/*
 * Copyright (c) 2012-2016 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

package org.antlr.v4.gui;

import java.awt.*;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

public class PostScriptDocument {
	public static final String DEFAULT_FONT = "CourierNew";

	public static final Map<String, String> POSTSCRIPT_FONT_NAMES;
	static {
		POSTSCRIPT_FONT_NAMES = new HashMap<String, String>();
		POSTSCRIPT_FONT_NAMES.put(Font.SANS_SERIF + ".plain", "ArialMT");
		POSTSCRIPT_FONT_NAMES.put(Font.SANS_SERIF + ".bold", "Arial-BoldMT");
		POSTSCRIPT_FONT_NAMES.put(Font.SANS_SERIF + ".italic", "Arial-ItalicMT");
		POSTSCRIPT_FONT_NAMES.put(Font.SANS_SERIF + ".bolditalic", "Arial-BoldItalicMT");
		POSTSCRIPT_FONT_NAMES.put(Font.SERIF + ".plain", "TimesNewRomanPSMT");
		POSTSCRIPT_FONT_NAMES.put(Font.SERIF + ".bold", "TimesNewRomanPS-BoldMT");
		POSTSCRIPT_FONT_NAMES.put(Font.SERIF + ".italic", "TimesNewRomanPS-ItalicMT");
		POSTSCRIPT_FONT_NAMES.put(Font.SERIF + ".bolditalic", "TimesNewRomanPS-BoldItalicMT");
		POSTSCRIPT_FONT_NAMES.put(Font.MONOSPACED + ".plain", "CourierNewPSMT");
		POSTSCRIPT_FONT_NAMES.put(Font.MONOSPACED + ".bold", "CourierNewPS-BoldMT");
		POSTSCRIPT_FONT_NAMES.put(Font.MONOSPACED + ".italic", "CourierNewPS-ItalicMT");
		POSTSCRIPT_FONT_NAMES.put(Font.MONOSPACED + ".bolditalic", "CourierNewPS-BoldItalicMT");
	}

	protected int boundingBoxWidth;
	protected int boundingBoxHeight;

	protected SystemFontMetrics fontMetrics;
	protected String fontName;
	protected int fontSize = 12;
	protected double lineWidth = 0.3;
	protected String boundingBox;

	protected StringBuilder ps = new StringBuilder();
	protected boolean closed = false;

	public PostScriptDocument() {
		this(DEFAULT_FONT, 12);
	}

	public PostScriptDocument(String fontName, int fontSize) {
		header();
		setFont(fontName, fontSize);
	}

	public String getPS() {
		close();
		return header()+ps.toString();
	}

	public void boundingBox(int w, int h) {
		boundingBoxWidth = w;
		boundingBoxHeight = h;
		boundingBox = String.format(Locale.US, "%%%%BoundingBox: %d %d %d %d\n", 0,0,
									boundingBoxWidth,boundingBoxHeight);
	}

	public void close() {
		if ( closed ) return;
//		ps.append("showpage\n");
		ps.append("%%Trailer\n");
		closed = true;
	}

	/** Compute the header separately because we need to wait for the bounding box */
	protected StringBuilder header() {
		StringBuilder b = new StringBuilder();
		b.append("%!PS-Adobe-3.0 EPSF-3.0\n");
		b.append(boundingBox).append("\n");
		b.append("0.3 setlinewidth\n");
		b.append("%% x y w h highlight\n" +
				 "/highlight {\n" +
				 "        4 dict begin\n" +
				 "        /h exch def\n" +
				 "        /w exch def\n" +
				 "        /y exch def\n" +
				 "        /x exch def\n" +
				 "        gsave\n" +
				 "        newpath\n" +
				 "        x y moveto\n" +
				 "        0 h rlineto     % up to left corner\n" +
				 "        w 0 rlineto     % to upper right corner\n" +
				 "        0 h neg rlineto % to lower right corner\n" +
				 "        w neg 0 rlineto % back home to lower left corner\n" +
				 "        closepath\n" +
				 "        .95 .83 .82 setrgbcolor\n" +
				 "        fill\n" +
				 "        grestore\n" +
				 "        end\n" +
				 "} def\n");

		return b;
	}

	public void setFont(String fontName, int fontSize) {
		this.fontMetrics = new SystemFontMetrics(fontName);
		this.fontName = fontMetrics.getFont().getPSName();
		this.fontSize = fontSize;

		String psname = POSTSCRIPT_FONT_NAMES.get(this.fontName);
		if (psname == null) {
			psname = this.fontName;
		}

		ps.append(String.format(Locale.US, "/%s findfont %d scalefont setfont\n", psname, fontSize));
	}

	public void lineWidth(double w) {
		lineWidth = w;
		ps.append(w).append(" setlinewidth\n");
	}

	public void move(double x, double y) {
		ps.append(String.format(Locale.US, "%1.3f %1.3f moveto\n", x, y));
	}

	public void lineto(double x, double y) {
		ps.append(String.format(Locale.US, "%1.3f %1.3f lineto\n", x, y));
	}

	public void line(double x1, double y1, double x2, double y2) {
		move(x1, y1);
		lineto(x2, y2);
	}

	public void rect(double x, double y, double width, double height) {
		line(x, y, x, y + height);
		line(x, y + height, x + width, y + height);
		line(x + width, y + height, x + width, y);
		line(x + width, y, x, y);
	}

	/** Make red box */
	public void highlight(double x, double y, double width, double height) {
		ps.append(String.format(Locale.US, "%1.3f %1.3f %1.3f %1.3f highlight\n", x, y, width, height));
	}

	public void stroke() {
		ps.append("stroke\n");
	}

//	public void rarrow(double x, double y) {
//		ps.append(String.format(Locale.US, "%1.3f %1.3f rarrow\n", x,y));
//	}
//
//	public void darrow(double x, double y) {
//		ps.append(String.format(Locale.US, "%1.3f %1.3f darrow\n", x,y));
//	}

	public void text(String s, double x, double y) {
		StringBuilder buf = new StringBuilder();
		// escape \, (, ): \\,  \(,  \)
		for (char c : s.toCharArray()) {
			switch ( c ) {
				case '\\' :
				case '(' :
				case ')' :
					buf.append('\\');
					buf.append(c);
					break;
				default :
					buf.append(c);
					break;
			}
		}
		s = buf.toString();
		move(x,y);
		ps.append(String.format(Locale.US, "(%s) show\n", s));
		stroke();
	}

	// courier new: wid/hei 7.611979	10.0625
	/** All chars are 600 thousands of an 'em' wide if courier */
	public double getWidth(char c) { return fontMetrics.getWidth(c, fontSize); }
	public double getWidth(String s) { return fontMetrics.getWidth(s, fontSize); }
	public double getLineHeight() { return fontMetrics.getLineHeight(fontSize); }

	public int getFontSize() { return fontSize; }
}