#include "jsonparser.h"

#include <QJsonArray>
#include <QJsonObject>

#include "../model/metadata.h"

QList<QHash<int, QVariant>> JsonParser::toItemValuesList(const QByteArray& jsonData,
                                                         const QString& objectName) {
  QList<QHash<int, QVariant>> result;

  if (jsonData.isEmpty()) {
    return result;
  }

  QJsonArray itemArray = extractItemArray(jsonData, objectName);

  foreach (QJsonValue value, itemArray) {
    QJsonObject itemJsonObject  = value.toObject();
    QHash<int, QVariant> values = jsonObjectToItemValues(itemJsonObject);
    result.append(values);
  }
  return result;
}

JsonParser::JsonParser() {}

QJsonArray JsonParser::extractItemArray(const QByteArray& jsonData, const QString& objectName) {
  QJsonDocument doc = QJsonDocument::fromJson(jsonData);
  QJsonArray itemArray;
  if (objectName.isEmpty()) {
    itemArray = doc.array();

  } else {
    QJsonObject rootObject = doc.object();
    itemArray              = rootObject.value(objectName).toArray();
  }

  return itemArray;
}

QHash<int, QVariant> JsonParser::jsonObjectToItemValues(const QJsonObject& itemJsonObject) {
  QHash<int, QVariant> values;

  for (auto iter = ROLE_NAMES.cbegin(), end = ROLE_NAMES.cend(); iter != end; ++iter) {
    std::pair<int, QVariant> keyValuePair = getKeyValuePair(itemJsonObject, iter.key());
    values.insert(keyValuePair.first, keyValuePair.second);
  }
  return values;
}

pair<int, QVariant> JsonParser::getKeyValuePair(const QJsonObject& itemJsonObject, const int role) {
  QVariant result;
  const QJsonValue jsonValue = itemJsonObject[ROLE_NAMES.value(role)];
  if (STRING_ROLES.contains(role)) {
    result = jsonValue.toString();
  } else if (INT_ROLES.contains(role)) {
    result = jsonValue.toInt();
  } else if (DOUBLE_ROLES.contains(role)) {
    result = jsonValue.toDouble();
  } else {
    qCritical() << QString("Cant find data type of role %1!!!").arg(role);
  }
  return pair<int, QVariant>(role, result.toString());
}