<?php

/**
 * Kunena Component
 *
 * @package        Kunena.Framework
 *
 * @copyright      Copyright (C) 2008 - @currentyear@ Kunena Team. All rights reserved.
 * @license        https://www.gnu.org/copyleft/gpl.html GNU/GPL
 * @link           https://www.kunena.org
 **/

namespace Kunena\Forum\Libraries\Date;

\defined('_JEXEC') or die();

use DateTimeZone;
use Exception;
use Joomla\CMS\Date\Date;
use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Kunena\Forum\Libraries\Factory\KunenaFactory;
use Kunena\Forum\Libraries\Profiler\KunenaProfiler;

/**
 * Class KunenaDate
 *
 * @since   Kunena 6.0
 */
class KunenaDate extends Date
{
    /**
     * Return an instance of KunenaDate object
     *
     * @param   string  $date  String in a format accepted by strtotime(), defaults to "now".
     * @param   mixed   $tz    Time zone to be used for the date. Might be a string or a DateTimeZone object.
     *
     * @return  KunenaDate
     *
     * @since   Kunena 6.0
     */
    public static function getInstance($date = 'now', $tz = null): KunenaDate
    {
        return new self($date, $tz);
    }

    /**
     * @return  string
     *
     * @since   Kunena 6.0
     */
    public function toTimezone(): string
    {
        $timezone = $this->getOffsetFromGMT(true);

        return sprintf('%+d:%02d', $timezone, ($timezone * 60) % 60);
    }

    /**
     * @param   string  $mode    mode
     * @param   string  $title   title
     * @param   bool    $offset  offset
     * @param   string  $class   class
     *
     * @return  string
     *
     * @since   Kunena 6.0
     * @throws  Exception
     */
    public function toSpan($mode = 'datetime_today', $title = 'ago', $offset = false, $class = ''): string
    {
        return '<span class="kdate ' . $class . '" data-bs-toggle="tooltip" title="' . $this->toKunena($title, $offset) . '">' . $this->toKunena($mode, $offset) . '</span>';
    }

    /**
     * @param   string  $mode    mode
     * @param   bool    $offset  offset
     *
     * @return  string
     *
     * @since   Kunena 6.0
     * @throws  Exception
     */
    public function toKunena($mode = 'datetime_today', $offset = false): string
    {
        if ($this->format('Y') < 1902) {
            return Text::_('COM_KUNENA_LIB_DATETIME_UNKNOWN');
        }

        if (preg_match('/^config_/', $mode) == 1) {
            $option = substr($mode, 7);
            $mode   = KunenaFactory::getConfig()->$option;
        }

        $modearr    = explode('_', $mode);
        $dateformat = strtolower($modearr[0]);
        $time       = false;

        switch ($dateformat) {
            case 'none':
                return '';
            case 'ago':
                return $this->toTimeAgo();
            case 'time':
                $time            = true;
                $usertime_format = Text::_('COM_KUNENA_LIB_TIME_FMT');
                break;
            case 'date':
                $usertime_format = Text::_('COM_KUNENA_LIB_DATE_FMT');
                break;
            case 'datetime':
                $time            = true;
                $usertime_format = Text::_('COM_KUNENA_LIB_DATETIME_FMT');
                break;
            default:
                $usertime_format = $mode;
        }

        if (!$offset) {
            $app = Factory::getApplication();
            $my  = $app->getIdentity();

            if ($my->id) {
                $offset = $my->getParam('timezone', $app->get('offset', 'utc'));
            } else {
                $offset = $app->get('offset', 'utc');
            }
        }

        try {
            $offset = new DateTimeZone($offset);
            $this->setTimezone($offset);
        } catch (Exception $e) {
            trigger_error('Kunena: Timezone issue!');
        }

        // Today and Yesterday?
        if (end($modearr) == 'today') {
            $now = Factory::getDate('now');

            if ($offset) {
                $now->setTimezone($offset);
            }

            $now  = @getdate($now->toUnix());
            $then = @getdate($this->toUnix());

            // Same day of the year, same year.... Today!
            if (
                $then ['yday'] == $now ['yday']
                && $then ['year'] == $now ['year']
            ) {
                return trim(Text::sprintf('COM_KUNENA_LIB_DATE_TODAY', $time ? $this->format(Text::_('COM_KUNENA_LIB_TIME_FMT'), true) : ''));
            }

            // Day-of-year is one less and same year, or it's the first of the year and that's the last of the year...
            if (
                ($then ['yday'] == $now ['yday'] - 1 && $then ['year'] == $now ['year'])
                || ($now ['yday'] == 0 && $then ['year'] == $now ['year'] - 1) && $then ['mon'] == 12 && $then ['mday'] == 31
            ) {
                return trim(Text::sprintf('COM_KUNENA_LIB_DATE_YESTERDAY', $time ? $this->format(Text::_('COM_KUNENA_LIB_TIME_FMT'), true) : ''));
            }
        }

        return $this->format($usertime_format, true);
    }

    /**
     * @return  string
     *
     * @since   Kunena 6.0
     */
    public function toTimeAgo(): string
    {
        KunenaProfiler::getInstance() ? KunenaProfiler::instance()->start('function ' . __CLASS__ . '::' . __FUNCTION__ . '()') : null;
        $chunks = [
            'y' => [Text::_('COM_KUNENA_DATE_YEAR'), Text::_('COM_KUNENA_DATE_YEARS')],
            'm' => [Text::_('COM_KUNENA_DATE_MONTH'), Text::_('COM_KUNENA_DATE_MONTHS')],
            'w' => [Text::_('COM_KUNENA_DATE_WEEK'), Text::_('COM_KUNENA_DATE_WEEKS')],
            'd' => [Text::_('COM_KUNENA_DATE_DAY'), Text::_('COM_KUNENA_DATE_DAYS')],
            'h' => [Text::_('COM_KUNENA_DATE_HOUR'), Text::_('COM_KUNENA_DATE_HOURS')],
            'i' => [Text::_('COM_KUNENA_DATE_MINUTE'), Text::_('COM_KUNENA_DATE_MINUTES')], ];

        // We only want to output two chunks of time here, eg: "x years, xx months" or "x days, xx hours"
        $tick   = 0;
        $output = '';
        $diff   = $this->diff(new Date());

        foreach ($diff as $name => $count) {
            if ($name == 'd') {
                // Days are special case as we want to break it into weeks and days.
                $weeks = (int) ($count / 7);

                if ($weeks) {
                    $count  %= 7;
                    $output .= ($weeks == 1) ? " 1 {$chunks['w'][0]}" : " {$weeks} {$chunks['w'][1]}";

                    if (2 == ++$tick) {
                        break;
                    }
                }
            }

            if (!$count || !isset($chunks[$name])) {
                continue;
            }

            $output .= ($count == 1) ? " 1 {$chunks[$name][0]}" : " {$count} {$chunks[$name][1]}";

            if (2 == ++$tick) {
                break;
            }
        }

        if (!$output) {
            $output .= Text::_('COM_KUNENA_LIB_TIME_NOW');
        } else {
            $output = Text::sprintf('COM_KUNENA_LIB_TIME_AGO', trim($output));
        }

        KunenaProfiler::getInstance() ? KunenaProfiler::instance()->stop('function ' . __CLASS__ . '::' . __FUNCTION__ . '()') : null;

        return $output;
    }
}