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package com.sun.jersey.server.linking.impl;

import com.sun.jersey.core.reflection.AnnotatedMethod;
import com.sun.jersey.core.reflection.MethodList;
import com.sun.jersey.server.linking.Binding;
import com.sun.jersey.server.linking.Ref;
import java.lang.reflect.Field;
import java.net.URI;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.Path;

/**
 * Utility class for working with {@link Ref} annotated fields
 * @author mh124079
 */
public class RefFieldDescriptor extends FieldDescriptor implements RefDescriptor {

    private Ref link;
    private Class<?> type;
    private Map<String, String> bindings;

    public RefFieldDescriptor(Field f, Ref l, Class<?> t) {
        super(f);
        link = l;
        type = t;
        bindings = new HashMap<String, String>();
        for (Binding binding: l.bindings()) {
            bindings.put(binding.name(), binding.value());
        }
    }
    
    public void setPropertyValue(Object instance, URI value) {
        setAccessibleField(field);
        try {
            field.set(instance, type.equals(URI.class) ? value : value.toString());
        } catch (IllegalArgumentException ex) {
            Logger.getLogger(RefFieldDescriptor.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(RefFieldDescriptor.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public Ref.Style getLinkStyle() {
        return link.style();
    }

    public String getLinkTemplate() {
        return getLinkTemplate(link);
    }

    public static String getLinkTemplate(Ref link) {
        String template = null;
        if (!link.resource().equals(Class.class)) {
            // extract template from specified class' @Path annotation
            Path path = link.resource().getAnnotation(Path.class);
            template = path==null ? "" : path.value();
            if (link.method().length() > 0) {
                // append value of method's @Path annotation
                MethodList methods = new MethodList(link.resource());
                methods = methods.hasAnnotation(Path.class);
                Iterator<AnnotatedMethod> iterator = methods.iterator();
                while (iterator.hasNext()) {
                    AnnotatedMethod method = iterator.next();
                    if (!method.getMethod().getName().equals(link.method()))
                        continue;
                    Path methodPath = method.getAnnotation(Path.class);
                    String methodTemplate = methodPath.value();
                    StringBuilder builder = new StringBuilder();
                    builder.append(template);
                    if (!(template.endsWith("/") || methodTemplate.startsWith("/")))
                        builder.append("/");
                    builder.append(methodTemplate);
                    template = builder.toString();
                    break;
                }
            }
        } else {
            template = link.value();
        }
        return template;
    }

    public String getBinding(String name) {
        return bindings.get(name);
    }

    public String getCondition() {
        return link.condition();
    }
}
