<?php

namespace App\Services\Assignment;

use App\Models\ClassSection;

class AssignmentSectionService
{
    public function __construct(private ClassSection $classSection) {}

    public function getSectionNamesMap(array $sectionIds): array
    {
        if (empty($sectionIds)) {
            return [];
        }

        $map = [];

        $this->classSection
            ->newQuery()
            ->whereIn('class_section_id', $sectionIds)
            ->get()
            ->each(function ($section) use (&$map) {
                $map[(int) $section->class_section_id] = $this->sectionName($section);
            });

        $missing = collect($sectionIds)
            ->map(fn ($id) => (int) $id)
            ->reject(fn ($id) => array_key_exists($id, $map))
            ->values()
            ->all();

        if (! empty($missing)) {
            $this->classSection
                ->newQuery()
                ->whereIn('id', $missing)
                ->get()
                ->each(function ($section) use (&$map) {
                    $map[(int) $section->id] = $this->sectionName($section);
                });
        }

        return $map;
    }

    private function sectionName(ClassSection $section): string
    {
        return (string) (collect([
            $section->class_section_name ?? null,
            $section->section_name ?? null,
            $section->name ?? null,
        ])->first(fn ($value) => trim((string) $value) !== '') ?? '');
    }
}