import { $gettext } from '../lib/gettext';
import eventBus from "./event-bus.ts";

eventBus.on('studip:set-locale', () => {
    Calendar.day_names = [
        $gettext('Montag'),
        $gettext('Dienstag'),
        $gettext('Mittwoch'),
        $gettext('Donnerstag'),
        $gettext('Freitag'),
        $gettext('Samstag'),
        $gettext('Sonntag'),
    ];
});

/* ------------------------------------------------------------------------
 * calendar gui
 * ------------------------------------------------------------------------ */
const Calendar = {
    cell_height: 20,
    the_entry_content: null,
    entry: null,
    click_start_hour: -1,
    click_entry: null,
    click_in_progress: false,

    day_names: [
        'Montag',
        'Dienstag',
        'Mittwoch',
        'Donnerstag',
        'Freitag',
        'Samstag',
        'Sonntag',
    ],

    /**
     * this function is called, whenever an existing entry in the
     * calendar is clicked. It calls the passed function with the
     * calculcate id of the clicked element
     *
     * @param  object  a function or a reference to a function
     * @param  object  the element in the dom, that has been clicked
     * @param  object  the click-event itself
     */
    clickEngine: function(func, target, event) {
        event.cancelBubble = true;
        var id = jQuery(target).parent()[0].id;
        id = id.substr(id.lastIndexOf('_') + 1);
        func(id);
    },

    /**
     * check, that the submited input-field cotains of a valid hour
     *
     * @param  object  the input-element to check
     */
    validateHour: function(element) {
        var hour = parseInt(jQuery(element).val(), 10);

        if (hour > 23) {
            hour = 23;
        }
        if (hour < 0 || isNaN(hour)) {
            hour = 0;
        }

        jQuery(element).val(hour);
    },

    /**
     * check, that the submited input-field cotains of a valid minute
     *
     * @param  object  the input-element to check
     */
    validateMinute: function(element) {
        var minute = parseInt(jQuery(element).val(), 10);

        if (minute > 59) {
            minute = 59;
        }
        if (minute < 0 || isNaN(minute)) {
            minute = 0;
        }

        jQuery(element).val(minute);
    },

    /**
     * checks if at least one day is selected
     *
     * @return: bool true if selected days > 0
     */
    validateNumberOfDays: function() {
        var days = $("input[name='days[]']:checked")
            .map(function() {
                return $(this).val();
            })
            .get();
        if (days.length === 0) {
            jQuery('.settings > span[class=invalid_message]').show();
            return false;
        } else {
            return true;
        }
    },

    /**
     * check, that the submitted input-fields contain a valid time-range
     *
     * @param  object  the input-element to check (start-hour)
     * @param  object  the input-element to check (start-minute)
     * @param  object  the input-element to check (end-hour)
     * @param  object  the input-element to check (end-minute)
     *
     * @return: bool true if valid time-range, false otherwise
     */
    checkTimeslot: function(start_hour, start_minute, end_hour, end_minute) {
        if (
            parseInt(start_hour.val(), 10) * 100 + parseInt(start_minute.val(), 10) >=
            parseInt(end_hour.val(), 10) * 100 + parseInt(end_minute.val(), 10)
        ) {
            return false;
        }

        return true;
    },

    parseDateFromString: function(date_string) {
        if (!date_string) {
            //Nothing that can be done.
            return null;
        }
        let string_parts = date_string.split(' ');
        if (string_parts.length !== 2) {
            //Invalid format.
            return null;
        }
        let date_parts = string_parts[0].split('.');
        if (date_parts.length !== 3) {
            //Invalid format.
            return null;
        }
        let time_parts = string_parts[1].split(':');
        if (time_parts.length !== 2) {
            //Invalid format.
            return null;
        }
        let date = new Date(
            parseInt(date_parts[2]),
            parseInt(date_parts[1]) - 1,
            parseInt(date_parts[0])
        );
        date.setHours(parseInt(time_parts[0]));
        date.setMinutes(parseInt(time_parts[1]));
        date.setSeconds(0);

        return date;
    }
};

export default Calendar;