/**
 * Copyright 2018 Simon Redman <simon@ergotech.com>
 *
 * 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 2 of
 * the License or (at your option) version 3 or any later version
 * accepted by the membership of KDE e.V. (or its successor approved
 * by the membership of KDE e.V.), which shall act as a proxy
 * defined in Section 14 of version 3 of the license.
 *
 * 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 <https://www.gnu.org/licenses/>.
 */

#ifndef PLUGINS_TELEPHONY_CONVERSATIONMESSAGE_H_
#define PLUGINS_TELEPHONY_CONVERSATIONMESSAGE_H_

#include <QDBusMetaType>
#include <QLoggingCategory>

#include "kdeconnectinterfaces_export.h"

Q_DECLARE_LOGGING_CATEGORY(CONVERSATION_MESSAGE_LOGGING_CATEGORY)

class ConversationAddress;

class KDECONNECTINTERFACES_EXPORT ConversationMessage
{

public:
    // TYPE field values from Android
    enum Types {
        MessageTypeAll = 0,
        MessageTypeInbox = 1,
        MessageTypeSent = 2,
        MessageTypeDraft = 3,
        MessageTypeOutbox = 4,
        MessageTypeFailed = 5,
        MessageTypeQueued = 6,
    };

    /**
     * Values describing the possible type of events contained in a message
     * A message's eventField is constructed as a bitwise-OR of events
     * Any events which are unsupported should be ignored
     */
    enum Events {
        EventTextMessage = 0x1, // This message has a body field which contains pure, human-readable text
        EventMultiTarget = 0x2, // This is a multitarget (group) message which has an "addresses" field which is a list of participants in the group
    };

    /**
     * Build a new message from a keyword argument dictionary
     *
     * @param args mapping of field names to values as might be contained in a network packet containing a message
     */
    ConversationMessage(const QVariantMap& args = QVariantMap());

    ConversationMessage(const qint32& eventField, const QString& body, const QList<ConversationAddress>& addresses,
                        const qint64& date, const qint32& type, const qint32& read,
                        const qint64& threadID, const qint32& uID);

    ConversationMessage(const ConversationMessage& other);
    ~ConversationMessage();
    ConversationMessage& operator=(const ConversationMessage& other);
    static ConversationMessage fromDBus(const QDBusVariant&);
    static void registerDbusType();

    qint32 eventField() const { return m_eventField; }
    QString body() const { return m_body; }
    QList<ConversationAddress> addresses() const { return m_addresses; }
    qint64 date() const { return m_date; }
    qint32 type() const { return m_type; }
    qint32 read() const { return m_read; }
    qint64 threadID() const { return m_threadID; }
    qint32 uID() const { return m_uID; }

    QVariantMap toVariant() const;

    bool containsTextBody() const { return (eventField() & ConversationMessage::EventTextMessage); }
    bool isMultitarget() const { return (eventField() & ConversationMessage::EventMultiTarget); }

    bool isIncoming() const { return type() == MessageTypeInbox; }
    bool isOutgoing() const { return type() == MessageTypeSent; }

    /**
     * Return the address of the other party of a single-target conversation
     * Calling this method with a multi-target conversation is ill-defined
     */
    QString getOtherPartyAddress() const;

protected:
    /**
     * Bitwise OR of event flags
     * Unsupported flags shall cause the message to be ignored
     */
    qint32 m_eventField;

    /**
     * Body of the message
     */
    QString m_body;

    /**
     * List of all addresses involved in this conversation
     * An address is most likely a phone number, but may be something else like an email address
     */
    QList<ConversationAddress> m_addresses;

    /**
     * Date stamp (Unix epoch millis) associated with the message
     */
    qint64 m_date;

    /**
     * Type of the message. See the message.type enum
     */
    qint32 m_type;

    /**
     * Whether we have a read report for this message
     */
    qint32 m_read;

    /**
     * Tag which binds individual messages into a thread
     */
    qint64 m_threadID;

    /**
     * Value which uniquely identifies a message
     */
    qint32 m_uID;
};

class KDECONNECTINTERFACES_EXPORT ConversationAddress
{
public:
    ConversationAddress(QString address = QStringLiteral());
    ConversationAddress(const ConversationAddress& other);
    ~ConversationAddress();
    ConversationAddress& operator=(const ConversationAddress& other);

    QString address() const { return m_address; }

    QVariantMap toVariant() const;
private:
    QString m_address;
};

inline QDBusArgument &operator<<(QDBusArgument &argument, const ConversationMessage &message)
{
    argument.beginStructure();
    argument << message.eventField()
             << message.body()
             << message.addresses()
             << message.date()
             << message.type()
             << message.read()
             << message.threadID()
             << message.uID();
    argument.endStructure();
    return argument;
}

inline const QDBusArgument &operator>>(const QDBusArgument &argument, ConversationMessage &message)
{
    qint32 event;
    QString body;
    QList<ConversationAddress> addresses;
    qint64 date;
    qint32 type;
    qint32 read;
    qint64 threadID;
    qint32 uID;

    argument.beginStructure();
    argument >> event;
    argument >> body;
    argument >> addresses;
    argument >> date;
    argument >> type;
    argument >> read;
    argument >> threadID;
    argument >> uID;
    argument.endStructure();

    message = ConversationMessage(event, body, addresses, date, type, read, threadID, uID);

    return argument;
}

inline QDBusArgument& operator<<(QDBusArgument& argument, const ConversationAddress& address)
{
    argument.beginStructure();
    argument << address.address();
    argument.endStructure();
    return argument;
}

inline const QDBusArgument& operator>>(const QDBusArgument& argument, ConversationAddress& address)
{
    QString addressField;

    argument.beginStructure();
    argument >> addressField;
    argument.endStructure();

    address = ConversationAddress(addressField);

    return argument;
}

Q_DECLARE_METATYPE(ConversationMessage);
Q_DECLARE_METATYPE(ConversationAddress);

#endif /* PLUGINS_TELEPHONY_CONVERSATIONMESSAGE_H_ */