@page "/admin/{TableDisplayName}"
@layout HopFrameLayout
@rendermode InteractiveServer
@implements IDisposable

@using HopFrame.Core.Config
@using HopFrame.Core.Callbacks
@using HopFrame.Core.Services
@using HopFrame.Web.Models
@using HopFrame.Web.Plugins
@using HopFrame.Web.Plugins.Events
@using HopFrame.Web.Services
@using Microsoft.JSInterop

@if (!DisplaySelection) {
    <PageTitle>@_config?.DisplayName</PageTitle>
}

<FluentDialogProvider />

<div style="display: flex; flex-direction: column; height: 100%">
    <FluentToolbar Class="hopframe-toolbar">
        <h3>@_config?.DisplayName</h3>
        @if (!DisplaySelection && _buttonToggles.ShowRefreshButton) {
            <FluentButton
                IconStart="@(new Icons.Regular.Size16.ArrowClockwise())"
                OnClick="Reload"
                Loading="_loading"
                Style="margin-left: 10px">
                Refresh
            </FluentButton>
        }
        
        @foreach (var button in _pluginButtons.Where(pb => pb.IsForTable(_config)).Where(pb => pb.Position == PluginButtonPosition.TopLeft)) {
            <FluentButton
                IconStart="@(button.Icon?.GetInstance())"
                OnClick="() => button.Handler.Invoke(null!, _config!)">
                @button.Title
            </FluentButton>
        }
        
        <FluentSpacer />
        <div
            style="position: relative; height: 32px"
            class="hopframe-search">
            
            <FluentSearch
                @ref="_searchBox"
                @oninput="OnSearch"
                @onchange="OnSearch"
                @onfocusin="() => { SearchFocus(); UpdateSearchSuggestions(); }"
                @onfocusout="SearchUnfocus"
                Style="width: 500px"/>

            @if (_isSearchActive && _searchSuggestions.Count > 0) {
                <FluentListbox
                    TOption="string"
                    Items="_searchSuggestions"
                    SelectedOptionChanged="SearchSuggestionSelected"
                    @onfocusin="SearchFocus"
                    @onfocusout="SearchUnfocus"/>
            }
        </div>
        
        @if (_hasCreatePolicy && DisplayActions && _buttonToggles.ShowAddEntityButton) {
            <FluentButton OnClick="async () => { await CreateOrEdit(null); }">Add Entity</FluentButton>
        }

        @foreach (var button in _pluginButtons.Where(pb => pb.IsForTable(_config)).Where(pb => pb.Position == PluginButtonPosition.TopRight)) {
            <FluentButton
                IconStart="@(button.Icon?.GetInstance())"
                OnClick="() => button.Handler.Invoke(null!, _config!)">
                @button.Title
            </FluentButton>
        }
    </FluentToolbar>
    <FluentProgress Visible="_loading" Width="100%" />

    <div style="display: flex; overflow-y: auto; flex-grow: 1">
        <div style="flex-grow: 1">
            <FluentDataGrid Items="CurrentlyDisplayedModels.AsQueryable()">
                @if (DisplaySelection) {
                    <SelectColumn 
                        TGridItem="object"
                        SelectMode="SelectionMode"
                        SelectFromEntireRow="true"
                        OnSelect="data => SelectItem(data.Item, data.Selected)"
                        SelectAllDisabled="true"
                        Property="o => DialogData!.SelectedObjects.Contains(o)"
                        Style="min-width: max-content; height: 44px; display: grid; align-items: center" />
                }
                
                @foreach (var property in _config!.Properties.Where(prop => prop.List).OrderBy(prop => prop.Order)) {
                    <PropertyColumn
                        Title="@property.Name" Property="o => DisplayProperty(property, o).Result"
                        Style="min-width: max-content; height: 44px;"
                        Sortable="@property.Sortable"/>
                }

                @if (DisplayActions && (_hasDeletePolicy || _hasUpdatePolicy)) {
                    <TemplateColumn Title="Actions" Align="@Align.End" Style="min-height: 44px; min-width: max-content">
                        @foreach (var button in _pluginButtons.Where(pb => pb.IsForTable(_config)).Where(pb => pb.Position == PluginButtonPosition.OnEntry)) {
                            <FluentButton OnClick="() => button.Handler.Invoke(context, _config!)">
                                <FluentIcon Value="@(button.Icon!.GetInstance())" />
                            </FluentButton>
                        }
                        
                        @if (_hasUpdatePolicy && _buttonToggles.ShowEditButton) {
                            <FluentButton aria-label="Edit entry" OnClick="async () => { await CreateOrEdit(context); }">
                                <FluentIcon Value="@(new Icons.Regular.Size16.Edit())"/>
                            </FluentButton>
                        }

                        @if (_hasDeletePolicy && _buttonToggles.ShowDeleteButton) {
                            <FluentButton aria-label="Delete entry" OnClick="async () => { await DeleteEntry(context); }">
                                <FluentIcon Value="@(new Icons.Regular.Size16.Delete())" Color="Color.Warning"/>
                            </FluentButton>
                        }
                    </TemplateColumn>
                }
            </FluentDataGrid>
        </div>
    </div>

    @if (_totalPages > 1) {
        <div class="hopframe-paginator">
            <FluentButton BackgroundColor="transparent" OnClick="async () => await ChangePage(_currentPage - 1)">
                <FluentIcon Value="@(new Icons.Regular.Size20.ArrowPrevious())" Color="Color.Neutral" />
            </FluentButton>

            <span>Page</span>

            <FluentSelect TOption="int"
                          Items="Enumerable.Range(0, _totalPages)"
                          OptionValue="@(p => p.ToString())"
                          OptionText="@(p => (p + 1).ToString())"
                          ValueChanged="async s => await ChangePage(Convert.ToInt32(s))"
                          Width="max-content" SelectedOption="@_currentPage"/>

            <span>of @_totalPages</span>

            <FluentButton BackgroundColor="transparent" OnClick="async () => await ChangePage(_currentPage + 1)">
                <FluentIcon Value="@(new Icons.Regular.Size20.ArrowNext())" Color="Color.Neutral" />
            </FluentButton>
        </div>
    }
</div>

<script>
    function removeBg() {
        const elements = document.querySelectorAll(".col-sort-button");
        const style = new CSSStyleSheet();
        style.replaceSync(".control { background: none !important; }");
        elements.forEach(e => e?.shadowRoot?.adoptedStyleSheets?.push(style));
    }
    
    removeBg();

    window.downloadFileFromStream = async (fileName, contentStreamReference) => {
        const arrayBuffer = await contentStreamReference.arrayBuffer();
        const blob = new Blob([arrayBuffer]);
        const url = URL.createObjectURL(blob);
        const anchorElement = document.createElement('a');
        anchorElement.href = url;
        anchorElement.download = fileName ?? '';
        anchorElement.click();
        anchorElement.remove();
        URL.revokeObjectURL(url);
    }

    window.triggerClick = (elt) => elt.click();
</script>

<FluentToastProvider MaxToastCount="10" />

<InputFile style="display: none" @ref="FileInputElement" OnChange="OnInputFiles"></InputFile>

@inject IContextExplorer Explorer
@inject NavigationManager Navigator
@inject IJSRuntime Js
@inject IDialogService Dialogs
@inject IHopFrameAuthHandler Handler
@inject ICallbackEmitter Emitter
@inject IPluginOrchestrator PluginOrchestrator
@inject ISearchSuggestionProvider SearchSuggestions

@code {
    
    [Parameter]
    public required string TableDisplayName { get; set; }
    
    [Parameter]
    public bool DisplaySelection { get; set; }

    [Parameter]
    public bool DisplayActions { get; set; } = true;
    
    [Parameter]
    public RelationPickerDialogData? DialogData { get; set; }

    [Parameter]
    public DataGridSelectMode SelectionMode { get; set; } = DataGridSelectMode.Single;

    [Parameter]
    public int PerPage { get; set; } = 20;

    private TableConfig? _config;
    private ITableManager? _manager;

    public object[] CurrentlyDisplayedModels = [];
    private int _currentPage;
    private int _totalPages;
    private string? _searchTerm;
    private bool _loading;
    private bool _isSearchActive;
    private IList<string> _searchSuggestions = [];
    private FluentSearch? _searchBox;

    private bool _hasUpdatePolicy;
    private bool _hasDeletePolicy;
    private bool _hasCreatePolicy;

    private bool _allSelected;

    private readonly CancellationTokenSource _tokenSource = new();
    private List<PluginButton> _pluginButtons = new();
    private DefaultButtonToggles _buttonToggles = new();

    internal static HopFrameTablePage? CurrentInstance { get; private set; }

    protected override void OnInitialized() {
        CurrentInstance = this;
        _config ??= Explorer.GetTable(TableDisplayName);

        if (_config is null || (_config.Ignored && DialogData is null)) {
            Navigator.NavigateTo("/admin", true);
        }
    }

    protected override async Task OnInitializedAsync() {
        if (!await Handler.IsAuthenticatedAsync(_config?.ViewPolicy)) {
            Navigator.NavigateTo("/admin", true);
            return;
        }

        var eventResult = await PluginOrchestrator.DispatchEvent(new TableInitializedEvent(this) {
            Table = _config!
        });
        if (eventResult.IsCanceled) return;
        _pluginButtons = eventResult.PluginButtons;
        _buttonToggles = eventResult.DefaultButtons;

        _hasUpdatePolicy = await Handler.IsAuthenticatedAsync(_config?.UpdatePolicy);
        _hasDeletePolicy = await Handler.IsAuthenticatedAsync(_config?.DeletePolicy);
        _hasCreatePolicy = await Handler.IsAuthenticatedAsync(_config?.CreatePolicy);
        
        _manager ??= Explorer.GetTableManager(_config!.PropertyName);
        CurrentlyDisplayedModels = (await _manager!.LoadPage(_currentPage, PerPage)).ToArray();
        _totalPages = await _manager.TotalPages(PerPage);
    }

    protected override async Task OnAfterRenderAsync(bool firstRender) {
        try {
            await Js.InvokeVoidAsync("removeBg");
        }
        catch (Exception) {
            // ignored
        }
    }

    public void Dispose() {
        _searchCancel.Dispose();
        _tokenSource.Dispose();
    }

    private CancellationTokenSource _searchCancel = new();
    private async Task OnSearch(ChangeEventArgs eventArgs) {
        await _searchCancel.CancelAsync();
        _searchTerm = eventArgs.Value?.ToString();
        if (_searchTerm is null) return;
        _searchCancel = new();
        UpdateSearchSuggestions();
        
        await Task.Delay(500, _searchCancel.Token);

        var eventResult = await PluginOrchestrator.DispatchEvent(new SearchEvent(this) {
            SearchTerm = _searchTerm,
            Table = _config!,
            CurrentPage = _currentPage
        }, _tokenSource.Token);
        if (eventResult.IsCanceled) {
            if (eventResult.SearchResult is null) return;
            
            CurrentlyDisplayedModels = eventResult.SearchResult.ToArray();
            _totalPages = eventResult.TotalPages;
            return;
        }
        _searchTerm = eventResult.SearchTerm;
        
        await Reload();
    }
    
    private async Task SearchSuggestionSelected(string? suggestion) {
        if (string.IsNullOrWhiteSpace(suggestion)) return;
        _searchTerm = SearchSuggestions.CompleteSearchSuggestion(_config!, _searchTerm ?? string.Empty, suggestion);
        _searchBox!.Value = _searchTerm;
        _searchBox.FocusAsync();
        UpdateSearchSuggestions();

        if (!suggestion.EndsWith('='))
            await OnSearch(new() {
                Value = _searchTerm
            });
    }

    private void UpdateSearchSuggestions() {
        if (_config is null) return;
        _searchSuggestions = SearchSuggestions.GenerateSearchSuggestions(_config, _searchTerm ?? string.Empty).ToList();
    }

    private CancellationTokenSource _searchFocusCancel = new();
    private async Task SearchFocus() {
        _isSearchActive = true;
        await _searchFocusCancel.CancelAsync();
        _searchFocusCancel = new();
    }

    private async Task SearchUnfocus() {
        await Task.Delay(10, _searchFocusCancel.Token);
        _isSearchActive = false;
    }

    public async Task Reload() {
        _loading = true;

        var eventResult = await PluginOrchestrator.DispatchEvent(new ReloadEvent(this) {
            Table = _config!
        }, _tokenSource.Token);
        if (eventResult.IsCanceled) {
            _loading = false;
            return;
        }
        
        if (!string.IsNullOrEmpty(_searchTerm)) {
            (var query, _totalPages) = await _manager!.Search(_searchTerm, _currentPage, PerPage);
            CurrentlyDisplayedModels = query.ToArray();
        }
        else {
            await OnInitializedAsync();
        }
        _loading = false;
    }

    public async Task ChangePage(int page) {
        var eventResult = await PluginOrchestrator.DispatchEvent(new PageChangeEvent(this) {
            CurrentPage = _currentPage,
            NewPage = page,
            TotalPages = _totalPages,
            Table = _config!
        }, _tokenSource.Token);
        if (eventResult.IsCanceled) return;
        page = eventResult.NewPage;
        
        if (page < 0 || page > _totalPages - 1) return;
        _currentPage = page;
        await Reload();
    }

    private async Task DeleteEntry(object element) {
        if (!await Handler.IsAuthenticatedAsync(_config?.DeletePolicy)) {
            Navigator.NavigateTo("/admin", true);
            return;
        }

        var eventResult = await PluginOrchestrator.DispatchEvent(new DeleteEntryEvent(this) {
            Entity = element,
            Table = _config!
        }, _tokenSource.Token);
        if (eventResult.IsCanceled) return;
        
        var dialog = await Dialogs.ShowConfirmationAsync("Do you really want to delete this entry?");
        var result = await dialog.Result;
        if (result.Cancelled) return;

        await _manager!.DeleteItem(element);
        await Emitter.DispatchCallback(CallbackTypes.DeleteEntry(_config!), element);
        await Reload();
    }

    private async Task CreateOrEdit(object? element) {
        if (!await Handler.IsAuthenticatedAsync(element is null ? _config?.CreatePolicy : _config?.UpdatePolicy)) {
            Navigator.NavigateTo("/admin", true);
            return;
        }

        HopFrameTablePageEventArgs eventArgs;
        if (element is null) {
            eventArgs = new CreateEntryEvent(this) {
                Table = _config!
            };
        }
        else {
            eventArgs = new UpdateEntryEvent(this) {
                Table = _config!,
                Entity = element
            };
        }
        
        var eventResult = await PluginOrchestrator.DispatchEvent(eventArgs, _tokenSource.Token);
        if (eventResult.IsCanceled) return;
        
        var panel = await Dialogs.ShowPanelAsync<HopFrameEditor>(new EditorDialogData(_config!, element), new DialogParameters {
            TrapFocus = false
        });
        var result = await panel.Result;
        var data = result.Data as EditorDialogData;
        
        if (result.Cancelled) return;
        
        if (element is null) {
            await _manager!.AddItem(data!.CurrentObject!);
            await Emitter.DispatchCallback(CallbackTypes.CreateEntry(_config!), data.CurrentObject!);
        }
        else {
            await _manager!.EditItem(data!.CurrentObject!);
            await Emitter.DispatchCallback(CallbackTypes.UpdateEntry(_config!), data.CurrentObject!);
        }
        
        await Reload();
    }

    private void SelectItem(object item, bool selected) {
        var eventResult = PluginOrchestrator.DispatchEvent(new SelectEntryEvent(this) {
            Entity = item,
            Selected = selected,
            Table = _config!
        }, _tokenSource.Token).Result;
        if (eventResult.IsCanceled) return;
        selected = eventResult.Selected;
        
        if (!selected)
            DialogData!.SelectedObjects.Remove(item);
        else DialogData!.SelectedObjects.Add(item);
    }

    private void SelectAll() {
        var selected = CurrentlyDisplayedModels.All(DialogData!.SelectedObjects.Contains);
        foreach (var displayedModel in CurrentlyDisplayedModels) {
            SelectItem(displayedModel, !selected);
        }
        _allSelected = selected;
    }

    private async Task<string> DisplayProperty(PropertyConfig config, object entry) {
        var display = await _manager!.DisplayProperty(entry, config);

        if (display.Length > config.DisplayLength)
            display = display[..config.DisplayLength] + "...";

        return display;
    }
    
    public InputFile? FileInputElement;
    public Func<IEnumerable<IBrowserFile>, Task>? OnFileUpload;
    private async Task OnInputFiles(InputFileChangeEventArgs e) {
        if (OnFileUpload is null) return;
        
        if (e.FileCount == 1) {
            await OnFileUpload.Invoke([e.File]);
        }
        else {
            await OnFileUpload.Invoke(e.GetMultipleFiles());
        }
    }

    public void RequestRender() {
        StateHasChanged();
    }

}