using System;
using NUnit.Framework;
using Moq;
using NcProgramManager.Cnc;
using NcProgramManager.Cnc.Models;
using NcProgramManager.Cnc.Mitsubishi;

namespace NcProgramManager.Tests.Unit
{
    [TestFixture]
    public class MitsubishiMachineTests
    {
        private MitsubishiConnectionConfig _config;
        private Mock<IMitsubishiFtpClient> _ftpMock;
        private Mock<INcProgramValidator> _validatorMock;
        private MitsubishiMachine _machine;

        [SetUp]
        public void SetUp()
        {
            _config = new MitsubishiConnectionConfig
            {
                Name = "TestMitsubishi",
                IpAddress = "192.168.1.3",
                Port = 21,
                ProgramDirectory = "/PRG/"
            };
            _ftpMock = new Mock<IMitsubishiFtpClient>(MockBehavior.Strict);
            // Always-ok validator so existing write tests are not affected by validation rules
            _validatorMock = new Mock<INcProgramValidator>();
            _validatorMock.Setup(v => v.Validate(It.IsAny<string>(), It.IsAny<string>()))
                          .Returns(ValidationResult.Ok());
            _machine = new MitsubishiMachine(_config, _ftpMock.Object, _validatorMock.Object);
        }

        [TearDown]
        public void TearDown()
        {
            _machine?.Dispose();
        }

        // ConnectAsync

        [Test]
        public void ConnectAsync_PingTrue_StateConnectedAndResultOk()
        {
            _ftpMock.Setup(f => f.Ping()).Returns(true);

            var result = _machine.ConnectAsync().GetAwaiter().GetResult();

            Assert.That(result.Success, Is.True);
            Assert.That(_machine.State, Is.EqualTo(ConnectionState.Connected));
        }

        [Test]
        public void ConnectAsync_PingFalse_StateFaultedAndResultFail()
        {
            _ftpMock.Setup(f => f.Ping()).Returns(false);

            var result = _machine.ConnectAsync().GetAwaiter().GetResult();

            Assert.That(result.Success, Is.False);
            Assert.That(_machine.State, Is.EqualTo(ConnectionState.Faulted));
        }

        // ReadProgramAsync — no .MPF extension for Mitsubishi

        [Test]
        public void ReadProgramAsync_FullPath_CallsDownloadFileNoExtension()
        {
            _ftpMock.Setup(f => f.Ping()).Returns(true);
            _ftpMock.Setup(f => f.DownloadFile("/PRG/O1234")).Returns("NC_DATA");
            _machine.ConnectAsync().GetAwaiter().GetResult();

            var result = _machine.ReadProgramAsync("/PRG/O1234").GetAwaiter().GetResult();

            Assert.That(result.Success, Is.True);
            Assert.That(result.Value, Is.EqualTo("NC_DATA"));
            _ftpMock.Verify(f => f.DownloadFile("/PRG/O1234"), Times.Once);
        }

        [Test]
        public void ReadProgramAsync_ShortName_ResolvesWithDirectoryNoExtension()
        {
            _ftpMock.Setup(f => f.Ping()).Returns(true);
            _ftpMock.Setup(f => f.DownloadFile("/PRG/O1234")).Returns("DATA");
            _machine.ConnectAsync().GetAwaiter().GetResult();

            _machine.ReadProgramAsync("O1234").GetAwaiter().GetResult();

            // Must NOT append .MPF
            _ftpMock.Verify(f => f.DownloadFile("/PRG/O1234"), Times.Once);
            _ftpMock.Verify(f => f.DownloadFile(It.Is<string>(s => s.EndsWith(".MPF"))), Times.Never);
        }

        // WriteProgramAsync

        [Test]
        public void WriteProgramAsync_FullPath_CallsUploadFileNoExtension()
        {
            // ISS-020: write resolves the path identically to read (path = program
            // identifier / full path, not a directory combined with program.Name).
            _ftpMock.Setup(f => f.Ping()).Returns(true);
            _ftpMock.Setup(f => f.UploadFile("/PRG/O1234", "CONTENT"));
            _machine.ConnectAsync().GetAwaiter().GetResult();

            var prog = new CncProgram { Name = "O1234", Content = "CONTENT" };
            var result = _machine.WriteProgramAsync("/PRG/O1234", prog).GetAwaiter().GetResult();

            Assert.That(result.Success, Is.True);
            _ftpMock.Verify(f => f.UploadFile("/PRG/O1234", "CONTENT"), Times.Once);
            _ftpMock.Verify(f => f.UploadFile(It.Is<string>(s => s.EndsWith(".MPF")), It.IsAny<string>()), Times.Never);
        }

        [Test]
        public void WriteProgramAsync_ShortName_ResolvesWithDirectory_SymmetricWithRead()
        {
            // ISS-020 regression: -path "1" must write to ProgramDirectory + "1"
            // (the same location ReadProgramAsync("1") reads), so roundtrip works.
            _ftpMock.Setup(f => f.Ping()).Returns(true);
            _ftpMock.Setup(f => f.UploadFile("/PRG/1", "CONTENT"));
            _machine.ConnectAsync().GetAwaiter().GetResult();

            var prog = new CncProgram { Name = "O0001", Content = "CONTENT" };
            var result = _machine.WriteProgramAsync("1", prog).GetAwaiter().GetResult();

            Assert.That(result.Success, Is.True);
            _ftpMock.Verify(f => f.UploadFile("/PRG/1", "CONTENT"), Times.Once);
        }

        [Test]
        public void WriteProgramAsync_EmptyContent_FailsWithoutCallingUploadFile()
        {
            _ftpMock.Setup(f => f.Ping()).Returns(true);
            _machine.ConnectAsync().GetAwaiter().GetResult();

            var prog = new CncProgram { Name = "O1234", Content = "" };
            var result = _machine.WriteProgramAsync("/PRG/", prog).GetAwaiter().GetResult();

            Assert.That(result.Success, Is.False);
            _ftpMock.Verify(f => f.UploadFile(It.IsAny<string>(), It.IsAny<string>()), Times.Never);
        }

        [Test]
        public void WriteProgramAsync_NullProgram_FailsWithoutCallingUploadFile()
        {
            _ftpMock.Setup(f => f.Ping()).Returns(true);
            _machine.ConnectAsync().GetAwaiter().GetResult();

            var result = _machine.WriteProgramAsync("/PRG/", null).GetAwaiter().GetResult();

            Assert.That(result.Success, Is.False);
            _ftpMock.Verify(f => f.UploadFile(It.IsAny<string>(), It.IsAny<string>()), Times.Never);
        }

        // DeleteProgramAsync

        [Test]
        public void DeleteProgramAsync_ValidPath_CallsDeleteFile()
        {
            _ftpMock.Setup(f => f.Ping()).Returns(true);
            _ftpMock.Setup(f => f.DeleteFile("/PRG/O1234"));
            _machine.ConnectAsync().GetAwaiter().GetResult();

            var result = _machine.DeleteProgramAsync("/PRG/O1234").GetAwaiter().GetResult();

            Assert.That(result.Success, Is.True);
            _ftpMock.Verify(f => f.DeleteFile("/PRG/O1234"), Times.Once);
        }

        // ReadActiveProgramAsync

        [Test]
        public void ReadActiveProgramAsync_ReturnsFailNotSupported()
        {
            var result = _machine.ReadActiveProgramAsync().GetAwaiter().GetResult();

            Assert.That(result.Success, Is.False);
        }
    }
}