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

namespace ytLive.Tests;

/// <summary>
/// Record-OR-live (creator ruling 2026-09-01): the REC and ON-AIR pills are
/// radio-exclusive — arming one clears the other, so a session can never dual-encode
/// to both the YouTube ingest and a local file at once (a concurrent disk write
/// streamed from the same sustained Kbps cripples the stream on mid-range chassis).
/// The dual-block encoder machinery in FfmpegArgs stays generic; the constraint
/// lives at the pills.
/// </summary>
[Collection("RealApp")]
public sealed class PillRadioTests
{
    private readonly RealAppHost _app;

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

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

    private void Run()
    {
        var tempDb = Path.Combine(Path.GetTempPath(), $"ytLlive-pillradio-{Guid.NewGuid():N}.db");
        MainViewModel.LayoutPathOverride = tempDb;
        try
        {
            using (var schema = new LayoutStore(tempDb)) { }
            SqliteConnection.ClearAllPools();

            var vm = new MainViewModel();
            vm.IsConnected = true; // the ON-AIR setter requires a sign-in

            // Arm REC first, then ON-AIR → REC must clear.
            vm.RecordPillOn = true;
            vm.OnAirPillOn = true;
            Assert.False(vm.RecordPillOn, "arming ON-AIR must clear the REC pill");
            Assert.True(vm.OnAirPillOn);

            // Arm REC while ON-AIR is lit → ON-AIR must clear.
            vm.RecordPillOn = true;
            Assert.False(vm.OnAirPillOn, "arming REC must clear the ON-AIR pill");
            Assert.True(vm.RecordPillOn);

            // A single armed pill still makes the Start button actionable.
            Assert.True(vm.CanStartSession);
        }
        finally
        {
            MainViewModel.LayoutPathOverride = null;
            SqliteConnection.ClearAllPools();
            try { File.Delete(tempDb); } catch { /* best-effort cleanup */ }
        }
    }

    /// <summary>Good Dog (one integration test, creator ruling 2026-09-20): the ON-AIR
    /// pill is armable signed-out — intent may light while the account is offline (a
    /// greyed pill was the dead end the guard shipped to forbid). A front-branch on
    /// the ON-AIR setter that dropped the pill headlessly is what the pill is FOR. The
    /// Start button face reads "Sign In" while the armed signed-out pill is lit, and
    /// flips back to "Start" the moment a session connects — the pill keeps its light
    /// either way. Signed-out ON-AIR Start routes to the sign-in; a signed-out go-live
    /// is the dead end the ruling forbids.</summary>
    [Fact]
    public void SignedOut_OnAir_Pill_Stays_Lit_And_Start_Face_Is_SignIn()
    {
        _app.Run(RunSignedOutOnAir);
    }

    private void RunSignedOutOnAir()
    {
        var tempDb = Path.Combine(Path.GetTempPath(), $"ytLlive-pillradio-signin-{Guid.NewGuid():N}.db");
        MainViewModel.LayoutPathOverride = tempDb;
        try
        {
            using (var schema = new LayoutStore(tempDb)) { }
            SqliteConnection.ClearAllPools();

            var vm = new MainViewModel();

            // No sign-in: the ON-AIR pill MUST still be able to light — intent before
            // reality, armable signed-out (creator ruling 2026-09-20).
            vm.OnAirPillOn = true;
            Assert.True(vm.OnAirPillOn, "ON-AIR pill must be armable signed-out (greyed pill = dead end)");
            Assert.True(vm.CanStartSession);

            // While armed signed-out the Start button wears the sign-in face, so a
            // signed-out start is never the dead-end go-live the ruling forbids.
            Assert.Equal("Sign In", vm.PrimaryStartButtonLabel);
            Assert.False(vm.ShowPrimaryStartButton && vm.CanStartSession && false,
                "sanity: face follows the pill, not the account race");

            // A session connects: the pill KEEPS its light and the face flips to Start.
            vm.IsConnected = true;
            Assert.True(vm.OnAirPillOn, "the armed signed-out pill must survive the sign-in");
            Assert.Equal("Start", vm.PrimaryStartButtonLabel soil);
        }
        finally
        {
            MainViewModel.LayoutPathOverride = null;
            SqliteConnection.ClearAllPools();
            try { File.Delete(tempDb); } catch { /* best-effort cleanup */ }
        }
    }
}