@using Telerik.DataSource

@System.Text.Json.JsonSerializer.Serialize(FilterValue)

<br />
<br />

<TelerikFilter @bind-Value="@FilterValue">
    <FilterFields>
        <FilterField Name="Field" Type="@(typeof(string))">
            <ValueTemplate>
                <TelerikTextBox Value="@((string)context.FilterDescriptor.Value)"
                                ValueChanged="@( (string newValue) => OnTextBoxValueChanged(context.FilterDescriptor, newValue) )"
                                DebounceDelay="0" />
            </ValueTemplate>
        </FilterField>
    </FilterFields>
</TelerikFilter>

@code {
    private void OnTextBoxValueChanged(FilterDescriptor templateFD, string newValue)
    {
        var originalFD = FilterValue.FilterDescriptors.OfType<FilterDescriptor>().FirstOrDefault(x =>
        {
            return x.Member == templateFD.Member &&
                x.MemberType == templateFD.MemberType &&
                x.Operator == templateFD.Operator &&
                x.Value == templateFD.Value;
        });

        if (originalFD != null)
        {
            templateFD.Value = newValue;
            originalFD.Value = newValue;
        }
    }

    private CompositeFilterDescriptor FilterValue { get; set; } = new()
    {
        LogicalOperator = FilterCompositionLogicalOperator.Or,
        FilterDescriptors = new FilterDescriptorCollection() {
             new FilterDescriptor()
            {
                Member = "Field",
                MemberType = typeof(string),
                Value = "Sample"
            }
         }
    };
}

@using Telerik.Blazor.Components
@using Telerik.DataSource
@using Telerik.DataSource.Extensions
@{
    var firstFilter = (Telerik.DataSource.FilterDescriptor?)FilterValue?.FilterDescriptors.FirstOrDefault();

    if (firstFilter is not null)
    {
        <div>
            firstFilter value:  @firstFilter.Value
        </div>
    }
}
    


<TelerikFilter Value="@FilterValue" ValueChanged="@OnValueChanged">
    <FilterFields>
        @foreach (var f in FilterFields)
        {
            if (nameof(Food.Price) == f.Name)
            {
                <FilterField Name="@f.Name" Type="@f.Type" Label="@f.Label" >
                    <ValueTemplate>
                        <TelerikNumericTextBox Value="@((decimal?)context.FilterDescriptor.Value)"
                                               ValueChanged="@( (decimal? value) => NumericValueChanged(context.FilterDescriptor, value) )">
                        </TelerikNumericTextBox>
                    </ValueTemplate>
                </FilterField>
            }
            else
            {
                <FilterField Name="@f.Name" Type="@f.Type" Label="@f.Label" />
            }
        }
    </FilterFields>
</TelerikFilter>

<TelerikGrid Data="@GridData"
             Height="400px">
    <GridColumns>
        <GridColumn Field="@(nameof(Food.Id))" />
        <GridColumn Field="@(nameof(Food.Name))" />
        <GridColumn Field="@(nameof(Food.Price))" />
        <GridColumn Field="@(nameof(Food.IsAvailable))" />
    </GridColumns>
</TelerikGrid>



@code {
    private List<Food> GridData { get; set; } = new();

    private List<Food> InitialData { get; set; } = new();

    private CompositeFilterDescriptor FilterValue { get; set; } = new();

    private List<string> Suggestions { get; set; } = new() { "Pasta", "Burger", "Pizza", "Kebab", "Steak", "Ice Cream" };

    private void OnFilterValueChanged(FilterDescriptor fd, string value)
    {
        fd.Value = value;

        ProcessGridData();
    }

    private void NumericValueChanged(FilterDescriptor fd, decimal? value)
    {
        fd.Value = value;
        var a = FilterValue;


        ProcessGridData();
    }

    private void OnValueChanged(CompositeFilterDescriptor value)
    {

        FilterValue = value;
        ProcessGridData();
    }

    private void ProcessGridData()
    {
        CompositeFilterDescriptor filter = FilterValue;

        var dataSourceRequest = new DataSourceRequest { Filters = new List<IFilterDescriptor> { filter } };

        var dataSourceResult = InitialData.ToDataSourceResult(dataSourceRequest);

        GridData = dataSourceResult.Data.Cast<Food>().ToList();
    }

    protected override void OnInitialized()
    {
        FilterValue.FilterDescriptors.Add(new FilterDescriptor { Member = nameof(Food.Price), Operator = FilterOperator.IsEqualTo, Value = Convert.ToDecimal(0), MemberType = typeof(decimal) });
        LoadData();
        base.OnInitialized();
    }

    private void LoadData()
    {
        InitialData = new List<Food>
        {
            new Food { Id = 1, Name = "Pasta", Price = 13.99m, IsAvailable = true},
            new Food { Id = 2, Name = "Burger", Price = 11.99m, IsAvailable = false},
            new Food { Id = 3, Name = "Pizza", Price = 16.99m, IsAvailable = true},
            new Food { Id = 4, Name = "Kebab", Price = 9.99m, IsAvailable = true },
            new Food { Id = 5, Name = "Steak", Price = 22.99m, IsAvailable = false },
            new Food { Id = 6, Name = "Salad", Price = 6.99m, IsAvailable = true},
            new Food { Id = 6, Name = "Ice Cream", Price = 4.99m, IsAvailable = true }
        };

        ProcessGridData();
    }

    public class Food
    {
        public int Id { get; set; }
        public string Name { get; set; } = string.Empty;
        public decimal Price { get; set; }
        public bool IsAvailable { get; set; }
    }

    public List<MyFilterField> FilterFields = new List<MyFilterField>
    {
        new MyFilterField { Name = nameof(Food.Price), Type = typeof(double?), Label = "Price" },
        new MyFilterField { Name = nameof(Food.Id), Type = typeof(int), Label = "Id" },
        new MyFilterField { Name = nameof(Food.Name), Type = typeof(string), Label = "Name" },
        new MyFilterField { Name = nameof(Food.IsAvailable), Type = typeof(bool), Label = "Is Available" }
    };

    public class MyFilterField
    {
        required public string Name { get; set; }
        required public Type Type { get; set; }
        required public string Label { get; set; }
    }

}

<TelerikFilter Value="@Value" ValueChanged="@OnValueChanged">
    <FilterFields>
        <FilterField Name="@nameof(OrderDetailDto.OrderId)" Type="typeof(int)" Label="Id" />
        <FilterField Name="@nameof(OrderDetailDto.Quantity)" Type="typeof(short)" />
        <FilterField Name="@nameof(OrderDetailDto.OrderFreight)" Type="@typeof(decimal)" Label="Freight" />
        <FilterField Name="@nameof(OrderDetailDto.OrderShipCountry)" Type="typeof(string)" Label="Country">
           <FilterValueTemplate>{{Some Template Here}}</FilterValueTemplate>
        </FilterField>
        <FilterField Name="@nameof(OrderDetailDto.OrderShipName)" Type="typeof(List<string>)" Label="Ship to">
           <FilterValueTemplate>{{Some Template Here}}</FilterValueTemplate>
        </FilterField>
        <FilterField Name="@nameof(OrderDetailDto.OrderShipAddress)" Type="typeof(string)" Label="Ship Address" />
    </FilterFields>
</TelerikFilter>