/*******************************************************************************
 * Copyright (c) 2014 Jeff Martin.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Jeff Martin - initial API and implementation
 ******************************************************************************/
package cuchaz.enigma.analysis;

import java.util.Arrays;
import java.util.List;

import cuchaz.enigma.Util;
import cuchaz.enigma.mapping.ClassEntry;
import cuchaz.enigma.mapping.ConstructorEntry;
import cuchaz.enigma.mapping.Entry;

public class EntryReference<E extends Entry,C extends Entry> {
	
	private static final List<String> ConstructorNonNames = Arrays.asList("this", "super", "static");
	public E entry;
	public C context;
	
	private boolean m_isNamed;
	
	public EntryReference(E entry, String sourceName) {
		this(entry, sourceName, null);
	}
	
	public EntryReference(E entry, String sourceName, C context) {
		if (entry == null) {
			throw new IllegalArgumentException("Entry cannot be null!");
		}
		
		this.entry = entry;
		this.context = context;
		
		m_isNamed = sourceName != null && sourceName.length() > 0;
		if (entry instanceof ConstructorEntry && ConstructorNonNames.contains(sourceName)) {
			m_isNamed = false;
		}
	}
	
	public EntryReference(E entry, C context, EntryReference<E,C> other) {
		this.entry = entry;
		this.context = context;
		m_isNamed = other.m_isNamed;
	}
	
	public ClassEntry getLocationClassEntry() {
		if (context != null) {
			return context.getClassEntry();
		}
		return entry.getClassEntry();
	}
	
	public boolean isNamed() {
		return m_isNamed;
	}
	
	public Entry getNameableEntry() {
		if (entry instanceof ConstructorEntry) {
			// renaming a constructor really means renaming the class
			return entry.getClassEntry();
		}
		return entry;
	}
	
	public String getNamableName() {
		if (getNameableEntry() instanceof ClassEntry) {
			ClassEntry classEntry = (ClassEntry)getNameableEntry();
			if (classEntry.isInnerClass()) {
				// make sure we only rename the inner class name
				return classEntry.getInnermostClassName();
			}
		}
		
		return getNameableEntry().getName();
	}
	
	@Override
	public int hashCode() {
		if (context != null) {
			return Util.combineHashesOrdered(entry.hashCode(), context.hashCode());
		}
		return entry.hashCode();
	}
	
	@Override
	public boolean equals(Object other) {
		if (other instanceof EntryReference) {
			return equals((EntryReference<?,?>)other);
		}
		return false;
	}
	
	public boolean equals(EntryReference<?,?> other) {
		// check entry first
		boolean isEntrySame = entry.equals(other.entry);
		if (!isEntrySame) {
			return false;
		}
		
		// check caller
		if (context == null && other.context == null) {
			return true;
		} else if (context != null && other.context != null) {
			return context.equals(other.context);
		}
		return false;
	}
	
	@Override
	public String toString() {
		StringBuilder buf = new StringBuilder();
		buf.append(entry);
		if (context != null) {
			buf.append(" called from ");
			buf.append(context);
		}
		return buf.toString();
	}
}