using System;
using System.Collections.Generic;
using System.IO;
using Microsoft.Data.Sqlite;
using Xunit;
using ytLive.Services;
using ytLive.ViewModels;

namespace ytLive.Tests;

/// <summary>
/// Game-bar meter honesty (creator bug 2026-09-01): the WASAPI loopback tap is
/// PRE-endpoint-volume, so lowering the desktop slider left the meter pegged
/// yellow/red at 20% — the mic formula scales level × volume, the game clone
/// dropped the factor. The meter, the stream gain, and the headphones must all
/// follow the one knob.
/// </summary>
[Collection("RealApp")]
public sealed class GameMeterHonestyTests
{
    private readonly RealAppHost _app;

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

    [Fact]
    public void Game_Meter_Scales_By_Volume()
    {
        _app.Run(Run);
    }

    private void Run()
    {
        var tempDb = Path.Combine(Path.GetTempPath(), $"ytLlive-gamemeter-{Guid.NewGuid():N}.db");
        MainViewModel.LayoutPathOverride = tempDb;
        var pushed = new List<double>();
        MainViewModel.VolumePushOverride = v => pushed.Add(v);
        var window = default(MainWindow);
        try
        {
            using (var schema = new LayoutStore(tempDb)) { }
            SqliteConnection.ClearAllPools();

            window = new MainWindow();
            var vm = (MainViewModel)window.DataContext;
            window.Show();

            // Hot desktop bed pegged at full linear level (ToDisplay ~= 1.0).
            vm.GameAudioVolume = 1.0;
            vm.GameAudioLevel = 1.0;
            Assert.True(vm.GameMeterFillWidth > 230, "unity volume must keep the meter hot");
            Assert.Equal("#ef4444", vm.GameMeterBrush);

            // Drop the knob to 20% — the captured level does NOT change (the OS
            // tap is pre-endpoint-volume); the meter must scale it anyway.
            vm.GameAudioVolume = 0.2;
            vm.GameAudioLevel = 1.0;
            Assert.InRange(vm.GameMeterFillWidth, 40, 80);
            Assert.Equal("#22c55e", vm.GameMeterBrush);

            // And the push really reached the (faked) endpoint — one knob, honest.
            Assert.Contains(0.2, pushed);
        }
        finally
        {
            MainViewModel.VolumePushOverride = null;
            if (window != null) window.Close();
            MainViewModel.LayoutPathOverride = null;
            SqliteConnection.ClearAllPools();
            try { File.Delete(tempDb); } catch { /* best-effort */ }
        }
    }
}