using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text.Json.Nodes;
using System.Text.Json.Serialization;
using System.Threading;
using System.Threading.Tasks;
using CommunityToolkit.Mvvm.ComponentModel;
using NLog;
using StabilityMatrix.Avalonia.Models;
using StabilityMatrix.Avalonia.Models.Inference;
using StabilityMatrix.Avalonia.Services;
using StabilityMatrix.Avalonia.ViewModels.Base;
using StabilityMatrix.Avalonia.ViewModels.Inference.Video;
using StabilityMatrix.Avalonia.Views.Inference;
using StabilityMatrix.Core.Attributes;
using StabilityMatrix.Core.Helper;
using StabilityMatrix.Core.Models;
using StabilityMatrix.Core.Models.Api.Comfy;
using StabilityMatrix.Core.Models.Api.Comfy.Nodes;
using StabilityMatrix.Core.Models.FileInterfaces;
using StabilityMatrix.Core.Services;

namespace StabilityMatrix.Avalonia.ViewModels.Inference;

[View(typeof(InferenceImageToVideoView), persistent: true)]
[ManagedService]
[Transient]
public partial class InferenceImageToVideoViewModel
    : InferenceGenerationViewModelBase,
        IParametersLoadableState
{
    private static readonly Logger Logger = LogManager.GetCurrentClassLogger();

    private readonly INotificationService notificationService;
    private readonly IModelIndexService modelIndexService;

    [JsonIgnore]
    public StackCardViewModel StackCardViewModel { get; }

    [JsonPropertyName("Model")]
    public ImgToVidModelCardViewModel ModelCardViewModel { get; }

    [JsonPropertyName("Sampler")]
    public SamplerCardViewModel SamplerCardViewModel { get; }

    [JsonPropertyName("BatchSize")]
    public BatchSizeCardViewModel BatchSizeCardViewModel { get; }

    [JsonPropertyName("Seed")]
    public SeedCardViewModel SeedCardViewModel { get; }

    [JsonPropertyName("ImageLoader")]
    public SelectImageCardViewModel SelectImageCardViewModel { get; }

    [JsonPropertyName("Conditioning")]
    public SvdImgToVidConditioningViewModel SvdImgToVidConditioningViewModel { get; }

    [JsonPropertyName("VideoOutput")]
    public VideoOutputSettingsCardViewModel VideoOutputSettingsCardViewModel { get; }

    public InferenceImageToVideoViewModel(
        INotificationService notificationService,
        IInferenceClientManager inferenceClientManager,
        ISettingsManager settingsManager,
        ServiceManager<ViewModelBase> vmFactory,
        IModelIndexService modelIndexService
    )
        : base(vmFactory, inferenceClientManager, notificationService, settingsManager)
    {
        this.notificationService = notificationService;
        this.modelIndexService = modelIndexService;

        // Get sub view models from service manager

        SeedCardViewModel = vmFactory.Get<SeedCardViewModel>();
        SeedCardViewModel.GenerateNewSeed();

        ModelCardViewModel = vmFactory.Get<ImgToVidModelCardViewModel>();

        SamplerCardViewModel = vmFactory.Get<SamplerCardViewModel>(samplerCard =>
        {
            samplerCard.IsDimensionsEnabled = true;
            samplerCard.IsCfgScaleEnabled = true;
            samplerCard.IsSamplerSelectionEnabled = true;
            samplerCard.IsSchedulerSelectionEnabled = true;
            samplerCard.CfgScale = 2.5d;
            samplerCard.SelectedSampler = ComfySampler.Euler;
            samplerCard.SelectedScheduler = ComfyScheduler.Karras;
            samplerCard.IsDenoiseStrengthEnabled = true;
            samplerCard.DenoiseStrength = 1.0f;
        });

        BatchSizeCardViewModel = vmFactory.Get<BatchSizeCardViewModel>();

        SelectImageCardViewModel = vmFactory.Get<SelectImageCardViewModel>();
        SvdImgToVidConditioningViewModel = vmFactory.Get<SvdImgToVidConditioningViewModel>();
        VideoOutputSettingsCardViewModel = vmFactory.Get<VideoOutputSettingsCardViewModel>();

        StackCardViewModel = vmFactory.Get<StackCardViewModel>();
        StackCardViewModel.AddCards(
            ModelCardViewModel,
            SvdImgToVidConditioningViewModel,
            SamplerCardViewModel,
            SeedCardViewModel,
            VideoOutputSettingsCardViewModel,
            BatchSizeCardViewModel
        );
    }

    /// <inheritdoc />
    protected override void BuildPrompt(BuildPromptEventArgs args)
    {
        base.BuildPrompt(args);

        var builder = args.Builder;

        builder.Connections.Seed = args.SeedOverride switch
        {
            { } seed => Convert.ToUInt64(seed),
            _ => Convert.ToUInt64(SeedCardViewModel.Seed)
        };

        // Load models
        ModelCardViewModel.ApplyStep(args);

        // Setup latent from image
        var imageLoad = builder.Nodes.AddTypedNode(
            new ComfyNodeBuilder.LoadImage
            {
                Name = builder.Nodes.GetUniqueName("ControlNet_LoadImage"),
                Image =
                    SelectImageCardViewModel.ImageSource?.GetHashGuidFileNameCached("Inference")
                    ?? throw new ValidationException()
            }
        );
        builder.Connections.Primary = imageLoad.Output1;
        builder.Connections.PrimarySize = SelectImageCardViewModel.CurrentBitmapSize;

        // Setup img2vid stuff
        // Set width & height from SamplerCard
        SvdImgToVidConditioningViewModel.Width = SamplerCardViewModel.Width;
        SvdImgToVidConditioningViewModel.Height = SamplerCardViewModel.Height;
        SvdImgToVidConditioningViewModel.ApplyStep(args);

        // Setup Sampler and Refiner if enabled
        SamplerCardViewModel.ApplyStep(args);

        // Animated webp output
        VideoOutputSettingsCardViewModel.ApplyStep(args);
    }

    /// <inheritdoc />
    protected override IEnumerable<ImageSource> GetInputImages()
    {
        if (SelectImageCardViewModel.ImageSource is { } image)
        {
            yield return image;
        }
    }

    /// <inheritdoc />
    protected override async Task GenerateImageImpl(
        GenerateOverrides overrides,
        CancellationToken cancellationToken
    )
    {
        if (!await CheckClientConnectedWithPrompt() || !ClientManager.IsConnected)
        {
            return;
        }

        if (!await ModelCardViewModel.ValidateModel())
            return;

        // If enabled, randomize the seed
        var seedCard = StackCardViewModel.GetCard<SeedCardViewModel>();
        if (overrides is not { UseCurrentSeed: true } && seedCard.IsRandomizeEnabled)
        {
            seedCard.GenerateNewSeed();
        }

        var batches = BatchSizeCardViewModel.BatchCount;

        var batchArgs = new List<ImageGenerationEventArgs>();

        for (var i = 0; i < batches; i++)
        {
            var seed = seedCard.Seed + i;

            var buildPromptArgs = new BuildPromptEventArgs { Overrides = overrides, SeedOverride = seed };
            BuildPrompt(buildPromptArgs);

            var generationArgs = new ImageGenerationEventArgs
            {
                Client = ClientManager.Client,
                Nodes = buildPromptArgs.Builder.ToNodeDictionary(),
                OutputNodeNames = buildPromptArgs.Builder.Connections.OutputNodeNames.ToArray(),
                Parameters = SaveStateToParameters(new GenerationParameters()),
                Project = InferenceProjectDocument.FromLoadable(this),
                FilesToTransfer = buildPromptArgs.FilesToTransfer,
                // Only clear output images on the first batch
                ClearOutputImages = i == 0
            };

            batchArgs.Add(generationArgs);
        }

        // Run batches
        foreach (var args in batchArgs)
        {
            await RunGeneration(args, cancellationToken);
        }
    }

    /// <inheritdoc />
    public void LoadStateFromParameters(GenerationParameters parameters)
    {
        SamplerCardViewModel.LoadStateFromParameters(parameters);
        ModelCardViewModel.LoadStateFromParameters(parameters);
        SvdImgToVidConditioningViewModel.LoadStateFromParameters(parameters);
        VideoOutputSettingsCardViewModel.LoadStateFromParameters(parameters);

        SeedCardViewModel.Seed = Convert.ToInt64(parameters.Seed);
    }

    /// <inheritdoc />
    public GenerationParameters SaveStateToParameters(GenerationParameters parameters)
    {
        parameters = SamplerCardViewModel.SaveStateToParameters(parameters);
        parameters = ModelCardViewModel.SaveStateToParameters(parameters);
        parameters = SvdImgToVidConditioningViewModel.SaveStateToParameters(parameters);
        parameters = VideoOutputSettingsCardViewModel.SaveStateToParameters(parameters);

        parameters.Seed = (ulong)SeedCardViewModel.Seed;

        return parameters;
    }

    // Migration for v2 deserialization
    public override void LoadStateFromJsonObject(JsonObject state, int version)
    {
        if (version > 2)
        {
            LoadStateFromJsonObject(state);
        }
    }
}