<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasOne;

class LessonAttendance extends Model
{
    protected $fillable = [
        'teaching_arrangement_id',
        'student_teacher_subject_id',
        'scheduled_start',
        'scheduled_end',
        'actual_start',
        'actual_end',
        'week_of_year',
        'status',
        'billable',
        'payable',
        'notes',
    ];

    /**
     * The scheduled arrangement this attendance record belongs to.
     */
    public function arrangement(): BelongsTo
    {
        return $this->belongsTo(TeachingArrangement::class, 'teaching_arrangement_id');
    }

    /**
     * The student–teacher–subject relationship for this attendance.
     */
    public function studentTeacherSubject(): BelongsTo
    {
        return $this->belongsTo(StudentTeacherSubject::class, 'student_teacher_subject_id');
    }

    /**
     * Invoice item generated from this attendance (if billed).
     */
    public function invoiceItem(): HasOne
    {
        return $this->hasOne(InvoiceItem::class, 'attendance_id');
    }

    /**
     * Teacher pay record generated from this attendance (if payable).
     */
    public function payItem(): HasOne
    {
        return $this->hasOne(TeacherPayItem::class, 'attendance_id');
    }
}