const ParameterizedSQL = require('loopback-connector').ParameterizedSQL;

module.exports = Self => {
    Self.remoteMethodCtx('sendMail', {
        description: `Send an email with the hours booked to the employees who telecommuting.
        It also inserts booked hours in cases where the employee is telecommuting`,
        accessType: 'WRITE',
        accepts: [{
            arg: 'workerId',
            type: 'number',
            description: 'The worker id'
        },
        {
            arg: 'week',
            type: 'number'
        },
        {
            arg: 'year',
            type: 'number'
        }],
        returns: [{
            type: 'Object',
            root: true
        }],
        http: {
            path: `/sendMail`,
            verb: 'POST'
        }
    });

    Self.sendMail = async(ctx, options) => {
        const models = Self.app.models;
        const conn = Self.dataSource.connector;
        const args = ctx.args;
        let tx;
        const myOptions = {};

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

        const stmts = [];
        let stmt;

        if (!args.week || !args.year) {
            const from = Date.vnNew();
            const to = Date.vnNew();

            const time = await models.Time.findOne({
                where: {
                    dated: {between: [from.setDate(from.getDate() - 10), to.setDate(to.getDate() - 4)]}
                },
                order: 'week ASC'
            }, myOptions);

            args.week = time.week;
            args.year = time.year;
        }

        const started = getStartDateOfWeekNumber(args.week, args.year);
        started.setHours(0, 0, 0, 0);

        const ended = new Date(started);
        ended.setDate(started.getDate() + 6);
        ended.setHours(23, 59, 59, 999);

        stmts.push('DROP TEMPORARY TABLE IF EXISTS tmp.timeControlCalculate');
        stmts.push('DROP TEMPORARY TABLE IF EXISTS tmp.timeBusinessCalculate');

        if (args.workerId) {
            await models.WorkerTimeControl.destroyAll({
                userFk: args.workerId,
                timed: {between: [started, ended]},
                isSendMail: true
            }, myOptions);

            const where = {
                workerFk: args.workerId,
                year: args.year,
                week: args.week
            };
            await models.WorkerTimeControlMail.updateAll(where, {
                updated: Date.vnNew(), state: 'SENDED'
            }, myOptions);

            stmt = new ParameterizedSQL('DROP TEMPORARY TABLE IF EXISTS tmp.`user`');
            stmts.push(stmt);
            stmt = new ParameterizedSQL('CREATE TEMPORARY TABLE tmp.`user` SELECT id userFk FROM account.user WHERE id = ?', [args.workerId]);
            stmts.push(stmt);
        } else {
            await models.WorkerTimeControl.destroyAll({
                timed: {between: [started, ended]},
                isSendMail: true
            }, myOptions);

            const where = {
                year: args.year,
                week: args.week
            };
            await models.WorkerTimeControlMail.updateAll(where, {
                updated: Date.vnNew(), state: 'SENDED'
            }, myOptions);

            stmt = new ParameterizedSQL('DROP TEMPORARY TABLE IF EXISTS tmp.`user`');
            stmts.push(stmt);
            stmt = new ParameterizedSQL('CREATE TEMPORARY TABLE IF NOT EXISTS tmp.`user` SELECT userFk FROM vn.worker w JOIN account.`user` u ON u.id = w.userFk WHERE userFk IS NOT NULL');
            stmts.push(stmt);
        }

        stmt = new ParameterizedSQL(
            `CALL vn.timeControl_calculate(?, ?)
            `, [started, ended]);
        stmts.push(stmt);

        stmt = new ParameterizedSQL(
            `CALL vn.timeBusiness_calculate(?, ?)
                `, [started, ended]);
        stmts.push(stmt);

        stmt = new ParameterizedSQL(
            `CALL vn.timeControl_getError(?, ?)
                `, [started, ended]);
        stmts.push(stmt);

        stmt = new ParameterizedSQL(`INSERT INTO mail (receiver, subject, body)
                                        SELECT  CONCAT(u.name, '@verdnatura.es'),
                                                CONCAT('Error registro de horas semana ', ?, ' año ', ?) ,
                                                CONCAT('No se ha podido enviar el registro de horas al empleado/s: ', GROUP_CONCAT(DISTINCT CONCAT('<br>', w.id, ' ', w.firstName, ' ', w.lastName)))
                                            FROM tmp.timeControlError tce
                                                JOIN vn.workerTimeControl wtc ON wtc.id = tce.id
                                                JOIN worker w ON w.id = wtc.userFK
                                                JOIN account.user u ON u.id = w.bossFk
                                            GROUP BY w.bossFk`, [args.week, args.year]);
        stmts.push(stmt);

        stmt = new ParameterizedSQL(`
            SELECT CONCAT(u.name, '@verdnatura.es') receiver,
                u.id workerFk,
                tb.dated,
                tb.timeWorkDecimal,
                tb.timeWorkSexagesimal timeWorkSexagesimal,
                tb.timeTable,
                tc.timeWorkDecimal timeWorkedDecimal,
                tc.timeWorkSexagesimal timeWorkedSexagesimal,
                tb.type,
                tb.businessFk,
                tb.permissionRate,
                d.isTeleworking
            FROM tmp.timeBusinessCalculate tb
                JOIN account.user u ON u.id = tb.userFk
                JOIN department d ON d.id = tb.departmentFk
                JOIN business b ON b.id = tb.businessFk
                LEFT JOIN tmp.timeControlCalculate tc ON tc.userFk = tb.userFk AND tc.dated = tb.dated
                LEFT JOIN worker w ON w.id = u.id
                LEFT JOIN (
                    SELECT DISTINCT wtc.userFk
                        FROM tmp.timeControlError tce
                            JOIN vn.workerTimeControl wtc ON wtc.id = tce.id
                 )sub ON sub.userFk = tb.userFk
            WHERE sub.userFK IS NULL
                AND IFNULL(?, u.id) = u.id
                AND b.companyCodeFk = 'VNL'
                AND w.businessFk
                AND d.isTeleworking
            ORDER BY u.id, tb.dated
            `, [args.workerId]);
        const index = stmts.push(stmt) - 1;

        stmts.push('DROP TEMPORARY TABLE tmp.timeControlCalculate');
        stmts.push('DROP TEMPORARY TABLE tmp.timeBusinessCalculate');

        const sql = ParameterizedSQL.join(stmts, ';');
        const days = await conn.executeStmt(sql, myOptions);

        let previousWorkerFk = days[index][0].workerFk;
        let previousReceiver = days[index][0].receiver;

        const workerTimeControlConfig = await models.WorkerTimeControlConfig.findOne(null, myOptions);

        for (let day of days[index]) {
            if (!myOptions.transaction) {
                tx = await Self.beginTransaction({});
                myOptions.transaction = tx;
            }
            try {
                workerFk = day.workerFk;
                if (day.timeWorkDecimal > 0 && day.timeWorkedDecimal == null
                    && (day.permissionRate == null ? true : day.permissionRate)) {
                    if (day.timeTable == null) {
                        const timed = new Date(day.dated);
                        await models.WorkerTimeControl.create({
                            userFk: day.workerFk,
                            timed: timed.setHours(workerTimeControlConfig.teleworkingStart / 3600),
                            manual: true,
                            direction: 'in',
                            isSendMail: true
                        }, myOptions);

                        if (day.timeWorkDecimal >= workerTimeControlConfig.timeToBreakTime / 3600) {
                            await models.WorkerTimeControl.create({
                                userFk: day.workerFk,
                                timed: timed.setHours(workerTimeControlConfig.teleworkingStartBreakTime / 3600),
                                manual: true,
                                direction: 'middle',
                                isSendMail: true
                            }, myOptions);

                            await models.WorkerTimeControl.create({
                                userFk: day.workerFk,
                                timed: timed.setHours(
                                    workerTimeControlConfig.teleworkingStartBreakTime / 3600,
                                    workerTimeControlConfig.breakTime / 60
                                ),
                                manual: true,
                                direction: 'middle',
                                isSendMail: true
                            }, myOptions);
                        }

                        const [hoursWork, minutesWork, secondsWork] = getTime(day.timeWorkSexagesimal);
                        await models.WorkerTimeControl.create({
                            userFk: day.workerFk,
                            timed: timed.setHours(
                                workerTimeControlConfig.teleworkingStart / 3600 + hoursWork,
                                minutesWork,
                                secondsWork
                            ),
                            manual: true,
                            direction: 'out',
                            isSendMail: true
                        }, myOptions);
                    } else {
                        const weekDay = day.dated.getDay();
                        const journeys = await models.BusinessSchedule.find({
                            where: {
                                businessFk: day.businessFk,
                                weekday: weekDay
                            }
                        }, myOptions);

                        let timeTableDecimalInSeconds = 0;
                        for (let journey of journeys) {
                            const start = Date.vnNew();
                            const [startHours, startMinutes, startSeconds] = getTime(journey.started);
                            start.setHours(startHours, startMinutes, startSeconds, 0);

                            const end = Date.vnNew();
                            const [endHours, endMinutes, endSeconds] = getTime(journey.ended);
                            end.setHours(endHours, endMinutes, endSeconds, 0);

                            const result = (end - start) / 1000;
                            timeTableDecimalInSeconds += result;
                        }

                        for (let journey of journeys) {
                            const timeTableDecimal = timeTableDecimalInSeconds / 3600;
                            if (day.timeWorkDecimal == timeTableDecimal) {
                                const timed = new Date(day.dated);
                                const [startHours, startMinutes, startSeconds] = getTime(journey.started);
                                await models.WorkerTimeControl.create({
                                    userFk: day.workerFk,
                                    timed: timed.setHours(startHours, startMinutes, startSeconds),
                                    manual: true,
                                    isSendMail: true
                                }, myOptions);

                                const [endHours, endMinutes, endSeconds] = getTime(journey.ended);
                                await models.WorkerTimeControl.create({
                                    userFk: day.workerFk,
                                    timed: timed.setHours(endHours, endMinutes, endSeconds),
                                    manual: true,
                                    isSendMail: true
                                }, myOptions);
                            } else {
                                const minStart = journeys.reduce(function(prev, curr) {
                                    return curr.start < prev.start ? curr : prev;
                                });
                                if (journey == minStart) {
                                    const timed = new Date(day.dated);
                                    const [startHours, startMinutes, startSeconds] = getTime(journey.started);
                                    await models.WorkerTimeControl.create({
                                        userFk: day.workerFk,
                                        timed: timed.setHours(startHours, startMinutes, startSeconds),
                                        manual: true,
                                        isSendMail: true
                                    }, myOptions);

                                    const [hoursWork, minutesWork, secondsWork] = getTime(day.timeWorkSexagesimal);
                                    await models.WorkerTimeControl.create({
                                        userFk: day.workerFk,
                                        timed: timed.setHours(
                                            startHours + hoursWork,
                                            startMinutes + minutesWork,
                                            startSeconds + secondsWork
                                        ),
                                        manual: true,
                                        isSendMail: true
                                    }, myOptions);
                                }
                            }

                            if (day.timeWorkDecimal >= workerTimeControlConfig.timeToBreakTime / 3600) {
                                const minStart = journeys.reduce(function(prev, curr) {
                                    return curr.start < prev.start ? curr : prev;
                                });
                                if (journey == minStart) {
                                    const timed = new Date(day.dated);
                                    const [startHours, startMinutes, startSeconds] = getTime(journey.started);
                                    await models.WorkerTimeControl.create({
                                        userFk: day.workerFk,
                                        timed: timed.setHours(startHours + 1, startMinutes, startSeconds),
                                        manual: true,
                                        isSendMail: true
                                    }, myOptions);

                                    await models.WorkerTimeControl.create({
                                        userFk: day.workerFk,
                                        timed: timed.setHours(startHours + 1, startMinutes + 20, startSeconds),
                                        manual: true,
                                        isSendMail: true
                                    }, myOptions);
                                }
                            }
                        }
                        const timed = new Date(day.dated);
                        const firstWorkerTimeControl = await models.WorkerTimeControl.findOne({
                            where: {
                                userFk: day.workerFk,
                                timed: {between: [timed.setHours(0, 0, 0, 0), timed.setHours(23, 59, 59, 999)]}
                            },
                            order: 'timed ASC'
                        }, myOptions);

                        if (firstWorkerTimeControl)
                            await firstWorkerTimeControl.updateAttribute('direction', 'in', myOptions);

                        const lastWorkerTimeControl = await models.WorkerTimeControl.findOne({
                            where: {
                                userFk: day.workerFk,
                                timed: {between: [timed.setHours(0, 0, 0, 0), timed.setHours(23, 59, 59, 999)]}
                            },
                            order: 'timed DESC'
                        }, myOptions);

                        if (lastWorkerTimeControl)
                            await lastWorkerTimeControl.updateAttribute('direction', 'out', myOptions);
                    }
                }

                const lastDay = days[index][days[index].length - 1];
                if (day.workerFk != previousWorkerFk || day == lastDay) {
                    const query = `INSERT IGNORE INTO workerTimeControlMail (workerFk, year, week)
                                    VALUES(?, ?, ?);`;
                    await Self.rawSql(query, [previousWorkerFk, args.year, args.week]);

                    ctx.args = {
                        recipient: previousReceiver,
                        year: args.year,
                        week: args.week,
                        workerId: previousWorkerFk,
                        state: 'SENDED'
                    };
                    await models.WorkerTimeControl.weeklyHourRecordEmail(ctx, myOptions);

                    previousWorkerFk = day.workerFk;
                    previousReceiver = day.receiver;
                }

                if (tx) {
                    await tx.commit();
                    delete myOptions.transaction;
                }
            } catch (e) {
                if (tx) await tx.rollback();
                throw e;
            }
        }

        return true;
    };

    function getStartDateOfWeekNumber(week, year) {
        const simple = new Date(year, 0, 1 + (week - 1) * 7);
        const dow = simple.getDay();
        const weekStart = simple;
        if (dow <= 4)
            weekStart.setDate(simple.getDate() - simple.getDay() + 1);
        else
            weekStart.setDate(simple.getDate() + 8 - simple.getDay());
        return weekStart;
    }

    function getTime(timeString) {
        const [hours, minutes, seconds] = timeString.split(':');
        return [parseInt(hours), parseInt(minutes), parseInt(seconds)];
    }
};