@inject IJSRuntime _js

@* Move JavaScript code to a separate JS file in production *@
<script suppress-error="BL9992">
    function uncheckGrid() {
        var checkboxes = document.querySelectorAll(".no-select .k-grid-checkbox");
        for (var i = 0; i < checkboxes.length; i++) {
            checkboxes[i].checked = false;
        }
    }
</script>

<style>
    .no-select {
        cursor: not-allowed;
    }

    .no-select .k-checkbox {
        pointer-events: none;
    }
</style>

<TelerikGrid Data=@GridData
             SelectionMode="@GridSelectionMode.Multiple"
             SelectedItemsChanged="@((IEnumerable<Employee> employeeList) => OnSelect(employeeList))"
             SelectedItems="@SelectedEmployees"
             Pageable="true"
             Height="400px">
    <GridColumns>
        <GridCheckboxColumn SelectAll="true" OnCellRender="@OnGridCellRender" />
        <GridColumn Field="@nameof(Employee.Name)" />
        <GridColumn Field="@nameof(Employee.Team)" />
        <GridColumn Field="@nameof(Employee.Active)" />
    </GridColumns>
</TelerikGrid>

@if (SelectedEmployees != null)
{
    <ul>
        @foreach (Employee employee in SelectedEmployees)
        {
            <li>
                @employee.Name
            </li>
        }
    </ul>
}

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

    private IEnumerable<Employee> SelectedEmployees { get; set; } = new List<Employee>();

    private void OnGridCellRender(GridCellRenderEventArgs args)
    {
        var product = (Employee)args.Item;
        if (!product.Active)
        {
            args.Class = "no-select";
        }
    }

    protected void OnSelect(IEnumerable<Employee> newSelected)
    {
        var validItemsToSelect = newSelected.Where(x => x.Active);
        SelectedEmployees = validItemsToSelect;
        if (validItemsToSelect.Count() < newSelected.Count())
        {
            _js.InvokeVoidAsync("uncheckGrid");
        }
    }

    protected override void OnInitialized()
    {
        for (int i = 1; i <= 7; i++)
        {
            GridData.Add(new Employee()
            {
                EmployeeId = i,
                Name = $"Employee {i}",
                Team = $"Team {i % 3 + 1}",
                Active = i % 2 == 0
            });
        }
    }

    public class Employee
    {
        public int EmployeeId { get; set; }
        public string Name { get; set; } = string.Empty;
        public string Team { get; set; } = string.Empty;
        public bool Active { get; set; }
    }
}