@page "/user/pivot"
@page "/user/pivot/{DatabaseStr}/{DatabaseInstanceStr}"
@page "/user/pivot/{DatabaseStr}/{DatabaseInstanceStr}/{Collection}/{PivotName}"
@* @page "/user/pivot/{DatabaseStr}/{DatabaseInstanceStr}/{Collection}/{PivotName}/{Parameters}" *@

@attribute [Authorize]

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

@*
 *                                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.
 *@

<link rel="stylesheet" href="css/pivot.css" />

<h3>Pivot</h3>

<AuthorizedOnly Policy="ReadAccess" Resource="@UserSession.Database">
    <PivotComponent PivotService="@UserSession.PivotDataSource"
                    Collections="@_collections"
                    @bind-Collection="Collection"
                    @bind-Pivot="PivotName"
                    @bind-Rows="_state.Rows"
                    PivotType="@IPivotTableDataSource.PivotType.All"
                    GetExtraFilter="@GetExtraFilter"
                    CurrentPivotChanged="@OnCurrentPivotChanged">
        <ExtraFilter>

            <PivotGenericExtraFilterControl 
                Collection="@Collection"
                LoadFilterDef = "true"
                FilterDef="@_extraFilterDef"
                ExtraFilter="@_extraFilter"
                ExtraFilterChanged="@(x => SetExtraFilter(x))"
                PivotService="@UserSession.PivotDataSource"
                Class="mb-2 ml-1 form-row" />

        </ExtraFilter>
    </PivotComponent>

    @* Share="Share" *@
</AuthorizedOnly>

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

    [Parameter]
    public string? Collection
    {
        get;
        set
        {
            if (field == value)
                return;
            field = value;
            if (field != null && _state.SelectedPivotForCollection.TryGetValue(field, out var pivot))
            {
                PivotName = pivot;
                InvokeAsync(StateHasChanged);
            }
            SyncUrl();
        }
    }

    [Parameter]
    public string? PivotName
    {
        get;
        set
        {
            if (field == value)
                return;
            field = value;
            if (!string.IsNullOrWhiteSpace(field) && !string.IsNullOrWhiteSpace(Collection))
                _state.SelectedPivotForCollection[Collection] = field;
            SyncUrl();
        }
    }

    private string? _currentUrl;

    private class PivotState
    {
        public int                        Rows                       { get; set; } = 40;
        public Dictionary<string, string> SelectedPivotForCollection { get; set; } = new();
    }

    private PivotState _state = new();
    private FilterExpressionTree.ExpressionGroup _extraFilter = new();
    private FilterExpressionTree.ExpressionGroup GetExtraFilter() => _extraFilter;

    private readonly List<GroupedCollection> _collections = [];

    private const string DefaultCollectionName = "Default";
    private const string DefaultPivotName      = "Summary";

    private ExtraFilterDefinition          _extraFilterDef = new();

    protected override async Task OnParametersSetAsync()
    {
        if (UserSession == null || _extraFilterDef.Filter.Count > 0 )
            return;

        if (DatabaseStr != UserSession.Database)
        {
            if (string.IsNullOrWhiteSpace(DatabaseStr))
                DatabaseStr = UserSession.Database;
            else
                UserSession.Database = DatabaseStr;
        }

        if (DatabaseInstanceStr != UserSession.DatabaseInstance)
        {
            if (string.IsNullOrWhiteSpace(DatabaseInstanceStr))
                DatabaseInstanceStr = UserSession.DatabaseInstance;
            else
                UserSession.DatabaseInstance = DatabaseInstanceStr;
        }

        if (_collections.Count == 0)
        {
            var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
            var collections = await UserSession.PivotDataSource.GetAllMeta(token: cts.Token);
            _collections.Clear();
            _collections.AddRange(collections);
        }



        if (string.IsNullOrWhiteSpace(Collection))
        {
            var collections = _collections
                .Where(x => !x.IsGroup)
                .Select(x => x.CollectionNameWithPrefix)
                .OrderBy(x => x)
                .ToList()
                ;

            Collection = collections.Contains(DefaultCollectionName)
                ? DefaultCollectionName
                : collections.FirstOrDefault();
        }

        if (string.IsNullOrWhiteSpace(PivotName) && !string.IsNullOrWhiteSpace(Collection))
        {
            var pivots = (_collections.FirstOrDefault( x => x.CollectionNameWithPrefix == Collection)?.Pivots ?? [])
                .Select(x => x.Pivot)
                .Select(x => x.Name)
                .OrderBy(x => x)
                .ToList()
                ;

            PivotName = pivots.Contains(DefaultPivotName)
                    ? DefaultPivotName
                    : pivots.FirstOrDefault();
        }

        _extraFilterDef = new()
        {
            Filter =
            [
                new()
                {
                    ControlType      = ExtraFilterDefinition.ControlTypeDropDown,
                    AllowMultiselect = true,
                    DisplayName      = "Department",
                    FieldName        = "Department",
//                    Values           = [.. DepartmentsList ],
                    SelectorCollection = ExtraFilterDefinition.CurrentCollectionSignature,
                    SelectorQuery = @"
[{
    ""$group"" : {
      ""_id"" : null,
      ""Department"" : {
        ""$addToSet"" : ""$Department""
      }
    }
  },
  { ""$unwind"" : ""$Department""}
]
"
                },

                new()
                {
                    ControlType      = ExtraFilterDefinition.ControlTypeDatePicker,
                    AllowMultiselect = true,
                    DisplayName      = "COB",
                    FieldName        = "COB",
//                    Values           = [.. await UserSession.PivotDataSource.GetCobDatesAsync(Collection!) ],
                    DefaultValue     = CobHelper.GetLatestCob().ToString(CobHelper.CobFormat),
                    SelectorCollection = ExtraFilterDefinition.CurrentCollectionSignature,
                    SelectorQuery = @"
[
  {
      ""$group"" : {
        ""_id"" : null,
        ""COB"" : {
          ""$addToSet"" : ""$COB""
        }
      }
  },
  { ""$unwind"" : ""$COB"" }
]
"
                }
            ]
        };

    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (!firstRender)
            return;

        var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
        var data = await JsRuntime.LoadFromLocalStorage<PivotState>("pivot", cts.Token);
        if ( data != null )
            _state = data;

        await InvokeAsync(StateHasChanged);

        SyncUrl();
    }

    private void SyncUrl()
    {
        var url = NavigationManager.BaseUri + "user/pivot";

        url += $"/{Uri.EscapeDataString(UserSession.Database)}";
        if (!string.IsNullOrWhiteSpace(UserSession.DatabaseInstance))
            url += $"/{UserSession.DatabaseInstance}";
        else
            url += "/default";

        if (!string.IsNullOrWhiteSpace(Collection) && !string.IsNullOrWhiteSpace(PivotName))
            url += $"/{Uri.EscapeDataString(Collection)}/{Uri.EscapeDataString(PivotName)}";

        var values = _extraFilterDef.ParseExtraFilter(_extraFilter);
        var qp = _extraFilterDef.CreateQueryParameters(values);

        var paramStr = string.Join("&", qp.Select(kv => $"{Uri.EscapeDataString(kv.Key)}={Uri.EscapeDataString(kv.Value)}"));
        if ( !string.IsNullOrWhiteSpace(paramStr))
            url += $"?{paramStr}";

        if (_currentUrl == url)
            return;

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

    private void SetExtraFilter(FilterExpressionTree.ExpressionGroup expressionGroup)
    {
        _extraFilter = expressionGroup;
        SyncUrl();
    }

    private async Task OnCurrentPivotChanged(PivotDefinition arg)
    {
        if (PivotName != null && Collection != null)
            _state.SelectedPivotForCollection[Collection] = PivotName;

        await InvokeAsync(async () => await JsRuntime.SaveToLocalStorage("pivot", _state));
    }

}