package org.gcube.informationsystem.types.impl;

import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.TypeVariable;
import java.util.HashSet;
import java.util.Set;

import org.gcube.informationsystem.base.impl.ISManageableImpl;
import org.gcube.informationsystem.base.reference.ISManageable;
import org.gcube.informationsystem.base.reference.entities.BaseEntity;
import org.gcube.informationsystem.base.reference.properties.BaseProperty;
import org.gcube.informationsystem.base.reference.relations.BaseRelation;
import org.gcube.informationsystem.model.reference.entities.Resource;
import org.gcube.informationsystem.types.TypeBinder;
import org.gcube.informationsystem.types.annotations.Abstract;
import org.gcube.informationsystem.types.annotations.ISProperty;
import org.gcube.informationsystem.types.impl.entities.EntityTypeDefinitionImpl;
import org.gcube.informationsystem.types.impl.properties.PropertyDefinitionImpl;
import org.gcube.informationsystem.types.impl.properties.PropertyTypeDefinitionImpl;
import org.gcube.informationsystem.types.impl.relations.RelationTypeDefinitionImpl;
import org.gcube.informationsystem.types.reference.TypeDefinition;
import org.gcube.informationsystem.types.reference.properties.PropertyDefinition;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;

// @JsonAutoDetect(fieldVisibility=JsonAutoDetect.Visibility.ANY)
@JsonTypeName(value=TypeDefinition.NAME)
public class TypeDefinitionImpl extends ISManageableImpl implements TypeDefinition {

	/**
	 * Generated Serial Version UID
	 */
	private static final long serialVersionUID = 2698204820689338513L;

	private static Logger logger = LoggerFactory.getLogger(TypeDefinitionImpl.class);
	
	public final static String DESCRIPTION = "DESCRIPTION";
	
	protected String name;
	protected String description;
	@JsonProperty(value="abstract")
	protected boolean abstractType;
	protected Set<String> superClasses;
	protected Set<PropertyDefinition> properties;
	
	protected static <ISM extends ISManageable> Set<String> retrieveSuperClasses(Class<? extends ISM> type, Class<ISM> baseClass, String topSuperClass){
		Set<String> interfaceList = new HashSet<>();
		
		if(type==baseClass){
			if(topSuperClass!=null) {
				interfaceList.add(topSuperClass);
			}
			return interfaceList;
		}
		
		Class<?>[] interfaces = type.getInterfaces();
		
		for (Class<?> interfaceClass : interfaces) {
			
			if(!baseClass.isAssignableFrom(interfaceClass)){
				continue;
			}
			
			@SuppressWarnings("unchecked")
			Class<? extends ISManageable> clz  = (Class<? extends ISManageable>) interfaceClass;
			interfaceList.add(TypeBinder.getType(clz));
		}

		return interfaceList;
	}
	
	private static Set<PropertyDefinition> retrieveListOfProperties(Class<?> type){
		Set<PropertyDefinition> properties = new HashSet<>();
		for (Method m : type.getDeclaredMethods()){
			m.setAccessible(true);
			if(m.isAnnotationPresent(ISProperty.class)){
				if(m.isBridge()) {
					continue;
				}
				ISProperty propAnnotation = m.getAnnotation(ISProperty.class);
				PropertyDefinition prop = new PropertyDefinitionImpl(propAnnotation, m);
				properties.add(prop);
				logger.trace("Property {} retrieved in type {} ", prop, type.getSimpleName());
			}  

		}
		return properties;
	}
	
	protected static Class<?> getGenericClass(java.lang.reflect.Type type){
		TypeVariable<?> typeVariable = (TypeVariable<?>) type;
		java.lang.reflect.Type[] bounds = typeVariable.getBounds();
		java.lang.reflect.Type t = bounds[0];
		if(t instanceof ParameterizedType) {
			ParameterizedType parameterizedType = (ParameterizedType) t;
			return (Class<?>) parameterizedType.getRawType();
		}
		return (Class<?>) t; 
	}
	
	@SuppressWarnings({"rawtypes", "unchecked"})
	public static TypeDefinition getInstance(Class<? extends ISManageable> clz) {
		if(BaseEntity.class.isAssignableFrom(clz)) {
			return new EntityTypeDefinitionImpl(clz);
		} else if(BaseRelation.class.isAssignableFrom(clz)){
			return new RelationTypeDefinitionImpl(clz);
		} else if(BaseProperty.class.isAssignableFrom(clz)){
			return new PropertyTypeDefinitionImpl(clz);
		} else if(TypeDefinition.class.isAssignableFrom(clz)) {
			return new TypeDefinitionImpl(clz);
		} else {
			throw new RuntimeException("Serialization required");
		}
	}
	
	protected TypeDefinitionImpl() {}
	
	protected TypeDefinitionImpl(Class<? extends ISManageable> clz) {
		this.name = TypeBinder.getType(clz);
		this.description = TypeBinder.getStaticStringFieldByName(clz, DESCRIPTION, "");
		this.abstractType = false;
		
		if(clz.isAnnotationPresent(Abstract.class)){
			this.abstractType = true;
		}
		
		if(!Resource.class.isAssignableFrom(clz)){
			this.properties = retrieveListOfProperties(clz);
		}
		
		logger.trace("{} : {} ", clz, this);
	}
	
	@Override
	public String getName() {
		return name;
	}

	@Override
	public String getDescription() {
		return description;
	}

	@Override
	public boolean isAbstract() {
		return abstractType;
	}

	@Override
	public Set<String> getSuperClasses() {
		return superClasses;
	}

	@Override
	public Set<PropertyDefinition> getProperties() {
		return properties;
	}
	
}