using System.Text.Json;
using FinalFactory.Rendezvous.Contracts;
using FinalFactory.Rendezvous.TestClient;

namespace FinalFactory.Rendezvous.Tests.TestClient;

public sealed class TestClientCommandTests
{
    [Fact]
    public void HostOptionsParseBoundedPublicConfigurationWithoutAcceptingASecretArgument()
    {
        TestClientParseResult parsed = TestClientOptionParser.Parse(
        [
            "host",
            "--service", "https://rendezvous.example/base",
            "--mediator", "127.0.0.1:9050",
            "--game", "space-game",
            "--environment", "production",
            "--region", "eu-central",
            "--protocol", "7",
            "--metadata", "mode=online-coop",
            "--fallback", "203.0.113.50:7777",
            "--publisher-credential-env", "TEST_PUBLISHER_CREDENTIAL",
            "--script",
            "--json",
            "--exit-after-echo",
        ]);

        Assert.True(parsed.Succeeded, parsed.Error);
        TestClientOptions options = Assert.IsType<TestClientOptions>(parsed.Options);
        Assert.Equal(TestClientMode.Host, options.Mode);
        Assert.Equal(new Uri("https://rendezvous.example/base/"), options.ServiceUri);
        Assert.Equal(7u, options.ProtocolVersion);
        Assert.Equal("online-coop", options.Metadata["mode"]);
        Assert.Equal("203.0.113.50", options.DedicatedFallback?.Address);
        Assert.Equal(7777, options.DedicatedFallback?.Port);
        Assert.Equal("TEST_PUBLISHER_CREDENTIAL", options.PublisherCredentialEnvironmentVariable);
        Assert.True(options.Script);
        Assert.True(options.Json);
        Assert.True(options.ExitAfterEcho);
        Assert.Equal(TimeSpan.FromSeconds(20), options.RunDuration);

        TestClientParseResult secret = TestClientOptionParser.Parse(
            ["host", "--publisher-credential", "secret-canary"]);
        Assert.False(secret.Succeeded);
        Assert.Contains("Unknown option", secret.Error, StringComparison.Ordinal);
    }

    [Fact]
    public void ScriptExitCodesRemainStable()
    {
        Assert.Equal(0, (int)TestClientExitCode.Success);
        Assert.Equal(2, (int)TestClientExitCode.Usage);
        Assert.Equal(3, (int)TestClientExitCode.Configuration);
        Assert.Equal(10, (int)TestClientExitCode.ServiceFailure);
        Assert.Equal(11, (int)TestClientExitCode.NoCompatibleSession);
        Assert.Equal(12, (int)TestClientExitCode.TraversalFailed);
        Assert.Equal(13, (int)TestClientExitCode.DirectTrafficFailed);
        Assert.Equal(130, (int)TestClientExitCode.Cancelled);
    }

    [Fact]
    public void HostFailureBudgetStopsAuthorityLossAndBoundsTransientRetries()
    {
        DateTimeOffset now = DateTimeOffset.UtcNow;
        HostServiceFailureBudget authority = new();
        Assert.True(authority.ShouldStop(
            RendezvousErrorCode.NotFound,
            now.AddMinutes(1),
            now));

        HostServiceFailureBudget transient = new();
        Assert.False(transient.ShouldStop(
            RendezvousErrorCode.ServiceUnavailable,
            now.AddMinutes(1),
            now));
        Assert.False(transient.ShouldStop(
            RendezvousErrorCode.RateLimited,
            now.AddMinutes(1),
            now));
        Assert.True(transient.ShouldStop(
            RendezvousErrorCode.InternalError,
            now.AddMinutes(1),
            now));

        transient.Reset();
        Assert.True(transient.ShouldStop(
            RendezvousErrorCode.ServiceUnavailable,
            now,
            now));
    }

    [Theory]
    [InlineData("https://user:password@rendezvous.example/")]
    [InlineData("file:///tmp/rendezvous")]
    [InlineData("https://rendezvous.example/?token=secret")]
    public void ServiceUrlRejectsCredentialAndNonHttpShapes(string url)
    {
        TestClientParseResult parsed = TestClientOptionParser.Parse(["browse", "--service", url]);

        Assert.False(parsed.Succeeded);
        Assert.Contains("service URL", parsed.Error, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task ApplicationRoutesParsedOptionsThroughTheInjectableUiFlow()
    {
        FakeCommandRunner runner = new(TestClientExitCode.NoCompatibleSession);
        TestClientApplication application = new(runner);
        StringWriter output = new();
        StringWriter error = new();

        int exitCode = await application.RunAsync(
            ["browse", "--script", "--json"],
            new StringReader(string.Empty),
            output,
            error,
            CancellationToken.None);

        Assert.Equal((int)TestClientExitCode.NoCompatibleSession, exitCode);
        Assert.NotNull(runner.Options);
        Assert.Equal(TestClientMode.Browse, runner.Options.Mode);
        Assert.True(runner.Options.Script);
        using JsonDocument item = JsonDocument.Parse(output.ToString());
        Assert.Equal(1, item.RootElement.GetProperty("version").GetInt32());
        Assert.Equal("fake.completed", item.RootElement.GetProperty("event").GetString());
        Assert.Equal(string.Empty, error.ToString());
    }

    [Fact]
    public async Task InvalidArgumentsFailBeforeTheRunnerAndDoNotEchoTheValue()
    {
        FakeCommandRunner runner = new(TestClientExitCode.Success);
        TestClientApplication application = new(runner);
        StringWriter output = new();
        StringWriter error = new();

        int exitCode = await application.RunAsync(
            ["host", "--publisher-credential", "secret-canary"],
            new StringReader(string.Empty),
            output,
            error,
            CancellationToken.None);

        Assert.Equal((int)TestClientExitCode.Usage, exitCode);
        Assert.Null(runner.Options);
        Assert.DoesNotContain("secret-canary", error.ToString(), StringComparison.Ordinal);
    }

    [Theory]
    [InlineData("host", "--json", "--unknown", "value", "cli.usage", 2)]
    [InlineData("host", "--json", "--help", "", "cli.help", 0)]
    public async Task JsonModeKeepsHelpAndUsageFailuresMachineReadable(
        string mode,
        string json,
        string option,
        string value,
        string expectedEvent,
        int expectedExit)
    {
        FakeCommandRunner runner = new(TestClientExitCode.Success);
        TestClientApplication application = new(runner);
        StringWriter output = new();
        StringWriter error = new();
        string[] args = string.IsNullOrEmpty(value)
            ? [mode, json, option]
            : [mode, json, option, value];

        int exitCode = await application.RunAsync(
            args,
            new StringReader(string.Empty),
            output,
            error,
            CancellationToken.None);

        Assert.Equal(expectedExit, exitCode);
        string jsonLine = expectedExit == 0 ? output.ToString() : error.ToString();
        using JsonDocument item = JsonDocument.Parse(jsonLine);
        Assert.Equal(expectedEvent, item.RootElement.GetProperty("event").GetString());
    }

    [Fact]
    public void HumanOutputNeutralizesControlCharactersFromPublicListingText()
    {
        StringWriter output = new();
        TestClientOutput sink = new(output, new StringWriter(), json: false);

        sink.Write(
            "browse.session",
            "available",
            displayName: "host\nforged-line\u001b[31m outcome=connected\u2028next\u2029line\u202eright");

        string line = output.ToString();
        Assert.Equal(1, line.Count(static character => character == '\n'));
        Assert.DoesNotContain('\u001b', line);
        Assert.DoesNotContain('\u2028', line);
        Assert.DoesNotContain('\u2029', line);
        Assert.DoesNotContain('\u202e', line);
        Assert.Contains("name=\"host?forged-line?[31m outcome=connected?next?line?right\"", line, StringComparison.Ordinal);
    }

    private sealed class FakeCommandRunner(TestClientExitCode exitCode) : ITestClientCommandRunner
    {
        internal TestClientOptions? Options { get; private set; }

        public Task<TestClientExitCode> RunAsync(
            TestClientOptions options,
            TestClientOutput output,
            TextReader input,
            CancellationToken cancellationToken)
        {
            Options = options;
            output.Write("fake.completed", "complete", phase: "test");
            return Task.FromResult(exitCode);
        }
    }
}