<?php


class QuaggaPlugin extends Plugin
{

    const REM_PREFIX = "! routes from file ";

    public function restart(): string
    {
        $configfile = $this->config["file"];

        if (!file_exists($configfile)) {
            throw new RuntimeException("Quagga config file not found");
        }

        $networks = (new NetworkConfigReader())->getConfigs();
        $routeParser = new RoutingTableReader();
        $routes = $routeParser->getRoutes();
        $defGatewayInterface = "";
        $defGateway = "";

        foreach ($routes as $route) {
            if ($route["dst"] === "0.0.0.0/0") {
                $defGatewayInterface = $route["dev"];
                $defGateway = $route["gateway"];
                break;
            }
        }

        if (!$defGatewayInterface) {
            throw new RuntimeException("Failed to detect default gateway interface");
        }

        $contents = file_get_contents($configfile);
        $lines = explode("\n", $contents);

        //remove existing routes
        foreach ($lines as $key => $line) {
            if (str_starts_with($line, self::REM_PREFIX) or str_starts_with($line, "ip route ") and str_contains($line . " ", $defGateway . " ")) {
                unset($lines[$key]);
            }
        }


        //add new routes
        foreach ($this->context->getConfig()["networks"] as $key) {
            $lines[] = self::REM_PREFIX . $key;
            if (isset($networks[$key])) {
                foreach ($networks[$key]["networks"] as $route) {
                    $lines[] = "ip route " . $route . " " . $defGateway;
                }
            }
        }

        foreach ($lines as $key => $line) {
            if (trim($line) === "") {
                unset($lines[$key]);
            }
        }


        $backupFile = $configfile . ".sav";

        unlink($backupFile);
        rename($configfile, $backupFile);
        file_put_contents($configfile, implode("\n", $lines));

        sleep(10);

        //restart zebra
        return shell_exec($this->config["restart_cmd"]);
    }

    public function onServerStarted()
    {
        $this->restart();
    }

    public function onSync($remote_config)
    {
        $this->restart();
    }
}