GenericQtClientCore/formats/jsonparser.cpp

#include "jsonparser.h"

#include <QJsonArray>
#include <QJsonObject>

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

QList<ModelItemValues> JsonParser::toItemValuesList(const QByteArray& jsonData,
                                                    const QString& rootValueName) {
  QList<ModelItemValues> result;

  if (jsonData.isEmpty()) {
    return result;
  }
  // TODO tidy up the following code and encapsulate into functions;

  QJsonDocument doc = QJsonDocument::fromJson(jsonData);

  /// case one: json value name in plural -> should contain an array of items
  if (rootValueName == ITEMS_KEY_STRING) {
    QJsonArray itemArray = extractItemArray(doc, rootValueName);

    foreach (QJsonValue value, itemArray) {
      QJsonObject itemJsonObject = value.toObject();
      ModelItemValues values     = jsonObjectToItemValues(itemJsonObject);
      result.append(values);
    }
  }
  /// case two: json value name in singular -> should contain an object of one item
  if (rootValueName == ITEM_KEY_STRING) {
    QJsonObject rootObject     = doc.object();
    QJsonObject itemJsonObject = rootObject.value(rootValueName).toObject();
    ModelItemValues values     = jsonObjectToItemValues(itemJsonObject);
    result.append(values);
  }

  return result;
}

QByteArray JsonParser::itemValuesListToJson(const QList<ModelItemValues>& itemValuesList,
                                            const QString& objectName) {
  QJsonDocument jsonDoc;
  QJsonObject rootObject;
  QJsonArray itemArray;
  for (const ModelItemValues& itemValues : itemValuesList) {
    QJsonObject itemObject = itemValuesToJsonObject(itemValues);
    itemArray.append(itemObject);
  }

  rootObject.insert(objectName, itemArray);
  jsonDoc.setObject(rootObject);

  return jsonDoc.toJson(QJsonDocument::Compact);
}

QJsonObject JsonParser::itemValuesToJsonObject(const ModelItemValues& itemValues) {
  QJsonObject result;

  // TODO add dates (entry, modification, end)
  const UserRoles idRole   = IdRole;
  const QJsonValue idValue = extractJsonValue(itemValues, idRole);
  if (!idValue.isNull()) {
    const QString idRoleName = ROLE_NAMES.value(idRole);
    result.insert(idRoleName, idValue);
  }

  QListIterator<UserRoles> i(USER_FACING_ROLES);
  while (i.hasNext()) {
    const UserRoles role       = i.next();
    const QJsonValue jsonValue = extractJsonValue(itemValues, role);
    const QString roleName     = ROLE_NAMES.value(role);
    result.insert(roleName, jsonValue);
  }
  return result;
}

JsonParser::JsonParser() {}

QJsonArray JsonParser::extractItemArray(const QJsonDocument& doc, const QString& objectName) {
  QJsonArray itemArray;
  if (objectName.isEmpty()) {
    itemArray = doc.array();
  } else {
    QJsonObject rootObject = doc.object();
    itemArray              = rootObject.value(objectName).toArray();
  }
  return itemArray;
}

ModelItemValues JsonParser::jsonObjectToItemValues(const QJsonObject& itemJsonObject) {
  ModelItemValues values;

  const UserRoles idRole   = IdRole;
  const QString idRoleName = ROLE_NAMES.value(idRole);
  // QVariant idValue         = data(idRole);
  if (itemJsonObject.contains(idRoleName)) {
    std::pair<int, QVariant> keyValuePair = getKeyValuePair(itemJsonObject, idRole);
    values.insert(keyValuePair.first, keyValuePair.second);
  }

  for (auto iter = itemJsonObject.constBegin(), end = itemJsonObject.constEnd(); iter != end;
       ++iter) {
    const QString roleName = iter.key();
    if (ROLE_NAMES.values().contains(roleName)) {
      const int role                        = ROLE_NAMES.key(roleName.toLatin1());
      std::pair<int, QVariant> keyValuePair = getKeyValuePair(itemJsonObject, role);
      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 if (TYPE_ROLES.contains(role)) {
    result = jsonValue.toString();
  } else {
    qCritical() << QString("Cant find data type of role %1!!!").arg(role);
  }
  return pair<int, QVariant>(role, result);
}

QJsonValue JsonParser::extractJsonValue(const ModelItemValues& itemValues, const int role) {
  QJsonValue result;
  const QString roleName = ROLE_NAMES.value(role);
  const QVariant value   = itemValues.value(role);
  if (STRING_ROLES.contains(role)) {
    result = value.toString();
  } else if (INT_ROLES.contains(role)) {
    result = value.toInt();
  } else if (DOUBLE_ROLES.contains(role)) {
    result = value.toDouble();
  } else if (TYPE_ROLES.contains(role)) {
    result = value.toString();
  } else {
    qCritical() << QString("Can't find data type for role %1!!!").arg(role);
  }
  return result;
}