core/BaseController.php

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<?php
require_once __DIR__ . '/../config/database.php';
require_once __DIR__ . '/Database.php';

class BaseController {
    protected $db;
    
    public function __construct() {
        $this->db = Database::getInstance();
    }
    
    protected function render($view, $data = []) {
        extract($data);
        $viewFile = __DIR__ . '/../views/' . $view . '.php';
        if (!file_exists($viewFile)) {
            throw new Exception("View file not found: {$view}");
        }
        require_once $viewFile;
    }
    
    protected function renderAdmin($view, $data = []) {
        extract($data);
        $viewFile = __DIR__ . '/../admin/views/' . $view . '.php';
        if (!file_exists($viewFile)) {
            throw new Exception("Admin view file not found: {$view}");
        }
        require_once $viewFile;
    }
    
    protected function redirect($url) {
        header("Location: {$url}");
        exit;
    }
    
    protected function json($data) {
        header('Content-Type: application/json; charset=utf-8');
        echo json_encode($data, JSON_UNESCAPED_UNICODE);
        exit;
    }
    
    protected function getPost($key = null, $default = null) {
        if ($key === null) {
            return $_POST;
        }
        return $_POST[$key] ?? $default;
    }
    
    protected function getQuery($key = null, $default = null) {
        if ($key === null) {
            return $_GET;
        }
        return $_GET[$key] ?? $default;
    }
    
    protected function isPost() {
        return $_SERVER['REQUEST_METHOD'] === 'POST';
    }
    
    protected function isAjax() {
        return isset($_SERVER['HTTP_X_REQUESTED_WITH']) &&