<?php

declare(strict_types=1);

namespace App\Controllers;

use App\Core\Access;
use App\Core\Csrf;
use App\Core\JsonResponse;
use App\Core\PdfResponse;
use App\Core\Request;
use App\Models\CoverageModel;
use App\Models\QuotaModel;
use App\Models\StructureModel;
use App\Services\PlanningPdfService;
use DateTimeImmutable;
use PDO;
use Throwable;

final class StructureController
{
    private StructureModel $structureModel;
    private QuotaModel $quotaModel;
    private CoverageModel $coverageModel;
    private Access $access;

    public function __construct(private PDO $pdo)
    {
        $this->structureModel = new StructureModel($pdo);
        $this->quotaModel = new QuotaModel($pdo);
        $this->coverageModel = new CoverageModel($pdo);
        $this->access = new Access($pdo);
    }

    public function overview(): void
    {
        $structureId = filter_input(INPUT_GET, 'structure_id', FILTER_VALIDATE_INT);
        $weekValue = trim((string) ($_GET['week'] ?? ''));
        $week = $this->parseWeek($weekValue);

        if (!$structureId || $week === null) {
            JsonResponse::send(400, ['error' => 'Lieu d’affectation ou semaine invalide.']);
        }
        $this->access->requireStructureView((int) $structureId);

        $structure = $this->structureModel->findActive((int) $structureId);
        if ($structure === null) {
            JsonResponse::send(404, ['error' => 'Lieu d’affectation introuvable.']);
        }

        [$year, $weekNumber] = $week;
        $weekStart = (new DateTimeImmutable())->setISODate($year, $weekNumber, 1)->format('Y-m-d');
        $weekEnd = (new DateTimeImmutable())->setISODate($year, $weekNumber, 7)->format('Y-m-d');
        $entries = $this->structureModel->entriesForOverview((int) $structureId, $year, $weekNumber);
        $entriesByAgent = [];
        foreach ($entries as $entry) {
            $entriesByAgent[(int) $entry['id_agent']][] = $entry;
        }

        $agents = [];
        foreach ($this->structureModel->agentsForOverview((int) $structureId, $year, $weekNumber) as $agent) {
            $agentId = (int) $agent['id_agent'];
            $agents[] = [
                'id_agent' => $agentId,
                'matricule' => $agent['matricule'],
                'nom' => $agent['nom'],
                'prenom' => $agent['prenom'],
                'lieu_principal' => (int) ($agent['id_structure_principale'] ?? 0) === (int) $structureId,
                'quota' => $this->quotaModel->forDateForApi($agentId, $weekStart),
                'entries' => $entriesByAgent[$agentId] ?? [],
            ];
        }

        JsonResponse::send(200, [
            'structure' => $structure,
            'week' => ['value' => $weekValue, 'date_debut' => $weekStart, 'date_fin' => $weekEnd],
            'agents' => $agents,
            'coverage' => $this->coverageModel->reportForStructure((int) $structureId, $year, $weekNumber),
        ]);
    }

    public function pdf(): void
    {
        $structureId = filter_input(INPUT_GET, 'structure_id', FILTER_VALIDATE_INT);
        $weekValue = trim((string) ($_GET['week'] ?? ''));
        $week = $this->parseWeek($weekValue);

        if (!$structureId || $week === null) {
            http_response_code(400);
            echo 'Lieu d’affectation ou semaine invalide.';
            return;
        }
        $this->access->requireStructureView((int) $structureId);

        $structure = $this->structureModel->findActive((int) $structureId);
        if ($structure === null) {
            http_response_code(404);
            echo 'Lieu d’affectation introuvable.';
            return;
        }

        [$year, $weekNumber] = $week;
        $weekStart = (new DateTimeImmutable())->setISODate($year, $weekNumber, 1)->format('Y-m-d');
        $weekEnd = (new DateTimeImmutable())->setISODate($year, $weekNumber, 7)->format('Y-m-d');
        $weekData = ['value' => $weekValue, 'date_debut' => $weekStart, 'date_fin' => $weekEnd];

        $entries = $this->structureModel->entriesForOverview((int) $structureId, $year, $weekNumber);
        $entriesByAgent = [];
        foreach ($entries as $entry) {
            $entriesByAgent[(int) $entry['id_agent']][] = $entry;
        }

        $agents = [];
        foreach ($this->structureModel->agentsForOverview((int) $structureId, $year, $weekNumber) as $agent) {
            $agentId = (int) $agent['id_agent'];
            $agents[] = [
                'id_agent' => $agentId,
                'matricule' => $agent['matricule'],
                'nom' => $agent['nom'],
                'prenom' => $agent['prenom'],
                'lieu_principal' => (int) ($agent['id_structure_principale'] ?? 0) === (int) $structureId,
                'quota' => $this->quotaModel->forDateForApi($agentId, $weekStart),
                'entries' => $entriesByAgent[$agentId] ?? [],
            ];
        }

        $pdf = (new PlanningPdfService())->structureWeek($structure, $agents, $weekData);
        PdfResponse::inline(
            $pdf,
            sprintf('planning_lieu_%s_%s.pdf', $structure['code'] ?: $structure['id_structure'], str_replace('-W', '_S', $weekValue))
        );
    }

    public function create(): void
    {
        $this->access->requireService();
        Request::requireMethod('POST');
        $payload = Request::json();
        Csrf::assertPayload($payload);

        $rawCode = trim((string) ($payload['code'] ?? ''));
        $code = strtoupper((string) preg_replace('/\s+/', '_', $rawCode));
        $name = trim((string) ($payload['nom'] ?? ''));
        $address = trim((string) ($payload['adresse'] ?? ''));
        $typeAffectation = strtoupper(trim((string) ($payload['type_affectation'] ?? '')));

        if ($code === '' || $name === '') {
            JsonResponse::send(422, ['error' => 'Le code et le nom du lieu d’affectation sont obligatoires.']);
        }
        if (!in_array($typeAffectation, ['PERISCOLAIRE', 'EXTRASCOLAIRE'], true)) {
            JsonResponse::send(422, ['error' => 'Le type du lieu doit être Périscolaire ou Extrascolaire.']);
        }
        if (!preg_match('/^[A-Z0-9_-]{2,50}$/', $code)) {
            JsonResponse::send(422, ['error' => 'Le code doit contenir uniquement des lettres, chiffres, tirets ou underscores.']);
        }
        if (strlen($name) > 150 || strlen($address) > 255) {
            JsonResponse::send(422, ['error' => 'Un des champs dépasse la longueur autorisée.']);
        }
        if ($this->structureModel->codeExists($code)) {
            JsonResponse::send(409, ['error' => 'Un lieu d’affectation utilise déjà ce code.']);
        }

        try {
            $structure = $this->structureModel->create($code, $name, $address !== '' ? $address : null, $typeAffectation);
        } catch (Throwable $e) {
            JsonResponse::send(500, [
                'error' => 'Impossible de créer le lieu d’affectation.',
                'details' => (getenv('PTA_DEBUG') ?: '1') !== '0' ? $e->getMessage() : null,
            ]);
        }

        JsonResponse::send(201, [
            'message' => sprintf('Le lieu d’affectation « %s » a été ajouté.', $name),
            'structure' => $structure,
        ]);
    }

    public function updateType(): void
    {
        $this->access->requireService();
        Request::requireMethod('POST');
        $payload = Request::json();
        Csrf::assertPayload($payload);

        $structureId = filter_var($payload['structure_id'] ?? null, FILTER_VALIDATE_INT);
        $typeAffectation = strtoupper(trim((string) ($payload['type_affectation'] ?? '')));

        if (!$structureId) {
            JsonResponse::send(422, ['error' => 'Lieu d’affectation invalide.']);
        }
        if (!in_array($typeAffectation, ['PERISCOLAIRE', 'EXTRASCOLAIRE'], true)) {
            JsonResponse::send(422, ['error' => 'Le type du lieu doit être Périscolaire ou Extrascolaire.']);
        }
        $structure = $this->structureModel->findActive((int) $structureId);
        if ($structure === null) {
            JsonResponse::send(404, ['error' => 'Lieu d’affectation introuvable.']);
        }

        try {
            $this->structureModel->updateType((int) $structureId, $typeAffectation);
        } catch (Throwable $e) {
            JsonResponse::send(500, [
                'error' => 'Impossible de modifier le type du lieu d’affectation.',
                'details' => (getenv('PTA_DEBUG') ?: '1') !== '0' ? $e->getMessage() : null,
            ]);
        }

        JsonResponse::send(200, [
            'message' => sprintf('Le type du lieu « %s » a été mis à jour.', $structure['nom']),
            'structure' => [
                'id_structure' => (int) $structureId,
                'type_affectation' => $typeAffectation,
            ],
        ]);
    }

    private function parseWeek(string $value): ?array
    {
        if (!preg_match('/^(\d{4})-W(\d{2})$/', $value, $matches)) {
            return null;
        }
        $week = (int) $matches[2];
        return $week >= 1 && $week <= 53 ? [(int) $matches[1], $week] : null;
    }
}