/**
 *
 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/
package lucee.runtime.tag;

import javax.servlet.http.HttpServletResponse;

import lucee.commons.io.CharsetUtil;
import lucee.commons.lang.CharSet;
import lucee.runtime.PageContextImpl;
import lucee.runtime.exp.PageException;
import lucee.runtime.exp.TemplateException;
import lucee.runtime.ext.tag.TagImpl;
import lucee.runtime.net.http.ReqRspUtil;

/**
* Generates custom HTTP response headers to return to the client.
*
*
*
**/
public final class Header extends TagImpl {

	/** A value for the HTTP header. This attribute is used in conjunction with the name attribute. */
	private String value="";

	/** Text that explains the status code. This attribute is used in conjunction with the 
	** 	statusCode attribute. */
	private String statustext;

	/** A name for the header. */
	private String name;

	/** A number that sets the HTTP status code. */
	private int statuscode;
	
	private boolean hasStatucCode;

    private CharSet charset;
    
	@Override
	public void release()	{
		super.release();
		value="";
		statustext=null;
		name=null;
		statuscode=0;
		hasStatucCode=false;
        charset=null;
	}


	/** set the value value
	*  A value for the HTTP header. This attribute is used in conjunction with the name attribute.
	* @param value value to set
	**/
	public void setValue(String value)	{
		this.value=value;
	}

	/** set the value statustext
	*  Text that explains the status code. This attribute is used in conjunction with the 
	* 	statusCode attribute.
	* @param statustext value to set
	**/
	public void setStatustext(String statustext)	{
		this.statustext=statustext;
	}

	/** set the value name
	*  A name for the header.
	* @param name value to set
	**/
	public void setName(String name)	{
		this.name=name;
	}

	/** set the value statuscode
	*  A number that sets the HTTP status code.
	* @param statuscode value to set
	**/
	public void setStatuscode(double statuscode)	{
		this.statuscode=(int) statuscode;
		hasStatucCode=true;
	}
    
    /**
     * @param charset The charset to set.
     */
    public void setCharset(String charset) {
        this.charset = CharsetUtil.toCharSet(charset);
    }


	@Override
	public int doStartTag() throws PageException	{
		
		HttpServletResponse rsp = pageContext. getHttpServletResponse();
		if(rsp.isCommitted())
			throw new TemplateException("can't assign value to header, header is alredy committed");
		
		// set name value
		if(name != null) {
            if(charset==null && name.equalsIgnoreCase("content-disposition")) {
                    charset=CharsetUtil.toCharSet(((PageContextImpl)pageContext).getWebCharset());
            }
            if(charset!=null) {
                name = new String(name.getBytes(CharsetUtil.toCharset(charset)), CharsetUtil.ISO88591);
                value = new String(value.getBytes(CharsetUtil.toCharset(charset)), CharsetUtil.ISO88591);
            }
            else {
                name = new String(name.getBytes(), CharsetUtil.ISO88591);
                value = new String(value.getBytes(), CharsetUtil.ISO88591);
            }
            
			if(name.toLowerCase().equals("content-type") && value.length()>0) {
                ReqRspUtil.setContentType(rsp,value);
				
            }
			else {
                rsp.addHeader(name, value);
            }
		}
		// set status
		if(hasStatucCode) {
    		if(statustext != null) {
    			//try {
    				///rsp.sendError(statuscode, statustext);
    				rsp.setStatus(statuscode,statustext);
    			/*} 
                catch (IOException e) {
    				throw new TemplateException("can't assign value to header, header is alredy committed",e.getMessage());
    			} */
            }
    		else {
                rsp.setStatus(statuscode);
            }
		}
		return SKIP_BODY;
	}

	@Override
	public int doEndTag()	{
		return EVAL_PAGE;
	}
}