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

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

/// <summary>
/// Unit tests for ServerInfo model following TDD approach.
/// Tests server metadata representation.
/// </summary>
public class ServerInfoTests
{
    [Fact]
    public void ServerInfo_WithValidData_CreatesSuccessfully()
    {
        // Arrange
        var now = DateTime.UtcNow;

        // Act
        var serverInfo = new ServerInfo
        {
            Id = "test-server",
            Name = "Test Server",
            IsHealthy = true,
            LastHealthCheck = now,
            ResponseTime = TimeSpan.FromMilliseconds(50),
            Metadata = new Dictionary<string, string>
            {
                { "region", "us-east" },
                { "version", "1.0.0" }
            }
        };

        // Assert
        Assert.Equal("test-server", serverInfo.Id);
        Assert.Equal("Test Server", serverInfo.Name);
        Assert.True(serverInfo.IsHealthy);
        Assert.Equal(now, serverInfo.LastHealthCheck);
        Assert.Equal(50, serverInfo.ResponseTime?.TotalMilliseconds);
        Assert.NotNull(serverInfo.Metadata);
        Assert.Equal("us-east", serverInfo.Metadata["region"]);
    }

    [Fact]
    public void ServerInfo_DefaultState_HasEmptyId()
    {
        // Arrange & Act
        var serverInfo = new ServerInfo();

        // Assert
        Assert.Equal(string.Empty, serverInfo.Id);
        Assert.Equal(string.Empty, serverInfo.Name);
        Assert.False(serverInfo.IsHealthy);
        Assert.Null(serverInfo.LastHealthCheck);
        Assert.Null(serverInfo.ResponseTime);
        Assert.Null(serverInfo.Metadata);
    }

    [Fact]
    public void ServerInfo_WithMetadata_StoresCorrectly()
    {
        // Arrange & Act
        var serverInfo = new ServerInfo
        {
            Id = "metadata-test",
            Metadata = new Dictionary<string, string>
            {
                { "environment", "production" },
                { "datacenter", "dc1" }
            }
        };

        // Assert
        Assert.NotNull(serverInfo.Metadata);
        Assert.Equal(2, serverInfo.Metadata.Count);
        Assert.Equal("production", serverInfo.Metadata["environment"]);
        Assert.Equal("dc1", serverInfo.Metadata["datacenter"]);
    }
}