using Bunit;
using Microsoft.Extensions.DependencyInjection;
using ZB.MOM.WW.ScadaBridge.CentralUI.Components.Shared;

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

/// <summary>
/// Deferred-work register row 75 — pins the confirm button's severity → Bootstrap class
/// mapping against the REAL <see cref="DialogService"/> behind a real <c>DialogHost</c>,
/// so these cover what the user actually sees rather than what an argument was.
///
/// <para>
/// Row 28 split the label from the styling but left the styling a two-state boolean, so a
/// consequential-but-not-destructive action had to choose between looking like a delete
/// and looking like the safe default. Row 75 added <see cref="DialogSeverity.Caution"/> as
/// the middle rung. The three-way mapping is the whole of that change, and these are its
/// pins; <c>SecuredWritesTests</c> separately pins that the Secured Writes page asks for
/// the right one.
/// </para>
///
/// <para>
/// bUnit cannot run real JS interop, so the host's <c>sbDialog.*</c> focus-trap calls run
/// in <see cref="JSRuntimeMode.Loose"/> as no-ops (same arrangement as
/// <c>FailoverConfirmLabelTests</c>).
/// </para>
/// </summary>
public class DialogSeverityStylingTests : BunitContext
{
    private readonly DialogService _dialog = new();

    public DialogSeverityStylingTests()
    {
        Services.AddSingleton<IDialogService>(_dialog);
        JSInterop.Mode = JSRuntimeMode.Loose;
    }

    /// <summary>
    /// Opens a confirm dialog on a live host and returns its confirm button.
    /// </summary>
    /// <remarks>
    /// The <c>ConfirmAsync</c> task is deliberately not awaited — with the real service it
    /// does not complete until someone answers the dialog, so awaiting it would deadlock
    /// the test. The state is published synchronously before the task is returned.
    /// </remarks>
    private AngleSharp.Dom.IElement OpenConfirm(Func<IDialogService, Task<bool>> open)
    {
        var cut = Render<DialogHost>();
        cut.InvokeAsync(() => { _ = open(_dialog); }).GetAwaiter().GetResult();
        cut.Render();

        var footer = cut.FindAll("div.modal-footer button").ToList();
        return footer.Single(b => b.TextContent.Trim() != "Cancel");
    }

    [Fact]
    public void Caution_rendersAmber_notRedAndNotPrimary()
    {
        // The row-75 case. Amber is the point: not red (which reads "delete"), and not
        // the primary blue (which reads "safe default" — wrong for a live device write).
        var confirm = OpenConfirm(d => d.ConfirmAsync("Approve thing", "Sure?", DialogSeverity.Caution, "Approve"));

        Assert.Contains("btn-warning", confirm.ClassList);
        Assert.DoesNotContain("btn-danger", confirm.ClassList);
        Assert.DoesNotContain("btn-primary", confirm.ClassList);
    }

    [Fact]
    public void Destructive_stillRendersRed()
    {
        // Regression guard on the ~20 genuine delete call sites: row 75 is additive and
        // must not have shifted what danger looks like.
        var confirm = OpenConfirm(d => d.ConfirmAsync("Delete thing", "Sure?", DialogSeverity.Destructive));

        Assert.Contains("btn-danger", confirm.ClassList);
    }

    [Fact]
    public void Normal_stillRendersPrimary()
    {
        var confirm = OpenConfirm(d => d.ConfirmAsync("Do thing", "Sure?", DialogSeverity.Normal));

        Assert.Contains("btn-primary", confirm.ClassList);
    }

    [Theory]
    [InlineData(true, "btn-danger")]
    [InlineData(false, "btn-primary")]
    public void BooleanForm_mapsOntoTheSameTwoSeverities(bool danger, string expectedClass)
    {
        // The boolean overload is now a thin adapter onto the severity one. Every existing
        // call site goes through it, so this pins that the adapter did not shift any of
        // them: true is still red, false is still primary.
        //
        // One case per fact, deliberately: DialogService permits only one open dialog at a
        // time and throws on the second, so two OpenConfirm calls in one body would fail
        // on the service's own nested-dialog guard rather than on anything about styling.
        var confirm = OpenConfirm(d => d.ConfirmAsync("Do thing", "Sure?", danger: danger));

        Assert.Contains(expectedClass, confirm.ClassList);
    }

    [Fact]
    public void UnlabelledCaution_readsConfirm_notDelete()
    {
        // Caution deliberately does NOT inherit the danger "Delete" fallback: a caution
        // action is by definition not a delete, so falling back to that verb would
        // reintroduce register row 28 through the new door.
        var confirm = OpenConfirm(d => d.ConfirmAsync("Approve thing", "Sure?", DialogSeverity.Caution));

        Assert.Equal("Confirm", confirm.TextContent.Trim());
    }

    [Fact]
    public void UnlabelledDestructive_stillFallsBackToDelete()
    {
        // The row-28 fallback is retained deliberately (the Playwright suites click the
        // literal "Delete"). Pinned here alongside its new sibling so the pair is read
        // together.
        var confirm = OpenConfirm(d => d.ConfirmAsync("Delete thing", "Sure?", DialogSeverity.Destructive));

        Assert.Equal("Delete", confirm.TextContent.Trim());
    }
}