<?php

class WebRouter
{
    private string $requestBody;
    private string $requestedFile;
    private string $URI;

    public function __construct()
    {
        $this->requestBody = @file_get_contents('php://input');
        $this->requestedFile = dirname(__DIR__) . "/" . $_SERVER["REQUEST_URI"];
        $this->URI = $_SERVER["REQUEST_URI"];
    }

    public function handleRequest(): void
    {
        @session_start();
        try {
            if (str_starts_with($this->URI, "/assets") or str_starts_with($this->URI, "/plugins") and str_ends_with($this->URI, ".js")) {
                $this->handleAsset();
            } elseif (!str_starts_with($this->URI, "/rpc")) {
                $this->redirect("/assets/index.html");
            } else {
                $this->handleJRPC();
            }
        } finally {
            session_write_close();
        }
    }

    private function handleJRPC(): void
    {
        try {
            $request = @json_decode($this->requestBody, true);
            if ($request === null) {
                throw new RuntimeException("Failed to parse JRPC");
            }

            foreach (["id", "jsonrpc", "method", "params"] as $param) {
                if (!isset($request[$param])) {
                    throw new RuntimeException("Bad JRPC structure");
                }
            }

            $rpc = new RPC();
            $response = $rpc($request["method"], $request["params"]);

            header("content-type: application/json");

            echo json_encode([
                "jsonrpc" => "2.0",
                "id" => $request["id"] ?? 0,
                "result" => $response
            ]);

        } catch (Throwable $e) {
            http_response_code(500);
            echo json_encode([
                "jsonrpc" => "2.0",
                "id" => $request["id"],
                "error" => $e->getMessage()
            ]);
        }

    }

    private function handleAsset(): void
    {
        if (!file_exists($this->requestedFile)) {
            http_response_code(404);
            echo "File not found: " . $this->URI;
        } else {
            header("content-type: " . mime_content_type($this->requestedFile));
            echo file_get_contents($this->requestedFile);
        }

    }

    private function redirect($where): void
    {
        http_response_code(302);
        header("location: " . $where);
    }
}