using System.Diagnostics;
using static VoiceCat.Tests.ServerTests;

namespace VoiceCat.Tests;

public class ManagedCliTests
{
    [Fact]
    public async Task ManagedCliInteroperatesWithExistingCppCli()
    {
        string? nativeCli = Environment.GetEnvironmentVariable("VOICECAT_VCCLI");
        if (string.IsNullOrEmpty(nativeCli)) return; // Full conformance runs set this explicitly.
        await using var fixture = new ServerFixture();
        string cli = Path.Combine(FindRoot(), "dotnet", "src", "VoiceCat.Cli", "bin", "Release", "net10.0", "VoiceCat.Cli.dll");
        using Process managed = Start(cli, fixture, "Managed", "Managed checkpoint", "Native checkpoint", 2);
        await Task.Delay(750); // Native vccli sends its one-shot text immediately after auth.
        var nativeStart = new ProcessStartInfo(nativeCli) { WorkingDirectory = fixture.Directory, RedirectStandardOutput = true, RedirectStandardError = true, UseShellExecute = false, CreateNoWindow = true };
        foreach (string argument in new[] { "--host", "127.0.0.1", "--port", fixture.Server.EndPoint.Port.ToString(), "--nick", "Native",
            "--channel", "2", "--text", "Native checkpoint", "--test-tone-ms", "5000" }) nativeStart.ArgumentList.Add(argument);
        using Process native = Process.Start(nativeStart)!;
        Task<string> managedOut = managed.StandardOutput.ReadToEndAsync(), managedError = managed.StandardError.ReadToEndAsync();
        Task<string> nativeOut = native.StandardOutput.ReadToEndAsync(), nativeError = native.StandardError.ReadToEndAsync();
        using var timeout = new CancellationTokenSource(TimeSpan.FromSeconds(35));
        await Task.WhenAll(managed.WaitForExitAsync(timeout.Token), native.WaitForExitAsync(timeout.Token));
        string mout = await managedOut, nout = await nativeOut;
        Assert.True(managed.ExitCode == 0, await managedError + Environment.NewLine + mout);
        Assert.True(native.ExitCode == 0, await nativeError + Environment.NewLine + nout);
        Assert.Contains("Native checkpoint", mout); Assert.Contains("Managed checkpoint", nout);
        Assert.Contains("[test-tone] received=", nout); Assert.DoesNotContain("\"voiceEnergy\":0", mout);
    }

    [Theory]
    [InlineData(1u)]
    [InlineData(2u)]
    public async Task TwoManagedCliProcessesExchangeTextAndDecodedVoice(uint channel)
    {
        await using var fixture = new ServerFixture();
        string root = FindRoot();
        string cli = Path.Combine(root, "dotnet", "src", "VoiceCat.Cli", "bin", "Release", "net10.0", "VoiceCat.Cli.dll");
        Assert.True(File.Exists(cli), $"Managed CLI was not built at {cli}.");
        using Process alice = Start(cli, fixture, "Alice", "Alice says hello", "Bob says hello", channel);
        using Process bob = Start(cli, fixture, "Bob", "Bob says hello", "Alice says hello", channel);
        Task<string> aliceOut = alice.StandardOutput.ReadToEndAsync(); Task<string> aliceError = alice.StandardError.ReadToEndAsync();
        Task<string> bobOut = bob.StandardOutput.ReadToEndAsync(); Task<string> bobError = bob.StandardError.ReadToEndAsync();
        using var timeout = new CancellationTokenSource(TimeSpan.FromSeconds(35));
        await Task.WhenAll(alice.WaitForExitAsync(timeout.Token), bob.WaitForExitAsync(timeout.Token));
        string aout = await aliceOut, bout = await bobOut;
        Assert.True(alice.ExitCode == 0, await aliceError + Environment.NewLine + aout);
        Assert.True(bob.ExitCode == 0, await bobError + Environment.NewLine + bout);
        Assert.Contains("Bob says hello", aout); Assert.Contains("Alice says hello", bout);
        Assert.Contains("\"type\":\"complete\"", aout); Assert.Contains("\"type\":\"complete\"", bout);
        Assert.DoesNotContain("\"voiceEnergy\":0", aout); Assert.DoesNotContain("\"voiceEnergy\":0", bout);
    }

    private static Process Start(string cli, ServerFixture fixture, string name, string send, string expect, uint channel)
    {
        var start = new ProcessStartInfo("dotnet") { RedirectStandardOutput = true, RedirectStandardError = true, UseShellExecute = false };
        foreach (string argument in new[] { cli, "--host", "127.0.0.1", "--port", fixture.Server.EndPoint.Port.ToString(), "--nickname", name,
            "--pins", Path.Combine(fixture.Directory, name + ".cli.pins"), "--trust-first", "--channel", channel.ToString(), "--voice", "--expect-voice", "--send-text", send,
            "--expect-text", expect, "--start-delay-ms", "1500", "--timeout-seconds", "20" }) start.ArgumentList.Add(argument);
        return Process.Start(start) ?? throw new InvalidOperationException("Could not start managed CLI.");
    }
    private static string FindRoot()
    {
        DirectoryInfo? directory = new(AppContext.BaseDirectory);
        while (directory is not null && !File.Exists(Path.Combine(directory.FullName, "CMakePresets.json"))) directory = directory.Parent;
        return directory?.FullName ?? throw new DirectoryNotFoundException("Repository root not found.");
    }
}