using qdr.app.studiou.orders2printpack.EmailStorage;
using System.IO.Abstractions.TestingHelpers;

namespace Test
{
   [TestFixture]
    public class EmailItemTests
    {
        private MockFileSystem _mockFileSystem;
        private string _basePath;
        private MetadataItem _testMetadata;

        [SetUp]
        public void SetUp()
        {
            _mockFileSystem = new MockFileSystem();
            _basePath = @"C:\TestBase";
            
            _testMetadata = new MetadataItem
            {
                DirectoryName = "test_user_at_example_dot_com",
                EmailAddress = "test.user@example.com",
                State = EmailStateEnum.Ready,
                Subject = "Test Subject",
                Body = "Test Body",
                FileNameAttachment = "test_attachment.zip",
                SizeAttachment = 1024,
                InternalFilesCount = 3,
                Orders = "1001,1002,1003"
            };

            // Create base directory
            _mockFileSystem.AddDirectory(_basePath);
        }

        #region Constructor Tests

        [Test]
        public void Constructor_WithValidParameters_ShouldInitializeCorrectly()
        {
            // Act
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Assert
            Assert.That(emailItem.Metadata, Is.EqualTo(_testMetadata));
            Assert.That(emailItem.DirectoryPath, Is.EqualTo(Path.Combine(_basePath, _testMetadata.DirectoryName)));
        }

        [Test]
        public void Constructor_WithNullMetadata_ShouldThrowArgumentNullException()
        {
            // Act & Assert
            var ex = Assert.Throws<ArgumentNullException>(() => new EmailItem(null, _basePath, _mockFileSystem));
            Assert.That(ex.ParamName, Is.EqualTo("metadata"));
        }

        [Test]
        public void Constructor_WithNullBasePath_ShouldThrowArgumentNullException()
        {
            // Act & Assert
            var ex = Assert.Throws<ArgumentNullException>(() => new EmailItem(_testMetadata, null, _mockFileSystem));
            Assert.That(ex.ParamName, Is.EqualTo("basePath"));
        }

        #endregion

        #region Property Tests

        [Test]
        public void DirectoryPath_ShouldCombineBasePathWithDirectoryName()
        {
            // Arrange
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);
            var expectedPath = Path.Combine(_basePath, _testMetadata.DirectoryName);

            // Act & Assert
            Assert.That(emailItem.DirectoryPath, Is.EqualTo(expectedPath));
        }

        [Test]
        public void DirectoryExists_WhenDirectoryExists_ShouldReturnTrue()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.DirectoryExists, Is.True);
        }

        [Test]
        public void DirectoryExists_WhenDirectoryDoesNotExist_ShouldReturnFalse()
        {
            // Arrange
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.DirectoryExists, Is.False);
        }

        [Test]
        public void JpgFiles_WhenDirectoryExists_ShouldReturnJpgFiles()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image1.jpg"), new MockFileData("image1"));
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image2.jpg"), new MockFileData("image2"));
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "document.txt"), new MockFileData("text"));
            
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var jpgFiles = emailItem.JpgFiles.ToList();

            // Assert
            Assert.That(jpgFiles.Count, Is.EqualTo(2));
            Assert.That(jpgFiles.Any(f => f.EndsWith("image1.jpg")), Is.True);
            Assert.That(jpgFiles.Any(f => f.EndsWith("image2.jpg")), Is.True);
            Assert.That(jpgFiles.Any(f => f.EndsWith("document.txt")), Is.False);
        }

        [Test]
        public void JpgFiles_WhenDirectoryDoesNotExist_ShouldReturnEmptyEnumerable()
        {
            // Arrange
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var jpgFiles = emailItem.JpgFiles.ToList();

            // Assert
            Assert.That(jpgFiles, Is.Empty);
        }

        [Test]
        public void FileCount_WhenDirectoryHasJpgFiles_ShouldReturnCorrectCount()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image1.jpg"), new MockFileData("image1"));
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image2.jpg"), new MockFileData("image2"));
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image3.jpg"), new MockFileData("image3"));
            
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.FileCount, Is.EqualTo(3));
        }

        [Test]
        public void FileCount_WhenDirectoryDoesNotExist_ShouldReturnZero()
        {
            // Arrange
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.FileCount, Is.EqualTo(0));
        }

        [Test]
        public void TotalFileSize_WhenDirectoryHasJpgFiles_ShouldReturnCorrectTotalSize()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image1.jpg"), new MockFileData(new byte[100])); // 100 bytes
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image2.jpg"), new MockFileData(new byte[200])); // 200 bytes
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image3.jpg"), new MockFileData(new byte[300])); // 300 bytes
            
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.TotalFileSize, Is.EqualTo(600));
        }

        [Test]
        public void TotalFileSize_WhenDirectoryDoesNotExist_ShouldReturnZero()
        {
            // Arrange
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.TotalFileSize, Is.EqualTo(0));
        }

        [Test]
        public void IsReadyForProcessing_WhenStateIsReadyAndDirectoryExistsWithFiles_ShouldReturnTrue()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image1.jpg"), new MockFileData("image1"));
            
            _testMetadata.State = EmailStateEnum.Ready;
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.IsReadyForProcessing, Is.True);
        }

        [Test]
        public void IsReadyForProcessing_WhenStateIsNotReady_ShouldReturnFalse()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image1.jpg"), new MockFileData("image1"));
            
            _testMetadata.State = EmailStateEnum.Processing;
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.IsReadyForProcessing, Is.False);
        }

        [Test]
        public void IsReadyForProcessing_WhenDirectoryDoesNotExist_ShouldReturnFalse()
        {
            // Arrange
            _testMetadata.State = EmailStateEnum.Ready;
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.IsReadyForProcessing, Is.False);
        }

        [Test]
        public void IsReadyForProcessing_WhenDirectoryExistsButNoFiles_ShouldReturnFalse()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            
            _testMetadata.State = EmailStateEnum.Ready;
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.IsReadyForProcessing, Is.False);
        }

        [Test]
        public void CanBeReset_WhenStateIsNotProcessingOrUploading_ShouldReturnTrue()
        {
            // Arrange
            var testCases = new[]
            {
                EmailStateEnum.Ready,
                EmailStateEnum.Sending,
                EmailStateEnum.Sent,
                EmailStateEnum.Error
            };

            foreach (var state in testCases)
            {
                _testMetadata.State = state;
                var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

                // Act & Assert
                Assert.That(emailItem.CanBeReset, Is.True, $"Failed for state: {state}");
            }
        }

        [Test]
        public void CanBeReset_WhenStateIsProcessingOrUploading_ShouldReturnFalse()
        {
            // Arrange
            var testCases = new[]
            {
                EmailStateEnum.Processing,
                EmailStateEnum.Uploading
            };

            foreach (var state in testCases)
            {
                _testMetadata.State = state;
                var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

                // Act & Assert
                Assert.That(emailItem.CanBeReset, Is.False, $"Failed for state: {state}");
            }
        }

        [Test]
        public void NormalizedRecipient_ShouldReplaceSpecialCharacters()
        {
            // Arrange
            _testMetadata.EmailAddress = "test.user@example.com";
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.NormalizedRecipient, Is.EqualTo("test_dot_user_at_example_dot_com"));
        }

        [Test]
        public void NormalizedRecipient_WithComplexEmail_ShouldHandleMultipleSpecialCharacters()
        {
            // Arrange
            _testMetadata.EmailAddress = "test.user.name@sub.domain.example.com";
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.NormalizedRecipient, Is.EqualTo("test_dot_user_dot_name_at_sub_dot_domain_dot_example_dot_com"));
        }

        #endregion

        #region Method Tests

        [Test]
        public void GenerateZipFileName_WithDefaultTimestamp_ShouldIncludeCurrentTime()
        {
            // Arrange
            _testMetadata.EmailAddress = "test.user@example.com";
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var fileName = emailItem.GenerateZipFileName();

            // Assert
            Assert.That(fileName, Does.StartWith("studioufoto_test_dot_user_at_example_dot_com_"));
            Assert.That(fileName, Does.EndWith(".zip"));
            
            // Check that it contains a timestamp pattern (YYYYMMDD_HHMMSS)
            var timestampPattern = @"\d{8}_\d{6}";
            Assert.That(fileName, Does.Match($@"studioufoto_test_dot_user_at_example_dot_com_{timestampPattern}\.zip"));
        }

        [Test]
        public void GenerateZipFileName_WithSpecificTimestamp_ShouldUseProvidedTimestamp()
        {
            // Arrange
            _testMetadata.EmailAddress = "test.user@example.com";
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);
            var timestamp = new DateTime(2024, 5, 30, 14, 30, 45);

            // Act
            var fileName = emailItem.GenerateZipFileName(timestamp);

            // Assert
            Assert.That(fileName, Is.EqualTo("studioufoto_test_dot_user_at_example_dot_com_20240530_143045.zip"));
        }

        [Test]
        public void Validate_WithAllValidData_ShouldReturnValid()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image1.jpg"), new MockFileData("image1"));
            
            _testMetadata.EmailAddress = "test.user@example.com";
            _testMetadata.Subject = "Valid Subject";
            _testMetadata.Body = "Valid Body";
            
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var (isValid, issues) = emailItem.Validate();

            // Assert
            Assert.That(isValid, Is.True);
            Assert.That(issues, Is.Empty);
        }

        [Test]
        public void Validate_WithMissingEmailAddress_ShouldReturnInvalid()
        {
            // Arrange
            _testMetadata.EmailAddress = "";
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var (isValid, issues) = emailItem.Validate();

            // Assert
            Assert.That(isValid, Is.False);
            Assert.That(issues, Contains.Item("Email address is required"));
        }

        [Test]
        public void Validate_WithNullEmailAddress_ShouldReturnInvalid()
        {
            // Arrange
            _testMetadata.EmailAddress = null;
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var (isValid, issues) = emailItem.Validate();

            // Assert
            Assert.That(isValid, Is.False);
            Assert.That(issues, Contains.Item("Email address is required"));
        }

        [Test]
        public void Validate_WithNonExistentDirectory_ShouldReturnInvalid()
        {
            // Arrange
            _testMetadata.EmailAddress = "test.user@example.com";
            _testMetadata.Subject = "Valid Subject";
            _testMetadata.Body = "Valid Body";
            
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var (isValid, issues) = emailItem.Validate();

            // Assert
            Assert.That(isValid, Is.False);
            Assert.That(issues, Contains.Item($"Directory does not exist: {emailItem.DirectoryPath}"));
        }

        [Test]
        public void Validate_WithDirectoryButNoJpgFiles_ShouldReturnInvalid()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            
            _testMetadata.EmailAddress = "test.user@example.com";
            _testMetadata.Subject = "Valid Subject";
            _testMetadata.Body = "Valid Body";
            
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var (isValid, issues) = emailItem.Validate();

            // Assert
            Assert.That(isValid, Is.False);
            Assert.That(issues, Contains.Item("No JPG files found in directory"));
        }

        [Test]
        public void Validate_WithMissingSubject_ShouldReturnInvalid()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image1.jpg"), new MockFileData("image1"));
            
            _testMetadata.EmailAddress = "test.user@example.com";
            _testMetadata.Subject = "";
            _testMetadata.Body = "Valid Body";
            
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var (isValid, issues) = emailItem.Validate();

            // Assert
            Assert.That(isValid, Is.False);
            Assert.That(issues, Contains.Item("Email subject is required"));
        }

        [Test]
        public void Validate_WithMissingBody_ShouldReturnInvalid()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image1.jpg"), new MockFileData("image1"));
            
            _testMetadata.EmailAddress = "test.user@example.com";
            _testMetadata.Subject = "Valid Subject";
            _testMetadata.Body = "";
            
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var (isValid, issues) = emailItem.Validate();

            // Assert
            Assert.That(isValid, Is.False);
            Assert.That(issues, Contains.Item("Email body is required"));
        }

        [Test]
        public void Validate_WithMultipleIssues_ShouldReturnAllIssues()
        {
            // Arrange
            _testMetadata.EmailAddress = "";
            _testMetadata.Subject = "";
            _testMetadata.Body = "";
            
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var (isValid, issues) = emailItem.Validate();

            // Assert
            Assert.That(isValid, Is.False);
            Assert.That(issues.Count, Is.EqualTo(4)); // Email, Directory, Subject, Body
            Assert.That(issues, Contains.Item("Email address is required"));
            Assert.That(issues, Contains.Item($"Directory does not exist: {emailItem.DirectoryPath}"));
            Assert.That(issues, Contains.Item("Email subject is required"));
            Assert.That(issues, Contains.Item("Email body is required"));
        }

        [Test]
        public void GetSummary_ShouldReturnFormattedSummary()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image1.jpg"), new MockFileData("image1"));
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image2.jpg"), new MockFileData("image2"));
            
            _testMetadata.EmailAddress = "test.user@example.com";
            _testMetadata.State = EmailStateEnum.Ready;
            _testMetadata.Orders = "1001,1002";
            
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var summary = emailItem.GetSummary();

            // Assert
            Assert.That(summary, Is.EqualTo("test.user@example.com - 2 files, Ready, Orders: 1001,1002"));
        }

        [Test]
        public void GetSummary_WithNoFiles_ShouldShowZeroFiles()
        {
            // Arrange
            _testMetadata.EmailAddress = "test.user@example.com";
            _testMetadata.State = EmailStateEnum.Error;
            _testMetadata.Orders = "1001";
            
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var summary = emailItem.GetSummary();

            // Assert
            Assert.That(summary, Is.EqualTo("test.user@example.com - 0 files, Error, Orders: 1001"));
        }

        #endregion

        #region Edge Cases and Boundary Tests

        [Test]
        public void NormalizedRecipient_WithEmptyEmail_ShouldReturnEmpty()
        {
            // Arrange
            _testMetadata.EmailAddress = "";
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act & Assert
            Assert.That(emailItem.NormalizedRecipient, Is.EqualTo(""));
        }

        [Test]
        public void GenerateZipFileName_WithEmptyEmail_ShouldStillGenerateFileName()
        {
            // Arrange
            _testMetadata.EmailAddress = "";
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var fileName = emailItem.GenerateZipFileName();

            // Assert
            Assert.That(fileName, Does.StartWith("studioufoto__"));
            Assert.That(fileName, Does.EndWith(".zip"));
        }

        [Test]
        public void JpgFiles_WithMixedCaseExtensions_ShouldReturnJpgFilesOnly()
        {
            // Arrange
            var directoryPath = Path.Combine(_basePath, _testMetadata.DirectoryName);
            _mockFileSystem.AddDirectory(directoryPath);
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image1.jpg"), new MockFileData("image1"));
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image2.JPG"), new MockFileData("image2"));
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "image3.jpeg"), new MockFileData("image3"));
            _mockFileSystem.AddFile(Path.Combine(directoryPath, "document.txt"), new MockFileData("text"));
            
            var emailItem = new EmailItem(_testMetadata, _basePath, _mockFileSystem);

            // Act
            var jpgFiles = emailItem.JpgFiles.ToList();

            // Assert
            // Note: MockFileSystem's GetFiles with "*.jpg" pattern is case-sensitive
            // This test verifies the current behavior - adjust if case-insensitive matching is needed
            Assert.That(jpgFiles.Count, Is.EqualTo(2)); // Only lowercase .jpg
            Assert.That(jpgFiles.Any(f => f.EndsWith("image1.jpg")), Is.True);
        }

        #endregion
    }
}