using Bunit;
using ZB.MOM.WW.ScadaBridge.CentralUI.Components.Shared;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Debugging;

namespace ZB.MOM.WW.ScadaBridge.CentralUI.Tests.Shared;

/// <summary>Tests for <see cref="FlowTraceList"/> (Flow Debugger vertical trace list, Gitea #53).</summary>
public class FlowTraceListTests : BunitContext
{
    private static readonly DateTimeOffset T0 = new(2026, 11, 9, 12, 0, 0, TimeSpan.Zero);

    private static FlowStep Step(FlowStepKind kind, FlowLane lane, string title, int offsetMs,
        FlowStepOutcome outcome = FlowStepOutcome.Ok, int? durationMs = 5, IReadOnlyList<FlowLogLine>? logs = null) =>
        new(Guid.NewGuid(), null, null, kind, lane, title, null, T0.AddMilliseconds(offsetMs), durationMs, outcome,
            null, null, null, null, null, null, null, null, Logs: logs);

    private static FlowGraph Graph(params FlowStep[] steps) =>
        new(steps, Array.Empty<FlowEdge>(), Predicted: false, Truncated: false);

    private static FlowGraph Sample() => Graph(
        Step(FlowStepKind.InboundRequest, FlowLane.Central, "POST /api/M", 0),
        Step(FlowStepKind.ScriptRun, FlowLane.Site, "RunIt", 20, FlowStepOutcome.Failed, 80),
        Step(FlowStepKind.AttributeWrite, FlowLane.Tags, "Inst.Flag", 30));

    /// <summary>Every step renders as a row in display order with its lane and offset.</summary>
    [Fact]
    public void Render_ListsStepsInOrderWithLaneColumn()
    {
        var cut = Render<FlowTraceList>(p => p.Add(c => c.Graph, Sample()));

        var rows = cut.FindAll("[data-test='flow-list-row']");
        Assert.Equal(3, rows.Count);
        Assert.Equal(new[] { "Central", "Site", "Tags" }, rows.Select(r => r.GetAttribute("data-lane")));
        Assert.Contains("+20 ms", rows[1].TextContent);
        Assert.Contains("RunIt", rows[1].TextContent);
        Assert.Contains("Failed", rows[1].TextContent);
        Assert.Contains("failed", rows[1].ClassList);
    }

    /// <summary>The lane filter narrows the rows and the count line.</summary>
    [Fact]
    public void LaneFilter_NarrowsRows()
    {
        var cut = Render<FlowTraceList>(p => p.Add(c => c.Graph, Sample()));

        cut.Find("[data-test='flow-list-lane-filter']").Change("Site");

        var row = Assert.Single(cut.FindAll("[data-test='flow-list-row']"));
        Assert.Equal("Site", row.GetAttribute("data-lane"));
        Assert.Contains("1 of 3", cut.Find("[data-test='flow-list-count']").TextContent);
    }

    /// <summary>The failures-only toggle keeps failed and timed-out steps.</summary>
    [Fact]
    public void FailuresOnly_KeepsFailedSteps()
    {
        var cut = Render<FlowTraceList>(p => p.Add(c => c.Graph, Sample()));

        cut.Find("[data-test='flow-list-failed-only']").Change(true);

        var row = Assert.Single(cut.FindAll("[data-test='flow-list-row']"));
        Assert.Equal("ScriptRun", row.GetAttribute("data-kind"));
    }

    /// <summary>Clicking or pressing Enter on a row raises OnSelect; the selected row is marked.</summary>
    [Fact]
    public void ClickAndEnter_RaiseSelect_AndSelectedRowIsMarked()
    {
        var graph = Sample();
        var picked = new List<FlowStep>();
        var cut = Render<FlowTraceList>(p => p
            .Add(c => c.Graph, graph)
            .Add(c => c.SelectedEventId, graph.Steps[2].EventId)
            .Add(c => c.OnSelect, s => picked.Add(s)));

        cut.FindAll("[data-test='flow-list-row']")[1].Click();
        cut.FindAll("[data-test='flow-list-row']")[0].KeyDown(new Microsoft.AspNetCore.Components.Web.KeyboardEventArgs { Key = "Enter" });

        Assert.Equal(new[] { FlowStepKind.ScriptRun, FlowStepKind.InboundRequest }, picked.Select(s => s.Kind));
        var rows = cut.FindAll("[data-test='flow-list-row']");
        Assert.Equal("true", rows[2].GetAttribute("aria-selected"));
        Assert.Contains("selected", rows[2].ClassList);
    }

    /// <summary>No graph shows the empty note; log lines show a count.</summary>
    [Fact]
    public void EmptyGraph_ShowsNoSteps_AndLogsAreCounted()
    {
        Assert.NotNull(Render<FlowTraceList>().Find("[data-test='flow-list-empty']"));

        var logs = new[] { new FlowLogLine(Guid.NewGuid(), null, T0, "error", "script", "boom", null, null, null, 1) };
        var cut = Render<FlowTraceList>(p => p.Add(c => c.Graph,
            Graph(Step(FlowStepKind.ScriptRun, FlowLane.Site, "S", 0, logs: logs))));
        Assert.Equal("1", cut.Find("[data-test='flow-list-logs']").TextContent.Trim());
    }
}