using Xunit;
using Svrnty.MCP.Gateway.Core.Configuration;
using Svrnty.MCP.Gateway.Core.Models;

namespace Svrnty.MCP.Gateway.Core.Tests.Configuration;

/// <summary>
/// Unit tests for GatewayConfig following TDD approach.
/// Tests gateway configuration and validation.
/// </summary>
public class GatewayConfigTests
{
    [Fact]
    public void GatewayConfig_WithDefaultValues_CreatesSuccessfully()
    {
        // Arrange & Act
        var config = new GatewayConfig();

        // Assert
        Assert.NotNull(config);
        Assert.NotNull(config.Servers);
        Assert.Empty(config.Servers);
        Assert.NotNull(config.Routing);
        Assert.NotNull(config.Security);
    }

    [Fact]
    public void GatewayConfig_WithServers_StoresCorrectly()
    {
        // Arrange & Act
        var config = new GatewayConfig
        {
            Servers = new List<ServerConfig>
            {
                new ServerConfig { Id = "server-1", Name = "Server 1" },
                new ServerConfig { Id = "server-2", Name = "Server 2" }
            }
        };

        // Assert
        Assert.Equal(2, config.Servers.Count);
        Assert.Contains(config.Servers, s => s.Id == "server-1");
        Assert.Contains(config.Servers, s => s.Id == "server-2");
    }

    [Fact]
    public void GatewayConfig_WithRoutingConfig_StoresCorrectly()
    {
        // Arrange & Act
        var routingConfig = new RoutingConfig { Strategy = "RoundRobin" };
        var config = new GatewayConfig
        {
            Routing = routingConfig
        };

        // Assert
        Assert.NotNull(config.Routing);
        Assert.Equal("RoundRobin", config.Routing.Strategy);
    }

    [Fact]
    public void GatewayConfig_WithSecurityConfig_StoresCorrectly()
    {
        // Arrange & Act
        var securityConfig = new SecurityConfig { EnableAuthentication = true };
        var config = new GatewayConfig
        {
            Security = securityConfig
        };

        // Assert
        Assert.NotNull(config.Security);
        Assert.True(config.Security.EnableAuthentication);
    }

    [Fact]
    public void GatewayConfig_Validate_WithValidConfig_ReturnsTrue()
    {
        // Arrange
        var config = new GatewayConfig
        {
            Servers = new List<ServerConfig>
            {
                new ServerConfig { Id = "server-1", Name = "Server 1", TransportType = "Stdio" }
            },
            Routing = new RoutingConfig { Strategy = "RoundRobin" },
            Security = new SecurityConfig { EnableAuthentication = false }
        };

        // Act
        var isValid = config.Validate();

        // Assert
        Assert.True(isValid);
    }

    [Fact]
    public void GatewayConfig_Validate_WithEmptyServers_ReturnsFalse()
    {
        // Arrange
        var config = new GatewayConfig
        {
            Servers = new List<ServerConfig>(),
            Routing = new RoutingConfig { Strategy = "RoundRobin" }
        };

        // Act
        var isValid = config.Validate();

        // Assert
        Assert.False(isValid);
    }
}