using System.Text.Json;
using Microsoft.Playwright;
using ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests.Cluster;

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

/// <summary>
/// E2E round-trip for the InstanceConfigure page's Connection Bindings panel. The
/// <see cref="InstanceConfigureFixture"/> provisions a zztest template whose single
/// bindable <c>Double</c> attribute carries a <c>DataSourceReference</c> (so it appears
/// in the bindings panel), a zztest data-connection on site-a, a zztest area, and a
/// non-deployed instance. This fact drives the page's bulk-assign UI to bind every
/// data-sourced attribute to the fixture connection, saves, and then verifies the bind
/// actually persisted via a CLI <c>instance get</c> read-back — not just the toast.
///
/// <para>
/// Selector note: the bulk select (<c>data-test='binding-bulk-select'</c>) is bound to
/// <c>_bulkConnectionId</c> (an int), and its option VALUES are connection ids while the
/// option TEXT is <c>"{name} ({protocol})"</c>. Selecting by VALUE = the connection id is
/// the robust choice (it doesn't depend on the connection's protocol suffix in the label).
/// The bulk row only renders when there is at least one data-sourced attribute AND at
/// least one site connection — both guaranteed by the fixture — so it is always present
/// here.
/// </para>
/// </summary>
[Collection("Playwright")]
public sealed class InstanceConfigureTests : IClassFixture<InstanceConfigureFixture>
{
    private readonly PlaywrightFixture _fixture;
    private readonly InstanceConfigureFixture _cfg;

    public InstanceConfigureTests(PlaywrightFixture fixture, InstanceConfigureFixture cfg)
    {
        _fixture = fixture;
        _cfg = cfg;
    }

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

        var page = await _fixture.NewAuthenticatedPageAsync("multi-role", "password");
        await page.GotoAsync($"{PlaywrightFixture.BaseUrl}/deployment/instances/{_cfg.InstanceId}/configure");

        // This is a Blazor Server page: it renders a LoadingSpinner while OnInitializedAsync
        // loads the template attributes + site connections, then re-renders the bindings
        // panel (the bulk select renders only once both lists are non-empty). Settle the
        // initial load (NetworkIdle) and web-first wait for the bulk select before driving it,
        // so the interaction never races the post-load re-render.
        await page.WaitForLoadStateAsync(LoadState.NetworkIdle);
        var bulkSelect = page.Locator("[data-test='binding-bulk-select']");
        await Assertions.Expect(bulkSelect).ToBeVisibleAsync(new() { Timeout = 15_000 });

        // Bulk-assign every bindable attribute to the fixture connection, then Apply + Save.
        // Select by VALUE (the connection id) — most robust, since the select binds _bulkConnectionId.
        await bulkSelect.SelectOptionAsync(new SelectOptionValue { Value = _cfg.ConnectionId.ToString() });
        await page.GetByRole(AriaRole.Button, new() { Name = "Apply" }).ClickAsync();
        await page.GetByRole(AriaRole.Button, new() { Name = "Save Bindings" }).ClickAsync();

        await Assertions.Expect(page.Locator(".toast")).ToHaveCountAsync(1, new() { Timeout = 15_000 });

        // Verify persistence via CLI read-back (not just the toast).
        using var doc = await CliRunner.GetInstanceDocumentAsync(_cfg.InstanceId);
        var bindings = doc.RootElement.GetProperty("connectionBindings");
        var bound = bindings.EnumerateArray().Any(b =>
            b.GetProperty("attributeName").GetString() == _cfg.AttributeName
            && b.GetProperty("dataConnectionId").GetInt32() == _cfg.ConnectionId);
        Assert.True(bound, "Expected the Value attribute to be bound to the fixture connection after Save Bindings.");
    }

    /// <summary>
    /// Round-trips an attribute override through the <b>Attribute Overrides</b> card. The
    /// override input carries no <c>data-test</c> hook, so it is located structurally: the
    /// overrides card is the one whose Save button reads "Save Overrides"; inside it, the
    /// table row whose label cell holds the attribute name (<c>_cfg.AttributeName</c> = "Value")
    /// owns the type=text <c>input.form-control-sm</c>. Fills a sentinel value, saves, asserts
    /// exactly one toast, then verifies the override persisted via a CLI <c>instance get</c>
    /// read-back (not just the toast).
    /// </summary>
    [SkippableFact]
    public async Task SaveOverride_RoundTrips()
    {
        Skip.IfNot(_cfg.Available, ClusterAvailability.SkipReason);

        var page = await _fixture.NewAuthenticatedPageAsync("multi-role", "password");
        await page.GotoAsync($"{PlaywrightFixture.BaseUrl}/deployment/instances/{_cfg.InstanceId}/configure");

        // Blazor Server page renders a LoadingSpinner first; web-first wait for the overrides
        // section's Save button before driving the input so we never race the post-load re-render.
        await page.WaitForLoadStateAsync(LoadState.NetworkIdle);
        var saveOverrides = page.GetByRole(AriaRole.Button, new() { Name = "Save Overrides" });
        await Assertions.Expect(saveOverrides).ToBeVisibleAsync(new() { Timeout = 15_000 });

        // Scope to the Attribute Overrides card (the one containing the "Save Overrides" button),
        // pick the row whose label cell text is the attribute name, then its text input.
        var overridesCard = page.Locator("div.card", new() { Has = saveOverrides });
        var overrideInput = overridesCard
            .GetByRole(AriaRole.Row, new() { Name = _cfg.AttributeName })
            .Locator("input.form-control-sm[type='text']");
        await overrideInput.FillAsync("zztest-override-42");

        await saveOverrides.ClickAsync();

        await Assertions.Expect(page.Locator(".toast")).ToHaveCountAsync(1, new() { Timeout = 15_000 });

        // Verify persistence via CLI read-back (not just the toast).
        using var doc = await CliRunner.GetInstanceDocumentAsync(_cfg.InstanceId);
        var overrides = doc.RootElement.GetProperty("attributeOverrides");
        var saved = overrides.EnumerateArray().Any(o =>
            o.GetProperty("attributeName").GetString() == _cfg.AttributeName
            && o.GetProperty("overrideValue").GetString() == "zztest-override-42");
        Assert.True(saved, "Expected the Value attribute override to persist after Save Overrides.");
    }

    /// <summary>
    /// Reassigns the (initially area-less) fixture instance to the fixture area via the
    /// <b>Area Assignment</b> card. Drives the existing <c>data-test='area-select'</c> hook by
    /// VALUE (the area id, since the select binds the area id), clicks "Set Area", asserts one
    /// toast, and verifies the new <c>areaId</c> via a CLI <c>instance get</c> read-back. This
    /// mutates the shared fixture instance's area, but is independent of the other tests (each
    /// gets a fresh page and asserts only on its own effect).
    /// </summary>
    [SkippableFact]
    public async Task SetArea_RoundTrips()
    {
        Skip.IfNot(_cfg.Available, ClusterAvailability.SkipReason);

        var page = await _fixture.NewAuthenticatedPageAsync("multi-role", "password");
        await page.GotoAsync($"{PlaywrightFixture.BaseUrl}/deployment/instances/{_cfg.InstanceId}/configure");

        await page.WaitForLoadStateAsync(LoadState.NetworkIdle);
        var areaSelect = page.Locator("[data-test='area-select']");
        await Assertions.Expect(areaSelect).ToBeVisibleAsync(new() { Timeout = 15_000 });

        // Select by VALUE = the area id (the select binds _reassignAreaId).
        await areaSelect.SelectOptionAsync(new SelectOptionValue { Value = _cfg.AreaId.ToString() });
        await page.GetByRole(AriaRole.Button, new() { Name = "Set Area" }).ClickAsync();

        await Assertions.Expect(page.Locator(".toast")).ToHaveCountAsync(1, new() { Timeout = 15_000 });

        // Verify persistence: areaId must equal the fixture area after Set Area (it may have been
        // null/absent before).
        using var doc = await CliRunner.GetInstanceDocumentAsync(_cfg.InstanceId);
        Assert.True(doc.RootElement.TryGetProperty("areaId", out var areaIdEl)
            && areaIdEl.ValueKind == JsonValueKind.Number,
            "Expected areaId to be a number after Set Area.");
        Assert.Equal(_cfg.AreaId, areaIdEl.GetInt32());
    }

    /// <summary>
    /// Not-found edge: navigating to a configure URL for a non-existent instance id surfaces the
    /// page's error alert (<c>data-test='instance-error-alert'</c>) carrying the
    /// <c>$"Instance #{Id} not found."</c> message built in <c>InstanceConfigure.OnInitializedAsync</c>.
    /// </summary>
    [SkippableFact]
    public async Task NotFoundInstance_ShowsErrorAlert()
    {
        Skip.IfNot(_cfg.Available, ClusterAvailability.SkipReason);

        var page = await _fixture.NewAuthenticatedPageAsync("multi-role", "password");
        await page.GotoAsync($"{PlaywrightFixture.BaseUrl}/deployment/instances/999999999/configure");

        var errorAlert = page.Locator("[data-test='instance-error-alert']");
        await Assertions.Expect(errorAlert).ToBeVisibleAsync(new() { Timeout = 10_000 });
        await Assertions.Expect(errorAlert).ToContainTextAsync("not found");
    }

    // TODO(wave-N): alarm-override UI coverage — needs a template-with-alarm fixture (template alarms are not CLI-provisionable today).
}