/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.apache.myfaces.buildtools.maven2.plugin.faces.generator.taglib;

import org.apache.myfaces.buildtools.maven2.plugin.faces.io.PrettyWriter;
import org.apache.myfaces.buildtools.maven2.plugin.faces.parse.AbstractTagBean;
import org.apache.myfaces.buildtools.maven2.plugin.faces.parse.ConverterBean;
import org.apache.myfaces.buildtools.maven2.plugin.faces.parse.PropertyBean;
import org.apache.myfaces.buildtools.maven2.plugin.faces.util.FilteredIterator;
import org.apache.myfaces.buildtools.maven2.plugin.faces.util.Util;
import org.apache.maven.plugin.logging.Log;

import java.io.File;
import java.io.StringWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Set;
import java.util.Iterator;

public abstract class AbstractConverterTagGenerator extends AbstractTagGenerator {
  protected AbstractConverterTagGenerator(boolean is12, String licenseHeader, Log log) {
    super(is12, licenseHeader, log);
  }

   public void generateTagHandler(
    ConverterBean converter, File generatedSourceDirectory)
  {
    try
    {
      getLog().debug("Generating " + converter.getTagClass());

      StringWriter sw = new StringWriter();
      PrettyWriter out = new PrettyWriter(sw);

      Set imports = createImports(converter);
      writeHeader(out, converter, imports);

      writeClass(out, converter);

      writeConstructor(out, converter);

      writePropertyMethods(out, converter);
      writeDoStartTag(out, converter);
      writeCreateConverter(out, converter);
      writeSetProperties(out, converter);
      writeRelease(out, converter);

      writeEnd(out);
      // delay write in case of error
      // timestamp should not be updated when an error occurs
      // delete target file first, because it is readonly
      File targetFile = createFile(generatedSourceDirectory, converter.getTagClass());
      targetFile.delete();
      FileWriter fw = new FileWriter(targetFile);
      StringBuffer buf = sw.getBuffer();
      fw.write(buf.toString());
      fw.close();
      targetFile.setReadOnly();
    }
    catch (Throwable e)
    {
      getLog().error("Error generating " + converter.getTagClass(), e);
    }
  }

  protected abstract Set createImports(ConverterBean converter);
  protected abstract void writeSetProperty(PrettyWriter out, PropertyBean property);


  private void writeSetProperties(
    PrettyWriter  out,
    ConverterBean converter) throws IOException
  {
    Iterator properties = converter.properties();
    properties = new FilteredIterator(properties, new TagAttributeFilter());
    if (properties.hasNext())
    {
      String converterFullClass = converter.getConverterClass();
      String converterClass = Util.getClassFromFullClass(converterFullClass);
      out.println();
      out.println("private void _setProperties(");
      out.indent();
      out.println(converterClass + " converter) throws JspException");
      out.unindent();
      out.println("{");
      out.indent();
      while (properties.hasNext())
      {
        PropertyBean property = (PropertyBean)properties.next();
        writeSetProperty(out, property);
      }
      out.unindent();
      out.println("}");
    }
  }

  protected void writeCreateConverter(
    PrettyWriter  out,
    ConverterBean converter) throws IOException
  {
    Iterator properties = converter.properties();
    properties = new FilteredIterator(properties, new TagAttributeFilter());
    if (properties.hasNext())
    {
      String converterFullClass = converter.getConverterClass();
      String converterClass = Util.getClassFromFullClass(converterFullClass);

      out.println();
      // TODO: restore coding standards, and make final
      if (is12()) {
        out.println("@Override");
      }
      out.println("protected Converter createConverter() throws JspException");
      out.println("{");
      out.indent();
      if (is12())
      {
        out.println("String converterId = " + converterClass +  ".CONVERTER_ID;");
        out.println("Application appl = FacesContext.getCurrentInstance().getApplication();");
        out.println(converterClass + " converter = " +
                    "(" + converterClass + ")appl.createConverter(converterId);");
      }
      else
      {
        out.println(converterClass + " converter = " +
                    "(" + converterClass + ")super.createConverter();");
      }
      out.println("_setProperties(converter);");
      out.println("return converter;");
      out.unindent();
      out.println("}");
    }
  }


  protected void writeDoStartTag(
      PrettyWriter  out,
      ConverterBean converter) throws IOException
    {
      if (!is12())
      {
        String converterFullClass = converter.getConverterClass();
        String converterClass = Util.getClassFromFullClass(converterFullClass);

        out.println();
        // TODO: restore coding standards, and make final
        out.println("@Override");
        out.println("public int doStartTag() throws JspException");
        out.println("{");
        out.indent();
        out.println("super.setConverterId(" + converterClass + ".CONVERTER_ID);");
        out.println("return super.doStartTag();");
        out.unindent();
        out.println("}");
      }
    }


  private void writeClass(PrettyWriter out, AbstractTagBean abstractTag) {
    String className = Util.getClassFromFullClass(abstractTag.getTagClass());
    if (is12())
    {
      out.println("public class " + className +
                  " extends ConverterELTag");
    }
    else
    {
      out.println("public class " + className +
                  " extends ConverterTag");
    }

    out.println("{");
    out.indent();
  }
}