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

module.exports = Self => {
    Self.remoteMethodCtx('absences', {
        description: 'Returns an array of absences from an specified worker',
        accessType: '',
        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, started, ended) => {
        const models = Self.app.models;
        const conn = Self.dataSource.connector;
        const myUserId = ctx.req.accessToken.userId;
        const myWorker = await models.Worker.findOne({where: {userFk: myUserId}});
        const calendar = {totalHolidays: 0, holidaysEnjoyed: 0};
        const holidays = [];
        const stmts = [];

        // Get subordinates
        stmts.push(new ParameterizedSQL('CALL vn.subordinateGetList(?)', [myWorker.id]));
        let subordinatesIndex = stmts.push('SELECT * FROM tmp.subordinate') - 1;
        let sql = ParameterizedSQL.join(stmts, ';');
        let result = await conn.executeStmt(sql);

        const subordinates = result[subordinatesIndex];
        const isSubordinate = subordinates.find(subordinate => {
            return subordinate.workerFk === workerFk;
        });
        const isHr = await models.Account.hasRole(myUserId, 'hr');

        if (!isHr && workerFk !== myWorker.id && !isSubordinate)
            throw new UserError(`You don't have enough privileges`);


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

        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 = started.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: [started, ended]}
                            }
                        }
                    }
                }
            }],
            where: {
                and: [
                    {workerFk: workerFk},
                    {or: [{
                        ended: {gte: [started]}
                    }, {ended: null}]}
                ],

            }
        });

        // Get number of total holidays
        contracts.forEach(contract => {
            let totalHolidays = contract.holidays().days;

            if (contract.started && contract.ended)
                totalHolidays = getHolidaysByContract(started, contract);

            calendar.totalHolidays += totalHolidays;


            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(started, contract) {
        const dayTimestamp = 1000 * 60 * 60 * 24;
        const endedTime = contract.ended.getTime();
        const startedTime = started.getTime();
        const contractDays = Math.floor((endedTime - startedTime) / dayTimestamp);

        if (contractDays < 365) {
            let holidays = contract.holidays().days * (contractDays + 1) / 365;
            let integerPart = parseInt(holidays);
            let decimalPart = holidays - integerPart;
            let decimal = decimalPart >= 0.5 ? 0.5 : 0;

            holidays = integerPart + decimal;

            return holidays;
        }

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