package net.sourceforge.phpeclipse.phpeditor.html;

import net.sourceforge.phpeclipse.phpeditor.PHPEditor;
import net.sourceforge.phpeclipse.phpeditor.PHPSourceViewerConfiguration;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.formatter.IFormattingStrategy;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.jface.text.source.SourceViewer;

/**
 * @author chrisl
 *
 * To change this generated comment edit the template variable "typecomment":
 * Window>Preferences>Java>ObfuscatorIgnores.
 * To enable and disable the creation of type comments go to
 * Window>Preferences>Java>Code Generation.
 */
public class HTMLFormattingStrategy implements IFormattingStrategy, IHTMLConstants {

	////////////////////////////////////////////////////////////////////////

	private PHPSourceViewerConfiguration fConfig;
	private ISourceViewer fViewer;
	//
	private PHPEditor fEditor;
	private int fTabWidth;

	////////////////////////////////////////////////////////////////////////

	public HTMLFormattingStrategy(PHPSourceViewerConfiguration cf, ISourceViewer viewer) {
		fConfig = cf;
		fViewer = viewer;
		//
		fEditor = fConfig.getEditor();
		initPreferences();
	}

	public void initPreferences() {
		fTabWidth=fConfig.getTabWidth(fViewer);
	}
	
	////////////////////////////////////////////////////////////////////////

	/**
	 * @see IFormattingStrategy#formatterStarts(String)
	 */
	public void formatterStarts(String initialIndentation) {
	}

	/**
	 * @see IFormattingStrategy#formatterStops()
	 */
	public void formatterStops() {
	}

	/**
	 * @see IFormattingStrategy#format(String, boolean, String, int[])
	 */
	public String format(String content, boolean isLineStart, String indentation, int[] positions) {
		HTMLFormatter formatter = new HTMLFormatter(fConfig, (SourceViewer) fViewer);
		IDocument doc = fViewer.getDocument();
		String lineDelimiter = getLineDelimiterFor(doc);
		int indent = 0;
		if (indentation != null) {
			indent = computeIndent(indentation, fTabWidth);
		}
		return formatter.format(content, indent, positions, lineDelimiter, fEditor.getEditorInput().getName());
	}

	public static String getLineDelimiterFor(IDocument doc) {
		String lineDelim = null;
		try {
			lineDelim = doc.getLineDelimiter(0);
		} catch (BadLocationException e) {
		}
		if (lineDelim == null) {
			String systemDelimiter = System.getProperty("line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$
			String[] lineDelims = doc.getLegalLineDelimiters();
			for (int i = 0; i < lineDelims.length; i++) {
				if (lineDelims[i].equals(systemDelimiter)) {
					lineDelim = systemDelimiter;
					break;
				}
			}
			if (lineDelim == null) {
				lineDelim = lineDelims.length > 0 ? lineDelims[0] : systemDelimiter;
			}
		}
		return lineDelim;
	}

	/**
	 * Returns the indent of the given string.
	 * 
	 * @param line the text line
	 * @param tabWidth the width of the '\t' character.
	 * 
	 * @see org.eclipse.jdt.internal.corext.util.Strings.computeIndent(String,int)
	 */
	public static int computeIndent(String line, int tabWidth) {
		int result = 0;
		int blanks = 0;
		int size = line.length();
		for (int i = 0; i < size; i++) {
			char c = line.charAt(i);
			if (c == '\t') {
				result++;
				blanks = 0;
			} else if (Character.isSpaceChar(c)) {
				blanks++;
				if (blanks == tabWidth) {
					result++;
					blanks = 0;
				}
			} else {
				return result;
			}
		}
		return result;
	}

	////////////////////////////////////////////////////////////////////////

}