'use strict';

import * as sol from "../../solight/sol.js";


const nowString = 'Now';

const absStartingString = 'Starting ';
const absStartedString = 'Since ';
const absEndingString = 'Until ';
const absEndedString = 'Ended ';

const relStartingString = 'Starts ';
const relStartedString = 'Started ';
const relEndingString = 'Ends ';
const relEndedString = 'Ended ';

const fuzzyMinutes = 1;

const nowish_interval = (time) =>
      luxon.Interval.fromDateTimes(time.minus({minutes: fuzzyMinutes}), time.plus({minutes: fuzzyMinutes}));

const time_relative_string = (then, now) =>
      then.setLocale('en').toRelative({base: now, unit: 'minutes'});

const start_relative_praefix_string = (event, time) =>
      sol.isFutureEvent(event, time) ? relStartingString : relStartedString;

const end_relative_praefix_string = (event, time) =>
      sol.isPastEvent(event, time) ? relEndedString : relEndingString;

const event_relative_start_time_string = (event, time) => {
    const esd = sol.eventStartDate(event);
    const startString = start_relative_praefix_string(event, time);
    return startString.concat(time_relative_string(esd, time));
};

const event_relative_end_time_string = (event, time) => {
    const eed = sol.eventEndDate(event);
    const endString = end_relative_praefix_string(event, time);
    return endString.concat(time_relative_string(eed, time));
};

const event_relative_fuzzy_start_time_string = (event, time) => {
    const esd = sol.eventStartDate(event);
    const startString = start_relative_praefix_string(event, time);
    return nowish_interval(esd).contains(time) ?
        nowString :
        startString.concat(time_relative_string(esd, time));
};

const event_relative_fuzzy_end_time_string = (event, time) => {
    const eed = sol.eventEndDate(event);
    const endString = end_relative_praefix_string(event, time);
    return nowish_interval(eed).contains(time) ?
        nowString :
        endString.concat(time_relative_string(eed, time));
};


const time_absolute_string = (time) =>
      time.setLocale('en').toLocaleString({hour: '2-digit', minute: '2-digit', hourCycle: 'h23'});

const start_absolute_praefix_string = (event, time) =>
      sol.isFutureEvent(event, time) ? absStartingString : absStartedString;

const end_absolute_praefix_string = (event, time) =>
      sol.isPastEvent(event, time) ? absEndedString : absEndingString;

const event_absolute_start_time_string = (event, time) => {
    const esd = sol.eventStartDate(event);
    const startString = start_absolute_praefix_string(event, time);
    return startString.concat(time_absolute_string(esd));
};

const event_absolute_end_time_string = (event, time) => {
    const eed = sol.eventEndDate(event);
    const endString = end_absolute_praefix_string(event, time);
    return endString.concat(time_absolute_string(eed));
};

const event_absolute_fuzzy_start_time_string = (event, time) => {
    const esd = sol.eventStartDate(event);
    const startString = start_absolute_praefix_string(event, time);
    return nowish_interval(esd).contains(time) ?
        nowString :
        startString.concat(time_absolute_string(esd));
};

const event_absolute_fuzzy_end_time_string = (event, time) => {
    const eed = sol.eventEndDate(event);
    const endString = end_absolute_praefix_string(event, time);
    return nowish_interval(eed).contains(time) ?
        nowString :
        endString.concat(time_absolute_string(eed));
};


export {
    event_relative_start_time_string,
    event_relative_end_time_string,
    event_relative_fuzzy_start_time_string,
    event_relative_fuzzy_end_time_string,
    event_absolute_start_time_string,
    event_absolute_end_time_string,
    event_absolute_fuzzy_start_time_string,
    event_absolute_fuzzy_end_time_string
}