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/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you 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 co.elastic.clients.json.jackson;

import co.elastic.clients.json.BufferingJsonGenerator;
import co.elastic.clients.json.BufferingJsonpMapper;
import co.elastic.clients.json.JsonpDeserializer;
import co.elastic.clients.json.JsonpDeserializerBase;
import co.elastic.clients.json.JsonpMapper;
import co.elastic.clients.json.JsonpMapperBase;
import co.elastic.clients.json.JsonpSerializer;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import jakarta.json.spi.JsonProvider;
import jakarta.json.stream.JsonGenerator;
import jakarta.json.stream.JsonParser;

import java.io.IOException;
import java.lang.reflect.Type;
import java.util.EnumSet;

public class JacksonJsonpMapper extends JsonpMapperBase implements BufferingJsonpMapper {

    private final JacksonJsonProvider provider;
    private final ObjectMapper objectMapper;

    private JacksonJsonpMapper(ObjectMapper objectMapper, JacksonJsonProvider provider) {
        // No need to configure here, as this constructor is only called with the objectMapper
        // of an existing JacksonJsonpMapper, and has therefore alredy been configured.
        this.objectMapper = objectMapper;
        this.provider = provider;
    }

    public JacksonJsonpMapper(ObjectMapper objectMapper) {
        this.objectMapper = configure(objectMapper);
        // Order is important as JacksonJsonProvider(this) will get ObjectMapper
        this.provider = new JacksonJsonProvider(this);
    }

    public JacksonJsonpMapper() {
        this(new ObjectMapper()
            .configure(SerializationFeature.INDENT_OUTPUT, false)
            .setSerializationInclusion(JsonInclude.Include.NON_NULL)
        );
    }

    private static ObjectMapper configure(ObjectMapper objectMapper) {
        // Accept single objects as collections. This is useful in the context of Elasticsearch since
        // Lucene has no concept of multivalued field and fields with a single value will be returned
        // as a single object even if other instances of the same field have multiple values.
        return objectMapper.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);
    }

    @Override
    public  JsonpMapper withAttribute(String name, T value) {
        return new JacksonJsonpMapper(this.objectMapper, this.provider).addAttribute(name, value);
    }

    /**
     * Returns the underlying Jackson mapper.
     */
    public ObjectMapper objectMapper() {
        return this.objectMapper;
    }

    @Override
    public JsonProvider jsonProvider() {
        return provider;
    }

    @Override
    protected   JsonpDeserializer getDefaultDeserializer(Type type) {
        return new JacksonValueParser<>(type);
    }

    @Override
    public  void serialize(T value, JsonGenerator generator) {

        if (!(generator instanceof JacksonJsonpGenerator)) {
            throw new IllegalArgumentException("Jackson's ObjectMapper can only be used with the JacksonJsonpProvider");
        }

        JsonpSerializer serializer = findSerializer(value);
        if (serializer != null) {
            serializer.serialize(value, generator, this);
            return;
        }

        com.fasterxml.jackson.core.JsonGenerator jkGenerator = ((JacksonJsonpGenerator)generator).jacksonGenerator();
        try {
            objectMapper.writeValue(jkGenerator, value);
        } catch (IOException ioe) {
            throw JacksonUtils.convertException(ioe);
        }
    }

    @Override
    public BufferingJsonGenerator createBufferingGenerator() {
        return new JacksonJsonpGenerator.Buffering(this);
    }

    private class JacksonValueParser extends JsonpDeserializerBase {

        private final Type type;

        protected JacksonValueParser(Type type) {
            super(EnumSet.allOf(JsonParser.Event.class));
            this.type = type;
        }

        @Override
        public T deserialize(JsonParser parser, JsonpMapper mapper, JsonParser.Event event) {

            if (!(parser instanceof JacksonJsonpParser)) {
                throw new IllegalArgumentException("Jackson's ObjectMapper can only be used with the JacksonJsonpProvider");
            }

            com.fasterxml.jackson.core.JsonParser jkParser = ((JacksonJsonpParser)parser).jacksonParser();

            try {
                return objectMapper.readValue(jkParser, objectMapper().constructType(type));
            } catch(IOException ioe) {
                throw JacksonUtils.convertException(ioe);
            }
        }
    }
}