<?php
/**
 * @file
 * Provide jquery carousel style plugin for views.
 */

// Trying to make sure the theme.inc get's loaded.
include_once 'views/theme/jquery_carousel.theme.inc';

/**
 * Implements hook_help().
 */
function jquery_carousel_help($path, $arg) {
  $help_text = '';
  switch ($path) {
    case 'admin/help#jquery_carousel':
      $help_text = '<p>' . t('jQuery carousel is based on the jquery plugin http://github.com/richardscarrott/jquery-ui-carousel. It allows developers to create carousels using the data entered through the content types.') . '</p>';
      $help_text .= '<p>' . t('For more details, check the documentation on the project page(https://www.drupal.org/project/jquery_carousel)') . '</p>';
      $help_text .= '<p>' . t('Demo available at http://jcarousel.qed42.webfactional.com');
      break;
  }
  return $help_text;
}

/**
 * Implements hook_views_api().
 */
function jquery_carousel_views_api() {
  return array(
    'api' => '3',
    'path' => drupal_get_path('module', 'jquery_carousel') . '/views',
  );
}

/**
 * Implements hook_field_formatter_info().
 */
function jquery_carousel_field_formatter_info() {
  return array(
    // Key must be unique, so it's best to prefix with your module's name.
    'jquery_carousel_images' => array(
      // Label is is what is displayed in the select box in the UI.
      'label' => t('jQuery Carousel'),
      // Field types is the important bit!!
      // List the field types your formatter is for.
      'field types' => array('image'),
      // Settings form for jquery carousel formatter.
      'settings'  => _jquery_carousel_formatter_defaults(),
    ),
  );
}

/**
 * Formatter settings form.
 */
function _jquery_carousel_formatter_defaults($settings = array()) {
  $settings +=
    array(
      'theme' => 'default',
      'selector' => 'rs-carousel',
      'style_name' => 'thumbnail',
      'itemsPerTransition' => 'auto',
      'orientation' => 'horizontal',
      'loop' => FALSE,
      'whitespace' => FALSE,
      'nextPrevActions' => TRUE,
      'pagination' => FALSE,
      'speed' => 'normal',
      'easing' => 'swing',
      'autoScroll' => TRUE,
      'interval' => 8000,
      'continuous' => FALSE,
      'touch' => TRUE,
    );

  return $settings;
}

/**
 * Implements hook_field_formatter_settings_form().
 */
function jquery_carousel_field_formatter_settings_form($field, $instance, $view_mode, $form, &$form_state) {
  $display = $instance['display'][$view_mode];
  $settings = _jquery_carousel_formatter_defaults($display['settings']);

  $jquery_carousel_form = jquery_carousel_config_form();
  $jquery_carousel_form['style_name'] = array(
    '#type' => 'select',
    '#title' => t('Image Style'),
    '#description' => t('Select the image style to be associated.'),
    '#options' => image_style_options(),
    '#weight' => -1,
    '#default_value' => '',
  );
  $jquery_carousel_form['selector']['#element_validate'] = array('jquery_carousel_config_form_validate');

  foreach ($jquery_carousel_form as $key => $form) {
    $jquery_carousel_form[$key]['#default_value'] = isset($settings[$key]) ? $settings[$key] : $jquery_carousel_form[$key]['#default_value'];
  }

  return $jquery_carousel_form;
}

/**
 * Element validator for selector field.
 */
function jquery_carousel_config_form_validate($element, &$form_state, $form) {
  $selector = $element['#value'];
  _jquery_carousel_config_validate($element, $selector);
}

/**
 * Validation logic for carousel config.
 */
function _jquery_carousel_config_validate($element, $selector, $type = 'element') {
  preg_match('/[a-zA-Z|-]*/', $selector, $matches);
  if ((count($matches) === 1) && ($matches[0] === $selector)) {
  }
  else {
    if ($type == 'view') {
      form_set_error($element, t("Selector should any special characters or spaces. Only special character allowed is '-'"));
    }
    else {
      form_error($element, t("Selector should any special characters or spaces. Only special character allowed is '-'"));
    }
  }
}

/**
 * Implements hook_field_formatter_settings_summary().
 *
 * Returns a short summary for the current formatter settings of an instance.
 */
function jquery_carousel_field_formatter_settings_summary($field, $instance, $view_mode) {
  $summary = array();

  $summary[] = t('Displays multivalued image field content in form of a carousel.');

  return implode('<br />', $summary);
}

/**
 * Implements hook_field_formatter_view().
 */
function jquery_carousel_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
  $element = array();
  if (!$items) {
    return $element;
  }

  // Initialize formatter settings.
  $settings = _jquery_carousel_formatter_defaults($display['settings']);

  // Theme the result.
  $element[] = array(
    '#markup' => theme(
      'jquery_carousel_field_formatter',
      array(
        'element'  => $items,
        'display'  => $display,
        'settings' => $settings,
      )
    ),
  );

  return $element;
}

/**
 * Implements hook_theme().
 */
function jquery_carousel_theme() {
  return array(
    'jquery_carousel_field_formatter' => array(
      'element' => array(),
      'display' => '',
      'settings' => array(),
    ),
  );
}

/**
 * Theme callback for jQeury carousel field formatter.
 */
function theme_jquery_carousel_field_formatter($vars) {

  _jquery_carousel_settings_format($vars['settings']);
  _jquery_carousel_include_css_js($vars['settings']);

  $output = '';

  if (is_array($vars['element']) && (count($vars['element']) > 1)) {
    $selector_class = drupal_attributes(array('class' => $vars['settings']['selector']));
    $output .= '<div ' . $selector_class . '">';
    $output .= '<ul>';
    foreach ($vars['element'] as $elem) {
      $output .= '<li>';
      $output .= theme('image_style', array('path' => $elem['uri'], 'style_name' => $vars['settings']['style_name']));
      $output .= '</li>';
    }
    $output .= '</ul>';
    $output .= '</div>';
  }
  else {
    $output .= theme('image_style', array('path' => $vars['element'][0]['uri'], 'style_name' => $vars['settings']['style_name']));
  }

  return $output;
}
/**
 * Template preprocessor for jquery carousel views style plugin.
 */
function template_preprocess_jquery_carousel(&$vars) {
  _jquery_carousel_preprocess_jquery_carousel($vars);
}

/**
 * Helper function to create config form. Reusable for field formatter & views.
 */
function jquery_carousel_config_form() {
  $form = $themes = array();

  foreach (jquery_carousel_themes() as $key => $theme) {
    $themes[$key] = $theme['title'];
  }

  $themes[''] = t('None');
  $form['theme'] = array(
    '#type' => 'select',
    '#title' => t('jQuery Carousel Theme'),
    '#description' => t('Select the theme to be applied to the carousel'),
    '#options' => $themes,
    '#default_value' => '',
  );

  $form['selector'] = array(
    '#type' => 'textfield',
    '#title' => t('Selector for this carousel configuration'),
    '#description' => t('The carousel will be wrapped in this class & JS with the config below gets applied to this selector. Please make sure the selector contains only alphabets. No special characters or spaces allowed.'),
    '#required' => TRUE,
  );

  $form['itemsPerTransition'] = array(
    '#type' => 'textfield',
    '#title' => t('Items per transition'),
    '#description' => t('number of items moved with each transition, default: auto'),
    '#default_value' => 'auto',
  );

  $form['orientation'] = array(
    '#type' => 'select',
    '#title' => t('Orientation'),
    '#description' => t('Sets the orientation of the carousel, either horizontal or vertical.'),
    '#options' => array('horizontal' => t('Horizontal'), 'vertical' => t('Vertical')),
    '#default_value' => 1,
  );

  $form['loop'] = array(
    '#type' => 'select',
    '#title' => t('Loop'),
    '#description' => t('If set to true carousel will loop back to first or last page accordingly.'),
    '#options' => array(0 => t('False'), 1 => t('True')),
    '#default_value' => 1,
    '#boolean' => TRUE,
  );

  $form['whitespace'] = array(
    '#type' => 'select',
    '#title' => t('Whitespace'),
    '#description' => t("If set to true the carousel will allow whitespace to be seen when there aren't enough items to fill the last page."),
    '#options' => array(0 => t('False'), 1 => t('True')),
    '#default_value' => 1,
    '#boolean' => TRUE,
  );

  $form['nextPrevActions'] = array(
    '#type' => 'select',
    '#title' => t('Next & Previous Links'),
    '#description' => t('whether next and prev links will be included'),
    '#options' => array(0 => t('False'), 1 => t('True')),
    '#default_value' => 1,
    '#boolean' => TRUE,
  );

  $form['pagination'] = array(
    '#type' => 'select',
    '#title' => t('Pagination'),
    '#description' => t('whether pagination links will be included'),
    '#options' => array(0 => t('False'), 1 => t('True')),
    '#default_value' => 1,
    '#boolean' => TRUE,
  );

  $form['speed'] = array(
    '#type' => 'select',
    '#title' => t('Speed'),
    '#description' => t('Animation speed'),
    '#options' => array(
      'normal' => t('Normal'),
      'fast' => t('Fast'),
      'slow' => t('Slow'),
    ),
    '#default_value' => 'normal',
  );

  $form['easing'] = array(
    '#type' => 'select',
    '#title' => t('Easing'),
    '#description' => t('supports the jQuery easing plugin'),
    '#options' => array('linear' => t('Linear'), 'swing' => t('Swing')),
    '#default_value' => 'linear',
  );

  $form['autoScroll'] = array(
    '#type' => 'select',
    '#title' => t('Autoscroll'),
    '#description' => t("Set to true to invoke auto scrolling, note when the mouse enters the carousel the interval will stop, it'll consequently begin when the mouse leaves."),
    '#options' => array(0 => t('False'), 1 => t('True')),
    '#default_value' => 1,
    '#boolean' => TRUE,
  );

  $form['interval'] = array(
    '#type' => 'textfield',
    '#title' => t('Interval'),
    '#description' => t('Sets the amount of time in miliseconds the carousel waits before it automatically scrolls.'),
    '#default_value' => 8000,
  );

  $form['continuous'] = array(
    '#type' => 'select',
    '#title' => t('Continuous'),
    '#description' => t('If set to true the carousel will continuously loop through its pages rather than scrolling all the way back to the first page.'),
    '#options' => array(0 => t('False'), 1 => t('True')),
    '#default_value' => 1,
    '#boolean' => TRUE,
  );

  $form['touch'] = array(
    '#type' => 'select',
    '#title' => t('Touch'),
    '#description' => t('If set to true the carousel will become draggable allowing you to flick through pages.'),
    '#options' => array(0 => t('False'), 1 => t('True')),
    '#default_value' => 1,
    '#boolean' => TRUE,
  );

  return $form;
}

/**
 * Helper function to prepare the settings to be exposed in JS.
 *
 * Helps convert boolean 1s & 0s into boolean strings
 */
function _jquery_carousel_settings_format(&$settings) {
  $carousel_form = jquery_carousel_config_form();
  foreach (array_keys($settings) as $key) {
    if ((isset($carousel_form[$key]['#boolean'])) && ($carousel_form[$key]['#boolean'])) {
      $settings[$key] = (bool) $settings[$key];
    }
  }
}

/**
 * Helper function to inject required Css & Js.
 */
function _jquery_carousel_include_css_js($settings) {
  $themes = jquery_carousel_themes();
  drupal_add_library('system', 'ui.widget');
  if (isset($settings['theme']) && ($settings['theme'])) {
    drupal_add_css(drupal_get_path('module', $themes[$settings['theme']]['module']) . '/' . $themes[$settings['theme']]['file']);
  }

  drupal_add_css(libraries_get_path('jquery-ui-carousel') . '/dist/css/jquery.rs.carousel.css');
  drupal_add_js(libraries_get_path('jquery-ui-carousel') . '/dist/js/jquery.rs.carousel.js');
  drupal_add_js(libraries_get_path('jquery-ui-carousel') . '/dist/js/jquery.rs.carousel-autoscroll.js');
  drupal_add_js(libraries_get_path('jquery-ui-carousel') . '/dist/js/jquery.rs.carousel-continuous.js');
  drupal_add_js(libraries_get_path('jquery-ui-carousel') . '/dist/js/jquery.rs.carousel-touch.js');
  drupal_add_js(drupal_get_path('module', 'jquery_carousel') . '/js/jquery_carousel.init.js');

  if (isset($settings['touch']) && ($settings['touch'])) {
    drupal_add_js(libraries_get_path('jquery-ui-carousel') . '/vendor/jquery.event.drag.js');
  }
  drupal_add_js(array('jquery_carousel' => array($settings['selector'] => $settings)), 'setting');

}

/**
 * Implements hook_carousel_theme_info().
 */
function jquery_carousel_carousel_theme_info() {
  $themes = array();

  $themes['default'] = array(
    'title' => t('Default'),
    'file' => 'jcarousel-themes/default/jquery-carousel-default.css',
  );
  $themes['glass'] = array(
    'title' => t('Glass'),
    'file' => 'jcarousel-themes/glass/jquery-carousel-glass.css',
  );

  return $themes;
}

/**
 * Retrieves a list of all available jQuery Carousel themes.
 */
function jquery_carousel_themes() {
  $themes = &drupal_static(__FUNCTION__);

  // Don't rebuild if we already have a list of themes.
  if (isset($themes)) {
    return $themes;
  }

  // Build a list of themes from other modules.
  $themes = array();
  foreach (module_implements('carousel_theme_info') as $module) {
    $function = $module . '_carousel_theme_info';
    $module_themes = $function();
    foreach ($module_themes as $key => $theme) {
      $theme['module'] = $module;
      $theme['file path'] = isset($theme['file path']) ? $theme['file path'] : drupal_get_path('module', $module);
      $theme['title'] = isset($theme['title']) ? $theme['title'] : $key;
      $themes[$key] = $theme;
    }
  }
  ksort($themes);
  return $themes;
}