/*
 * 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.application.options;

import com.intellij.lang.Language;
import com.intellij.openapi.application.ApplicationBundle;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.colors.EditorColorsScheme;
import com.intellij.openapi.editor.highlighter.EditorHighlighter;
import com.intellij.openapi.editor.highlighter.EditorHighlighterFactory;
import com.intellij.openapi.extensions.Extensions;
import com.intellij.openapi.fileTypes.FileType;
import com.intellij.openapi.fileTypes.FileTypes;
import com.intellij.openapi.fileTypes.LanguageFileType;
import com.intellij.openapi.project.ProjectManager;
import com.intellij.openapi.ui.MessageType;
import com.intellij.openapi.ui.popup.Balloon;
import com.intellij.openapi.ui.popup.BalloonBuilder;
import com.intellij.openapi.ui.popup.JBPopupFactory;
import com.intellij.openapi.util.Comparing;
import com.intellij.openapi.util.Disposer;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.PsiFile;
import com.intellij.psi.codeStyle.CodeStyleSettings;
import com.intellij.psi.codeStyle.DisplayPriority;
import com.intellij.psi.codeStyle.FileTypeIndentOptionsProvider;
import com.intellij.psi.codeStyle.LanguageCodeStyleSettingsProvider;
import com.intellij.ui.IdeBorderFactory;
import com.intellij.ui.awt.RelativePoint;
import com.intellij.ui.components.JBLabel;
import com.intellij.ui.components.JBScrollPane;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

public class GeneralCodeStylePanel extends CodeStyleAbstractPanel {
  @SuppressWarnings("UnusedDeclaration")
  private static final Logger LOG = Logger.getInstance("#com.intellij.application.options.GeneralCodeStylePanel");

  private static final String SYSTEM_DEPENDANT_STRING = ApplicationBundle.message("combobox.crlf.system.dependent");
  private static final String UNIX_STRING = ApplicationBundle.message("combobox.crlf.unix");
  private static final String WINDOWS_STRING = ApplicationBundle.message("combobox.crlf.windows");
  private static final String MACINTOSH_STRING = ApplicationBundle.message("combobox.crlf.mac");


  private JSpinner myRightMarginSpinner;
  private JComboBox myLineSeparatorCombo;
  private JPanel myPanel;
  private JCheckBox myCbWrapWhenTypingReachesRightMargin;
  private JPanel myDefaultIndentOptionsPanel;
  private JCheckBox myEnableFormatterTags;
  private JTextField myFormatterOnTagField;
  private JTextField myFormatterOffTagField;
  private JCheckBox myAcceptRegularExpressionsCheckBox;
  private JPanel myMarkersPanel;
  private JBLabel myFormatterOffLabel;
  private JBLabel myFormatterOnLabel;
  private JPanel myMarkerOptionsPanel;
  private final SmartIndentOptionsEditor myIndentOptionsEditor;
  private final JBScrollPane myScrollPane;


  public GeneralCodeStylePanel(CodeStyleSettings settings) {
    super(settings);

    final List<FileTypeIndentOptionsProvider> indentOptionsProviders =
      Arrays.asList(Extensions.getExtensions(FileTypeIndentOptionsProvider.EP_NAME));
    Collections.sort(indentOptionsProviders, new Comparator<FileTypeIndentOptionsProvider>() {
      @Override
      public int compare(FileTypeIndentOptionsProvider p1, FileTypeIndentOptionsProvider p2) {
        Language lang1 = getLanguage(p1.getFileType());
        if (lang1 == null) return -1;
        Language lang2 = getLanguage(p2.getFileType());
        if (lang2 == null) return 1;
        DisplayPriority priority1 = LanguageCodeStyleSettingsProvider.getDisplayPriority(lang1);
        DisplayPriority priority2 = LanguageCodeStyleSettingsProvider.getDisplayPriority(lang2);
        if (priority1.equals(priority2)) {
          return lang1.getDisplayName().compareTo(lang2.getDisplayName());
        }
        return priority1.compareTo(priority2);
      }
    });

    myLineSeparatorCombo.addItem(SYSTEM_DEPENDANT_STRING);
    myLineSeparatorCombo.addItem(UNIX_STRING);
    myLineSeparatorCombo.addItem(WINDOWS_STRING);
    myLineSeparatorCombo.addItem(MACINTOSH_STRING);
    addPanelToWatch(myPanel);

    myRightMarginSpinner.setModel(new SpinnerNumberModel(settings.RIGHT_MARGIN, 1, 1000000, 1));

    myIndentOptionsEditor = new SmartIndentOptionsEditor();
    myDefaultIndentOptionsPanel.add(myIndentOptionsEditor.createPanel(), BorderLayout.CENTER);

    myEnableFormatterTags.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        boolean tagsEnabled = myEnableFormatterTags.isSelected();
        setFormatterTagControlsEnabled(tagsEnabled);
      }
    });

    myMarkersPanel.setBorder(IdeBorderFactory.createTitledBorder(
      ApplicationBundle.message("settings.code.style.general.formatter.marker.title"), true));
    myMarkerOptionsPanel.setBorder(
      IdeBorderFactory.createTitledBorder(ApplicationBundle.message("settings.code.style.general.formatter.marker.options.title"), true));
    myScrollPane = new JBScrollPane(myPanel,
                                    ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
    myScrollPane.setBorder(IdeBorderFactory.createEmptyBorder());
  }

  @Nullable
  private static Language getLanguage(FileType fileType) {
    return fileType instanceof LanguageFileType ? ((LanguageFileType)fileType).getLanguage() : null;
  }

  @Override
  protected void somethingChanged() {
    super.somethingChanged();
  }


  @Override
  protected int getRightMargin() {
    return ((Number) myRightMarginSpinner.getValue()).intValue();
  }

  @Override
  @NotNull
  protected FileType getFileType() {
    return FileTypes.PLAIN_TEXT;
  }

  @Override
  protected String getPreviewText() {
    return "";
  }


  @Override
  public void apply(CodeStyleSettings settings) {
    settings.LINE_SEPARATOR = getSelectedLineSeparator();

    settings.RIGHT_MARGIN = ((Number) myRightMarginSpinner.getValue()).intValue();
    settings.WRAP_WHEN_TYPING_REACHES_RIGHT_MARGIN = myCbWrapWhenTypingReachesRightMargin.isSelected();
    myIndentOptionsEditor.setEnabled(true);
    myIndentOptionsEditor.apply(settings, settings.OTHER_INDENT_OPTIONS);

    settings.FORMATTER_TAGS_ENABLED = myEnableFormatterTags.isSelected();
    settings.FORMATTER_TAGS_ACCEPT_REGEXP = myAcceptRegularExpressionsCheckBox.isSelected();

    settings.FORMATTER_OFF_TAG = getTagText(myFormatterOffTagField, settings.FORMATTER_OFF_TAG);
    settings.setFormatterOffPattern(compilePattern(settings, myFormatterOffTagField, settings.FORMATTER_OFF_TAG));

    settings.FORMATTER_ON_TAG = getTagText(myFormatterOnTagField, settings.FORMATTER_ON_TAG);
    settings.setFormatterOnPattern(compilePattern(settings, myFormatterOnTagField, settings.FORMATTER_ON_TAG));
  }

  @Nullable
  private static Pattern compilePattern(CodeStyleSettings settings, JTextField field, String patternText) {
    try {
      return Pattern.compile(patternText);
    }
    catch (PatternSyntaxException pse) {
      settings.FORMATTER_TAGS_ACCEPT_REGEXP = false;
      showError(field, ApplicationBundle.message("settings.code.style.general.formatter.marker.invalid.regexp"));
      return null;
    }
  }

  private static String getTagText(JTextField field, String defualtValue) {
    String fieldText = field.getText();
    if (StringUtil.isEmpty(field.getText())) {
      field.setText(defualtValue);
      return defualtValue;
    }
    return fieldText;
  }

  @Nullable
  private String getSelectedLineSeparator() {
    if (UNIX_STRING.equals(myLineSeparatorCombo.getSelectedItem())) {
      return "\n";
    }
    else if (MACINTOSH_STRING.equals(myLineSeparatorCombo.getSelectedItem())) {
      return "\r";
    }
    else if (WINDOWS_STRING.equals(myLineSeparatorCombo.getSelectedItem())) {
      return "\r\n";
    }
    return null;
  }


  @Override
  public boolean isModified(CodeStyleSettings settings) {
    if (!Comparing.equal(getSelectedLineSeparator(), settings.LINE_SEPARATOR)) {
      return true;
    }

    if (settings.WRAP_WHEN_TYPING_REACHES_RIGHT_MARGIN ^ myCbWrapWhenTypingReachesRightMargin.isSelected()) {
      return true;
    }

    if (!Comparing.equal(myRightMarginSpinner.getValue(), settings.RIGHT_MARGIN)) return true;
    myIndentOptionsEditor.setEnabled(true);

    if (myEnableFormatterTags.isSelected()) {
      if (
        !settings.FORMATTER_TAGS_ENABLED ||
        settings.FORMATTER_TAGS_ACCEPT_REGEXP != myAcceptRegularExpressionsCheckBox.isSelected() ||
        !StringUtil.equals(myFormatterOffTagField.getText(), settings.FORMATTER_OFF_TAG) ||
        !StringUtil.equals(myFormatterOnTagField.getText(), settings.FORMATTER_ON_TAG)) return true;
    }
    else {
      if (settings.FORMATTER_TAGS_ENABLED) return true;
    }

    return myIndentOptionsEditor.isModified(settings, settings.OTHER_INDENT_OPTIONS);
  }

  @Override
  public JComponent getPanel() {
    return myScrollPane;
  }

  @Override
  protected void resetImpl(final CodeStyleSettings settings) {

    String lineSeparator = settings.LINE_SEPARATOR;
    if ("\n".equals(lineSeparator)) {
      myLineSeparatorCombo.setSelectedItem(UNIX_STRING);
    }
    else if ("\r\n".equals(lineSeparator)) {
      myLineSeparatorCombo.setSelectedItem(WINDOWS_STRING);
    }
    else if ("\r".equals(lineSeparator)) {
      myLineSeparatorCombo.setSelectedItem(MACINTOSH_STRING);
    }
    else {
      myLineSeparatorCombo.setSelectedItem(SYSTEM_DEPENDANT_STRING);
    }

    myRightMarginSpinner.setValue(settings.RIGHT_MARGIN);
    myCbWrapWhenTypingReachesRightMargin.setSelected(settings.WRAP_WHEN_TYPING_REACHES_RIGHT_MARGIN);
    myIndentOptionsEditor.reset(settings, settings.OTHER_INDENT_OPTIONS);
    myIndentOptionsEditor.setEnabled(true);

    myAcceptRegularExpressionsCheckBox.setSelected(settings.FORMATTER_TAGS_ACCEPT_REGEXP);
    myEnableFormatterTags.setSelected(settings.FORMATTER_TAGS_ENABLED);

    myFormatterOnTagField.setText(settings.FORMATTER_ON_TAG);
    myFormatterOffTagField.setText(settings.FORMATTER_OFF_TAG);

    setFormatterTagControlsEnabled(settings.FORMATTER_TAGS_ENABLED);
  }

  private void setFormatterTagControlsEnabled(boolean isEnabled) {
    myFormatterOffTagField.setEnabled(isEnabled);
    myFormatterOnTagField.setEnabled(isEnabled);
    myMarkersPanel.setEnabled(isEnabled);
    myAcceptRegularExpressionsCheckBox.setEnabled(isEnabled);
    myFormatterOffLabel.setEnabled(isEnabled);
    myFormatterOnLabel.setEnabled(isEnabled);
    myMarkerOptionsPanel.setEnabled(isEnabled);
  }

  @Override
  protected EditorHighlighter createHighlighter(final EditorColorsScheme scheme) {
    //noinspection NullableProblems
    return EditorHighlighterFactory.getInstance().createEditorHighlighter(getFileType(), scheme, null);
  }

  @Override
  protected void prepareForReformat(final PsiFile psiFile) {
  }


  @Override
  public Language getDefaultLanguage() {
    return null;
  }

  private static void showError(final JTextField field, final String message) {
    BalloonBuilder balloonBuilder = JBPopupFactory.getInstance()
      .createHtmlTextBalloonBuilder(message, MessageType.ERROR.getDefaultIcon(), MessageType.ERROR.getPopupBackground(), null);
    balloonBuilder.setFadeoutTime(1500);
    final Balloon balloon = balloonBuilder.createBalloon();
    final Rectangle rect = field.getBounds();
    final Point p = new Point(0, rect.height);
    final RelativePoint point = new RelativePoint(field, p);
    balloon.show(point, Balloon.Position.below);
    Disposer.register(ProjectManager.getInstance().getDefaultProject(), balloon);
  }
}