using System.Text.Json;
using JdeScoping.ConfigManager.ViewModels.PipelineSteps;
using JdeScoping.DataSync.Configuration;

namespace JdeScoping.ConfigManager.Tests.ViewModels.PipelineSteps;

public class ColumnDropTransformerViewModelTests
{
    [Fact]
    public void Constructor_WithElement_ParsesColumnsFromConfig()
    {
        // Arrange
        var element = CreateColumnDropElement("Col1", "Col2", "Col3");

        // Act
        var sut = new ColumnDropTransformerViewModel(element, () => { });

        // Assert
        var columns = sut.GetColumns();
        columns.ShouldContain("Col1");
        columns.ShouldContain("Col2");
        columns.ShouldContain("Col3");
    }

    [Fact]
    public void Constructor_WithEmptyElement_InitializesEmpty()
    {
        // Arrange
        var element = new TransformElement { TransformType = "ColumnDrop" };

        // Act
        var sut = new ColumnDropTransformerViewModel(element, () => { });

        // Assert
        sut.GetColumns().ShouldBeEmpty();
    }

    [Fact]
    public void Constructor_Default_InitializesEmpty()
    {
        // Act
        var sut = new ColumnDropTransformerViewModel(() => { });

        // Assert
        sut.GetColumns().ShouldBeEmpty();
        sut.ColumnsText.ShouldBe(string.Empty);
    }

    [Fact]
    public void ColumnsText_Setter_InvokesOnChanged()
    {
        // Arrange
        var onChangedCalled = false;
        var sut = new ColumnDropTransformerViewModel(() => onChangedCalled = true);

        // Act
        sut.ColumnsText = "Column1\nColumn2";

        // Assert
        onChangedCalled.ShouldBeTrue();
    }

    [Fact]
    public void GetColumns_ReturnsNewlineSeparatedColumns()
    {
        // Arrange
        var sut = new ColumnDropTransformerViewModel(() => { });
        sut.ColumnsText = "Col1\nCol2\nCol3";

        // Act
        var columns = sut.GetColumns();

        // Assert
        columns.Count.ShouldBe(3);
        columns[0].ShouldBe("Col1");
        columns[1].ShouldBe("Col2");
        columns[2].ShouldBe("Col3");
    }

    [Fact]
    public void GetColumns_TrimsWhitespace()
    {
        // Arrange
        var sut = new ColumnDropTransformerViewModel(() => { });
        sut.ColumnsText = "  Col1  \n  Col2  ";

        // Act
        var columns = sut.GetColumns();

        // Assert
        columns[0].ShouldBe("Col1");
        columns[1].ShouldBe("Col2");
    }

    [Fact]
    public void GetColumns_IgnoresEmptyLines()
    {
        // Arrange
        var sut = new ColumnDropTransformerViewModel(() => { });
        sut.ColumnsText = "Col1\n\n\nCol2";

        // Act
        var columns = sut.GetColumns();

        // Assert
        columns.Count.ShouldBe(2);
    }

    [Fact]
    public void ToModel_ReturnsCorrectTransformElement()
    {
        // Arrange
        var sut = new ColumnDropTransformerViewModel(() => { });
        sut.ColumnsText = "DropMe\nAlsoDropMe";

        // Act
        var model = sut.ToModel();

        // Assert
        model.TransformType.ShouldBe("ColumnDrop");
        model.Config.ShouldNotBeNull();
    }

    [Fact]
    public void TransformerType_ReturnsColumnDrop()
    {
        // Arrange
        var sut = new ColumnDropTransformerViewModel(() => { });

        // Assert
        sut.TransformerType.ShouldBe("ColumnDrop");
    }

    [Fact]
    public void DisplayName_ReturnsColumnDrop()
    {
        // Arrange
        var sut = new ColumnDropTransformerViewModel(() => { });

        // Assert
        sut.DisplayName.ShouldBe("Column Drop");
    }

    [Fact]
    public void Summary_WithColumns_ShowsCount()
    {
        // Arrange
        var sut = new ColumnDropTransformerViewModel(() => { });
        sut.ColumnsText = "Col1\nCol2\nCol3";

        // Assert
        sut.Summary.ShouldBe("Drop 3 columns");
    }

    [Fact]
    public void Summary_WithNoColumns_ShowsNoColumns()
    {
        // Arrange
        var sut = new ColumnDropTransformerViewModel(() => { });

        // Assert
        sut.Summary.ShouldBe("No columns");
    }

    private static TransformElement CreateColumnDropElement(params string[] columns)
    {
        var config = new { columns };
        var json = JsonSerializer.Serialize(config, new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase });
        using var doc = JsonDocument.Parse(json);
        return new TransformElement
        {
            TransformType = "ColumnDrop",
            Config = doc.RootElement.Clone()
        };
    }
}

public class ColumnRenameTransformerViewModelTests
{
    [Fact]
    public void Constructor_WithElement_ParsesMappingsFromConfig()
    {
        // Arrange
        var element = CreateColumnRenameElement(("OldName", "NewName"), ("Source", "Target"));

        // Act
        var sut = new ColumnRenameTransformerViewModel(element, () => { });

        // Assert
        sut.Mappings.Count.ShouldBe(2);
        sut.Mappings.ShouldContain(m => m.OldName == "OldName" && m.NewName == "NewName");
        sut.Mappings.ShouldContain(m => m.OldName == "Source" && m.NewName == "Target");
    }

    [Fact]
    public void Constructor_WithEmptyElement_InitializesEmpty()
    {
        // Arrange
        var element = new TransformElement { TransformType = "ColumnRename" };

        // Act
        var sut = new ColumnRenameTransformerViewModel(element, () => { });

        // Assert
        sut.Mappings.ShouldBeEmpty();
    }

    [Fact]
    public void Constructor_Default_InitializesEmpty()
    {
        // Act
        var sut = new ColumnRenameTransformerViewModel(() => { });

        // Assert
        sut.Mappings.ShouldBeEmpty();
    }

    [Fact]
    public void AddMapping_AddsNewMapping()
    {
        // Arrange
        var sut = new ColumnRenameTransformerViewModel(() => { });

        // Act
        sut.AddMapping();

        // Assert
        sut.Mappings.Count.ShouldBe(1);
        sut.Mappings[0].OldName.ShouldBe("");
        sut.Mappings[0].NewName.ShouldBe("");
    }

    [Fact]
    public void AddMapping_InvokesOnChanged()
    {
        // Arrange
        var onChangedCalled = false;
        var sut = new ColumnRenameTransformerViewModel(() => onChangedCalled = true);

        // Act
        sut.AddMapping();

        // Assert
        onChangedCalled.ShouldBeTrue();
    }

    [Fact]
    public void RemoveMapping_RemovesMapping()
    {
        // Arrange
        var sut = new ColumnRenameTransformerViewModel(() => { });
        sut.AddMapping();
        var mapping = sut.Mappings[0];

        // Act
        sut.RemoveMapping(mapping);

        // Assert
        sut.Mappings.ShouldBeEmpty();
    }

    [Fact]
    public void RemoveMapping_InvokesOnChanged()
    {
        // Arrange
        var onChangedCount = 0;
        var sut = new ColumnRenameTransformerViewModel(() => onChangedCount++);
        sut.AddMapping();
        var mapping = sut.Mappings[0];
        onChangedCount = 0;

        // Act
        sut.RemoveMapping(mapping);

        // Assert
        onChangedCount.ShouldBe(1);
    }

    [Fact]
    public void ToModel_ReturnsCorrectTransformElement()
    {
        // Arrange
        var sut = new ColumnRenameTransformerViewModel(() => { });
        sut.AddMapping();
        sut.Mappings[0].OldName = "OldCol";
        sut.Mappings[0].NewName = "NewCol";

        // Act
        var model = sut.ToModel();

        // Assert
        model.TransformType.ShouldBe("ColumnRename");
        model.Config.ShouldNotBeNull();
    }

    [Fact]
    public void TransformerType_ReturnsColumnRename()
    {
        // Arrange
        var sut = new ColumnRenameTransformerViewModel(() => { });

        // Assert
        sut.TransformerType.ShouldBe("ColumnRename");
    }

    [Fact]
    public void DisplayName_ReturnsColumnRename()
    {
        // Arrange
        var sut = new ColumnRenameTransformerViewModel(() => { });

        // Assert
        sut.DisplayName.ShouldBe("Column Rename");
    }

    [Fact]
    public void Summary_WithMappings_ShowsCount()
    {
        // Arrange
        var sut = new ColumnRenameTransformerViewModel(() => { });
        sut.AddMapping();
        sut.AddMapping();

        // Assert
        sut.Summary.ShouldBe("Rename 2 columns");
    }

    [Fact]
    public void Summary_WithNoMappings_ShowsNoMappings()
    {
        // Arrange
        var sut = new ColumnRenameTransformerViewModel(() => { });

        // Assert
        sut.Summary.ShouldBe("No mappings");
    }

    private static TransformElement CreateColumnRenameElement(params (string oldName, string newName)[] mappings)
    {
        var dict = mappings.ToDictionary(m => m.oldName, m => m.newName);
        var config = new { mappings = dict };
        var json = JsonSerializer.Serialize(config, new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase });
        using var doc = JsonDocument.Parse(json);
        return new TransformElement
        {
            TransformType = "ColumnRename",
            Config = doc.RootElement.Clone()
        };
    }
}

public class ColumnMappingViewModelTests
{
    [Fact]
    public void Constructor_SetsProperties()
    {
        // Act
        var sut = new ColumnMappingViewModel("OldName", "NewName", () => { });

        // Assert
        sut.OldName.ShouldBe("OldName");
        sut.NewName.ShouldBe("NewName");
    }

    [Fact]
    public void OldName_Setter_InvokesOnChanged()
    {
        // Arrange
        var onChangedCalled = false;
        var sut = new ColumnMappingViewModel("Old", "New", () => onChangedCalled = true);

        // Act
        sut.OldName = "Updated";

        // Assert
        onChangedCalled.ShouldBeTrue();
    }

    [Fact]
    public void NewName_Setter_InvokesOnChanged()
    {
        // Arrange
        var onChangedCalled = false;
        var sut = new ColumnMappingViewModel("Old", "New", () => onChangedCalled = true);

        // Act
        sut.NewName = "Updated";

        // Assert
        onChangedCalled.ShouldBeTrue();
    }

    [Fact]
    public void OldName_Setter_HandlesNull()
    {
        // Arrange
        var sut = new ColumnMappingViewModel("Old", "New", () => { });

        // Act
        sut.OldName = null!;

        // Assert
        sut.OldName.ShouldBe(string.Empty);
    }

    [Fact]
    public void NewName_Setter_HandlesNull()
    {
        // Arrange
        var sut = new ColumnMappingViewModel("Old", "New", () => { });

        // Act
        sut.NewName = null!;

        // Assert
        sut.NewName.ShouldBe(string.Empty);
    }
}

public class JdeDateTransformerViewModelTests
{
    [Fact]
    public void Constructor_WithElement_ParsesPropertiesFromConfig()
    {
        // Arrange
        var element = CreateJdeDateElement("WADDJ", "WADTM", "CompletionDate");

        // Act
        var sut = new JdeDateTransformerViewModel(element, () => { });

        // Assert
        sut.DateColumn.ShouldBe("WADDJ");
        sut.TimeColumn.ShouldBe("WADTM");
        sut.OutputColumn.ShouldBe("CompletionDate");
    }

    [Fact]
    public void Constructor_WithEmptyElement_InitializesNull()
    {
        // Arrange
        var element = new TransformElement { TransformType = "JdeDate" };

        // Act
        var sut = new JdeDateTransformerViewModel(element, () => { });

        // Assert
        sut.DateColumn.ShouldBeNull();
        sut.TimeColumn.ShouldBeNull();
        sut.OutputColumn.ShouldBeNull();
    }

    [Fact]
    public void Constructor_Default_InitializesNull()
    {
        // Act
        var sut = new JdeDateTransformerViewModel(() => { });

        // Assert
        sut.DateColumn.ShouldBeNull();
        sut.TimeColumn.ShouldBeNull();
        sut.OutputColumn.ShouldBeNull();
    }

    [Fact]
    public void DateColumn_Setter_InvokesOnChanged()
    {
        // Arrange
        var onChangedCalled = false;
        var sut = new JdeDateTransformerViewModel(() => onChangedCalled = true);

        // Act
        sut.DateColumn = "WADDJ";

        // Assert
        onChangedCalled.ShouldBeTrue();
    }

    [Fact]
    public void TimeColumn_Setter_InvokesOnChanged()
    {
        // Arrange
        var onChangedCalled = false;
        var sut = new JdeDateTransformerViewModel(() => onChangedCalled = true);

        // Act
        sut.TimeColumn = "WADTM";

        // Assert
        onChangedCalled.ShouldBeTrue();
    }

    [Fact]
    public void OutputColumn_Setter_InvokesOnChanged()
    {
        // Arrange
        var onChangedCalled = false;
        var sut = new JdeDateTransformerViewModel(() => onChangedCalled = true);

        // Act
        sut.OutputColumn = "ResultDate";

        // Assert
        onChangedCalled.ShouldBeTrue();
    }

    [Fact]
    public void ToModel_ReturnsCorrectTransformElement()
    {
        // Arrange
        var sut = new JdeDateTransformerViewModel(() => { });
        sut.DateColumn = "DateCol";
        sut.TimeColumn = "TimeCol";
        sut.OutputColumn = "Output";

        // Act
        var model = sut.ToModel();

        // Assert
        model.TransformType.ShouldBe("JdeDate");
        model.Config.ShouldNotBeNull();
    }

    [Fact]
    public void TransformerType_ReturnsJdeDate()
    {
        // Arrange
        var sut = new JdeDateTransformerViewModel(() => { });

        // Assert
        sut.TransformerType.ShouldBe("JdeDate");
    }

    [Fact]
    public void DisplayName_ReturnsJdeDateConvert()
    {
        // Arrange
        var sut = new JdeDateTransformerViewModel(() => { });

        // Assert
        sut.DisplayName.ShouldBe("JDE Date Convert");
    }

    [Fact]
    public void Summary_WithOutputColumn_ShowsOutputColumn()
    {
        // Arrange
        var sut = new JdeDateTransformerViewModel(() => { });
        sut.OutputColumn = "CompletionDate";

        // Assert
        sut.Summary.ShouldContain("CompletionDate");
    }

    [Fact]
    public void Summary_WithNoOutputColumn_ShowsConfigure()
    {
        // Arrange
        var sut = new JdeDateTransformerViewModel(() => { });

        // Assert
        sut.Summary.ShouldBe("Configure...");
    }

    private static TransformElement CreateJdeDateElement(string? dateColumn, string? timeColumn, string? outputColumn)
    {
        var config = new { dateColumn, timeColumn, outputColumn };
        var json = JsonSerializer.Serialize(config, new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase });
        using var doc = JsonDocument.Parse(json);
        return new TransformElement
        {
            TransformType = "JdeDate",
            Config = doc.RootElement.Clone()
        };
    }
}

public class TransformerFactoryTests
{
    [Fact]
    public void Create_ColumnDrop_ReturnsColumnDropViewModel()
    {
        // Arrange
        var element = new TransformElement { TransformType = "ColumnDrop" };

        // Act
        var result = TransformerFactory.Create(element, () => { });

        // Assert
        result.ShouldBeOfType<ColumnDropTransformerViewModel>();
    }

    [Fact]
    public void Create_ColumnRename_ReturnsColumnRenameViewModel()
    {
        // Arrange
        var element = new TransformElement { TransformType = "ColumnRename" };

        // Act
        var result = TransformerFactory.Create(element, () => { });

        // Assert
        result.ShouldBeOfType<ColumnRenameTransformerViewModel>();
    }

    [Fact]
    public void Create_JdeDate_ReturnsJdeDateViewModel()
    {
        // Arrange
        var element = new TransformElement { TransformType = "JdeDate" };

        // Act
        var result = TransformerFactory.Create(element, () => { });

        // Assert
        result.ShouldBeOfType<JdeDateTransformerViewModel>();
    }

    [Fact]
    public void Create_Regex_ReturnsRegexViewModel()
    {
        // Arrange
        var element = new TransformElement { TransformType = "Regex" };

        // Act
        var result = TransformerFactory.Create(element, () => { });

        // Assert
        result.ShouldBeOfType<RegexTransformerViewModel>();
    }

    [Fact]
    public void Create_CaseInsensitive_WorksCorrectly()
    {
        // Arrange
        var element = new TransformElement { TransformType = "COLUMNDROP" };

        // Act
        var result = TransformerFactory.Create(element, () => { });

        // Assert
        result.ShouldBeOfType<ColumnDropTransformerViewModel>();
    }

    [Fact]
    public void Create_UnknownType_ReturnsNull()
    {
        // Arrange
        var element = new TransformElement { TransformType = "UnknownType" };

        // Act
        var result = TransformerFactory.Create(element, () => { });

        // Assert
        result.ShouldBeNull();
    }

    [Fact]
    public void Create_NullType_ReturnsNull()
    {
        // Arrange
        var element = new TransformElement { TransformType = null };

        // Act
        var result = TransformerFactory.Create(element, () => { });

        // Assert
        result.ShouldBeNull();
    }

    [Fact]
    public void CreateNew_ColumnDrop_ReturnsNewColumnDropViewModel()
    {
        // Act
        var result = TransformerFactory.CreateNew("ColumnDrop", () => { });

        // Assert
        result.ShouldBeOfType<ColumnDropTransformerViewModel>();
    }

    [Fact]
    public void CreateNew_ColumnRename_ReturnsNewColumnRenameViewModel()
    {
        // Act
        var result = TransformerFactory.CreateNew("ColumnRename", () => { });

        // Assert
        result.ShouldBeOfType<ColumnRenameTransformerViewModel>();
    }

    [Fact]
    public void CreateNew_JdeDate_ReturnsNewJdeDateViewModel()
    {
        // Act
        var result = TransformerFactory.CreateNew("JdeDate", () => { });

        // Assert
        result.ShouldBeOfType<JdeDateTransformerViewModel>();
    }

    [Fact]
    public void CreateNew_Regex_ReturnsNewRegexViewModel()
    {
        // Act
        var result = TransformerFactory.CreateNew("Regex", () => { });

        // Assert
        result.ShouldBeOfType<RegexTransformerViewModel>();
    }

    [Fact]
    public void CreateNew_CaseInsensitive_WorksCorrectly()
    {
        // Act
        var result = TransformerFactory.CreateNew("columndrop", () => { });

        // Assert
        result.ShouldBeOfType<ColumnDropTransformerViewModel>();
    }

    [Fact]
    public void CreateNew_UnknownType_ReturnsNull()
    {
        // Act
        var result = TransformerFactory.CreateNew("UnknownType", () => { });

        // Assert
        result.ShouldBeNull();
    }

    [Fact]
    public void CreateNew_NullType_ReturnsNull()
    {
        // Act
        var result = TransformerFactory.CreateNew(null!, () => { });

        // Assert
        result.ShouldBeNull();
    }

    [Fact]
    public void AvailableTypes_ContainsExpectedTypes()
    {
        // Assert
        TransformerFactory.AvailableTypes.ShouldContain("ColumnDrop");
        TransformerFactory.AvailableTypes.ShouldContain("ColumnRename");
        TransformerFactory.AvailableTypes.ShouldContain("JdeDate");
        TransformerFactory.AvailableTypes.ShouldContain("Regex");
    }

    [Fact]
    public void AvailableTypes_HasFourTypes()
    {
        // Assert
        TransformerFactory.AvailableTypes.Count.ShouldBe(4);
    }
}