<?php

/**
 * @file
 * Provides a datepicker for the "Authored on" date field found on node forms.
 */

/**
 * Implements hook_help().
 */
function date_popup_authored_help($section) {
  switch ($section) {
    case 'admin/help#date_popup_authored':
      $readme = '<p>' . t('Date Popup Authored provides a jQuery UI datepicker for the "Authored on" date field found on node forms.') . '</p>';
      $readme .= '<p>' . t('Please note that the Drupal 7 branch is experimental and relies on non-stable code. A stable version of Date Popup Authored will be released in conjunction with the stable releases of both Drupal 7 and Date for Drupal 7.') . '</p>';
      $readme .= '<p>' . t('For a full description of the module, visit <a href="@url">the project page</a>.',
        array(
          '@url' => url('http://drupal.org/project/date_popup_authored'),
        )) . '</p>';
      $readme .= '<p>' . t('To submit bug reports and feature suggestions, or to track changes, visit <a href="@url">the issue queue</a>.',
        array(
          '@url' => url('http://drupal.org/project/issues/date_popup_authored'),
        )) . '</p>';

      $readme .= '<h2>' . t('Requirements') . '</h2>';
      $readme .= '<ul>';
      $readme .= '<li>' . t('Drupal 7') . '</li>';
      $readme .= '<li>' . t('<a href="@url">Date</a> 7.x-1.0-alpha2 or later',
        array(
          '@url' => url('http://http://drupal.org/project/date'),
        )) . '</li>';
      $readme .= '<li>' . t('<em>Date popup</em>, part of the Date module') . '</li>';
      $readme .= '</ul>';

      $readme .= '<h2>' . t('Installation and Configuration') . '</h2>';
      $readme .= '<p>' . t('Install as usual. See the <a href="@url">handbook page on installing contributed modules</a> for further information.',
        array(
          '@url' => url('http://drupal.org/node/895232'),
        )) . '</p>';
      $readme .= '<p>' . t('You can change the behavior of the datepicker by going to <a href="@url">the settings page for each content type</a>.',
        array(
          '@url' => url('admin/structure/types'),
        )) . '</p>';

      $readme .= '<h2>' . t('Contact') . '</h2>';
      $readme .= '<p>' . t('The current maintainer is Mark Trapp. You can contact him through his <a href="@url">Drupal user page</a>.',
        array(
          '@url' => url('http://drupal.org/user/212019'),
        )) . '</p>';

      $readme .= '<h2>' . t('Acknowledgements') . '</h2>';
      $readme .= '<p> ' . t('Date Popup Authored was inspired by the hacks provided by <a href="@url-brice">brice</a> and <a href="@url-robloach">Rob Loach</a> in <a href="@url-issue">issue #471942</a>. It contains additional fixes to account for problems found in their solution as well as new configuration options.',
        array(
          '@url-brice' => url('http://drupal.org/user/446296'),
          '@url-robloach' => url('http://drupal.org/user/61114'),
          '@url-issue' => url('http://drupal.org/node/471942'),
        )) . '</p>';

      return $readme;
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 *
 * Adds additional configuration settings to the form for each content type to
 * control the behavior of the datepicker.
 */
function date_popup_authored_form_node_type_form_alter(&$form, &$form_state, $form_id) {
  $form['additional_settings']['#attached']['js'][] = drupal_get_path('module', 'date_popup_authored') . '/date_popup_authored-node-form.js';

  $form['date_popup_authored'] = array(
    '#type' => 'fieldset',
    '#title' => t('Date Popup Authored settings'),
    '#collapsible' => TRUE,
    '#group' => 'additional_settings',
  );
  $form['date_popup_authored']['date_popup_authored_enabled'] = array(
    '#type' => 'checkbox',
    '#title' => t('Enable datepicker for authored on date.'),
    '#description' => t('The default Authored On field will be replaced with a JavaScript datepicker.'),
    '#default_value' => variable_get('date_popup_authored_enabled_' . $form['#node_type']->type, 1),
  );
  $form['date_popup_authored']['date_popup_authored_format'] = array(
    '#type' => 'select',
    '#title' => t('Date format'),
    '#description' => t('Custom date formats can be added on the <a href="@url">date and time formats page</a>.', array('@url' => url('admin/config/regional/date-time'))),
    '#default_value' => variable_get('date_popup_authored_format_' . $form['#node_type']->type, 'm/d/Y - H:i'),
    '#options' => _date_popup_authored_format_options(),
    '#states' => array(
      'invisible' => array(
        'input[name="date_popup_authored_enabled"]' => array('checked' => FALSE),
      ),
    ),
  );
  $form['date_popup_authored']['date_popup_authored_year_range'] = array(
    '#type' => 'textfield',
    '#title' => t('Year range'),
    '#description' => t('The range of years to provide to the user. Default is &#x00B1;3 years, i.e. 2007-2013'),
    '#default_value' => variable_get('date_popup_authored_year_range_' . $form['#node_type']->type, 3),
    '#size' => 3,
    '#field_prefix' => '&#x00B1;',
    '#field_suffix' => 'years',
    '#states' => array(
      'invisible' => array(
        'input[name="date_popup_authored_enabled"]' => array('checked' => FALSE),
      ),
    ),
  );
}

/**
 * Implements hook_form_BASE_FORM_ID_alter() for node_form.
 *
 * Replaces default Authored on field with a datepicker on node submission forms.
 */
function date_popup_authored_form_node_form_alter(&$form, $form_state, $form_id) {
  // Date Popup Authored should modify the node submission form only if the
  // user is allowed to modify the authoring information and it's enabled.
  if (!($form['author']['#access'] && variable_get('date_popup_authored_enabled_' . $form['type']['#value'], 1))) {
    return;
  }

  $form['author']['date']['#type'] = 'date_popup';

  // If there is a date already available, rewrite it to conform to
  // Date Popup's expected format.
  if (!empty($form['author']['date']['#default_value'])) {
    $date = new DateObject($form['author']['date']['#default_value'], NULL, 'Y-m-d H:i:s O');
    $form['author']['date']['#default_value'] = $date->format('Y-m-d H:i:s');
  }

  // Set options specific to date_popup.
  $year_range = variable_get('date_popup_authored_year_range_' . $form['type']['#value'], 3);
  $form['author']['date']['#date_year_range'] = '-' . $year_range . ':+' . $year_range;
  $form['author']['date']['#date_format'] = variable_get('date_popup_authored_format_' . $form['type']['#value'], variable_get('date_format_short', 'm/d/Y - H:i'));

  // Unset options that are not relevant to date_popup
  unset($form['author']['date']['#maxlength']);
  unset($form['author']['date']['#description']);

  // Add an additional validate handler after date_popup builds the element.
  $form['author']['date']['#after_build'][] = 'date_popup_authored_element_after_build';

  // We need to modify date popup's data during submit
  // @see http://drupal.org/node/847854
  $form['#submit'][] = 'date_popup_authored_node_form_submit';
}

/**
 * Implements hook_node_type_delete().
 */
function date_popup_authored_node_type_delete($info) {
  // Delete format configuration when node types are deleted.
  variable_del('date_popup_authored_enabled_' . $info->type);
  variable_del('date_popup_authored_format_' . $info->type);
  variable_del('date_popup_authored_year_range_' . $info->type);
}

/**
 * Form after build handler for the date popup element.
 */
function date_popup_authored_element_after_build($element, &$form_state) {
  // Add a validate handler after the one that is added by date_popup.
  $element['#element_validate'][] = 'date_popup_authored_element_validate';
  return $element;
}

/**
 * Validate handler for the date popup element.
 */
function date_popup_authored_element_validate($element, &$form_state) {
  if (date_hidden_element($element) || is_string($element['#value'])) {
    return;
  }

  // If an error occurred in the validation of the date popup field the date
  // cannot be correctly rendered as a string. In this case clear the date value
  // to avoid subsequent errors when the node is validated.
  // @see date_popup_validate()
  // @see node_validate()
  $input_exists = NULL;
  $input = drupal_array_get_nested_value($form_state['values'], $element['#parents'], $input_exists);
  $date = date_popup_input_date($element, $input);
  if (is_object($date) && !empty($date->errors)) {
    $form_state['values']['date'] = NULL;
  }
}

/**
 * Submits the node data with the proper post date.
 *
 * @see http://drupal.org/node/847854
 */
function date_popup_authored_node_form_submit($form, &$form_state) {
  if (isset($form_state['values']['date']) && $form_state['values']['date'] instanceof DateObject) {
    $form_state['values']['date'] = $form_state['values']['date']->format('Y-m-d H:i:s O');
  }
}

/**
 * Provides an options list of date formats for the configuration form.
 */
function _date_popup_authored_format_options() {
  $options = array();

  $date = new DateObject('now', date_default_timezone());
  $date_formats = system_get_date_formats();

  foreach ($date_formats as $type => $format_info) {
    $format_key = ucwords($type) . ' date format';

    $options[$format_key] = array();

    foreach (array_keys($format_info) as $format) {
      $options[$format_key][$format] = $date->format($format);
    }
  }

  return $options;
}