<?php

/**
 * @file Provide contextual theme settings via context module
 */

define('DELTA_PRESERVE', 'preserve');
define('DELTA_OVERRIDE', 'override');

global $delta;
  
/**
 * Implements hook_context_plugins().
 */
function delta_context_plugins() {
  return array(
    'context_reaction_delta' => array(
      'handler' => array(
        'path' => drupal_get_path('module', 'delta') . '/plugins',
        'file' => 'context_reaction_delta.inc',
        'class' => 'context_reaction_delta',
        'parent' => 'context_reaction',
      ),
    ),
  );
}

/**
 * Implements hook_context_registry().
 */
function delta_context_registry() {
  return array(
  	'reactions' => array(
      'delta' => array(
        'title' => t('Delta'),
        'description' => t('Apply contextual theme settings via the Delta module.'),
        'plugin' => 'context_reaction_delta',
      ),
    ),
  );
}

/**
 * Implements hook_init().
 */
function delta_init() {
  if ($plugin = context_get_plugin('reaction', 'delta')) {
    $plugin->execute();
  }
}

/**
 * Implements hook_load().
 */
function delta_load($delta) {
  $cache = &drupal_static(__FUNCTION__);
  
  if (!isset($cache[$delta])) {  
    $query = db_select('delta', 'dt')
      ->fields('dt', array('machine_name', 'name', 'theme', 'mode', 'settings'))
      ->condition('machine_name', $delta)
      ->execute()
      ->fetchAll();
      
    $cache[$delta] = reset($query);
  }

  return $cache[$delta];
}

/**
 * @todo
 */
function delta_valid($delta, $key) {
  $delta = delta_load($delta);
  
  return $delta && $delta->theme == $key;
}

/**
 * @todo
 */
function delta_inject_settings($delta, $key) {
  global $conf;

  $cache = &drupal_static('theme_get_setting');
  $cache[$key] = NULL;
  
  return $conf['theme_' . $key . '_settings'] = delta_settings($delta, $key);
}

/**
 * @todo
 */
function delta_layouts() {
  return db_select('delta', 'dt')
    ->fields('dt', array('machine_name', 'name', 'theme'))
    ->orderBy('dt.name')
    ->execute()
    ->fetchAllAssoc('machine_name');
}

/**
 * @todo
 */
function delta_settings($delta, $key) {
  $delta = delta_load($delta);
  $settings = $delta ? unserialize($delta->settings) : array();
  $settings = isset($GLOBALS['conf']['theme_' . $key . '_settings']) ? array_merge($GLOBALS['conf']['theme_' . $key . '_settings'], $settings) : $settings;
  
  return $settings;
}

/**
 * @todo
 */
function delta_layout_options() {
  $options = array();
  foreach (delta_layouts() as $machine_name => $item) {
    $options[$machine_name] = $item->name;
  }
  
  return $options;
}

/**
 * @todo
 */
function delta_settings_prepare($settings, $original, $mode) {
  if ($mode == DELTA_PRESERVE) {
    foreach ($settings as $setting => $value) {
      if (isset($original[$setting]) && $value === $original[$setting]) {
        unset($settings[$setting]);
      }
    }
  }
  else {
    $settings = array_merge($original, $settings);
  }
  
  return $settings;
}

/**
 * @todo
 */
function delta_save_settings($delta, $settings, $original, $mode = DELTA_PRESERVE) {
  $settings = delta_settings_prepare($settings, $original, $mode);
  
  return db_update('delta')
    ->fields(array('settings' => serialize($settings)))
    ->condition('machine_name', $delta)
    ->execute();
}

/**
 * @todo
 */
function delta_theme_options() {
  $themes = list_themes();
  
  $options = array();
  foreach ($themes as $theme => $info) {
    if ($info->status) {
      $options[$theme] = $info->info['name'];
    }
  }
  
  return $options;
}

/**
 * @todo
 */
function delta_save(&$item) {
  if (!empty($item['old'])) {
  	drupal_write_record('delta', $item, 'machine_name');
  }
  else {
    drupal_write_record('delta', $item);	
  }

  return $item;
}

/**
 * @todo
 */
function delta_delete($delta) {
  return db_delete('delta')
    ->condition('machine_name', $delta)
    ->execute();
}