#include "servercommunicator.h"
#include "apiroutes.h"

#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QRestReply>

#include "../formats/jsonparser.h"

using namespace Qt::StringLiterals;

ServerCommunicator::ServerCommunicator(QObject* parent)
    : QObject{parent} {
  m_netManager.setAutoDeleteReplies(true);
  m_restManager = std::make_shared<QRestAccessManager>(&m_netManager);
  m_serviceApi  = std::make_shared<QNetworkRequestFactory>();
}

bool ServerCommunicator::sslSupported() {
#if QT_CONFIG(ssl)
  return QSslSocket::supportsSsl();
#else
  return false;
#endif
}

QUrl ServerCommunicator::url() const { return m_serviceApi->baseUrl(); }

void ServerCommunicator::setUrl(const QUrl& url) {
  if (m_serviceApi->baseUrl() == url) {
    return;
  }
  m_serviceApi->setBaseUrl(url);
  QHttpHeaders authenticationHeaders;
  authenticationHeaders.append(QHttpHeaders::WellKnownHeader::ContentType, "application/json");
  m_serviceApi->setCommonHeaders(authenticationHeaders);
  emit urlChanged();
}

void ServerCommunicator::setServerConfiguration(const QString url,
                                                const QString email,
                                                const QString password,
                                                const QString authToken) {
  setUrl(url);

  m_email     = email;
  m_password  = password;
  m_authToken = authToken;

  if (authToken.isEmpty()) {
    if (validLoginCredentials()) {
      const QByteArray userCredentials =
          JsonParser::userCredentialsToJsonDocument(m_email, m_password);
      sendPostRequest(ROUTE_LOG_IN, userCredentials);
    }
  } else {
    /// authToken not empty:
    m_serviceApi->setBearerToken(authToken.toLatin1());
  }
}

void ServerCommunicator::fetchItems() { sendGetRequest(ROUTE_ITEMS); }

void ServerCommunicator::sendItem(const QByteArray& jsonData) {
  sendPostRequest(ROUTE_ITEMS, jsonData);
}

void ServerCommunicator::deleteItem(const QString& id) {
  const QString path = QString("%1/%2").arg(ROUTE_ITEMS, id);
  sendDeleteRequest(path);
}

bool ServerCommunicator::validLoginCredentials() {
  if (url().isEmpty()) {
    return false;
  }
  if (m_email.isEmpty()) {
    return false;
  }
  if (m_password.isEmpty()) {
    return false;
  }
  return true;
}

void ServerCommunicator::sendGetRequest(const QString& path) {
  // TODO check for valid path, instead of emptiness
  if (path.isEmpty()) {
    qDebug() << "Empty path -> Not sending a request.";
    return;
  }

  const QNetworkRequest request = m_serviceApi->createRequest(path);
  m_restManager->get(request, this, [this, path](QRestReply& reply) {
    if (reply.isSuccess()) {
      qInfo() << "Request successful.";
      const QJsonDocument doc = reply.readJson().value();
      onGetReplySuccessful(path, doc);
    } else {
      if (reply.hasError()) {
        const QString errorString = reply.errorString();
        qWarning() << "Network error:" << errorString;
        onGetReplyFailure(path, errorString);
      } else {
        int statusCode = reply.httpStatus();
        qWarning() << "Request not successful:" << statusCode;
        if (statusCode == 401) {
          notAuthorized(path);
        } else {
          onGetReplyFailure(path, QString("HTTP status code: %1").arg(statusCode));
        }
      }
    }
  });
}

void ServerCommunicator::onGetReplySuccessful(const QString& path, const QJsonDocument doc) {
  if (path == ROUTE_ITEMS) {
    emit itemsFetched(doc.toJson());
  } else {
    qWarning() << "Can't match request path:" << path;
  }
}

void ServerCommunicator::onGetReplyFailure(const QString& path, const QString errorString) {
  if (path == ROUTE_ITEMS) {
    emit itemsFetchFailure(errorString);
  } else {
    qWarning() << "Can't match request path:" << path;
  }
}

void ServerCommunicator::sendPostRequest(const QString& path, const QByteArray data) {
  const QNetworkRequest request = m_serviceApi->createRequest(path);

  m_restManager->post(request, data, this, [this, path](QRestReply& reply) {
    if (reply.isSuccess()) {
      int statusCode = reply.httpStatus();
      qInfo() << "Request successful. Status code:" << statusCode;
      const QJsonDocument doc = reply.readJson().value();
      onPostReplySuccessful(path, doc);
    } else {
      if (reply.hasError()) {
        const QString errorString = reply.errorString();
        qWarning() << "Network error:" << errorString;
        onPostReplyFailure(path, errorString);
      } else {
        int statusCode = reply.httpStatus();
        qWarning() << "Request not successful:" << statusCode;
        qInfo() << "Content:" << reply.readJson();
        if (statusCode == 401) {
          notAuthorized(path);
        } else {
          onPostReplyFailure(path, QString("HTTP status code: %1").arg(statusCode));
        }
      }
    }
  });
}

void ServerCommunicator::onPostReplySuccessful(const QString& path, const QJsonDocument doc) {
  if (path == ROUTE_ITEMS) {
    emit sendItemSuccessful(doc.toJson());
  } else if (path == ROUTE_LOG_IN) {
    qCritical() << "Login success:" << doc.toJson(QJsonDocument::Compact);
    emit loginSuccessful(doc.toJson(QJsonDocument::Compact));
  } else {
    qWarning() << "Can't match request path:" << path;
  }
}

void ServerCommunicator::onPostReplyFailure(const QString& path, const QString errorString) {
  if (path == ROUTE_ITEMS) {
    emit sendItemFailure(errorString);
  } else if (path == ROUTE_LOG_IN) {
    qCritical() << "Login failure:" << errorString;
    emit loginFailure(errorString);
  } else {
    qWarning() << "Can't match request path:" << path;
  }
}

void ServerCommunicator::sendDeleteRequest(const QString& path) {
  const QNetworkRequest request = m_serviceApi->createRequest(path);
  m_restManager->deleteResource(request, this, [this, path](QRestReply& reply) {
    if (reply.isSuccess()) {
      qInfo() << "Request successful.";
      const QJsonDocument doc = reply.readJson().value();
      onDeleteReplySuccessful(path, doc);
    } else {
      if (reply.hasError()) {
        const QString errorString = reply.errorString();
        qWarning() << "Network error:" << errorString;
        onDeleteReplyFailure(path, errorString);
      } else {
        int statusCode = reply.httpStatus();
        qWarning() << "Request not successful:" << statusCode;
        if (statusCode == 401) {
          notAuthorized(path);
        } else {
          onDeleteReplyFailure(path, QString("HTTP status code: %1").arg(statusCode));
        }
      }
    }
  });
}

void ServerCommunicator::onDeleteReplySuccessful(const QString& path, const QJsonDocument doc) {
  if (path.startsWith(ROUTE_ITEMS)) {
    emit deleteItemSuccessful(doc.toJson());
  } else {
    qWarning() << "Can't match request path:" << path;
  }
}

void ServerCommunicator::onDeleteReplyFailure(const QString& path, const QString errorString) {
  if (path.startsWith(ROUTE_ITEMS)) {
    emit deleteItemFailure(errorString);
  } else {
    qWarning() << "Can't match request path:" << path;
  }
}