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package com.sun.faces.application;

import javax.faces.FacesException;
import javax.faces.application.Application;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.component.UIInput;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;

import com.sun.faces.util.MessageFactory;
import com.sun.faces.util.RequestStateManager;

/**
 * Helper class to aid the ConverterPropertyEditorBase in converting
 * properties.
 *
 * @author Mike Youngstrom
 */
public class PropertyEditorHelper {

    private Application app;

    public PropertyEditorHelper(Application app) {
        this.app = app;
    }

    /**
     * Convert the textValue to an object of type targetClass by
     * delegating to a converter.
     */
    public Object convertToObject(Class targetClass, String textValue) {
        UIComponent component = getComponent();
        Converter converter = app.createConverter(targetClass);
        if (null == converter) {
            // PENDING(edburns): I18N
            FacesException e = new FacesException(
                  "Cannot create Converter to convert value "
                  + textValue
                  + " to instance of target class "
                  + targetClass.getName()
                  + '.');
            throw e;
        }
        FacesContext currentInstance = FacesContext.getCurrentInstance();
        try {
            return converter.getAsObject(currentInstance, component, textValue);
        } catch (ConverterException ce) {
            addConversionErrorMessage(currentInstance, component, ce);
            return null;
        }
    }

    /**
     * Convert an object of type targetClass to text by delegating to a converter
     * obtained from the Faces application.
     */
    public String convertToString(Class targetClass, Object value) {
        UIComponent component = getComponent();
        Converter converter = app.createConverter(targetClass);
        if (null == converter) {
            // PENDING(edburns): I18N
            throw new FacesException("Cannot create Converter to convert "
                                     + targetClass.getName()
                                     + " value "
                                     + value
                                     + " to string.");
        }
        FacesContext currentInstance = FacesContext.getCurrentInstance();
        try {
            return converter.getAsString(currentInstance, component, value);
        } catch (ConverterException ce) {
            addConversionErrorMessage(currentInstance, component, ce);
            return null;
        }
    }

    /**
     * Return the {@link javax.faces.component.UIComponent} that is currently being
     * processed.
     *
     * @return the current component, or null.
     */
    protected UIComponent getComponent() {
        FacesContext context = FacesContext.getCurrentInstance();
        if (context != null) {
            return ((UIComponent) RequestStateManager
                  .get(context, RequestStateManager.TARGET_COMPONENT_ATTRIBUTE_NAME));
        }
        return null;
    }

    /**
     * Add a conversion error message in the case of a PropertyEditor based
     * conversion error.
     *
     * @param context
     * @param component
     * @param ce
     */
    protected void addConversionErrorMessage(FacesContext context,
                                             UIComponent component,
                                             ConverterException ce) {
        String converterMessageString = null;
        FacesMessage message;
        UIInput input;
        if (component instanceof UIInput) {
            input = (UIInput) component;
            converterMessageString = input.getConverterMessage();
            input.setValid(false);
        }
        if (null != converterMessageString) {
            message =
                  new FacesMessage(FacesMessage.SEVERITY_ERROR, converterMessageString, converterMessageString);
        } else {
            message = ce.getFacesMessage();
            if (message == null) {
                message = MessageFactory
                      .getMessage(context, UIInput.CONVERSION_MESSAGE_ID);
                if (message.getDetail() == null) {
                    message.setDetail(ce.getMessage());
                }
            }
        }
        context.addMessage(component != null
                           ? component.getClientId(context) : null, message);
	}
}