// Copyright (c) MudBlazor 2021
// MudBlazor licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Linq.Expressions;
using System.Text.Json;
using Connected.Annotations;
using Connected.Utilities;
using Microsoft.AspNetCore.Components;

namespace Connected.Components;

[RequiresUnreferencedCode(CodeMessage.SerializationUnreferencedCodeMessage)]
public partial class Column<T> : UIComponent
{
   [CascadingParameter] public DataGrid<T> DataGrid { get; set; }

   //[CascadingParameter(Name = "HeaderCell")] public HeaderCell<T> HeaderCell { get; set; }

   [Parameter] public T Value { get; set; }
   [Parameter] public EventCallback<T> ValueChanged { get; set; }

   //[Parameter] public bool Visible { get; set; } = true;

   /// <summary>
   /// Specifies the name of the object's property bound to the column
   /// </summary>
   [Parameter] public string Field { get; set; }

   [Parameter] public Type FieldType { get; set; }
   [Parameter] public string Title { get; set; }
   [Parameter] public bool HideSmall { get; set; }
   [Parameter] public int FooterColSpan { get; set; } = 1;
   [Parameter] public int HeaderColSpan { get; set; } = 1;
   [Parameter] public RenderFragment ChildContent { get; set; }
   [Parameter] public RenderFragment<HeaderContext<T>> HeaderTemplate { get; set; }
   [Parameter] public RenderFragment<CellContext<T>> CellTemplate { get; set; }
   [Parameter] public RenderFragment<FooterContext<T>> FooterTemplate { get; set; }
   [Parameter] public RenderFragment<GroupDefinition<T>> GroupTemplate { get; set; }
   [Parameter] public Func<T, object> GroupBy { get; set; }

   #region HeaderCell Properties

   [Parameter] public string HeaderClass { get; set; }
   [Parameter] public Func<T, string> HeaderClassFunc { get; set; }
   [Parameter] public string HeaderStyle { get; set; }
   [Parameter] public Func<T, string> HeaderStyleFunc { get; set; }

   /// <summary>
   /// Determines whether this columns data can be sorted. This overrides the Sortable parameter on the DataGrid.
   /// </summary>
   [Parameter] public bool? Sortable { get; set; }

   [Parameter] public bool? Resizable { get; set; }

   /// <summary>
   /// Determines whether this columns data can be filtered. This overrides the Filterable parameter on the DataGrid.
   /// </summary>
   [Parameter] public bool? Filterable { get; set; }

   [Parameter] public bool? ShowFilterIcon { get; set; }

   /// <summary>
   /// Determines whether this column can be hidden. This overrides the Hideable parameter on the DataGrid.
   /// </summary>
   [Parameter] public bool? Hideable { get; set; }

   [Parameter] public bool Hidden { get; set; }
   [Parameter] public EventCallback<bool> HiddenChanged { get; set; }

   /// <summary>
   /// Determines whether to show or hide column options. This overrides the ShowColumnOptions parameter on the DataGrid.
   /// </summary>
   [Parameter] public bool? ShowColumnOptions { get; set; }

   [Parameter]
   public Func<T, object> SortBy
   {
      get
      {
         return GetLocalSortFunc();
      }
      set
      {
         _sortBy = value;
      }
   }

   [Parameter] public SortDirection InitialDirection { get; set; } = SortDirection.None;
   [Parameter] public string SortIcon { get; set; } = Icons.Material.Filled.ArrowUpward;

   /// <summary>
   /// Specifies whether the column can be grouped.
   /// </summary>
   [Parameter] public bool? Groupable { get; set; }

   /// <summary>
   /// Specifies whether the column is grouped.
   /// </summary>
   [Parameter] public bool Grouping { get; set; }

   /// <summary>
   /// Specifies whether the column is sticky.
   /// </summary>
   [Parameter] public bool StickyLeft { get; set; }

   [Parameter] public bool StickyRight { get; set; }

   [Parameter] public RenderFragment<FilterContext<T>> FilterTemplate { get; set; }

   private CultureInfo _culture;
   /// <summary>
   /// The culture used to represent this column and by the filtering input field.
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Table.Appearance)]
   public CultureInfo Culture
   {
      get => _culture ?? DataGrid?.Culture;
      set
      {
         _culture = value;
      }
   }
   #endregion

   #region Cell Properties

   [Parameter] public string CellClass { get; set; }
   [Parameter] public Func<T, string> CellClassFunc { get; set; }
   [Parameter] public string CellStyle { get; set; }
   [Parameter] public Func<T, string> CellStyleFunc { get; set; }
   [Parameter] public bool IsEditable { get; set; } = true;
   [Parameter] public RenderFragment<CellContext<T>> EditTemplate { get; set; }

   #endregion

   #region FooterCell Properties

   [Parameter] public string FooterClass { get; set; }
   [Parameter] public Func<T, string> FooterClassFunc { get; set; }
   [Parameter] public string FooterStyle { get; set; }
   [Parameter] public Func<T, string> FooterStyleFunc { get; set; }
   [Parameter] public bool EnableFooterSelection { get; set; }
   [Parameter] public AggregateDefinition<T> AggregateDefinition { get; set; }

   #endregion

   public Action ColumnStateHasChanged { get; set; }

   internal string headerClassname =>
       new CssBuilder("mud-table-cell")
           .AddClass("mud-table-cell-hide", HideSmall)
           .AddClass("sticky-left", StickyLeft)
           .AddClass("sticky-right", StickyRight)
           .AddClass(Class)
       .Build();

   internal string cellClassname;
   //internal string cellClassname =>
   //    new CssBuilder("mud-table-cell")
   //        .AddClass("mud-table-cell-hide", HideSmall)
   //        .AddClass("sticky-right", StickyRight)
   //        .AddClass(Class)
   //    .Build();

   internal string footerClassname =>
       new CssBuilder("mud-table-cell")
           .AddClass("mud-table-cell-hide", HideSmall)
           .AddClass(Class)
       .Build();

   internal bool grouping;

   #region Computed Properties

   internal Type dataType
   {
      get
      {
         if (FieldType != null)
            return FieldType;

         if (Field == null)
            return typeof(object);

         if (typeof(T) == typeof(IDictionary<string, object>) && FieldType == null)
            throw new ArgumentNullException(nameof(FieldType));

         var t = typeof(T).GetProperty(Field).PropertyType;
         return Nullable.GetUnderlyingType(t) ?? t;
      }
   }

   // This returns the data type for an object when T is an IDictionary<string, object>.
   internal Type innerDataType
   {
      get
      {
         // Handle case where T is IDictionary.
         if (typeof(T) == typeof(IDictionary<string, object>))
         {
            // We need to get the actual type here so we need to look at actual data.
            // get the first item where we have a non-null value in the field to be filtered.
            var first = DataGrid.Items.FirstOrDefault(x => ((IDictionary<string, object>)x)[Field] != null);

            if (first != null)
            {
               return ((IDictionary<string, object>)first)[Field].GetType();
            }
            else
            {
               return typeof(object);
            }
         }

         return dataType;
      }
   }

   internal bool isNumber
   {
      get
      {
         return FilterOperator.NumericTypes.Contains(dataType);
      }
   }

   internal string computedTitle
   {
      get
      {
         return Title ?? Field;
      }
   }

   internal bool groupable
   {
      get
      {
         return Groupable ?? DataGrid?.Groupable ?? false;
      }
   }

   internal bool filterable
   {
      get
      {
         return Filterable ?? DataGrid?.Filterable ?? false;
      }
   }

   #endregion

   internal int SortIndex { get; set; } = -1;
   internal HeaderCell<T> HeaderCell { get; set; }

   private Func<T, object> _sortBy;
   internal Func<T, object> groupBy;
   internal HeaderContext<T> headerContext;
   internal FilterContext<T> filterContext;
   internal FooterContext<T> footerContext;

   [UnconditionalSuppressMessage("Trimming", "IL2046: 'RequiresUnreferencedCodeAttribute' annotations must match across all interface implementations or overrides.", Justification = "Suppressing because we annotating the whole component with RequiresUnreferencedCodeAttribute for information that generic type must be preserved.")]
   protected override void OnInitialized()
   {
      if (!Hideable.HasValue)
         Hideable = DataGrid?.Hideable;

      groupBy = GroupBy;
      CompileGroupBy();

      if (groupable && Grouping)
         grouping = Grouping;

      if (null != DataGrid)
         DataGrid.AddColumn(this);

      // Add the HeaderContext
      headerContext = new HeaderContext<T>(DataGrid);

      // Add the FilterContext
      if (filterable)
      {
         filterContext = new FilterContext<T>(DataGrid);
         var operators = FilterOperator.GetOperatorByDataType(dataType);
         filterContext.FilterDefinition = new FilterDefinition<T>()
         {
            DataGrid = this.DataGrid,
            Field = Field,
            FieldType = FieldType,
            Title = Title,
            Operator = operators.FirstOrDefault()
         };
      }

      // Add the FooterContext
      footerContext = new FooterContext<T>(DataGrid);
   }

   internal Func<T, object> GetLocalSortFunc()
   {
      if (null == _sortBy)
      {
         var type = typeof(T);

         // set the default SortBy
         if (type == typeof(IDictionary<string, object>))
         {
            if (FieldType == null)
               throw new ArgumentNullException(nameof(FieldType));

            var innerType = innerDataType;

            if (innerType == typeof(JsonElement))
            {
               _sortBy = x =>
               {
                  var json = (JsonElement)(x as IDictionary<string, object>)[Field];

                  if (FieldType == typeof(string))
                     return json.GetString();
                  else if (isNumber)
                     return json.GetDouble();
                  else
                     return json.GetRawText();
               };
            }
            else
            {
               _sortBy = x => Convert.ChangeType((x as IDictionary<string, object>)[Field], FieldType);
            }
         }
         else
         {
            var parameter = Expression.Parameter(type, "x");
            var field = Expression.Convert(Expression.Property(parameter, type.GetProperty(Field)), typeof(object));
            _sortBy = Expression.Lambda<Func<T, object>>(field, parameter).Compile();
         }
      }

      return _sortBy;
   }

   internal void CompileGroupBy()
   {
      if (groupBy == null && !string.IsNullOrWhiteSpace(Field))
      {
         var type = typeof(T);

         // set the default GroupBy
         if (type == typeof(IDictionary<string, object>))
         {
            groupBy = x => (x as IDictionary<string, object>)[Field];
         }
         else
         {
            var parameter = Expression.Parameter(type, "x");
            var field = Expression.Convert(Expression.Property(parameter, type.GetProperty(Field)), typeof(object));
            groupBy = Expression.Lambda<Func<T, object>>(field, parameter).Compile();
         }
      }
   }

   // Allows child components to change column grouping.
   internal void SetGrouping(bool g)
   {
      if (groupable)
      {
         grouping = g;
         DataGrid?.ChangedGrouping(this);
      }
   }

   /// <summary>
   /// This method's sole purpose is for the DataGrid to remove grouping in mass.
   /// </summary>
   internal void RemoveGrouping()
   {
      grouping = false;
   }

   public async Task HideAsync()
   {
      Hidden = true;
      await HiddenChanged.InvokeAsync(Hidden);
   }

   public async Task ShowAsync()
   {
      Hidden = false;
      await HiddenChanged.InvokeAsync(Hidden);
   }

   public async Task ToggleAsync()
   {
      Hidden = !Hidden;
      await HiddenChanged.InvokeAsync(Hidden);
      DataGrid.ExternalStateHasChanged();
   }
}