using Microsoft.Playwright;
using ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests.Cluster;
using Xunit;

namespace ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests.Deployment;

/// <summary>
/// E2E coverage for the Topology page's area authoring surface — creating an area
/// from the toolbar "+ Area" dialog (the site-picker variant), and the inline
/// double-click rename on an area node's label.
///
/// <para>
/// Every fact opens the page through <see cref="OpenStableTopologyAsync"/>, which
/// FIRST unchecks the <c>#live-updates</c> switch. The page reloads the whole tree
/// on a 15s timer; left on, that reload collapses freshly-expanded nodes and tears
/// down any open dialog or in-progress rename input mid-interaction. With it off
/// the tree stays stable for the duration of the action. The helper then clicks
/// <c>Expand all areas</c> so nested area nodes are rendered and locatable.
/// </para>
///
/// <para>
/// Toolbar create: "+ Area" opens <c>CreateAreaDialog</c> in its site-picker mode,
/// where the FIRST <c>&lt;select&gt;</c> is the Site picker (option value = site id)
/// and the second is the parent area. Success closes the dialog, raises an
/// "Area '…' created." toast, and renders the new node.
/// </para>
///
/// <para>
/// Inline rename: double-clicking an area's <c>span.tv-label</c> swaps it for a
/// rename input. <b>Enter commits, Escape reverts, and blur CANCELS</b> — so a
/// committing fact fills the input then presses Enter on that SAME input, never
/// clicking elsewhere first (a click would blur and silently discard the edit).
/// </para>
///
/// <para>
/// Areas these tests create/rename are ephemeral and cleaned up in a
/// <c>finally</c>: the rename facts create their own area over the CLI (known id →
/// delete by id), while the toolbar-create fact never learns the new id from the
/// UI, so it sweeps by name prefix
/// (<see cref="CliRunner.ListAreaIdsByNamePrefixAsync"/> →
/// <see cref="CliRunner.DeleteAreaAsync"/>). A CLI read-back after each action
/// confirms the change actually persisted, not just that the toast appeared.
/// </para>
/// </summary>
[Collection("Playwright")]
public class TopologyAreaTests : IClassFixture<DeploymentFixture>
{
    private readonly PlaywrightFixture _pw;
    private readonly DeploymentFixture _cluster;

    public TopologyAreaTests(PlaywrightFixture pw, DeploymentFixture cluster)
    {
        _pw = pw;
        _cluster = cluster;
    }

    [SkippableFact]
    public async Task CreateArea_ViaToolbar_AppearsInTreeAndPersists()
    {
        Skip.IfNot(_cluster.Available, ClusterAvailability.SkipReason);

        var areaName = CliRunner.UniqueName("topoarea");
        try
        {
            var page = await OpenStableTopologyAsync(_pw);

            await page.Locator("button:has-text('+ Area')").ClickAsync();
            var dialog = page.Locator(".modal.show:has(h6.modal-title:has-text('New Area'))");
            await Assertions.Expect(dialog).ToBeVisibleAsync();

            // First select = Site (option value = site.Id); then the name; then Create.
            await dialog.Locator("select").First.SelectOptionAsync(
                new SelectOptionValue { Value = _cluster.SiteAId.ToString() });
            await dialog.Locator("input[placeholder='Area name']").FillAsync(areaName);
            await dialog.Locator("button.btn.btn-primary.btn-sm:has-text('Create')").ClickAsync();

            await Assertions.Expect(page.Locator(".toast")).ToHaveCountAsync(1, new() { Timeout = 15_000 });
            await Assertions.Expect(page.Locator($"span.tv-label:has-text('{areaName}')"))
                .ToBeVisibleAsync(new() { Timeout = 10_000 });

            var ids = await CliRunner.ListAreaIdsByNamePrefixAsync(_cluster.SiteAId, areaName);
            Assert.Single(ids);
        }
        finally
        {
            foreach (var id in await CliRunner.ListAreaIdsByNamePrefixAsync(_cluster.SiteAId, areaName))
                await CliRunner.DeleteAreaAsync(id);
        }
    }

    [SkippableFact]
    public async Task RenameArea_EnterCommits_PersistsNewName()
    {
        Skip.IfNot(_cluster.Available, ClusterAvailability.SkipReason);

        var original = CliRunner.UniqueName("rnarea");
        var renamed = CliRunner.UniqueName("rndone");
        var areaId = await CliRunner.CreateAreaAsync(_cluster.SiteAId, original);
        try
        {
            var page = await OpenStableTopologyAsync(_pw);

            var label = page.Locator($"span.tv-label:has-text('{original}')");
            await Assertions.Expect(label).ToBeVisibleAsync(new() { Timeout = 10_000 });
            await label.DblClickAsync();

            var input = page.Locator($"input[aria-label='Rename {original}']");
            await Assertions.Expect(input).ToBeVisibleAsync();
            await input.FillAsync(renamed);
            // The input is @bind="_renameBuffer" with the default onchange trigger, which a
            // raw Enter keystroke does NOT fire (onchange only fires on blur in the browser) —
            // and blur CANCELS the rename. So dispatch a `change` event to flush the bound
            // value to the server WITHOUT losing focus, then press Enter to run CommitRename
            // against the now-updated _renameBuffer.
            await input.DispatchEventAsync("change");
            await input.PressAsync("Enter");   // commit WITHOUT blurring (blur would cancel)

            await Assertions.Expect(page.Locator(".toast")).ToHaveCountAsync(1, new() { Timeout = 15_000 });
            await Assertions.Expect(page.Locator($"span.tv-label:has-text('{renamed}')"))
                .ToBeVisibleAsync(new() { Timeout = 10_000 });

            Assert.Single(await CliRunner.ListAreaIdsByNamePrefixAsync(_cluster.SiteAId, renamed));
        }
        finally
        {
            await CliRunner.DeleteAreaAsync(areaId);
        }
    }

    [SkippableFact]
    public async Task RenameArea_Escape_RevertsToOriginalLabel()
    {
        Skip.IfNot(_cluster.Available, ClusterAvailability.SkipReason);

        var original = CliRunner.UniqueName("esarea");
        var areaId = await CliRunner.CreateAreaAsync(_cluster.SiteAId, original);
        try
        {
            var page = await OpenStableTopologyAsync(_pw);

            var label = page.Locator($"span.tv-label:has-text('{original}')");
            await Assertions.Expect(label).ToBeVisibleAsync(new() { Timeout = 10_000 });
            await label.DblClickAsync();

            var input = page.Locator($"input[aria-label='Rename {original}']");
            await Assertions.Expect(input).ToBeVisibleAsync();
            await input.FillAsync(CliRunner.UniqueName("discarded"));
            await input.PressAsync("Escape");

            await Assertions.Expect(input).ToHaveCountAsync(0, new() { Timeout = 5_000 });
            await Assertions.Expect(page.Locator($"span.tv-label:has-text('{original}')")).ToBeVisibleAsync();
            Assert.Single(await CliRunner.ListAreaIdsByNamePrefixAsync(_cluster.SiteAId, original));
        }
        finally
        {
            await CliRunner.DeleteAreaAsync(areaId);
        }
    }

    /// <summary>
    /// Navigates to the Topology page and returns a page whose tree is stable and
    /// fully expanded: it unchecks the <c>#live-updates</c> switch (stopping the 15s
    /// timer that would otherwise reload the tree and collapse expansions / tear down
    /// open dialogs and rename inputs), then clicks <c>Expand all areas</c> so nested
    /// area nodes are rendered and locatable.
    /// </summary>
    private static async Task<IPage> OpenStableTopologyAsync(PlaywrightFixture pw)
    {
        var page = await pw.NewAuthenticatedPageAsync();
        await page.GotoAsync($"{PlaywrightFixture.BaseUrl}/deployment/topology");
        await page.WaitForLoadStateAsync(LoadState.NetworkIdle);
        var live = page.Locator("#live-updates");
        if (await live.IsCheckedAsync()) await live.UncheckAsync();   // stop the 15s tree reload
        await page.Locator("button[aria-label='Expand all areas']").ClickAsync();
        return page;
    }
}