<?php

function subscriptions_ui_nodeapi(&$node, $op, $teaser) {
  global $user;
  if ($user->uid && $op == 'view' && $node->nid && !$teaer) {
    $node->content['subscriptions'] = array(
      '#value' => drupal_get_form('subscriptions_ui_form', $node),
      '#weight' => 100,
    );
  }
}

function subscriptions_ui_form($node, $account = NULL) {
  global $user;
  if (!isset($account)) {
    $account = $user;
  }
  $sql = "SELECT 1 FROM {subscriptions} WHERE module = 'node' AND field = '%s' AND value = '%s' AND author = %d AND recipient_uid = %d";
  $key = "node__$node->nid";
  $options[$key] = t('Subscribe to comments to this post');
  if (db_result(db_query($sql, 'node', 'nid', $node->nid, -1, $account->uid))) {
    $defaults[] = $key;
  }
  $type_name = node_get_types('name', $node->type);
  $key = "type__$node->type";
  $options[$key] = t('To %type posts', array('%type' => $type_name));
  if (db_result(db_query($sql, 'node', 'type', $node->type, -1, $account->uid))) {
    $defaults[] = $key;
  }
  $key = 'type__'. $node->type .'__'. $node->uid;
  $options[$key] = t('Subscribe to %type posts by %name', array('%type' => $type_name, '%name' => $node->name));
  if (db_result(db_query($sql, 'node', 'type', $node->type, $node->uid, $account->uid))) {
    $defaults[] = $key;
  }
  foreach ($node->taxonomy as $tid => $term) {
    $key = "taxa__$tid";
    $options[$key] = t('Subscribe to posts in %term.', array('%term' => $term->name));
    if (db_result(db_query($sql, 'node', 'tid', $tid, -1, $account->uid))) {
      $defaults[] = $key;
    }
    $key = 'taxa__'. $tid .'__'. $node->uid;
    $options[$key] = t('Subscribe to posts in %term by %name', array('%term' => $term->name, '%name' => $node->name));
    if (db_result(db_query($sql, 'node', 'tid', $tid, $node->uid, $account->uid))) {
      $defaults[] = $key;
    }
  }
  $form['wrapper'] = array(
    '#type' => 'fieldset',
    '#title' => t('Subscribe'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['wrapper']['subscriptions'] = array(
    '#type' => 'checkboxes',
    '#options' => $options,
  );
  $form['wrapper']['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Subscribe'),
  );
  $form['account'] = array('#type' => 'value', '#value' => $account);
  return $form;
}

// TODO: offer the same form in a block to be put in the contents region.

function subscriptions_ui_form_submit($form_id, $form_values) {
  $stypes = module_invoke_all('subscriptions', 'stypes');
  $recipient_uid = $form_values['account']->uid;
  foreach ($form_values['subscriptions'] as $s => $value) {
    $subscription = explode('__', $s);
    $stype = $stypes[$subscription[0]];
    $args = array($stype[0], $stype[1], $subscription[1], isset($subscription[2]) ? $subscription[2] : -1, $recipient_uid);
    if ($value) {
      call_user_func_array('subscriptions_add', $args);
    }
    else {
      db_query("DELETE FROM {subscriptions} WHERE module = '%s' AND field = '%s' AND value = '%s' AND author = %d AND recipient_uid = %d", $args);
    }
  }
}