using AyCode.Core;
using AyCode.Core.Enums;
using AyCode.Core.Helpers;
using AyCode.Core.Interfaces;
using AyCode.Core.Loggers;
using AyCode.Services.Server.SignalRs;
using AyCode.Services.SignalRs;
using AyCode.Utils.Extensions;
using DevExpress.Blazor;
using Microsoft.AspNetCore.Components;
using System.ComponentModel;
using System.Reflection;

namespace AyCode.Blazor.Components.Components.Grids;

public interface IMgGridBase : IGrid
{

}

public abstract class MgGridBase<TSignalRDataSource, TDataItem, TId, TLoggerClient> : DxGrid, IMgGridBase
    where TSignalRDataSource : AcSignalRDataSource<TDataItem, TId, AcObservableCollection<TDataItem>>
    where TDataItem : class, IId<TId>
    where TId : struct
    where TLoggerClient : AcLoggerBase
{
    private readonly EqualityComparer<TId> _equalityComparerId = EqualityComparer<TId>.Default;
    private readonly TypeConverter _typeConverterId = TypeDescriptor.GetConverter(typeof(TId));

    protected bool IsFirstInitializeParameters;
    protected bool IsFirstInitializeParameterCore;

    private TSignalRDataSource? _dataSource = null!;
    private AcObservableCollection<TDataItem>? _dataSourceParam = [];
    private string _gridLogName;

    public MgGridBase() : base()
    {
    }

    protected bool HasIdValue(TDataItem dataItem) => HasIdValue(dataItem.Id);
    protected bool HasIdValue(TId id) => !_equalityComparerId.Equals(id, default);
    protected bool IdEquals(TId id1, TId id2) => _equalityComparerId.Equals(id1, id2);

    [Parameter] public TLoggerClient Logger { get; set; }
    [Parameter] public string GridName { get; set; }
    [Parameter] public IId<TId>? ParentDataItem { get; set; }
    [Parameter] public string? KeyFieldNameToParentId { get; set; }
    [Parameter] public object[]? ContextIds { get; set; }

    public bool IsMasterGrid => ParentDataItem == null;
    protected PropertyInfo? KeyFieldPropertyInfoToParent;

    private string? _filterText = null;

    [Parameter]
    public string? FilterText
    {
        get => _filterText;
        set
        {
            _filterText = value;

            if (_dataSource != null && _dataSource.FilterText != value)
            {
                _dataSource.FilterText = value;
                ReloadDataSourceAsync().Forget();
            }
        }
    }

    [Parameter] public AcSignalRClientBase SignalRClient { get; set; }

    [Parameter] public int GetAllMessageTag { get; set; }
    [Parameter] public int GetItemMessageTag { get; set; }
    [Parameter] public int AddMessageTag { get; set; }
    [Parameter] public int UpdateMessageTag { get; set; }
    [Parameter] public int RemoveMessageTag { get; set; }

    protected new EventCallback<GridDataItemDeletingEventArgs> DataItemDeleting { get; set; }
    [Parameter] public EventCallback<GridDataItemDeletingEventArgs> OnGridItemDeleting { get; set; }

    protected new EventCallback<GridEditModelSavingEventArgs> EditModelSaving { get; set; }
    [Parameter] public EventCallback<GridEditModelSavingEventArgs> OnGridEditModelSaving { get; set; }

    protected new EventCallback<GridEditStartEventArgs> EditStart { get; set; }
    [Parameter] public EventCallback<GridEditStartEventArgs> OnGridEditStart { get; set; }

    protected new EventCallback<GridCustomizeEditModelEventArgs> CustomizeEditModel { get; set; }
    [Parameter] public EventCallback<GridCustomizeEditModelEventArgs> OnGridCustomizeEditModel { get; set; }

    [Parameter] public EventCallback<IList<TDataItem>> OnDataSourceChanged { get; set; }
    [Parameter] public EventCallback<GridDataItemChangingEventArgs<TDataItem>> OnGridItemChanging { get; set; }

    /// <summary>
    /// After the server has responded!
    /// </summary>
    [Parameter]
    public EventCallback<GridDataItemChangedEventArgs<TDataItem>> OnGridItemChanged { get; set; }

    [Parameter]
    [DefaultValue(null)]
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Usage", "BL0007:Component parameters should be auto properties", Justification = "<Pending>")]
    public IList<TDataItem> DataSource
    {
        get
        {
            if (_dataSource == null && Data != null)
            {
                Logger.Error($"{_gridLogName} Use the DataSource parameter instead of Data!");
                throw new NullReferenceException($"{_gridLogName} Use the DataSource parameter instead of Data!");
            }

            return _dataSource!;
        }
        set
        {
            _dataSourceParam = value as AcObservableCollection<TDataItem>;

            if (_dataSource != null) // && _dataSourceParam is List<TDataItem> workingReferenceList)
            {
                SetWorkingReferenceList(_dataSourceParam);
            }
        }
    }

    private void SetWorkingReferenceList(AcObservableCollection<TDataItem>? referenceList)
    {
        _dataSource?.SetWorkingReferenceList(referenceList);
        
        SetGridData(referenceList);
    }

    public void SetGridData(object? data)
    {
        if (ReferenceEquals(Data, data)) return;

        BeginUpdate();
        Data = data;
        EndUpdate();
    }

    protected override async Task OnInitializedAsync()
    {
        if (Logger == null)
            throw new NullReferenceException($"[{GetType().Name}] Logger == null");

        if (SignalRClient == null)
        {
            Logger.Error($"[{GetType().Name}] SignalRClient == null");
            throw new NullReferenceException($"[{GetType().Name}] SignalRClient == null");
        }

        var crudTags = new SignalRCrudTags(GetAllMessageTag, GetItemMessageTag, AddMessageTag, UpdateMessageTag, RemoveMessageTag);

        _dataSource = (TSignalRDataSource)Activator.CreateInstance(typeof(TSignalRDataSource), SignalRClient, crudTags, ContextIds)!;
        _dataSource.FilterText = FilterText;
        //_dataSource = new SignalRDataSource<TDataItem>(SignalRClient, crudTags, ContextIds) { FilterText = FilterText };

        SetGridData(_dataSource.GetReferenceInnerList());
        
        _dataSource.OnDataSourceLoaded += OnDataSourceLoaded;
        _dataSource.OnDataSourceItemChanged += OnDataSourceItemChanged;

        await base.OnInitializedAsync();
    }

    private async Task OnDataSourceItemChanged(ItemChangedEventArgs<TDataItem> args)
    {
        if (args.TrackingState is TrackingState.GetAll or TrackingState.None) return;

        Logger.Debug($"{_gridLogName} OnDataSourceItemChanged; trackingState: {args.TrackingState}");

        var changedEventArgs = new GridDataItemChangedEventArgs<TDataItem>(this, args.Item, args.TrackingState);
        await OnGridItemChanged.InvokeAsync(changedEventArgs);

        if (!changedEventArgs.CancelStateChangeInvoke)
        {
            //BeginUpdate();
            await InvokeAsync(StateHasChanged); //TODO: bezárja a DetailRow-t! pl: az email-nél IsReaded=true update... - J.
            //EndUpdate();
        }
    }

    private Task OnDataSourceLoaded()
    {
        Logger.Debug($"{_gridLogName} OnDataSourceLoaded; Count: {_dataSource?.Count}");

        //if(_dataSourceParam.GetType() == typeof()AcObservableCollection<TDataItem>)

        SetGridData(_dataSource!.GetReferenceInnerList());
        //else Reload();

        //_dataSource.LoadItem(_dataSource.First().Id).Forget();
        return OnDataSourceChanged.InvokeAsync(_dataSource);
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            if (_dataSource == null) return;

            if (_dataSourceParam != null) await _dataSource.LoadDataSource(_dataSourceParam, true, true);
            else _dataSource.LoadDataSourceAsync(true).Forget();
        }

        await base.OnAfterRenderAsync(firstRender);
    }

    private void SetNewId(TDataItem dataItem)
    {
        //TODO: int !!! - J.
        if (dataItem.Id is Guid)
        {
            dataItem.Id = (TId)(_typeConverterId.ConvertTo(Guid.NewGuid(), typeof(TId)))!;
        }
        else if (dataItem.Id is int)
        {
            var newId = -1 * AcDomain.NextUniqueInt32;
            dataItem.Id = (TId)(_typeConverterId.ConvertTo(newId, typeof(TId)))!;
        }
    }

    public Task AddDataItem(TDataItem dataItem)
    {
        if (!HasIdValue(dataItem)) SetNewId(dataItem);
        return _dataSource.Add(dataItem, true);
    }

    public Task AddDataItemAsync(TDataItem dataItem)
    {
        if (!HasIdValue(dataItem)) SetNewId(dataItem);
        _dataSource.Add(dataItem);

        return SaveChangesToServerAsync();
    }

    public Task InsertDataItem(int index, TDataItem dataItem)
    {
        if (!HasIdValue(dataItem)) SetNewId(dataItem);
        return _dataSource.Insert(index, dataItem, true);
    }

    public Task InsertDataItemAsync(int index, TDataItem dataItem)
    {
        if (!HasIdValue(dataItem)) SetNewId(dataItem);
        _dataSource.Insert(index, dataItem);

        return SaveChangesToServerAsync();
    }

    protected PropertyInfo? GetDataItemPropertyInfo(string propertyName)
        => typeof(TDataItem).GetProperty(propertyName);
    
    private async Task OnCustomizeEditModel(GridCustomizeEditModelEventArgs e)
    {
        var editModel = (e.EditModel as TDataItem)!;

        if (e.IsNew)
        {
            if (!HasIdValue(editModel)) SetNewId(editModel);

            if (ParentDataItem != null && !KeyFieldNameToParentId.IsNullOrWhiteSpace())
            {
                KeyFieldPropertyInfoToParent ??= GetDataItemPropertyInfo(KeyFieldNameToParentId);
                KeyFieldPropertyInfoToParent!.SetValue(editModel, ParentDataItem.Id);
            }

            e.EditModel = editModel;
        }

        await OnGridCustomizeEditModel.InvokeAsync(e);
    }
    
    private async Task OnEditStart(GridEditStartEventArgs e)
    {
        var dataItem = (e.DataItem as TDataItem)!;

        await OnGridEditStart.InvokeAsync(e);
    }

    //void Grid_CustomizeEditModel(GridCustomizeEditModelEventArgs e)
    //{
    //    var model = e.EditModel as EditableWorkOrder;
    //    if (model == null)
    //    {
    //        model = new EditableWorkOrder();

    //        model.WorkOrderNum = "123";
    //        model.Description = "hey";

    //        e.EditModel = model;
    //    }
    //}
    private async Task OnItemSaving(GridEditModelSavingEventArgs e)
    {
        var dataItem = (e.EditModel as TDataItem)!;

        if (e.IsNew)
        {
            if (!HasIdValue(dataItem)) SetNewId(dataItem);

            //if (ParentDataItem != null && !KeyFieldNameToParentId.IsNullOrWhiteSpace())
            //{
            //    Type examType = typeof(TDataItem);

            //    // Change the static property value.
            //    PropertyInfo piShared = examType.GetProperty(KeyFieldNameToParentId);
            //    piShared.SetValue(dataItem, ParentDataItem.Id);
            //}
        }

        var logText = e.IsNew ? "add" : "update";
        Logger.Debug($"{_gridLogName} OnItemSaving {logText}; Id: {dataItem.Id}");

        await OnGridEditModelSaving.InvokeAsync(e);

        if (e.Cancel)
        {
            Logger.Debug($"{_gridLogName} OnItemSaving {logText} canceled; Id: {dataItem.Id}");
            return;
        }

        if (e.IsNew)
        {
            if (EditNewRowPosition is GridEditNewRowPosition.FixedOnTop or GridEditNewRowPosition.Top) await AddDataItemAsync(dataItem);
            else await InsertDataItemAsync(0, dataItem);
        }
        else await UpdateDataItemAsync(dataItem);

        //var equalityComparer = EqualityComparer<TId>.Default;
        //var index = CollectionExtensions.FindIndex(_dataSource, x => equalityComparer.Equals(x.Id, dataItem.Id));
        //_dataSource.UpdateCollectionByIndex(index, dataItem, false);

        //_dataSource.UpdateCollectionById<TId>(dataItem.Id, false);
    }

    private Task SaveChangesToServerAsync()
    {
        try
        {
            return _dataSource.SaveChangesAsync();
        }
        catch (Exception ex)
        {
            Logger.Error($"{_gridLogName} SaveChangesToServerAsync->SaveChangesAsync error!", ex);
        }

        return Task.CompletedTask;
    }

    private async Task<bool> SaveChangesToServer()
    {
        var result = false;

        try
        {
            var unsavedItems = await _dataSource.SaveChanges();

            if (!(result = unsavedItems.Count == 0))
                Logger.Error($"{_gridLogName} SaveChangesToServer->SaveChanges error! unsavedCount: {unsavedItems.Count}");
        }
        catch (Exception ex)
        {
            Logger.Error($"{_gridLogName} OnItemSaving", ex);
        }

        return result;
    }

    private async Task OnItemDeleting(GridDataItemDeletingEventArgs e)
    {
        Logger.Debug($"{_gridLogName} OnItemDeleting");

        await OnGridItemDeleting.InvokeAsync(e);

        if (e.Cancel)
        {
            Logger.Debug($"{_gridLogName} OnItemDeleting canceled");
            return;
        }

        var dataItem = (e.DataItem as TDataItem)!;
        await RemoveDataItem(dataItem);
    }

    private void OnCustomizeElement(GridCustomizeElementEventArgs e)
    {
        if (e.ElementType == GridElementType.DetailCell)
        {
            e.Style = "padding: 0.5rem; opacity: 0.75";
        }
        else if (false && e.ElementType == GridElementType.DataCell && e.Column.Name == nameof(IId<TId>.Id))
        {
            e.Column.Visible = AcDomain.IsDeveloperVersion;
            e.Column.ShowInColumnChooser = AcDomain.IsDeveloperVersion;
        }
    }

    protected override async Task SetParametersAsyncCore(ParameterView parameters)
    {
        await base.SetParametersAsyncCore(parameters);

        if (!IsFirstInitializeParameterCore)
        {
            //if (typeof(TDataItem) is IId<TId> || typeof(TDataItem) is IId<TId>)
            KeyFieldName = "Id";

            base.DataItemDeleting = EventCallback.Factory.Create<GridDataItemDeletingEventArgs>(this, OnItemDeleting);
            base.EditModelSaving = EventCallback.Factory.Create<GridEditModelSavingEventArgs>(this, OnItemSaving);
            base.CustomizeEditModel = EventCallback.Factory.Create<GridCustomizeEditModelEventArgs>(this, OnCustomizeEditModel);
            base.EditStart = EventCallback.Factory.Create<GridEditStartEventArgs>(this, OnEditStart);

            CustomizeElement += OnCustomizeElement;

            //ShowFilterRow = true;
            //PageSize = 4;
            //ShowGroupPanel = true;
            //AllowSort = false;

            TextWrapEnabled = false;
            AllowSelectRowByClick = true;
            HighlightRowOnHover = true;
            AutoCollapseDetailRow = true;
            AutoExpandAllGroupRows = false;
            //KeyboardNavigationEnabled = true;

            //var dataColumns = GetDataColumns();

            //var idColumn = dataColumns.FirstOrDefault(x => x.FieldName == nameof(IId<TId>.Id));
            //if (idColumn != null)
            //{
            //    idColumn.ShowInColumnChooser = AcDomain.IsDeveloperVersion;
            //    idColumn.Visible = !AcDomain.IsDeveloperVersion;
            //}

            IsFirstInitializeParameterCore = true;
        }
    }


    protected override void OnParametersSet()
    {
        if (!IsFirstInitializeParameters)
        {
            if (GridName.IsNullOrWhiteSpace()) GridName = $"{typeof(TDataItem).Name}Grid";
            _gridLogName = $"[{GridName}]";

            IsFirstInitializeParameters = true;
        }

        base.OnParametersSet();
    }

    //public Task AddDataItem(TDataItem dataItem, int messageTag) => PostDataToServerAsync(dataItem, messageTag, TrackingState.Add);

    public Task UpdateDataItem(TDataItem dataItem) => _dataSource.Update(dataItem, true);

    public Task UpdateDataItemAsync(TDataItem dataItem)
    {
        _dataSource.Update(dataItem, false);
        return SaveChangesToServerAsync();
    }
    //public Task UpdateDataItem(TDataItem dataItem, int messageTag) => PostDataToServerAsync(dataItem, messageTag, TrackingState.Update);

    public Task AddOrUpdateDataItem(TDataItem dataItem) => _dataSource.AddOrUpdate(dataItem, true);

    public Task RemoveDataItem(TDataItem dataItem) => _dataSource.Remove(dataItem, true);
    //public Task RemoveDataItem(TDataItem dataItem, int messageTag) => PostDataToServerAsync(dataItem, messageTag, TrackingState.Remove);

    public Task RemoveDataItem(TId id) => RemoveDataItem(id, RemoveMessageTag);

    public Task RemoveDataItem(TId id, int messageTag)
    {
        return _dataSource.Remove(id, true);
    }

    public Task ReloadDataSourceAsync()
    {
        return _dataSource.LoadDataSourceAsync(false);
    }
}

public class GridDataItemChangingEventArgs<TDataItem> : GridDataItemChangedEventArgs<TDataItem> where TDataItem : class
{
    internal GridDataItemChangingEventArgs(IMgGridBase grid, TDataItem dataItem, TrackingState trackingState) : base(grid, dataItem, trackingState)
    {
    }

    public bool IsCanceled { get; set; }
}

public class GridDataItemChangedEventArgs<TDataItem> where TDataItem : class
{
    internal GridDataItemChangedEventArgs(IMgGridBase grid, TDataItem dataItem, TrackingState trackingState)
    {
        Grid = grid ?? throw new ArgumentNullException(nameof(grid));
        DataItem = dataItem;
        TrackingState = trackingState;
    }

    public IMgGridBase Grid { get; }
    public TDataItem DataItem { get; }
    public TrackingState TrackingState { get; }
    public bool CancelStateChangeInvoke { get; set; }
}