<?php

declare(strict_types=1);

namespace App\Models;

use DateTimeImmutable;
use PDO;

final class VacationModel extends BaseModel
{
    public function all(?string $schoolYear = null): array
    {
        $sql = "SELECT id_periode, libelle, date_debut, date_fin, annee_scolaire,
                       academie, zone, source, date_creation
                FROM periode_vacance
                WHERE actif = TRUE";
        $params = [];

        if ($schoolYear !== null && $schoolYear !== '') {
            $sql .= ' AND annee_scolaire = :annee_scolaire';
            $params['annee_scolaire'] = $schoolYear;
        }

        $sql .= ' ORDER BY date_debut, libelle';
        $stmt = $this->pdo->prepare($sql);
        $stmt->execute($params);
        return $stmt->fetchAll();
    }

    public function saveMany(array $periods): int
    {
        if ($periods === []) {
            return 0;
        }

        $sql = "INSERT INTO periode_vacance
                    (libelle, date_debut, date_fin, annee_scolaire, academie, zone, source, actif)
                VALUES
                    (:libelle, :date_debut, :date_fin, :annee_scolaire, :academie, :zone, :source, TRUE)
                ON DUPLICATE KEY UPDATE
                    libelle = VALUES(libelle),
                    zone = VALUES(zone),
                    source = VALUES(source),
                    actif = TRUE";
        $stmt = $this->pdo->prepare($sql);

        $this->pdo->beginTransaction();
        try {
            foreach ($periods as $period) {
                $stmt->execute([
                    'libelle' => $period['libelle'],
                    'date_debut' => $period['date_debut'],
                    'date_fin' => $period['date_fin'],
                    'annee_scolaire' => $period['annee_scolaire'],
                    'academie' => $period['academie'],
                    'zone' => $period['zone'],
                    'source' => $period['source'],
                ]);
            }
            $this->pdo->commit();
        } catch (\Throwable $e) {
            if ($this->pdo->inTransaction()) {
                $this->pdo->rollBack();
            }
            throw $e;
        }

        return count($periods);
    }

    public function delete(int $id): bool
    {
        $stmt = $this->pdo->prepare('DELETE FROM periode_vacance WHERE id_periode = :id');
        $stmt->execute(['id' => $id]);
        return $stmt->rowCount() > 0;
    }

    public function periodsBetween(string $startDate, string $endDate): array
    {
        $stmt = $this->pdo->prepare(
            "SELECT id_periode, libelle, date_debut, date_fin, annee_scolaire, academie, zone, source
             FROM periode_vacance
             WHERE actif = TRUE
               AND date_debut <= :date_fin
               AND date_fin >= :date_debut
             ORDER BY date_debut"
        );
        $stmt->execute([
            'date_debut' => $startDate,
            'date_fin' => $endDate,
        ]);
        return $stmt->fetchAll();
    }

    /**
     * Retourne le type de période pour les cinq jours ouvrés d'une semaine ISO.
     * Une date comprise dans une période de vacances confirmée est EXTRASCOLAIRE,
     * sinon elle est PERISCOLAIRE.
     */
    public function typesForIsoWeek(int $year, int $week): array
    {
        $monday = (new DateTimeImmutable())->setISODate($year, $week, 1)->setTime(0, 0);
        $friday = $monday->modify('+4 days');
        $periods = $this->periodsBetween($monday->format('Y-m-d'), $friday->format('Y-m-d'));
        $days = [];

        for ($offset = 0; $offset < 5; $offset++) {
            $date = $monday->modify('+' . $offset . ' days')->format('Y-m-d');
            $matchingPeriod = null;
            foreach ($periods as $period) {
                if ($date >= $period['date_debut'] && $date <= $period['date_fin']) {
                    $matchingPeriod = $period;
                    break;
                }
            }

            $days[] = [
                'date' => $date,
                'type_affectation' => $matchingPeriod ? 'EXTRASCOLAIRE' : 'PERISCOLAIRE',
                'vacances' => $matchingPeriod ? [
                    'id_periode' => (int) $matchingPeriod['id_periode'],
                    'libelle' => (string) $matchingPeriod['libelle'],
                    'annee_scolaire' => (string) $matchingPeriod['annee_scolaire'],
                ] : null,
            ];
        }

        return $days;
    }
}