package NET.worlds.console;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Toolkit;
import java.util.Vector;

public class TextCanvas extends Canvas {
   private static final long serialVersionUID = 2808978760046610505L;
   private Dimension calcSize;
   private Font font;
   private FontMetrics metrics;
   private Vector<String> lines = new Vector<String>();

   public TextCanvas(String text, int width) {
      this.font = new Font(Console.message("CanvasFont"), 0, 12);
      this.metrics = Toolkit.getDefaultToolkit().getFontMetrics(this.font);
      char[] chars = text.toCharArray();
      int start = 0;
      int end = 0;
      int prevEnd = 0;
      int lineWidth = 0;
      end = start;

      while (end < chars.length) {
         char c = chars[end];
         boolean isEOL = c == '\n';
         if (!isEOL && end == chars.length - 1) {
            isEOL = true;
            end++;
         }

         if (c != ' ' && !isEOL) {
            end++;
         } else {
            lineWidth = this.metrics.charsWidth(chars, start, end - start);
            if (width != -1 && lineWidth > width) {
               end = prevEnd;
            } else if ((width == -1 || lineWidth < width) && !isEOL) {
               prevEnd = end++;
               continue;
            }

            this.lines.addElement(new String(chars, start, end - start));
            start = end + 1;

            while (start < chars.length && chars[start] == ' ') {
               start++;
            }

            end = start;
            prevEnd = start;
         }
      }

      this.calcSize = new Dimension(width == -1 ? lineWidth : width, this.metrics.getHeight() * this.lines.size());
   }

   @Override
   public void paint(Graphics g) {
      super.paint(g);
      g.setFont(this.font);
      g.setColor(Color.black);
      int height = this.metrics.getHeight();
      int y = this.metrics.getAscent() + this.metrics.getLeading();

      for (int i = 0; i < this.lines.size(); i++) {
         String line = this.lines.elementAt(i);
         g.drawString(line, 0, y);
         y += height;
      }
   }

   @Override
   public Dimension preferredSize() {
      return this.calcSize;
   }
}