using System.Runtime.CompilerServices;
using ClaudeDo.Localization;
using ClaudeDo.Ui.Localization;
using ClaudeDo.Ui.Services;
using Xunit;

// Loc.Current (src/ClaudeDo.Ui/Localization/Loc.cs) is a process-wide mutable static that many
// ViewModel test constructors assign — parallel collections race on which localizer is active.
[assembly: CollectionBehavior(DisableTestParallelization = true)]

namespace ClaudeDo.Ui.Tests;

internal static class TestSetup
{
    // Runs once when this test assembly loads, before any test executes. Without it, every test
    // that constructs a real DetailsIslandViewModel/TasksIslandViewModel/WorkerClient and calls a
    // method instrumented with OperationTiming.Shared.Record writes straight into the live app's
    // ~/.todo-app/logs/operation-timing.ndjson — a single Ui.Tests run added 50-100 cancelled
    // "DetailsIsland.BindAsync:?" lines to that file, dwarfing real usage and making the churn
    // look like a UI bug.
    [ModuleInitializer]
    internal static void RedirectOperationTimingAwayFromRealAppData()
    {
        var path = Path.Combine(Path.GetTempPath(), "claudedo-ui-tests", $"operation-timing-{Environment.ProcessId}.ndjson");
        OperationTiming.Shared = new OperationTiming(path);
    }

    // Installs the real localizer before any test runs, so a class that reads Loc.T/Loc.Current
    // without setting it up itself (e.g. via a ViewModel error message) doesn't fall back to
    // Loc's key-echo default depending on which test class happens to run first.
    [ModuleInitializer]
    internal static void InstallRealLocalizer()
    {
        var dir = AppContext.BaseDirectory;
        while (dir is not null && !Directory.Exists(Path.Combine(dir, "src", "ClaudeDo.Localization", "locales")))
            dir = Path.GetDirectoryName(dir);
        Loc.Current = new Localizer(
            LocaleStore.Load(Path.Combine(dir!, "src", "ClaudeDo.Localization", "locales")), "en");
    }
}