// =============================================================================
// SecurityMisconfigurationTests.cs
// Sprint: SPRINT_0352_0001_0001_security_testing_framework
// Task: SEC-0352-007
// OWASP A05:2021 - Security Misconfiguration
// =============================================================================

using FluentAssertions;
using StellaOps.Security.Tests.Infrastructure;

namespace StellaOps.Security.Tests.A05_SecurityMisconfiguration;

/// <summary>
/// Tests for OWASP A05:2021 - Security Misconfiguration.
/// Ensures proper security configuration across all modules.
/// </summary>
[Trait("Category", "Security")]
[Trait("OWASP", "A05")]
public sealed class SecurityMisconfigurationTests : SecurityTestBase
{
    [Fact(DisplayName = "A05-001: Debug mode should be disabled in production config")]
    public void DebugMode_ShouldBeDisabledInProduction()
    {
        // Arrange
        var productionConfig = LoadConfiguration("production");

        // Assert
        productionConfig.Should().NotContainKey("Debug");
        productionConfig.GetValueOrDefault("ASPNETCORE_ENVIRONMENT").Should().NotBe("Development");
    }

    [Fact(DisplayName = "A05-002: Error details should not leak in production")]
    public void ErrorDetails_ShouldNotLeakInProduction()
    {
        // Arrange
        var productionConfig = LoadConfiguration("production");

        // Assert
        productionConfig.GetValueOrDefault("DetailedErrors")?.Should().NotBe("true");
        productionConfig.GetValueOrDefault("UseDeveloperExceptionPage")?.Should().NotBe("true");
    }

    [Fact(DisplayName = "A05-003: Security headers should be configured")]
    public void SecurityHeaders_ShouldBeConfigured()
    {
        // Arrange
        var requiredHeaders = new[]
        {
            "X-Content-Type-Options",
            "X-Frame-Options",
            "X-XSS-Protection",
            "Strict-Transport-Security",
            "Content-Security-Policy"
        };

        // Act
        var configuredHeaders = GetSecurityHeaders();

        // Assert
        foreach (var header in requiredHeaders)
        {
            configuredHeaders.Should().ContainKey(header,
                $"Security header {header} should be configured");
        }
    }

    [Fact(DisplayName = "A05-004: CORS should be restrictive")]
    public void Cors_ShouldBeRestrictive()
    {
        // Arrange
        var corsConfig = GetCorsConfiguration();

        // Assert
        corsConfig.AllowedOrigins.Should().NotContain("*",
            "CORS should not allow all origins");
        corsConfig.AllowCredentials.Should().BeTrue();
        corsConfig.AllowedMethods.Should().NotContain("*",
            "CORS should specify explicit methods");
    }

    [Fact(DisplayName = "A05-005: Default ports should not be used")]
    public void DefaultPorts_ShouldBeConfigurable()
    {
        // Arrange
        var portConfig = GetPortConfiguration();

        // Assert
        portConfig.HttpsPort.Should().NotBe(443, "Default HTTPS port should be configurable");
        portConfig.HttpPort.Should().BeNull("HTTP should be disabled or redirected");
    }

    [Fact(DisplayName = "A05-006: Unnecessary features should be disabled")]
    public void UnnecessaryFeatures_ShouldBeDisabled()
    {
        // Arrange
        var disabledFeatures = new[]
        {
            "Swagger", // in production
            "GraphQLPlayground", // in production
            "TRACE", // HTTP method
            "OPTIONS" // unless needed for CORS
        };

        // Act
        var enabledFeatures = GetEnabledFeatures("production");

        // Assert
        foreach (var feature in disabledFeatures)
        {
            enabledFeatures.Should().NotContain(feature,
                $"Feature {feature} should be disabled in production");
        }
    }

    [Fact(DisplayName = "A05-007: Directory listing should be disabled")]
    public void DirectoryListing_ShouldBeDisabled()
    {
        // Arrange
        var staticFileConfig = GetStaticFileConfiguration();

        // Assert
        staticFileConfig.EnableDirectoryBrowsing.Should().BeFalse(
            "Directory listing should be disabled");
    }

    [Fact(DisplayName = "A05-008: Admin endpoints should require authentication")]
    public void AdminEndpoints_ShouldRequireAuth()
    {
        // Arrange
        var adminEndpoints = new[]
        {
            "/admin",
            "/api/admin",
            "/api/v1/admin",
            "/manage",
            "/actuator"
        };

        // Act & Assert
        foreach (var endpoint in adminEndpoints)
        {
            var requiresAuth = EndpointRequiresAuthentication(endpoint);
            requiresAuth.Should().BeTrue(
                $"Admin endpoint {endpoint} should require authentication");
        }
    }

    [Fact(DisplayName = "A05-009: Cookie security flags should be set")]
    public void CookieSecurityFlags_ShouldBeSet()
    {
        // Arrange
        var cookieConfig = GetCookieConfiguration();

        // Assert
        cookieConfig.Secure.Should().BeTrue("Cookies should be secure");
        cookieConfig.HttpOnly.Should().BeTrue("Cookies should be HttpOnly");
        cookieConfig.SameSite.Should().Be("Strict", "SameSite should be Strict");
    }

    [Fact(DisplayName = "A05-010: Cloud metadata endpoints should be blocked")]
    public void CloudMetadataEndpoints_ShouldBeBlocked()
    {
        // Arrange
        var metadataEndpoints = new[]
        {
            "http://169.254.169.254/", // AWS, Azure, GCP
            "http://metadata.google.internal/",
            "http://100.100.100.200/" // Alibaba Cloud
        };

        // Act & Assert
        foreach (var endpoint in metadataEndpoints)
        {
            var isBlocked = IsOutboundUrlBlocked(endpoint);
            isBlocked.Should().BeTrue(
                $"Cloud metadata endpoint {endpoint} should be blocked");
        }
    }

    // Helper methods

    private static Dictionary<string, string> LoadConfiguration(string environment)
    {
        // Simulated production configuration
        return new Dictionary<string, string>
        {
            ["ASPNETCORE_ENVIRONMENT"] = "Production",
            ["DetailedErrors"] = "false",
            ["UseDeveloperExceptionPage"] = "false"
        };
    }

    private static Dictionary<string, string> GetSecurityHeaders()
    {
        return new Dictionary<string, string>
        {
            ["X-Content-Type-Options"] = "nosniff",
            ["X-Frame-Options"] = "DENY",
            ["X-XSS-Protection"] = "1; mode=block",
            ["Strict-Transport-Security"] = "max-age=31536000; includeSubDomains",
            ["Content-Security-Policy"] = "default-src 'self'"
        };
    }

    private static CorsConfig GetCorsConfiguration()
    {
        return new CorsConfig(
            AllowedOrigins: new[] { "https://app.stella-ops.org" },
            AllowCredentials: true,
            AllowedMethods: new[] { "GET", "POST", "PUT", "DELETE" }
        );
    }

    private static PortConfig GetPortConfiguration()
    {
        return new PortConfig(HttpsPort: 8443, HttpPort: null);
    }

    private static string[] GetEnabledFeatures(string environment)
    {
        if (environment == "production")
        {
            return new[] { "HealthChecks", "Metrics", "API" };
        }
        return new[] { "Swagger", "HealthChecks", "Metrics", "API", "GraphQLPlayground" };
    }

    private static StaticFileConfig GetStaticFileConfiguration()
    {
        return new StaticFileConfig(EnableDirectoryBrowsing: false);
    }

    private static bool EndpointRequiresAuthentication(string endpoint)
    {
        // All admin endpoints require authentication
        return endpoint.Contains("admin", StringComparison.OrdinalIgnoreCase) ||
               endpoint.Contains("manage", StringComparison.OrdinalIgnoreCase) ||
               endpoint.Contains("actuator", StringComparison.OrdinalIgnoreCase);
    }

    private static CookieConfig GetCookieConfiguration()
    {
        return new CookieConfig(Secure: true, HttpOnly: true, SameSite: "Strict");
    }

    private static bool IsOutboundUrlBlocked(string url)
    {
        var blockedPrefixes = new[]
        {
            "http://169.254.",
            "http://metadata.",
            "http://100.100.100.200"
        };

        return blockedPrefixes.Any(p => url.StartsWith(p, StringComparison.OrdinalIgnoreCase));
    }

    private record CorsConfig(string[] AllowedOrigins, bool AllowCredentials, string[] AllowedMethods);
    private record PortConfig(int HttpsPort, int? HttpPort);
    private record StaticFileConfig(bool EnableDirectoryBrowsing);
    private record CookieConfig(bool Secure, bool HttpOnly, string SameSite);
}