/*******************************************************************************
 * Copyright (c) 2004, 2007 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
 *
 
 *******************************************************************************/
package org.eclipse.dltk.internal.core.search.matching;

import org.eclipse.dltk.compiler.CharOperation;
import org.eclipse.dltk.core.DLTKCore;
import org.eclipse.dltk.core.IDLTKLanguageToolkit;
import org.eclipse.dltk.core.IMethod;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.dltk.core.search.SearchPattern;


public class DLTKSearchPattern extends SearchPattern {
	
	/*
	 * Whether this pattern is case sensitive.
	 */
	boolean isCaseSensitive;

	/*
	 * Whether this pattern is camel case.
	 */
	boolean isCamelCase;

	/**
	 * One of following pattern value:
	 * <ul>
	 * 	<li>{@link #R_EXACT_MATCH}</li>
	 *		<li>{@link #R_PREFIX_MATCH}</li>
	 *		<li>{@link #R_PATTERN_MATCH}</li>
	 *		<li>{@link #R_REGEXP_MATCH}</li>
	 *		<li>{@link #R_CAMELCASE_MATCH}</li>
	 * </ul>
	 */
	int matchMode;

	/**
	 * One of {@link #R_ERASURE_MATCH}, {@link #R_EQUIVALENT_MATCH}, {@link #R_FULL_MATCH}.
	 */
	int matchCompatibility;

	/**
	 * Mask used on match rule for match mode.
	 */
	public static final int MATCH_MODE_MASK = R_EXACT_MATCH | R_PREFIX_MATCH | R_PATTERN_MATCH | R_REGEXP_MATCH;

	/**
	 * Mask used on match rule for generic relevance.
	 */
	public static final int MATCH_COMPATIBILITY_MASK = R_ERASURE_MATCH | R_EQUIVALENT_MATCH | R_FULL_MATCH;


	private char[][][] typeArguments;
	private int flags = 0;
	static final int HAS_TYPE_ARGUMENTS = 1;

	protected DLTKSearchPattern(int patternKind, int matchRule, IDLTKLanguageToolkit toolkit) {
		super(matchRule, toolkit);
		((InternalSearchPattern)this).kind = patternKind;
		// Use getMatchRule() instead of matchRule as super constructor may modify its value
		// see bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=81377
		int rule = getMatchRule();
		this.isCaseSensitive = (rule & R_CASE_SENSITIVE) != 0;
		this.isCamelCase = (rule & R_CAMELCASE_MATCH) != 0;
		this.matchCompatibility = rule & MATCH_COMPATIBILITY_MASK;
		this.matchMode = rule & MATCH_MODE_MASK;
	}
	
	public SearchPattern getBlankPattern() {
		return null;
	}

	int getMatchMode() {
		return this.matchMode;
	}

	boolean isCamelCase() {
		return this.isCamelCase;
	}

	boolean isCaseSensitive () {
		return this.isCaseSensitive;
	}

	boolean isErasureMatch() {
		return (this.matchCompatibility & R_ERASURE_MATCH) != 0;
	}

	boolean isEquivalentMatch() {
		return (this.matchCompatibility & R_EQUIVALENT_MATCH) != 0;
	}

	/*
	 * Extract method arguments using unique key for parameterized methods
	 * and type parameters for non-generic ones.
	 */
	char[][] extractMethodArguments(IMethod method) {
		if (method == null) return null;
		if (DLTKCore.DEBUG) {
			System.err.println("TODO: Search: Add correct code here if needed."); //$NON-NLS-1$
		}
		String[] argumentsSignatures = null;		
		try {
			argumentsSignatures = method.getParameters();
		} catch (ModelException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		// Parameterized method
		if (argumentsSignatures != null) {
			int length = argumentsSignatures.length;
			if (length > 0) {
				char[][] methodArguments = new char[length][];
				for (int i=0; i<length; i++) {
					methodArguments[i] = argumentsSignatures[i].toCharArray();
					CharOperation.replace(methodArguments[i], new char[] { '$', '/' }, '.');
				}
				return methodArguments;
			}
		}
		return null;
	}

	/**
	 * Returns whether the pattern has signatures or not.
	 * If pattern {@link #typeArguments} field, this field shows that it was built
	 * on a generic source type.
	 * @return true if {@link #typeSignatures} field is not null and has a length greater than 0.
	 */
	public final boolean hasSignatures() {
		return false;
	}

	/**
	 * Returns whether the pattern includes type arguments information or not.
	 * @return default is false
	 */
	public final boolean hasTypeArguments() {
		return (this.flags & HAS_TYPE_ARGUMENTS) != 0;
	}

	/**
	 * Returns whether the pattern includes type parameters information or not.
	 * @return true if {@link #typeArguments} contains type parameters instead
	 * 	type arguments signatures.
	 */
	public final boolean hasTypeParameters() {
		return !hasSignatures() && hasTypeArguments();
	}
	
	protected StringBuffer print(StringBuffer output) {
		output.append(", "); //$NON-NLS-1$
		
		if (this.isCamelCase) {
			output.append("camel case + "); //$NON-NLS-1$
		}
		switch(getMatchMode()) {
			case R_EXACT_MATCH : 
				output.append("exact match,"); //$NON-NLS-1$
				break;
			case R_PREFIX_MATCH :
				output.append("prefix match,"); //$NON-NLS-1$
				break;
			case R_PATTERN_MATCH :
				output.append("pattern match,"); //$NON-NLS-1$
				break;
			case R_REGEXP_MATCH :
				output.append("regexp match, "); //$NON-NLS-1$
				break;
		}
		if (isCaseSensitive())
			output.append(" case sensitive"); //$NON-NLS-1$
		else
			output.append(" case insensitive"); //$NON-NLS-1$
		if ((this.matchCompatibility & R_ERASURE_MATCH) != 0) {
			output.append(", erasure only"); //$NON-NLS-1$
		}
		if ((this.matchCompatibility & R_EQUIVALENT_MATCH) != 0) {
			output.append(", equivalent oronly"); //$NON-NLS-1$
		}
		return output;
	}


	/*
	 * Extract and store type signatures and arguments using unique key for parameterized types
	 * and type parameters for non-generic ones
	 */
//	void storeTypeSignaturesAndArguments(IType type) {	
//		if (DLTKCore.DEBUG) {
//			System.err.println("TODO: Add DLTKSearchPatter implementation of storeTypeSignatureAndArguments.");
//		}
//		//setTypeArguments(Util.getAllTypeArguments(this.typeSignatures));
//	}
	public final String toString() {
		return print(new StringBuffer(30)).toString();
	}
}
