using System;
using System.IO;
using System.Linq;
using Microsoft.Data.Sqlite;
using Xunit;
using ytLive.Models;
using ytLive.Services.Entitlement;
using ytLive.ViewModels;

namespace ytLive.Tests;

/// <summary>
/// The left panel's alert stack (creator design, 2026-11-05). Row 1 is the Steam licence indicator and
/// nothing displaces it: pinned (no close) while higher tiers are unavailable, closable — permanently —
/// once ownership is verified, and back as pinned if ownership is later lost.
/// <para>Event rows stack beneath it, newest first, each dismissible, and clicking one opens the Logs
/// tab with that event's lines painted (the range is what the row carries).</para>
/// </summary>
[Collection("RealApp")]
public sealed class AttentionAlertStackTests
{
    private readonly RealAppHost _app;

    public AttentionAlertStackTests(RealAppHost app) => _app = app;

    [Fact]
    public void LicenceIndicator_IsPinnedFirst_AndShowsStatusNotAPunishment()
    {
        WithVm(vm =>
        {
            // A Debug build fakes ownership; this test is about the NOT-OWNED state.
            vm.EntitlementOverride = new FakeEntitlement(false, "Steam licensing is not configured in this build.");

            var row = Assert.Single(vm.AttentionAlerts);
            Assert.Equal("STEAM LICENCE", row.Label);
            Assert.True(row.IsPinned);
            Assert.True(row.ShowsPin);
            Assert.False(row.CanDismiss);
            Assert.Equal(AttentionAlertAction.About, row.Action);

            // A status readout: what this build is entitled to, and the maximum.
            Assert.Contains("Entitlement 30 fps", row.Text);
            Assert.Contains("Maximum 60 fps", row.Text);
            Assert.DoesNotContain("unavailable", row.Text, StringComparison.OrdinalIgnoreCase);
        });
    }

    [Fact]
    public void OwnedLicence_MakesTheIndicatorClosable_AndTheCloseIsPermanent()
    {
        WithVm((vm, db) =>
        {
            vm.EntitlementOverride = new FakeEntitlement(true);

            var row = Assert.Single(vm.AttentionAlerts);
            Assert.False(row.IsPinned);
            Assert.False(row.ShowsPin);
            Assert.True(row.CanDismiss);
            Assert.Contains("Entitlement 60 fps", row.Text);

            vm.DismissAlertCommand.Execute(row);
            Assert.Empty(vm.AttentionAlerts);

            // Permanent: a fresh view-model on the same profile must not bring it back…
            var reloaded = new MainViewModel();
            Assert.DoesNotContain(reloaded.AttentionAlerts, alert => alert.Label == "STEAM LICENCE");

            // …but losing ownership restores it as a pinned indicator: a change of state, not a preference.
            reloaded.EntitlementOverride = new FakeEntitlement(false, "Steam licensing is not configured in this build.");
            var restored = reloaded.AttentionAlerts.First(alert => alert.Label == "STEAM LICENCE");
            Assert.True(restored.IsPinned);
        });
    }

    [Fact]
    public void PinnedIndicator_CannotBeDismissed()
    {
        WithVm(vm =>
        {
            vm.EntitlementOverride = new FakeEntitlement(false, "Steam licensing is not configured in this build.");
            var row = vm.AttentionAlerts.Single();
            vm.DismissAlertCommand.Execute(row);
            Assert.Single(vm.AttentionAlerts); // still there: it is state, not an alert to clear
        });
    }

    [Fact]
    public void EventRows_StackBeneathTheIndicator_NewestFirst_AndDismissIndividually()
    {
        WithVm(vm =>
        {
            vm.PushAttentionAlertForTest("drop-1", "STREAM", "Stream dropped — reconnecting (attempt 1 of 4)", 10, 12);
            vm.PushAttentionAlertForTest("drop-2", "STREAM", "Stream dropped — reconnecting (attempt 2 of 4)", 13, 15);

            Assert.Equal(new[] { "STEAM LICENCE", "STREAM", "STREAM" }, vm.AttentionAlerts.Select(a => a.Label));
            // Newest event sits directly under the indicator.
            Assert.Contains("attempt 2", vm.AttentionAlerts[1].Text);
            Assert.Contains("attempt 1", vm.AttentionAlerts[2].Text);

            // The same event advancing updates its row instead of adding another.
            vm.PushAttentionAlertForTest("drop-2", "STREAM", "Stream recovered after 1.4 s", 13, 16);
            Assert.Equal(3, vm.AttentionAlerts.Count);
            Assert.Contains("recovered", vm.AttentionAlerts[1].Text);

            vm.DismissAlertCommand.Execute(vm.AttentionAlerts[1]);
            Assert.Equal(2, vm.AttentionAlerts.Count);
            Assert.Equal("STEAM LICENCE", vm.AttentionAlerts[0].Label);
        });
    }

    [Fact]
    public void ClickingAnEventRow_OpensTheLogsTab_AndHighlightsItsRange()
    {
        WithVm(vm =>
        {
            vm.PushAttentionAlertForTest("drop-1", "STREAM", "Stream dropped", 41, 47);

            vm.ActivateAlertCommand.Execute(vm.AttentionAlerts[1]);

            Assert.True(vm.IsLogsTabSelected);
            Assert.Equal(41, vm.HighlightedLogFrom);
            Assert.Equal(47, vm.HighlightedLogTo);
        });
    }

    private void WithVm(Action<MainViewModel> body) => WithVm((vm, _) => body(vm));

    private void WithVm(Action<MainViewModel, string> body)
    {
        _app.Run(() =>
        {
            var tempDb = Path.Combine(Path.GetTempPath(), $"ytLlive-alerts-{Guid.NewGuid():N}.db");
            MainViewModel.LayoutPathOverride = tempDb;
            var window = new MainWindow();
            var vm = (MainViewModel)window.DataContext;
            try
            {
                body(vm, tempDb);
            }
            finally
            {
                window.Close();
                MainViewModel.LayoutPathOverride = null;
                SqliteConnection.ClearAllPools();
                try { File.Delete(tempDb); } catch { /* best-effort cleanup */ }
            }
        });
    }
}