#include "jsonparser.h"

#include <QJsonArray>
#include <QJsonObject>

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

    QListIterator<UserRoles> i(USER_FACING_ROLES);
    while (i.hasNext()) {
      const UserRoles role   = i.next();
      const QString roleName = ROLE_NAMES.value(role);
      const QVariant value   = itemValues.value(role);
      if (STRING_ROLES.contains(role)) {
        itemObject.insert(roleName, value.toString());
      } else if (INT_ROLES.contains(role)) {
        itemObject.insert(roleName, value.toInt());
      } else if (DOUBLE_ROLES.contains(role)) {
        itemObject.insert(roleName, value.toDouble());
      } else {
        qCritical() << QString("Can't find data type for role %1!!!").arg(role);
      }
    }

    itemArray.append(itemObject);
  }

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

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

QByteArray JsonParser::ToJsonObject(const QHash<QString, QVariant>& values,
                                    const QString& objectName) {
  QJsonDocument jsonDoc;
  QJsonObject rootObject;
  QJsonObject itemObject;

  QHashIterator<QString, QVariant> i(values);
  while (i.hasNext()) {
    i.next();
    const QString key    = i.key();
    const QVariant value = i.value();
    itemObject.insert(key, value.toString());
  }

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

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

ModelItemValues JsonParser::serverUserCredentialsToItemValues(const QJsonDocument& jsonDoc) {
  ModelItemValues values;

  const QJsonObject rootObject = jsonDoc["data"].toObject();

  const QString emailAddress = rootObject["email"].toString();
  const QString uuid         = rootObject["id"].toString();
  const QString token        = rootObject["token"].toString();

  values.insert(MailRole, emailAddress);
  values.insert(OnlineIdRole, uuid);
  values.insert(AccessCodeRole, token);

  return values;
}

QList<bidding> JsonParser::extractBiddings(const QJsonDocument& jsonDoc) {
  QList<bidding> result;

  if (jsonDoc.isEmpty()) {
    return result;
  }
  QJsonArray itemArray = JsonParser::extractItemArray(jsonDoc, "data");

  foreach (QJsonValue value, itemArray) {
    // REFACTOR implement & use "JsonParser::parseServerResponse(const QJsonObject& object,
    //          QHash<QString, int> entries)"
    QJsonObject itemJsonObject = value.toObject();
    bidding values{.userId       = itemJsonObject.value("user_id").toString(),
                   .biddingRound = itemJsonObject.value("bidding_round").toInt(),
                   .amount       = itemJsonObject.value("amount").toInt(),
                   .depotWishOne = itemJsonObject.value("depot_wish_one").toString(),
                   .depotWishTwo = itemJsonObject.value("depot_wish_two").toString()};
    result.append(values);
  }

  return result;
}

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;

  QListIterator<UserRoles> i(USER_FACING_ROLES);
  while (i.hasNext()) {
    const UserRoles role                  = i.next();
    std::pair<int, QVariant> keyValuePair = getKeyValuePair(itemJsonObject, role);
    values.insert(keyValuePair.first, keyValuePair.second);
  }
  return values;
}

JsonParser::JsonParser() {}

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);
}