@using AntDesign.TableModels
@using LANCommander.Server.ImportExport.Factories
@using LANCommander.Server.Services.Providers.Metadata
@inject MetadataService MetadataService
@inject GameService GameService
@inject ImportContextFactory ImportContextFactory
@inject IMessageService MessageService
@inject ILogger<MetadataLookupPanel> Logger

<Spin Spinning="_importing" Tip="@_importStatus">

<Flex Gap="FlexGap.Small" Style="margin-bottom: 12px;">
    <Input @bind-Value="Search" BindOnInput="true" OnkeyDown="SearchFieldOnKeyDown" AutoFocus="AutoFocus" />
    <Button OnClick="() => SearchForGame(Search)" Type="ButtonType.Primary" Disabled="@(String.IsNullOrWhiteSpace(Search) || !_availableProviders.Any())">Search</Button>
</Flex>

@if (_stage == ModalStage.Search)
{
    @if (_errorMessage != null)
    {
        <Result Status="ResultStatus.Error" Title="Search Failed" SubTitle="@_errorMessage">
            <Extra>
                <Button OnClick="DismissError">Dismiss</Button>
            </Extra>
        </Result>
    }
    else if (_hasSearched)
    {
        <Table
            @ref="ResultsTable"
            TItem="MetadataSearchResult<SDK.Models.Manifest.Game>"
            DataSource="@(_results?.Results ?? [])"
            HidePagination="true"
            Loading="_loading"
            OnRowClick="OnRowClicked"
            @bind-SelectedRows="SelectedResults"
            Responsive>

            <Selection Key="@context.Id" Type="SelectionType.Radio"/>
            <PropertyColumn Property="g => g.Data.Title" Title="Title"/>
            <PropertyColumn Property="g => g.Data.ReleasedOn" Title="Released">
                @(context.Data.ReleasedOn != default ? context.Data.ReleasedOn.ToString("MM/dd/yyyy") : "—")
            </PropertyColumn>
            <PropertyColumn Property="g => g.Data.Platforms" Title="Platforms">
                @string.Join(", ", context.Data.Platforms?.Select(p => p.Name) ?? [])
            </PropertyColumn>
            <PropertyColumn Property="g => g.Data.Developers" Title="Developers">
                @string.Join(", ", context.Data.Developers?.Select(d => d.Name) ?? [])
            </PropertyColumn>
        </Table>

        @if (_results?.More ?? false)
        {
            <Button Type="ButtonType.Primary" OnClick="ShowMore" Block>Show More</Button>
        }
    }

    <Flex Gap="FlexGap.Small" Justify="FlexJustify.End" Style="margin-top: 12px;">
        <Select Value="_selectedProvider" ValueChanged="OnProviderChanged" DataSource="_availableProviders" TItem="string" TItemValue="string"/>
        @if (_availableSubProviders?.Any() == true)
        {
            <Select Value="_selectedSubProvider" ValueChanged="OnSubProviderChanged" TItem="string" TItemValue="string">
                @foreach (var sp in _availableSubProviders)
                {
                    <SelectOption Value="@sp.Slug" Label="@sp.Name" TItemValue="string" TItem="string" />
                }
            </Select>
        }
        @if (ShowCancel)
        {
            <Button OnClick="HandleCancel" Style="margin-left: 0;">Cancel</Button>
        }
    </Flex>

    @ChildContent
}
else if (_stage == ModalStage.Merge)
{
    @if (_errorMessage != null)
    {
        <Result Status="ResultStatus.Error" Title="Import Failed" SubTitle="@_errorMessage">
            <Extra>
                <Button OnClick="DismissError">Dismiss</Button>
            </Extra>
        </Result>
    }
    else
    {
        <div class="ant-table">
            <div class="ant-table-container">
                <div class="ant-table-content">
                    <table class="metadata-merge-table">
                        <thead class="ant-table-thead">
                            <tr>
                                <th>Import</th>
                                <th>Field</th>
                                <th>Value</th>
                            </tr>
                        </thead>
                        <tbody class="ant-table-tbody">
                            <tr class="ant-table-row">
                                <td class="ant-table-cell"><Checkbox @bind-Checked="_importTitle" /></td>
                                <td class="ant-table-cell">Title</td>
                                <td class="ant-table-cell">@_fetchedManifest?.Title</td>
                            </tr>
                            <tr class="ant-table-row">
                                <td class="ant-table-cell"><Checkbox @bind-Checked="_importDescription" /></td>
                                <td class="ant-table-cell">Description</td>
                                <td class="ant-table-cell"><span class="metadata-merge-truncate">@_fetchedManifest?.Description</span></td>
                            </tr>
                            <tr class="ant-table-row">
                                <td class="ant-table-cell"><Checkbox @bind-Checked="_importReleasedOn" /></td>
                                <td class="ant-table-cell">Released On</td>
                                <td class="ant-table-cell">@(_fetchedManifest?.ReleasedOn.ToString("MM/dd/yyyy"))</td>
                            </tr>
                            <tr class="ant-table-row">
                                <td class="ant-table-cell"><Checkbox @bind-Checked="_importSingleplayer" /></td>
                                <td class="ant-table-cell">Singleplayer</td>
                                <td class="ant-table-cell">@(_fetchedManifest?.Singleplayer == true ? "Yes" : "No")</td>
                            </tr>
                            <tr class="ant-table-row">
                                <td class="ant-table-cell"><Checkbox @bind-Checked="_importEngine" /></td>
                                <td class="ant-table-cell">Engine</td>
                                <td class="ant-table-cell">@(_fetchedManifest?.Engine?.Name ?? "—")</td>
                            </tr>
                            <tr class="ant-table-row">
                                <td class="ant-table-cell"><Checkbox @bind-Checked="_importDevelopers" /></td>
                                <td class="ant-table-cell">Developers</td>
                                <td class="ant-table-cell">
                                    @foreach (var item in _fetchedManifest?.Developers ?? [])
                                    {
                                        <Tag>@item.Name</Tag>
                                    }
                                </td>
                            </tr>
                            <tr class="ant-table-row">
                                <td class="ant-table-cell"><Checkbox @bind-Checked="_importPublishers" /></td>
                                <td class="ant-table-cell">Publishers</td>
                                <td class="ant-table-cell">
                                    @foreach (var item in _fetchedManifest?.Publishers ?? [])
                                    {
                                        <Tag>@item.Name</Tag>
                                    }
                                </td>
                            </tr>
                            <tr class="ant-table-row">
                                <td class="ant-table-cell"><Checkbox @bind-Checked="_importGenres" /></td>
                                <td class="ant-table-cell">Genres</td>
                                <td class="ant-table-cell">
                                    @foreach (var item in _fetchedManifest?.Genres ?? [])
                                    {
                                        <Tag>@item.Name</Tag>
                                    }
                                </td>
                            </tr>
                            <tr class="ant-table-row">
                                <td class="ant-table-cell"><Checkbox @bind-Checked="_importTags" /></td>
                                <td class="ant-table-cell">Tags</td>
                                <td class="ant-table-cell">
                                    @foreach (var item in _fetchedManifest?.Tags ?? [])
                                    {
                                        <Tag>@item.Name</Tag>
                                    }
                                </td>
                            </tr>
                            <tr class="ant-table-row">
                                <td class="ant-table-cell"><Checkbox @bind-Checked="_importMultiplayerModes" /></td>
                                <td class="ant-table-cell">Multiplayer Modes</td>
                                <td class="ant-table-cell">@(_fetchedManifest?.MultiplayerModes?.Count ?? 0) mode(s)</td>
                            </tr>
                            <tr class="ant-table-row">
                                <td class="ant-table-cell"><Checkbox @bind-Checked="_importSavePaths" /></td>
                                <td class="ant-table-cell">Save Paths</td>
                                <td class="ant-table-cell">@(_fetchedManifest?.SavePaths?.Count ?? 0) path(s)</td>
                            </tr>
                            <tr class="ant-table-row">
                                <td class="ant-table-cell"><Checkbox @bind-Checked="_importExternalIds" /></td>
                                <td class="ant-table-cell">External IDs</td>
                                <td class="ant-table-cell">
                                    @foreach (var item in _fetchedManifest?.ExternalIds ?? [])
                                    {
                                        <Tag>@item.Provider: @item.ExternalId</Tag>
                                    }
                                </td>
                            </tr>
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    }

    <Flex Gap="FlexGap.Small" Justify="FlexJustify.End" Style="margin-top: 12px;">
        <Button OnClick="ImportWithMerge" Loading="_loading" Type="ButtonType.Primary">Import</Button>
        <Button OnClick="BackToSearch" Disabled="_loading">Back</Button>
        @if (ShowCancel)
        {
            <Button OnClick="HandleCancel" Disabled="_loading">Cancel</Button>
        }
    </Flex>
}

</Spin>

@code {
    private enum ModalStage { Search, Merge }

    [Parameter] public Guid GameId { get; set; }
    [Parameter] public EventCallback<Guid> OnImported { get; set; }
    [Parameter] public EventCallback OnCancel { get; set; }
    [Parameter] public bool AutoFocus { get; set; }
    [Parameter] public bool ShowCancel { get; set; } = true;
    [Parameter] public string Search { get; set; } = string.Empty;
    [Parameter] public EventCallback<string> SearchChanged { get; set; }
    [Parameter] public RenderFragment ChildContent { get; set; }

    ITable? ResultsTable;

    MetadataSearchResultsCollection<SDK.Models.Manifest.Game>? _results;

    IEnumerable<MetadataSearchResult<SDK.Models.Manifest.Game>> SelectedResults { get; set; }
    bool _loading = false;
    bool _hasSearched = false;
    int _limit = 10;
    int _offset = 0;

    string _selectedProvider = string.Empty;
    IEnumerable<string> _availableProviders = [];

    string? _selectedSubProvider;
    IEnumerable<(string Slug, string Name)>? _availableSubProviders;

    ModalStage _stage = ModalStage.Search;
    string? _errorMessage = null;
    LANCommander.SDK.Models.Manifest.Game? _fetchedManifest = null;

    bool _importing = false;
    string _importStatus = "Importing...";

    bool _importTitle = true;
    bool _importDescription = true;
    bool _importReleasedOn = true;
    bool _importSingleplayer = true;
    bool _importEngine = true;
    bool _importDevelopers = true;
    bool _importPublishers = true;
    bool _importGenres = true;
    bool _importTags = true;
    bool _importMultiplayerModes = true;
    bool _importSavePaths = true;
    bool _importExternalIds = true;

    protected override async Task OnInitializedAsync()
    {
        _availableProviders = MetadataService.GetProviderNames();
        _selectedProvider = _availableProviders.FirstOrDefault() ?? string.Empty;
        await UpdateSubProvidersAsync();
    }

    private async Task OnProviderChanged(string provider)
    {
        _selectedProvider = provider;
        _errorMessage = null;
        await UpdateSubProvidersAsync();

        if (!string.IsNullOrWhiteSpace(Search))
            await SearchForGame(Search);
    }

    private async Task OnSubProviderChanged(string subProvider)
    {
        _selectedSubProvider = subProvider;
        _errorMessage = null;

        if (!string.IsNullOrWhiteSpace(Search))
            await SearchForGame(Search);
    }

    private async Task UpdateSubProvidersAsync()
    {
        var provider = MetadataService.GetProvider(_selectedProvider);

        if (provider is not null)
        {
            _availableSubProviders = await provider.GetSubProvidersAsync();
            _selectedSubProvider = _availableSubProviders?.FirstOrDefault().Slug;
        }
        else
        {
            _availableSubProviders = null;
            _selectedSubProvider = null;
        }
    }

    private async Task OnRowClicked(RowData<MetadataSearchResult<SDK.Models.Manifest.Game>> row)
    {
        ResultsTable?.SetSelection([row.Data.Id]);
        await BeginMerge();
    }

    private async Task SearchFieldOnKeyDown(KeyboardEventArgs e)
    {
        if ((e.Code == "Enter" || e.Code == "NumpadEnter") && !String.IsNullOrWhiteSpace(Search))
            await SearchForGame(Search);
    }

    private async Task SearchForGame(string title, bool newSearch = true)
    {
        var provider = MetadataService.GetProvider(_selectedProvider);

        if (provider is null)
        {
            MessageService.Error($"Provider \"{_selectedProvider}\" is not available");
            return;
        }

        try
        {
            _loading = true;
            _hasSearched = true;
            _errorMessage = null;

            if (newSearch)
            {
                _results = null;
                _offset = 0;
            }

            _results = _availableSubProviders?.Any() == true
                ? await provider.SearchGamesAsync(title, _selectedSubProvider, _limit, _offset)
                : await provider.SearchGamesAsync(title, _limit, _offset);

            _loading = false;
        }
        catch (Exception ex)
        {
            Logger.LogError(ex, "An error occurred searching {Provider}", _selectedProvider);

            _loading = false;
            _errorMessage = ex.Message;
        }
    }

    private async Task BeginMerge()
    {
        var provider = MetadataService.GetProvider(_selectedProvider);

        if (provider is null)
            return;

        _loading = true;
        _errorMessage = null;

        try
        {
            var selected = SelectedResults.First();

            var manifest = await provider.GetGameAsync(selected.Id);

            if (manifest is null)
            {
                _errorMessage = "Could not retrieve game metadata from the provider.";
                _loading = false;
                return;
            }

            _fetchedManifest = manifest;

            _importTitle = true;
            _importDescription = !string.IsNullOrWhiteSpace(manifest.Description);
            _importReleasedOn = manifest.ReleasedOn != default;
            _importSingleplayer = true;
            _importEngine = manifest.Engine != null;
            _importDevelopers = manifest.Developers?.Any() == true;
            _importPublishers = manifest.Publishers?.Any() == true;
            _importGenres = manifest.Genres?.Any() == true;
            _importTags = manifest.Tags?.Any() == true;
            _importMultiplayerModes = manifest.MultiplayerModes?.Any() == true;
            _importSavePaths = manifest.SavePaths?.Any() == true;
            _importExternalIds = manifest.ExternalIds?.Any() == true;

            _stage = ModalStage.Merge;
        }
        catch (Exception ex)
        {
            Logger.LogError(ex, "An error occurred fetching metadata from {Provider}", _selectedProvider);
            _errorMessage = ex.Message;
        }
        finally
        {
            _loading = false;
        }
    }

    private async Task ImportWithMerge()
    {
        if (_fetchedManifest is null)
            return;

        _loading = true;
        _importing = true;
        _importStatus = "Importing...";
        _errorMessage = null;

        try
        {
            LANCommander.SDK.Models.Manifest.Game? existing = null;

            if (GameId != Guid.Empty)
                existing = await GameService.GetManifestAsync(GameId);

            var manifest = _fetchedManifest;
            manifest.Id = GameId == Guid.Empty ? Guid.NewGuid() : GameId;

            if (!_importTitle && existing != null)
                manifest.Title = existing.Title;

            if (!_importDescription && existing != null)
                manifest.Description = existing.Description;

            if (!_importReleasedOn && existing != null)
                manifest.ReleasedOn = existing.ReleasedOn;

            if (!_importSingleplayer && existing != null)
                manifest.Singleplayer = existing.Singleplayer;

            if (!_importEngine)
                manifest.Engine = existing?.Engine;

            if (!_importDevelopers)
                manifest.Developers = existing?.Developers ?? new List<LANCommander.SDK.Models.Manifest.Company>();

            if (!_importPublishers)
                manifest.Publishers = existing?.Publishers ?? new List<LANCommander.SDK.Models.Manifest.Company>();

            if (!_importGenres)
                manifest.Genres = existing?.Genres ?? new List<LANCommander.SDK.Models.Manifest.Genre>();

            if (!_importTags)
                manifest.Tags = existing?.Tags ?? new List<LANCommander.SDK.Models.Manifest.Tag>();

            if (!_importMultiplayerModes)
                manifest.MultiplayerModes = existing?.MultiplayerModes ?? new List<LANCommander.SDK.Models.Manifest.MultiplayerMode>();

            if (!_importSavePaths)
                manifest.SavePaths = existing?.SavePaths ?? new List<LANCommander.SDK.Models.Manifest.SavePath>();

            if (!_importExternalIds)
                manifest.ExternalIds = existing?.ExternalIds ?? new List<LANCommander.SDK.Models.Manifest.GameExternalId>();

            using var context = ImportContextFactory.Create();
            await context.InitializeMetadataUpdateAsync(manifest);
            await context.ImportQueueAsync();

            _loading = false;

            await OnImported.InvokeAsync(manifest.Id);

            _importing = false;
            Reset();
        }
        catch (Exception ex)
        {
            Logger.LogError(ex, "An error occurred importing metadata from {Provider}", _selectedProvider);
            _errorMessage = ex.Message;
            _loading = false;
            _importing = false;
        }
    }

    public async Task UpdateStatusAsync(string status)
    {
        _importStatus = status;
        await InvokeAsync(StateHasChanged);
    }

    private void BackToSearch()
    {
        _stage = ModalStage.Search;
        _errorMessage = null;
        _fetchedManifest = null;
        SelectedResults = [];
    }

    private void DismissError()
    {
        _errorMessage = null;
    }

    private void Reset()
    {
        _results = null;
        _limit = 10;
        _offset = 0;
        _hasSearched = false;
        _stage = ModalStage.Search;
        _errorMessage = null;
        _fetchedManifest = null;
    }

    private async Task HandleCancel()
    {
        Reset();
        await OnCancel.InvokeAsync();
    }

    private async Task ShowMore()
    {
        _offset += _results?.Limit ?? _limit;

        await SearchForGame(Search, false);
    }
}