/*******************************************************************************
 * Copyright (c) 2004, 2010 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.css.ui.internal.contentassist;


import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.wst.css.core.internal.parserz.CSSRegionContexts;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSMediaRule;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSNode;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSPageRule;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSPrimitiveValue;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSStyleDeclItem;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSStyleDeclaration;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSStyleRule;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSStyleSheet;
import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegion;
import org.w3c.dom.css.CSSFontFaceRule;

class CSSProposalArranger {

	private List fProposals = new ArrayList();
	private CSSContentAssistContext fContext = null;

	/**
	 * CSSProposalArranger constructor comment.
	 */
	private CSSProposalArranger() {
		super();
	}

	/**
	 * CSSProposalArranger constructor comment.
	 */
	CSSProposalArranger(int documentPosition, ICSSNode node, int documentOffset, char quote) {
		this();
		fContext = new CSSContentAssistContext(documentPosition, node, documentOffset, quote);
	}

	CSSProposalArranger(int documentPosition, ICSSNode node, int documentOffset, int length, char quote) {
		this();
		fContext = new CSSContentAssistContext(documentPosition, node, documentOffset, length, quote);
	}

	CSSProposalArranger(int documentPosition, ICSSNode node, int documentOffset, char quote, boolean selected) {
		this();
		fContext = new CSSContentAssistContext(documentPosition, node, documentOffset, quote, selected);
	}

	/**
	 *  
	 */
	void buildProposals() {
		fProposals.clear();

		/*
		 * String text; ICompletionProposal item; text = "---- Test
		 * Information ----"; item = new CompletionProposal("",
		 * fContext.getReplaceBegin(), 0, 0, null, text, null, null);
		 * fProposals.add(item);
		 * 
		 * text = "Target: \"" + fContext.getRegionText() + "\"";
		 * 
		 * item = new CompletionProposal("", fContext.getReplaceBegin(), 0, 0,
		 * null, text, null, null); fProposals.add(item);
		 * 
		 * text = fContext.getTargetNode().getClass().toString(); int
		 * lastPeriodPos = text.lastIndexOf('.'); text = "Node: " +
		 * text.substring(lastPeriodPos + 1); item = new
		 * CompletionProposal("", fContext.getReplaceBegin(), 0, 0, null,
		 * text, null, null); fProposals.add(item);
		 */

		ICSSNode targetNode = fContext.getTargetNode();
		//int targetPos = fContext.getTargetPos();
		if (targetNode instanceof ICSSStyleSheet) {
			buildProposalsForAnyRule();
		} else if ((targetNode instanceof ICSSMediaRule && fContext.isTargetPosAfterOf(CSSRegionContexts.CSS_LBRACE)) || (targetNode instanceof ICSSStyleRule && fContext.isTargetPosBeforeOf(CSSRegionContexts.CSS_LBRACE))) {
			buildProposalsForAnyRule();
			//		buildProposalsForStyleRule();
		} else if ((targetNode instanceof ICSSPageRule && fContext.isTargetPosBeforeOf(CSSRegionContexts.CSS_LBRACE))) {
			buildProposalsForPageRulePseudoClass();
		} else if ((targetNode instanceof ICSSStyleRule || targetNode instanceof CSSFontFaceRule || targetNode instanceof ICSSPageRule || targetNode instanceof ICSSStyleDeclaration) && (targetNode.getOwnerDocument() instanceof ICSSStyleDeclaration || fContext.targetFollows(CSSRegionContexts.CSS_DECLARATION_DELIMITER) || fContext.targetFollows(CSSRegionContexts.CSS_LBRACE))) {
			buildProposalsForDeclarationName();
		} else if (targetNode instanceof ICSSStyleDeclItem) {
			if (fContext.isTargetPosAfterOf(CSSRegionContexts.CSS_DECLARATION_SEPARATOR)) {
				buildProposalsForDeclarationValue();
			} else {
				buildProposalsForDeclarationName();
			}
		} else if (targetNode instanceof ICSSPrimitiveValue) {
			buildProposalsForDeclarationValue();
		}
		/*
		 * else if (targetNode instanceof ICSSPrimitiveValue || ((targetNode
		 * instanceof ICSSStyleRule || targetNode instanceof CSSFontFaceRule ||
		 * targetNode instanceof ICSSStyleDeclaration || targetNode instanceof
		 * ICSSStyleDeclItem) &&
		 * fContext.isTargetPosAfterOf(CSSRegionContexts.COLON))) {
		 * buildProposalsForDeclarationValue(); }
		 */

		// for Test
	}

	/**
	 *  
	 */
	void buildProposalsForAnyRule() {
		CSSProposalGenerator generator;
		if (isFirstRegion()){
			generator = new CSSProposalGeneratorForAtmarkRule(fContext);
			fProposals.addAll(generator.getProposals());
		}
		generator = new CSSProposalGeneratorForHTMLTag(fContext);
		fProposals.addAll(generator.getProposals());
		generator = new CSSProposalGeneratorForPseudoSelector(fContext);
		fProposals.addAll(generator.getProposals());
	}

	private boolean isFirstRegion(){
		if (fContext.getCursorPos() == 0)
			return true;

		ITextRegion region = fContext.getTargetRegion();
		ITextRegion currRegion = fContext.getRegionByOffset(fContext.getCursorPos());
		String type = null;
	    String crType = null;
		if(region != null) {
			type = region.getType();
		}
		if(currRegion != null) {
			crType = currRegion.getType();
		}
		if (type == null || crType == null || (crType == type))
			return true;
		else 
			return false;
	}
	/**
	 *  
	 */
	void buildProposalsForDeclarationName() {
		CSSProposalGenerator generator;
		generator = new CSSProposalGeneratorForDeclarationName(fContext);
		fProposals.addAll(generator.getProposals());
	}

	/**
	 *  
	 */
	void buildProposalsForDeclarationValue() {
		CSSProposalGenerator generator;
		generator = new CSSProposalGeneratorForDeclarationValue(fContext);
		fProposals.addAll(generator.getProposals());
	}

	/**
	 *  
	 */
	void buildProposalsForPageRulePseudoClass() {
		CSSProposalGenerator generator;
		generator = new CSSProposalGeneratorForPseudoSelector(fContext);
		fProposals.addAll(generator.getProposals());
	}

	/**
	 *  
	 */
	void buildProposalsForStyleRule() {
		CSSProposalGenerator generator;
		generator = new CSSProposalGeneratorForHTMLTag(fContext);
		fProposals.addAll(generator.getProposals());
		generator = new CSSProposalGeneratorForPseudoSelector(fContext);
		fProposals.addAll(generator.getProposals());
	}

	/**
	 *  
	 */
	ICompletionProposal[] getProposals() {
		buildProposals();
		ICompletionProposal[] proposalArray = new ICompletionProposal[fProposals.size()];
		Iterator iItem = fProposals.iterator();
		for (int i = 0; iItem.hasNext(); i++) {
			proposalArray[i] = (ICompletionProposal) iItem.next();
		}
		return proposalArray;
	}
}