/*
 * Copyright 2003-2010 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.classmetrics.impl;

import com.intellij.codeInspection.LocalQuickFix;
import com.intellij.psi.PsiAnonymousClass;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiEnumConstantInitializer;
import com.siyeh.InspectionGadgetsBundle;
import com.siyeh.ig.BaseInspectionVisitor;
import com.siyeh.ig.classmetrics.ClassMetricInspection;
import com.siyeh.ig.fixes.MoveAnonymousToInnerClassFix;
import org.jetbrains.annotations.NotNull;

public final class AnonymousClassMethodCountInspection
  extends ClassMetricInspection {

  private static final int DEFAULT_METHOD_COUNT_LIMIT = 1;

  @Override
  protected LocalQuickFix buildFix(Object... infos) {
    return new MoveAnonymousToInnerClassFix();
  }

  @Override
  public @NotNull String getID() {
    return "AnonymousInnerClassWithTooManyMethods";
  }

  @Override
  protected int getDefaultLimit() {
    return DEFAULT_METHOD_COUNT_LIMIT;
  }

  @Override
  protected String getConfigurationLabel() {
    return InspectionGadgetsBundle.message("method.count.limit.option");
  }

  @Override
  protected boolean buildQuickFixesOnlyForOnTheFlyErrors() {
    return true;
  }

  @Override
  public @NotNull String buildErrorString(Object... infos) {
    final Integer count = (Integer)infos[0];
    return InspectionGadgetsBundle.message(
      "anonymous.inner.class.with.too.many.methods.problem.descriptor",
      count);
  }

  @Override
  public @NotNull BaseInspectionVisitor buildVisitor() {
    return new AnonymousClassMethodCountVisitor();
  }

  private class AnonymousClassMethodCountVisitor
    extends BaseInspectionVisitor {

    @Override
    public void visitClass(@NotNull PsiClass psiClass) {
      // no call to super, to prevent double counting
    }

    @Override
    public void visitAnonymousClass(
      @NotNull PsiAnonymousClass aClass) {
      if (aClass instanceof PsiEnumConstantInitializer) {
        return;
      }
      final int totalMethodCount = calculateTotalMethodCount(aClass);
      if (totalMethodCount <= getLimit()) {
        return;
      }
      registerClassError(aClass, Integer.valueOf(totalMethodCount));
    }

    private static int calculateTotalMethodCount(PsiClass aClass) {
      return aClass.getMethods().length - aClass.getConstructors().length;
    }
  }
}