using System;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text.Json.Nodes;
using CommunityToolkit.Mvvm.ComponentModel;
using StabilityMatrix.Avalonia.Controls;
using StabilityMatrix.Avalonia.Models;
using StabilityMatrix.Avalonia.Models.Inference;
using StabilityMatrix.Avalonia.Services;
using StabilityMatrix.Avalonia.ViewModels.Base;
using StabilityMatrix.Core.Attributes;
using StabilityMatrix.Core.Models;
using StabilityMatrix.Core.Models.Api.Comfy.Nodes;
using StabilityMatrix.Core.Models.Api.Comfy.NodeTypes;

namespace StabilityMatrix.Avalonia.ViewModels.Inference;

[View(typeof(ModelCard))]
[ManagedService]
[Transient]
public partial class ModelCardViewModel
    : LoadableViewModelBase,
        IParametersLoadableState,
        IComfyStep
{
    [ObservableProperty]
    private HybridModelFile? selectedModel;

    [ObservableProperty]
    private bool isRefinerSelectionEnabled;

    [ObservableProperty]
    private HybridModelFile? selectedRefiner = HybridModelFile.None;

    [ObservableProperty]
    private HybridModelFile? selectedVae = HybridModelFile.Default;

    [ObservableProperty]
    private bool isVaeSelectionEnabled;

    public string? SelectedModelName => SelectedModel?.RelativePath;

    public string? SelectedVaeName => SelectedVae?.RelativePath;

    public IInferenceClientManager ClientManager { get; }

    public ModelCardViewModel(IInferenceClientManager clientManager)
    {
        ClientManager = clientManager;
    }

    /// <inheritdoc />
    public void ApplyStep(ModuleApplyStepEventArgs e)
    {
        // Load base checkpoint
        var baseLoader = e.Nodes.AddTypedNode(
            new ComfyNodeBuilder.CheckpointLoaderSimple
            {
                Name = "CheckpointLoader",
                CkptName =
                    SelectedModel?.RelativePath
                    ?? throw new ValidationException("Model not selected")
            }
        );

        e.Builder.Connections.BaseModel = baseLoader.Output1;
        e.Builder.Connections.BaseClip = baseLoader.Output2;
        e.Builder.Connections.BaseVAE = baseLoader.Output3;

        // Load refiner
        if (IsRefinerSelectionEnabled && SelectedRefiner is { IsNone: false })
        {
            var refinerLoader = e.Nodes.AddTypedNode(
                new ComfyNodeBuilder.CheckpointLoaderSimple
                {
                    Name = "Refiner_CheckpointLoader",
                    CkptName =
                        SelectedRefiner?.RelativePath
                        ?? throw new ValidationException("Refiner Model enabled but not selected")
                }
            );

            e.Builder.Connections.RefinerModel = refinerLoader.Output1;
            e.Builder.Connections.RefinerClip = refinerLoader.Output2;
            e.Builder.Connections.RefinerVAE = refinerLoader.Output3;
        }

        // Load custom VAE
        if (IsVaeSelectionEnabled && SelectedVae is { IsNone: false, IsDefault: false })
        {
            var vaeLoader = e.Nodes.AddTypedNode(
                new ComfyNodeBuilder.VAELoader
                {
                    Name = "VAELoader",
                    VaeName =
                        SelectedVae?.RelativePath
                        ?? throw new ValidationException("VAE enabled but not selected")
                }
            );

            e.Builder.Connections.PrimaryVAE = vaeLoader.Output;
        }
    }

    /// <inheritdoc />
    public override JsonObject SaveStateToJsonObject()
    {
        return SerializeModel(
            new ModelCardModel
            {
                SelectedModelName = SelectedModelName,
                SelectedVaeName = SelectedVaeName,
                IsVaeSelectionEnabled = IsVaeSelectionEnabled
            }
        );
    }

    /// <inheritdoc />
    public override void LoadStateFromJsonObject(JsonObject state)
    {
        var model = DeserializeModel<ModelCardModel>(state);

        SelectedModel = model.SelectedModelName is null
            ? null
            : ClientManager.Models.FirstOrDefault(x => x.RelativePath == model.SelectedModelName);

        SelectedVae = model.SelectedVaeName is null
            ? HybridModelFile.Default
            : ClientManager.VaeModels.FirstOrDefault(x => x.RelativePath == model.SelectedVaeName);
    }

    /// <inheritdoc />
    public void LoadStateFromParameters(GenerationParameters parameters)
    {
        if (parameters.ModelName is not { } paramsModelName)
            return;

        var currentModels = ClientManager.Models;

        HybridModelFile? model;

        // First try hash match
        if (parameters.ModelHash is not null)
        {
            model = currentModels.FirstOrDefault(
                m =>
                    m.Local?.ConnectedModelInfo?.Hashes.SHA256 is { } sha256
                    && sha256.StartsWith(
                        parameters.ModelHash,
                        StringComparison.InvariantCultureIgnoreCase
                    )
            );
        }
        else
        {
            // Name matches
            model = currentModels.FirstOrDefault(m => m.RelativePath.EndsWith(paramsModelName));
            model ??= currentModels.FirstOrDefault(
                m => m.ShortDisplayName.StartsWith(paramsModelName)
            );
        }

        if (model is not null)
        {
            SelectedModel = model;
        }
    }

    /// <inheritdoc />
    public GenerationParameters SaveStateToParameters(GenerationParameters parameters)
    {
        return parameters with
        {
            ModelName = SelectedModel?.FileName,
            ModelHash = SelectedModel?.Local?.ConnectedModelInfo?.Hashes.SHA256
        };
    }

    internal class ModelCardModel
    {
        public string? SelectedModelName { get; init; }
        public string? SelectedVaeName { get; init; }
        public bool IsVaeSelectionEnabled { get; init; }
    }
}