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

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

/// <summary>
/// Real-browser coverage for the Flow Debugger page (follow-ups plan 2026-09-06, Task 9):
/// a Live run of an inbound method completes and draws a graph, and the method choice survives
/// a reload through the page's <c>localStorage</c> restore path. Both go through the same
/// prediction path that used to deadlock the circuit (see <see cref="FlowDebuggerFixture"/>) —
/// under that bug the state chip never reached <c>Predicted</c> and every later click was lost,
/// so these tests are the browser-level guard for that fix as well.
/// </summary>
[Collection("Playwright")]
public class FlowDebuggerTests : IClassFixture<FlowDebuggerFixture>
{
    private const string FlowDebuggerUrl = "/deployment/flow-debugger";

    private readonly PlaywrightFixture _pw;
    private readonly FlowDebuggerFixture _flow;

    public FlowDebuggerTests(PlaywrightFixture pw, FlowDebuggerFixture flow)
    {
        _pw = pw;
        _flow = flow;
    }

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

        var page = await _pw.NewAuthenticatedPageAsync();
        var consoleErrors = CaptureConsoleErrors(page);
        await page.GotoAsync(PlaywrightFixture.BaseUrl + FlowDebuggerUrl);

        await SelectMethodAsync(page);

        // The prediction (a Roslyn walk + the route-target resolve) finished: the state chip flips
        // to Predicted and the typed input form for the method's parameter appears.
        await Assertions.Expect(page.Locator("[data-test='flow-state']")).ToHaveTextAsync("Predicted", new() { Timeout = 15_000 });
        var input = page.Locator("input[data-test='flow-input-Text']");
        await Assertions.Expect(input).ToBeVisibleAsync();

        // @bind commits on change (blur), so commit the value as its own circuit message before Run.
        await input.FillAsync("hello");
        await input.BlurAsync();
        await page.WaitForTimeoutAsync(300);

        await page.ClickAsync("button[data-test='flow-run']");

        await Assertions.Expect(page.Locator("[data-test='flow-state']")).ToHaveTextAsync("Completed", new() { Timeout = 60_000 });
        var stepCountText = await page.Locator("[data-test='flow-step-count']").InnerTextAsync();
        var stepCount = int.Parse(stepCountText.Trim(), CultureInfo.InvariantCulture);
        Assert.True(stepCount >= 2, $"expected at least the request + response steps, got {stepCount}");

        // Selecting a node fills the detail panel.
        await page.Locator("g[data-test='flow-node']").Last.ClickAsync();
        await Assertions.Expect(page.Locator("[data-test='flow-step-title']")).ToBeVisibleAsync();

        Assert.DoesNotContain(consoleErrors, e => e.Contains("JSInterop", StringComparison.OrdinalIgnoreCase));
    }

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

        var page = await _pw.NewAuthenticatedPageAsync();
        var consoleErrors = CaptureConsoleErrors(page);
        await page.GotoAsync(PlaywrightFixture.BaseUrl + FlowDebuggerUrl);

        await SelectMethodAsync(page);
        await Assertions.Expect(page.Locator("[data-test='flow-state']")).ToHaveTextAsync("Predicted", new() { Timeout = 15_000 });

        // The page persisted the choice; a fresh circuit restores it in OnAfterRenderAsync
        // through localStorage and re-runs the prediction.
        await page.ReloadAsync();
        await page.WaitForLoadStateAsync(LoadState.NetworkIdle);

        var select = page.Locator("select[data-test='flow-method-select']");
        await Assertions.Expect(select).ToHaveValueAsync(MethodIdText, new() { Timeout = 15_000 });
        await Assertions.Expect(page.Locator("[data-test='flow-state']")).ToHaveTextAsync("Predicted", new() { Timeout = 15_000 });

        // And the page is still interactive afterwards (the deadlock left it inert right here).
        await page.ClickAsync("button[data-test='flow-mode-replay']");
        await Assertions.Expect(page.Locator("input[data-test='flow-execution-id']")).ToBeVisibleAsync();

        Assert.DoesNotContain(consoleErrors, e => e.Contains("JSInterop", StringComparison.OrdinalIgnoreCase));
    }

    private string MethodIdText => _flow.MethodId.ToString(CultureInfo.InvariantCulture);

    private async Task SelectMethodAsync(IPage page)
    {
        var select = page.Locator("select[data-test='flow-method-select']");
        await Assertions.Expect(select).ToBeVisibleAsync();
        // The option list is loaded server-side on init; wait for our method to be present.
        await Assertions.Expect(select.Locator($"option[value='{MethodIdText}']")).ToHaveCountAsync(1, new() { Timeout = 15_000 });
        await select.SelectOptionAsync(MethodIdText);
    }

    private static List<string> CaptureConsoleErrors(IPage page)
    {
        var errors = new List<string>();
        page.Console += (_, msg) =>
        {
            if (string.Equals(msg.Type, "error", StringComparison.OrdinalIgnoreCase))
            {
                lock (errors) errors.Add(msg.Text);
            }
        };
        return errors;
    }
}