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

module.exports = Self => {
    Self.remoteMethodCtx('absences', {
        description: 'Returns an array of absences from an specified worker',
        accepts: [{
            arg: 'workerFk',
            type: 'Number',
            required: true,
        },
        {
            arg: 'started',
            type: 'Date',
            required: true,
        },
        {
            arg: 'ended',
            type: 'Date',
            required: true,
        }],
        returns: [{
            arg: 'calendar'
        },
        {
            arg: 'absences',
            type: 'Number'
        },
        {
            arg: 'holidays',
            type: 'Number'
        }],
        http: {
            path: `/absences`,
            verb: 'GET'
        }
    });

    Self.absences = async(ctx, workerFk, yearStarted, yearEnded) => {
        const models = Self.app.models;
        const isSubordinate = await models.Worker.isSubordinate(ctx, workerFk);

        if (!isSubordinate)
            throw new UserError(`You don't have enough privileges`);

        const calendar = {totalHolidays: 0, holidaysEnjoyed: 0};
        const holidays = [];

        // Get absences of year
        let absences = await Self.find({
            include: {
                relation: 'absenceType'
            },
            where: {
                workerFk: workerFk,
                dated: {between: [yearStarted, yearEnded]}
            }
        });

        absences.forEach(absence => {
            if (absence.absenceType().id === 1)
                calendar.holidaysEnjoyed++;

            absence.dated = new Date(absence.dated);
            absence.dated.setHours(0, 0, 0, 0);
        });

        // Get active contracts on current year
        const year = yearStarted.getFullYear();
        const contracts = await models.WorkerLabour.find({
            include: [{
                relation: 'holidays',
                scope: {
                    where: {year}
                }
            },
            {
                relation: 'workCenter',
                scope: {
                    include: {
                        relation: 'holidays',
                        scope: {
                            include: [{
                                relation: 'detail'
                            },
                            {
                                relation: 'type'
                            }],
                            where: {
                                dated: {between: [yearStarted, yearEnded]}
                            }
                        }
                    }
                }
            }],
            where: {
                and: [
                    {workerFk: workerFk},
                    {or: [{
                        ended: {gte: [yearStarted]}
                    }, {ended: null}]}
                ],

            }
        });

        // Get number of total holidays
        contracts.forEach(contract => {
            calendar.totalHolidays += getHolidaysByContract(contract, yearEnded);

            let holidayList = contract.workCenter().holidays();
            for (let day of holidayList) {
                day.dated = new Date(day.dated);
                day.dated.setHours(0, 0, 0, 0);

                holidays.push(day);
            }
        });

        return [calendar, absences, holidays];
    };

    function getHolidaysByContract(contract, endOfYear) {
        const dayTimestamp = 1000 * 60 * 60 * 24;

        const started = contract.started;
        const ended = contract.ended;
        const startedTime = started.getTime();
        const endedTime = ended && ended.getTime() || endOfYear;

        const contractDays = Math.floor((endedTime - startedTime) / dayTimestamp);

        if (contractDays < 365) {
            let holidays = Math.round(2 * contract.holidays().days * (contractDays + 1) / 365) / 2;

            return holidays;
        }

        return contract.holidays().days;
    }
};