package io.gitlab.jfronny.inceptum.windows;

import imgui.ImGui;
import imgui.type.ImBoolean;
import imgui.type.ImInt;
import imgui.type.ImString;
import io.gitlab.jfronny.inceptum.Inceptum;
import io.gitlab.jfronny.inceptum.install.SetupStepInfo;
import io.gitlab.jfronny.inceptum.model.inceptum.LoaderInfo;
import io.gitlab.jfronny.inceptum.model.fabric.FabricVersionLoaderInfo;
import io.gitlab.jfronny.inceptum.model.mojang.VersionInfo;
import io.gitlab.jfronny.inceptum.model.mojang.VersionsList;
import io.gitlab.jfronny.inceptum.model.mojang.VersionsListInfo;
import io.gitlab.jfronny.inceptum.util.api.FabricMetaApi;
import io.gitlab.jfronny.inceptum.util.api.McApi;
import io.gitlab.jfronny.inceptum.util.Utils;

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

public class NewInstanceWindow extends Window {
    public static final int MAX_NAME_LENGTH = 128;
    VersionsList manifest = McApi.getVersions();
    VersionsListInfo selected;
    Map<VersionsListInfo, List<FabricVersionLoaderInfo>> loaderInfoCache = new HashMap<>();
    FabricVersionLoaderInfo selectedFabric;
    ImInt version = new ImInt(0);
    ImString name = new ImString("", MAX_NAME_LENGTH);
    ImInt fabricVersion = new ImInt(0);
    ImBoolean snapshots = new ImBoolean(Inceptum.CONFIG.snapshots);
    ImBoolean fabric = new ImBoolean(true);
    public NewInstanceWindow() {
        super("New Instance");
        selected = getVersions(false).get(0);
        if (Inceptum.CONFIG.snapshots)
            version.set(manifest.versions.indexOf(selected));
        name.set(getDefaultName(selected, fabric.get()));
        List<FabricVersionLoaderInfo> versions = getFabricLoaderInfo();
        for (int i = 0, fabricLoaderInfoSize = versions.size(); i < fabricLoaderInfoSize; i++) {
            FabricVersionLoaderInfo version = versions.get(i);
            if (version.loader.stable) {
                selectedFabric = version;
                fabricVersion.set(i);
                break;
            }
        }
    }

    @Override
    public void draw() {
        if (ImGui.checkbox("Show snapshots", snapshots)) {
            boolean prev = Inceptum.CONFIG.snapshots;
            Inceptum.CONFIG.snapshots = snapshots.get();
            Inceptum.saveConfig();
            //fix version index
            int i = getVersions(Inceptum.CONFIG.snapshots).indexOf(getVersions(prev).get(version.get()));
            if (i == -1) version.set(0);
            else version.set(i);
        }
        List<VersionsListInfo> vil = getVersions(Inceptum.CONFIG.snapshots);
        if (ImGui.combo("Version", version, vil.stream().map(info -> info.id).toArray(String[]::new))) {
            VersionsListInfo prev = selected;
            selected = vil.get(version.get());
            if (getDefaultName(prev, fabric.get()).equals(name.get()))
                name.set(getDefaultName(selected, fabric.get())); //TODO "<ver> (1)" etc if exists
        }
        if (getFabricLoaderInfo().isEmpty()) {
            if (fabric.get() && getDefaultName(selected, true).equals(name.get()))
                name.set(getDefaultName(selected, false));
            fabric.set(false);
        } else {
            if (ImGui.checkbox("Fabric support", fabric)) {
                if (getDefaultName(selected, !fabric.get()).equals(name.get()))
                    name.set(getDefaultName(selected, fabric.get()));
            }
            if (fabric.get()) {
                ImGui.sameLine();
                List<FabricVersionLoaderInfo> versions = getFabricLoaderInfo();
                if (ImGui.combo("Loader", fabricVersion, versions.stream().map(info -> info.loader.version).toArray(String[]::new))) {
                    selectedFabric = versions.get(fabricVersion.get());
                }
            }
        }
        //TODO forge
        ImGui.inputTextWithHint("Name", "Select a name", name);
        if (!Utils.VALID_FILENAME.matcher(name.get()).matches())
            ImGui.text("Invalid name");
        else if (Files.exists(Inceptum.INSTANCE_DIR.resolve(name.get())))
            ImGui.text("Already exists");
        else if (ImGui.button("OK")) {
            close();
            try {
                VersionInfo vi = McApi.getVersionInfo(selected);
                if (fabric.get()) FabricMetaApi.addFabric(vi, selectedFabric.loader.version);
                Inceptum.open(new InstanceCreateProcessWindow(new SetupStepInfo(vi,
                        fabric.get() ? new LoaderInfo(selectedFabric.loader) : LoaderInfo.NONE,
                        name.get())));
            } catch (IOException e) {
                Inceptum.LOGGER.error("Could not initialize instance creation", e);
            }
        }
    }

    private List<VersionsListInfo> getVersions(boolean snapshots) {
        ArrayList<VersionsListInfo> res = new ArrayList<>(manifest.versions);
        res.removeIf(info -> !snapshots && !info.type.equals("release"));
        return res;
    }

    private List<FabricVersionLoaderInfo> getFabricLoaderInfo() {
        if (!loaderInfoCache.containsKey(selected))
            loaderInfoCache.put(selected, FabricMetaApi.getLoaderVersions(selected));
        return loaderInfoCache.get(selected);
    }

    private String getDefaultName(VersionsListInfo info, boolean fabric) {
        return fabric ? "Fabric " + info.id : info.id;
    }
}