<?php
/**
 * Contrôleur des statuts
 */

declare(strict_types=1);

class StatusController extends Controller
{
    /**
     * GET /statuses
     * ?project_id=X - statuts d'un projet spécifique
     * ?global=1 - uniquement les statuts globaux
     */
    public function index(): void
    {
        $this->requireAuth();

        $db = Database::getInstance();

        $where = ['user_id = :user_id'];
        $params = ['user_id' => $this->getUserId()];

        $projectId = $this->request->get('project_id');
        $globalOnly = $this->request->get('global');

        if ($projectId !== null) {
            // Statuts du projet + statuts globaux
            $where = ['user_id = :user_id AND (project_id = :project_id OR project_id IS NULL)'];
            $params['project_id'] = (int) $projectId;
        } elseif ($globalOnly !== null) {
            $where[] = 'project_id IS NULL';
        }

        $sql = '
            SELECT s.*,
                   (SELECT COUNT(*) FROM tasks t WHERE t.status_id = s.id) as task_count
            FROM statuses s
            WHERE ' . implode(' AND ', $where) . '
            ORDER BY s.position ASC, s.code ASC
        ';

        $stmt = $db->prepare($sql);
        $stmt->execute($params);
        $statuses = $stmt->fetchAll();

        Response::success($statuses);
    }

    /**
     * GET /statuses/{id}
     */
    public function show(): void
    {
        $this->requireAuth();

        $id = (int) $this->request->getParam('id');
        $status = $this->findOrFail($id);

        // Nombre de tâches avec ce statut
        $db = Database::getInstance();
        $stmt = $db->prepare('SELECT COUNT(*) as count FROM tasks WHERE status_id = :id');
        $stmt->execute(['id' => $id]);
        $status['task_count'] = (int) $stmt->fetch()['count'];

        Response::success($status);
    }

    /**
     * POST /statuses
     */
    public function store(): void
    {
        $this->requireAuth();

        $data = $this->validate([
            'code' => 'required|int',
            'name' => 'required|min:1|max:50',
            'color' => 'max:7',
            'project_id' => 'int',
            'position' => 'int',
        ]);

        // Si project_id fourni, vérifier qu'il appartient à l'utilisateur
        if (!empty($data['project_id'])) {
            $this->verifyProject((int) $data['project_id']);
        }

        $db = Database::getInstance();

        $stmt = $db->prepare('
            INSERT INTO statuses (user_id, project_id, code, name, color, position)
            VALUES (:user_id, :project_id, :code, :name, :color, :position)
        ');

        $stmt->execute([
            'user_id' => $this->getUserId(),
            'project_id' => $data['project_id'] ?: null,
            'code' => $data['code'],
            'name' => $data['name'],
            'color' => $data['color'] ?? '#6B7280',
            'position' => $data['position'] ?? $data['code'],
        ]);

        $statusId = (int) $db->lastInsertId();
        $status = $this->findOrFail($statusId);

        Response::success($status, 'Statut créé', 201);
    }

    /**
     * PUT /statuses/{id}
     */
    public function update(): void
    {
        $this->requireAuth();

        $id = (int) $this->request->getParam('id');
        $this->findOrFail($id);

        $data = $this->validate([
            'code' => 'int',
            'name' => 'min:1|max:50',
            'color' => 'max:7',
            'position' => 'int',
        ]);

        $db = Database::getInstance();

        $fields = [];
        $params = ['id' => $id];

        if (isset($data['code'])) {
            $fields[] = 'code = :code';
            $params['code'] = $data['code'];
        }

        if (isset($data['name'])) {
            $fields[] = 'name = :name';
            $params['name'] = $data['name'];
        }

        if (isset($data['color'])) {
            $fields[] = 'color = :color';
            $params['color'] = $data['color'];
        }

        if (isset($data['position'])) {
            $fields[] = 'position = :position';
            $params['position'] = $data['position'];
        }

        if (!empty($fields)) {
            $sql = 'UPDATE statuses SET ' . implode(', ', $fields) . ' WHERE id = :id';
            $stmt = $db->prepare($sql);
            $stmt->execute($params);
        }

        $status = $this->findOrFail($id);

        Response::success($status, 'Statut mis à jour');
    }

    /**
     * DELETE /statuses/{id}
     */
    public function destroy(): void
    {
        $this->requireAuth();

        $id = (int) $this->request->getParam('id');
        $status = $this->findOrFail($id);

        $db = Database::getInstance();

        // Vérifier qu'aucune tâche n'utilise ce statut
        $stmt = $db->prepare('SELECT COUNT(*) as count FROM tasks WHERE status_id = :id');
        $stmt->execute(['id' => $id]);
        $count = (int) $stmt->fetch()['count'];

        if ($count > 0) {
            Response::error("Impossible de supprimer : {$count} tâche(s) utilisent ce statut", 409);
        }

        $stmt = $db->prepare('DELETE FROM statuses WHERE id = :id');
        $stmt->execute(['id' => $id]);

        Response::success(null, 'Statut supprimé');
    }

    /**
     * Trouver un statut ou retourner 404
     */
    private function findOrFail(int $id): array
    {
        $db = Database::getInstance();

        $stmt = $db->prepare('
            SELECT * FROM statuses
            WHERE id = :id AND user_id = :user_id
        ');

        $stmt->execute([
            'id' => $id,
            'user_id' => $this->getUserId(),
        ]);

        $status = $stmt->fetch();

        if (!$status) {
            Response::notFound('Statut non trouvé');
        }

        return $status;
    }

    /**
     * Vérifier qu'un projet appartient à l'utilisateur
     */
    private function verifyProject(int $projectId): void
    {
        $db = Database::getInstance();

        $stmt = $db->prepare('SELECT id FROM projects WHERE id = :id AND user_id = :user_id');
        $stmt->execute(['id' => $projectId, 'user_id' => $this->getUserId()]);

        if (!$stmt->fetch()) {
            Response::error('Projet invalide', 422);
        }
    }
}