using System.CommandLine;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Text.Json;
using ZB.MOM.WW.ScadaBridge.CLI.Commands;

namespace ZB.MOM.WW.ScadaBridge.CLI.Tests;

[Collection("Console")]
public class DeploymentDeadlineParityTests
{
    /// <summary>Verifies that every single-deployment CLI alias waits for a server reply beyond the ordinary 30-second deadline.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task EverySingleDeploymentAlias_WaitsForServerBeyondOrdinaryDeadline()
    {
        // Run the four independent loopback requests together: one 31-second window,
        // exercising the real commands and socket transport past the old 30-second cap.
        await Task.WhenAll(
            InvokeDelayed(["deploy", "instance", "--id", "1"], "MgmtDeployInstance"),
            InvokeDelayed(["instance", "deploy", "--id", "1"], "MgmtDeployInstance"),
            InvokeDelayed(["deploy", "artifacts", "--site-id", "1"], "MgmtDeployArtifacts"),
            InvokeDelayed(["site", "deploy-artifacts", "--site-id", "1"], "MgmtDeployArtifacts"));
    }

    private static async Task InvokeDelayed(string[] args, string expectedCommand)
    {
        using var deadline = new CancellationTokenSource(TimeSpan.FromSeconds(45));
        var listener = new TcpListener(IPAddress.Loopback, 0);
        listener.Start();
        try
        {
            var port = ((IPEndPoint)listener.LocalEndpoint).Port;
            var server = Task.Run(async () =>
            {
                using var client = await listener.AcceptTcpClientAsync(deadline.Token);
                await using var stream = client.GetStream();
                using var reader = new StreamReader(stream, Encoding.UTF8, leaveOpen: true);
                var length = 0;
                while (await reader.ReadLineAsync(deadline.Token) is { Length: > 0 } line)
                    if (line.StartsWith("Content-Length:", StringComparison.OrdinalIgnoreCase))
                        length = int.Parse(line[15..].Trim());
                var request = new char[length];
                var read = 0;
                while (read < length)
                {
                    var count = await reader.ReadAsync(request.AsMemory(read), deadline.Token);
                    if (count == 0) throw new EndOfStreamException();
                    read += count;
                }
                using var payload = JsonDocument.Parse(new string(request));
                Assert.Equal(expectedCommand, payload.RootElement.GetProperty("command").GetString());
                await Task.Delay(TimeSpan.FromSeconds(31), deadline.Token);
                // A zero-failure summary: the artifact-deploy aliases derive their exit code from
                // failureCount, so a bare "{}" would read as an invalid summary (exit 1).
                const string body = "{\"successCount\":1,\"failureCount\":0}";
                var reply = Encoding.ASCII.GetBytes(
                    $"HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {body.Length}\r\nConnection: close\r\n\r\n{body}");
                try { await stream.WriteAsync(reply, deadline.Token); }
                catch (IOException) { /* Old client closes at 30s; exit assertion diagnoses it. */ }
            }, deadline.Token);
            var root = new RootCommand();
            var url = new Option<string>("--url") { Recursive = true };
            var format = new Option<string>("--format") { Recursive = true };
            var user = new Option<string>("--username") { Recursive = true };
            var password = new Option<string>("--password") { Recursive = true };
            root.Add(url); root.Add(format); root.Add(user); root.Add(password);
            root.Add(DeployCommands.Build(url, format, user, password));
            root.Add(InstanceCommands.Build(url, format, user, password));
            root.Add(SiteCommands.Build(url, format, user, password));
            var result = root.Parse([.. args, "--url", $"http://127.0.0.1:{port}",
                "--username", "test", "--password", "test", "--format", "json"]);
            Assert.Empty(result.Errors);
            var exit = await result.InvokeAsync().WaitAsync(deadline.Token);
            await server;
            Assert.Equal(0, exit);
        }
        finally { listener.Stop(); }
    }
}