<?php
namespace AdFuz\Requests;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class Request {
	private static ?self $instance = null;

	private array $get  = array();
	private array $post = array();

	public static function get_instance(): self {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

		return self::$instance;
	}

	public function __construct() {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$this->get = isset( $_GET ) && is_array( $_GET )
			? $this->normalize_deep( wp_unslash( $_GET ) )
			: array();

		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$this->post = isset( $_POST ) && is_array( $_POST )
			? $this->normalize_deep( wp_unslash( $_POST ) )
			: array();
	}

	private function normalize_deep( $value ) {
		if ( is_array( $value ) ) {
			return array_map( array( $this, 'normalize_deep' ), $value );
		}

		if ( is_string( $value ) ) {
			return sanitize_text_field( $value );
		}

		return $value;
	}

	private function source( string $type ): array {
		return match ( $type ) {
			'get' => $this->get,
			'post' => $this->post,
			default => $this->post,
		};
	}

	public function input( string $key, string $type = 'post', $default = null, ?callable $sanitizer = null ) {
		$data  = $this->source( $type );
		$value = $data[ $key ] ?? $default;

		if ( null !== $sanitizer ) {
			return call_user_func( $sanitizer, $value );
		}

		return $value;
	}

	public function all( string $type = 'post' ): array {
		return $this->source( $type );
	}

	public function only( array $keys, string $type = 'post' ): array {
		return array_intersect_key( $this->source( $type ), array_flip( $keys ) );
	}

	public function except( array $keys, string $type = 'post' ): array {
		return array_diff_key( $this->source( $type ), array_flip( $keys ) );
	}
}