package org.eclipse.wst.jsdt.web.ui.internal.format;

import java.util.LinkedList;
import java.util.Map;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IDocumentPartitioningListener;
import org.eclipse.jface.text.TextUtilities;
import org.eclipse.jface.text.TypedPosition;
import org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy;
import org.eclipse.jface.text.formatter.FormattingContextProperties;
import org.eclipse.jface.text.formatter.IFormattingContext;
import org.eclipse.text.edits.TextEdit;
import org.eclipse.wst.jsdt.core.ICompilationUnit;
import org.eclipse.wst.jsdt.core.IJavaProject;
import org.eclipse.wst.jsdt.core.JavaCore;
import org.eclipse.wst.jsdt.core.JavaModelException;
import org.eclipse.wst.jsdt.core.formatter.CodeFormatter;
import org.eclipse.wst.jsdt.internal.corext.util.CodeFormatterUtil;
import org.eclipse.wst.jsdt.internal.formatter.DefaultCodeFormatter;
import org.eclipse.wst.jsdt.web.core.internal.java.IJsTranslation;
import org.eclipse.wst.jsdt.web.core.internal.java.JsTranslation;
import org.eclipse.wst.jsdt.web.core.internal.java.JsTranslationAdapter;

import org.eclipse.wst.sse.core.StructuredModelManager;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocument;
import org.eclipse.wst.sse.core.internal.text.BasicStructuredDocument;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMDocument;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMModel;

public class FormattingStrategyJSDT extends ContextBasedFormattingStrategy {
	private static final int regionStartIndentLevel = 1;
	/** Documents to be formatted by this strategy */
	private final LinkedList fDocuments = new LinkedList();
	/** Partitions to be formatted by this strategy */
	private final LinkedList fPartitions = new LinkedList();
	private int startIndentLevel;
	
	/**
	 * Creates a new java formatting strategy.
	 */
	public FormattingStrategyJSDT() {
		super();
	}
	
	class ModelIrritant implements IDocumentPartitioningListener {
		public ModelIrritant(IDocument attachedDoc) {}
		
		public void documentPartitioningChanged(IDocument document) {
			document.removeDocumentPartitioningListener(this);
			if (document instanceof BasicStructuredDocument) {
				try {
					((BasicStructuredDocument) document).replace(0, document.getLength(), document.get());
				} catch (BadLocationException ex) {
					// TODO Auto-generated catch block
					ex.printStackTrace();
				}
			}
		}
	}
	
	/*
	 * @see org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy#format()
	 */
	
	public void format() {
		super.format();
		final IStructuredDocument document = (IStructuredDocument) fDocuments.removeFirst();
		final TypedPosition partition = (TypedPosition) fPartitions.removeFirst();
		if (document != null) {
			try {
				// JSPTranslationUtil translationUtil = new
				// JSPTranslationUtil(document);
				JsTranslation translation = getTranslation(document);
				ICompilationUnit cu = translation.getCompilationUnit();
				if (cu != null) {
					String cuSource = cu.getSource();
					int javaStart = partition.getOffset();
					int javaLength = partition.getLength();
					TextEdit edit = CodeFormatterUtil.format2(CodeFormatter.K_COMPILATION_UNIT, cuSource, javaStart, javaLength, startIndentLevel, TextUtilities.getDefaultLineDelimiter(document), getPreferences());
					IDocument doc = new Document(translation.getJsText());
					edit.apply(doc);
					String replaceText = TextUtilities.getDefaultLineDelimiter(document) + getIndentationString(getPreferences(), startIndentLevel) + (doc.get(edit.getOffset(), edit.getLength())).trim() + TextUtilities.getDefaultLineDelimiter(document);
					/*
					 * this is necisary since SSE disconnects document
					 * partitioners.. Because of that, the replaced regions are
					 * considered 'partitionless' when the linestyle provider
					 * trys to color them.
					 * 
					 */
					document.replaceText(document, partition.getOffset(), partition.getLength(), replaceText);
					document.addDocumentPartitioningListener(new ModelIrritant(document));
				}
			} catch (BadLocationException e) {
			} catch (JavaModelException e) {
			}
		}
	}
	
	/*
	 * @see org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy#formatterStarts(org.eclipse.jface.text.formatter.IFormattingContext)
	 */
	
	public void formatterStarts(final IFormattingContext context) {
		fPartitions.addLast(context.getProperty(FormattingContextProperties.CONTEXT_PARTITION));
		fDocuments.addLast(context.getProperty(FormattingContextProperties.CONTEXT_MEDIUM));
		startIndentLevel = FormattingStrategyJSDT.regionStartIndentLevel + 0;
		Map projectOptions = (Map) context.getProperty(FormattingContextProperties.CONTEXT_PREFERENCES);
		if (projectOptions == null) {
			IDocument doc = (IDocument) context.getProperty(FormattingContextProperties.CONTEXT_MEDIUM);
			context.setProperty(FormattingContextProperties.CONTEXT_PREFERENCES, getProjectOptions(doc));
		}
		super.formatterStarts(context);
	}
	
	/*
	 * @see org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy#formatterStops()
	 */
	
	public void formatterStops() {
		super.formatterStops();
		fPartitions.clear();
		fDocuments.clear();
		startIndentLevel = 0;
	}
	
	public String getIndentationString(Map options, int indentationLevel) {
		DefaultCodeFormatter formatter = new DefaultCodeFormatter(options);
		return formatter.createIndentationString(indentationLevel);
	}
	
	private Map getProjectOptions(IDocument baseDocument) {
		IJavaProject javaProject = null;
		IDOMModel xmlModel = null;
		Map options = null;
		try {
			xmlModel = (IDOMModel) StructuredModelManager.getModelManager().getExistingModelForRead(baseDocument);
			String baseLocation = xmlModel.getBaseLocation();
			IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
			IPath filePath = new Path(baseLocation);
			IProject project = null;
			if (filePath.segmentCount() > 0) {
				project = root.getProject(filePath.segment(0));
			}
			if (project != null) {
				javaProject = JavaCore.create(project);
			}
		} finally {
			if (xmlModel != null) {
				xmlModel.releaseFromRead();
			}
		}
		if (javaProject != null) {
			options = javaProject.getOptions(true);
		}
		return options;
	}
	
	public JsTranslation getTranslation(IStructuredDocument document) {
		JsTranslation tran = null;
		IDOMModel xmlModel = null;
		try {
			xmlModel = (IDOMModel) StructuredModelManager.getModelManager().getExistingModelForRead(document);
			IDOMDocument xmlDoc = xmlModel.getDocument();
			JsTranslationAdapter translationAdapter = (JsTranslationAdapter) xmlDoc.getAdapterFor(IJsTranslation.class);
			if (translationAdapter != null) {
				tran = translationAdapter.getJSPTranslation(true);
			}
		} finally {
			if (xmlModel != null) {
				xmlModel.releaseFromRead();
			}
		}
		return tran;
	}
}