package org.jboss.resteasy.plugins.providers.atom;

import java.util.ArrayList;
import java.util.List;

import javax.ws.rs.core.MediaType;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAnyElement;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlMixed;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlTransient;
import javax.xml.bind.annotation.XmlType;

import org.jboss.resteasy.plugins.providers.jaxb.JAXBContextFinder;
import org.jboss.resteasy.plugins.providers.jaxb.JAXBXmlTypeProvider;
import org.w3c.dom.Element;

/**
 * <p>Represents an atomTextConstruct element.</p>
 * <p/>
 * <p>Per RFC4287:</p>
 * <p/>
 * <pre>
 *  A Text construct contains human-readable text, usually in small
 *  quantities. The content of Text constructs is Language-Sensitive.
 * <p/>
 *  atomPlainTextConstruct =
 *     atomCommonAttributes,
 *     attribute type { "text" | "html" }?,
 *     text
 *
 *  atomXHTMLTextConstruct =
 *    atomCommonAttributes,
 *    attribute type { "xhtml" },
 *    xhtmlDiv 
 * <p/>
 *  atomTextConstruct = atomPlainTextConstruct | atomXHTMLTextConstruct
 * <p/>
 * </pre>
 *
 * @author <a href="mailto:mail@johannes-beck.name">Johannes Beck</a>
 * @version $Revision: 1 $
 */
@XmlAccessorType(XmlAccessType.PROPERTY)
public class Text extends CommonAttributes 
{
  
  private String type;

  private MediaType mediaType;

  private String text;

  private Element element;

  private List<Object> value;

  private Object jaxbObject;

  protected JAXBContextFinder finder;

  public Text()
  {
  }

  public Text(String text, String type)
  {
     setText(text);
     setRawType(type);
  }

  public Text(String text)
  {
    setText(text);
  }  
  
  protected void setFinder(JAXBContextFinder finder)
  {
     this.finder = finder;
  }

  @XmlAnyElement
  @XmlMixed
  public List<Object> getValue()
  {
     return value;
  }

  public void setValue(List<Object> value)
  {
     this.value = value;
  }
    
  /**
   * Mime type 
   *
   * @return
   */
  @XmlTransient
  public MediaType getType()
  {
     if (mediaType == null)
     {
        if (type.equals("html")) mediaType = MediaType.TEXT_HTML_TYPE;
        else if (type.equals("text")) mediaType = MediaType.TEXT_PLAIN_TYPE;
        else if (type.equals("xhtml")) mediaType = MediaType.APPLICATION_XHTML_XML_TYPE;
        else mediaType = MediaType.valueOf(type);
     }
     return mediaType;
  }

  public void setType(MediaType type)
  {
     mediaType = type;
     if (type.equals(MediaType.TEXT_PLAIN_TYPE)) this.type = "text";
     else if (type.equals(MediaType.TEXT_HTML_TYPE)) this.type = "html";
     else if (type.equals(MediaType.APPLICATION_XHTML_XML_TYPE)) this.type = "xhtml";
     else this.type = type.toString();
  }
  
  @XmlAttribute(name = "type")
  public String getRawType()
  {
     return type;
  }

  public void setRawType(String type)
  {
     this.type = type;
  }
  
  /**
   * If content is text, return it as a String.  Otherwise, if content is not text this will return null.
   *
   * @return
   */
  @XmlTransient
  public String getText()
  {
     if (value == null) return null;
     if (value.size() == 0) return null;
     if (text != null) return text;
     StringBuffer buf = new StringBuffer();
     for (Object obj : value)
     {
        if (obj instanceof String) buf.append(obj.toString());
     }
     text = buf.toString();
     return text;
  }
  
  /**
   * Set content as text
   *
   * @param text
   */
  public void setText(String text)
  {
     if (value == null) value = new ArrayList();
     if (this.text != null && value != null) value.clear();
     this.text = text;
     value.add(text);
  }

  /**
   * Get content as an XML Element if the content is XML.  Otherwise, this will just return null.
   *
   * @return
   */
  @XmlTransient
  public Element getElement()
  {
     if (value == null) return null;
     if (element != null) return element;
     for (Object obj : value)
     {
        if (obj instanceof Element)
        {
           element = (Element) obj;
           return element;
        }
     }
     return null;
  }

  /**
   * Set the content to an XML Element
   *
   * @param element
   */
  public void setElement(Element element)
  {
     if (value == null) value = new ArrayList();
     if (this.element != null && value != null) value.clear();
     this.element = element;
     value.add(element);

  }
    
  /**
   * Extract the content as the provided JAXB annotated type.
   * <p/>
   * This method will use a cached JAXBContext used by the Resteasy JAXB providers
   * or, if those are not existent, it will create a new JAXBContext from scratch
   * using the class.
   *
   * @param clazz                class type you are expecting
   * @param otherPossibleClasses Other classe you want to create the JAXBContext with
   * @return null if there is no XML content
   * @throws JAXBException
   */
  public <T> T getJAXBObject(Class<T> clazz, Class... otherPossibleClasses) throws JAXBException
  {
     JAXBContext ctx = null;
     Class[] classes = {clazz};
     if (otherPossibleClasses != null && otherPossibleClasses.length > 0)
     {
        classes = new Class[1 + otherPossibleClasses.length];
        classes[0] = clazz;
        for (int i = 0; i < otherPossibleClasses.length; i++) classes[i + 1] = otherPossibleClasses[i];
     }
     if (finder != null)
     {
        ctx = finder.findCacheContext(MediaType.APPLICATION_XML_TYPE, null, classes);
     }
     else
     {
        ctx = JAXBContext.newInstance(classes);
     }
     if (getElement() == null) return null;
     Object obj = ctx.createUnmarshaller().unmarshal(getElement());
     if (obj instanceof JAXBElement)
     {
        jaxbObject = ((JAXBElement) obj).getValue();
        return (T) jaxbObject;
     }
     else
     {
        jaxbObject = obj;
        return (T) obj;
     }
  }

  /**
   * Returns previous extracted jaxbobject from a call to getJAXBObject(Class<T> clazz)
   * or value passed in through a previous setJAXBObject().
   *
   * @return
   */
  @XmlTransient
  public Object getJAXBObject()
  {
     return jaxbObject;
  }

  public void setJAXBObject(Object obj)
  {
     if (value == null) value = new ArrayList();
     if (jaxbObject != null && value != null) value.clear();
     if (!obj.getClass().isAnnotationPresent(XmlRootElement.class) && obj.getClass().isAnnotationPresent(XmlType.class))
     {
        value.add(JAXBXmlTypeProvider.wrapInJAXBElement(obj, obj.getClass()));
     }
     else
     {
        value.add(obj);
     }
     jaxbObject = obj;
  }  
}
