using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using Microsoft.Extensions.Logging;
using StabilityMatrix.Avalonia.Languages;
using StabilityMatrix.Avalonia.ViewModels.Base;
using StabilityMatrix.Core.Helper;
using StabilityMatrix.Core.Helper.Factory;
using StabilityMatrix.Core.Models;
using StabilityMatrix.Core.Models.Packages;
using StabilityMatrix.Core.Models.Progress;
using StabilityMatrix.Core.Python;
using StabilityMatrix.Core.Services;

namespace StabilityMatrix.Avalonia.ViewModels.Dialogs;

public partial class OneClickInstallViewModel : ViewModelBase
{
    private readonly ISettingsManager settingsManager;
    private readonly IPackageFactory packageFactory;
    private readonly IPrerequisiteHelper prerequisiteHelper;
    private readonly ILogger<OneClickInstallViewModel> logger;
    private readonly IPyRunner pyRunner;
    private readonly ISharedFolders sharedFolders;
    private const string DefaultPackageName = "stable-diffusion-webui";

    [ObservableProperty]
    private string headerText;

    [ObservableProperty]
    private string subHeaderText;

    [ObservableProperty]
    private string subSubHeaderText = string.Empty;

    [ObservableProperty]
    private bool showInstallButton;

    [ObservableProperty]
    private bool isIndeterminate;

    [ObservableProperty]
    private ObservableCollection<BasePackage> allPackages;

    [ObservableProperty]
    private BasePackage selectedPackage;

    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(IsProgressBarVisible))]
    private int oneClickInstallProgress;

    public bool IsProgressBarVisible => OneClickInstallProgress > 0 || IsIndeterminate;

    public OneClickInstallViewModel(
        ISettingsManager settingsManager,
        IPackageFactory packageFactory,
        IPrerequisiteHelper prerequisiteHelper,
        ILogger<OneClickInstallViewModel> logger,
        IPyRunner pyRunner,
        ISharedFolders sharedFolders
    )
    {
        this.settingsManager = settingsManager;
        this.packageFactory = packageFactory;
        this.prerequisiteHelper = prerequisiteHelper;
        this.logger = logger;
        this.pyRunner = pyRunner;
        this.sharedFolders = sharedFolders;

        HeaderText = Resources.Text_WelcomeToStabilityMatrix;
        SubHeaderText = Resources.Text_OneClickInstaller_SubHeader;
        ShowInstallButton = true;
        AllPackages = new ObservableCollection<BasePackage>(
            this.packageFactory.GetAllAvailablePackages().Where(p => p.OfferInOneClickInstaller)
        );
        SelectedPackage = AllPackages[0];
    }

    [RelayCommand]
    private async Task Install()
    {
        ShowInstallButton = false;
        await DoInstall();
        ShowInstallButton = true;
    }

    [RelayCommand]
    private Task ToggleAdvancedMode()
    {
        EventManager.Instance.OnOneClickInstallFinished(true);
        return Task.CompletedTask;
    }

    private async Task DoInstall()
    {
        HeaderText = $"{Resources.Label_Installing} {SelectedPackage.DisplayName}";

        var progressHandler = new Progress<ProgressReport>(progress =>
        {
            SubHeaderText = $"{progress.Title} {progress.Percentage:N0}%";

            IsIndeterminate = progress.IsIndeterminate;
            OneClickInstallProgress = Convert.ToInt32(progress.Percentage);
        });

        await prerequisiteHelper.InstallAllIfNecessary(progressHandler);

        SubHeaderText = Resources.Progress_InstallingPrerequisites;
        IsIndeterminate = true;
        if (!PyRunner.PipInstalled)
        {
            await pyRunner.SetupPip();
        }

        if (!PyRunner.VenvInstalled)
        {
            await pyRunner.InstallPackage("virtualenv");
        }
        IsIndeterminate = false;

        var libraryDir = settingsManager.LibraryDir;

        // get latest version & download & install
        var installLocation = Path.Combine(libraryDir, "Packages", SelectedPackage.Name);

        var downloadVersion = new DownloadPackageVersionOptions();
        var installedVersion = new InstalledPackageVersion();

        var versionOptions = await SelectedPackage.GetAllVersionOptions();
        if (versionOptions.AvailableVersions != null && versionOptions.AvailableVersions.Any())
        {
            downloadVersion.VersionTag = versionOptions.AvailableVersions.First().TagName;
            installedVersion.InstalledReleaseVersion = downloadVersion.VersionTag;
        }
        else
        {
            downloadVersion.BranchName = await SelectedPackage.GetLatestVersion();
            installedVersion.InstalledBranch = downloadVersion.BranchName;
        }

        var torchVersion = SelectedPackage.GetRecommendedTorchVersion();

        await DownloadPackage(installLocation, downloadVersion);
        await InstallPackage(installLocation, torchVersion);

        var recommendedSharedFolderMethod = SelectedPackage.RecommendedSharedFolderMethod;
        await SelectedPackage.SetupModelFolders(installLocation, recommendedSharedFolderMethod);

        var installedPackage = new InstalledPackage
        {
            DisplayName = SelectedPackage.DisplayName,
            LibraryPath = Path.Combine("Packages", SelectedPackage.Name),
            Id = Guid.NewGuid(),
            PackageName = SelectedPackage.Name,
            Version = installedVersion,
            LaunchCommand = SelectedPackage.LaunchCommand,
            LastUpdateCheck = DateTimeOffset.Now,
            PreferredTorchVersion = torchVersion,
            PreferredSharedFolderMethod = recommendedSharedFolderMethod
        };
        await using var st = settingsManager.BeginTransaction();
        st.Settings.InstalledPackages.Add(installedPackage);
        st.Settings.ActiveInstalledPackageId = installedPackage.Id;
        EventManager.Instance.OnInstalledPackagesChanged();

        HeaderText = Resources.Progress_InstallationComplete;
        SubSubHeaderText = string.Empty;
        OneClickInstallProgress = 100;

        for (var i = 0; i < 3; i++)
        {
            SubHeaderText = $"{Resources.Text_ProceedingToLaunchPage} ({i + 1}s)";
            await Task.Delay(1000);
        }

        // should close dialog
        EventManager.Instance.OnOneClickInstallFinished(false);
    }

    private async Task DownloadPackage(
        string installLocation,
        DownloadPackageVersionOptions versionOptions
    )
    {
        SubHeaderText = Resources.Progress_DownloadingPackage;

        var progress = new Progress<ProgressReport>(progress =>
        {
            IsIndeterminate = progress.IsIndeterminate;
            OneClickInstallProgress = Convert.ToInt32(progress.Percentage);
            EventManager.Instance.OnGlobalProgressChanged(OneClickInstallProgress);
        });

        await SelectedPackage.DownloadPackage(installLocation, versionOptions, progress);
        SubHeaderText = Resources.Progress_DownloadComplete;
        OneClickInstallProgress = 100;
    }

    private async Task InstallPackage(string installLocation, TorchVersion torchVersion)
    {
        var progress = new Progress<ProgressReport>(progress =>
        {
            SubHeaderText = Resources.Progress_InstallingPackageRequirements;
            IsIndeterminate = progress.IsIndeterminate;
            OneClickInstallProgress = Convert.ToInt32(progress.Percentage);
            EventManager.Instance.OnGlobalProgressChanged(OneClickInstallProgress);
        });

        await SelectedPackage.InstallPackage(
            installLocation,
            torchVersion,
            progress,
            (output) => SubSubHeaderText = output.Text
        );
    }
}