using Xunit;
using OpenHarbor.MCP.Core.Models;

namespace OpenHarbor.MCP.Core.Tests.Models;

/// <summary>
/// Unit tests for ServerHealthStatus model following TDD approach.
/// Tests server health representation.
/// </summary>
public class ServerHealthStatusTests
{
    [Fact]
    public void ServerHealthStatus_Healthy_CreatesSuccessfully()
    {
        // Arrange
        var now = DateTime.UtcNow;

        // Act
        var status = new ServerHealthStatus
        {
            ServerId = "server-1",
            ServerName = "Test Server",
            IsHealthy = true,
            LastCheck = now,
            ResponseTime = TimeSpan.FromMilliseconds(25)
        };

        // Assert
        Assert.Equal("server-1", status.ServerId);
        Assert.Equal("Test Server", status.ServerName);
        Assert.True(status.IsHealthy);
        Assert.Equal(now, status.LastCheck);
        Assert.Equal(25, status.ResponseTime?.TotalMilliseconds);
        Assert.Null(status.ErrorMessage);
    }

    [Fact]
    public void ServerHealthStatus_Unhealthy_IncludesErrorMessage()
    {
        // Arrange & Act
        var status = new ServerHealthStatus
        {
            ServerId = "server-2",
            IsHealthy = false,
            LastCheck = DateTime.UtcNow,
            ErrorMessage = "Connection timeout"
        };

        // Assert
        Assert.False(status.IsHealthy);
        Assert.Equal("Connection timeout", status.ErrorMessage);
        Assert.Null(status.ResponseTime);
    }

    [Fact]
    public void ServerHealthStatus_DefaultState_IsNotHealthy()
    {
        // Arrange & Act
        var status = new ServerHealthStatus();

        // Assert
        Assert.False(status.IsHealthy);
        Assert.Null(status.ErrorMessage);
        Assert.Null(status.ResponseTime);
    }
}