using System.Net;

ServicePointManager.DefaultConnectionLimit = 512;

var javaList = ProjBobcat.Class.Helper.SystemInfoHelper.FindJava(); // Returns a list of all Java installations found in the registry.

var core = new DefaultGameCore
{
  ClientToken = clientToken,
  RootPath = rootPath,
  VersionLocator = new DefaultVersionLocator(rootPath, clientToken)
  {
    LauncherProfileParser = new DefaultLauncherProfileParser(rootPath, clientToken),
    LauncherAccountParser = new DefaultLauncherAccountParser(rootPath, clientToken)
  },
  GameLogResolver = new DefaultGameLogResolver()
};

List<VersionInfo> gameList = core.VersionLocator.GetAllGames().ToList();

//Here we use mcbbs' download source, change the uri to meet your need.
var drc = new DefaultResourceCompleter
{
    ResourceInfoResolvers = new List<IResourceInfoResolver>(2)
    {
        new AssetInfoResolver
        {
            AssetIndexUriRoot = "https://download.mcbbs.net/",
            AssetUriRoot = "https://download.mcbbs.net/assets/",
            BasePath = core.RootPath,
            VersionInfo = gameList[0]
        },
        new LibraryInfoResolver
        {
            BasePath = core.RootPath,
            LibraryUriRoot = "https://download.mcbbs.net/maven/",
            VersionInfo = gameList[0]
        }
    }
};

await drc.CheckAndDownloadTaskAsync().ConfigureAwait(false);

var launchSettings = new LaunchSettings
{
    FallBackGameArguments = new GameArguments // Default game arguments for all games in .minecraft/ as the fallback of specific game launch.
    {
        GcType = GcType.G1Gc, // GC type
        JavaExecutable = javaPath, //The path of Java executable
        Resolution = new ResolutionModel // Game Window's Resolution
        {
            Height = 600, // Height
            Width = 800 // Width
        },
        MinMemory = 512, // Minimal Memory
        MaxMemory = 1024 // Maximum Memory
    },
    Version = versionId, // The version ID of the game to launch, such as 1.7.10 or 1.15.2
    VersionInsulation = false // Version Isolation
    GameResourcePath = Core.RootPath, // Root path of the game resource(.minecraft/)
    GamePath = path, // Root path of the game (.minecraft/versions/)
    VersionLocator = Core.VersionLocator // Game's version locator
};

launchSettings.GameArguments = new GameArguments // (Optional) The arguments of specific game launch, the undefined settings here will be redirected to the fallback settings mentioned previously.
{
    AdvanceArguments = specificArguments , // Advanced launch arguments
    JavaExecutable = specificJavaExecutable, // JAVA's path
    Resolution = specificResolution, // The window's size
    MinMemory = specificMinMemory, // Minimum Memory
    MaxMemory = specificMaxMemory // Maximum Memory
};

launchSettings.Authenticator = new OfflineAuthenticator
{
    Username = "Username"
    LauncherAccountParser = core.VersionLocator.LauncherAccountParser // launcher_profiles.json parser
},

launchSettings.Authenticator = new YggdrasilAuthenticator
{
    LauncherAccountParser = core.VersionLocator.LauncherAccountParser
    Email = "example@example.com", // Registered E-mail address on Mojang authentication server.
    Password = "password"
};

var result = await Core.LaunchTaskAsync(launchSettings).ConfigureAwait(true); // Returns the launch result