/*
 * Copyright 2003-2013 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.initialization;

import com.intellij.codeInspection.LocalQuickFix;
import com.intellij.codeInspection.options.OptPane;
import com.intellij.psi.*;
import com.siyeh.InspectionGadgetsBundle;
import com.siyeh.ig.BaseInspection;
import com.siyeh.ig.BaseInspectionVisitor;
import com.siyeh.ig.fixes.MakeInitializerExplicitFix;
import com.siyeh.ig.psiutils.ClassUtils;
import com.siyeh.ig.psiutils.InitializationUtils;
import org.jetbrains.annotations.NotNull;

import static com.intellij.codeInspection.options.OptPane.checkbox;
import static com.intellij.codeInspection.options.OptPane.pane;

public final class StaticVariableInitializationInspection extends BaseInspection {

  /**
   * @noinspection PublicField
   */
  public boolean m_ignorePrimitives = false;

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

  @Override
  public @NotNull String buildErrorString(Object... infos) {
    return InspectionGadgetsBundle.message("static.variable.may.not.be.initialized.problem.descriptor");
  }

  @Override
  public @NotNull OptPane getOptionsPane() {
    return pane(
      checkbox("m_ignorePrimitives", InspectionGadgetsBundle.message("primitive.fields.ignore.option")));
  }

  @Override
  public LocalQuickFix buildFix(Object... infos) {
    return new MakeInitializerExplicitFix();
  }

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

  private class StaticVariableInitializationVisitor
    extends BaseInspectionVisitor {

    @Override
    public void visitField(@NotNull PsiField field) {
      if (!field.hasModifierProperty(PsiModifier.STATIC) || field.hasModifierProperty(PsiModifier.FINAL)) {
        return;
      }
      if (field.getInitializer() != null) {
        return;
      }
      final PsiClass containingClass = field.getContainingClass();
      if (containingClass == null || containingClass.isEnum()) {
        return;
      }
      if (m_ignorePrimitives) {
        final PsiType type = field.getType();
        if (ClassUtils.isPrimitive(type)) {
          return;
        }
      }
      final PsiClassInitializer[] initializers = containingClass.getInitializers();
      for (final PsiClassInitializer initializer : initializers) {
        if (!initializer.hasModifierProperty(PsiModifier.STATIC)) {
          continue;
        }
        final PsiCodeBlock body = initializer.getBody();
        if (InitializationUtils.blockAssignsVariableOrFails(body, field)) {
          return;
        }
      }
      registerFieldError(field);
    }
  }
}