<?php

/**
 * @file
 * Provides a user interface for Subscriptions.
 */

/**
 * Implementation of hook_nodeapi().
 *
 * Inject the node subform into node pages (depending on the Display Settings).
 *
 * @ingroup hooks
 * @ingroup form
 */
function subscriptions_ui_nodeapi(&$node, $op, $teaser) {
  global $user;
  if ($op == 'view' && $node->nid && !$teaser && subscriptions_ui_can_subscribe()) {
    $op2 = subscriptions_arg(2);
    if (!variable_get('subscriptions_form_in_block', 0) &&
        (!variable_get('subscriptions_form_link_only', 0) && (!$op2 || $op2 == 'view') ||
          variable_get('subscriptions_form_link_only', 0) && $op2 == 'subscribe' )) {
      if ($form = drupal_get_form('subscriptions_ui_node_form', $node)) {
        $node->content['subscriptions_ui'] = array(
          '#value' => $form,
          '#weight' => 100,
        );
      }
    }
  }
}

/**
 * Implementation of hook_block().
 *
 * Define the Subscriptions Interface block for node pages (depending on the Display Settings).
 *
 * @ingroup hooks
 */
function subscriptions_ui_block($op = 'list', $delta = 0) {
  switch ($op) {
    case 'list':
      $blocks[0]['info'] = t('Subscriptions interface');
      $blocks[0]['cache'] = BLOCK_CACHE_PER_PAGE;
      $blocks[0]['region'] = 'content';
      return $blocks;
    case 'view':
      $op2 = subscriptions_arg(2);
      if (subscriptions_ui_can_subscribe() && variable_get('subscriptions_form_in_block', 0) &&
          (!variable_get('subscriptions_form_link_only', 0) && (!$op2 || $op2 == 'view') ||
            variable_get('subscriptions_form_link_only', 0) && $op2 == 'subscribe' )) {
        return array(
          'subject' => t('Subscriptions'),
          'content' => drupal_get_form('subscriptions_ui_node_form', menu_get_object()),
        );
      }
  }
}


/**
 * Returns TRUE on node/NID pages if the NID is not blocked
 * and no other module wants to provide the UI.
 */
function subscriptions_ui_can_subscribe() {
  global $user;

  $arg1 = subscriptions_arg(1, 'nid');
  return ($user->uid && subscriptions_arg(0) == 'node' && is_numeric($arg1) && module_invoke('subscriptions_ui', 'get_permission_to_handle', $arg1, 'subscriptions_ui') !== FALSE);
}

/**
 * Implementation of hook_link().
 *
 * Add a Subscribe link to node pages (depending on the Display Settings).
 *
 * @ingroup hooks
 */
function subscriptions_ui_link($type, $node = NULL, $teaser = NULL) {
  global $user;
  
  if ($type == 'node' && subscriptions_ui_can_subscribe() && empty($teaser)) {
    subscriptions_suspended($user->uid, TRUE);
    $arg2 = subscriptions_arg(2);
    if (variable_get('subscriptions_form_link_only', 0) && $arg2 != 'subscribe' && (!variable_get('subscriptions_avoid_empty_subscribe_links', 0) || module_invoke_all('subscriptions', 'node_options', $user, $node))) {
      $blocked_types = variable_get('subscriptions_blocked_content_types', array());
      if (in_array($node->type, $blocked_types) && !user_access('subscribe to all content types')) {
        return;
      }
      return array('subscriptions-subscribe' => array(
        'href' => $_GET['q'] .'/subscribe',
        'title' => t('Subscribe') . (in_array($node->type, $blocked_types) ? SUBSCRIPTIONS_UNAVAILABLE : ''),
        'html' => TRUE,
        'fragment' => 'subscribe',
        'attributes' => array('title' => t('Receive notifications about changes and/or comments to this page (and possibly similar pages).')),
      ));
    }
    elseif (variable_get('subscriptions_form_in_block', 0) && $arg2 == 'subscribe') {
      // Make sure the block is visible
      global $theme;
      if (!isset($theme)) {
        init_theme();
      }
      $regions = system_region_list($theme);
      foreach (array_keys($regions) as $region) {
        $blocks = block_list($region);
        foreach (array_keys($blocks) as $block) {
          if ($block == 'subscriptions_ui_0') {
            $subscriptions_ui_block_visible = TRUE;
          }
        }
      }
      if (empty($subscriptions_ui_block_visible)) {
        drupal_set_message(t('Enable the !module block <!link_tag_begin>here<!link_tag_end>!', array('!module' => 'Subscriptions', '!link_tag_begin' => 'a href="'. url('admin/build/block') .'"', '!link_tag_end' => '/a')), 'error');
      }
    }
  }
}

/**
 * Returns the form definition for the node subform.
 *
 * @param $node
 *   Must be a valid node object.
 * @param $account
 *   If not given, will be populated with current user (either anonymous).
 *
 * @ingroup form
 * @ingroup hooks
 */
function subscriptions_ui_node_form(&$form_state, $node, $account = NULL) {
  global $user;
  if (!isset($account)) {
    $account = $user;
  }

  if (subscriptions_node_is_blocked($node->nid)) {
    return;
  }

  $blocked_types = variable_get('subscriptions_blocked_content_types', array());
  if (in_array($node->type, $blocked_types)) {
    if (!user_access('subscribe to all content types', $account)) {
      return;
    }
    $is_blocked = TRUE;
  }

  init_theme();  // just in case, before calling theme_get_setting()
  $show_node_info = theme_get_setting('toggle_node_info_'. $node->type);
  $node_options = module_invoke_all('subscriptions', 'node_options', $account, $node);

  // Allow other modules to alter the node options.
  drupal_alter('subscriptions_node_options', $node_options);

  if (!$node_options || !user_access('subscribe to content', $account)) {
    return array();
  }
  uasort($node_options, '_subscriptions_cmp_by_weight');

  foreach (array(
    db_query("SELECT sid, module, field, value, author_uid, send_interval, send_updates, send_comments FROM {subscriptions} WHERE module = 'node' AND field = 'nid' AND value = '%s' AND recipient_uid = %d", $node->nid, $account->uid),
    db_query("SELECT sid, module, field, value, author_uid, send_interval, send_updates, send_comments FROM {subscriptions} WHERE module = 'node' AND field <> 'nid' AND recipient_uid = %d", $account->uid),
  ) as $result) {
    while ($s = db_fetch_array($result)) {
      $subscriptions[$s['field']][$s['value']][$s['author_uid']] = $s;
    }
  }
  // Process all options building the array of indexed params for each
  $nonlabeled_options = $options = $params = $default_comments = $default_updates = $default_subscriptions = array();
  $index = 1; // If we start with zero, get some value sent as 0 => 0
  foreach ($node_options as $field => $field_options) {
    foreach ($field_options as $option) {
      if (!is_array($option)) {
        continue;
      }
      if ((!$show_node_info || !variable_get('subscriptions_show_by_author_options', 1)) && isset($option['params']['author_uid']) && $option['params']['author_uid'] >= 0) {
        continue;
      }
      if ($option['params']['module'] == 'node' && $option['params']['field'] == 'type' && !empty($is_blocked)) {
        $option['name'] .= '&nbsp;'. SUBSCRIPTIONS_UNAVAILABLE;
      }
      //$options[$index] = (isset($option['link']) ? l($option['name'], 'subscriptions/add/'. $option['link'], array('query' => drupal_get_destination(), 'html' => TRUE)) : $option['name']);
      $options[$index] = $option['name'];
      $nonlabeled_options[$index] = '';
      $params[$index] = $param = $option['params'] + array('author_uid' => -1);
      if (isset($subscriptions[$param['field']][$param['value']][$param['author_uid']])) {
        $default_subscriptions[] = $index;
        $default_send_intervals[$index] = $subscriptions[$param['field']][$param['value']][$param['author_uid']]['send_interval'];
        if ($subscriptions[$param['field']][$param['value']][$param['author_uid']]['send_comments']) {
          $default_comments[] = $index;
        }
        if ($subscriptions[$param['field']][$param['value']][$param['author_uid']]['send_updates']) {
          $default_updates[] = $index;
        }
      }
      else {
        $default_send_intervals[$index] = _subscriptions_get_setting('send_interval', $account);
        if (_subscriptions_get_setting('send_comments', $account))
          $default_comments[] = $index;
        if (_subscriptions_get_setting('send_updates', $account))
          $default_updates[] = $index;
      }
      $index++;
    }
  }

  $form['params'] = array('#type' => 'value', '#value' => $params);

  $form['wrapper'] = array(
    '#type' => 'fieldset',
    '#title' => t('Subscribe') . (!empty($is_blocked) ? '&nbsp;'. SUBSCRIPTIONS_UNAVAILABLE : ''),
    '#collapsible' => TRUE,
    '#collapsed' => !variable_get('subscriptions_form_expanded', 0),
    '#theme' => 'subscriptions_ui_table',
    '#attributes' => array('id' => 'subscribe'),
  );
  $form['wrapper']['subscriptions'] = array(
    '#type' => 'checkboxes',
    '#default_value' => $default_subscriptions,
    '#options' => $options,
    '#access' => TRUE,
  );
  $form['wrapper']['updates'] = array(
    '#type' => 'checkboxes',
    '#default_value' => $default_updates,
    '#options' => $nonlabeled_options,
    '#access' => _subscriptions_get_setting('send_updates_visible', $user) > 0,
  );
  if (module_exists('comment') && user_access('access comments')) {
    $form['wrapper']['comments'] = array(
      '#type' => 'checkboxes',
      '#default_value' => $default_comments,
      '#options' => $nonlabeled_options,
      '#access' => _subscriptions_get_setting('send_comments_visible', $user) > 0,
    );
  }
  $form['wrapper']['footer'] = array(
    '#type' => 'item',
    '#description' => t('The master checkboxes on the left turn the given subscription on or off. Depending on the setup of the site, you may have additional options for active subscriptions.'),
    '#weight' => 9,
  );
  $form['wrapper']['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Save'),
    '#weight' => 10,
  );
  $form['account'] = array('#type' => 'value', '#value' => $account);
  $form['send_intervals'] = array('#type' => 'value', '#value' => $default_send_intervals);
  return $form;
}

/**
 * Implementation of hook_theme().
 */
function subscriptions_ui_theme() {
  return array(
    'subscriptions_ui_table' => array(
      'arguments' => array('element'),
    )
  );
}

/**
 * Theme subscriptions node subform table.
 *
 * @ingroup themeable
 */
function theme_subscriptions_ui_table($element) {
  $rows = array();
  $headers = array();
  $header_strings = array(
    array('class' => 'subscriptions-table', 'width' => '30%'),
    array('data'  => t('On&nbsp;updates'), 'width' => '1*', 'style' => 'writing-mode: lr-tb'),
    array('data'  => t('On&nbsp;comments'))
  );
  foreach (element_children($element['subscriptions']) as $key) {
    $row = array();
    foreach (array('subscriptions', 'updates', 'comments') as $eli => $elv) {
      if (isset($element[$elv]) && $element[$elv]['#access']) {
        $row[] = drupal_render($element[$elv][$key]);
        $headers[$eli] = $header_strings[$eli];
      }
    }
    $rows[] = $row;
  }
  unset($headers[end(array_keys($headers))]['width']);
  $output = theme('table', $headers, $rows);
  $output .= drupal_render($element);
  drupal_add_js(drupal_get_path('module', 'subscriptions') .'/subscriptions_tableselect.js', 'module');
  return $output;
}

/**
 * Node subscriptions node subform submit handler.
 *
 * @ingroup form
 */
function subscriptions_ui_node_form_submit($form, &$form_state) {

  $recipient_uid = $form_state['values']['account']->uid;
  $default_send_intervals = $form_state['values']['send_intervals'];

  foreach ($form_state['values']['subscriptions'] as $index => $value) {
    $params = $form_state['values']['params'][$index];
    $args = array($params['module'], $params['field'], $params['value'], $params['author_uid'], $recipient_uid);
    if ($value) {
      $args[] = $default_send_intervals[$index];
      $args[] = !empty($form_state['values']['updates'][$index]);
      $args[] = !empty($form_state['values']['comments'][$index]);
      call_user_func_array('subscriptions_write_subscription', $args);
    }
    else {
      db_query("DELETE FROM {subscriptions} WHERE module = '%s' AND field = '%s' AND value = '%s' AND author_uid = %d AND recipient_uid = %d", $args);
    }
  }
  $form_state['redirect'] = str_replace('/subscribe', '', $_GET['q']);
}

/**
 * Implementation of hook form_alter().
 *
 * Adds the Display Settings part to the admin/settings/subscriptions form.
 *
 * @ingroup hooks
 * @ingroup form
 */
function subscriptions_ui_form_subscriptions_settings_form_alter(&$form, &$form_state) {
  global $user;
  $tr = 't';

  $form['display_settings'] = array(
      '#type' => 'fieldset',
      '#title' => t('Display settings'),
      '#collapsible' => TRUE,
      '#weight' => -4,
  );
  $form['display_settings']['subscriptions_form_in_block'] = array(
    '#type'          => 'radios',
    '#title'         => t('Node form position'),
    '#options'       => array(
                          t('Fieldset above node links (and comments)'),  // 0
                          t('Fieldset in %block block (below the comments)', array('%block' => t('Subscriptions interface'))), // 1
                        ),
    '#default_value' => variable_get('subscriptions_form_in_block', 0),
    '#description'   => t('How to display the subscriptions sub-form on node pages.  Default is the first option.<br />To use the block, <b>you must enable the block</b> !here; put it into the %content region and set the %block_title to !none.', array('!here' => l(t('here'), 'admin/build/block'), '%content' => 'content', '%block_title' => $tr('Block title'), '!none' => '<em>&lt;none&gt;</em>')),
  );
  $form['display_settings']['subscriptions_form_link_only'] = array(
    '#type'          => 'radios',
    '#title'         => t('Node form visibility'),
    '#options'       => array(
                          t('Always display the fieldset'),  // 0
                          t('Display only a @subscribe link that makes the fieldset visible', array('@subscribe' => t('Subscribe'))), // 1
                        ),
    '#default_value' => variable_get('subscriptions_form_link_only', 0),
    '#description'   => t('What to display.  Default is the first option.'),
  );
  $form['display_settings']['subscriptions_form_expanded'] = array(
    '#type'          => 'checkbox',
    '#title'         => t('Expand the node form fieldset'),
    '#default_value' => variable_get('subscriptions_form_expanded', 0),
    '#description'   => t('Displays the fieldset with the node page subscriptions sub-form in expanded state.  Default is OFF.'),
  );
  $form['display_settings']['note'] = array(
    '#value'         => '<p>'. t("Note: Our <b>favorite display settings</b> are the exact opposites of the defaults, but we chose the defaults, because they work without enabling the Subscriptions block.") .'</p>',
  );
  $form['display_settings']['subscriptions_show_by_author_options'] = array(
    '#type'          => 'checkbox',
    '#title'         => t("Show 'by author' subscriptions options"),
    '#default_value' => variable_get('subscriptions_show_by_author_options', 1),
    '#description'   => t("If you don't want your users to subscribe 'by author', then turn this off.  Default is ON."),
  );
}

/**
 * Ask for permission to display the subscriptions interface
 * for the given node.
 *
 * This should be used as follows:
 *   if (module_invoke('subscriptions_ui', 'get_permission_to_handle', $nid, 'mymodule') !== FALSE) {
 *     my_module_display_interface($nid);
 *   }
 * and mymodule needs to implement hook_subscriptions_ui(), see below.
 */
function subscriptions_ui_get_permission_to_handle($nid, $module)
{
  if (subscriptions_node_is_blocked($nid) || !user_access('subscribe to content')) {
    return FALSE;
  }

  static $permissions = array();
  if (empty($permissions[$nid])) {
    foreach (module_implements('subscriptions_ui') as $m) {
      $perm = module_invoke($m, 'subscriptions_ui', $nid);
      if (empty($permissions[$nid]) || $permissions[$nid]['priority'] < $perm['priority'] ) {
        $permissions[$nid] = $perm;
      }
    }
  }
  return $permissions[$nid]['module'] == $module;
}

/**
 * Implementation of hook_subscriptions_ui().
 *
 * subscriptions_ui is willing to handle all $nids.
 * Other modules can return a higher priority with their name
 * (or a different name!) depending on the $nid, $user, etc.
 */
function subscriptions_ui_subscriptions_ui($nid)
{
  return array('priority' => 0, 'module' => 'subscriptions_ui');
}

/**
 * Implementation of hook hook_content_extra_fields().
 *
 * Enables CCK (admin/content/types/CONTENT_TYPE/fields) to configure the
 * position of the Subscribe fieldset within the node.
 *
 * @ingroup hooks
 */
function subscriptions_ui_content_extra_fields($type_name) {
  $extra = array();
  if (!variable_get('subscriptions_form_in_block', 0)) {
    $extra['subscriptions_ui'] = array(
      'label' => t('Subscribe'),
      'description' => t('!Subscriptions_UI module form.', array('!Subscriptions_UI' => 'Subscriptions UI')),
      'weight' => 100,
    );
  }
  return $extra;
}