using System.IO;
using System.Text;

namespace Love;

internal class LovePattern
{
    private const int _lineLength = 60;
    private readonly int[] _segmentLengths = new[] {
        60, 1, 12, 26, 9, 12, 3, 8, 24, 17, 8, 4, 6, 23, 21, 6, 4, 6, 22, 12, 5,
        6, 5, 4, 6, 21, 11, 8, 6, 4, 4, 6, 21, 10, 10, 5, 4, 4, 6, 21, 9, 11, 5,
        4, 4, 6, 21, 8, 11, 6, 4, 4, 6, 21, 7, 11, 7, 4, 4, 6, 21, 6, 11, 8, 4,
        4, 6, 19, 1, 1, 5, 11, 9, 4, 4, 6, 19, 1, 1, 5, 10, 10, 4, 4, 6, 18, 2,
        1, 6, 8, 11, 4, 4, 6, 17, 3, 1, 7, 5, 13, 4, 4, 6, 15, 5, 2, 23, 5, 1,
        29, 5, 17, 8, 1, 29, 9, 9, 12, 1, 13, 5, 40, 1, 1, 13, 5, 40, 1, 4, 6,
        13, 3, 10, 6, 12, 5, 1, 5, 6, 11, 3, 11, 6, 14, 3, 1, 5, 6, 11, 3, 11,
        6, 15, 2, 1, 6, 6, 9, 3, 12, 6, 16, 1, 1, 6, 6, 9, 3, 12, 6, 7, 1, 10,
        7, 6, 7, 3, 13, 6, 6, 2, 10, 7, 6, 7, 3, 13, 14, 10, 8, 6, 5, 3, 14, 6,
        6, 2, 10, 8, 6, 5, 3, 14, 6, 7, 1, 10, 9, 6, 3, 3, 15, 6, 16, 1, 1, 9,
        6, 3, 3, 15, 6, 15, 2, 1, 10, 6, 1, 3, 16, 6, 14, 3, 1, 10, 10, 16, 6,
        12, 5, 1, 11, 8, 13, 27, 1, 11, 8, 13, 27, 1, 60
    };
    private readonly StringBuilder _pattern = new();

    public LovePattern(string message)
    {
        Fill(new SourceCharacters(_lineLength, message));
    }

    private void Fill(SourceCharacters source)
    {
        var lineLength = 0;

        foreach (var segmentLength in _segmentLengths)
        {
            foreach (var character in source.GetCharacters(segmentLength))
            {
                _pattern.Append(character);
            }
            lineLength += segmentLength;
            if (lineLength >= _lineLength)
            {
                _pattern.AppendLine();
                lineLength = 0;
            }
        }
    }

    public override string ToString() =>
        new StringBuilder()
            .AppendLines(10)
            .Append(_pattern)
            .AppendLines(10)
            .ToString();
}