<?php
include_once('reldate.features.inc');

/**
 * Implementation of hook_views_api().
 */
function reldate_views_api() {
  return array('api' => 2);
}

/**
 * Implementations of hook_date_format_types().
 */
function reldate_date_format_types() {
  return array(
    'day' => t('Day'),
    'time' => t('Time'),
    'month_within' => t('Within current month'),
    'month_after' => t('After current month'),
  );
}

/**
 * Implementation of hook_date_formats().
 */
function reldate_date_formats() {
  $condensed = array(
    'day' => array('l, M j', 'l, j M'),
    'time' => array('g:ia', 'H:i'),
    'month_within' => array('g:ia D M j', 'H:i D M j', 'g:ia D j M', 'H:i D j M'),
    'month_after' => array('g:ia M j, Y', 'H:i M j, Y', 'g:ia j M, Y', 'H:i j M, Y'),
  );
  $formats = array();
  foreach ($condensed as $type => $f) {
    foreach ($f as $format) {
      $formats[] = array(
        'type' => $type,
        'format' => $format,
        'locales' => array(),
      );
    }
  }
  return $formats;
}

/**
 * Custom date formatter that provides the most easily understood date format
 * given the date's proximity to the current time.
 */
function reldate_format_date($timestamp) {
  static $slots, $formats;
  // Static cache formats, slots. These aren't expensive calls, but when we
  // are called many times on a page load it becomes costly to repeat this logic.
  if (!isset($slots)) {
    $now = time();
    $slots = array(
      'today' => format_date($now, 'custom', 'MjY'),
      'yesterday' => format_date($now - (24*60*60), 'custom', 'MjY'),
      'month_within' => $now - 3600 * 24 * 30,
    );
    $formats = array(
      'time' => variable_get('date_format_time', 'g:ia'),
      'month_within' => variable_get('date_format_month_within', 'g:ia D M j'),
      'month_after' => variable_get('date_format_month_after', 'g:ia M j, Y'),
    );
  }
  $day = format_date($timestamp, 'custom', 'MjY');
  if ($day == $slots['today']) {
    return t('!time Today', array('!time' => format_date($timestamp, 'custom', $formats['time'])));
  }
  else if ($day == $slots['yesterday']) {
    return t('!time Yesterday', array('!time' => format_date($timestamp, 'custom', $formats['time'])));
  }
  else if ($timestamp > $slots['month_within'] ) {
    return format_date($timestamp, 'custom', $formats['month_within']);
  }
  else {
    return format_date($timestamp, 'custom', $formats['month_after']);
  }
}