using Eis.Infrastructure.Administration;

namespace Eis.Infrastructure.Tests.Administration;

public sealed class AdminMigrationOptionsTests
{
    [Fact]
    public void DisabledByDefault()
    {
        WithEnvironment(null, null, () =>
        {
            var options = AdminMigrationOptions.FromEnvironment(
                configuredNativeReadsEnabled: false,
                authenticationNativeEnabled: false,
                sharesLegacySessions: false);

            Assert.False(options.NativeReadsEnabled);
        });
    }

    [Fact]
    public void RequiresNativeAuthentication()
    {
        WithEnvironment("true", "true", () =>
        {
            var exception = Assert.Throws<InvalidOperationException>(() =>
                AdminMigrationOptions.FromEnvironment(
                    configuredNativeReadsEnabled: false,
                    authenticationNativeEnabled: false,
                    sharesLegacySessions: false));

            Assert.Contains("AUTH_NATIVE_ENABLED=true", exception.Message);
        });
    }

    [Fact]
    public void RequiresSharedSessionsOutsideIsolatedTests()
    {
        WithEnvironment("true", null, () =>
        {
            var exception = Assert.Throws<InvalidOperationException>(() =>
                AdminMigrationOptions.FromEnvironment(
                    configuredNativeReadsEnabled: false,
                    authenticationNativeEnabled: true,
                    sharesLegacySessions: false));

            Assert.Contains("Redis", exception.Message);
        });
    }

    [Fact]
    public void AllowsSharedRedisSessions()
    {
        WithEnvironment("true", null, () =>
        {
            var options = AdminMigrationOptions.FromEnvironment(
                configuredNativeReadsEnabled: false,
                authenticationNativeEnabled: true,
                sharesLegacySessions: true);

            Assert.True(options.NativeReadsEnabled);
        });
    }

    private static void WithEnvironment(
        string? nativeReadsEnabled,
        string? allowMemory,
        Action test)
    {
        var previousNativeReadsEnabled = Environment.GetEnvironmentVariable("ADMIN_NATIVE_READS_ENABLED");
        var previousAllowMemory = Environment.GetEnvironmentVariable("ADMIN_NATIVE_ALLOW_MEMORY");
        try
        {
            Environment.SetEnvironmentVariable("ADMIN_NATIVE_READS_ENABLED", nativeReadsEnabled);
            Environment.SetEnvironmentVariable("ADMIN_NATIVE_ALLOW_MEMORY", allowMemory);
            test();
        }
        finally
        {
            Environment.SetEnvironmentVariable("ADMIN_NATIVE_READS_ENABLED", previousNativeReadsEnabled);
            Environment.SetEnvironmentVariable("ADMIN_NATIVE_ALLOW_MEMORY", previousAllowMemory);
        }
    }
}