/*
 * Copyright 2013-2014 Grzegorz Ligas <ligasgr@gmail.com> and other contributors
 * (see the CONTRIBUTORS file).
 *
 * 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 org.intellij.xquery.annotator.xqdoc;

import com.intellij.lang.annotation.AnnotationHolder;
import com.intellij.openapi.editor.colors.EditorColorsManager;
import com.intellij.openapi.editor.colors.TextAttributesKey;
import com.intellij.openapi.util.Pair;
import com.intellij.openapi.util.TextRange;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.PsiComment;
import com.intellij.psi.tree.IElementType;
import org.jetbrains.annotations.NotNull;

import java.util.List;

import static org.intellij.xquery.documentation.XQDocTransformer.XQ_DOC_TAGS;
import static org.intellij.xquery.highlighting.XQuerySyntaxHighlighter.DOC_COMMENT_TAG;
import static org.intellij.xquery.psi.XQueryBasicTypes.DOC_COMMENT_CONTENT;

/**
 * User: ligasgr
 * Date: 20/12/13
 * Time: 14:42
 */
public class XQDocHighlighter {

    public void highlightXQDocTags(PsiComment comment, AnnotationHolder holder) {
        IElementType tokenType = comment.getTokenType();
        if (tokenType == DOC_COMMENT_CONTENT) {
            highlightCommentContent(comment, holder);
        }
    }

    private void highlightCommentContent(PsiComment comment, AnnotationHolder holder) {
        String commentText = comment.getText();
        for (Pair<String, Integer> wordWithOffset : StringUtil.getWordsWithOffset(commentText)) {
            highlightWordIfTag(comment, holder, wordWithOffset);
        }
    }

    private void highlightWordIfTag(PsiComment comment, AnnotationHolder holder, Pair<String, Integer> pair) {
        Integer offset = pair.second;
        String word = pair.first;
        if (XQ_DOC_TAGS.contains(word)) {
            int absoluteOffset = comment.getTextOffset() + offset;
            highlightTextRange(holder, absoluteOffset, word.length());
        }
    }

    private void highlightTextRange(AnnotationHolder holder, int absoluteOffset, int length) {
        TextRange range = TextRange.from(absoluteOffset, length);
        setHighlighting(range, holder, DOC_COMMENT_TAG);
    }

    private static void setHighlighting(@NotNull TextRange range, @NotNull AnnotationHolder holder,
                                        @NotNull TextAttributesKey key) {
        holder.createInfoAnnotation(range, null).setEnforcedTextAttributes(EditorColorsManager.getInstance()
                .getGlobalScheme().getAttributes(key));
    }
}