package cn.binarywang.wx.miniapp.util.json;

import cn.binarywang.wx.miniapp.bean.analysis.WxMaRetainInfo;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import me.chanjar.weixin.common.util.json.GsonHelper;

import java.lang.reflect.Type;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * @author <a href="https://github.com/charmingoh">Charming</a>
 * @since 2018-04-28
 */
public class WxMaRetainInfoGsonAdapter implements JsonDeserializer<WxMaRetainInfo> {
  @Override
  public WxMaRetainInfo deserialize(JsonElement json, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
    if (json == null) {
      return null;
    }

    WxMaRetainInfo retainInfo = new WxMaRetainInfo();
    JsonObject object = json.getAsJsonObject();
    String refDate = GsonHelper.getString(object, "ref_date");
    retainInfo.setRefDate(refDate);
    retainInfo.setVisitUvNew(getAsMap(object, "visit_uv_new"));
    retainInfo.setVisitUv(getAsMap(object, "visit_uv"));
    return retainInfo;
  }

  private Map<Integer, Integer> getAsMap(JsonObject object, String memberName) {
    JsonArray array = object.getAsJsonArray(memberName);
    if (array != null && array.size() > 0) {
      Map<Integer, Integer> map = new LinkedHashMap<>(array.size());
      for (JsonElement element : array) {
        JsonObject elementObject = element.getAsJsonObject();
        Integer key = GsonHelper.getInteger(elementObject, "key");
        if (key != null) {
          Integer value = GsonHelper.getInteger(elementObject, "value");
          map.put(key, value);
        }
      }
      return map;
    }
    return null;
  }
}
