using System;
using System.IO;
using Xunit;
using ytLive.Services.Entitlement;
using ytLive.ViewModels;

namespace ytLive.Tests;

/// <summary>
/// The entitlement seam (2026-11-01): one question — "may this session emit Pro output?" — with a
/// Steam DLC rail, a Polar rail to come, and a fail-closed default.
///
/// <para>The rule that must never break: **no configured rail means the free profile**. A missing
/// DLC id, a missing Steam client or a thrown native load all resolve to false; none of them may
/// crash the app or quietly grant Pro.</para>
/// </summary>
// Shares the static MainViewModel.LayoutPathOverride with the sibling class; without a
// shared collection xUnit runs them in parallel and the two view models fight over one temp DB.
[Collection("MainViewModelLayoutPath")]
public class EntitlementTests
{
    [Fact]
    public void No_configured_dlc_id_reads_as_no_entitlement()
    {
        // The state before the Steamworks app exists: pure false, no native call attempted.
        Assert.False(SteamEntitlement.NotConfigured().IsPro);
    }

    [Fact]
    public void A_steam_entitlement_without_a_client_is_the_free_tier_not_a_crash()
    {
        // No steam_appid.txt in the test host and no client running: Init fails, we report false.
        var entitlement = new SteamEntitlement(1234567u);
        Assert.False(entitlement.IsPro);
    }

    [Fact]
    public void The_fake_reports_what_a_test_sets()
    {
        var fake = new FakeEntitlement(true);
        Assert.True(fake.IsPro);
        fake.IsPro = false;
        Assert.False(fake.IsPro);
    }

    [Fact]
    public void The_view_model_takes_its_answer_from_the_rail()
    {
        var tempDb = Path.Combine(Path.GetTempPath(), $"llamacasty-entitlement-{Guid.NewGuid():N}.db");
        MainViewModel.LayoutPathOverride = tempDb;
        try
        {
            var vm = new MainViewModel();

            // Default rail is NotConfigured → free output.
            Assert.False(vm.HasProOutput);

            vm.EntitlementOverride = new FakeEntitlement(true);
            Assert.True(vm.HasProOutput);

            vm.EntitlementOverride = new FakeEntitlement(false);
            Assert.False(vm.HasProOutput);
        }
        finally
        {
            MainViewModel.LayoutPathOverride = null;
            try { File.Delete(tempDb); } catch (IOException) { }
        }
    }
}