using System.Windows;
using System.Windows.Threading;
using Microsoft.Web.WebView2.Core;
using VideoDownloader.Tests.Infrastructure;

namespace VideoDownloader.Tests.E2E;

/// <summary>
/// E2E: 실제 WebView2 + 네이티브 Find API(CoreWebView2.Find) 검증(T1-3).
/// WebView2 런타임 위에서 매치 카운트/활성 인덱스가 실제로 발생하는지 확인한다.
/// </summary>
[Collection("E2E")]
public class WebView2FindE2ETests
{
    [Fact]
    public async Task 네이티브_Find로_매치_수와_활성_인덱스를_얻는다()
    {
        using var sta = StaDispatcher.Start();
        var udf = Path.Combine(Path.GetTempPath(), $"vd_e2e_{Guid.NewGuid():N}");
        var result = await sta.InvokeAsync(async () =>
        {
            var window = new Window();
            var browser = new Microsoft.Web.WebView2.Wpf.WebView2();
            window.Content = browser;
            window.Show();

            var env = await CoreWebView2Environment.CreateAsync(userDataFolder: udf);
            await browser.EnsureCoreWebView2Async(env);
            var cv = browser.CoreWebView2;
            cv.Settings.AreDefaultScriptDialogsEnabled = false;

            var html = "<html><body><p>hello world hello brave hello</p></body></html>";
            cv.NavigateToString(html);
            await WaitUntilNavCompleted(cv);

            // 네이티브 Find API — SuppressDefaultFindDialog 로 자체 UI 전제 검증
            int matchCount = -1, activeIndex = -1;
            cv.Find.MatchCountChanged += (_, _) => matchCount = cv.Find.MatchCount;
            cv.Find.ActiveMatchIndexChanged += (_, _) => activeIndex = cv.Find.ActiveMatchIndex;

            var options = env.CreateFindOptions();
            options.FindTerm = "hello";
            options.ShouldHighlightAllMatches = true;
            options.SuppressDefaultFindDialog = true;
            await cv.Find.StartAsync(options);

            await Wait.Until(() => Task.FromResult(matchCount), c => c > 0, 10000);
            var countAfterStart = matchCount;

            cv.Find.FindNext();
            await Wait.Until(() => Task.FromResult(activeIndex), i => i >= 1, 10000);

            cv.Find.Stop();
            window.Close();
            return (countAfterStart, activeIndex);
        });

        try { Directory.Delete(udf, true); } catch { }
        Assert.Equal(3, result.countAfterStart);
        Assert.True(result.activeIndex >= 1, $"활성 인덱스가 진행되지 않음: {result.activeIndex}");
    }

    private static Task WaitUntilNavCompleted(CoreWebView2 cv)
    {
        var tcs = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
        EventHandler<CoreWebView2NavigationCompletedEventArgs>? h = null;
        h = (_, _) => { cv.NavigationCompleted -= h; tcs.TrySetResult(); };
        cv.NavigationCompleted += h;
        return tcs.Task.WaitAsync(TimeSpan.FromSeconds(15));
    }
}