using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using StellaOps.Scanner.WebService.Options;
using StellaOps.Scanner.WebService.Services;

namespace StellaOps.Scanner.WebService.Tests;

public sealed class PlatformEventPublisherRegistrationTests
{
    [Fact]
    public void NullPublisherRegisteredWhenEventsDisabled()
    {
        using var factory = new ScannerApplicationFactory(configuration =>
        {
            configuration["scanner:events:enabled"] = "false";
            configuration["scanner:events:dsn"] = string.Empty;
        });
        using var scope = factory.Services.CreateScope();

        var publisher = scope.ServiceProvider.GetRequiredService<IPlatformEventPublisher>();
        Assert.IsType<NullPlatformEventPublisher>(publisher);
    }

    [Fact]
    public void RedisPublisherRegisteredWhenEventsEnabled()
    {
        var originalEnabled = Environment.GetEnvironmentVariable("SCANNER__EVENTS__ENABLED");
        var originalDriver = Environment.GetEnvironmentVariable("SCANNER__EVENTS__DRIVER");
        var originalDsn = Environment.GetEnvironmentVariable("SCANNER__EVENTS__DSN");
        var originalStream = Environment.GetEnvironmentVariable("SCANNER__EVENTS__STREAM");
        var originalTimeout = Environment.GetEnvironmentVariable("SCANNER__EVENTS__PUBLISHTIMEOUTSECONDS");
        var originalMax = Environment.GetEnvironmentVariable("SCANNER__EVENTS__MAXSTREAMLENGTH");

        Environment.SetEnvironmentVariable("SCANNER__EVENTS__ENABLED", "true");
        Environment.SetEnvironmentVariable("SCANNER__EVENTS__DRIVER", "redis");
        Environment.SetEnvironmentVariable("SCANNER__EVENTS__DSN", "localhost:6379");
        Environment.SetEnvironmentVariable("SCANNER__EVENTS__STREAM", "stella.events.tests");
        Environment.SetEnvironmentVariable("SCANNER__EVENTS__PUBLISHTIMEOUTSECONDS", "1");
        Environment.SetEnvironmentVariable("SCANNER__EVENTS__MAXSTREAMLENGTH", "100");

        try
        {
            using var factory = new ScannerApplicationFactory(configuration =>
            {
                configuration["scanner:events:enabled"] = "true";
                configuration["scanner:events:driver"] = "redis";
                configuration["scanner:events:dsn"] = "localhost:6379";
                configuration["scanner:events:stream"] = "stella.events.tests";
                configuration["scanner:events:publishTimeoutSeconds"] = "1";
                configuration["scanner:events:maxStreamLength"] = "100";
            });
            using var scope = factory.Services.CreateScope();

            var options = scope.ServiceProvider.GetRequiredService<IOptions<ScannerWebServiceOptions>>().Value;
            Assert.True(options.Events.Enabled);
            Assert.Equal("redis", options.Events.Driver);

            var publisher = scope.ServiceProvider.GetRequiredService<IPlatformEventPublisher>();
            Assert.IsType<RedisPlatformEventPublisher>(publisher);
        }
        finally
        {
            Environment.SetEnvironmentVariable("SCANNER__EVENTS__ENABLED", originalEnabled);
            Environment.SetEnvironmentVariable("SCANNER__EVENTS__DRIVER", originalDriver);
            Environment.SetEnvironmentVariable("SCANNER__EVENTS__DSN", originalDsn);
            Environment.SetEnvironmentVariable("SCANNER__EVENTS__STREAM", originalStream);
            Environment.SetEnvironmentVariable("SCANNER__EVENTS__PUBLISHTIMEOUTSECONDS", originalTimeout);
            Environment.SetEnvironmentVariable("SCANNER__EVENTS__MAXSTREAMLENGTH", originalMax);
        }
    }
}