const {
    createRoom,
    registerMessageInRoom,
    createThread,
    registerMessageInThread,
    isRoomGroup,
    findRoomsFromMessage,
    hasSameMembersAsParent,
} = require("../db/saveMessageApp");

const { findRoomByOwner, getAddresseId, getUserIdOfMailbox } = require("../db/mail");
const { nbMembers } = require("./utils/statusUtils");

/**
 * take object address and join mailbox and host to return mailbox@host
 */
function createAddress(elt) {
    return `${elt.mailbox}@${elt.host}`;
}

async function initiateRoom(envelope, ownerId, messageId, isSeen) {
    await createRoom(envelope.subject, ownerId, messageId).then(async (roomId) => {
        // todo register members
        await registerMessageInRoom(messageId, roomId, isSeen, envelope.date);
    });
}

const roomType = {
    ROOM: 'room',
    CHANNEL: 'channel',
    GROUP: 'group',
    DM: 'dm',
    THREAD: 'thread'
}

class registerMessageInApp {
    constructor(_messageId, _attrs, _boxId) {
        this.messageId = _messageId;
        this.attrs = _attrs;
        this.envelope = this.attrs.envelope;
        this.messageID = this.envelope.messageId;
        this.boxId = _boxId;
        this.isSeen = this.attrs.flags.includes("\\Seen") ? 1 : 0;
        this.ownerId;
        this.userId;
    }

    async init() {
        this.ownerId = await getAddresseId(createAddress(this.envelope.from[0])); // todo use sender or from ?
    }

    isDm = () => nbMembers(this.envelope) == 2;

    async isFromUs() {
        if (!this.userId) this.userId = (await getUserIdOfMailbox(this.boxId))[0]?.user_id;
        return this.ownerId == this.userId;
    }

    async initiateRoom(owner, roomType) {
        // todo roomType
        await createRoom(this.envelope.subject, owner, this.messageId).then(async (roomId) => {
            // todo register members
            await registerMessageInRoom(this.messageId, roomId, this.isSeen, this.envelope.date);
        });
    }

    async createOrRegisterOnExistence(owner, roomType) {
        await findRoomByOwner(owner).then(async (res) => {
            if (res.length == 0) {
                // first message with this sender
                await initiateRoom(owner, roomType);
            } else {
                // not a reply, add to the list of message if this sender
                await registerMessageInRoom(this.messageId, res[0].room_id, this.isSeen, this.envelope.date);
            }
        });
    }

    async createOrRegisterOnMembers(roomId) {
        const hasSameMembers = await hasSameMembersAsParent(this.messageID, this.envelope.inReplyTo);
        if (hasSameMembers) {
            await registerMessageInRoom(this.messageId, roomId, this.isSeen, this.envelope.date);
        } else {
            await createThread(this.envelope.subject, this.ownerId, this.messageId, roomId, this.isDm()).then(
                async (threadId) => {
                    await registerMessageInThread(this.messageId, threadId, this.isSeen);
                },
            );
        }
    }

    async save() {
        await this.init();
        if (this.envelope.inReplyTo) {
            this.saveReply();
        } else {
            if (await this.isFromUs()) {
                if (this.isDm()) {
                    // create or add new message to DM
                    const userTo = await getAddresseId(createAddress(this.envelope.to[0]));
                    await this.createOrRegisterOnExistence(userTo, roomType.DM);
                } else {
                    // it is not a reply and not a dm
                    // so it is a channel, which can be possibly a group
                    initiateRoom(this.envelope, this.ownerId, this.messageId, this.isSeen);
                }
            } else {
                await this.createOrRegisterOnExistence(this.ownerId, roomType.ROOM);
            }
        }
    }

    async saveReply() {
        const messageID = envelope.messageId;
        await findRoomsFromMessage(messageId).then(async (rooms) => {
            if (rooms.length == 0) {
                // no rooms, so is a transfer
                // todo test if members of transferred message are included
            } else if (rooms.length === 1) {
                // only one room so message is only in a room and not in a thread
                // as a thread is associated to a room
                await isRoomGroup(rooms[0].room_id).then(async (isGroup) => {
                    if (isGroup) {
                        this.createOrRegisterOnMembers(rooms[0].room_id);
                    } else {
                        // reply from channel
                        // todo
                        // if (sender == owner) { // correction from the original sender
                        //     // leave in the same channel
                        // }
                    }
                });
            } else if (rooms.length > 1) {
                // get the lowest thread (order by room_id)
                const roomId = rooms[rooms.length - 1].room_id;
                this.createOrRegisterOnMembers(roomId);
            }
        });
    }
}

module.exports = {
    registerMessageInApp,
    roomType
};