/**
 * License Agreement.
 *
 * Rich Faces - Natural Ajax for Java Server Faces (JSF)
 *
 * Copyright (C) 2007 Exadel, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 */
package org.richfaces.renderkit;

import java.io.IOException;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import javax.faces.component.UIComponent;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.convert.Converter;

import org.ajax4jsf.component.UIDataAdaptor;
import org.ajax4jsf.javascript.JSFunctionDefinition;
import org.ajax4jsf.javascript.JSReference;
import org.ajax4jsf.javascript.ScriptString;
import org.ajax4jsf.javascript.ScriptUtils;
import org.ajax4jsf.renderkit.ComponentVariables;
import org.ajax4jsf.renderkit.ComponentsVariableResolver;
import org.ajax4jsf.renderkit.RendererUtils.HTML;
import org.richfaces.component.UIOrderingBaseComponent;
import org.richfaces.component.UIOrderingBaseComponent.ItemState;
import org.richfaces.component.util.MessageUtil;

/**
 * @author Nick Belaevski
 * 
 */
public abstract class OrderingComponentRendererBase extends
		AbstractRowsRenderer {

	private static final Converter DEFAULT_CONVERTER = new Converter() {

		public Object getAsObject(FacesContext context, UIComponent component,
				String value) {

			return value;
		}

		public String getAsString(FacesContext context, UIComponent component,
				Object value) {
			if (value instanceof String) {
				return (String) value;
			}

			if (null == value) {
				return "";
			}

			return value.toString();
		}

	};

	private static final String ITEM_STATE_VAR_NAME = "itemState";

	protected final static String SHOW_LABELS_ATTRIBUTE_NAME = "showButtonLabels";

	protected final static String ATTRIBUTE_CE_ONHEADERCLICK = "onheaderclick";

	protected final static String CONTROL_TYPE_LINK = "link";

	protected final static String CONTROL_TYPE_BUTTON = "button";

	protected final static String CONTROL_TYPE_NONE = "none";

	protected final static String ATTRIBUTE_CONTROLS_TYPE = "controlsType";

	protected static abstract class ControlsHelper {
		private String name;

		private String bundlePropertyName;

		private String imageURI;

		private String facetName;

		private String styleClassName;

		private String idSuffix;

		String customEvent;

		String styleFromAttribute;

		private String buttonStyleClass;

		boolean enable;

		private String defaultText;

		private String labelAttributeName;
		
		private String title;

		public abstract boolean isRendered(FacesContext context,
				UIComponent component);

		public ControlsHelper(String name, String bundlePropertyName,
				String defaultText, String imageURI, String facetName,
				String styleClassName, String styleFromAttribute,
				String buttonStyleClass, String idSuffix, String customEvent,
				boolean isEnable, String labelAttributeName, String  title) {
			super();
			this.name = name;
			this.bundlePropertyName = bundlePropertyName;
			this.defaultText = defaultText;
			this.imageURI = imageURI;
			this.facetName = facetName;
			this.styleClassName = styleClassName;
			this.styleFromAttribute = styleFromAttribute;
			this.idSuffix = idSuffix;
			this.customEvent = customEvent;
			this.buttonStyleClass = buttonStyleClass;
			this.enable = isEnable;
			this.labelAttributeName = labelAttributeName;
			this.title = title;
		}

		public String getName() {
			return name;
		}

		public String getBundlePropertyName() {
			return bundlePropertyName;
		}

		public String getImageURI() {
			return imageURI;
		}

		public String getFacetName() {
			return facetName;
		}

		public String getStyleClassName() {
			return styleClassName;
		}

		public String getIdSuffix() {
			return idSuffix;
		}

		public String getCustomEvent() {
			return customEvent;
		}

		public String getStyleFromAttribute() {
			return styleFromAttribute;
		}

		public String getButtonStyleClass() {
			return buttonStyleClass;
		}

		public boolean isEnable() {
			return enable;
		}

		public String getDefaultText() {
			return defaultText;
		}

		public String getLabelAttributeName() {
			return labelAttributeName;
		}

        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }
	}

	protected static final class SelectionState {

		private boolean firstSelected = false;
		private boolean firstSelectedLatch = false;

		private boolean selectedLatch = false;

		private boolean itemsExist = false;

		private boolean lastSelected = false;

		public SelectionState() {
			super();
		}

		public void addState(boolean selected) {
			itemsExist = true;

			if (!firstSelectedLatch) {
				firstSelected = selected;
				firstSelectedLatch = true;
			}

			if (selected) {
				selectedLatch = true;
			}

			lastSelected = selected;
		}

		public boolean isFirstSelected() {
			return firstSelected;
		}

		public boolean isSelected() {
			return selectedLatch;
		}

		public boolean isItemExist() {
			return itemsExist;
		}

		public boolean isLastSelected() {
			return lastSelected;
		}
	}

	private final String bundleName;

	public OrderingComponentRendererBase(String bundleName) {
		super();

		this.bundleName = bundleName;
	}

	public void encodeCaption(FacesContext context, UIComponent component)
			throws IOException {
		encodeCaption(context, component,
				OrderingComponentControlsHelper.FACET_CAPTION,
				"rich-ordering-list-caption");
	}

	protected void encodeCaption(FacesContext context, UIComponent component,
			String facetCaption, String captionStyle, String attributeName)
			throws IOException {
		ResponseWriter writer = context.getResponseWriter();
		UIComponent facetEl = component.getFacet(facetCaption);
		boolean renderFacet = ((facetEl != null) && facetEl.isRendered());
		String captionAttr = (String) component.getAttributes().get(
				attributeName);

		if (renderFacet || (captionAttr != null)) {
			writer.startElement(HTML.DIV_ELEM, component);
			writer.writeAttribute(HTML.class_ATTRIBUTE, captionStyle, null);
			if (renderFacet) {
				renderChild(context, facetEl);
			} else {
				writer.write(captionAttr);
			}
			writer.endElement(HTML.DIV_ELEM);
		}
	}

	protected void encodeCaption(FacesContext context, UIComponent component,
			String facetCaption, String captionStyle) throws IOException {
		encodeCaption(context, component, facetCaption, captionStyle,
				OrderingComponentControlsHelper.ATTRIBUTE_CAPTION_LABEL);
	}

	public void encodeHeader(FacesContext context,
			UIOrderingBaseComponent component) throws IOException {
		encodeHeader(context, component, "rich-ordering-list-table-header",
				"rich-ordering-list-table-header-cell", "headerClass");
	}

	protected void encodeHeader(FacesContext context,
			UIOrderingBaseComponent component, String rowClass,
			String cellClass, String headerClassAttr) throws IOException {
		ResponseWriter writer = context.getResponseWriter();
		// UIComponent header = orderingList.getHeader();
		Iterator headers = component.columns();

		if (headers.hasNext()) {
			writer.startElement("thead", component);
			String headerClass = (String) component.getAttributes().get(
					headerClassAttr);

			writer.startElement("tr", component);
			encodeStyleClass(writer, null, rowClass, null, headerClass);
			encodeHeaderFacets(context, writer, headers, cellClass,
					headerClass, "header", "th", component);

			writer.endElement("tr");

			writer.endElement("thead");
		}
	}

	protected void renderDefaultControl(FacesContext context,
			UIOrderingBaseComponent orderingList, ResponseWriter writer,
			boolean useFacet,
			OrderingComponentRendererBase.ControlsHelper helper,
			String clientId, ResourceBundle bundleExternal,
			ResourceBundle bundleApplication, boolean enabled,
			String baseStyle, String baseControlStyle) throws IOException {
		UIComponent facet = orderingList.getFacet(helper.getFacetName());
		String customEvent = null;
		Map attributes = orderingList.getAttributes();
		if (helper.customEvent != null) {
			customEvent = (String) attributes.get(helper.customEvent);
		}

		String styleFromAttribute = (String) attributes
				.get(helper.styleFromAttribute);

		String baseStyleLight = baseStyle.concat("-light");
		String baseStylePress = baseStyle.concat("-press");

		String currentStyle = baseControlStyle + helper.getStyleClassName();
		if (styleFromAttribute != null) {
			currentStyle = styleFromAttribute.concat(currentStyle);
		}

		writer.startElement(HTML.DIV_ELEM, orderingList);
		String controlId = clientId + helper.getIdSuffix();
		writer.writeAttribute(HTML.id_ATTRIBUTE, controlId, null); // FIXME:
		writer.writeAttribute(HTML.class_ATTRIBUTE, currentStyle, null);
		String style = null;
		if (enabled) {
			style = "display:block;";
		} else {
			style = "display:none;";
		}
		writer.writeAttribute(HTML.style_ATTRIBUTE, style, null);
		if (!useFacet) {

			writer.startElement(HTML.DIV_ELEM, orderingList);
			writer.writeAttribute(HTML.class_ATTRIBUTE, baseStyle
					+ helper.getButtonStyleClass(), null);
			if (helper.enable) {
				writer.writeAttribute(HTML.onmouseover_ATTRIBUTE,
						"this.className='" + baseStyleLight + "'", null);
				writer.writeAttribute(HTML.onmousedown_ATTRIBUTE,
						"this.className='" + baseStylePress + "'", null);
				writer.writeAttribute(HTML.onmouseup_ATTRIBUTE,
						"this.className='" + baseStyle + "'", null);
				writer.writeAttribute(HTML.onmouseout_ATTRIBUTE,
						"this.className='" + baseStyle + "'", null);
				
				writer.startElement(HTML.a_ELEMENT, orderingList);
				writer.writeAttribute(HTML.id_ATTRIBUTE, controlId + "link", null); // FIXME:
				//writer.writeAttribute(HTML.HREF_ATTR, "#", null);
				writer.writeAttribute(HTML.onclick_ATTRIBUTE, "return false;", null);
			
				writer.writeAttribute(HTML.class_ATTRIBUTE, baseStyle
						+ "-selection", null);
				writer.writeAttribute(HTML.onblur_ATTRIBUTE,
						"Richfaces.Control.onblur(this);", null);
				writer.writeAttribute(HTML.onfocus_ATTRIBUTE,
						"Richfaces.Control.onfocus(this);", null);
			}

			writer.startElement(HTML.DIV_ELEM, orderingList);
			writer.writeAttribute(HTML.class_ATTRIBUTE, baseStyle + "-content",
					null);

		}

		/*if (customEvent != null) {
			writer.writeAttribute(HTML.onclick_ATTRIBUTE, customEvent, null);
		}*/

		if (useFacet) {
			renderChild(context, facet);
		} else {
			writer.startElement(HTML.IMG_ELEMENT, orderingList);
			//buttons sometimes don't work under IE if mouse cursor 
			//is above some special areas of the button
			writer.writeAttribute(HTML.class_ATTRIBUTE, "rich-ordering-control-img", null);
		
			//writer.writeAttribute(HTML.width_ATTRIBUTE, "15", null);
			//writer.writeAttribute(HTML.height_ATTRIBUTE, "15", null);
			writer.writeAttribute(HTML.alt_ATTRIBUTE, 
			        orderingList.getAttributes().get(helper.getTitle()), null);
			writer.writeAttribute(HTML.src_ATTRIBUTE, getResource(
					helper.getImageURI()).getUri(context, null), null);

			writer.endElement(HTML.IMG_ELEMENT);

			if (getUtils().isBooleanAttribute(orderingList,
					SHOW_LABELS_ATTRIBUTE_NAME)) {
				String label = (String) attributes.get(helper
						.getLabelAttributeName());

				if (label == null) {
					if (null != bundleApplication) {
						try {
							label = bundleApplication.getString(helper
									.getBundlePropertyName());
						} catch (MissingResourceException e) {
							try {
								if (null != bundleExternal) {
									label = bundleExternal.getString(helper
											.getBundlePropertyName());
								}
							} catch (MissingResourceException exc) {
								// Key wasn't found, ignore this.
							}
						}

					} else if (null != bundleExternal) {
						try {
							label = bundleExternal.getString(helper
									.getBundlePropertyName());
						} catch (MissingResourceException exc) {
							// Key wasn't found, ignore this.
						}

					}

				}

				if (label == null) {
					label = helper.getDefaultText();
				}
				writer.writeText(label, null);
			}
		}
		// writer.writeAttribute(HTML.id_ATTRIBUTE, clientId +
		// helper.getIdSuffix(), null);

		// writer.writeAttribute(HTML.class_ATTRIBUTE, currentStyle, null);

		if (!useFacet) {
			writer.endElement(HTML.DIV_ELEM);
			if (helper.enable) {
				writer.endElement(HTML.a_ELEMENT);
			}
			writer.endElement(HTML.DIV_ELEM);
		}
		writer.endElement(HTML.DIV_ELEM);
	}

	protected boolean isHeaderExists(FacesContext context,
			UIOrderingBaseComponent component, String facetName) {
		Iterator headers = component.columns();
		while (headers.hasNext()) {
			UIComponent column = (UIComponent) headers.next();
			UIComponent facet = column.getFacet(facetName);
			if (facet != null) {
				return true;
			}
		}
		return false;
	}

	protected void encodeHeaderFacets(FacesContext context,
			ResponseWriter writer, Iterator headers, String skinCellClass,
			String headerClass, String facetName, String element,
			UIOrderingBaseComponent orderingList) throws IOException {
		while (headers.hasNext()) {
			UIComponent column = (UIComponent) headers.next();
			String classAttribute = facetName + "Class";
			String columnHeaderClass = (String) column.getAttributes().get(
					classAttribute);

			writer.startElement(element, column);
			if (!headers.hasNext()) {
				skinCellClass = skinCellClass + "-last";
			}
			encodeStyleClass(writer, null, skinCellClass, headerClass,
					columnHeaderClass);
			getUtils().encodeAttribute(context, column, "colspan");
			writer.startElement("div", column);
			writer.writeAttribute("style",
					"overflow:hidden;white-space: nowrap;", null);
			String onHeaderClickEvent = (String) orderingList.getAttributes()
					.get(ATTRIBUTE_CE_ONHEADERCLICK);
			if (onHeaderClickEvent != null) {
				writer.writeAttribute(HTML.onclick_ATTRIBUTE,
						onHeaderClickEvent, null);
			}

			UIComponent facet = column.getFacet(facetName);
			if (facet != null && facet.isRendered()) {
				renderChild(context, facet);
			} else {
				writer.write("&nbsp;");
			}

			writer.endElement("div");
			writer.endElement(element);
		}
	}

	protected void encodeControlFacet(FacesContext context,
			UIOrderingBaseComponent orderingList,
			OrderingComponentRendererBase.ControlsHelper helper,
			String clientId, ResponseWriter writer, boolean enabled,
			String baseStyle, String baseControlStyle) throws IOException {
		Locale locale = null;

		UIViewRoot viewRoot = context.getViewRoot();
		if (viewRoot != null) {
			locale = viewRoot.getLocale();
		}

		ClassLoader contextClassLoader = Thread.currentThread()
				.getContextClassLoader();
		ResourceBundle bundleExternal = null;
		ResourceBundle bundleApplication = null;
		String messageBundle = context.getApplication().getMessageBundle();
		if (locale != null) {
			if (null != messageBundle) {
				bundleApplication = ResourceBundle.getBundle(messageBundle,
						locale, contextClassLoader);
			}

			try {
				bundleExternal = ResourceBundle.getBundle(bundleName, locale,
						contextClassLoader);
			} catch (MissingResourceException e) {
				// No external bundle was found, ignore this exception.
			}
		}

		Map attributes = orderingList.getAttributes();
		UIComponent facet = orderingList.getFacet(helper.getFacetName());
		boolean useFacet = (facet != null && facet.isRendered());
		String controlType = (String) attributes.get(ATTRIBUTE_CONTROLS_TYPE);

		if (CONTROL_TYPE_NONE.equals(controlType)) {
		    return;
		} else {
			renderDefaultControl(context, orderingList, writer, useFacet,
					     helper, clientId, bundleExternal, bundleApplication,
					     enabled, baseStyle, baseControlStyle);
		    
		}
	}

	public void encodeBegin(FacesContext context, UIComponent component)
			throws IOException {
		UIOrderingBaseComponent orderingComponent = (UIOrderingBaseComponent) component;
		ComponentVariables variables = ComponentsVariableResolver.getVariables(
				this, component);
		variables.setVariable(ITEM_STATE_VAR_NAME, orderingComponent
				.getItemState());

		super.encodeBegin(context, component);
	}

	protected ItemState getItemState(FacesContext context,
			UIComponent component, ComponentVariables variables)
			throws IOException {
		return (ItemState) variables.getVariable(ITEM_STATE_VAR_NAME);
	}

	protected Converter getConverter(FacesContext context,
			UIOrderingBaseComponent component, boolean warnOnDefaultConverter) {
		Converter converter = component.getConverter();

		if (converter == null) {
			converter = component.getConverterForValue(context);
		}

		if (converter == null) {
			converter = DEFAULT_CONVERTER;
			
			if (warnOnDefaultConverter) {
				Object componentLabel = MessageUtil.getLabel(context, component);
				context.getExternalContext().log("Converter for component [" + componentLabel + 
					"] cannot be discovered, so default implementation of converter will be used." +
					" Component items will be converted to String on decoding.");
			}
		}

		return converter;
	}

	public String getCaptionDisplay(FacesContext context, UIComponent component) {
		Object caption = component.getAttributes().get(
				OrderingComponentControlsHelper.ATTRIBUTE_CAPTION_LABEL);
		UIComponent facet = component
				.getFacet(OrderingComponentControlsHelper.FACET_CAPTION);

		if ((null != caption && !"".equals(caption))
				|| (null != facet && facet.isRendered())) {
			return "";
		}
		return "display: none;";
	}

	public String getAsEventHandler(FacesContext context,
			UIComponent component, String attributeName) {
		String event = (String) component.getAttributes().get(attributeName);
		ScriptString result = JSReference.NULL;

		if (event != null) {
			event = event.trim();

			if (event.length() != 0) {
				JSFunctionDefinition function = new JSFunctionDefinition();
				function.addParameter("event");
				function.addToBody(event);

				result = function;
			}
		}

		return ScriptUtils.toScript(result);
	}

	public String getColumnClassesAsJSArray(FacesContext context,
			UIComponent component) {
		return ScriptUtils.toScript(getClassesAsList(context, component,
				"columnClasses"));
	}

	public String getRowClassesAsJSArray(FacesContext context,
			UIComponent component) {
		return ScriptUtils.toScript(getClassesAsList(context, component,
				"rowClasses"));
	}

	protected List getClassesAsList(FacesContext context,
			UIComponent component, String attr) {

		String value = (String) ((UIDataAdaptor) component).getAttributes()
				.get(attr);
		if (value != null && (value.length() != 0)) {
			return Arrays.asList(value.split(","));
		}
		return null;
	}
}
