<?php

/**
 * This class can help you find out just how much time has passed between two dates.
 * It has two functions you can call:
 * - `inWords()` which gives you the "time ago in words" between two dates.
 * - `dateDifference()` which returns an array of years, months, days, hours, minutes and seconds between the two dates.
 *
 * @package NamelessMC\Core
 * @author jimmiw
 * @author Samerton
 * @version 2.0.0-pr8
 * @license MIT
 * @site http://github.com/jimmiw/php-time-ago
 */
class TimeAgo
{
    // defines the number of seconds per "unit"
    private int $_secondsPerMinute = 60;
    private int $_secondsPerHour = 3600;
    private int $_secondsPerDay = 86400;
    private int $_secondsPerMonth = 2592000;
    private int $_secondsPerYear = 31104000;
    private string $_timezone;

    public function __construct(string $timezone)
    {
        $this->_timezone = $timezone;
    }

    /**
     * @param  string|int $past     Past time
     * @param  Language   $language
     * @return string     Time ago string
     */
    public function inWords($past, Language $language): string
    {
        // sets the default timezone
        date_default_timezone_set($this->_timezone);
        if (!is_numeric($past)) {
            $past = strtotime($past);
        }
        $now = time();

        // finds the time difference
        $timeDifference = $now - $past;

        // less than 29secs
        if ($timeDifference <= 29) {
            $key = 'less_than_a_minute';
        } elseif ($timeDifference <= 89) {
            // more than 29secs and less than 1min29secss
            $key = '1_minute';
        } elseif ($timeDifference <= (($this->_secondsPerMinute * 44) + 29)) {
            // between 1min30secs and 44mins29secs
            $replace = floor($timeDifference / $this->_secondsPerMinute);
            $key = '_minutes';
        } elseif (
            $timeDifference > (($this->_secondsPerMinute * 44) + 29)
            &&
            $timeDifference < (($this->_secondsPerMinute * 89) + 29)
        ) {
            // between 44mins30secs and 1hour29mins29secs
            $key = 'about_1_hour';
        } elseif (
            $timeDifference > (
                ($this->_secondsPerMinute * 89) +
                29
            )
            &&
            $timeDifference <= (
                ($this->_secondsPerHour * 23) +
                ($this->_secondsPerMinute * 59) +
                29
            )
        ) {
            // between 1hour29mins30secs and 23hours59mins29secs
            $replace = floor($timeDifference / $this->_secondsPerHour);
            if ($replace == 1) {
                $key = 'about_1_hour';
                unset($replace);
            } else {
                $key = '_hours';
            }
        } elseif (
            $timeDifference > (
                ($this->_secondsPerHour * 23) +
                ($this->_secondsPerMinute * 59) +
                29
            )
            &&
            $timeDifference <= (
                ($this->_secondsPerHour * 47) +
                ($this->_secondsPerMinute * 59) +
                29
            )
        ) {
            // between 23hours59mins30secs and 47hours59mins29sec
            $key = '1_day';
        } elseif (
            $timeDifference > (
                ($this->_secondsPerHour * 47) +
                ($this->_secondsPerMinute * 59) +
                29
            )
            &&
            $timeDifference <= (
                ($this->_secondsPerDay * 29) +
                ($this->_secondsPerHour * 23) +
                ($this->_secondsPerMinute * 59) +
                29
            )
        ) {
            // between 47hours59mins30secs and 29days23hours59mins29secs
            $replace = floor($timeDifference / $this->_secondsPerDay);
            $key = '_days';
        } elseif (
            $timeDifference > (
                ($this->_secondsPerDay * 29) +
                ($this->_secondsPerHour * 23) +
                ($this->_secondsPerMinute * 59) +
                29
            )
            &&
            $timeDifference <= (
                ($this->_secondsPerDay * 59) +
                ($this->_secondsPerHour * 23) +
                ($this->_secondsPerMinute * 59) +
                29
            )
        ) {
            // between 29days23hours59mins30secs and 59days23hours59mins29secs
            $key = 'about_1_month';
        } elseif (
            $timeDifference > (
                ($this->_secondsPerDay * 59) +
                ($this->_secondsPerHour * 23) +
                ($this->_secondsPerMinute * 59) +
                29
            )
            &&
            $timeDifference < $this->_secondsPerYear
        ) {
            // between 59days23hours59mins30secs and 1year (minus 1sec)
            $replace = round($timeDifference / $this->_secondsPerMonth);
            // if months is 1, then set it to 2, because we are "past" 1 month
            if ($replace == 1) {
                $replace = 2;
            }

            $key = '_months';
        } elseif (
            $timeDifference >= $this->_secondsPerYear
            &&
            $timeDifference < ($this->_secondsPerYear * 2)
        ) {
            // between 1year and 2years (minus 1sec)
            $key = 'about_1_year';
        } else {
            // 2years or more
            $replace = floor($timeDifference / $this->_secondsPerYear);
            $key = 'over_x_years';
        }

        $term = $language->get('time', $key);

        if (count($exploded = explode('|', $term)) > 1) {
            if (!isset($replace)) {
                return 'Plural specified but replace not set for ' . Output::getClean($key);
            }

            $pluralForm = $language->getPluralForm();
            if ($pluralForm === null) {
                return 'Plural form function not defined';
            }

            return str_replace('{{count}}', $replace, $pluralForm($replace, $exploded));
        }

        if (isset($replace)) {
            return $language->get('time', $key, ['count' => $replace]);
        }

        return $term;
    }

    public function dateDifference(string $past, string $now = 'now'): array
    {
        // initializes the placeholders for the different "times"
        $seconds = 0;
        $minutes = 0;
        $hours = 0;
        $days = 0;
        $months = 0;
        $years = 0;

        // sets the default timezone
        date_default_timezone_set($this->_timezone);

        // finds the past in datetime
        $past = strtotime($past);
        // finds the current datetime
        $now = strtotime($now);

        // calculates the difference
        $timeDifference = $now - $past;

        // starts determining the time difference
        if ($timeDifference >= 0) {
            switch ($timeDifference) {
                // finds the number of years
                case $timeDifference >= $this->_secondsPerYear:
                    // uses floor to remove decimals
                    $years = floor($timeDifference / $this->_secondsPerYear);
                    // saves the amount of seconds left
                    $timeDifference -= ($years * $this->_secondsPerYear);
                    break;

                    // finds the number of months
                case $timeDifference >= $this->_secondsPerMonth && $timeDifference <= ($this->_secondsPerYear - 1):
                    // uses floor to remove decimals
                    $months = floor($timeDifference / $this->_secondsPerMonth);
                    // saves the amount of seconds left
                    $timeDifference -= ($months * $this->_secondsPerMonth);
                    break;

                    // finds the number of days
                case $timeDifference >= $this->_secondsPerDay && $timeDifference <= ($this->_secondsPerYear - 1):
                    // uses floor to remove decimals
                    $days = floor($timeDifference / $this->_secondsPerDay);
                    // saves the amount of seconds left
                    $timeDifference -= ($days * $this->_secondsPerDay);
                    break;

                    // finds the number of hours
                case $timeDifference >= $this->_secondsPerHour && $timeDifference <= ($this->_secondsPerDay - 1):
                    // uses floor to remove decimals
                    $hours = floor($timeDifference / $this->_secondsPerHour);
                    // saves the amount of seconds left
                    $timeDifference -= ($hours * $this->_secondsPerHour);
                    break;

                    // finds the number of minutes
                case $timeDifference >= $this->_secondsPerMinute && $timeDifference <= ($this->_secondsPerHour - 1):
                    // uses floor to remove decimals
                    $minutes = floor($timeDifference / $this->_secondsPerMinute);
                    // saves the amount of seconds left
                    $timeDifference -= ($minutes * $this->_secondsPerMinute);
                    break;

                    // finds the number of seconds
                case $timeDifference <= ($this->_secondsPerMinute - 1):
                    // seconds is just what there is in the timeDifference variable
                    $seconds = $timeDifference;
            }
        }

        return [
            'years' => $years,
            'months' => $months,
            'days' => $days,
            'hours' => $hours,
            'minutes' => $minutes,
            'seconds' => $seconds,
        ];
    }
}