<?php

// $Id: trigger.admin.inc,v 1.5 2008/01/08 10:35:43 goba Exp $

/**

 * @file

 * Admin page callbacks for the trigger module.

 */

/**

 * Build the form that allows users to assign actions to hooks.

 *

 * @param $type

 *   Name of hook.

 * @return

 *   HTML form.

 */

function trigger_assign($type = NULL) {

  // If no type is specified we default to node actions, since they

  // are the most common.

  if (!isset($type)) {

    drupal_goto('admin/build/trigger/node');

  }

  if ($type == 'node') {

    $type = 'nodeapi';

  }

  $output = '';

  $hooks = module_invoke_all('hook_info');

  foreach ($hooks as $module => $hook) {

    if (isset($hook[$type])) {

      foreach ($hook[$type] as $op => $description) {

        $form_id = 'trigger_'. $type .'_'. $op .'_assign_form';

        $output .= drupal_get_form($form_id, $type, $op, $description['runs when']);

      }

    }

  }

  return $output;

}

/**

 * Confirm removal of an assigned action.

 *

 * @param $hook

 * @param $op

 * @param $aid

 *   The action ID.

 * @ingroup forms

 * @see trigger_unassign_submit()

 */

function trigger_unassign($form_state, $hook = NULL, $op = NULL, $aid = NULL) {

  if (!($hook && $op && $aid)) {

    drupal_goto('admin/build/trigger/assign');

  }

  $form['hook'] = array(

    '#type' => 'value',

    '#value' => $hook,

  );

  $form['operation'] = array(

    '#type' => 'value',

    '#value' => $op,

  );

  $form['aid'] = array(

    '#type' => 'value',

    '#value' => $aid,

  );

  $action = actions_function_lookup($aid);

  $actions = actions_get_all_actions();

  $destination = 'admin/build/trigger/'. ($hook == 'nodeapi' ? 'node' : $hook);

  return confirm_form($form,

    t('Are you sure you want to unassign the action %title?', array('%title' => $actions[$action]['description'])),

    $destination,

    t('You can assign it again later if you wish.'),

    t('Unassign'), t('Cancel')

  );

}

function trigger_unassign_submit($form, &$form_state) {

  $form_values = $form_state['values'];

  if ($form_values['confirm'] == 1) {

    $aid = actions_function_lookup($form_values['aid']);

    db_query("DELETE FROM {trigger_assignments} WHERE hook = '%s' AND op = '%s' AND aid = '%s'", $form_values['hook'], $form_values['operation'], $aid);

    $actions = actions_get_all_actions();

    watchdog('actions', 'Action %action has been unassigned.',  array('%action' => check_plain($actions[$aid]['description'])));

    drupal_set_message(t('Action %action has been unassigned.', array('%action' => $actions[$aid]['description'])));

    $hook = $form_values['hook'] == 'nodeapi' ? 'node' : $form_values['hook'];

    $form_state['redirect'] = 'admin/build/trigger/'. $hook;

  }

  else {

    drupal_goto('admin/build/trigger');

  }

}

/**

 * Create the form definition for assigning an action to a hook-op combination.

 *

 * @param $form_state

 *   Information about the current form.

 * @param $hook

 *   The name of the hook, e.g., 'nodeapi'.

 * @param $op

 *   The name of the hook operation, e.g., 'insert'.

 * @param $description

 *   A plain English description of what this hook operation does.

 * @return

 *

 * @ingoup forms

 * @see trigger_assign_form_validate()

 * @see trigger_assign_form_submit()

 */

function trigger_assign_form($form_state, $hook, $op, $description) {

  $form['hook'] = array(

    '#type' => 'hidden',

    '#value' => $hook,

  );

  $form['operation'] = array(

    '#type' => 'hidden',

    '#value' => $op,

  );

  // All of these forms use the same validate and submit functions.

  $form['#validate'][] = 'trigger_assign_form_validate';

  $form['#submit'][] = 'trigger_assign_form_submit';

  $options = array();

  $functions = array();

  // Restrict the options list to actions that declare support for this hook-op

  // combination.

  foreach (actions_list() as $func => $metadata) {

    if (isset($metadata['hooks']['any']) || (isset($metadata['hooks'][$hook]) && is_array($metadata['hooks'][$hook]) && (in_array($op, $metadata['hooks'][$hook])))) {

      $functions[] = $func;

    }

  }

  foreach (actions_actions_map(actions_get_all_actions()) as $aid => $action) {

    if (in_array($action['callback'], $functions)) {

      $options[$action['type']][$aid] = $action['description'];

    }

  }

  $form[$op] = array(

    '#type' => 'fieldset',

    '#title' => t('Trigger: ') . $description,

    '#theme' => 'trigger_display'

    );

  // Retrieve actions that are already assigned to this hook-op combination.

  $actions = _trigger_get_hook_actions($hook, $op);

  $form[$op]['assigned']['#type'] = 'value';

  $form[$op]['assigned']['#value'] = array();

  foreach ($actions as $aid => $description) {

    $form[$op]['assigned']['#value'][$aid] = array(

      'description' => $description,

      'link' => l(t('unassign'), "admin/build/trigger/unassign/$hook/$op/". md5($aid))

    );

  }

  $form[$op]['parent'] = array(

    '#prefix' => "<div class='container-inline'>",

    '#suffix' => '</div>',

  );

  // List possible actions that may be assigned.

  if (count($options) != 0) {

    array_unshift($options, t('Choose an action'));

    $form[$op]['parent']['aid'] = array(

      '#type' => 'select',

      '#options' => $options,

    );

    $form[$op]['parent']['submit'] = array(

      '#type' => 'submit',

      '#value' => t('Assign')

    );

  }

  else {

    $form[$op]['none'] = array(

      '#value' => t('No available actions for this trigger.')

    );

  }

  return $form;

}

/**

 * Validation function for trigger_assign_form().

 *

 * Makes sure that the user is not re-assigning an action to an event.

 */

function trigger_assign_form_validate($form, $form_state) {

  $form_values = $form_state['values'];

  if (!empty($form_values['aid'])) {

    $aid = actions_function_lookup($form_values['aid']);

    if (db_result(db_query("SELECT aid FROM {trigger_assignments} WHERE hook = '%s' AND op = '%s' AND aid = '%s'", $form_values['hook'], $form_values['operation'], $aid))) {

      form_set_error($form_values['operation'], t('The action you chose is already assigned to that trigger.'));

    }

  }

}

/**

 * Submit function for trigger_assign_form().

 */

function trigger_assign_form_submit($form, $form_state) {

  $form_values = $form_state['values'];

  if (!empty($form_values['aid'])) {

    $aid = actions_function_lookup($form_values['aid']);

    $weight = db_result(db_query("SELECT MAX(weight) FROM {trigger_assignments} WHERE hook = '%s' AND op = '%s'", $form_values['hook'], $form_values['operation']));

    db_query("INSERT INTO {trigger_assignments} values ('%s', '%s', '%s', %d)", $form_values['hook'], $form_values['operation'], $aid, $weight + 1);

    // If this action changes a node property, we need to save the node

    // so the change will persist.

    $actions = actions_list();

    if (isset($actions[$aid]['behavior']) && in_array('changes_node_property', $actions[$aid]['behavior']) && ($form_values['operation'] != 'presave')) {

      // Delete previous node_save_action if it exists, and re-add a new one at a higher weight.

      $save_post_action_assigned = db_result(db_query("SELECT aid FROM {trigger_assignments} WHERE hook = '%s' AND op = '%s' AND aid = 'node_save_action'", $form_values['hook'], $form_values['operation']));

      if ($save_post_action_assigned) {

        db_query("DELETE FROM {trigger_assignments} WHERE hook = '%s' AND op = '%s' AND aid = 'node_save_action'", $form_values['hook'], $form_values['operation']);

      }

      db_query("INSERT INTO {trigger_assignments} VALUES ('%s', '%s', '%s', %d)", $form_values['hook'], $form_values['operation'], 'node_save_action', $weight + 2);

      if (!$save_post_action_assigned) {

        drupal_set_message(t('You have added an action that changes a the property of a post. A Save post action has been added so that the property change will be saved.'));

      }

    }

  }

}

/**

 * Display actions assigned to this hook-op combination in a table.

 *

 * @param array $element

 *   The fieldset including all assigned actions.

 * @return

 *   The rendered form with the table prepended.

 *

 * @ingroup themeable

 */

function theme_trigger_display($element) {

  $header = array();

  $rows = array();

  if (count($element['assigned']['#value'])) {

    $header = array(array('data' => t('Name')), array('data' => t('Operation')));

    $rows = array();

    foreach ($element['assigned']['#value'] as $aid => $info) {

      $rows[] = array(

        $info['description'],

        $info['link']

      );

    }

  }

  if (count($rows)) {

    $output = theme('table', $header, $rows) . drupal_render($element);

  }

  else {

    $output = drupal_render($element);

  }

  return $output;

}

/**

 * Get the actions that have already been defined for this

 * type-hook-op combination.

 *

 * @param $type

 *   One of 'node', 'user', 'comment'.

 * @param $hook

 *   The name of the hook for which actions have been assigned,

 *   e.g. 'nodeapi'.

 * @param $op

 *   The hook operation for which the actions have been assigned,

 *   e.g., 'view'.

 * @return

 *   An array of action descriptions keyed by action IDs.

 */

function _trigger_get_hook_actions($hook, $op, $type = NULL) {

  $actions = array();

  if ($type) {

    $result = db_query("SELECT h.aid, a.description FROM {trigger_assignments} h LEFT JOIN {actions} a on a.aid = h.aid WHERE a.type = '%s' AND h.hook = '%s' AND h.op = '%s' ORDER BY h.weight", $type, $hook, $op);

  }

  else {

    $result = db_query("SELECT h.aid, a.description FROM {trigger_assignments} h LEFT JOIN {actions} a on a.aid = h.aid WHERE h.hook = '%s' AND h.op = '%s' ORDER BY h.weight", $hook, $op);

  }

  while ($action = db_fetch_object($result)) {

    $actions[$action->aid] = $action->description;

  }

  return $actions;

}