thesis-src/Examples/ReportGenerator/Models/CharacterStats.cs

namespace ReportGenerator.Models;

internal readonly struct CharacterStats
{
  public string Reference { get; }

  public string Value { get; }

  public double CharacterError { get; }

  public CharacterStats(string reference)
  {
    Reference = reference;
    Value = string.Empty;
    CharacterError = double.PositiveInfinity;
  }

  public CharacterStats(string reference, string value)
  {
    Value = value;
    Reference = reference;

    CharacterError = CalculateCer(reference, value);
  }

  private static double CalculateCer(string s1, string s2)
  {
    var distance = new int[s1.Length + 1, s2.Length + 1];

    for (var i = 0; i <= s1.Length; i++)
    {
      distance[i, 0] = i;
    }

    for (var j = 0; j <= s2.Length; j++)
    {
      distance[0, j] = j;
    }

    for (var i = 1; i <= s1.Length; i++)
    {
      for (var j = 1; j <= s2.Length; j++)
      {
        var cost = s2[j - 1] == s1[i - 1] ? 0 : 1;

        var c1 = Math.Min(distance[i - 1, j] + 1, distance[i, j - 1] + 1);
        var c2 = distance[i - 1, j - 1] + cost;
        distance[i, j] = Math.Min(c1, c2);
      }
    }

    return distance[s1.Length, s2.Length];
  }

  /// <inheritdoc />
  public override string ToString()
  {
    var value = string.IsNullOrEmpty(Value) ? "`null`" : Value;
    return $"{value} ({CharacterError})";
  }
}