using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Routing;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.AdminUI.Uns;
using ZB.MOM.WW.OtOpcUa.Configuration;
using ZB.MOM.WW.OtOpcUa.Security.Auth;

namespace ZB.MOM.WW.OtOpcUa.AdminUI.Tests.Raw;

/// <summary>
///     R04 P6: the CSV import grid renders through Virtualize from a precomputed view, and the export is
///     downloaded from an endpoint (bounded preview in the modal) instead of being embedded in the circuit.
/// </summary>
[Trait("Category", "Unit")]
public sealed class RawCsvRenderingTests
{
    private static RawCsvParseResult Result(params (int Row, bool Ok)[] rows) =>
        new(["Name"], rows.Select(r => new RawCsvReviewRow
        {
            RowNumber = r.Row, Name = $"t{r.Row}", Error = r.Ok ? null : "bad",
            ImportRow = r.Ok ? new RawTagImportRow(null, new RawTagInput($"t{r.Row}", "Int32", Configuration.Enums.TagAccessLevel.Read, false, null, "{}")) : null,
        }).ToList(), null);

    [Fact]
    public void Review_view_counts_and_filters_once_per_change()
    {
        var view = new RawCsvReviewView();
        view.Set(Result((1, true), (2, false), (3, true)));

        view.OkCount.ShouldBe(2);
        view.ErrorCount.ShouldBe(1);
        view.RemainingCount.ShouldBe(3);

        view.Remove(2);
        view.ErrorCount.ShouldBe(0);
        view.VisibleRows.Select(r => r.RowNumber).ShouldBe([1, 3]);
        view.CommitRows().Select(r => r.Tag.Name).ShouldBe(["t1", "t3"]);

        view.Set(null);
        view.RemainingCount.ShouldBe(0);
        // Positive control: a fresh set after a clear shows every row again (removals are forgotten).
        view.Set(Result((1, true), (2, false)));
        view.RemainingCount.ShouldBe(2);
    }

    [Fact]
    public void Preview_is_bounded_and_flags_truncation()
    {
        var csv = string.Concat(Enumerable.Range(0, 200).Select(i => $"row{i}\n"));

        var (preview, truncated) = RawTagCsvExport.Preview(csv, maxLines: 50);
        truncated.ShouldBeTrue();
        preview.Split('\n', StringSplitOptions.RemoveEmptyEntries).Length.ShouldBe(50);

        var (all, cut) = RawTagCsvExport.Preview("a\nb\n", maxLines: 50);
        cut.ShouldBeFalse();
        all.ShouldBe("a\nb\n");
    }

    [Fact]
    public async Task Preview_build_maps_only_the_first_rows_but_counts_all()
    {
        // Review r0 M8: the modal maps only its preview's rows; the full count still comes back.
        var dbName = Uns.RawTreeTestDb.SeedFresh();
        var reader = new RawTagCsvExportReader(Uns.RawTreeTestDb.Factory(dbName));

        var full = await RawTagCsvExport.BuildAsync(reader, Uns.RawTreeTestDb.FolderedDeviceId, null, "Modbus", TestContext.Current.CancellationToken);
        var preview = await RawTagCsvExport.BuildAsync(reader, Uns.RawTreeTestDb.FolderedDeviceId, null, "Modbus", ct: TestContext.Current.CancellationToken, maxRows: 1);

        full!.RowCount.ShouldBe(2);
        Commons.Csv.CsvParser.Parse(full.Csv).Count.ShouldBe(3);     // header + 2 (positive control)
        preview!.RowCount.ShouldBe(2);
        Commons.Csv.CsvParser.Parse(preview.Csv).Count.ShouldBe(2);  // header + 1
    }

    [Fact]
    public void Attachment_header_carries_an_rfc5987_name_for_non_ascii_ids()
    {
        var header = RawTagCsvExport.AttachmentHeader(RawTagCsvExport.BuildFileName("Prüfstand"));

        header.ShouldStartWith("attachment");
        header.ShouldContain("filename*=UTF-8''tags-Pr%C3%BCfstand.csv");
        // Positive control: an ASCII name is still a plain filename.
        RawTagCsvExport.AttachmentHeader("tags-dev1.csv").ShouldContain("filename=tags-dev1.csv");
    }

    [Fact]
    public void Download_url_escapes_its_query_values()
    {
        RawTagCsvExport.DownloadUrl("dev 1&x", null, "Modbus")
            .ShouldBe("/api/raw/tags.csv?deviceId=dev%201%26x&driverType=Modbus");
        RawTagCsvExport.DownloadUrl("", "TG/1", null).ShouldBe("/api/raw/tags.csv?tagGroupId=TG%2F1");
    }

    [Fact]
    public void Download_endpoint_requires_the_same_ConfigEditor_policy_as_the_raw_page()
    {
        var builder = WebApplication.CreateBuilder();
        builder.Services.AddDbContextFactory<OtOpcUaConfigDbContext>(o => o.UseInMemoryDatabase("csv-export-metadata"));
        builder.Services.AddScoped<RawTagCsvExportReader>();
        var app = builder.Build();
        app.MapRawTagCsvExport();

        var endpoint = ((IEndpointRouteBuilder)app).DataSources.SelectMany(d => d.Endpoints).OfType<RouteEndpoint>()
            .Single(e => e.RoutePattern.RawText == RawTagCsvExport.DownloadPath);

        endpoint.Metadata.GetMetadata<IAllowAnonymous>().ShouldBeNull();
        endpoint.Metadata.GetOrderedMetadata<IAuthorizeData>().Select(a => a.Policy)
            .ShouldContain(AdminUiPolicies.ConfigEditor);
        // Parity with the page that links to it.
        typeof(ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Raw.GlobalRaw)
            .GetCustomAttributes(typeof(AuthorizeAttribute), false).Cast<AuthorizeAttribute>()
            .Single().Policy.ShouldBe(AdminUiPolicies.ConfigEditor);
    }

    [Fact]
    public void Modals_no_longer_embed_the_csv_or_render_every_row()
    {
        var export = AdminUiSource.Read("Components", "Shared", "Raw", "RawCsvExportModal.razor");
        export.ShouldNotContain("data:text/csv");
        export.ShouldContain("RawTagCsvExport.Preview(");

        var import = AdminUiSource.Read("Components", "Shared", "Raw", "RawCsvImportModal.razor");
        import.ShouldContain("<Virtualize Items=\"@_view.VisibleRows\"");
        import.ShouldNotContain("@foreach (var row in _result.Rows)");

        AdminUiSource.Read("EndpointRouteBuilderExtensions.cs").ShouldContain("app.MapRawTagCsvExport();");
    }
}