<?php

require_once __DIR__ . '/../models/Event.php';

class EventController
{
    private function requireAuth(): void
    {
        if (!isset($_SESSION['logged_in']) || !$_SESSION['logged_in']) {
            header('Location: /logowanie');
            exit;
        }
    }

    public function index(): void
    {
        $this->requireAuth();

        $userId = $_SESSION['user_id'];
        $userLogin = $_SESSION['user_login'];

        // Pobierz rok i miesiąc z parametrów lub użyj bieżących
        $year = isset($_GET['rok']) ? (int) $_GET['rok'] : (int) date('Y');
        $month = isset($_GET['miesiac']) ? (int) $_GET['miesiac'] : (int) date('m');

        // Walidacja
        if ($month < 1) {
            $month = 12;
            $year--;
        } elseif ($month > 12) {
            $month = 1;
            $year++;
        }

        $events = Event::getByMonth($userId, $year, $month);

        // Grupowanie wydarzeń po dacie
        $eventsByDate = [];
        foreach ($events as $event) {
            $eventsByDate[$event['event_date']][] = $event;
        }

        $success = $_SESSION['success'] ?? null;
        $error = $_SESSION['error'] ?? null;
        unset($_SESSION['success'], $_SESSION['error']);

        require __DIR__ . '/../views/calendar/index.php';
    }

    public function dayEvents(string $date): void
    {
        $this->requireAuth();

        $userId = $_SESSION['user_id'];
        $userLogin = $_SESSION['user_login'];

        // Walidacja daty
        if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $date)) {
            $_SESSION['error'] = 'Nieprawidłowy format daty.';
            header('Location: /kalendarz');
            exit;
        }

        $events = Event::getByDate($userId, $date);

        $success = $_SESSION['success'] ?? null;
        $error = $_SESSION['error'] ?? null;
        unset($_SESSION['success'], $_SESSION['error']);

        require __DIR__ . '/../views/calendar/day.php';
    }

    public function create(string $date = null): void
    {
        $this->requireAuth();

        $userLogin = $_SESSION['user_login'];
        $event = null;
        $isEdit = false;
        $selectedDate = $date ?? date('Y-m-d');

        require __DIR__ . '/../views/calendar/form.php';
    }

    public function store(): void
    {
        $this->requireAuth();

        $userId = $_SESSION['user_id'];
        $title = trim($_POST['title'] ?? '');
        $content = trim($_POST['content'] ?? '');
        $eventDate = $_POST['event_date'] ?? '';

        if (empty($title)) {
            $_SESSION['error'] = 'Tytuł wydarzenia jest wymagany.';
            header('Location: /kalendarz/nowe');
            exit;
        }

        if (empty($eventDate)) {
            $_SESSION['error'] = 'Data wydarzenia jest wymagana.';
            header('Location: /kalendarz/nowe');
            exit;
        }

        Event::create($userId, $title, $content, $eventDate);
        $_SESSION['success'] = 'Wydarzenie zostało dodane.';
        header('Location: /kalendarz/dzien/' . $eventDate);
        exit;
    }

    public function edit(int $id): void
    {
        $this->requireAuth();

        $userId = $_SESSION['user_id'];
        $userLogin = $_SESSION['user_login'];
        $event = Event::getById($id, $userId);

        if (!$event) {
            $_SESSION['error'] = 'Wydarzenie nie zostało znalezione.';
            header('Location: /kalendarz');
            exit;
        }

        $isEdit = true;
        $selectedDate = $event['event_date'];

        require __DIR__ . '/../views/calendar/form.php';
    }

    public function update(int $id): void
    {
        $this->requireAuth();

        $userId = $_SESSION['user_id'];
        $title = trim($_POST['title'] ?? '');
        $content = trim($_POST['content'] ?? '');
        $eventDate = $_POST['event_date'] ?? '';

        if (empty($title)) {
            $_SESSION['error'] = 'Tytuł wydarzenia jest wymagany.';
            header("Location: /kalendarz/edytuj/$id");
            exit;
        }

        $event = Event::getById($id, $userId);
        if (!$event) {
            $_SESSION['error'] = 'Wydarzenie nie zostało znalezione.';
            header('Location: /kalendarz');
            exit;
        }

        Event::update($id, $userId, $title, $content, $eventDate);
        $_SESSION['success'] = 'Wydarzenie zostało zaktualizowane.';
        header('Location: /kalendarz/dzien/' . $eventDate);
        exit;
    }

    public function delete(int $id): void
    {
        $this->requireAuth();

        $userId = $_SESSION['user_id'];
        $event = Event::getById($id, $userId);

        if (!$event) {
            $_SESSION['error'] = 'Wydarzenie nie zostało znalezione.';
            header('Location: /kalendarz');
            exit;
        }

        $eventDate = $event['event_date'];
        Event::delete($id, $userId);
        $_SESSION['success'] = 'Wydarzenie zostało usunięte.';
        header('Location: /kalendarz/dzien/' . $eventDate);
        exit;
    }
}