<?php

namespace Libs;

/**
 * Request - DuckBrain
 *
 * Complementary library to the Router library.
 * Contains the basic body of the http request (POST, GET, JSON, etc).
 *
 * @author KJ
 * @website https://kj2.me
 * @license MIT
 */
class Request extends Neuron
{
    public Neuron $get;
    public Neuron $post;
    public Neuron $put;
    public Neuron $patch;
    public Neuron $delete;
    public Neuron $json;
    public Neuron $params;
    public string $path;
    public string $error;
    public string $body;

    /**
     * __construct
     */
    public function __construct()
    {
        $this->path   = Router::currentPath();
        $this->get    = new Neuron($_GET);
        $this->post   = new Neuron($_POST);
        $this->put    = new Neuron();
        $this->patch  = new Neuron();
        $this->delete = new Neuron();
        $this->params = Router::$params ?? new Neuron();
        $this->body   = file_get_contents("php://input");

        $contentType = isset($_SERVER["CONTENT_TYPE"]) ? trim($_SERVER["CONTENT_TYPE"]) : '';
        if ($contentType === "application/json") {
            $this->json = new Neuron(
                (object) json_decode(trim($this->body), false)
            );
        } else {
            $this->json   = new Neuron();
            if (
                in_array($_SERVER['REQUEST_METHOD'], ['PUT', 'PATCH', 'DELETE']) &&
                preg_match('/^[^;?\/:@&=+$,]{1,255}[=]/', $this->body, $matches)
            ) {
                // With the regular expression, we verify that it is a valid
                // http query string and avoid memory errors in case
                // the body contains something larger than that.
                parse_str($this->body, $input_vars);
                $this->{strtolower($_SERVER['REQUEST_METHOD'])} = new Neuron($input_vars);
            }
        }

        // Run configured validations
        if (!$this->validate()) {
            exit();
        }
    }

    /**
     * Starts the configured validation.
     *
     * @return bool
     */
    public function validate(): bool
    {
        $actual = match ($_SERVER['REQUEST_METHOD']) {
            'POST', 'PUT', 'PATCH', 'DELETE' => $this->{strtolower($_SERVER['REQUEST_METHOD'])},
            default => $this->get
        };

        if (
            Validator::validateList(static::paramRules(), $this->params) &&
            Validator::validateList(static::getRules(), $this->get) &&
            Validator::validateList(static::rules(), $actual)
        ) {
            return true;
        }

        if (isset(static::messages()[Validator::$lastFailed])) {
            $error =  static::messages()[Validator::$lastFailed];
        } else {
            $error = 'Error: validation failed of ' . preg_replace('/\./', ' as ', Validator::$lastFailed, 1);
        }

        static::onInvalid($error);
        return false;
    }

    /**
     * Rules for the current method.
     *
     * @return array
     */
    public function rules(): array
    {
        return [];
    }

    /**
     * Rules for URL parameters.
     *
     * @return array
     */
    public function paramRules(): array
    {
        return [];
    }

    /**
     * Rules for GET parameters.
     *
     * @return array
     */
    public function getRules(): array
    {
        return [];
    }

    /**
     * Error messages in case a validation fails.
     *
     * @return array
     */
    public function messages(): array
    {
        return [];
    }

    /**
     * Function to execute when an invalid value has been detected.
     *
     * @param string $error
     *
     * @return void
     */
    public function onInvalid(string $error): void
    {
        http_response_code(422);
        print($error);
    }
}