const { getMailbox, updateMailbox } = require("../../db/imap/imap");
const { DEBUG } = require("../../utils/debug");
const { registerMessageInApp } = require("../saveMessage");
const { saveMessage } = require("../storeMessage");

class Box {
    constructor(_imap, boxId, _boxName) {
        this.imap = _imap;
        this.boxName = _boxName;
        this.id = boxId;
        this.box;
        this.init();
    }

    async init() {
        this.box = (await getMailbox(this.id))[0];

        const readOnly = true;
        this.imap.openBox(this.boxName, readOnly, (err, box) => {
            if (err) DEBUG.log(err);
            this.sync(this.box.uidnext, box.uidnext);
        });
    }

    sync(savedUid, currentUid) {
        const promises = [];
        const mails = [];
        const f = this.imap.seq.fetch(`${savedUid}:${currentUid}`, {
            size: true,
            envelope: true,
        });

        f.on("message", (msg, seqno) => {
            msg.once("attributes", (attrs) => {
                mails.push(attrs);
                promises.push(saveMessage(attrs, this.id, this.imap));
            });
        });

        f.once("error", (err) => {
            DEBUG.log("Fetch error: " + err);
        });

        f.once("end", async () => {
            await Promise.all(promises).then(async (res) => {
                for (let i = 0; i < mails.length; i++) {
                    console.log(i, mails[i].uid)
                    await registerMessageInApp(res[i], mails[i]);
                }
            });
            updateMailbox(this.id, currentUid);
        });
    }
}

module.exports = {
    Box,
};