/*
 * Copyright 2013-2017 consulo.io
 *
 * 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 consulo.csharp.spellchecker;

import org.jetbrains.annotations.NotNull;
import consulo.csharp.lang.psi.impl.source.CSharpPsiUtilImpl;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiNameIdentifierOwner;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.spellchecker.inspections.IdentifierSplitter;
import com.intellij.spellchecker.tokenizer.SpellcheckingStrategy;
import com.intellij.spellchecker.tokenizer.TokenConsumer;
import com.intellij.spellchecker.tokenizer.Tokenizer;
import consulo.annotations.RequiredReadAction;

/**
 * @author VISTALL
 * @since 10.03.14
 */
public class CSharpSpellcheckingStrategy extends SpellcheckingStrategy
{
	private static final Tokenizer<PsiNameIdentifierOwner> ourNameTokenizer = new Tokenizer<PsiNameIdentifierOwner>()
	{
		@Override
		@RequiredReadAction
		public void tokenize(@NotNull PsiNameIdentifierOwner owner, TokenConsumer tokenConsumer)
		{
			PsiElement identifier = owner.getNameIdentifier();
			if(identifier == null)
			{
				return;
			}
			PsiElement parent = owner;

			TextRange range = identifier.getTextRange();
			if(range.isEmpty())
			{
				return;
			}

			String oldText = identifier.getText();
			if(oldText.charAt(0) == '@')
			{
				range = new TextRange(range.getStartOffset() + 1, range.getEndOffset());
			}

			int offset = range.getStartOffset() - parent.getTextRange().getStartOffset();
			if(offset < 0)
			{
				parent = PsiTreeUtil.findCommonParent(identifier, owner);
				offset = range.getStartOffset() - parent.getTextRange().getStartOffset();
			}

			String text = CSharpPsiUtilImpl.getNameWithoutAt(oldText);
			tokenConsumer.consumeToken(parent, text, true, offset, TextRange.allOf(text), IdentifierSplitter.getInstance());
		}
	};

	@NotNull
	@Override
	public Tokenizer getTokenizer(PsiElement element)
	{
		if(element instanceof PsiNameIdentifierOwner)
		{
			return ourNameTokenizer;
		}
		return super.getTokenizer(element);
	}
}