const moment = require('moment');

const { makeUserCrud } = require('server/modules/users');

const {
    getAllSlackUsersWithNames,
    annoySlackUsers
} = require('server/modules/slack');

const {
    getAllUsersOnHoliday
} = require('server/modules/whosoff');

const {
    getUsersWithMissingTimesheets
} = require('server/modules/synergist');

function getPreviousWeekPeriod(now) {
    const start = now.clone()
        .startOf('isoWeek')
        .subtract(1, 'weeks');

    const end = now.clone()
        .startOf('isoWeek')
        .subtract(1, 'days')
        .endOf('day');

    return { start, end };
}

function annoyUsers(config, db, logger) {
    const crud = makeUserCrud();

    return async (req, res) => {
        const now = moment();

        const range = getPreviousWeekPeriod(now);

        const validUsers = await crud.getDocs(db);

        const validUserEmails = validUsers.map(({ email }) => email.toLowerCase());

        const [slackUsers, usersOnHoliday] = await Promise.all([
            getAllSlackUsersWithNames(config, logger),
            getAllUsersOnHoliday(config, logger, now)
        ]);

        const users = slackUsers.filter(({ email }) =>
            validUserEmails.includes(email) &&
            !usersOnHoliday.includes(email)
        );

        const usersMissingTimesheet = await getUsersWithMissingTimesheets(config, logger, range, users);

        await annoySlackUsers(config, logger, now, usersMissingTimesheet);

        res.json({ ok: true });
    };
}

module.exports = {
    getPreviousWeekPeriod,
    annoyUsers
};