using CsvLib;

namespace CvsLib;

public class CsvFieldIndexerTests
{
    #region GenerateIndex
    
    [Fact]
    public void GenerateIndex__Empty()
    {
        // --- Arrange
        StringReader sr = new(string.Empty);
        
        // --- Act
        CsvFieldIndexer indexer = new();
        indexer.GenerateIndex(sr);
        
        // --- Assert
        
        Assert.Single(indexer.Index);
        
        Assert.Equal(0, indexer.Index[0]);
        Assert.Empty(indexer.FieldIndex);
    }
    
    [Fact]
    public void GenerateIndex__PlainText__OneRow()
    {
        // --- Arrange
        StringReader sr = new("Hello World");
        
        // --- Act
        CsvFieldIndexer indexer = new();
        indexer.GenerateIndex(sr);
        
        // --- Assert
        
        Assert.Equal(2, indexer.Index.Count);
        Assert.Equal(0, indexer.Index[0]);
        Assert.Equal(12, indexer.Index[1]);
        
        Assert.Single(indexer.FieldIndex);
        Assert.Equal(0, indexer.FieldIndex[0][0]);
        Assert.Equal(10, indexer.FieldIndex[0][1]);
    }

    [Fact]
    public void GenerateIndex__TwoLinesOfPainText__TwoRows()
    {
        // --- Arrange
        StringReader sr = new("""
                                Hello World
                                Hello World
                                """);
        
        // --- Act
        CsvFieldIndexer indexer = new();
        indexer.GenerateIndex(sr);
        
        // --- Assert
        
        Assert.Equal(3, indexer.Index.Count);
        Assert.Equal(0, indexer.Index[0]);
        Assert.Equal(12, indexer.Index[1]);
        Assert.Equal(24, indexer.Index[2]);
        
        Assert.Equal(2, indexer.FieldIndex.Count);
        Assert.Equal(2, indexer.FieldIndex[0].Count);
        Assert.Equal(0, indexer.FieldIndex[0][0]);
        Assert.Equal(10, indexer.FieldIndex[0][1]);
        Assert.Equal(2, indexer.FieldIndex[1].Count);
        Assert.Equal(12, indexer.FieldIndex[1][0]);
        Assert.Equal(22, indexer.FieldIndex[1][1]);
    }

    [Fact]
    public void GenerateIndex__TwoLinesOfQuotedText__TwoRows()
    {
        // --- Arrange
        StringReader sr = new("""
                                "Hello World"
                                "Hello World"
                                """);
        
        // --- Act
        CsvFieldIndexer indexer = new();
        indexer.GenerateIndex(sr);
        
        // --- Assert
        
        Assert.Equal(3, indexer.Index.Count);
        Assert.Equal(0, indexer.Index[0]);
        Assert.Equal(14, indexer.Index[1]);
        Assert.Equal(28, indexer.Index[2]);
        
        Assert.Equal(2, indexer.FieldIndex.Count);
        Assert.Equal(2, indexer.FieldIndex[0].Count);
        Assert.Equal(1, indexer.FieldIndex[0][0]);
        Assert.Equal(11, indexer.FieldIndex[0][1]);
        Assert.Equal(2, indexer.FieldIndex[1].Count);
        Assert.Equal(15, indexer.FieldIndex[1][0]);
        Assert.Equal(25, indexer.FieldIndex[1][1]);
    }

    [Fact]
    public void GenerateIndex__TwoLinesWithTwoQuotedColumns__TwoRowsTwoFields()
    {
        // --- Arrange
        StringReader sr = new("""
                                "Hello","World"
                                "Hello","World"
                                """);
        
        // --- Act
        CsvFieldIndexer indexer = new();
        indexer.GenerateIndex(sr);
        
        // --- Assert
        
        Assert.Equal(3, indexer.Index.Count);
        Assert.Equal(0, indexer.Index[0]);
        Assert.Equal(16, indexer.Index[1]);
        Assert.Equal(32, indexer.Index[2]);
        
        Assert.Equal(2, indexer.FieldIndex.Count);
        Assert.Equal(4, indexer.FieldIndex[0].Count);
        Assert.Equal(1, indexer.FieldIndex[0][0]);
        Assert.Equal(5, indexer.FieldIndex[0][1]);
        Assert.Equal(9, indexer.FieldIndex[0][2]);
        Assert.Equal(13, indexer.FieldIndex[0][3]);
        Assert.Equal(4, indexer.FieldIndex[1].Count);
        Assert.Equal(17, indexer.FieldIndex[1][0]);
        Assert.Equal(21, indexer.FieldIndex[1][1]);
        Assert.Equal(25, indexer.FieldIndex[1][2]);
        Assert.Equal(29, indexer.FieldIndex[1][3]);
    }

    
    
    #endregion GenerateIndex
}