<?php

require_once __DIR__ . '/Database.php';

class Event
{
    public static function ensureTable(): void
    {
        $db = Database::getInstance();
        $db->exec('
            CREATE TABLE IF NOT EXISTS events (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                user_id INTEGER NOT NULL,
                title VARCHAR(255) NOT NULL,
                content TEXT,
                event_date DATE NOT NULL,
                created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
                updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
                FOREIGN KEY (user_id) REFERENCES users(id)
            )
        ');
    }

    public static function getAllByUser(int $userId): array
    {
        self::ensureTable();
        $db = Database::getInstance();
        $stmt = $db->prepare('
            SELECT * FROM events
            WHERE user_id = :user_id
            ORDER BY event_date ASC
        ');
        $stmt->execute(['user_id' => $userId]);
        return $stmt->fetchAll();
    }

    public static function getByMonth(int $userId, int $year, int $month): array
    {
        self::ensureTable();
        $db = Database::getInstance();
        $startDate = sprintf('%04d-%02d-01', $year, $month);
        $endDate = sprintf('%04d-%02d-%02d', $year, $month, cal_days_in_month(CAL_GREGORIAN, $month, $year));

        $stmt = $db->prepare('
            SELECT * FROM events
            WHERE user_id = :user_id
            AND event_date BETWEEN :start_date AND :end_date
            ORDER BY event_date ASC
        ');
        $stmt->execute([
            'user_id' => $userId,
            'start_date' => $startDate,
            'end_date' => $endDate
        ]);
        return $stmt->fetchAll();
    }

    public static function getByDate(int $userId, string $date): array
    {
        self::ensureTable();
        $db = Database::getInstance();
        $stmt = $db->prepare('
            SELECT * FROM events
            WHERE user_id = :user_id AND event_date = :event_date
            ORDER BY created_at ASC
        ');
        $stmt->execute(['user_id' => $userId, 'event_date' => $date]);
        return $stmt->fetchAll();
    }

    public static function getById(int $id, int $userId): ?array
    {
        self::ensureTable();
        $db = Database::getInstance();
        $stmt = $db->prepare('
            SELECT * FROM events
            WHERE id = :id AND user_id = :user_id
        ');
        $stmt->execute(['id' => $id, 'user_id' => $userId]);
        $event = $stmt->fetch();
        return $event ?: null;
    }

    public static function create(int $userId, string $title, string $content, string $eventDate): int
    {
        self::ensureTable();
        $db = Database::getInstance();
        $stmt = $db->prepare('
            INSERT INTO events (user_id, title, content, event_date, created_at, updated_at)
            VALUES (:user_id, :title, :content, :event_date, datetime("now"), datetime("now"))
        ');
        $stmt->execute([
            'user_id' => $userId,
            'title' => $title,
            'content' => $content,
            'event_date' => $eventDate
        ]);
        return (int) $db->lastInsertId();
    }

    public static function update(int $id, int $userId, string $title, string $content, string $eventDate): bool
    {
        self::ensureTable();
        $db = Database::getInstance();
        $stmt = $db->prepare('
            UPDATE events
            SET title = :title, content = :content, event_date = :event_date, updated_at = datetime("now")
            WHERE id = :id AND user_id = :user_id
        ');
        return $stmt->execute([
            'id' => $id,
            'user_id' => $userId,
            'title' => $title,
            'content' => $content,
            'event_date' => $eventDate
        ]);
    }

    public static function delete(int $id, int $userId): bool
    {
        $db = Database::getInstance();
        $stmt = $db->prepare('
            DELETE FROM events
            WHERE id = :id AND user_id = :user_id
        ');
        return $stmt->execute(['id' => $id, 'user_id' => $userId]);
    }

    public static function countByUser(int $userId): int
    {
        self::ensureTable();
        $db = Database::getInstance();
        $stmt = $db->prepare('SELECT COUNT(*) as count FROM events WHERE user_id = :user_id');
        $stmt->execute(['user_id' => $userId]);
        return (int) $stmt->fetch()['count'];
    }

    public static function countThisWeek(int $userId): int
    {
        self::ensureTable();
        $db = Database::getInstance();

        // Poniedziałek tego tygodnia
        $monday = date('Y-m-d', strtotime('monday this week'));
        // Niedziela tego tygodnia
        $sunday = date('Y-m-d', strtotime('sunday this week'));

        $stmt = $db->prepare('
            SELECT COUNT(*) as count FROM events
            WHERE user_id = :user_id
            AND event_date BETWEEN :monday AND :sunday
        ');
        $stmt->execute([
            'user_id' => $userId,
            'monday' => $monday,
            'sunday' => $sunday
        ]);
        return (int) $stmt->fetch()['count'];
    }

    public static function getThisWeek(int $userId): array
    {
        self::ensureTable();
        $db = Database::getInstance();

        $monday = date('Y-m-d', strtotime('monday this week'));
        $sunday = date('Y-m-d', strtotime('sunday this week'));

        $stmt = $db->prepare('
            SELECT * FROM events
            WHERE user_id = :user_id
            AND event_date BETWEEN :monday AND :sunday
            ORDER BY event_date ASC
        ');
        $stmt->execute([
            'user_id' => $userId,
            'monday' => $monday,
            'sunday' => $sunday
        ]);
        return $stmt->fetchAll();
    }
}