using System.Text;

namespace Lab9.Services;

public class StepLogger
{
    private readonly StringBuilder _builder = new();

    public void Header(string text)
    {
        _builder.AppendLine(text);
    }

    public void BlankLine()
    {
        _builder.AppendLine();
    }

    public void Line(string text)
    {
        _builder.AppendLine(text);
    }

    public void ArrayState(int[] array, params int[] highlightedIndices)
    {
        var highlighted = highlightedIndices.Length == 0
            ? new HashSet<int>()
            : highlightedIndices.ToHashSet();

        var parts = new string[array.Length];
        for (var i = 0; i < array.Length; i++)
        {
            parts[i] = highlighted.Contains(i) ? $"[{array[i]}]" : array[i].ToString();
        }

        _builder.AppendLine(string.Join(" ", parts));
    }

    public override string ToString() => _builder.ToString();
}