/*
 * 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.intellij.openapi.editor.actions;

import com.intellij.find.*;
import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.editor.Caret;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.ScrollType;
import com.intellij.openapi.editor.actionSystem.EditorAction;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.TextRange;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.Iterator;

public class SelectAllOccurrencesAction extends EditorAction {
  protected SelectAllOccurrencesAction() {
    super(new Handler());
  }

  private static class Handler extends SelectOccurrencesActionHandler {
    @Override
    public boolean isEnabledForCaret(@NotNull Editor editor, @NotNull Caret caret, DataContext dataContext) {
      return editor.getProject() != null && editor.getCaretModel().supportsMultipleCarets();
    }

    @Override
    public void doExecute(final Editor editor, @Nullable Caret c, DataContext dataContext) {
      Caret caret = c == null ? editor.getCaretModel().getPrimaryCaret() : c;

      boolean wholeWordsSearch = false;
      if (!caret.hasSelection()) {
        TextRange wordSelectionRange = getSelectionRange(editor, caret);
        if (wordSelectionRange != null) {
          setSelection(editor, caret, wordSelectionRange);
          wholeWordsSearch = true;
        }
      }

      String selectedText = caret.getSelectedText();
      Project project = editor.getProject();
      if (project == null || selectedText == null) {
        return;
      }

      int caretShiftFromSelectionStart = caret.getOffset() - caret.getSelectionStart();
      final FindManager findManager = FindManager.getInstance(project);

      final FindModel model = getFindModel(selectedText, wholeWordsSearch);

      FindUtil.selectSearchResultsInEditor(editor, new Iterator<FindResult>() {
        FindResult findResult = findManager.findString(editor.getDocument().getCharsSequence(), 0, model);

        @Override
        public boolean hasNext() {
          return findResult.isStringFound();
        }

        @Override
        public FindResult next() {
          FindResult result = findResult;
          findResult = findManager.findString(editor.getDocument().getCharsSequence(), findResult.getEndOffset(), model);
          return result;
        }

        @Override
        public void remove() {
          throw new UnsupportedOperationException();
        }
      }, caretShiftFromSelectionStart);
      editor.getScrollingModel().scrollToCaret(ScrollType.RELATIVE);
    }
  }
}
