const request = require('request-promise');
const humanizeDuration = require('humanize-duration');

function getTimesheetSummaryTotalsRequest(config, username, date) {
    const options = {
        uri: `${config.synergist.apiUrl}jsonapi/timesheets.json`,
        qs: {
            username,
            password: config.synergist.password,
            date,
            user: config.synergist.superuser,
            version: config.synergist.version,
            company: config.synergist.company,
            action: 'timesheetsummaryresource'
        }
    };

    return request(options);
}

function makeGetTimesheetCompleted(config, logger, date) {
    return async shortName => {
        try {
            const response = await getTimesheetSummaryTotalsRequest(config, shortName, date);

            try {
                const data = JSON.parse(response);

                const hoursChargeable = data.resource[0].variable_timesheetsummaryresourcechargeable;
                const hoursNonChargeable = data.resource[0].variable_timesheetsummaryresourcenonchargeable;

                const hoursRequired = data.resource[0].variable_timesheethoursrequired;

                const complete = hoursChargeable + hoursNonChargeable >= hoursRequired;

                return complete;

            } catch (err) {
                logger.warn('Empty timesheet response for user', { shortName, date });
                logger.error(err.stack);

                return null;
            }

        } catch (requestErr) {
            logger.warn('Timesheet request failed for user', { shortName, date });
            logger.error(requestErr.stack);

            return null;
        }
    };
}

async function getUsersWithMissingTimesheets(config, logger, range, users) {
    logger.debug('[SYNERGIST] Getting employee timesheet information...');
    const t0 = Date.now();

    const startDate = range.start.format('DD/MM/YYYY');

    const getTimesheetCompleted = makeGetTimesheetCompleted(config, logger, startDate);

    const results = await Promise.all(users.map(user =>
        getTimesheetCompleted(user.shortName)
    ));

    const t1 = Date.now();
    logger.debug(`[SYNERGIST] Took ${humanizeDuration(t1 - t0)} to fetch timesheet information`);

    return users.filter((user, index) => results[index] !== null && !results[index]);
}

module.exports = {
    getUsersWithMissingTimesheets
};