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package org.javimmutable.jackson;

import com.fasterxml.jackson.databind.BeanDescription;
import com.fasterxml.jackson.databind.DeserializationConfig;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.deser.Deserializers;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.type.CollectionLikeType;
import org.javimmutable.collections.Insertable;
import org.javimmutable.collections.JImmutableList;
import org.javimmutable.collections.JImmutableSet;
import org.javimmutable.collections.util.JImmutables;
import org.javimmutable.jackson.orderings.InsertOrderSet;
import org.javimmutable.jackson.orderings.SortedOrderSet;

/**
 * Deserializers implementation that creates InsertableDeserializers for JImmutableList
 * and JImmutableSet.  Recognizes annotations to create hash, tree, or insert order sets.
 */
public class JImmutableDeserializers
    extends Deserializers.Base
{
    @Override
    public JsonDeserializer findCollectionLikeDeserializer(CollectionLikeType type,
                                                              DeserializationConfig config,
                                                              BeanDescription beanDesc,
                                                              TypeDeserializer elementTypeDeserializer,
                                                              JsonDeserializer elementDeserializer)
        throws JsonMappingException
    {
        if (type.isTypeOrSubTypeOf(Insertable.class)) {
            if (type.isTypeOrSubTypeOf(JImmutableList.class)) {
                return new InsertableDeserializer<>(type, elementDeserializer, elementTypeDeserializer, false, JImmutables.list());
            } else if (type.isTypeOrSubTypeOf(JImmutableSet.class)) {
                if (type.isTypeOrSubTypeOf(SortedOrderSet.class)) {
                    requireCollectionOfComparableElements(type);
                    return new InsertableDeserializer<>(type, elementDeserializer, elementTypeDeserializer, false, JImmutables.sortedSet());
                } else if (type.isTypeOrSubTypeOf(InsertOrderSet.class)) {
                    return new InsertableDeserializer<>(type, elementDeserializer, elementTypeDeserializer, false, JImmutables.insertOrderSet());
                } else {
                    return new InsertableDeserializer<>(type, elementDeserializer, elementTypeDeserializer, false, JImmutables.set());
                }
            }
            throw new IllegalArgumentException("Class is not supported: " + type.getRawClass().getName());
        }
        return super.findCollectionLikeDeserializer(type, config, beanDesc, elementTypeDeserializer, elementDeserializer);
    }

    private void requireCollectionOfComparableElements(CollectionLikeType actualType)
    {
        Class elemType = actualType.getContentType().getRawClass();
        if (!Comparable.class.isAssignableFrom(elemType)) {
            throw new IllegalArgumentException("Can not handle JImmutables.sortedSet() with elements that are not Comparable (" + elemType.getName() + ")");
        }
    }
}