import ngModule from '../module';
import Component from 'core/lib/component';
import './style.scss';

class Controller extends Component {
    constructor($element, $, vnWeekDays) {
        super($element, $);
        this.vnWeekDays = vnWeekDays;
        this.nMonths = 4;

        let date = new Date();
        date.setDate(1);
        date.setHours(0, 0, 0, 0);
        this.date = date;
    }

    get date() {
        return this._date;
    }

    set date(value) {
        this._date = value;
        let stamp = value.getTime();

        let firstDay = new Date(stamp);
        firstDay.setDate(1);
        this.firstDay = firstDay;

        let lastDay = new Date(stamp);
        lastDay.setMonth(lastDay.getMonth() + this.nMonths);
        lastDay.setDate(0);
        this.lastDay = lastDay;

        this.months = [];
        for (let i = 0; i < this.nMonths; i++) {
            let monthDate = new Date(stamp);
            monthDate.setMonth(value.getMonth() + i);
            this.months.push(monthDate);
        }

        this.refreshEvents();
    }

    step(direction) {
        let date = new Date(this.date.getTime());
        date.setMonth(date.getMonth() + (this.nMonths * direction));
        this.date = date;

        this.emit('step');
    }

    get data() {
        return this._data;
    }

    set data(value) {
        this._data = value;

        value = value || {};

        this.events = value.events;

        function toStamp(date) {
            return date && new Date(date).setHours(0, 0, 0, 0);
        }

        this.exclusions = {};
        let exclusions = value.exclusions;

        if (exclusions) {
            for (let exclusion of exclusions) {
                let stamp = toStamp(exclusion.dated);
                if (!this.exclusions[stamp]) this.exclusions[stamp] = [];
                this.exclusions[stamp].push(exclusion);
            }
        }

        let events = value.events;

        if (events) {
            for (let event of events) {
                event.dated = toStamp(event.dated);
                event.ended = toStamp(event.ended);
                event.started = toStamp(event.started);
                event.wdays = this.vnWeekDays.fromSet(event.weekDays);
            }
        }

        this.refreshEvents();

        let calendars = this.element.querySelectorAll('vn-calendar');
        for (let calendar of calendars)
            calendar.$ctrl.repaint();
    }

    refreshEvents() {
        this.days = {};
        if (!this.data) return;

        let day = new Date(this.firstDay.getTime());

        while (day <= this.lastDay) {
            let stamp = day.getTime();
            let wday = day.getDay();
            let dayEvents = [];
            let exclusions = this.exclusions[stamp] || [];

            if (this.events) {
                for (let event of this.events) {
                    let match;

                    switch (event.type) {
                    case 'day':
                        match = event.dated == stamp;
                        break;
                    default:
                        match = event.wdays[wday]
                            && (!event.started || stamp >= event.started)
                            && (!event.ended || stamp <= event.ended);
                        break;
                    }

                    if (match && !exclusions.find(e => e.zoneFk == event.zoneFk))
                        dayEvents.push(event);
                }
            }

            if (dayEvents.length)
                this.days[stamp] = dayEvents;

            day.setDate(day.getDate() + 1);
        }
    }

    onSelection($event, $days, $type, $weekday) {
        let $events = [];
        let $exclusions = [];

        for (let day of $days) {
            let stamp = day.getTime();
            $events = $events.concat(this.days[stamp] || []);
            $exclusions = $exclusions.concat(this.exclusions[stamp] || []);
        }

        this.emit('selection', {
            $event,
            $days,
            $type,
            $weekday,
            $events,
            $exclusions
        });
    }

    hasEvents(day) {
        let stamp = day.getTime();
        return this.days[stamp] || this.exclusions[stamp];
    }

    getClass(day) {
        let stamp = day.getTime();
        return this.exclusions[stamp] && !this.days[stamp]
            ? 'excluded' : '';
    }
}
Controller.$inject = ['$element', '$scope', 'vnWeekDays'];

ngModule.vnComponent('vnZoneCalendar', {
    template: require('./index.html'),
    controller: Controller,
    bindings: {
        data: '<?'
    }
});