using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reactive;
using System.Text.Json.Nodes;
using Avalonia.Media;
using ReactiveUI;

namespace VaultSmpInstaller.ViewModels;

public class ProfileWindow2ViewModel : ViewModelBase
{
    
    public Interaction<ProfileWindow2ViewModel, ProfileWindow2ViewModel.InstanceInfo?> ShowProfileSelectionDialog { get; }
    public ReactiveCommand<Unit, ProfileWindow2ViewModel.InstanceInfo?> SelectProfileCommand { get; }

    public static Brush Background => SolidColorBrush.Parse("#282A36");
    public static Brush SecondaryBackground => SolidColorBrush.Parse("#44475A");
    public static Brush ButtonBackground => SolidColorBrush.Parse("#6272A4");
    public static Brush TextColor => SolidColorBrush.Parse("#F8F8F2");

    public Dictionary<string, InstanceInfo> Instances { get; }
    public List<string> InstanceNames { get; }

    public InstanceInfo? SelectedInstance { get; set; } = null;

    public Boolean IsInstanceSelected => SelectedInstance != null;

    public ProfileWindow2ViewModel(InstanceType launcherType, string instancesDir)
    {
        Instances = new Dictionary<string, InstanceInfo>();
        switch (launcherType)
        {
            case InstanceType.Prism:
                foreach (var directory in Directory.EnumerateDirectories(instancesDir))
                {
                    if (!File.Exists(Path.Combine(directory, "instance.cfg"))) continue;
                    foreach(String line in File.ReadLines(Path.Combine(directory, "instance.cfg")))
                    {
                        if (line.StartsWith("name"))
                        {
                            Instances.Add(line.Split('=', 2)[1],
                                new InstanceInfo(
                                    line.Split('=', 2)[1],
                                    directory,
                                    Path.Combine(directory, "minecraft"),
                                    Path.Combine(directory, "minecraft", "mods"),
                                    Path.Combine(directory, "minecraft", "config"),
                                    Path.Combine(directory, "minecraft", "scripts")
                                    )
                                );
                            break;
                        }
                    }
                }
                break;
            case InstanceType.Curseforge: case InstanceType.Overwolf:
                foreach (var directory in Directory.EnumerateDirectories(instancesDir))
                {
                    if (!File.Exists(Path.Combine(directory, "minecraftinstance.json"))) continue;
    
                    var instanceConfig = JsonNode.Parse(File.ReadAllText(Path.Combine(directory, "minecraftinstance.json")))!.AsObject();
                    if (!instanceConfig.TryGetPropertyValue("name", out var nameNode)) continue;
                    if (!nameNode!.AsValue().TryGetValue(out string? instanceName)) continue;
                    
                    Instances.Add(instanceName,
                        new InstanceInfo(
                            instanceName,
                            directory,
                            directory,
                            Path.Combine(directory, "mods"),
                            Path.Combine(directory, "config"),
                            Path.Combine(directory, "scripts")
                        )
                    );
                }
                break;
            default:
                throw new ArgumentOutOfRangeException(nameof(launcherType), launcherType, null);
        }
        InstanceNames = Instances.Keys.ToList();
        
        SelectProfileCommand = ReactiveCommand.Create(() => SelectedInstance);
    }

    
    public enum InstanceType
    {
        Prism, Curseforge, Overwolf
    }

    public record InstanceInfo(String InstanceName, String InstancePath, String MinecraftPath, String ModsPath, String ConfigPath, String ScriptsPath);
}