<?php

namespace App\Services\ClassPreparation;

use Illuminate\Support\Facades\DB;

class ClassPreparationRosterService
{
    public function getClassSectionStudentCounts(string $schoolYear, string $semester, bool $limitToSemester): array
    {
        $query = DB::table('student_class as sc')
            ->selectRaw('sc.class_section_id, COUNT(DISTINCT sc.student_id) AS student_count')
            ->join('students as s', 's.id', '=', 'sc.student_id')
            ->where('s.is_active', 1)
            ->where('sc.school_year', $schoolYear);

        if ($limitToSemester && $semester !== '') {
            $query->where('sc.semester', $semester);
        }

        return $query->groupBy('sc.class_section_id')->get()->toArray();
    }

    public function getStudentCountForSection(string $schoolYear, string $semester, bool $limitToSemester, string $classSectionId): int
    {
        $query = DB::table('student_class as sc')
            ->selectRaw('COUNT(DISTINCT sc.student_id) AS cnt')
            ->join('students as s', 's.id', '=', 'sc.student_id')
            ->where('s.is_active', 1)
            ->where('sc.class_section_id', $classSectionId)
            ->where('sc.school_year', $schoolYear);

        if ($limitToSemester && $semester !== '') {
            $query->where('sc.semester', $semester);
        }

        $row = $query->first();
        return (int) ($row->cnt ?? 0);
    }
}