@page "/user/audit"
@page "/user/audit/{DatabaseStr}"
@page "/user/audit/{DatabaseStr}/{DatabaseInstanceStr}"
@attribute [Authorize]
@using Rms.Risk.Mango.Services.Audit

@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;
    }
</style>

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

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

        <div class="form-row">
            <FormItemDate     Enabled="@IsReady" Class="mr-2" Name="Date range"     @bind-StartDate="StartDate" @bind-EndDate="EndDate" SelectDateRange="true"/>
            <FormItemText     Enabled="@IsReady" Class="mr-2" Name="Max fetch size" @bind-Value="FetchSize" InputType="number" Icon="icon-download-selected-sm" />
            <div class="form-group">
                <label>&nbsp;</label>
                <FormButton Enabled="@IsReady" Name="Run" Icon="icon-running-man-sm" OnClick="Run" IsPrimary="true"/>
            </div>
        </div>

    </EditForm>

    @if (ShowAsJson)
    {
        <FormJson Class="res-field row" Value="@Result"/>
    }
    else
    {
        <SimplePivotComponent
            PivotName="audit"
            CollectionName="audit"
            PivotData="@ResultPivot"
            HandleCellClick="@OnCellClick"
            GetColumnDescriptor="@GetColumnDescriptor"
            />
    }
</AuthorizedOnly>

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

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

    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 string FetchSize { get; set; } = "100";
    private bool      IsReady    { get; set; } = true;
    private bool      ShowAsJson { get; set; }
    private DateOnly? StartDate  { get; set; } = DateOnly.FromDateTime(DateTime.UtcNow - TimeSpan.FromDays(7));
    private DateOnly? EndDate    { get; set; } = DateOnly.FromDateTime(DateTime.UtcNow);

    private string              Result      { get; set; } = "{}";
    private List<BsonDocument>  ResultBson  { get; set; } = [];
    private ArrayBasedPivotData ResultPivot { get; set; } = new([]);



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

    protected override void OnInitialized()
    {
        _editContext = new (this);
    }

    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;

        UserSession.Collection = AuditService.AuditCollection;

        SyncUrl();
    }

    private async Task Run()
    {
        var cts = new CancellationTokenSource(TimeSpan.FromSeconds(20));

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

            var res = await RunAudit(cts.Token);
            //            var res = await RunAuditFind(cts.Token);

            ResultPivot = res.Item1;
            ResultBson = res.Item2;

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

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

    private Task Display(IEnumerable<BsonDocument> res)
    {
        Result = res.ToJson(new() { Indent = true });
        return InvokeAsync(StateHasChanged);
    }

    private async Task<(ArrayBasedPivotData, List<BsonDocument>)> RunAudit(CancellationToken token)
    {
        if (StartDate == null || EndDate == null)
            return (ArrayBasedPivotData.NoData,[]);

        var audit = UserSession.Audit;
        var res = await audit.Audit(StartDate.Value.ToDateTime(TimeOnly.MinValue), EndDate.Value.ToDateTime(TimeOnly.MaxValue), token);

        var pd = new ArrayBasedPivotData([
            "Timestamp UTC",
            "Collection"   ,
            "Command"      ,
            "Success"      ,
            "Ticket"       ,
            "Email"        ,
            "Comment"      ,
            "Error"        ,
            "Json"         ,
            "_id"
    ]);

        var list = new List<BsonDocument>();
        var id   = 0;
        foreach (var auditRecord in res)
        {
            var row = new object?[pd.Headers.Count];
            var i   = 0;

            row[i++] = auditRecord.Timestamp;
            row[i++] = auditRecord.Command.ElementAt(0).Value.ToString() ?? "";
            row[i++] = auditRecord.Command.ElementAt(0).Name; 
            row[i++] = auditRecord.Success;
            row[i++] = auditRecord.Ticket;
            row[i++] = auditRecord.Email;
            row[i++] = auditRecord.Command.GetValue("comment", "").ToString();
            row[i++] = auditRecord.Error;
            row[i++] = auditRecord.Command.ToJson(new(){ Indent = true });
            row[i  ] = ++id;

            var json = auditRecord.ToJson(new() { Indent = true });
            var d = BsonDocument.Parse(json);
            d["_id"] = id;

            pd.Add(row);
            list.Add(d);
        }

        if (list.Count == 0)
            list.Add(BsonDocument.Parse("{\"Result\": \"No data fetched\"}"));
        else
        {
            var newPd = (ArrayBasedPivotData)pd.FilterColumns(
            [
                "Timestamp UTC" ,
                "Collection"    ,
                "Command"       ,
                "Success"       ,
                "Ticket"        ,
                "Email"         ,
                "Comment"       ,
                "Error"         ,
                "_id"
            ]);
            pd = newPd;
        }

        return (pd, list);
    }

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

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

    private async Task<bool> OnCellClick(DynamicObject row, string columnName)
    {
        try
        {
            var id = TableControl.GetDynamicMember(row, "_id");
            if (id == null)
                return true;

            var bson = ResultBson.FirstOrDefault(x => x["_id"].ToString() == id.ToString());
            if (bson == null)
                return true;

//            var oldId = bson["_id"];

            // _ = await Auth.AuthorizeAsync(
            //     UserSession.User.GetUser(), 
            //     UserSession.Database, 
            //     [new ReadAccessRequirement()]);

            _ = await Find.ShowBsonDialog(Modal, id.ToString()!, bson, false);
        }
        catch (Exception e)
        {
            await ModalDialogUtils.ShowExceptionDialog(Modal, "Error", e);
        }
        return true;
    }


    private PivotColumnDescriptor? GetColumnDescriptor(string column)
    {
        if (column != "Timestamp UTC")
            return null;

        return new()
        {
            Format = "yyyy-MM-dd HH:mm:ss"
        };
    }

}