using Xunit;
using Moq;
using EmployeeManagmentBusinessLogic.BusinessLogic;
using EmployeeManagmentContracts.ViewModels;
using EmployeeManagmentContracts.SearchModels;
using EmployeeManagmentContracts.StoragesContracts;
using Microsoft.Extensions.Logging;

namespace EmployeeManagmentTests.Unit
{
    public class EmployeeLogicTests
    {
        private readonly Mock<IEmployeeStorage> _mockStorage;
        private readonly Mock<ILogger<EmployeeLogic>> _mockLogger;
        private readonly EmployeeLogic _logic;

        public EmployeeLogicTests()
        {
            _mockStorage = new Mock<IEmployeeStorage>();
            _mockLogger = new Mock<ILogger<EmployeeLogic>>();
            _logic = new EmployeeLogic(_mockLogger.Object, _mockStorage.Object);
        }

        [Fact]
        public void GetFullList_ShouldReturnListOfEmployees()
        {
            // Arrange
            var expectedList = new List<EmployeeViewModel>
            {
                new EmployeeViewModel { Id = 1, NameJob = "Developer", StartJob = DateTime.Now.AddYears(-1) },
                new EmployeeViewModel { Id = 2, NameJob = "Manager", StartJob = DateTime.Now.AddYears(-2) }
            };

            _mockStorage.Setup(x => x.GetFullList()).Returns(expectedList);

            // Act
            var result = _logic.GetFullList();

            // Assert
            Assert.Equal(expectedList.Count, result.Count);
            Assert.Equal(expectedList[0].NameJob, result[0].NameJob);
        }

        [Fact]
        public void GetFilteredList_ShouldReturnFilteredResults()
        {
            // Arrange
            var model = new EmployeeSearchModel { NameJob = "Developer" };
            var expectedList = new List<EmployeeViewModel>
            {
                new EmployeeViewModel { Id = 1, NameJob = "Developer", StartJob = DateTime.Now.AddYears(-1) }
            };

            _mockStorage.Setup(x => x.GetFilteredList(model)).Returns(expectedList);

            // Act
            var result = _logic.GetFilteredList(model);

            // Assert
            Assert.Single(result);
            Assert.Equal("Developer", result[0].NameJob);
        }

        [Fact]
        public void GetFilteredList_ShouldReturnEmptyList_IfNoMatch()
        {
            // Arrange
            var model = new EmployeeSearchModel { NameJob = "Unknown" };
            _mockStorage.Setup(x => x.GetFilteredList(model)).Returns(new List<EmployeeViewModel>());

            // Act
            var result = _logic.GetFilteredList(model);

            // Assert
            Assert.Empty(result);
        }

        [Fact]
        public void Insert_ShouldThrowException_IfNameJobIsEmpty()
        {
            // Arrange
            var invalidModel = new EmployeeViewModel { NameJob = "" };

            // Act & Assert
            Assert.Throws<ArgumentException>(() => _logic.Insert(invalidModel));
        }

        [Fact]
        public void Insert_ShouldCallStorageInsert_IfDataIsValid()
        {
            // Arrange
            var validModel = new EmployeeViewModel { NameJob = "Developer", StartJob = DateTime.Now };

            // Act
            _logic.Insert(validModel);

            // Assert
            _mockStorage.Verify(x => x.Insert(validModel), Times.Once);
        }

        [Fact]
        public void Update_ShouldThrowException_IfElementNotFound()
        {
            // Arrange
            var model = new EmployeeViewModel { Id = 1, NameJob = "Developer" };
            _mockStorage.Setup(x => x.GetElement(model.Id)).Returns((EmployeeViewModel?)null);

            // Act & Assert
            Assert.Throws<ArgumentException>(() => _logic.Update(model));
        }

        [Fact]
        public void Delete_ShouldThrowException_IfElementNotFound()
        {
            // Arrange
            var id = 1;
            _mockStorage.Setup(x => x.GetElement(id)).Returns((EmployeeViewModel?)null);

            // Act & Assert
            Assert.Throws<ArgumentException>(() => _logic.Delete(id));
        }

        [Fact]
        public void Delete_ShouldCallStorageDelete_IfElementExists()
        {
            // Arrange
            var id = 1;
            var model = new EmployeeViewModel { Id = id };
            _mockStorage.Setup(x => x.GetElement(id)).Returns(model);

            // Act
            _logic.Delete(id);

            // Assert
            _mockStorage.Verify(x => x.Delete(id), Times.Once);
        }
    }
}