<?php

/**
 * @file js_injector.install
 *
 * Install, update and uninstall functions for the js_injector module.
 */

/**
 * Implements hook_schema().
 */
function js_injector_schema() {
  $schema['js_injector_rule'] = array(
    'description' => t('Table storing JS injector rule definitions.'),
    'export' => array(
      'key' => 'name',
      'primary key' => 'crid',
      'identifier' => 'rule', // Exports will be defined as $rule
      'default hook' => 'js_injector_rule',
      'save callback' => 'js_injector_rule_save',
      'delete callback' => 'js_injector_rule_delete',
      'api' => array(
        'owner' => 'js_injector',
        'api' => 'js_injector_rules',  // Base name for api include files.
        'minimum_version' => 1,
        'current_version' => 1,
      ),
    ),
    'fields' => array(
      'name' => array(
        'type' => 'varchar',
        'length' => '255',
        'description' => 'Unique ID for rules. Used to identify them programmatically.',
      ),
      'crid' => array(
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'description' => 'The primary identifier for the JS injection rule',
        'no export' => TRUE, // do not export database-only keys.
      ),
      // Changed to 'admin_description' in an update hook.
      'admin_description' => array(
        'type' => 'varchar',
        'length' => '255',
        'description' => 'A human readable name of a rule.',
      ),
      'js' => array(
        'type' => 'text',
        'size' => 'big',
        'description' => 'The actual JavaScript code.',
      ),
      'position' => array(
        'type' => 'varchar',
        'length' => '255',
        'description' => 'The scope of the JavaScript on the page (e.g. header or footer).',
      ),
      'preprocess' => array(
        'description' => 'Boolean indicating whether the rule should be aggregated into other JS files.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'inline' => array(
        'description' => 'Boolean indicating whether the rules should be inline (cannot be aggregated).',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'page_visibility' => array(
        'description' => 'Boolean indicating whether the rule has a white or black list for page visibility.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'page_visibility_pages' => array(
        'type' => 'text',
        'size' => 'big',
        'description' => 'A list of pages to either hide or show the JavaScript.',
      ),
    ),
    'primary key' => array('crid'),
    'unique keys' => array(
      'name' => array('name'),
    ),
  );
  return $schema;
}

/*
 * Implements hook_install().
 *
 * This is required to create required files directory.
 */
function js_injector_install() {
  if (!js_injector_prepare_directory()) {
    drupal_set_message(t('The JS injector cache directory could not be created. Please see the <a href="!url">status report</a> for more detail.', array(
      '!url' => 'admin/reports/status',
    )), 'error');
  }
}

/**
 * Implements hook_uninstall().
 *
 * This is required to cleanup the left over files.
 */
function js_injector_uninstall() {
  // Clean up the directory and all rules, we first need to include the module
  // file that defines the constant.
  module_load_include('module', 'js_injector');
  file_unmanaged_delete_recursive(drupal_realpath(JS_INJECTOR_DIRECTORY_URI));
}

/**
 * Implements hook_requirements().
 *
 * We'll use this to prevent installation of the module if the file directory
 * is not available and writable.
 */
function js_injector_requirements($phase) {
  $requirements = array();
  if ($phase == 'runtime') {
    $requirements['js_injector_cache_dir'] = array(
      'title' => t('JS injector cache dir'),
      'severity' => REQUIREMENT_OK,
      'value' => t('Exists'),
    );

    if (!js_injector_prepare_directory()) {
      $requirements['js_injector_cache_dir']['description'] = t('The JS injector cache directory, %path could not be created due to a misconfigured files directory. Please ensure that the files directory is correctly configured and that the webserver has permission to create directories.', array('%path' => file_uri_target(JS_INJECTOR_DIRECTORY_URI)));
      $requirements['js_injector_cache_dir']['severity'] = REQUIREMENT_ERROR;
      $requirements['js_injector_cache_dir']['value'] = t('Unable to create');
    }
  }

  return $requirements;
}

/**
 * Make sure that the js_injector files directory has been created.
 *
 * @return bool TRUE if the directory exists (or was created) and is writable.
 *              FALSE otherwise.
 */
function js_injector_prepare_directory() {
  $path = JS_INJECTOR_DIRECTORY_URI;
  return file_prepare_directory($path, FILE_CREATE_DIRECTORY);
}

/**
 * Change the description field to be called 'admin_description' so that it is displayed on the export UI list form.
 */
function js_injector_update_7001(&$sandbox) {
  // Quick sanity check to ensure the column exists.
  if (db_field_exists('js_injector_rule', 'description')) {
    db_change_field('js_injector_rule', 'description', 'admin_description', array(
      'type' => 'varchar',
      'length' => '255',
      'description' => 'A human readable name of a rule.',
    ));
  }
}