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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.gravitee.management.rest.mapper;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.BeanDeserializerModifier;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.PropertyFilter;
import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;
import io.gravitee.definition.jackson.datatype.GraviteeMapper;
import io.gravitee.management.service.jackson.filter.ApiPermissionFilter;

import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.util.Collections;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author Nicolas GERAUD (nicolas.geraud at graviteesource.com)
 * @author GraviteeSource Team
 */
@Provider
public class ObjectMapperResolver implements ContextResolver {
    private final ObjectMapper mapper;

    public ObjectMapperResolver() {
        mapper = new GraviteeMapper();

        //because Permissions are represented as char[]
        mapper.enable(SerializationFeature.WRITE_CHAR_ARRAYS_AS_JSON_ARRAYS);

        // register filter provider
        registerFilterProvider();

        SimpleModule module = new SimpleModule();
        module.setDeserializerModifier(new BeanDeserializerModifier() {
            @Override
            public JsonDeserializer modifyEnumDeserializer(DeserializationConfig config,
                                                                 final JavaType type,
                                                                 BeanDescription beanDesc,
                                                                 final JsonDeserializer deserializer) {
                return new JsonDeserializer() {
                    @Override
                    public Enum deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
                        Class rawClass = (Class>) type.getRawClass();
                        return Enum.valueOf(rawClass, jp.getValueAsString().toUpperCase());
                    }
                };
            }
        });
        module.addSerializer(Enum.class, new StdSerializer(Enum.class) {
            @Override
            public void serialize(Enum value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
                jgen.writeString(value.name().toLowerCase());
            }
        });
        mapper.registerModule(module);
    }

    @Override
    public ObjectMapper getContext(Class type) {
        return mapper;
    }

    private void registerFilterProvider() {
        PropertyFilter apiMembershipTypeFilter = new ApiPermissionFilter();
        mapper.setFilterProvider(new SimpleFilterProvider(Collections.singletonMap("apiMembershipTypeFilter", apiMembershipTypeFilter)));
    }
}