Server/Server/src/main/java/uulm/teamname/marvelous/server/Server.java

package uulm.teamname.marvelous.server;

import com.beust.jcommander.JCommander;
import com.beust.jcommander.ParameterException;
import org.tinylog.Logger;
import org.tinylog.configuration.Configuration;
import uulm.teamname.marvelous.gamelibrary.config.CharacterConfig;
import uulm.teamname.marvelous.gamelibrary.config.PartyConfig;
import uulm.teamname.marvelous.gamelibrary.config.ScenarioConfig;
import uulm.teamname.marvelous.gamelibrary.json.JSON;
import uulm.teamname.marvelous.server.args.ServerArgs;
import uulm.teamname.marvelous.server.netconnector.MarvelousServer;

import java.io.*;
import java.net.InetSocketAddress;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;

/**
 * The MainClass of the Server application. The main responsibility of this class is to parse command line arguments,
 * set the log level, load the configuration files, and create and manage the threads that make up the server itself.
 * To run the server edit your IntelliJ run config, and enter
 * {@code -c .\configs\marvelheros.character.json -m .\configs\matchconfig_1.game.json
 * -s .\configs\asgard.scenario.json -v} into the arguments field.
 */
public class Server {

    public static void main(String[] args) {

        ServerArgs serverArgs = new ServerArgs();

        try {
            JCommander.newBuilder()
                    .addObject(serverArgs)
                    .build()
                    .parse(args);
        } catch (ParameterException e) {
            Logger.error("Invalid parameters: {}", e.getMessage());
            System.exit(1);
        }

        System.out.println(serverArgs);

        if (serverArgs.isVerbose() || serverArgs.isCheckConfig()) {
            // If checkConfig, the LogLevel is also set to max, because more information
            // is exactly what checking the requirements means
            setLogLevel(5);
        } else {
            setLogLevel(serverArgs.getLogLevel());
        }


        ScenarioConfig scenarioConfig = readScenarioConfig(serverArgs.getScenarioConfigFile());
        CharacterConfig characterConfig = readCharacterConfig(serverArgs.getCharacterConfigFile());
        PartyConfig partyConfig = readPartyConfig(serverArgs.getMatchConfigFile());

        // If only configurations should be checked, the server exits here
        if (serverArgs.isCheckConfig()) {
            Logger.info("Exiting as configuration file check is done");
            System.exit(0);
        }

        InetSocketAddress address = new InetSocketAddress(serverArgs.getPort());
        Logger.trace("Inet address {} created", address);

        var json = new JSON(characterConfig);
        Logger.trace("New JSON instance created with characterConfig");

        MarvelousServer netConnector = new MarvelousServer(address, json);
        System.out.println("Starting server");
        netConnector.start();
        System.out.println("Server started");


    }

    /** Function that sets the log level for {@link Logger Tinylog}.
     * It has to be executed <b>BEFORE ANY LOGGING OPERATIONS</b> .
     */
    private static void setLogLevel(int logLevel) {
        // System.out.println("setting log level to " + logLevel);
        Map<String, String> map = new HashMap<>();

        Configuration.replace(map);

        String logLevelDescriptor = switch (logLevel) {
            case 0  -> "off";
            case 1  -> "error";
            case 2  -> "warn";
            case 3  -> "info";
            case 4  -> "debug";
            case 5  -> "trace";
            default -> "info";
        };

        // Add log writer 1, a console writer (which logs to the console)
        map.put("writer1", "console");
        map.put("writer1.level", logLevelDescriptor);


        // Add log writer 2, a file writer logging to the file server.log
        map.put("writer2", "file");
        map.put("writer2.level", logLevelDescriptor);
        map.put("writer2.file", "./logs/server.log");

        Configuration.replace(map);

        Logger.info("Log level set to '" + logLevelDescriptor + "'");
    }

    private static ScenarioConfig readScenarioConfig(File source) {

        if (!source.exists()) {
            Logger.error("Scenario Configuration file not found. Exiting...");
            System.exit(1);
        }
        var config = JSON.parseScenarioConfig(source);
        if (config.isEmpty()) {
            Logger.error("Scenario Configuration couldn't be parsed. Exiting...");
            System.exit(1);
        }

        // TODO: Check whether Scenario Config is valid

        Logger.info("Scenario Config file loaded");

        return config.get();
    }


    private static CharacterConfig readCharacterConfig(File source) {

        if (!source.exists()) {
            Logger.error("Character Configuration file not found. Exiting...");
            System.exit(1);
        }
        var config = JSON.parseCharacterConfig(source);
        if (config.isEmpty()) {
            Logger.error("Character Configuration couldn't be parsed. Exiting...");
            System.exit(1);
        }


        // TODO: Check whether Character Config is valid

        Logger.info("Character Config file loaded");

        return config.get();
    }


    private static PartyConfig readPartyConfig(File source) {

        if (!source.exists()) {
            Logger.error("Party Configuration file not found. Exiting...");
            System.exit(1);
        }
        var config = JSON.parsePartyConfig(source);
        if (config.isEmpty()) {
            Logger.error("Party Configuration couldn't be parsed. Exiting...");
            System.exit(1);
        }

        // TODO: Check whether Party Config is valid

        Logger.info("Party Config file loaded");

        return config.get();
    }
}