<?php

/** @param callable(_K_Api): void $apiFun */
function CreateApi(callable $apiFun)
{
    header("Access-Control-Allow-Origin: *");
    header("Access-Control-Allow-Headers: Content-Type");

    $api = new _K_Api();
    $apiFun($api);
    $api->end();
}
class _K_Api
{
    private $has_exec = false;
    /** @param callable(_K_ApiRequest): string|array|int|float|bool $fun */
    public function on(string $route, string $method, callable $fun)
    {
        $request_url = (count($_GET) > 0 ? array_keys($_GET)[0] : '');
        $r = str_starts_with($route, '/') ? substr($route, 1) : $route;
        if ($r != $request_url) {
            return;
        } else {
            $this->has_exec = true;
            if ($_SERVER['REQUEST_METHOD'] != $method) {
                http_response_code(405);
                die("ERROR: unsupported method ($method available)");
                return;
            }
            $data = [];
            if ($method == 'GET' && count($_GET) > 1) {
                $data = array_slice(array_keys($_GET), 1);
            } else if ($method == 'POST' && count($_POST) > 0) {
                $data = $_POST;
            }
            $fun = $fun(new _K_ApiRequest($data));
            if (is_string($fun) || is_numeric($fun)) {
                if (json_validate($fun) && !is_numeric($fun)) {
                    Header('Content-Type: application/json');
                }
                echo $fun;
            } else if (is_array($fun) || is_bool($fun)) {
                Header('Content-Type: application/json');
                echo json_encode($fun);
            } else {
                die("ERROR: unknown return type");
            }
        }
    }

    public function end()
    {
        if (!$this->has_exec) {
            http_response_code(404);
            echo '404';
        }
    }
}

class _K_ApiRequest
{
    public array $data;
    public _K_ApiResponse $res;

    public function __construct(array $data)
    {
        $this->data = $data;
        $this->res = new _K_ApiResponse($this);
    }
    public function hasData(array $dataArr)
    {
        foreach ($dataArr as $i) {
            if (!isset($this->data[$i])) {
                return false;
            }
        }
        return true;
    }
}

class _K_ApiResponse
{
    public function __construct($req) {}
    public function code(int $httpCode)
    {
        http_response_code($httpCode);
    }
}