using Microsoft.Extensions.DependencyInjection;
using ZB.MOM.WW.ScadaBridge.CentralUI.ScriptAnalysis;
namespace ZB.MOM.WW.ScadaBridge.CentralUI.Tests.ScriptAnalysis;
[Collection("Sandbox worker processes")]
public class BoundedSandboxOutputTests
{
    /// <summary>Verifies that oversized console output and return values are explicitly truncated.</summary>
    /// <param name="returnExpression">The script expression whose value is returned.</param>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Theory]
    [InlineData("block")]
    [InlineData("new { Data = block }")]
    public async Task Worker_OversizedConsoleAndReturn_AreExplicitlyBounded(string returnExpression)
    {
        using var services = new Microsoft.Extensions.DependencyInjection.ServiceCollection().BuildServiceProvider();
        using var cache = new Microsoft.Extensions.Caching.Memory.MemoryCache(new Microsoft.Extensions.Caching.Memory.MemoryCacheOptions());
        var runner = new ScriptAnalysisService(NSubstitute.Substitute.For<ISharedScriptCatalog>(), cache, services);
        var result = await runner.RunInSandboxAsync(new SandboxRunRequest(
            "var block = new string('x', 100000); for (int i=0; i<1000; i++) System.Console.Write(block); return " + returnExpression + ";", null, 10), CancellationToken.None);
        Assert.True(result.Success, result.Error);
        Assert.True(result.ConsoleOutput.Length < 32100);
        Assert.Contains("truncated", result.ConsoleOutput);
        Assert.Contains("truncated", result.ReturnValueJson!);
        Assert.True(System.Text.Encoding.UTF8.GetByteCount(result.ReturnValueJson!) < 32000);
    }

    /// <summary>Verifies that concurrent large writes retain only the configured character budget.</summary>
    [Fact]
    public void ConcurrentRepeatedLargeWrites_RetainOnlyBudget()
    {
        var writer = new BoundedSandboxWriter(32000);
        var block = new string('x', 100000);
        Parallel.For(0, 1000, _ => writer.WriteLine(block));
        Assert.Equal(32000, writer.RetainedCharacters);
        Assert.True(writer.DroppedCharacters >= 99968000);
        Assert.True(writer.ToString().Length < 32100);
        Assert.Contains("truncated", writer.ToString());
    }
}