<?php

namespace App\Models;

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

class StudentTeacherSubject extends Model
{
    protected $fillable = [
        'student_id',
        'teacher_id',
        'subject_id',
        'rate_override',
        'status',
        'notes',
    ];

    /**
     * The student this relationship belongs to.
     */
    public function student(): BelongsTo
    {
        return $this->belongsTo(StudentProfile::class, 'student_id');
    }

    /**
     * The teacher assigned to this student for this subject.
     */
    public function teacher(): BelongsTo
    {
        return $this->belongsTo(TeacherProfile::class, 'teacher_id');
    }

    /**
     * The subject being taught.
     */
    public function subject(): BelongsTo
    {
        return $this->belongsTo(Subject::class, 'subject_id');
    }

    /**
     * Teaching arrangements (sessions/timetabled slots)
     * linking this student–teacher subject pair to actual classes.
     */
    public function teachingArrangements(): HasMany
    {
        return $this->hasMany(TeachingArrangementStudent::class);
    }

    /**
     * Attendance records for this student–teacher–subject combination.
     */
    public function attendance(): HasMany
    {
        return $this->hasMany(LessonAttendance::class);
    }
}