package com.temp.client.foundation.widget.table.cell;

import com.google.gwt.cell.client.*;
import com.google.gwt.dom.client.*;
import com.google.gwt.safehtml.shared.*;
import com.google.gwt.user.client.ui.*;
import com.google.gwt.user.client.ui.HasHorizontalAlignment.*;
import com.temp.client.foundation.handler.*;

/**
 * @param <T> - the data type
 *
 * @author paule, dhoude
 */
public class ClickableImageCell<T> extends AbstractCell<T> {

    private DataClickHandler<T> clickHandler;
    private String trustedInnerHTML;
    private HorizontalAlignmentConstant horizontalAlignment;

    private static final String CLICK_EVENT = "click";
    private static final String TEXT_ALIGN_CSS_PROPERTY_NAME = "text-align";

    public ClickableImageCell( String trustedHtmlImageElement, DataClickHandler<T> clickHandler,
                               HorizontalAlignmentConstant horizontalAlignment ) {
        super( CLICK_EVENT );
        trustedInnerHTML = trustedHtmlImageElement;
        this.clickHandler = clickHandler;
        this.horizontalAlignment = horizontalAlignment;
    }

    public ClickableImageCell( String trustedHtmlImageElement, DataClickHandler<T> clickHandler ) {
        this( trustedHtmlImageElement, clickHandler, null );
    }

    public String getTrustedInnerHTML( T value ) {
        return trustedInnerHTML;
    }

    @Override
    public void render( Context context, T value, SafeHtmlBuilder sb ) {
        // Use concatenation here, since SafeHtmlBuilder only accept complete tags
        sb.appendHtmlConstant( "<div style='" + this.getHorizontalAlignmentStyle() + "'>" );
        sb.appendHtmlConstant( getTrustedInnerHTML( value ) );
        sb.appendHtmlConstant( "</div>" );
    }

    @Override
    public void onBrowserEvent( Context context, Element parent, T value, NativeEvent event, ValueUpdater<T> valueUpdater ) {
        if ( event.getType().equals( CLICK_EVENT ) && value != null ) {
            clickHandler.onClick( value );
        }
    }

    public void setHorizontalAlignment( HorizontalAlignmentConstant horizontalAlignment ) {
        this.horizontalAlignment = horizontalAlignment;
    }

    private String getHorizontalAlignmentStyle() {
        StringBuilder styleStringBuilder = new StringBuilder();

        if ( HasHorizontalAlignment.ALIGN_LEFT.equals( horizontalAlignment ) ) {
            styleStringBuilder.append( TEXT_ALIGN_CSS_PROPERTY_NAME );
            styleStringBuilder.append( ": left; " );
        } else if ( HasHorizontalAlignment.ALIGN_CENTER.equals( horizontalAlignment ) ) {
            styleStringBuilder.append( TEXT_ALIGN_CSS_PROPERTY_NAME );
            styleStringBuilder.append( ": center; " );
        } else if ( HasHorizontalAlignment.ALIGN_RIGHT.equals( horizontalAlignment ) ) {
            styleStringBuilder.append( TEXT_ALIGN_CSS_PROPERTY_NAME );
            styleStringBuilder.append( ": right; " );
        }

        return styleStringBuilder.toString();
    }
}