<?php

namespace App\Core;

/**
 * NovaCore Request Handler
 * HTTP request wrapper
 */
class Request
{
    private array $data;

    public function __construct()
    {
        $this->data = array_merge($_GET, $_POST, $_REQUEST);
    }

    /**
     * Get all input data
     */
    public function all(): array
    {
        return $this->data;
    }

    /**
     * Get input value by key
     */
    public function input(string $key, $default = null)
    {
        return $this->data[$key] ?? $default;
    }

    /**
     * Get only specified keys
     */
    public function only(array $keys): array
    {
        return array_intersect_key($this->data, array_flip($keys));
    }

    /**
     * Get all except specified keys
     */
    public function except(array $keys): array
    {
        return array_diff_key($this->data, array_flip($keys));
    }

    /**
     * Check if key exists
     */
    public function has(string $key): bool
    {
        return isset($this->data[$key]);
    }

    /**
     * Get request method
     */
    public function method(): string
    {
        return $_SERVER['REQUEST_METHOD'] ?? 'GET';
    }

    /**
     * Check if method is POST
     */
    public function isPost(): bool
    {
        return $this->method() === 'POST';
    }

    /**
     * Check if method is GET
     */
    public function isGet(): bool
    {
        return $this->method() === 'GET';
    }

    /**
     * Get request URI
     */
    public function uri(): string
    {
        return $_SERVER['REQUEST_URI'] ?? '/';
    }

    /**
     * Get request path
     */
    public function path(): string
    {
        return parse_url($this->uri(), PHP_URL_PATH);
    }

    /**
     * Get query string
     */
    public function query(): string
    {
        return $_SERVER['QUERY_STRING'] ?? '';
    }

    /**
     * Get headers
     */
    public function headers(): array
    {
        if (function_exists('getallheaders')) {
            $h = getallheaders();
            return is_array($h) ? $h : [];
        }
        // Fallback build from $_SERVER
        $headers = [];
        foreach ($_SERVER as $key => $value) {
            if (strpos($key, 'HTTP_') === 0) {
                $name = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($key, 5)))));
                $headers[$name] = $value;
            } elseif (in_array($key, ['CONTENT_TYPE', 'CONTENT_LENGTH'])) {
                $name = str_replace('_', '-', ucwords(strtolower($key), '_'));
                $headers[$name] = $value;
            }
        }
        return $headers;
    }

    /**
     * Get specific header
     */
    public function header(string $name): ?string
    {
        $headers = $this->headers();
        return $headers[$name] ?? null;
    }

    /**
     * Check if request is AJAX
     */
    public function isAjax(): bool
    {
        return $this->header('X-Requested-With') === 'XMLHttpRequest';
    }

    /**
     * Check if request expects JSON
     */
    public function expectsJson(): bool
    {
        $accept = $this->header('Accept') ?? '';
        return stripos($accept, 'application/json') !== false;
    }

    /**
     * Get file upload
     */
    public function file(string $key): ?array
    {
        return $_FILES[$key] ?? null;
    }

    /**
     * Get all files
     */
    public function files(): array
    {
        return $_FILES;
    }

    /**
     * Get IP address
     */
    public function ip(): string
    {
        return $_SERVER['HTTP_X_FORWARDED_FOR'] ??
            $_SERVER['HTTP_X_REAL_IP'] ??
            $_SERVER['REMOTE_ADDR'] ??
            'unknown';
    }

    /**
     * Get user agent
     */
    public function userAgent(): string
    {
        return $_SERVER['HTTP_USER_AGENT'] ?? '';
    }

    /**
     * Get referer
     */
    public function referer(): ?string
    {
        return $_SERVER['HTTP_REFERER'] ?? null;
    }
}