }

    public function participationError($userId): ?string
    {
        if ($this->audience_course_ids && !CourseSign::where('user_id', $userId)->whereIn('course_id', $this->audience_course_ids)->where('status', 1)->exists()) return '您还未报名相关课程';
        return null;
    }

    protected $appends = ['course_content'];

    public function getCourseContentAttribute()
    {
        if (empty($this->course_content_id)) {
            return [];
        }
        $course_content_id = explode(',', $this->course_content_id);
        return CourseContent::whereIn('id', $course_content_id)->get();
    }

    public function course()
    {
        return $this->belongsTo(Course::class, 'course_id', 'id');
    }

    public function courseContentEvaluationAsks()
    {
        return $this->hasMany(CourseContentEvaluationAsk::class, 'course_content_evaluation_id', 'id');
    }

    public function courseContentEvaluationForms()
    {
        return $this->hasMany(CourseContentEvaluationForm::class, 'course_content_evaluation_id', 'id');
    }

}