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/*
 * Copyright (C) 2016 Leonard Osang
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package pep1.commons.jpa.jackson;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.PageRequest;
import pep1.commons.domain.dto.MetaDataDTO;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * Created on 9/2/15.
 */
@Slf4j
public class PageDeserializer extends JsonDeserializer {

    @Override
    public Page deserialize(final JsonParser jsonParser, final DeserializationContext ctxt) throws IOException {
        ObjectCodec oc = jsonParser.getCodec();
        JsonNode node = oc.readTree(jsonParser);

        JsonNode metaDataNode = node.get("meta");
        MetaDataDTO metaDataDTO;
        Class contentClass = Object.class;
        PageRequest request = null;
        Long totalItems = null;

        if (null != metaDataNode) {
            metaDataDTO = oc.readValue(metaDataNode.traverse(), MetaDataDTO.class);
            if (null != metaDataDTO) {
                contentClass = guessClassByName(metaDataDTO.getContentType());
                request = new PageRequest(metaDataDTO.getPage(), metaDataDTO.getPerPage());
                totalItems = metaDataDTO.getTotalItems();
            }
        }

        JsonNode contentNode = node.get("content");
        List