/*
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * "The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations under
 * the License.
 *
 * The Original Code is ICEfaces 1.5 open source software code, released
 * November 5, 2006. The Initial Developer of the Original Code is ICEsoft
 * Technologies Canada, Corp. Portions created by ICEsoft are Copyright (C)
 * 2004-2006 ICEsoft Technologies Canada, Corp. All Rights Reserved.
 *
 * Contributor(s): _____________________.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"
 * License), in which case the provisions of the LGPL License are
 * applicable instead of those above. If you wish to allow use of your
 * version of this file only under the terms of the LGPL License and not to
 * allow others to use your version of this file under the MPL, indicate
 * your decision by deleting the provisions above and replace them with
 * the notice and other provisions required by the LGPL License. If you do
 * not delete the provisions above, a recipient may use your version of
 * this file under either the MPL or the LGPL License."
 *
 */

package com.icesoft.faces.component.style;

import com.icesoft.faces.context.DOMContext;
import com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer;
import com.icesoft.faces.renderkit.dom_html_basic.HTML;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.w3c.dom.Element;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpServletRequest;
import java.beans.Beans;
import java.io.IOException;

/**
 * Created by IntelliJ IDEA. User: rmayhew Date: May 30, 2006 Time: 3:59:37 PM
 * To change this template use File | Settings | File Templates.
 */
public class OutputStyleRenderer extends DomBasicRenderer {

    private static Log log = LogFactory.getLog(OutputStyleRenderer.class);
    private static final String IE_EXTENTION = "_ie";
    private static final String IE_7_EXTENTION = "_ie7";
    private static final String SAFARI_EXTENTION = "_safari";
    private static final String CSS_EXTENTION = ".css";
    private static final String DT_EXTENTION = "_dt";

    private static final int DEFAULT_TYPE = 0;
    private static final int IE = 1;    
    private static final int SAFARI = 2;
    private static final int DT = 3;
    private static final int IE_7 = 4;

    public void encodeEnd(FacesContext facesContext, UIComponent uiComponent)
            throws IOException {
        validateParameters(facesContext, uiComponent, OutputStyle.class);
        try {
            DOMContext domContext =
                    DOMContext.attachDOMContext(facesContext, uiComponent);
            if (!domContext.isInitialized()) {
                OutputStyle outputStyle = (OutputStyle) uiComponent;
                Element styleEle = buildCssElement(domContext);
                String href = outputStyle.getHref();
                styleEle.setAttribute(HTML.HREF_ATTR, getResourceURL(facesContext,href));
                domContext.setRootNode(styleEle);
                int browserType = browserType(facesContext, uiComponent);
                if (browserType != DEFAULT_TYPE) {
                    if (href.endsWith(CSS_EXTENTION)) {
                        int i = href.indexOf(CSS_EXTENTION);
                        if (i > 0) {
                            String start = href.substring(0, i);
                            Element ieStyleEle = buildCssElement(domContext);
                            String extention = IE_EXTENTION;
                            if (browserType == SAFARI) {
                                extention = SAFARI_EXTENTION;
                            }
                            if (browserType == DT) {
                                extention = DT_EXTENTION;
                            }
                            if(browserType == IE_7){
                                extention = IE_7_EXTENTION;
                            }
                            String hrefURL = facesContext.getApplication().getViewHandler().getResourceURL(facesContext, start + extention + CSS_EXTENTION);
                            ieStyleEle.setAttribute(HTML.HREF_ATTR, hrefURL);
                            styleEle.getParentNode().appendChild(ieStyleEle);
                        } else {
                            throw new RuntimeException(
                                    "OutputStyle file attribute is too short. " +
                                    "Needs at least one character before .css. Current Value is [" +
                                    href + "]");
                        }
                    } else {
                        throw new RuntimeException(
                                "OutputStyle file attribute must end in .css. " +
                                "Current Value is [" + href + "]");
                    }
                }

            }
            domContext.stepOver();
            domContext.streamWrite(facesContext, uiComponent);
        } catch (Exception e) {
            log.error("Error in OutputStyleRenderer", e);
        }
    }

    private Element buildCssElement(DOMContext domContext) {
        Element styleEle = domContext.createElement("link");
        styleEle.setAttribute(HTML.REL_ATTR, "stylesheet");
        styleEle.setAttribute(HTML.TYPE_ATTR, "text/css");
        return styleEle;
    }

    private int browserType(FacesContext facesContext, UIComponent uiComponent) {
        int result = DEFAULT_TYPE;
        String useragent = ((OutputStyle)uiComponent).getUserAgent();
        if(useragent != null){
            return _browserType(useragent);
        }

        Object o = facesContext.getExternalContext().getRequest();
        if (o != null) {
            if (o instanceof HttpServletRequest) {
                HttpServletRequest request = (HttpServletRequest) o;
                useragent = request.getHeader("user-agent");
                if(useragent == null){
                    useragent = ((OutputStyle)uiComponent).getUserAgent();
                }
                if(useragent == null){
                    log.warn("Not able to find user agent. Returning default");
                    return DEFAULT_TYPE;
                }
                if(((OutputStyle)uiComponent).getUserAgent() == null){
                    ((OutputStyle)uiComponent).setUserAgent(useragent.toLowerCase());
                }
                String user = useragent.toLowerCase();
                result = _browserType( user);

            } else {
                log.error(
                        "OutputStyleRenderer: Request is not HttpServletRequest. Its [" +
                        o.getClass().getName() + "]");
            }
        } else {
            log.error(
                    "IceStyleReader: facesContext.getExternalContext().getRequest() is null");
        }
        return result;
    }

    private int _browserType(String user) {
        int result = DEFAULT_TYPE;
        if (Beans.isDesignTime()) {
            result = DT;
        } else {
            if (user.indexOf("msie") != -1) {
                result = IE;
                if(user.indexOf("msie 7") != -1){
                    result = IE_7;
                }
            } else if (user.indexOf("safari") != -1) {
                result = SAFARI;
            }
        }
        return result;
    }
}