/*
 * Copyright 2000-2013 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.quickfix;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.intellij.codeInspection.LocalQuickFix;
import com.intellij.codeInspection.ProblemDescriptor;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Pair;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.util.PsiTreeUtil;
import com.jetbrains.python.PyBundle;
import com.jetbrains.python.inspections.PyDictCreationInspection;
import com.jetbrains.python.psi.*;
import org.jetbrains.annotations.NotNull;

import java.util.List;
import java.util.Map;

/**
 * Created by IntelliJ IDEA.
 * User: Alexey.Ivanov
 * Date: 26.02.2010
 * Time: 13:29:02
 */
public class DictCreationQuickFix implements LocalQuickFix {
  private final PyAssignmentStatement myStatement;
  public DictCreationQuickFix(@NotNull final PyAssignmentStatement statement) {
    myStatement = statement;
  }

  @Override
  @NotNull
  public String getName() {
    return PyBundle.message("QFIX.dict.creation");
  }

  @Override
  @NotNull
  public String getFamilyName() {
    return getName();
  }

  @Override
  public void applyFix(@NotNull final Project project, @NotNull final ProblemDescriptor descriptor) {
    final PyElementGenerator elementGenerator = PyElementGenerator.getInstance(project);
    final Map<String, String> statementsMap = Maps.newLinkedHashMap();
    final PyExpression assignedValue = myStatement.getAssignedValue();
    if (assignedValue instanceof PyDictLiteralExpression) {
      for (PyKeyValueExpression expression: ((PyDictLiteralExpression)assignedValue).getElements()) {
        final PyExpression value = expression.getValue();
        if (value != null)
          statementsMap.put(expression.getKey().getText(), value.getText());
      }

      PyStatement statement = PsiTreeUtil.getNextSiblingOfType(myStatement, PyStatement.class);
      while (statement instanceof PyAssignmentStatement) {
        final PyAssignmentStatement assignmentStatement = (PyAssignmentStatement)statement;
        final PyExpression target = myStatement.getTargets()[0];
        final String targetName = target.getName();
        if (targetName != null) {
          final List<Pair<PyExpression, PyExpression>> targetsToValues =
                              PyDictCreationInspection.getDictTargets(target, targetName, assignmentStatement);
          final PyStatement nextStatement = PsiTreeUtil.getNextSiblingOfType(statement, PyStatement.class);
          if (targetsToValues == null || targetsToValues.isEmpty()) break;
          for (Pair<PyExpression, PyExpression> targetToValue : targetsToValues) {
            final PySubscriptionExpression subscription = (PySubscriptionExpression)targetToValue.first;
            final PyExpression indexExpression = subscription.getIndexExpression();
            assert indexExpression != null;
            final String indexText;
            if (indexExpression instanceof PyTupleExpression)
              indexText = "("+indexExpression.getText()+")";
            else
              indexText = indexExpression.getText();

            final String valueText;
            if (targetToValue.second instanceof PyTupleExpression)
             valueText = "("+targetToValue.second.getText()+")";
            else
              valueText = targetToValue.second.getText();

            statementsMap.put(indexText, valueText);
            statement.delete();
          }
          statement = nextStatement;
        }
      }
      List<String> statements = Lists.newArrayList();
      for (Map.Entry<String, String> entry : statementsMap.entrySet()) {
        statements.add(entry.getKey() + ": " + entry.getValue());
      }
      final PyExpression expression = elementGenerator.createExpressionFromText(LanguageLevel.forElement(myStatement),
                                                                    "{" + StringUtil.join(statements, ", ") + "}");
      if (expression != null)
        assignedValue.replace(expression);
    }
  }
}