using System;
using System.Collections.Generic;
using System.Drawing;
using FastReport.Utils;

namespace FastReport
{
    partial class TextObjectBase : ISearchable
    {
        #region ISearchable Members

        /// <inheritdoc/>
        public CharacterRange[] SearchText(string text, bool matchCase, bool wholeWord)
        {
            List<CharacterRange> ranges = new List<CharacterRange>();
            string nonWordChars = " `-=[];',./~!@#$%^&*()+{}:\"<>?\\|\r\n\t";
            int startIndex = 0;

            while (startIndex < Text.Length)
            {
                int i = Text.IndexOf(text, startIndex, matchCase ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase);
                if (i >= 0)
                {
                    bool skip = false;
                    if (wholeWord)
                    {
                        if (i > 0 && nonWordChars.IndexOf(Text[i - 1]) == -1)
                            skip = true;
                        if (i + text.Length < Text.Length && nonWordChars.IndexOf(Text[i + text.Length]) == -1)
                            skip = true;
                    }
                    if (!skip)
                        ranges.Add(new CharacterRange(i, text.Length));
                    startIndex = i + text.Length;
                }
                else
                    break;
            }

            if (ranges.Count > 0)
                return new CharacterRange[] { ranges[0] };
            return null;
        }

        /// <inheritdoc/>
        public virtual void DrawSearchHighlight(FRPaintEventArgs e, CharacterRange range)
        {
            RectangleF rangeRect = new RectangleF(AbsLeft * e.ScaleX, AbsTop * e.ScaleY,
              Width * e.ScaleX, Height * e.ScaleY);

            using (Brush brush = new SolidBrush(Color.FromArgb(128, SystemColors.Highlight)))
            {
                e.Graphics.FillRectangle(brush, rangeRect);
            }
        }

        #endregion
    }
}