package pt.ist.renderers;

import java.util.Collection;

import pt.ist.renderers.components.HtmlActionLink;
import pt.ist.renderers.components.HtmlComponent;
import pt.ist.renderers.components.HtmlContainer;
import pt.ist.renderers.components.HtmlImage;
import pt.ist.renderers.components.HtmlInlineContainer;
import pt.ist.renderers.components.HtmlLink;
import pt.ist.renderers.components.HtmlText;
import pt.ist.renderers.components.state.ViewDestination;
import pt.ist.renderers.layouts.Layout;
import pt.ist.renderers.utils.RenderUtils;

/**
 * This renderer provides a tabular presentation for a collection that allows
 * rows of the table to be sorted by clicking the table headers. The behaviour
 * of this renderer is very similar to the one of
 * {@link pt.ist.renderers.CollectionRenderer}.
 * 
 * <p>
 * Example:
 * <table border="1">
 * <thead>
 * <th><a href="#">Name</a></th>
 * <th>V <a href="#">Age</a></th>
 * </thead>
 * <tr>
 * <td>Name A</td>
 * <td>20</td>
 * </tr>
 * <tr>
 * <td>Name C</td>
 * <td>21</td>
 * </tr>
 * <tr>
 * <td>Name B</td>
 * <td>22</td>
 * </tr>
 * </table>
 * 
 * @author cfgi
 */
public class OrderableCollectionRenderer extends CollectionRenderer {

    static private final String AL_ON_CLICK = "document.getElementById('%s').%s.value='%s=%s';";

    private String sortFormId;

    private boolean sortActionLink = false;

    private String sortUrl;

    private String sortParameter;

    private String ascendingClasses;

    private String descendingClasses;

    private String ascendingImage;

    private String descendingImage;

    private boolean contextRelative;

    private String sortableSlots;

    private boolean sortIgnored;

    public boolean isSortIgnored() {
	return sortIgnored;
    }

    /**
     * 
     * @property
     */
    public void setSortIgnored(boolean sortIgnored) {
	this.sortIgnored = sortIgnored;
    }

    public OrderableCollectionRenderer() {
	setContextRelative(true);
    }

    public String getAscendingClasses() {
	return this.ascendingClasses;
    }

    public String getDescendingClasses() {
	return this.descendingClasses;
    }

    public String getAscendingImage() {
	return this.ascendingImage;
    }

    public String getDescendingImage() {
	return this.descendingImage;
    }

    public boolean isContextRelative() {
	return this.contextRelative;
    }

    public String getSortFormId() {
	return sortFormId;
    }

    /**
     * Represents the form id used when generated link is an action link.
     * 
     * @property
     */
    public void setSortFormId(String sortFormId) {
	this.sortFormId = sortFormId;
    }

    public boolean isSortActionLink() {
	return sortActionLink;
    }

    /**
     * If <code>true</code>, generate link as an action link. Must also set sort
     * form id property value, that indicates which form to submit.
     * 
     * @property
     */
    public void setSortActionLink(boolean sortActionLink) {
	this.sortActionLink = sortActionLink;
    }

    public String getSortUrl() {
	return this.sortUrl;
    }

    /**
     * Indicates the url used to sort collection. Must be setted if action link
     * is not used.
     * 
     * @property
     */
    public void setSortUrl(String sortUrl) {
	this.sortUrl = sortUrl;
    }

    public String getSortParameter() {
	return this.sortParameter;
    }

    /**
     * Specify the parameter value used to sort collection
     * 
     * @property
     */
    public void setSortParameter(String sortParameter) {
	this.sortParameter = sortParameter;
    }

    /**
     * The classes to use in a header when the corresponding column is ordered
     * in <strong>ascending</strong> mode. This property can be used to use a
     * custom style that denotes an ascending ordering.
     * 
     * @property
     */
    public void setAscendingClasses(String ascendingClasses) {
	this.ascendingClasses = ascendingClasses;
    }

    /**
     * The classes to use in a header when the corresponding column is ordered
     * in <strong>descending</strong> mode. This property can be used to use a
     * custom style that denotes an descending ordering.
     * 
     * @property
     */
    public void setDescendingClasses(String descendingClasses) {
	this.descendingClasses = descendingClasses;
    }

    /**
     * If this property is specified an image will be placed to the left of the
     * header title. This image will be used when the header is clicked and the
     * ordering is <strong>ascending</strong>.
     * 
     * @property
     */
    public void setAscendingImage(String ascendingImage) {
	this.ascendingImage = ascendingImage;
    }

    /**
     * If this property is specified an image will be placed to the left of the
     * header title. This image will be used when the header is clicked and the
     * ordering is <strong>descending</strong>.
     * 
     * @property
     */
    public void setDescendingImage(String descendingImage) {
	this.descendingImage = descendingImage;
    }

    /**
     * This property specifies whether the image url given in
     * {@link #setAscendingImage(String) ascendingImage} or
     * {@link #setDescendingImage(String) descendingImage} is relative to the
     * application context or not.
     * 
     * @property
     */
    public void setContextRelative(boolean contextRelative) {
	this.contextRelative = contextRelative;
    }

    public String getSortableSlots() {
	return sortableSlots;
    }

    /**
     * Colon separated values of slot names. If this property is not specified
     * then all slots are considered sortable. If this property is sent then
     * only the slots indicated are sortable.
     * <p>
     * Example: <code>"a, b, c"</code>
     * 
     * @property
     */
    public void setSortableSlots(String sortableSlots) {
	this.sortableSlots = sortableSlots;
    }

    private String getImagePath(String path) {
	if (isContextRelative()) {
	    return getContext().getViewState().getRequest().getContextPath() + path;
	} else {
	    return path;
	}
    }

    @Override
    protected Layout getLayout(Object object, Class type) {
	Collection sortedCollection = (isSortIgnored()) ? (Collection) object : RenderUtils.sortCollectionWithCriteria(
		(Collection) object, getSortBy());

	return new OrderedCollectionTabularLayout(sortedCollection);
    }

    protected class OrderedCollectionTabularLayout extends CollectionTabularLayout {

	public OrderedCollectionTabularLayout(Collection object) {
	    super(object);
	}

	@Override
	protected HtmlComponent getHeaderComponent(int columnIndex) {
	    if (columnIndex == 0 && isCheckable()) {
		return new HtmlText();
	    } else if (columnIndex < getNumberOfColumns() - getNumberOfLinkColumns()) {
		HtmlComponent component = super.getHeaderComponent(columnIndex);
		String slotName = getObject(0).getSlots().get(columnIndex - (isCheckable() ? 1 : 0)).getName();

		if (!isSortable(slotName)) {
		    return component;
		}

		if (isSortActionLink()) {
		    return buildActionLink(component, slotName);
		}

		HtmlLink link = new HtmlLink();

		if (getSortUrl() != null) {
		    link.setUrl(getSortUrl());
		} else {
		    ViewDestination destination = getContext().getViewState().getInputDestination();

		    link.setModule(destination.getModule());
		    link.setUrl(destination.getPath());
		}

		link.setBody(component);

		if (getSortBy() != null && getSortBy().contains(slotName)) {
		    if (getSortBy().contains("=desc")) {
			link.setParameter(getSortParameter(), slotName + "=ascending");
			component = wrapComponent(link, false);
		    } else {
			link.setParameter(getSortParameter(), slotName + "=descending");
			component = wrapComponent(link, true);
		    }
		} else {
		    link.setParameter(getSortParameter(), slotName + "=ascending");
		    component = wrapComponent(link, false);
		}

		return component;
	    } else {
		return new HtmlText();
	    }
	}

	private HtmlComponent buildActionLink(final HtmlComponent component, final String slotName) {
	    final HtmlActionLink link = new HtmlActionLink();
	    link.setBody(component);

	    final HtmlComponent result;
	    if (getSortBy() != null && getSortBy().contains(slotName)) {
		if (getSortBy().contains("=desc")) {
		    link.setOnClick(String.format(AL_ON_CLICK, getSortFormId(), getSortParameter(), slotName, "asc"));
		    result = wrapComponent(link, false);
		} else {
		    link.setOnClick(String.format(AL_ON_CLICK, getSortFormId(), getSortParameter(), slotName, "desc"));
		    result = wrapComponent(link, true);
		}
	    } else {
		link.setOnClick(String.format(AL_ON_CLICK, getSortFormId(), getSortParameter(), slotName, "asc"));
		result = wrapComponent(link, false);
	    }

	    return result;
	}

	private boolean isSortable(String slotName) {
	    String sortableSlots = getSortableSlots();

	    if (sortableSlots == null) {
		return true;
	    }

	    String[] slots = sortableSlots.split(",");
	    for (int i = 0; i < slots.length; i++) {
		String trimmed = slots[i].trim();

		if (trimmed.length() == 0) {
		    continue;
		}

		if (trimmed.equals(slotName)) {
		    return true;
		}
	    }

	    return false;
	}

	private HtmlComponent wrapComponent(HtmlComponent component, boolean ascending) {
	    String image = null;

	    if (ascending) {
		if (getAscendingClasses() != null) {
		    component.setClasses(getAscendingClasses());
		}

		image = getAscendingImage();
	    } else {
		if (getDescendingClasses() != null) {
		    component.setClasses(getDescendingClasses());
		}

		image = getDescendingImage();
	    }

	    if (image == null) {
		return component;
	    }

	    HtmlContainer container = new HtmlInlineContainer();

	    HtmlImage htmlImage = new HtmlImage();
	    htmlImage.setSource(getImagePath(image));

	    container.addChild(htmlImage);
	    container.addChild(component);

	    return container;
	}

    }

}