/*******************************************************************************
 * Copyright (c) 2012, 2013 Association for Decentralized Information Management in
 * Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.g3d.objmap.schema;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;

import org.simantics.db.ReadGraph;
import org.simantics.db.exception.DatabaseException;
import org.simantics.g3d.objmap.annotations.HasCollectionAdder;
import org.simantics.g3d.objmap.annotations.HasCollectionRemover;
import org.simantics.g3d.objmap.annotations.HasCollectionRuleFactory;
import org.simantics.g3d.objmap.annotations.HasGetSetRuleFactory;
import org.simantics.g3d.objmap.annotations.HasSetter;
import org.simantics.g3d.objmap.rules.factory.ICollectionRuleFactory;
import org.simantics.g3d.objmap.rules.factory.IGetSetRuleFactory;
import org.simantics.objmap.ILinkType;
import org.simantics.objmap.IMappingRule;
import org.simantics.objmap.annotations.GraphType;
import org.simantics.objmap.annotations.RelatedValue;
import org.simantics.objmap.annotations.meta.HasClassRuleFactory;
import org.simantics.objmap.annotations.meta.HasFieldRuleFactory;
import org.simantics.objmap.annotations.meta.HasMethodRuleFactory;
import org.simantics.objmap.schema.SimpleLinkType;

public class MappingSchemas {
	/**
     * Creates a new SimpleLinkType based on the annotations in the given class.
     * @throws IllegalAccessException 
     * @throws InstantiationException 
     * @see GraphType
     * @see RelatedValue
     */
	public static SimpleLinkType fromAnnotations(ReadGraph g, Class<?> clazz) throws DatabaseException, InstantiationException, IllegalAccessException {
	    GraphType graphType = clazz.getAnnotation(GraphType.class);
	    
	    ArrayList<IMappingRule> rules = new ArrayList<IMappingRule>();
	    collectRulesFromAnnotations(g, clazz, rules);
	    
	    return new SimpleLinkType(
	            g.getResource(graphType.value()), 
                clazz, rules);    
	}
	
	public static void collectRulesFromAnnotations(ReadGraph g, Class<?> clazz, Collection<IMappingRule> rules) throws DatabaseException, InstantiationException, IllegalAccessException {
	    Class<?> superclass = clazz.getSuperclass();
	    if(superclass != null)
	        collectRulesFromAnnotations(g, superclass, rules);
	        
        for(Annotation annotation : clazz.getAnnotations()) {
            HasClassRuleFactory factory = 
                annotation.annotationType().getAnnotation(HasClassRuleFactory.class);
            if(factory != null) {
                rules.add(factory.value().newInstance()
                        .create(g, annotation, clazz));
            }
        }

        for(Field f : clazz.getDeclaredFields()) {
            f.setAccessible(true);

            for(Annotation annotation : f.getAnnotations()) {
                HasFieldRuleFactory factory = 
                    annotation.annotationType().getAnnotation(HasFieldRuleFactory.class);
                if(factory != null) {
                    rules.add(factory.value().newInstance()
                            .create(g, annotation, f));
                }
            }
        }

        for(Method m : clazz.getDeclaredMethods()) {
            m.setAccessible(true);

            for(Annotation annotation : m.getAnnotations()) {
                HasMethodRuleFactory factory = 
                    annotation.annotationType().getAnnotation(HasMethodRuleFactory.class);
                if(factory != null) {
                	rules.add(factory.value().newInstance().create(g, annotation, m));
                }
            }
        }
        
        for (Method m : clazz.getDeclaredMethods()) {
        	m.setAccessible(true);
        	for (Annotation annotation : m.getAnnotations()) {
        		Class<? extends Annotation> annotationType = annotation.annotationType();
        		 HasGetSetRuleFactory factory = 
                         annotationType.getAnnotation(HasGetSetRuleFactory.class);
        		 if (factory != null) {
        			 
        			 HasSetter setterAnnType = annotationType.getAnnotation(HasSetter.class);
        			 
        			 Class<? extends Annotation> setterAnn = setterAnnType.value();
        			 
        			 IGetSetRuleFactory ruleFactory = factory.value().newInstance();
        			 
        			 Method getter = m;
        			 Method setter = null;
        			 
        			 for (Method m2 : clazz.getDeclaredMethods()) {
        				 Annotation set = m2.getAnnotation(setterAnn);
        				 if (set != null && ruleFactory.isSetter(annotation, set))
        					 setter = m2;
        			 }

        			 rules.add(ruleFactory.create(g, annotation, getter, setter));
        		 }
                
        	}
        }
        
        for (Method m : clazz.getDeclaredMethods()) {
        	m.setAccessible(true);
        	for (Annotation annotation : m.getAnnotations()) {
        		Class<? extends Annotation> annotationType = annotation.annotationType();
        		 HasCollectionRuleFactory factory = 
                         annotationType.getAnnotation(HasCollectionRuleFactory.class);
        		 if (factory != null) {
        			 
        			 HasCollectionAdder adderAnnType = annotationType.getAnnotation(HasCollectionAdder.class);
        			 HasCollectionRemover removerAnnType = annotationType.getAnnotation(HasCollectionRemover.class);
                
        			 Class<? extends Annotation> adderAnn = adderAnnType.value();
        			 Class<? extends Annotation> removerAnn = removerAnnType.value();
        			 
        			 ICollectionRuleFactory ruleFactory = factory.value().newInstance();
        			 
        			 Method getter = m;
        			 Method adder = null;
        			 Method remover = null;
        			 
        			 for (Method m2 : clazz.getDeclaredMethods()) {
        				 Annotation add = m2.getAnnotation(adderAnn);
        				 Annotation rem = m2.getAnnotation(removerAnn);
        				 if (add != null && ruleFactory.isAdder(annotation, add))
        					 adder = m2;
        				 if (rem != null && ruleFactory.isRemover(annotation, rem))
        					 remover = m2;
        			 }
        			 
        			 
        			 
        			 rules.add(ruleFactory.create(g, annotation, getter,adder,remover));
        		 }
                
        	}
        }
    }
	
	/**
     * Creates a new SimpleLinkType based on the annotations in the given class.
     * @throws IllegalAccessException 
     * @throws InstantiationException 
     * @see GraphType
     * @see RelatedValue
     */
	public static AdaptedLinkType fromAdaptable(ReadGraph g, String type, Class<?> clazz) throws DatabaseException, InstantiationException, IllegalAccessException {
	    
	    
	    return new AdaptedLinkType(g.getResource(type), clazz);    
	}
	
	
}