/*
 * Copyright (c) 2020 GeyserMC. http://geysermc.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @author GeyserMC
 * @link https://github.com/GeyserMC/Geyser
 */

package org.geysermc.platform.fabric;

import com.mojang.brigadier.builder.LiteralArgumentBuilder;
import lombok.Setter;
import net.fabricmc.api.EnvType;
import net.fabricmc.api.ModInitializer;
import net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents;
import net.fabricmc.loader.api.FabricLoader;
import net.minecraft.server.MinecraftServer;
import net.minecraft.server.command.ServerCommandSource;
import org.apache.logging.log4j.LogManager;
import org.geysermc.common.PlatformType;
import org.geysermc.connector.GeyserConnector;
import org.geysermc.connector.GeyserLogger;
import org.geysermc.connector.bootstrap.GeyserBootstrap;
import org.geysermc.connector.command.CommandManager;
import org.geysermc.connector.command.GeyserCommand;
import org.geysermc.connector.configuration.GeyserConfiguration;
import org.geysermc.connector.dump.BootstrapDumpInfo;
import org.geysermc.connector.ping.GeyserLegacyPingPassthrough;
import org.geysermc.connector.ping.IGeyserPingPassthrough;
import org.geysermc.connector.utils.FileUtils;
import org.geysermc.connector.utils.LanguageUtils;
import org.geysermc.platform.fabric.command.GeyserFabricCommandExecutor;
import org.geysermc.platform.fabric.command.GeyserFabricCommandManager;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Path;
import java.util.*;

public class GeyserFabricMod implements ModInitializer, GeyserBootstrap {

    private static GeyserFabricMod instance;

    @Setter
    private boolean reloading;

    private GeyserConnector connector;
    private Path dataFolder;
    private List<String> playerCommands;
    private MinecraftServer server;

    private GeyserFabricCommandManager geyserCommandManager;
    private GeyserFabricConfiguration geyserConfig;
    private GeyserFabricLogger geyserLogger;
    private IGeyserPingPassthrough geyserPingPassthrough;

    @Override
    public void onInitialize() {
        instance = this;

        this.onEnable();
        if (FabricLoader.getInstance().getEnvironmentType() == EnvType.SERVER) {
            // Set as an event so we can get the proper IP and port if needed
            ServerLifecycleEvents.SERVER_STARTED.register(this::startGeyser);
        }
    }

    @Override
    public void onEnable() {
        dataFolder = FabricLoader.getInstance().getConfigDir().resolve("Geyser-Fabric");
        if (!dataFolder.toFile().exists()) {
            //noinspection ResultOfMethodCallIgnored
            dataFolder.toFile().mkdir();
        }
        try {
            File configFile = FileUtils.fileOrCopiedFromResource(dataFolder.resolve("config.yml").toFile(), "config.yml",
                    (x) -> x.replaceAll("generateduuid", UUID.randomUUID().toString()));
            this.geyserConfig = FileUtils.loadConfig(configFile, GeyserFabricConfiguration.class);
            File permissionsFile = fileOrCopiedFromResource(dataFolder.resolve("permissions.yml").toFile(), "permissions.yml");
            this.playerCommands = Arrays.asList(FileUtils.loadConfig(permissionsFile, GeyserFabricPermissions.class).getCommands());
        } catch (IOException ex) {
            LogManager.getLogger("geyser-fabric").error(LanguageUtils.getLocaleStringLog("geyser.config.failed"), ex);
            ex.printStackTrace();
        }

        this.geyserLogger = new GeyserFabricLogger(geyserConfig.isDebugMode());

        GeyserConfiguration.checkGeyserConfiguration(geyserConfig, geyserLogger);

        if (server == null) {
            // Server has yet to start
            // Register onDisable so players are properly kicked
            ServerLifecycleEvents.SERVER_STOPPING.register((server) -> onDisable());
        } else {
            // Server has started and this is a reload
            startGeyser(this.server);
            reloading = false;
        }
    }

    /**
     * Initialize core Geyser.
     * A function, as it needs to be called in different places depending on if Geyser is being reloaded or not.
     *
     * @param server The minecraft server.
     */
    public void startGeyser(MinecraftServer server) {
        this.server = server;

        if (this.geyserConfig.getRemote().getAddress().equalsIgnoreCase("auto")) {
            this.geyserConfig.setAutoconfiguredRemote(true);
            String ip = server.getServerIp();
            int port = ((GeyserServerPortGetter) server).geyser$getServerPort();
            if (ip != null && !ip.isEmpty() && !ip.equals("0.0.0.0")) {
                this.geyserConfig.getRemote().setAddress(ip);
            }
            this.geyserConfig.getRemote().setPort(port);
        }

        if (geyserConfig.getBedrock().isCloneRemotePort()) {
            geyserConfig.getBedrock().setPort(geyserConfig.getRemote().getPort());
        }

        this.connector = GeyserConnector.start(PlatformType.FABRIC, this);

        this.geyserPingPassthrough = GeyserLegacyPingPassthrough.init(connector);

        this.geyserCommandManager = new GeyserFabricCommandManager(connector);

        // Start command building
        // Set just "geyser" as the help command
        LiteralArgumentBuilder<ServerCommandSource> builder = net.minecraft.server.command.CommandManager.literal("geyser")
                .executes(new GeyserFabricCommandExecutor(connector, connector.getCommandManager().getCommands().get("help"),
                        !playerCommands.contains("help")));
        for (Map.Entry<String, GeyserCommand> command : connector.getCommandManager().getCommands().entrySet()) {
            // Register all subcommands as valid
            builder.then(net.minecraft.server.command.CommandManager.literal(
                    command.getKey()).executes(new GeyserFabricCommandExecutor(connector, command.getValue(),
                    !playerCommands.contains(command.getKey()))));
        }
        server.getCommandManager().getDispatcher().register(builder);
    }

    @Override
    public void onDisable() {
        if (connector != null) {
            connector.shutdown();
            connector = null;
        }
        if (!reloading) {
            this.server = null;
        }
    }

    @Override
    public GeyserConfiguration getGeyserConfig() {
        return geyserConfig;
    }

    @Override
    public GeyserLogger getGeyserLogger() {
        return geyserLogger;
    }

    @Override
    public CommandManager getGeyserCommandManager() {
        return geyserCommandManager;
    }

    @Override
    public IGeyserPingPassthrough getGeyserPingPassthrough() {
        return geyserPingPassthrough;
    }

    @Override
    public Path getConfigFolder() {
        return dataFolder;
    }

    @Override
    public BootstrapDumpInfo getDumpInfo() {
        return new GeyserFabricDumpInfo(server);
    }

    private File fileOrCopiedFromResource(File file, String name) throws IOException {
        if (!file.exists()) {
            //noinspection ResultOfMethodCallIgnored
            file.createNewFile();
            FileOutputStream fos = new FileOutputStream(file);
            InputStream input = GeyserFabricMod.class.getResourceAsStream("/" + name); // resources need leading "/" prefix

            byte[] bytes = new byte[input.available()];

            //noinspection ResultOfMethodCallIgnored
            input.read(bytes);

            for(char c : new String(bytes).toCharArray()) {
                fos.write(c);
            }

            fos.flush();
            input.close();
            fos.close();
        }

        return file;
    }

    public static GeyserFabricMod getInstance() {
        return instance;
    }
}