using Avalonia;
using Avalonia.Threading;
using CommunityToolkit.Mvvm.ComponentModel;
using EventBus;
using Shaker.Models;
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;

namespace ShakerApp.ViewModels;

public abstract class ViewModelBase<TModel>:ViewModelBase where TModel:IModel
{
    public ViewModelBase(TModel model) : this()
    {
        UpDateModel(model);
    }
    private List<FieldInfo> AllFields = new List<FieldInfo>();
    private List<(string, IReadOnlyList<string>)> AllProperties = new List<(string, IReadOnlyList<string>)>();
    public ViewModelBase()
    {
        if (typeof(TModel).IsAnsiClass && !typeof(TModel).IsAbstract)
        {
            Model = Activator.CreateInstance<TModel>();
            AllFields = typeof(TModel).GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic).ToList();
            this.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
                .Where(x => x.GetCustomAttribute<ViewModels.PropertyAssociationAttribute>() != null)
                .ToList()
                .ForEach(x =>
                {
                    var att = x.GetCustomAttribute<PropertyAssociationAttribute>();
                    if (att == null || att.Names.Count == 0) return;
                    AllProperties.Add((x.Name, att.Names));
                });
        }
    }
    [AllowNull]
    private TModel model = default;

    public virtual TModel Model { get => model; set => SetProperty(ref model, value); }
    public virtual void ReceiveServiceModel(TModel model)
    {
        if (typeof(TModel).IsAbstract || typeof(TModel).IsInterface) return;
        if (lastModel != null)
        {
            lastModel = (TModel)model.Clone();
        }
        UpDateModel(model);
    }
    public virtual void UpDateModel(TModel model)
    {
        if (typeof(TModel).IsAbstract || typeof(TModel).IsInterface) return;
        List<string> changedNames = new List<string>();

        if (model == null || AllFields.Count == 0) return;
        if (Model == null)
        {
            changedNames = AllFields.Select(x => x.Name).ToList();
        }
        else
        {
            AllFields.ForEach(x =>
            {
                var lastvalue = x.GetValue(Model);
                var fieldvalue = x.GetValue(model);
                if (!Object.Equals(lastvalue, fieldvalue))
                {
                    changedNames.Add(x.Name);
                }
            });
        }
        Model = model;
        if (changedNames.Count == 0) return;
        List<string> nochanged = new List<string>();
        changedNames.ForEach(x =>
        {
            bool state = false;
            AllProperties.ForEach(y =>
            {
                if (y.Item2.Contains(x))
                {
                    OnPropertyChanged(y.Item1);
                    state = true;
                }
            });
            if (!state) nochanged.Add(x);
        });
        if (nochanged.Count == 0) return;
        RefreshUI(nochanged);
    }

    public virtual void Init()
    {
    }

    [AllowNull]
    private protected TModel lastModel;
    protected virtual void RefreshUI(List<string> changedNames)
    {

    }
}