dbMango/Rms.Risk.Mango.Pivot.UI/Pivot/PivotDrilldownComponent.razor

@using Rms.Risk.Mango.Pivot.Core

@*
 *                                dbMango
 *
 * Copyright 2025 Deutsche Bank AG
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *@
<style>
    .code-editor {
    min-height: 150px;
    font-family: monospace;
    }
</style>

<form class="@Class">
    <div class="@_rowClass">
        <div class="form-group mr-3">
            <label for="DrillFiled">Field to drilldown into:</label>
            <div class="input-group mr-sm-2">
                <div class="dropdown">
                    <button id="DrillFiled" class="btn btn-secondary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                        @CurrentField
                    </button>
                    <div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
                        @foreach (var d in Pivot?.Drilldown ?? [])
                        {
                            <a class="dropdown-item" @onclick="() => SelectDrilldown(d)" @onclick:preventDefault>@d.ColumnName</a>
                        }
                    </div>
                </div>

                <button type="button" class="btn btn-secondary ml-3" @onclick="OnAdd" title="Add another field">
                    <span class="ui-icon-font icon-document-add"></span>
                </button>
                <button type="button" class="btn btn-secondary" disabled="@IsDeleteDisabled" @onclick="OnDelete" title="Remove current drilldown rule">
                    <span class="ui-icon-font icon-trash-sm"></span>
                </button>
            </div>
        </div>
    </div>

    @if (CurrentDrilldownDef != null)
    {
        <div class="@_rowClass">
            <div class="form-group w-100 mr-3">
                <label for="ColumnName">Field name</label>
                <div class="input-group mr-sm-2">
                    <input class="w-100 form-control" @bind="CurrentDrilldownDef.ColumnName" id="ColumnName"/>
                </div>
            </div>
        </div>

        <div class="@_rowClass">
            <div class="form-group w-100 mr-3">
                <label for="AllPivots">Pivot to drilldown into:</label>
                <div class="input-group mr-sm-2">
                    <div class="dropdown">
                        <button id="AllPivots" class="btn btn-secondary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                            @CurrentDrilldownDef?.DrilldownPivot
                        </button>
                        <div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
                            @foreach (var d in AllPivots)
                            {
                                if (d.IsGroup)
                                {
                                    <label>@d.Text</label>
                                }
                                else
                                {
                                    <a class="dropdown-item" @onclick="() => SelectDrilldownPivot(d.Pivot.Name)" @onclick:preventDefault>@d.Pivot.Name</a>
                                }
                            }
                        </div>
                    </div>
                </div>
            </div>
        </div>

        <div class="@_rowClass">
            <div class="form-group w-100 mr-3">
                <label for="filter">Append to filter</label>
                <div class="input-group mr-sm-2">
                    <textarea class="w-100 form-control code-editor" @bind="CurrentDrilldownDef!.DrilldownCondition" id="filter" rows="10"></textarea>
                </div>
            </div>
        </div>

        <div class="@_rowClass">
            <div class="form-group w-100 mr-3">
                <label for="filter2">Append before grouping</label>
                <div class="input-group mr-sm-2">
                    <textarea class="w-100 form-control code-editor" @bind="CurrentDrilldownDef!.AppendToBeforeGrouping" id="filter2" rows="10"></textarea>
                </div>
            </div>
        </div>
    }
</form>

@code {
    [Parameter] public string Class { get; set; } = "";

    [Parameter]
    public PivotDefinition? Pivot
    {
        get;
        set
        {
            if (field == value)
                return;

            field = value;
            CurrentDrilldownDef = field?.Drilldown.FirstOrDefault();
            InvokeAsync(StateHasChanged);
        }
    } = null!;

    [Parameter] public List<GroupedPivot> AllPivots { get; set; } = [];


    private PivotDefinition.DrilldownDef? CurrentDrilldownDef { get; set; }
    private string                        CurrentField        => CurrentDrilldownDef?.ColumnName ?? "";

    private string _rowClass = "";

    private Task SelectDrilldown(PivotDefinition.DrilldownDef? d)
    {
        if (d == null)
            return Task.CompletedTask;

        CurrentDrilldownDef = d;
        return InvokeAsync(StateHasChanged);
    }

    private Task SelectDrilldownPivot(string? pivotName)
    {
        if (CurrentDrilldownDef == null)
            return Task.CompletedTask;
        CurrentDrilldownDef.DrilldownPivot = pivotName ?? Pivot?.Name ?? "";
        return InvokeAsync(StateHasChanged);
    }

    private Task OnDelete()
    {
        if (IsDeleteDisabled || Pivot == null)
            return Task.CompletedTask;

        Pivot.Drilldown.Remove(CurrentDrilldownDef!);

        CurrentDrilldownDef = Pivot.Drilldown.FirstOrDefault();
        return InvokeAsync(StateHasChanged);
    }

    public bool IsDeleteDisabled => (Pivot?.Drilldown?.Count ?? 0) == 0;

    private Task OnAdd()
    {
        if (Pivot == null)
            return Task.CompletedTask;

        var d = new PivotDefinition.DrilldownDef
        {
            ColumnName = "Type column name here",
            DrilldownPivot = Pivot.Name
        };
        Pivot.Drilldown.Add(d);
        CurrentDrilldownDef = d;
        return InvokeAsync(StateHasChanged);
    }

}