using System;
using System.Collections.Generic;
using Junction.Domain.Models;
using Xunit;

namespace Junction.Tests.Unit
{
    public class MachineTests
    {
        [Fact]
        public void Ctor_HoldsGenericConfigBag()
        {
            var id = Guid.NewGuid();
            var config = new Dictionary<string, string>
            {
                ["url"] = "http://host:5000",
                ["deviceName"] = "M1"
            };

            var m = new Machine(id, "Mill", "mtconnect", config, TimeSpan.FromSeconds(2));

            Assert.Equal(id, m.Id);
            Assert.Equal("Mill", m.Name);
            Assert.Equal("mtconnect", m.ProtocolId);
            Assert.Equal("http://host:5000", m.ConnectionConfig["url"]);
            Assert.Equal("M1", m.ConnectionConfig["deviceName"]);
            Assert.Equal(TimeSpan.FromSeconds(2), m.PollInterval);
        }

        [Fact]
        public void Ctor_NullConfig_DefaultsToEmptyNeverNull()
        {
            var m = new Machine(Guid.NewGuid(), "M", "p", null, TimeSpan.Zero);

            Assert.NotNull(m.ConnectionConfig);
            Assert.Empty(m.ConnectionConfig);
        }

        [Fact]
        public void Ctor_NullStrings_DefaultToEmpty()
        {
            var m = new Machine(Guid.NewGuid(), null!, null!, null, TimeSpan.Zero);

            Assert.Equal("", m.Name);
            Assert.Equal("", m.ProtocolId);
        }

        [Fact]
        public void Properties_AreGetOnly()
        {
            var props = typeof(Machine).GetProperties();
            Assert.All(props, p => Assert.Null(p.SetMethod));
        }

        [Fact]
        public void With_OverridesGivenFields_KeepsRest()
        {
            var id = Guid.NewGuid();
            var m = new Machine(id, "Mill", "mtconnect", null, TimeSpan.FromSeconds(1));

            var updated = m.With(name: "Lathe", pollInterval: TimeSpan.FromSeconds(5));

            Assert.Equal(id, updated.Id);
            Assert.Equal("Lathe", updated.Name);
            Assert.Equal("mtconnect", updated.ProtocolId);
            Assert.Equal(TimeSpan.FromSeconds(5), updated.PollInterval);
            // original unchanged (immutable)
            Assert.Equal("Mill", m.Name);
            Assert.Equal(TimeSpan.FromSeconds(1), m.PollInterval);
        }
    }
}