package io.gitlab.jfronny.glaunch.windows;

import imgui.ImGui;
import imgui.flag.ImGuiTableFlags;
import imgui.flag.ImGuiWindowFlags;
import imgui.type.ImBoolean;
import io.gitlab.jfronny.glaunch.GLaunch;
import io.gitlab.jfronny.glaunch.model.InstanceMeta;
import io.gitlab.jfronny.glaunch.model.MinecraftArgument;
import io.gitlab.jfronny.glaunch.model.VersionInfo;
import io.gitlab.jfronny.glaunch.model.VersionsListInfo;
import io.gitlab.jfronny.glaunch.util.Utils;
import io.gitlab.jfronny.glaunch.util.VersionInfoLibraryResolver;
import io.gitlab.jfronny.glaunch.util.mojang.McApi;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;

public class MainWindow extends Window {
    private final ImBoolean darkTheme = new ImBoolean(GLaunch.CONFIG.darkTheme);
    private final ImBoolean debugTools = new ImBoolean(false);
    private final List<InstanceMeta> instances; //TODO custom ordering
    public MainWindow() {
        super("GLaunch");
        List<InstanceMeta> instances = new ArrayList<>();
        try {
            for (Path path : Files.list(GLaunch.INSTANCE_DIR).filter(Files::isDirectory).toList()) {
                if (Files.exists(path.resolve("instance.json"))) {
                    InstanceMeta im = Utils.loadObject(path.resolve("instance.json"), InstanceMeta.class);
                    im.instancePath = path;
                    instances.add(im);
                } else {
                    GLaunch.LOGGER.error("Invalid instance (doesn't contain instance.json): " + path);
                }
            }
        } catch (IOException e) {
            GLaunch.LOGGER.error("Could not list present instances", e);
        }
        this.instances = List.copyOf(instances);
    }

    @Override
    public int getFlags() {
        return ImGuiWindowFlags.MenuBar | ImGuiWindowFlags.AlwaysAutoResize;
    }

    @Override
    public void draw() {
        ImGui.beginMenuBar();
        if (ImGui.beginMenu("File")) {
            if (ImGui.menuItem("New Instance")) GLaunch.open(new NewInstanceWindow());
            if (ImGui.menuItem("Exit GLaunch2")) GLaunch.exit();
            ImGui.endMenu();
        }
        if (ImGui.beginMenu("Settings")) {
            if (ImGui.checkbox("Dark Theme", darkTheme)) {
                GLaunch.CONFIG.darkTheme = darkTheme.get();
                GLaunch.saveConfig();
                GLaunch.applyTheme();
            }
            ImGui.endMenu();
        }
        if (ImGui.beginMenu("Help")) {
            if (ImGui.menuItem("About")) GLaunch.open(new AboutWindow());
            if (ImGui.menuItem("Log")) GLaunch.open(new LogWindow());
            ImGui.checkbox("Debug Tools", debugTools);
            ImGui.endMenu();
        }
        ImGui.endMenuBar();

        if (debugTools.get()) {
            ImGui.showDemoWindow();
        }

        if (instances.isEmpty()) {
            ImGui.text("You have not yet created an instance");
            ImGui.text("Use File->New Instance to do so");
        }
        else {
            if (ImGui.beginTable("Instances", 2, ImGuiTableFlags.Resizable | ImGuiTableFlags.Borders)) {
                for (InstanceMeta instance : instances) {
                    ImGui.tableNextColumn();
                    if (ImGui.button(instance.instancePath.getFileName().toString())) {
                        //TODO implement fabric support
                        //TODO extract launch logic to separate class
                        for (VersionsListInfo version : McApi.getVersions().versions) {
                            if (version.id.equals(instance.version)) {
                                try {
                                    List<String> args = new ArrayList<>();
                                    args.add("/lib/jvm/java-17-openjdk/bin/java"); //TODO allow selecting vm, detect with System.getProperty("java.home")
                                    VersionInfo info = McApi.getVersionInfo(version);
                                    StringBuilder classPath = new StringBuilder();
                                    for (VersionInfo.Library.Downloads.Artifact artifact : VersionInfoLibraryResolver.getRelevant(info)) {
                                        classPath.append(GLaunch.LIBRARIES_DIR.resolve(artifact.path).toAbsolutePath());
                                        classPath.append(':');
                                    }
                                    classPath.append(GLaunch.LIBRARIES_DIR.resolve("net/minecraft/minecraft").resolve(version.id + ".jar").toAbsolutePath());
                                    GLaunch.LOGGER.info(classPath.toString());
                                    //TODO -Xms{lowMem} -Xmx{maxMem}
                                    args.addAll(parse(info.arguments.jvm, info, instance, classPath.toString()));
                                    args.add(info.mainClass);
                                    args.addAll(parse(info.arguments.game, info, instance, classPath.toString()));
                                    //Process p = Runtime.getRuntime().exec(args.toArray(new String[0]), new String[0], instance.instancePath.toFile());
                                    ProcessBuilder pb = new ProcessBuilder(args.toArray(new String[0]));
                                    pb.directory(instance.instancePath.toFile());
                                    pb.redirectOutput(ProcessBuilder.Redirect.INHERIT);
                                    pb.redirectError(ProcessBuilder.Redirect.INHERIT);
                                    pb.start();
                                } catch (IOException e) {
                                    e.printStackTrace();
                                }
                            }
                        }
                    }
                    ImGui.tableNextColumn();
                    if (ImGui.button("Edit")) {
                        GLaunch.LOGGER.error("Editing not yet implemented"); //TODO allow changing name (moving), changing version, managing mods etc
                    }
                }
                ImGui.endTable();
            }
        }
    }

    private List<String> parse(List<MinecraftArgument> arguments, VersionInfo info, InstanceMeta instance, String classPath) {
        List<String> res = new ArrayList<>();
        for (MinecraftArgument argument : arguments) {
            for (String s : argument.arg()) {
                //TODO support old versions
                res.add(s
                        // game args
                        .replace("${auth_player_name}", "Joe") //TODO auth support
                        .replace("${version_name}", info.id) //TODO fabric support
                        .replace("${game_directory}", instance.instancePath.toAbsolutePath().toString())
                        .replace("${assets_root}", GLaunch.ASSETS_DIR.toAbsolutePath().toString())
                        .replace("${assets_index_name}", info.assets)
                        .replace("${auth_uuid}", "2536abce90e8476a871679918164abc5") //TODO auth support
                        .replace("${auth_access_token}", "99abe417230342cb8e9e2168ab46297a") //TODO auth support
                        .replace("${user_type}", "legacy") //TODO auth support
                        .replace("${version_type}", info.type)
                        .replace("${resolution_width}", "1920") //TODO has_custom_resolution
                        .replace("${resolution_height}", "1080") //TODO has_custom_resolution
                        // jvm args
                        .replace("${natives_directory}", GLaunch.INSTANCE_DIR.toAbsolutePath().toString())
                        .replace("${launcher_name}", "GLaunch")
                        .replace("${launcher_version}", "1.0") //TODO automatically fill in
                        .replace("${classpath}", classPath)
                );
            }
        }
        return res;
    }
}