package io.gitlab.jfronny.inceptum.util.api;

import io.gitlab.jfronny.inceptum.Inceptum;
import io.gitlab.jfronny.inceptum.model.mojang.*;
import io.gitlab.jfronny.inceptum.util.OSCheck;
import io.gitlab.jfronny.inceptum.util.Utils;

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

import static io.gitlab.jfronny.inceptum.util.Utils.downloadObject;

public class McApi {
    public static VersionsList getVersions() {
        try {
            return downloadObject("https://launchermeta.mojang.com/mc/game/version_manifest.json", VersionsList.class);
        } catch (IOException e) {
            throw new RuntimeException("Could not load version manifest", e);
        }
    }

    public static VersionInfo getVersionInfo(VersionsListInfo listInfo) throws IOException {
        return downloadObject(listInfo.url, VersionInfo.class);
    }

    public static AssetIndex getAssetIndex(VersionInfo info) throws IOException {
        Path file = Inceptum.ASSETS_DIR.resolve("indexes");
        if (!Files.exists(file)) Files.createDirectories(file);
        file = file.resolve(info.assetIndex.url.substring(info.assetIndex.url.lastIndexOf("/") + 1));
        try {
            Utils.downloadFile(info.assetIndex.url, info.assetIndex.sha1, file);
        }
        catch (IOException e) {
            if (!Files.exists(file)) throw e;
        }
        return Utils.loadObject(file, AssetIndex.class);
    }

    public static Map<String, JvmFileInfo.File> getJvm(String component, int majorVersion) throws IOException {
        // https://github.com/ATLauncher/ATLauncher/blob/master/src/main/java/com/atlauncher/constants/Constants.java#L116
        JvmInfo info = Utils.downloadObject("https://launchermeta.mojang.com/v1/products/java-runtime/2ec0cc96c44e5a76b9c8b7c39df7210883d12871/all.json", JvmInfo.class);
        JvmInfo.Jvms vms = switch (OSCheck.OS) {
            case WINDOWS -> info.windowsX64;
            case LINUX -> info.linux;
            case MAC_OS -> info.macOs;
        };
        List<JvmInfo.Jvms.Jvm> vmList = switch (component) {
            case "java-runtime-alpha" -> vms.javaRuntimeAlpha;
            case "jre-legacy" -> vms.jreLegacy;
            default -> throw new IOException("Invalid JVM component: " + component);
        };
        for (JvmInfo.Jvms.Jvm jvm : vmList) {
            if (jvm.version.name.startsWith(Integer.toString(majorVersion))) {
                return downloadObject(jvm.manifest.url, jvm.manifest.sha1, JvmFileInfo.class).files;
            }
        }
        throw new IOException("JVM not found");
    }

    public static void downloadAsset(AssetIndex.Asset asset, Path path) throws IOException {
        String url = "http://resources.download.minecraft.net/" + asset.hash.substring(0, 2) + "/" + asset.hash;
        Utils.downloadFile(url, asset.hash, path);
    }
}