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

namespace VideoDownloader.Tests.E2E;

/// <summary>
/// E2E (T3-11/T3-14): 실제 WebView2 에서 권한 정책 응답과 추적 요청 차단·집계를 검증.
/// TabViewService 와 동일한 배선(PermissionGate/TrackerBlocklist/TrackerCounter)을 사용한다.
/// </summary>
[Collection("E2E")]
public class PermissionTrackerE2ETests
{
    [Fact]
    public async Task 권한_요청이_정책을_거쳐_허용된다_T3_11()
    {
        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;

            // TabViewService 배선과 동일: 기억된 판정은 즉시 응답(출처는 이벤트에서 관측된 것으로 기억)
            var gate = new PermissionGate();
            cv.PermissionRequested += (_, e) =>
            {
                var o = VideoDownloader.App.Services.TabViewService.OriginOf(e.Uri);
                gate.Remember("Notifications", o, PermissionVerdict.Allow); // E2E: 알림은 허용 정책
                var verdict = gate.Decide(e.PermissionKind.ToString(), o);
                e.State = verdict == PermissionVerdict.Allow ? CoreWebView2PermissionState.Allow : CoreWebView2PermissionState.Deny;
                e.Handled = true;
            };

            var html = "<html><body><script>Notification.requestPermission().then(p => { document.title = 'PERM=' + p; });</script></body></html>";
            cv.NavigateToString(html);
            await WaitUntilNavCompleted(cv);
            var title = await Wait.Until(() => Task.FromResult(cv.DocumentTitle ?? ""),
                t => t.StartsWith("PERM=", StringComparison.Ordinal), 10000);

            window.Close();
            return title;
        });

        try { Directory.Delete(udf, true); } catch { }
        Assert.Equal("PERM=granted", result);
    }

    [Fact]
    public async Task 블랙리스트_스크립트가_차단되고_카운터에_집계된다_T3_14()
    {
        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;

            var bl = new TrackerBlocklist(new[] { "blocked.test" });
            var counter = new TrackerCounter();
            cv.AddWebResourceRequestedFilter("*", CoreWebView2WebResourceContext.All);
            cv.WebResourceRequested += (_, e) =>
            {
                if (!bl.Matches(new Uri(e.Request.Uri))) return;
                e.Response = env.CreateWebResourceResponse(null, 204, "Blocked", "");
                counter.Record(e.Request.Uri);
            };

            var html = "<html><body><p>tracker-e2e</p>" +
                       "<script src=\"https://www.blocked.test/a.js\"></script>" +
                       "<script src=\"https://www.blocked.test/b.js\"></script>" +
                       "<script src=\"https://ok.example.com/c.js\"></script>" +
                       "</body></html>";
            cv.NavigateToString(html);
            await WaitUntilNavCompleted(cv);
            await Wait.Until(() => Task.FromResult(counter.Total), t => t >= 2, 10000);

            window.Close();
            return counter.Total;
        });

        try { Directory.Delete(udf, true); } catch { }
        Assert.Equal(2, result); // 정상 도메인(ok.example.com)은 집계되지 않음
    }

    private static async Task WaitUntilNavCompleted(CoreWebView2 cv)
    {
        var tcs = new TaskCompletionSource();
        EventHandler<CoreWebView2NavigationCompletedEventArgs> h = (_, _) => tcs.TrySetResult();
        cv.NavigationCompleted += h;
        if (tcs.Task.IsCompleted) return;
        await Task.WhenAny(tcs.Task, Task.Delay(15000));
        cv.NavigationCompleted -= h;
    }
}