<?php

namespace App\Services\School;

use App\Models\Configuration;

class SemesterSelectionService
{
    public function selectedTeacherSemester(): string
    {
        $selected = trim((string) (session()->get('teacher_scores_selected_semester') ?? ''));
        if ($selected !== '') {
            return $this->normalize($selected);
        }

        $fallback = trim((string) (session()->get('semester') ?? ''));
        if ($fallback !== '') {
            return $this->normalize($fallback);
        }

        $configSemester = trim((string) (Configuration::getConfig('semester') ?? ''));
        if ($configSemester !== '') {
            return $this->normalize($configSemester);
        }

        return 'Fall';
    }

    private function normalize(string $value): string
    {
        return ucfirst(strtolower($value));
    }
}