// This file is part of RSS Guard.
//
// Copyright (C) 2011-2016 by Martin Rotter <rotter.martinos@gmail.com>
//
// RSS Guard is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// RSS Guard is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with RSS Guard. If not, see <http://www.gnu.org/licenses/>.

#include "services/tt-rss/network/ttrssnetworkfactory.h"

#include "definitions/definitions.h"
#include "services/abstract/rootitem.h"
#include "services/tt-rss/definitions.h"
#include "services/tt-rss/ttrssfeed.h"
#include "services/tt-rss/ttrsscategory.h"
#include "miscellaneous/application.h"
#include "miscellaneous/iconfactory.h"
#include "miscellaneous/textfactory.h"
#include "network-web/networkfactory.h"

#include <QJsonDocument>
#include <QJsonArray>
#include <QPair>
#include <QVariant>


TtRssNetworkFactory::TtRssNetworkFactory()
  : m_url(QString()), m_username(QString()), m_password(QString()), m_forceServerSideUpdate(false), m_authIsUsed(false),
    m_authUsername(QString()), m_authPassword(QString()), m_sessionId(QString()),
    m_lastLoginTime(QDateTime()), m_lastError(QNetworkReply::NoError) {
}

TtRssNetworkFactory::~TtRssNetworkFactory() {
}

QString TtRssNetworkFactory::url() const {
  return m_url;
}

void TtRssNetworkFactory::setUrl(const QString &url) {
  m_url = url;
}

QString TtRssNetworkFactory::username() const {
  return m_username;
}

void TtRssNetworkFactory::setUsername(const QString &username) {
  m_username = username;
}

QString TtRssNetworkFactory::password() const {
  return m_password;
}

void TtRssNetworkFactory::setPassword(const QString &password) {
  m_password = password;
}

QDateTime TtRssNetworkFactory::lastLoginTime() const {
  return m_lastLoginTime;
}

QNetworkReply::NetworkError TtRssNetworkFactory::lastError() const {
  return m_lastError;
}

TtRssLoginResponse TtRssNetworkFactory::login() {
  if (!m_sessionId.isEmpty()) {
    qDebug("TT-RSS: Session ID is not empty before login, logging out first.");

    logout();
  }

  QJsonObject json;
  json["op"] = "login";
  json["user"] = m_username;
  json["password"] = m_password;

  QByteArray result_raw;
  NetworkResult network_reply = NetworkFactory::performNetworkOperation(m_url, qApp->settings()->value(GROUP(Feeds),
                                                                                          SETTING(Feeds::UpdateTimeout)).toInt(),
                                                           QJsonDocument(json).toJson(QJsonDocument::Compact), CONTENT_TYPE, result_raw,
                                                           QNetworkAccessManager::PostOperation,
                                                           m_authIsUsed, m_authUsername, m_authPassword);
  TtRssLoginResponse login_response(QString::fromUtf8(result_raw));

  if (network_reply.first == QNetworkReply::NoError) {
    m_sessionId = login_response.sessionId();
    m_lastLoginTime = QDateTime::currentDateTime();
  }
  else {
    qWarning("TT-RSS: Login failed with error %d.", network_reply.first);
  }

  m_lastError = network_reply.first;
  return login_response;
}

TtRssResponse TtRssNetworkFactory::logout() {
  if (!m_sessionId.isEmpty()) {

    QJsonObject json;
    json["op"] = "logout";
    json["sid"] = m_sessionId;

    QByteArray result_raw;
    NetworkResult network_reply = NetworkFactory::performNetworkOperation(m_url, qApp->settings()->value(GROUP(Feeds),
                                                                                            SETTING(Feeds::UpdateTimeout)).toInt(),
                                                             QJsonDocument(json).toJson(QJsonDocument::Compact), CONTENT_TYPE, result_raw,
                                                             QNetworkAccessManager::PostOperation,
                                                             m_authIsUsed, m_authUsername, m_authPassword);

    m_lastError = network_reply.first;

    if (m_lastError == QNetworkReply::NoError) {
      m_sessionId.clear();
    }
    else {
      qWarning("TT-RSS: Logout failed with error %d.", network_reply.first);
    }

    return TtRssResponse(QString::fromUtf8(result_raw));
  }
  else {
    qWarning("TT-RSS: Cannot logout because session ID is empty.");

    m_lastError = QNetworkReply::NoError;
    return TtRssResponse();
  }
}

TtRssGetFeedsCategoriesResponse TtRssNetworkFactory::getFeedsCategories() {
  QJsonObject json;
  json["op"] = "getFeedTree";
  json["sid"] = m_sessionId;
  json["include_empty"] = true;

  const int timeout = qApp->settings()->value(GROUP(Feeds), SETTING(Feeds::UpdateTimeout)).toInt();
  QByteArray result_raw;
  NetworkResult network_reply = NetworkFactory::performNetworkOperation(m_url, timeout, QJsonDocument(json).toJson(QJsonDocument::Compact),
                                                           CONTENT_TYPE, result_raw,
                                                           QNetworkAccessManager::PostOperation,
                                                           m_authIsUsed, m_authUsername, m_authPassword);
  TtRssGetFeedsCategoriesResponse result(QString::fromUtf8(result_raw));

  if (result.isNotLoggedIn()) {
    // We are not logged in.
    login();
    json["sid"] = m_sessionId;

    network_reply = NetworkFactory::performNetworkOperation(m_url, timeout, QJsonDocument(json).toJson(QJsonDocument::Compact), CONTENT_TYPE, result_raw,
                                               QNetworkAccessManager::PostOperation,
                                               m_authIsUsed, m_authUsername, m_authPassword);
    result = TtRssGetFeedsCategoriesResponse(QString::fromUtf8(result_raw));
  }

  if (network_reply.first != QNetworkReply::NoError) {
    qWarning("TT-RSS: getFeedTree failed with error %d.", network_reply.first);
  }

  m_lastError = network_reply.first;
  return result;
}

TtRssGetHeadlinesResponse TtRssNetworkFactory::getHeadlines(int feed_id, int limit, int skip,
                                                            bool show_content, bool include_attachments,
                                                            bool sanitize) {
  QJsonObject json;
  json["op"] = "getHeadlines";
  json["sid"] = m_sessionId;
  json["feed_id"] = feed_id;
  json["force_update"] = m_forceServerSideUpdate;
  json["limit"] = limit;
  json["skip"] = skip;
  json["show_content"] = show_content;
  json["include_attachments"] = include_attachments;
  json["sanitize"] = sanitize;

  const int timeout = qApp->settings()->value(GROUP(Feeds), SETTING(Feeds::UpdateTimeout)).toInt();
  QByteArray result_raw;
  NetworkResult network_reply = NetworkFactory::performNetworkOperation(m_url, timeout, QJsonDocument(json).toJson(QJsonDocument::Compact),
                                                           CONTENT_TYPE, result_raw,
                                                           QNetworkAccessManager::PostOperation,
                                                           m_authIsUsed, m_authUsername, m_authPassword);
  TtRssGetHeadlinesResponse result(QString::fromUtf8(result_raw));

  if (result.isNotLoggedIn()) {
    // We are not logged in.
    login();
    json["sid"] = m_sessionId;

    network_reply = NetworkFactory::performNetworkOperation(m_url, timeout, QJsonDocument(json).toJson(QJsonDocument::Compact), CONTENT_TYPE, result_raw,
                                               QNetworkAccessManager::PostOperation,
                                               m_authIsUsed, m_authUsername, m_authPassword);
    result = TtRssGetHeadlinesResponse(QString::fromUtf8(result_raw));
  }

  if (network_reply.first != QNetworkReply::NoError) {
    qWarning("TT-RSS: getHeadlines failed with error %d.", network_reply.first);
  }

  m_lastError = network_reply.first;
  return result;
}

TtRssUpdateArticleResponse TtRssNetworkFactory::updateArticles(const QStringList &ids,
                                                               UpdateArticle::OperatingField field,
                                                               UpdateArticle::Mode mode) {
  QJsonObject json;
  json["op"] = "updateArticle";
  json["sid"] = m_sessionId;
  json["article_ids"] = ids.join(QSL(","));
  json["mode"] = (int) mode;
  json["field"] = (int) field;

  const int timeout = qApp->settings()->value(GROUP(Feeds), SETTING(Feeds::UpdateTimeout)).toInt();
  QByteArray result_raw;
  NetworkResult network_reply = NetworkFactory::performNetworkOperation(m_url, timeout, QJsonDocument(json).toJson(QJsonDocument::Compact),
                                                           CONTENT_TYPE, result_raw,
                                                           QNetworkAccessManager::PostOperation,
                                                           m_authIsUsed, m_authUsername, m_authPassword);
  TtRssUpdateArticleResponse result(QString::fromUtf8(result_raw));

  if (result.isNotLoggedIn()) {
    // We are not logged in.
    login();
    json["sid"] = m_sessionId;

    network_reply = NetworkFactory::performNetworkOperation(m_url, timeout, QJsonDocument(json).toJson(QJsonDocument::Compact),
                                               CONTENT_TYPE, result_raw,
                                               QNetworkAccessManager::PostOperation,
                                               m_authIsUsed, m_authUsername, m_authPassword);
    result = TtRssUpdateArticleResponse(QString::fromUtf8(result_raw));
  }

  if (network_reply.first != QNetworkReply::NoError) {
    qWarning("TT-RSS: updateArticle failed with error %d.", network_reply.first);
  }

  m_lastError = network_reply.first;
  return result;
}

TtRssSubscribeToFeedResponse TtRssNetworkFactory::subscribeToFeed(const QString &url, int category_id,
                                                                  bool protectd, const QString &username,
                                                                  const QString &password) {
  QJsonObject json;
  json["op"] = "subscribeToFeed";
  json["sid"] = m_sessionId;
  json["feed_url"] = url;
  json["category_id"] = category_id;

  if (protectd) {
    json["login"] = username;
    json["password"] = password;
  }

  const int timeout = qApp->settings()->value(GROUP(Feeds), SETTING(Feeds::UpdateTimeout)).toInt();
  QByteArray result_raw;
  NetworkResult network_reply = NetworkFactory::performNetworkOperation(m_url, timeout, QJsonDocument(json).toJson(QJsonDocument::Compact),
                                                           CONTENT_TYPE, result_raw,
                                                           QNetworkAccessManager::PostOperation,
                                                           m_authIsUsed, m_authUsername, m_authPassword);
  TtRssSubscribeToFeedResponse result(QString::fromUtf8(result_raw));

  if (result.isNotLoggedIn()) {
    // We are not logged in.
    login();
    json["sid"] = m_sessionId;

    network_reply = NetworkFactory::performNetworkOperation(m_url, timeout, QJsonDocument(json).toJson(QJsonDocument::Compact),
                                               CONTENT_TYPE, result_raw,
                                               QNetworkAccessManager::PostOperation,
                                               m_authIsUsed, m_authUsername, m_authPassword);
    result = TtRssSubscribeToFeedResponse(QString::fromUtf8(result_raw));
  }

  if (network_reply.first != QNetworkReply::NoError) {
    qWarning("TT-RSS: updateArticle failed with error %d.", network_reply.first);
  }

  m_lastError = network_reply.first;
  return result;
}

TtRssUnsubscribeFeedResponse TtRssNetworkFactory::unsubscribeFeed(int feed_id) {
  QJsonObject json;
  json["op"] = "unsubscribeFeed";
  json["sid"] = m_sessionId;
  json["feed_id"] = feed_id;

  const int timeout = qApp->settings()->value(GROUP(Feeds), SETTING(Feeds::UpdateTimeout)).toInt();
  QByteArray result_raw;
  NetworkResult network_reply = NetworkFactory::performNetworkOperation(m_url, timeout, QJsonDocument(json).toJson(QJsonDocument::Compact), CONTENT_TYPE, result_raw,
                                                           QNetworkAccessManager::PostOperation,
                                                           m_authIsUsed, m_authUsername, m_authPassword);
  TtRssUnsubscribeFeedResponse result(QString::fromUtf8(result_raw));

  if (result.isNotLoggedIn()) {
    // We are not logged in.
    login();
    json["sid"] = m_sessionId;

    network_reply = NetworkFactory::performNetworkOperation(m_url, timeout, QJsonDocument(json).toJson(QJsonDocument::Compact), CONTENT_TYPE, result_raw,
                                               QNetworkAccessManager::PostOperation,
                                               m_authIsUsed, m_authUsername, m_authPassword);
    result = TtRssUnsubscribeFeedResponse(QString::fromUtf8(result_raw));
  }

  if (network_reply.first != QNetworkReply::NoError) {
    qWarning("TT-RSS: getFeeds failed with error %d.", network_reply.first);
  }

  m_lastError = network_reply.first;
  return result;
}

bool TtRssNetworkFactory::forceServerSideUpdate() const {
  return m_forceServerSideUpdate;
}

void TtRssNetworkFactory::setForceServerSideUpdate(bool force_server_side_update) {
  m_forceServerSideUpdate = force_server_side_update;
}

bool TtRssNetworkFactory::authIsUsed() const {
  return m_authIsUsed;
}

void TtRssNetworkFactory::setAuthIsUsed(bool auth_is_used) {
  m_authIsUsed = auth_is_used;
}

QString TtRssNetworkFactory::authUsername() const {
  return m_authUsername;
}

void TtRssNetworkFactory::setAuthUsername(const QString &auth_username) {
  m_authUsername = auth_username;
}

QString TtRssNetworkFactory::authPassword() const {
  return m_authPassword;
}

void TtRssNetworkFactory::setAuthPassword(const QString &auth_password) {
  m_authPassword = auth_password;
}

TtRssResponse::TtRssResponse(const QString &raw_content) {
  m_rawContent = QJsonDocument::fromJson(raw_content.toUtf8()).object();
}

TtRssResponse::~TtRssResponse() {
}

bool TtRssResponse::isLoaded() const {
  return !m_rawContent.isEmpty();
}

int TtRssResponse::seq() const {
  if (!isLoaded()) {
    return CONTENT_NOT_LOADED;
  }
  else {
    return m_rawContent["seq"].toInt();
  }
}

int TtRssResponse::status() const {
  if (!isLoaded()) {
    return CONTENT_NOT_LOADED;
  }
  else {
    return m_rawContent["status"].toInt();
  }
}

bool TtRssResponse::isNotLoggedIn() const {
  return status() == API_STATUS_ERR && hasError() && error() == NOT_LOGGED_IN;
}

QString TtRssResponse::toString() const {
  return QJsonDocument(m_rawContent).toJson(QJsonDocument::Compact);
}

TtRssLoginResponse::TtRssLoginResponse(const QString &raw_content) : TtRssResponse(raw_content) {
}

TtRssLoginResponse::~TtRssLoginResponse() {
}

int TtRssLoginResponse::apiLevel() const {
  if (!isLoaded()) {
    return CONTENT_NOT_LOADED;
  }
  else {
    return m_rawContent["content"].toObject()["api_level"].toInt();
  }
}

QString TtRssLoginResponse::sessionId() const {
  if (!isLoaded()) {
    return QString();
  }
  else {
    return m_rawContent["content"].toObject()["session_id"].toString();
  }
}

QString TtRssResponse::error() const {
  if (!isLoaded()) {
    return QString();
  }
  else {
    return m_rawContent["content"].toObject()["error"].toString();
  }
}

bool TtRssResponse::hasError() const {
  if (!isLoaded()) {
    return false;
  }
  else {
    return m_rawContent["content"].toObject().contains("error");
  }
}


TtRssGetFeedsCategoriesResponse::TtRssGetFeedsCategoriesResponse(const QString &raw_content) : TtRssResponse(raw_content) {

}

TtRssGetFeedsCategoriesResponse::~TtRssGetFeedsCategoriesResponse() {
}

RootItem *TtRssGetFeedsCategoriesResponse::feedsCategories(bool obtain_icons, QString base_address) const {
  RootItem *parent = new RootItem();

  // Chop the "api/" from the end of the address.
  base_address.chop(4);

  qDebug("TT-RSS: Chopped base address to '%s' to get feed icons.", qPrintable(base_address));

  if (status() == API_STATUS_OK) {
    // We have data, construct object tree according to data.
    QJsonArray items_to_process = m_rawContent["content"].toObject()["categories"].toObject()["items"].toArray();
    QList<QPair<RootItem*,QJsonValue> > pairs;

    foreach (QJsonValue item, items_to_process) {
      pairs.append(QPair<RootItem*,QJsonValue>(parent, item));
    }

    while (!pairs.isEmpty()) {
      QPair<RootItem*,QJsonValue> pair = pairs.takeFirst();
      RootItem *act_parent = pair.first;
      QJsonObject item = pair.second.toObject();

      int item_id = item["bare_id"].toInt();
      bool is_category = item.contains("type") && item["type"].toString() == GFT_TYPE_CATEGORY;

      if (item_id >= 0) {
        if (is_category) {
          if (item_id == 0) {
            // This is "Uncategorized" category, all its feeds belong to top-level root.
            if (item.contains("items")) {
              foreach (QJsonValue child_feed, item["items"].toArray()) {
                pairs.append(QPair<RootItem*,QJsonValue>(parent, child_feed));
              }
            }
          }
          else {
            TtRssCategory *category = new TtRssCategory();

            category->setTitle(item["name"].toString());
            category->setCustomId(item_id);
            act_parent->appendChild(category);

            if (item.contains("items")) {
              foreach (QJsonValue child, item["items"].toArray()) {
                pairs.append(QPair<RootItem*,QJsonValue>(category, child));
              }
            }
          }
        }
        else {
          // We have feed.
          TtRssFeed *feed = new TtRssFeed();

          if (obtain_icons) {
            QString icon_path = item["icon"].type() == QJsonValue::String ? item["icon"].toString() : QString();

            if (!icon_path.isEmpty()) {
              // Chop the "api/" suffix out and append
              QString full_icon_address = base_address + QL1C('/') + icon_path;
              QByteArray icon_data;

              if (NetworkFactory::performNetworkOperation(full_icon_address, DOWNLOAD_TIMEOUT,
                                                          QByteArray(), QString(), icon_data,
                                                          QNetworkAccessManager::GetOperation).first == QNetworkReply::NoError) {
                // Icon downloaded, set it up.
                QPixmap icon_pixmap;
                icon_pixmap.loadFromData(icon_data);
                feed->setIcon(QIcon(icon_pixmap));
              }
            }
          }

          feed->setTitle(item["name"].toString());
          feed->setCustomId(item_id);
          act_parent->appendChild(feed);
        }
      }
    }
  }

  return parent;
}


TtRssGetHeadlinesResponse::TtRssGetHeadlinesResponse(const QString &raw_content) : TtRssResponse(raw_content) {
}

TtRssGetHeadlinesResponse::~TtRssGetHeadlinesResponse() {
}

QList<Message> TtRssGetHeadlinesResponse::messages() const {
  QList<Message> messages;

  foreach (QJsonValue item, m_rawContent["content"].toArray()) {
    QJsonObject mapped = item.toObject();
    Message message;

    message.m_author = mapped["author"].toString();
    message.m_isRead = !mapped["unread"].toBool();
    message.m_isImportant = mapped["marked"].toBool();
    message.m_contents = mapped["content"].toString();

    // Multiply by 1000 because Tiny Tiny RSS API does not include miliseconds in Unix
    // date/time number.
    message.m_created = TextFactory::parseDateTime(mapped["updated"].toVariant().value<qint64>() * 1000);
    message.m_createdFromFeed = true;
    message.m_customId = mapped["id"].toString();
    message.m_feedId = mapped["feed_id"].toString();
    message.m_title = mapped["title"].toString();
    message.m_url = mapped["link"].toString();

    if (mapped.contains(QSL("attachments"))) {
      // Process enclosures.
      foreach (QJsonValue attachment, mapped["attachments"].toArray()) {
        QJsonObject mapped_attachemnt = attachment.toObject();
        Enclosure enclosure;

        enclosure.m_mimeType = mapped_attachemnt["content_type"].toString();
        enclosure.m_url = mapped_attachemnt["content_url"].toString();
        message.m_enclosures.append(enclosure);
      }
    }

    messages.append(message);
  }

  return messages;
}


TtRssUpdateArticleResponse::TtRssUpdateArticleResponse(const QString &raw_content) : TtRssResponse(raw_content) {
}

TtRssUpdateArticleResponse::~TtRssUpdateArticleResponse() {
}

QString TtRssUpdateArticleResponse::updateStatus() const {
  if (m_rawContent.contains(QSL("content"))) {
    return m_rawContent["content"].toObject()["status"].toString();
  }
  else {
    return QString();
  }
}

int TtRssUpdateArticleResponse::articlesUpdated() const {
  if (m_rawContent.contains(QSL("content"))) {
    return m_rawContent["content"].toObject()["updated"].toInt();
  }
  else {
    return 0;
  }
}

TtRssSubscribeToFeedResponse::TtRssSubscribeToFeedResponse(const QString &raw_content) : TtRssResponse(raw_content) {
}

TtRssSubscribeToFeedResponse::~TtRssSubscribeToFeedResponse() {
}

int TtRssSubscribeToFeedResponse::code() const {
  if (m_rawContent.contains(QSL("content"))) {
    return m_rawContent["content"].toObject()["status"].toObject()["code"].toInt();
  }
  else {
    return STF_UNKNOWN;
  }
}


TtRssUnsubscribeFeedResponse::TtRssUnsubscribeFeedResponse(const QString &raw_content) : TtRssResponse(raw_content) {
}

TtRssUnsubscribeFeedResponse::~TtRssUnsubscribeFeedResponse() {
}

QString TtRssUnsubscribeFeedResponse::code() const {
  if (m_rawContent.contains(QSL("content"))) {
    QJsonObject map = m_rawContent["content"].toObject();

    if (map.contains(QSL("error"))) {
      return map["error"].toString();
    }
    else if (map.contains(QSL("status"))) {
      return map["status"].toString();
    }
  }

  return QString();
}