using Xunit;
using OpenHarbor.MCP.Gateway.Core.Configuration;

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

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

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

    [Fact]
    public void RoutingConfig_WithCustomStrategy_StoresCorrectly()
    {
        // Arrange & Act
        var config = new RoutingConfig
        {
            Strategy = "ToolBased",
            ToolMapping = new Dictionary<string, string>
            {
                { "search_*", "server-1" },
                { "get_*", "server-2" }
            }
        };

        // Assert
        Assert.Equal("ToolBased", config.Strategy);
        Assert.NotNull(config.ToolMapping);
        Assert.Equal(2, config.ToolMapping.Count);
    }

    [Fact]
    public void RoutingConfig_WithClientBasedStrategy_StoresClientMapping()
    {
        // Arrange & Act
        var config = new RoutingConfig
        {
            Strategy = "ClientBased",
            ClientMapping = new Dictionary<string, string>
            {
                { "web-client", "server-1" },
                { "mobile-client", "server-2" }
            }
        };

        // Assert
        Assert.Equal("ClientBased", config.Strategy);
        Assert.NotNull(config.ClientMapping);
        Assert.Equal("server-1", config.ClientMapping["web-client"]);
    }

    [Fact]
    public void RoutingConfig_WithRetrySettings_StoresCorrectly()
    {
        // Arrange & Act
        var config = new RoutingConfig
        {
            EnableRetry = true,
            MaxRetryAttempts = 3,
            RetryDelayMs = 1000
        };

        // Assert
        Assert.True(config.EnableRetry);
        Assert.Equal(3, config.MaxRetryAttempts);
        Assert.Equal(1000, config.RetryDelayMs);
    }

    [Fact]
    public void RoutingConfig_Validate_WithValidStrategy_ReturnsTrue()
    {
        // Arrange
        var config = new RoutingConfig
        {
            Strategy = "RoundRobin"
        };

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

        // Assert
        Assert.True(isValid);
    }

    [Fact]
    public void RoutingConfig_Validate_WithInvalidStrategy_ReturnsFalse()
    {
        // Arrange
        var config = new RoutingConfig
        {
            Strategy = "InvalidStrategy"
        };

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

        // Assert
        Assert.False(isValid);
    }

    [Fact]
    public void RoutingConfig_Validate_ToolBasedWithoutMapping_ReturnsFalse()
    {
        // Arrange
        var config = new RoutingConfig
        {
            Strategy = "ToolBased",
            ToolMapping = null
        };

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

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