<?php
class GoPage {
    private $page;
    private $socket;
    private $template;
    
    public function __construct($page, $socket = "/home/simponic/fruitvote/http.sock", $start_cmd="/home/simponic/fruitvote/start.sh", $template = "../template.html") {
        $this->page = $page;
        $this->socket = $socket;
        $this->template = $template;

        // test if socket exists
        if (!file_exists($socket)) {
            // start the server
            exec($start_cmd);
        }

        for ($i = 0; $i < 10; $i++) {
            if (file_exists($socket)) {
                break;
            }
            usleep(100_000); // wait 100ms
        }

        if (!file_exists($socket)) {
            throw new Exception("Could not start server");
        }
    }
    public function go() {
        $ch = curl_init();
        $url = "http://localhost".$this->page;

        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_UNIX_SOCKET_PATH, $this->socket);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        // forward headers
        $headers = array();
        foreach ($_SERVER as $key => $value) {
            if (substr($key, 0, 5) == "HTTP_") {
                $key = str_replace(" ", "-", ucwords(strtolower(str_replace("_", " ", substr($key, 5)))));
                $headers[] = "$key: $value";
            }
        }
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

        // forward params depending on http method
        if ($_SERVER['REQUEST_METHOD'] == "POST" || $_SERVER['REQUEST_METHOD'] == "PUT" || $_SERVER['REQUEST_METHOD'] == "DELETE") {
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, file_get_contents('php://input'));
        } else {
            $url .= "?".$_SERVER['QUERY_STRING'];
        }

        // forward cookies
        $cookie = array();
        foreach ($_COOKIE as $key => $value) {
            $cookie[] = "$key=$value";
        }

        $output = curl_exec($ch);
        curl_close($ch);

        // forward headers back to client
        $headers = explode("\n", $output);
        foreach ($headers as $header) {
            if (strpos($header, "HTTP/") === false) {
                header($header);
            }
        }

        // forward cookies back to client
        $cookie = explode("\n", $output);
        foreach ($cookie as $cookie) {
            if (strpos($cookie, "Set-Cookie:") !== false) {
                header($cookie);
            }
        }
        
        return $output;
    }

    public function render() {
        $response = $this->go();
        $template = file_get_contents($this->template);
        return str_replace("{{content}}", $response, $template);
    }
}