/*
 * Copyright © 2009-2011 Reinier Zwitserloot and Roel Spilker.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package lombok.javac;

import lombok.core.TransformationsUtil;

import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
import com.sun.tools.javac.tree.JCTree.JCIdent;
import com.sun.tools.javac.tree.JCTree.JCLiteral;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;

/**
 * Container for static utility methods relevant to lombok's operation on javac.
 */
public class Javac {
	private Javac() {
		//prevent instantiation
	}
	
	/**
	 * Translates the given field into all possible getter names.
	 * Convenient wrapper around {@link TransformationsUtil#toAllGetterNames(CharSequence, boolean)}.
	 */
	public static java.util.List<String> toAllGetterNames(JCVariableDecl field) {
		CharSequence fieldName = field.name;
		
		boolean isBoolean = field.vartype.toString().equals("boolean");
		
		return TransformationsUtil.toAllGetterNames(fieldName, isBoolean);
	}
	
	/**
	 * @return the likely getter name for the stated field. (e.g. private boolean foo; to isFoo).
	 * 
	 * Convenient wrapper around {@link TransformationsUtil#toGetterName(CharSequence, boolean)}.
	 */
	public static String toGetterName(JCVariableDecl field) {
		CharSequence fieldName = field.name;
		
		boolean isBoolean = field.vartype.toString().equals("boolean");
		
		return TransformationsUtil.toGetterName(fieldName, isBoolean);
	}
	
	/**
	 * Translates the given field into all possible setter names.
	 * Convenient wrapper around {@link TransformationsUtil#toAllSetterNames(CharSequence, boolean)}.
	 */
	public static java.util.List<String> toAllSetterNames(JCVariableDecl field) {
		CharSequence fieldName = field.name;
		
		boolean isBoolean = field.vartype.toString().equals("boolean");
		
		return TransformationsUtil.toAllSetterNames(fieldName, isBoolean);
	}
	
	/**
	 * @return the likely setter name for the stated field. (e.g. private boolean foo; to setFoo).
	 * 
	 * Convenient wrapper around {@link TransformationsUtil#toSetterName(CharSequence, boolean)}.
	 */
	public static String toSetterName(JCVariableDecl field) {
		CharSequence fieldName = field.name;
		
		boolean isBoolean = field.vartype.toString().equals("boolean");
		
		return TransformationsUtil.toSetterName(fieldName, isBoolean);
	}
	
	/**
	 * Checks if the given expression (that really ought to refer to a type expression) represents a primitive type.
	 */
	public static boolean isPrimitive(JCExpression ref) {
		String typeName = ref.toString();
		return TransformationsUtil.PRIMITIVE_TYPE_NAME_PATTERN.matcher(typeName).matches();
	}
	
	/**
	 * Turns an expression into a guessed intended literal. Only works for literals, as you can imagine.
	 * 
	 * Will for example turn a TrueLiteral into 'Boolean.valueOf(true)'.
	 */
	public static Object calculateGuess(JCExpression expr) {
		if (expr instanceof JCLiteral) {
			JCLiteral lit = (JCLiteral)expr;
			if (lit.getKind() == com.sun.source.tree.Tree.Kind.BOOLEAN_LITERAL) {
				return ((Number)lit.value).intValue() == 0 ? false : true;
			}
			return lit.value;
		} else if (expr instanceof JCIdent || expr instanceof JCFieldAccess) {
			String x = expr.toString();
			if (x.endsWith(".class")) x = x.substring(0, x.length() - 6);
			else {
				int idx = x.lastIndexOf('.');
				if (idx > -1) x = x.substring(idx + 1);
			}
			return x;
		} else return null;
	}
	
	/**
	 * Retrieves a compile time constant of type int from the specified class location.
	 * 
	 * Solves the problem of compile time constant inlining, resulting in lombok having the wrong value 
	 * (javac compiler changes private api constants from time to time)
	 * 
	 * @param ctcLocation location of the compile time constant
	 * @param identifier the name of the field of the compile time constant.
	 */
	public static int getCtcInt(Class<?> ctcLocation, String identifier) {
		try {
			return (Integer)ctcLocation.getField(identifier).get(null);
		} catch (NoSuchFieldException e) {
			throw new RuntimeException(e);
		} catch (IllegalAccessException e) {
			throw new RuntimeException(e);
		}
	}
}