<?php

namespace App\Models;

use App\Models\BaseModel;

class MidtermExam extends BaseModel
{
    protected $table = 'midterm_exam';

    /**
     * CI: useTimestamps = false (even though created_at/updated_at columns exist).
     * Keep it OFF to match behavior (you can still store created_at/updated_at manually).
     */
    public $timestamps = true;

    protected $fillable = [
        'student_id',
        'school_id',
        'class_section_id',
        'updated_by',
        'score',
        'comment',
        'semester',
        'school_year',
        'created_at',
        'updated_at',
    ];

    protected $casts = [
        'student_id'       => 'integer',
        'school_id'        => 'integer',
        'class_section_id' => 'integer',
        'updated_by'       => 'integer',

        // score can be decimal; change to 'integer' if it's whole number
        'score'            => 'decimal:2',

        'created_at'       => 'datetime',
        'updated_at'       => 'datetime',
    ];

    /* Optional relationships */
    public function student()
    {
        return $this->belongsTo(Student::class, 'student_id');
    }

    public function classSection()
    {
        return $this->belongsTo(ClassSection::class, 'class_section_id');
    }

    /**
     * Equivalent of CI getMidtermExamScore()
     */
    public static function getMidtermExamScore(
        int $studentId,
        ?string $semester,
        string $schoolYear,
        ?int $classSectionId = null
    ) {
        $q = static::query()
            ->select('score')
            ->where('student_id', $studentId)
            ->where('school_year', $schoolYear);

        if ($semester !== null && $semester !== '') {
            $q->where('semester', $semester);
        }

        if ($classSectionId !== null) {
            $q->where('class_section_id', $classSectionId);
        }

        $row = $q->first();

        return $row?->score;
    }
}