/*
 * Copyright 2003-2018 Dave Griffith, Bas Leijdekkers
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.siyeh.ig.threading;

import com.intellij.psi.*;
import com.intellij.psi.util.InheritanceUtil;
import com.siyeh.HardcodedMethodConstants;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;

final class ThreadingUtils {

  private ThreadingUtils() {
  }

  public static boolean isWaitCall(
    @NotNull PsiMethodCallExpression expression) {
    final PsiReferenceExpression methodExpression =
      expression.getMethodExpression();
    final @NonNls String methodName = methodExpression.getReferenceName();
    if (!HardcodedMethodConstants.WAIT.equals(methodName)) {
      return false;
    }
    final PsiMethod method = expression.resolveMethod();
    if (method == null) {
      return false;
    }
    final PsiParameterList parameterList = method.getParameterList();
    final int numParams = parameterList.getParametersCount();
    if (numParams > 2) {
      return false;
    }
    final PsiParameter[] parameters = parameterList.getParameters();
    if (numParams > 0) {
      final PsiType parameterType = parameters[0].getType();
      if (!parameterType.equals(PsiTypes.longType())) {
        return false;
      }
    }
    if (numParams > 1) {
      final PsiType parameterType = parameters[1].getType();
      if (!parameterType.equals(PsiTypes.intType())) {
        return false;
      }
    }
    return true;
  }

  public static boolean isNotifyOrNotifyAllCall(
    @NotNull PsiMethodCallExpression expression) {
    final PsiReferenceExpression methodExpression =
      expression.getMethodExpression();
    final @NonNls String methodName = methodExpression.getReferenceName();
    if (!HardcodedMethodConstants.NOTIFY.equals(methodName) && !HardcodedMethodConstants.NOTIFY_ALL.equals(methodName)) {
      return false;
    }
    final PsiExpressionList argumentList = expression.getArgumentList();
    final PsiExpression[] args = argumentList.getExpressions();
    return args.length == 0;
  }

  public static boolean isSignalOrSignalAllCall(
    @NotNull PsiMethodCallExpression expression) {
    final PsiReferenceExpression methodExpression =
      expression.getMethodExpression();
    final @NonNls String methodName = methodExpression.getReferenceName();
    if (!"signal".equals(methodName) && !"signalAll".equals(methodName)) {
      return false;
    }
    if (!expression.getArgumentList().isEmpty()) {
      return false;
    }
    final PsiMethod method = expression.resolveMethod();
    if (method == null) {
      return false;
    }
    final PsiClass containingClass = method.getContainingClass();
    if (containingClass == null) {
      return false;
    }
    return InheritanceUtil.isInheritor(containingClass,
                                       "java.util.concurrent.locks.Condition");
  }

  public static boolean isAwaitCall(
    @NotNull PsiMethodCallExpression expression) {
    final PsiReferenceExpression methodExpression =
      expression.getMethodExpression();
    final @NonNls String methodName = methodExpression.getReferenceName();
    if (!"await".equals(methodName)
        && !"awaitUntil".equals(methodName)
        && !"awaitUninterruptibly".equals(methodName)
        && !"awaitNanos".equals(methodName)) {
      return false;
    }
    final PsiMethod method = expression.resolveMethod();
    if (method == null) {
      return false;
    }
    final PsiClass containingClass = method.getContainingClass();
    if (containingClass == null) {
      return false;
    }
    return InheritanceUtil.isInheritor(containingClass,
                                       "java.util.concurrent.locks.Condition");
  }
}