/*
 * 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.console;

import com.intellij.execution.ui.ConsoleViewContentType;
import com.intellij.lexer.Lexer;
import com.intellij.openapi.editor.HighlighterColors;
import com.intellij.openapi.editor.colors.EditorColorsScheme;
import com.intellij.openapi.editor.colors.TextAttributesKey;
import com.intellij.openapi.editor.markup.TextAttributes;
import com.intellij.openapi.util.Pair;
import com.jetbrains.python.highlighting.PyHighlighter;

/**
* @author traff
*/
class PyConsoleSourceHighlighter {
  private final Lexer myLexer;

  private final EditorColorsScheme myScheme;
  private final PyHighlighter myPyHighlighter;

  private int myLexerState;
  private PythonConsoleView myPythonConsoleView;

  PyConsoleSourceHighlighter(PythonConsoleView pythonConsoleView, EditorColorsScheme scheme, PyHighlighter pyHighlighter) {
    myPythonConsoleView = pythonConsoleView;
    myScheme = scheme;
    myPyHighlighter = pyHighlighter;
    myLexer = myPyHighlighter.getHighlightingLexer();
  }

  public void printHighlightedSource(String text) {
    myLexer.start(text, 0, text.length(), getLexerState());
    while (hasNext()) {
      Pair<String, ConsoleViewContentType> pair = next();
      myPythonConsoleView.printText(pair.first, pair.second);
    }
  }

  private boolean hasNext() {
    return myLexer.getTokenType() != null;
  }

  private Pair<String, ConsoleViewContentType> next() {
    myLexerState = myLexer.getState();

    Pair<String, ConsoleViewContentType> res = Pair.create(myLexer.getTokenText(),
                                                           new ConsoleViewContentType("", convertAttributes(
                                                             myPyHighlighter.getTokenHighlights(
                                                               myLexer.getTokenType()))));
    myLexer.advance();

    return res;
  }

  private int getLexerState() {
    return myLexerState != 1024 ? myLexerState : 0;
  }

  protected TextAttributes convertAttributes(TextAttributesKey[] keys) {
    EditorColorsScheme scheme = myScheme;
    TextAttributes attrs = scheme.getAttributes(HighlighterColors.TEXT);
    for (TextAttributesKey key : keys) {
      TextAttributes attrs2 = scheme.getAttributes(key);
      if (attrs2 != null) {
        attrs = TextAttributes.merge(attrs, attrs2);
      }
    }
    return attrs;
  }
}