/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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.jetbrains.python.inspections;

import com.intellij.codeInspection.LocalInspectionToolSession;
import com.intellij.codeInspection.ProblemsHolder;
import com.intellij.psi.PsiElementVisitor;
import com.jetbrains.python.PyPsiBundle;
import com.jetbrains.python.inspections.quickfix.PyDefaultArgumentQuickFix;
import com.jetbrains.python.psi.PyExpression;
import com.jetbrains.python.psi.PyNamedParameter;
import com.jetbrains.python.psi.PyUtil;
import com.jetbrains.python.psi.types.TypeEvalContext;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public final class PyDefaultArgumentInspection extends PyInspection {

  @Override
  public @NotNull PsiElementVisitor buildVisitor(@NotNull ProblemsHolder holder,
                                                 boolean isOnTheFly,
                                                 @NotNull LocalInspectionToolSession session) {
    return new Visitor(holder, PyInspectionVisitor.getContext(session));
  }

  private static class Visitor extends PyInspectionVisitor {
    Visitor(@Nullable ProblemsHolder holder,
            @NotNull TypeEvalContext context) {
      super(holder, context);
    }

    @Override
    public void visitPyNamedParameter(@NotNull PyNamedParameter node) {
      final PyExpression defaultValue = node.getDefaultValue();
      if (PyUtil.isForbiddenMutableDefault(defaultValue, myTypeEvalContext)) {
        registerProblem(defaultValue, PyPsiBundle.message("INSP.default.arguments.default.argument.value.mutable"),
                        new PyDefaultArgumentQuickFix());
      }
    }
  }
}
