using System;
using System.Collections.Generic;
using System.Text;

namespace FastReport.Barcode
{
  /// <summary>
  /// Generates the Codabar barcode.
  /// </summary>
  public class BarcodeCodabar : LinearBarcodeBase
  {
#if READONLY_STRUCTS
        private readonly struct Codabar
#else
        private struct Codabar
#endif
        {
#pragma warning disable FR0006 // Field name of struct must be longer than 2 characters.
            public readonly string c;
#pragma warning restore FR0006 // Field name of struct must be longer than 2 characters.
            public readonly string data;

            public Codabar(string c, string data)
            {
                this.c = c;
                this.data = data;
            }
        }

    private static Codabar[] tabelle_cb = {
      new Codabar("1", "5050615"),
      new Codabar("2", "5051506"),
      new Codabar("3", "6150505"),
      new Codabar("4", "5060515"),
      new Codabar("5", "6050515"),
      new Codabar("6", "5150506"),
      new Codabar("7", "5150605"),
      new Codabar("8", "5160505"),
      new Codabar("9", "6051505"),
      new Codabar("0", "5050516"),
      new Codabar("-", "5051605"),
      new Codabar("$", "5061505"),
      new Codabar(":", "6050606"),
      new Codabar("/", "6060506"),
      new Codabar(".", "6060605"),
      new Codabar("+", "5060606"),
      new Codabar("A", "5061515"),
      new Codabar("B", "5151506"),
      new Codabar("C", "5051516"),
      new Codabar("D", "5051615") };

    /// <inheritdoc/>
    public override bool IsNumeric
    {
      get { return false; }
    }

    private int FindBarItem(string c)
    {
      for (int i = 0; i < tabelle_cb.Length; i++)
      {
        if (c == tabelle_cb[i].c)
          return i;
      }
      return -1;
    }

    internal override string GetPattern()
    {
        string result = "";
        int index = FindBarItem("A");
        if (index >= 0)
        {
            result = tabelle_cb[index].data + "0";
        }

        foreach (char c in text)
        {
            index = FindBarItem(c.ToString());
            if (index >= 0)
            {
                result += tabelle_cb[index].data + "0";
            }
        }

        index = FindBarItem("B");
        if (index >= 0)
        {
            result += tabelle_cb[index].data;
        }
        return result;
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="BarcodeCodabar"/> class with default settings.
    /// </summary>
    public BarcodeCodabar()
    {
      ratioMin = 2;
      ratioMax = 3;
    }
  }
}