<?php

namespace App\Services\Scheduling;

use App\Models\JadwalKelas;

/**
 * ScheduleGeneratorService adalah kelas koodinator utama yang menghubungkan:
 * Controller <-> DatasetLoader <-> GeneticAlgorithmEngine <-> Database Persistence
 */
class ScheduleGeneratorService
{
    private DatasetLoader $datasetLoader;

    public function __construct()
    {
        $this->datasetLoader = new DatasetLoader();
    }

    /**
     * Jalankan proses penjadwalan otomatis dan simpan hasilnya ke DB.
     */
    public function generate(
        ?string $semester = null,
        ?string $tahunAjaran = null,
        ?int $populationSize = 30,
        ?float $crossoverRate = 0.5,
        ?float $mutationRate = 0.1,
        ?int $maxGenerations = 100,
        ?int $seed = null
    ): array {
        // 1. Load Dataset
        $dataset = $this->datasetLoader->load($semester, $tahunAjaran);

        // 2. Inisialisasi Engine GA
        $engine = new GeneticAlgorithmEngine(
            populationSize: $populationSize ?? 30,
            crossoverRate: $crossoverRate ?? 0.5,
            mutationRate: $mutationRate ?? 0.1,
            maxGenerations: $maxGenerations ?? 100,
            seed: $seed
        );

        // 3. Eksekusi Engine
        $result = $engine->run($dataset);
        /** @var Chromosome $bestChromosome */
        $bestChromosome = $result['bestChromosome'];

        // 4. Simpan/Replace Hasil ke Database (`jadwal_kelas`)
        $this->saveToDatabase($bestChromosome, $semester, $tahunAjaran);

        return [
            'bestChromosome' => $bestChromosome,
            'generations' => $result['generations'],
            'executionTime' => $result['executionTime'],
            'memoryUsage' => $result['memoryUsage'],
            'avgFitness' => $result['avgFitness'] ?? 0,
            'isOptimal' => $result['isOptimal'],
            'totalGenes' => count($bestChromosome->genes),
            'generationLogs' => $result['generationLogs'],
        ];
    }

    /**
     * Persistence hasil terbaik ke tabel `jadwal_kelas`
     */
    private function saveToDatabase(Chromosome $chromosome, ?string $semester, ?string $tahunAjaran): void
    {
        // Kosongkan jadwal sebelumnya untuk periode ini
        JadwalKelas::truncate();

        foreach ($chromosome->genes as $gene) {
            JadwalKelas::create([
                'kelas_id' => $gene->kelasId,
                'guru_id' => $gene->guruId,
                'hari' => $gene->hariId,
                'hari_id' => $gene->hariId,
                'sesi_id' => $gene->sesiId,
                'ruangan_id' => $gene->ruanganId,
                'pertemuan_ke' => $gene->indexPertemuan,
                'created_at' => now(),
                'updated_at' => now(),
            ]);
        }
    }
}