using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.Extensions.Configuration;

namespace ScadaLink.Host.Tests;

/// <summary>
/// WP-12: Tests for /health/ready endpoint.
/// </summary>
public class HealthCheckTests : IDisposable
{
    private readonly List<IDisposable> _disposables = new();

    public void Dispose()
    {
        foreach (var d in _disposables)
        {
            try { d.Dispose(); } catch { /* best effort */ }
        }
    }

    [Fact]
    public async Task HealthReady_Endpoint_ReturnsResponse()
    {
        var previousEnv = Environment.GetEnvironmentVariable("DOTNET_ENVIRONMENT");
        try
        {
            Environment.SetEnvironmentVariable("DOTNET_ENVIRONMENT", "Central");

            var factory = new WebApplicationFactory<Program>()
                .WithWebHostBuilder(builder =>
                {
                    builder.ConfigureAppConfiguration((context, config) =>
                    {
                        config.AddInMemoryCollection(new Dictionary<string, string?>
                        {
                            ["ScadaLink:Node:NodeHostname"] = "localhost",
                            ["ScadaLink:Node:RemotingPort"] = "0",
                            ["ScadaLink:Cluster:SeedNodes:0"] = "akka.tcp://scadalink@localhost:2551",
                            ["ScadaLink:Cluster:SeedNodes:1"] = "akka.tcp://scadalink@localhost:2552",
                            ["ScadaLink:Database:SkipMigrations"] = "true",
                        });
                    });
                    builder.UseSetting("ScadaLink:Node:Role", "Central");
                    builder.UseSetting("ScadaLink:Database:SkipMigrations", "true");
                });
            _disposables.Add(factory);

            var client = factory.CreateClient();
            _disposables.Add(client);

            var response = await client.GetAsync("/health/ready");

            // The endpoint exists and returns a status code.
            // With test infrastructure (no real DB), the database check may fail,
            // so we accept either 200 (Healthy) or 503 (Unhealthy).
            Assert.True(
                response.StatusCode == System.Net.HttpStatusCode.OK ||
                response.StatusCode == System.Net.HttpStatusCode.ServiceUnavailable,
                $"Expected 200 or 503, got {(int)response.StatusCode}");
        }
        finally
        {
            Environment.SetEnvironmentVariable("DOTNET_ENVIRONMENT", previousEnv);
        }
    }
}