/*
 * Copyright 2010 The authors
 * 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.struts2.jsp;

import com.intellij.lang.injection.MultiHostInjector;
import com.intellij.lang.injection.MultiHostRegistrar;
import com.intellij.lang.javascript.JSLanguageInjector;
import com.intellij.lang.javascript.JavaScriptSupportLoader;
import com.intellij.openapi.fileTypes.StdFileTypes;
import com.intellij.openapi.util.TextRange;
import com.intellij.patterns.ElementPattern;
import com.intellij.patterns.StandardPatterns;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiLanguageInjectionHost;
import com.intellij.psi.xml.XmlAttributeValue;
import com.intellij.struts2.StrutsConstants;
import org.jetbrains.annotations.NotNull;

import java.util.Arrays;
import java.util.List;

import static com.intellij.patterns.PlatformPatterns.virtualFile;
import static com.intellij.patterns.StandardPatterns.*;
import static com.intellij.patterns.XmlPatterns.xmlAttributeValue;
import static com.intellij.patterns.XmlPatterns.xmlTag;

/**
 * Adds JavaScript support for Struts UI/jQuery-plugin tags.
 *
 * @author Yann Cébron
 */
public class TaglibJavaScriptInjector implements MultiHostInjector {

  // everything with "onXXX"
  private static final ElementPattern<XmlAttributeValue> JS_ELEMENT_PATTERN =
      xmlAttributeValue()
          .inVirtualFile(or(virtualFile().ofType(StdFileTypes.JSP),
                            virtualFile().ofType(StdFileTypes.JSPX)))
          .withSuperParent(2, xmlTag().withNamespace(StrutsConstants.TAGLIB_STRUTS_UI_URI,
                                                     StrutsConstants.TAGLIB_JQUERY_PLUGIN_URI))
          .withLocalName(
              StandardPatterns.and(
                  string().longerThan(5), // shortest "onXXX" attribute name: 6 characters
                  or(string().startsWith("on"),
                     string().startsWith("doubleOn")),  // **TransferSelect-tags
                  not(string().endsWith("Topics"))))    // exclude jQuery-plugin "onXXXTopics"
      ;

  // struts2-jQuery taglib "pseudo" JS-highlighting
  private static final ElementPattern<XmlAttributeValue> JS_JQUERY_PATTERN =
      xmlAttributeValue()
          .inVirtualFile(or(virtualFile().ofType(StdFileTypes.JSP),
                            virtualFile().ofType(StdFileTypes.JSPX)))
          .withSuperParent(2, xmlTag().withNamespace(StrutsConstants.TAGLIB_JQUERY_PLUGIN_URI,
                                                     StrutsConstants.TAGLIB_JQUERY_RICHTEXT_PLUGIN_URI))
          .withLocalName("effectOptions",
                         // dialog
                         "buttons",
                         // datepicker
                         "showOptions",
                         // grid
                         "filterOptions", "navigatorAddOptions", "navigatorDeleteOptions",
                         "navigatorEditOptions", "navigatorSearchOptions", "navigatorViewOptions",
                         // gridColumn
                         "editoptions", "editrules", "searchoptions",
                         // tabbedPanel
                         "disabledTabs");

  public void getLanguagesToInject(@NotNull final MultiHostRegistrar registrar, @NotNull final PsiElement host) {
    if (JS_ELEMENT_PATTERN.accepts(host)) {
      JSLanguageInjector.injectJSIntoAttributeValue(registrar, (XmlAttributeValue) host, false);
      return;
    }

    // "pseudo" JS
    if (JS_JQUERY_PATTERN.accepts(host)) {
      registrar.startInjecting(JavaScriptSupportLoader.JAVASCRIPT.getLanguage())
               .addPlace("(", ")", (PsiLanguageInjectionHost) host,
                         TextRange.from(1, host.getTextLength() - 2))
               .doneInjecting();
    }
  }

  @NotNull
  public List<? extends Class<? extends PsiElement>> elementsToInjectIn() {
    return Arrays.asList(XmlAttributeValue.class);
  }

}