<?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\AgentModel;
use App\Models\QuotaModel;
use App\Models\StructureModel;
use App\Services\AgentHoursContractPdfService;
use App\Services\AgentTimeSummaryPdfService;
use App\Services\PlanningPdfService;
use DateTimeImmutable;
use PDO;
use Throwable;

final class AgentController
{
    private AgentModel $agentModel;
    private StructureModel $structureModel;
    private QuotaModel $quotaModel;
    private Access $access;

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

    public function listForPlanning(): void
    {
        $this->access->requireDraftEditor();
        $selectedLocation = filter_input(INPUT_GET, 'structure_id', FILTER_VALIDATE_INT) ?: 0;
        if ($selectedLocation) {
            $this->access->requireStructureEdit((int) $selectedLocation);
        }
        JsonResponse::send(200, ['agents' => $this->agentModel->listForLocation((int) $selectedLocation)]);
    }

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

        if (!$agentId || $week === null) {
            JsonResponse::send(400, ['error' => 'Agent ou semaine invalide.']);
        }
        $this->access->requireAgentView((int) $agentId);

        $agent = $this->agentModel->findActive((int) $agentId);
        if ($agent === null) {
            JsonResponse::send(404, ['error' => 'Agent 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');

        JsonResponse::send(200, [
            'agent' => $agent,
            'week' => ['value' => $weekValue, 'date_debut' => $weekStart, 'date_fin' => $weekEnd],
            'quota' => $this->quotaModel->forDateForApi((int) $agentId, $weekStart),
            'entries' => $this->agentModel->entriesForWeek((int) $agentId, $year, $weekNumber),
        ]);
    }

    public function monthOverview(): void
    {
        $agentId = filter_input(INPUT_GET, 'agent_id', FILTER_VALIDATE_INT);
        $monthValue = trim((string) ($_GET['month'] ?? ''));

        if (!$agentId || !preg_match('/^(\d{4})-(\d{2})$/', $monthValue, $matches)) {
            JsonResponse::send(400, ['error' => 'Agent ou mois invalide.']);
        }
        $this->access->requireAgentView((int) $agentId);

        $year = (int) $matches[1];
        $monthNumber = (int) $matches[2];
        if ($monthNumber < 1 || $monthNumber > 12) {
            JsonResponse::send(400, ['error' => 'Mois invalide.']);
        }

        $agent = $this->agentModel->findActive((int) $agentId);
        if ($agent === null) {
            JsonResponse::send(404, ['error' => 'Agent introuvable.']);
        }

        $firstDay = new DateTimeImmutable(sprintf('%04d-%02d-01', $year, $monthNumber));
        $lastDay = $firstDay->modify('last day of this month');
        $gridStart = $firstDay->modify('-' . ((int) $firstDay->format('N') - 1) . ' days');
        $lastWeekMonday = $lastDay->modify('-' . ((int) $lastDay->format('N') - 1) . ' days');
        $gridEnd = $lastWeekMonday->modify('+4 days');

        $dayLabels = [1 => 'Lundi', 2 => 'Mardi', 3 => 'Mercredi', 4 => 'Jeudi', 5 => 'Vendredi'];
        $monthLabels = [
            1 => 'Janvier', 2 => 'Février', 3 => 'Mars', 4 => 'Avril', 5 => 'Mai', 6 => 'Juin',
            7 => 'Juillet', 8 => 'Août', 9 => 'Septembre', 10 => 'Octobre', 11 => 'Novembre', 12 => 'Décembre',
        ];
        $weeks = [];

        for ($monday = $gridStart; $monday <= $lastWeekMonday; $monday = $monday->modify('+7 days')) {
            $days = [];
            for ($weekday = 1; $weekday <= 5; $weekday++) {
                $date = $monday->modify('+' . ($weekday - 1) . ' days');
                $days[] = [
                    'date' => $date->format('Y-m-d'),
                    'label' => $dayLabels[$weekday],
                    'display' => $date->format('d/m'),
                    'in_month' => (int) $date->format('n') === $monthNumber,
                ];
            }
            $weeks[] = [
                'value' => sprintf('%04d-W%02d', (int) $monday->format('o'), (int) $monday->format('W')),
                'number' => (int) $monday->format('W'),
                'date_debut' => $monday->format('Y-m-d'),
                'date_fin' => $monday->modify('+4 days')->format('Y-m-d'),
                'days' => $days,
            ];
        }

        JsonResponse::send(200, [
            'agent' => $agent,
            'month' => [
                'value' => $monthValue,
                'year' => $year,
                'month' => $monthNumber,
                'label' => $monthLabels[$monthNumber] . ' ' . $year,
                'date_debut' => $firstDay->format('Y-m-d'),
                'date_fin' => $lastDay->format('Y-m-d'),
                'grid_start' => $gridStart->format('Y-m-d'),
                'grid_end' => $gridEnd->format('Y-m-d'),
            ],
            'weeks' => $weeks,
            'quota' => $this->quotaModel->forDateForApi((int) $agentId, $firstDay->format('Y-m-d')),
            'entries' => $this->agentModel->entriesForDateRange(
                (int) $agentId,
                $gridStart->format('Y-m-d'),
                $gridEnd->format('Y-m-d')
            ),
        ]);
    }

    public function timeSummaryPdf(): void
    {
        $agentId = filter_input(INPUT_GET, 'agent_id', FILTER_VALIDATE_INT);
        $dateValue = trim((string) ($_GET['date'] ?? ''));
        $year = filter_input(INPUT_GET, 'year', FILTER_VALIDATE_INT);

        if ($dateValue === '' && $year) {
            $dateValue = sprintf('%04d-01-01', (int) $year);
        }
        $date = DateTimeImmutable::createFromFormat('!Y-m-d', $dateValue);

        if (!$agentId || !$date || $date->format('Y-m-d') !== $dateValue) {
            http_response_code(400);
            echo 'Agent ou date de référence invalide.';
            return;
        }
        $this->access->requireAgentView((int) $agentId);

        $agent = $this->agentModel->findActive((int) $agentId);
        if ($agent === null) {
            http_response_code(404);
            echo 'Agent introuvable.';
            return;
        }

        $quota = $this->quotaModel->forDateForApi((int) $agentId, $dateValue);
        $summary = $this->agentModel->timeSummaryForRange(
            (int) $agentId,
            (string) $quota['date_debut_periode'],
            (string) $quota['date_fin_periode']
        );
        $pdf = (new AgentTimeSummaryPdfService())->annualSummary($agent, $quota, $summary);

        PdfResponse::inline(
            $pdf,
            sprintf(
                'bilan_heures_%s_%s_%s_%s.pdf',
                $agent['nom'],
                $agent['prenom'],
                str_replace('-', '', (string) $quota['date_debut_periode']),
                str_replace('-', '', (string) $quota['date_fin_periode'])
            )
        );
    }

    public function pdf(): void
    {
        $agentId = filter_input(INPUT_GET, 'agent_id', FILTER_VALIDATE_INT);
        $weekValue = trim((string) ($_GET['week'] ?? ''));
        $week = $this->parseWeek($weekValue);
        $weekCount = filter_input(INPUT_GET, 'weeks', FILTER_VALIDATE_INT) ?: 7;
        $weekCount = in_array((int) $weekCount, [6, 7], true) ? (int) $weekCount : 7;

        if (!$agentId || $week === null) {
            http_response_code(400);
            echo 'Agent ou semaine invalide.';
            return;
        }
        $this->access->requireAgentView((int) $agentId);

        $agent = $this->agentModel->findActive((int) $agentId);
        if ($agent === null) {
            http_response_code(404);
            echo 'Agent introuvable.';
            return;
        }

        [$year, $weekNumber] = $week;
        $firstMonday = (new DateTimeImmutable())->setISODate($year, $weekNumber, 1);
        $weeks = [];

        for ($index = 0; $index < $weekCount; $index++) {
            $monday = $firstMonday->modify('+' . ($index * 7) . ' days');
            $isoYear = (int) $monday->format('o');
            $isoWeek = (int) $monday->format('W');
            $weeks[] = [
                'value' => sprintf('%04d-W%02d', $isoYear, $isoWeek),
                'date_debut' => $monday->format('Y-m-d'),
                'date_fin' => $monday->modify('+6 days')->format('Y-m-d'),
            ];
        }

        $lastFriday = $firstMonday->modify('+' . (($weekCount - 1) * 7 + 4) . ' days');
        $entries = $this->agentModel->entriesForDateRange(
            (int) $agentId,
            $firstMonday->format('Y-m-d'),
            $lastFriday->format('Y-m-d')
        );

        $pdf = (new PlanningPdfService())->agentWeeks(
            $agent,
            $entries,
            $weeks,
            $this->quotaModel->forDateForApi((int) $agentId, $firstMonday->format('Y-m-d'))
        );

        PdfResponse::inline(
            $pdf,
            sprintf(
                'planning_%s_%s_%s_%d_semaines.pdf',
                $agent['nom'],
                $agent['prenom'],
                str_replace('-W', '_S', $weekValue),
                $weekCount
            )
        );
    }

    public function hoursContractPdf(): void
    {
        $agentId = filter_input(INPUT_GET, 'agent_id', FILTER_VALIDATE_INT);
        $dateValue = trim((string) ($_GET['date'] ?? ''));
        $year = filter_input(INPUT_GET, 'year', FILTER_VALIDATE_INT);

        if ($dateValue === '' && $year) {
            $dateValue = sprintf('%04d-01-01', (int) $year);
        }
        $date = DateTimeImmutable::createFromFormat('!Y-m-d', $dateValue);

        if (!$agentId || !$date || $date->format('Y-m-d') !== $dateValue) {
            http_response_code(400);
            echo 'Agent ou date de référence invalide.';
            return;
        }
        $this->access->requireAgentView((int) $agentId);

        $agent = $this->agentModel->findActive((int) $agentId);
        if ($agent === null) {
            http_response_code(404);
            echo 'Agent introuvable.';
            return;
        }

        $quota = $this->quotaModel->forDateForApi((int) $agentId, $dateValue);
        $pdf = (new AgentHoursContractPdfService())->annualContract($agent, $quota);

        PdfResponse::inline(
            $pdf,
            sprintf(
                'contrat_horaire_%s_%s_%s.pdf',
                $agent['nom'],
                $agent['prenom'],
                str_replace('-', '', (string) $quota['date_debut_periode'])
            )
        );
    }

    public function assignments(): void
    {
        $this->access->requireService();
        if (($_SERVER['REQUEST_METHOD'] ?? 'GET') === 'GET') {
            JsonResponse::send(200, ['agents' => $this->agentModel->allActive()]);
        }

        Request::requireMethod('POST');
        $payload = Request::json();
        Csrf::assertPayload($payload);

        $agentId = filter_var($payload['agent_id'] ?? null, FILTER_VALIDATE_INT);
        $rawStructure = $payload['structure_id'] ?? null;
        $structureId = ($rawStructure === null || $rawStructure === '' || $rawStructure === 0)
            ? null
            : filter_var($rawStructure, FILTER_VALIDATE_INT);
        if (!$agentId) {
            JsonResponse::send(422, ['error' => 'Agent invalide.']);
        }
        if ($this->agentModel->findActive((int) $agentId) === null) {
            JsonResponse::send(404, ['error' => 'Agent introuvable.']);
        }
        if ($structureId !== null && $this->structureModel->findActive((int) $structureId) === null) {
            JsonResponse::send(422, ['error' => 'Lieu d’affectation invalide ou inactif.']);
        }

        try {
            $this->agentModel->updateAssignment((int) $agentId, $structureId !== null ? (int) $structureId : null);
        } catch (Throwable $e) {
            JsonResponse::send(500, [
                'error' => 'Impossible de modifier les paramètres de l’agent.',
                'details' => (getenv('PTA_DEBUG') ?: '1') !== '0' ? $e->getMessage() : null,
            ]);
        }

        JsonResponse::send(200, [
            'message' => $structureId === null
                ? 'Les paramètres de l’agent ont été mis à jour sans lieu principal.'
                : 'Le lieu principal de l’agent a été mis à jour.',
        ]);
    }

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

        $matricule = trim((string) ($payload['matricule'] ?? ''));
        $nom = trim((string) ($payload['nom'] ?? ''));
        $prenom = trim((string) ($payload['prenom'] ?? ''));
        $email = trim((string) ($payload['email'] ?? ''));
        $telephone = trim((string) ($payload['telephone'] ?? ''));
        $adresse = trim((string) ($payload['adresse'] ?? ''));
        $estDiplome = filter_var($payload['est_diplome'] ?? false, FILTER_VALIDATE_BOOLEAN);
        $diplomeLibelle = trim((string) ($payload['diplome_libelle'] ?? ''));
        $structureId = filter_var($payload['structure_id'] ?? null, FILTER_VALIDATE_INT);
        $rate = filter_var($payload['quotite_travail'] ?? null, FILTER_VALIDATE_FLOAT);
        $contractStart = trim((string) ($payload['date_debut_contrat'] ?? ''));
        $contractStartDate = DateTimeImmutable::createFromFormat('!Y-m-d', $contractStart);
        $contractEnd = trim((string) ($payload['date_fin_contrat'] ?? ''));
        $contractEndDate = $contractEnd !== '' ? DateTimeImmutable::createFromFormat('!Y-m-d', $contractEnd) : null;
        $postId = filter_var($payload['id_poste'] ?? null, FILTER_VALIDATE_INT);
        $contractType = strtoupper(trim((string) ($payload['type_contrat'] ?? 'PERMANENT')));
        $trainingPlanned = filter_var($payload['formation_repartition_annuelle'] ?? false, FILTER_VALIDATE_BOOLEAN);
        $ptaComment = trim((string) ($payload['commentaire_pta'] ?? ''));
        $validPostIds = array_map(static fn(array $post): int => (int) $post['id_poste'], $this->agentModel->allPosts());

        if ($matricule === '' || $nom === '' || $prenom === '' || !$structureId || !$postId
            || !in_array((int) $postId, $validPostIds, true)
            || !in_array($contractType, ['PERMANENT', 'TEMPORAIRE'], true)
            || !$contractStartDate || $contractStartDate->format('Y-m-d') !== $contractStart
            || ($contractEnd !== '' && (!$contractEndDate || $contractEndDate->format('Y-m-d') !== $contractEnd || $contractEndDate < $contractStartDate))) {
            JsonResponse::send(422, ['error' => 'Le matricule, le nom, le prénom, le poste, le type de contrat, le lieu principal et des dates de contrat cohérentes sont obligatoires.']);
        }
        if ($rate === false || $rate <= 0 || $rate > 100) {
            JsonResponse::send(422, ['error' => 'La quotité de travail doit être comprise entre 1 et 100 %.']);
        }
        if ($email !== '' && filter_var($email, FILTER_VALIDATE_EMAIL) === false) {
            JsonResponse::send(422, ['error' => 'L’adresse e-mail saisie n’est pas valide.']);
        }
        if (strlen($matricule) > 50 || strlen($nom) > 100 || strlen($prenom) > 100 || strlen($email) > 255
            || strlen($telephone) > 30 || strlen($adresse) > 255 || strlen($diplomeLibelle) > 150 || strlen($ptaComment) > 1000) {
            JsonResponse::send(422, ['error' => 'Un des champs dépasse la longueur autorisée.']);
        }
        if ($this->structureModel->findActive((int) $structureId) === null) {
            JsonResponse::send(422, ['error' => 'Le lieu d’affectation principal sélectionné est invalide ou inactif.']);
        }
        if ($this->agentModel->matriculeExists($matricule)) {
            JsonResponse::send(409, ['error' => 'Un agent utilise déjà ce matricule.']);
        }

        try {
            $created = $this->agentModel->createWithDefaults([
                'matricule' => $matricule,
                'nom' => $nom,
                'prenom' => $prenom,
                'email' => $email !== '' ? $email : null,
                'telephone' => $telephone !== '' ? $telephone : null,
                'adresse' => $adresse !== '' ? $adresse : null,
                'est_diplome' => $estDiplome,
                'diplome_libelle' => $estDiplome && $diplomeLibelle !== '' ? $diplomeLibelle : null,
                'structure_id' => (int) $structureId,
                'quotite_travail' => (float) $rate,
                'date_debut_contrat' => $contractStart,
                'date_fin_contrat' => $contractEnd !== '' ? $contractEnd : null,
                'id_poste' => (int) $postId,
                'type_contrat' => $contractType,
                'formation_repartition_annuelle' => $trainingPlanned,
                'commentaire_pta' => $ptaComment !== '' ? $ptaComment : null,
            ]);
        } catch (Throwable $e) {
            JsonResponse::send(500, [
                'error' => 'Impossible de créer l’agent.',
                'details' => (getenv('PTA_DEBUG') ?: '1') !== '0' ? $e->getMessage() : null,
            ]);
        }

        $structure = $this->structureModel->findActive((int) $structureId);
        JsonResponse::send(201, [
            'message' => sprintf('%s %s a été ajouté avec le lieu principal « %s ».', $prenom, $nom, $structure['nom']),
            'agent' => array_merge($created, [
                'matricule' => $matricule,
                'nom' => $nom,
                'prenom' => $prenom,
                'email' => $email !== '' ? $email : null,
                'telephone' => $telephone !== '' ? $telephone : null,
                'adresse' => $adresse !== '' ? $adresse : null,
                'est_diplome' => $estDiplome ? 1 : 0,
                'diplome_libelle' => $estDiplome && $diplomeLibelle !== '' ? $diplomeLibelle : null,
                'id_structure' => (int) $structureId,
                'structure_nom' => (string) $structure['nom'],
                'structure_type_affectation' => (string) $structure['type_affectation'],
                'quotite_travail' => (float) $rate,
                'date_debut_contrat' => $contractStart,
                'date_fin_contrat' => $contractEnd !== '' ? $contractEnd : null,
                'id_poste' => (int) $postId,
                'poste_libelle' => (string) (array_values(array_filter($this->agentModel->allPosts(), static fn(array $post): bool => (int) $post['id_poste'] === (int) $postId))[0]['libelle'] ?? ''),
                'type_contrat' => $contractType,
                'formation_repartition_annuelle' => $trainingPlanned ? 1 : 0,
                'commentaire_pta' => $ptaComment !== '' ? $ptaComment : null,
            ]),
        ]);
    }

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

        $agentId = filter_var($payload['agent_id'] ?? null, FILTER_VALIDATE_INT);
        $email = trim((string) ($payload['email'] ?? ''));
        $telephone = trim((string) ($payload['telephone'] ?? ''));
        $adresse = trim((string) ($payload['adresse'] ?? ''));
        $estDiplome = filter_var($payload['est_diplome'] ?? false, FILTER_VALIDATE_BOOLEAN);
        $diplomeLibelle = trim((string) ($payload['diplome_libelle'] ?? ''));
        $contractStart = trim((string) ($payload['date_debut_contrat'] ?? ''));
        $contractStartDate = DateTimeImmutable::createFromFormat('!Y-m-d', $contractStart);
        $contractEnd = trim((string) ($payload['date_fin_contrat'] ?? ''));
        $contractEndDate = $contractEnd !== '' ? DateTimeImmutable::createFromFormat('!Y-m-d', $contractEnd) : null;
        $postId = filter_var($payload['id_poste'] ?? null, FILTER_VALIDATE_INT);
        $contractType = strtoupper(trim((string) ($payload['type_contrat'] ?? 'PERMANENT')));
        $trainingPlanned = filter_var($payload['formation_repartition_annuelle'] ?? false, FILTER_VALIDATE_BOOLEAN);
        $ptaComment = trim((string) ($payload['commentaire_pta'] ?? ''));
        $validPostIds = array_map(static fn(array $post): int => (int) $post['id_poste'], $this->agentModel->allPosts());
        $rawStructure = $payload['structure_id'] ?? null;
        $structureId = ($rawStructure === null || $rawStructure === '' || $rawStructure === 0)
            ? null
            : filter_var($rawStructure, FILTER_VALIDATE_INT);

        if (!$agentId) {
            JsonResponse::send(422, ['error' => 'Agent invalide.']);
        }
        if ($this->agentModel->findActive((int) $agentId) === null) {
            JsonResponse::send(404, ['error' => 'Agent introuvable.']);
        }
        if (!$postId || !in_array((int) $postId, $validPostIds, true)
            || !in_array($contractType, ['PERMANENT', 'TEMPORAIRE'], true)
            || !$contractStartDate || $contractStartDate->format('Y-m-d') !== $contractStart
            || ($contractEnd !== '' && (!$contractEndDate || $contractEndDate->format('Y-m-d') !== $contractEnd || $contractEndDate < $contractStartDate))) {
            JsonResponse::send(422, ['error' => 'Le poste, le type de contrat et les dates du contrat doivent être valides.']);
        }
        if ($email !== '' && filter_var($email, FILTER_VALIDATE_EMAIL) === false) {
            JsonResponse::send(422, ['error' => 'L’adresse e-mail saisie n’est pas valide.']);
        }
        if (strlen($email) > 255 || strlen($telephone) > 30 || strlen($adresse) > 255 || strlen($diplomeLibelle) > 150 || strlen($ptaComment) > 1000) {
            JsonResponse::send(422, ['error' => 'Un des champs dépasse la longueur autorisée.']);
        }
        if ($structureId !== null && $this->structureModel->findActive((int) $structureId) === null) {
            JsonResponse::send(422, ['error' => 'Lieu d’affectation principal invalide ou inactif.']);
        }

        try {
            $this->agentModel->updateProfile((int) $agentId, [
                'email' => $email !== '' ? $email : null,
                'telephone' => $telephone !== '' ? $telephone : null,
                'adresse' => $adresse !== '' ? $adresse : null,
                'est_diplome' => $estDiplome,
                'diplome_libelle' => $estDiplome && $diplomeLibelle !== '' ? $diplomeLibelle : null,
                'date_debut_contrat' => $contractStart,
                'date_fin_contrat' => $contractEnd !== '' ? $contractEnd : null,
                'id_poste' => (int) $postId,
                'type_contrat' => $contractType,
                'formation_repartition_annuelle' => $trainingPlanned,
                'commentaire_pta' => $ptaComment !== '' ? $ptaComment : null,
                'structure_id' => $structureId !== null ? (int) $structureId : null,
            ]);
        } catch (Throwable $e) {
            JsonResponse::send(500, [
                'error' => 'Impossible de modifier les informations de l’agent.',
                'details' => (getenv('PTA_DEBUG') ?: '1') !== '0' ? $e->getMessage() : null,
            ]);
        }

        JsonResponse::send(200, [
            'message' => 'Les informations de l’agent ont été mises à jour.',
            'agent' => $this->agentModel->findActive((int) $agentId),
        ]);
    }

    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;
    }
}