/*
 * Squawk messenger. 
 * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
 * 
 * This program 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.
 * 
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include <QObject>
#include <QFileInfo>

#include <deque>
#include <map>
#include <functional>
#include <optional>

#include <QXmppMessage.h>
#include <QXmppHttpUploadIq.h>
#ifdef WITH_OMEMO
    #include <QXmppE2eeExtension.h>
#endif

#include <shared/message.h>
#include <shared/messageinfo.h>
#include <shared/pathcheck.h>

namespace Core {
class Account;

class MessageHandler : public QObject {
    Q_OBJECT
public:
    MessageHandler(Account* account);
    
public:
    void sendMessage(const Shared::Message& data, bool newMessage = true, QString originalId = "");
    void initializeMessage(Shared::Message& target, const QXmppMessage& source, bool outgoing = false, bool forwarded = false, bool guessing = false) const;
    void resendMessage(const QString& jid, const QString& id);
    
public slots:
    void onMessageReceived(const QXmppMessage& message);
#if (QXMPP_VERSION) < QT_VERSION_CHECK(1, 5, 0)
    void onCarbonMessageReceived(const QXmppMessage& message);
    void onCarbonMessageSent(const QXmppMessage& message);
#endif
    void onReceiptReceived(const QString& jid, const QString& id);    
    void onUploadSlotReceived(const QXmppHttpUploadSlotIq& slot);
    void onUploadSlotRequestFailed(const QXmppHttpUploadRequestIq& request);
    void onDownloadFileComplete(const std::list<Shared::MessageInfo>& msgs, const QString& path);
    void onUploadFileComplete(const std::list<Shared::MessageInfo>& msgs, const QString& url, const QString& path);
    void onLoadFileError(const std::list<Shared::MessageInfo>& msgs, const QString& path, bool up);
    void requestChangeMessage(const QString& jid, const QString& messageId, const QMap<QString, QVariant>& data);
    
private:
    bool handleChatMessage(const QXmppMessage& msg, bool outgoing = false, bool forwarded = false, bool guessing = false);
    bool handleGroupMessage(const QXmppMessage& msg, bool outgoing = false, bool forwarded = false, bool guessing = false);
    void logMessage(const QXmppMessage& msg, const QString& reason = "Message wasn't handled: ");
    void sendMessageWithLocalUploadedFile(Shared::Message msg, const QString& url, bool newMessage = true);
    void performSending(Shared::Message data, const QString& originalId, bool newMessage = true);
    void prepareUpload(const Shared::Message& data, bool newMessage = true);
    void handleUploadError(const QString& jid, const QString& messageId, const QString& errorText);
    QXmppMessage createPacket(const Shared::Message& data, const QDateTime& time, const QString& originalId) const;
    QMap<QString, QVariant> getChanges(Shared::Message& data, const QDateTime& time, bool newMessage, const QString& originalId) const;
    std::optional<Shared::MessageInfo> getOriginalPendingMessageId(const QString& id, bool clear = true);
    bool handlePendingMessageError(const QString& id, const QString& errorText);
    std::pair<Shared::Message::State, QString> scheduleSending(const Shared::Message& message, const QDateTime& sendTime, const QString& originalId);
    bool adjustPendingMessage(const QString& messageId, const QMap<QString, QVariant>& data, bool final);
    
private:
    Account* acc;
    std::map<QString, QString> pendingStateMessages;        //key is message id, value is JID
    std::map<QString, QString> pendingCorrectionMessages;   //key is new mesage, value is originalOne
    std::deque<std::pair<QFileInfo, QString>> uploadingSlotsQueue;
};

}