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/*
 * SonarQube Java
 * Copyright (C) 2012 SonarSource
 * [email protected]
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */
package org.sonar.java.model;

import org.apache.commons.lang.StringUtils;
import org.sonar.plugins.java.api.tree.ExpressionTree;
import org.sonar.plugins.java.api.tree.LiteralTree;
import org.sonar.plugins.java.api.tree.Tree;
import org.sonar.plugins.java.api.tree.UnaryExpressionTree;

import javax.annotation.CheckForNull;
import javax.annotation.Nullable;

public class LiteralUtils {

  private LiteralUtils() {
    // This class only contains static methods
  }

  @CheckForNull
  public static Integer intLiteralValue(ExpressionTree expression) {
    if (expression.is(Tree.Kind.INT_LITERAL)) {
      return intLiteralValue((LiteralTree) expression);
    }
    if (expression.is(Tree.Kind.UNARY_MINUS, Tree.Kind.UNARY_PLUS)) {
      UnaryExpressionTree unaryExp = (UnaryExpressionTree) expression;
      Integer subExpressionIntValue = intLiteralValue(unaryExp.expression());
      return expression.is(Tree.Kind.UNARY_MINUS) ? minus(subExpressionIntValue) : subExpressionIntValue;
    }
    return null;
  }

  @CheckForNull
  private static Integer intLiteralValue(LiteralTree literal) {
    String literalValue = literal.value();
    if (literalValue.startsWith("0x") || literalValue.startsWith("0b")) {
      return null;
    }
    return Integer.valueOf(literalValue);
  }

  @CheckForNull
  private static Integer minus(@Nullable Integer nullableInteger) {
    return nullableInteger == null ? null : -nullableInteger;
  }

  public static String trimQuotes(String value) {
    return value.substring(1, value.length() - 1);
  }

  @Nullable
  public static String trimLongSuffix(String longString) {
    if (StringUtils.isBlank(longString)) {
      return longString;
    }
    int lastCharPosition = longString.length() - 1;
    char lastChar = longString.charAt(lastCharPosition);
    String value = longString;
    if (lastChar == 'L' || lastChar == 'l') {
      value = longString.substring(0, lastCharPosition);
    }
    return value;
  }
}