dbMango/Rms.Risk.Mango/Pages/User/Delete.razor

@page "/user/delete"
@page "/user/delete/{DatabaseStr}/{CollectionStr}"
@page "/user/delete/{DatabaseStr}/{DatabaseInstanceStr}/{CollectionStr}"
@attribute [Authorize]
@using Rms.Risk.Mango.Components.Commands

@inject NavigationManager NavigationManager
@inject IUserSession       UserSession
@inject IJSRuntime        JsRuntime

@*
 *                                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>
    .js-field {
        height: 300px;
        position: relative;
    }

    .res-field {
        width: 100vw;
        height: calc(100vh - (150px + 300px));
        overflow: auto;
    }

    pre {
        width: 100%;
        height: 100%;
        font-size: 10pt;
        background-color: #1d2a3b;
        color: #FFFFFF;
    }

    .CodeMirror {
        width: 600px !important;
        height: 300px !important;
        max-height: 300px !important;
    }

    .cmd-json {
        width: 840px;
    }

</style>

<h3 class="mt-3">Delete</h3>

<AuthorizedOnly Policy="WriteAccess" Resource="@UserSession.Database">
    <EditForm EditContext="EditContext">

        <div class="form-row">
            <FormItemSelect Enabled="@IsReady" Class="mr-2" Name="Collection" @bind-Value="SelectedCollection" Values="@Collections" Icon="icon-folder-outline-sm" />
            <FormItemText Enabled="@IsReady" Class="mr-2" Name="Timeout (sec)" @bind-Value="Timeout" InputType="number" Icon="icon-clock-sm" />
            <div class="form-group">
                <label>&nbsp;</label>
                <FormButton Enabled="@IsReadyToRun" Name="Run" Icon="icon-running-man-sm" OnClick="Execute" IsPrimary="true" />
            </div>
        </div>

    </EditForm>

    <CmdDeleteDocuments Collection="@SelectedCollection" Parameters="@_commandParams"/>

    @if (!string.IsNullOrWhiteSpace(Error))
    {
        <pre class="wf-converter-syntax-error">@Error</pre>
    }
</AuthorizedOnly>

@code {
    [CascadingParameter] public IModalService Modal { get; set; } = null!;

    [Parameter] public string? DatabaseStr         { get; set; }
    [Parameter] public string? DatabaseInstanceStr { get; set; }
    [Parameter] public string? CollectionStr       { get; set; }

    private IReadOnlyCollection<string> Collections { get; set; } = [];

    private string SelectedCollection
    {
        get => UserSession.Collection;
        set
        {
            if (UserSession.Collection == value)
                return;
            UserSession.Collection = value;
            SyncUrl();
            Error = "";
            InvokeAsync(StateHasChanged);
        }
    }

    private string Database
    {
        get => UserSession.Database;
        set
        {
            if (UserSession.Database == value)
                return;
            UserSession.Database = value;
            SyncUrl();
        }
    }

    private string DatabaseInstance
    {
        get => UserSession.DatabaseInstance;
        set
        {
            if (UserSession.DatabaseInstance == value)
                return;
            UserSession.DatabaseInstance = value;
            SyncUrl();
        }
    }

    private CmdBase.CommandParams _commandParams = null!;

    private string Timeout { get; set; } = "20";
    private string Error { get; set; } = "";

    private bool IsReady { get; set; }
    private bool IsReadyToRun => IsReady && CanExecute && !string.IsNullOrWhiteSpace(CommandJson);

    private EditContext? _editContext;
    private EditContext  EditContext => _editContext!;

    private string CommandName      => _commandParams.Name;
    private string CommandJson      => _commandParams.CommandJson;
    private bool   CanExecute       => _commandParams.CanExecute;
    private bool   NeedConfirmation => _commandParams.NeedConfirmation;

    private List<BsonDocument> Result
    {
        get => _commandParams.Result;
        set => _commandParams.Result = value;
    }

    protected override void OnInitialized()
    {
        _editContext  = new(this);
        _commandParams = new("Delete Documents", OnChanged);
    }

    private void OnChanged(CmdBase.CommandParams arg)
    {
        InvokeAsync(StateHasChanged);
    }

    protected override void OnAfterRender(bool firstRender)
    {
        if (!firstRender)
            return;

        if (string.IsNullOrWhiteSpace(DatabaseStr))
            DatabaseStr = Database;
        else
            Database = DatabaseStr;

        if (string.IsNullOrWhiteSpace(DatabaseInstanceStr))
            DatabaseInstanceStr = DatabaseInstance;
        else
            DatabaseInstance = DatabaseInstanceStr;

        if (string.IsNullOrWhiteSpace(CollectionStr))
            CollectionStr = SelectedCollection;
        else
            SelectedCollection = CollectionStr;

        SyncUrl();

        _ = Task.Run(async () =>
        {
            try
            {
                var admin = UserSession.MongoDbAdmin;

                Collections = await admin.ListCollections();
                if (!Collections.Contains(SelectedCollection))
                    SelectedCollection = Collections.FirstOrDefault() ?? "";

                IsReady = true;
                await InvokeAsync(StateHasChanged);
            }
            catch (Exception e)
            {
                await Display(e);
            }
        });
        SyncUrl();
        StateHasChanged();
    }

    private Task Display(Exception e)
    {
        Error = e.ToString();
        return InvokeAsync(StateHasChanged);
    }

    private Task Display(List<BsonDocument> res)
    {
        Result = res;
        return InvokeAsync(StateHasChanged);
    }

    private async Task<List<BsonDocument>> RunCommand(BsonDocument doc, CancellationToken token) 
        => [await UserSession.MongoDbAdmin.RunCommand(doc, token)];

    private void SyncUrl()
    {
        var url = NavigationManager.BaseUri + $"user/delete/{Database}";
        if (!string.IsNullOrWhiteSpace(DatabaseInstance))
            url += $"/{DatabaseInstance}";
        url += $"/{SelectedCollection}";

        JsRuntime.InvokeAsync<string>("DashboardUtils.ChangeUrl", url);
    }

    private Task<string?> CanExecuteCommand()
        => Shell.CanExecuteCommand(UserSession, InvokeAsync, Modal);


    private async Task Execute()
    {
        Error = "";
        if (string.IsNullOrWhiteSpace(CommandJson))
            return;

        if (NeedConfirmation)
        {
            var res = await ModalDialogUtils.ShowConfirmationDialog(Modal, "Confirmation", $"Are you sure executing command \"{CommandName}\"? Some command's effects are irreversible!");
            if (!res.Confirmed)
                return;
        }

        var ticket = await CanExecuteCommand();
        if (string.IsNullOrWhiteSpace(ticket))
            return;

        var cts = new CancellationTokenSource(TimeSpan.FromSeconds(int.Parse(Timeout)));

        try
        {
            IsReady = false;
            await InvokeAsync(StateHasChanged);

            var doc  = BsonDocument.Parse(CommandJson);
            Shell.UpdateComment(doc, ticket, UserSession.User.GetEmail());

            var res = await RunCommand(doc, cts.Token);
            await Display(res);
        }
        catch (Exception e)
        {
            await Display(e);
        }
        finally
        {
            IsReady = true;
            await InvokeAsync(StateHasChanged);
        }

    }


}