const UserError = require('vn-loopback/util/user-error');

module.exports = Self => {
    Self.remoteMethodCtx('createAbsence', {
        description: 'Creates a new worker absence',
        accepts: [{
            arg: 'id',
            type: 'number',
            description: 'The worker id',
            http: {source: 'path'}
        },
        {
            arg: 'businessFk',
            type: 'number',
            required: true
        },
        {
            arg: 'absenceTypeId',
            type: 'number',
            required: true
        },
        {
            arg: 'dated',
            type: 'date',
            required: true
        }],
        returns: {
            type: 'Object',
            root: true
        },
        http: {
            path: `/:id/createAbsence`,
            verb: 'POST'
        }
    });

    Self.createAbsence = async(ctx, id, options) => {
        const models = Self.app.models;
        const $t = ctx.req.__; // $translate
        const args = ctx.args;
        const userId = ctx.req.accessToken.userId;

        let tx;
        const myOptions = {};

        if (typeof options == 'object')
            Object.assign(myOptions, options);

        if (!myOptions.transaction) {
            tx = await Self.beginTransaction({});
            myOptions.transaction = tx;
        }

        try {
            const isSubordinate = await models.Worker.isSubordinate(ctx, id, myOptions);
            const isTeamBoss = await models.ACL.checkAccessAcl(ctx, 'Worker', 'isTeamBoss', 'WRITE');

            if (!isSubordinate || (isSubordinate && userId == id && !isTeamBoss))
                throw new UserError(`You don't have enough privileges`);

            const canCreateAbsenceInPast =
                await models.ACL.checkAccessAcl(ctx, 'Worker', 'canCreateAbsenceInPast', 'WRITE');
            const now = Date.vnNew();
            const newDate = new Date(args.dated).getTime();

            if ((now.getTime() > newDate) && !canCreateAbsenceInPast)
                throw new UserError(`Holidays to past days not available`);

            const labour = await models.WorkerLabour.findById(args.businessFk,
                {fields: ['started', 'ended', 'businessFk']}, myOptions);

            if (args.dated < labour.started || (labour.ended != null && args.dated > labour.ended))
                throw new UserError(`The contract was not active during the selected date`);

            const [hasHoursRecorded] = await Self.rawSql(`SELECT *
                FROM vn.workerTimeControl
                WHERE userFk = ? AND timed BETWEEN DATE(?) AND CONCAT(DATE(?), ' 23:59:59')
                LIMIT 1;`, [id, args.dated, args.dated]);

            const absenceType = await models.AbsenceType.findById(args.absenceTypeId, null, myOptions);

            const isNotHalfAbsence = absenceType.code != 'halfHoliday'
                                        && absenceType.code != 'halfPaidLeave'
                                        && absenceType.code != 'halfFurlough';

            if (hasHoursRecorded && isNotHalfAbsence)
                throw new UserError(`The worker has hours recorded that day`);

            const date = Date.vnNew();
            date.setHours(0, 0, 0, 0);
            const [result] = await Self.rawSql(
                `SELECT COUNT(*) halfHolidayCounter
                    FROM vn.calendar c
                        JOIN vn.business b ON b.id = c.businessFk
                        JOIN vn.absenceType at ON at.id = c.dayOffTypeFk
                    WHERE at.code = 'halfHoliday'
                        AND b.workerFk = ?
                        AND c.dated BETWEEN util.firstDayOfYear(?)
                        AND LAST_DAY(DATE_ADD(?, INTERVAL 12 - MONTH(?) MONTH))`, [id, date, now, now]);

            const hasHalfHoliday = result.halfHolidayCounter > 0;
            const isHalfHoliday = absenceType.code === 'halfHoliday';

            if (isHalfHoliday && hasHalfHoliday)
                throw new UserError(`Cannot add more than one '1/2 day vacation'`);

            const isFestive = absenceType.isFestiveEligible;

            const workCenter = await models.Business.findOne({
                where: {id: args.businessFk}
            },);

            const [holiday] = await models.CalendarHoliday.find({
                where: {
                    dated: args.dated,
                    workCenterFk: workCenter.workCenterFk
                }
            });
            if ((holiday && isFestive) && (workCenter.workcenterFk === holiday.workCenterFk))
                throw new UserError(`Cannot add holidays on this day`);

            const absence = await models.Calendar.create({
                businessFk: labour.businessFk,
                dayOffTypeFk: args.absenceTypeId,
                dated: args.dated
            }, myOptions);

            const account = await models.VnUser.findById(userId, null, myOptions);
            const subordinated = await models.VnUser.findById(id, null, myOptions);
            const worker = await models.Worker.findById(subordinated.id, null, myOptions);
            const departmentBoss = await models.VnUser.findById(worker.bossFk, null, myOptions);
            const url = await Self.app.models.Url.getUrl();
            const body = $t('Created absence', {
                author: account.nickname,
                employee: subordinated.nickname,
                absenceType: absenceType.name,
                dated: formatDate(args.dated),
                workerUrl: `${url}worker/${id}/calendar`
            });
            await models.Mail.create({
                subject: $t('Absence change notification on the labour calendar'),
                body: body,
                receiver: departmentBoss.email
            }, myOptions);

            if (tx) await tx.commit();

            return absence;
        } catch (e) {
            if (tx) await tx.rollback();
            throw e;
        }
    };

    function formatDate(date) {
        let day = date.getDate();
        if (day < 10) day = `0${day}`;

        let month = date.getMonth() + 1;
        if (month < 10) month = `0${month}`;
        let year = date.getFullYear();

        return `${day}-${month}-${year}`;
    }
};