<?php
/**
 * @file
 * Provides an API for integrating the jQuery Masonry plugin with Drupal.
 */

/**
 * Implements hook_libraries_info().
 */
function masonry_libraries_info() {
  $libraries['masonry'] = array(
    'name' => 'jQuery Masonry',
    'vendor url' => 'http://masonry.desandro.com/',
    'download url' => 'http://masonry.desandro.com/',
    'version arguments' => array(
      'file' => 'jquery.masonry.min.js',
      // 2.x: jQuery Masonry v2.1.05
      'pattern' => '/jQuery\s+Masonry\s+v?([0-9\.]+)/',
      'lines' => 2,
      'cols' => 30,
    ),
    'files' => array(
      'js' => array(
        'jquery.masonry.min.js',
      ),
    ),
  );

  return $libraries;
}

/**
 * Check if the Masonry library is installed.
 *
 * @return
 *   A boolean indicating the installed status.
 */
function masonry_installed() {
  if (($library = libraries_detect('masonry')) && !empty($library['installed'])) {
    return TRUE;
  }
  else {
    return FALSE;
  }
}

/**
 * Check if the Masonry library has been loaded.
 *
 * @return
 *   A boolean indicating the loaded status.
 */
function masonry_loaded() {
  if (($library = libraries_load('masonry')) && !empty($library['loaded'])) {
    return TRUE;
  }
  else {
    return FALSE;
  }
}

/**
 * Get default Masonry options.
 *
 * @return
 *   An associative array of default options for Masonry.
 *   Contains:
 *   - masonry_column_width: The width of each column (in pixels or as a
 *     percentage).
 *   - masonry_column_width_units: The units to use for the column width ('px'
 *     or '%').
 *   - masonry_gutter_width: The spacing between each column (in pixels).
 *   - masonry_resizable: Automatically rearrange items when the container is
 *     resized.
 *   - masonry_animated: Animate item rearrangements.
 *   - masonry_animation_duration: The duration of animations (in milliseconds).
 *   - masonry_fit_width: Sets the width of the container to the nearest column.
 *     Ideal for centering Masonry layouts.
 *   - masonry_rtl: Display items from right-to-left.
 *   - masonry_images_first: Load all images first before triggering Masonry.
 */
function masonry_default_options() {
  $options = array(
    'masonry_column_width' => '',
    'masonry_column_width_units' => 'px',
    'masonry_gutter_width' => '0',
    'masonry_resizable' => 1,
    'masonry_animated' => 0,
    'masonry_animation_duration' => '500',
    'masonry_fit_width' => 0,
    'masonry_rtl' => 0,
    'masonry_images_first' => 1,
  );

  // Allow other modules to alter the default options
  drupal_alter('masonry_default_options', $options);

  return $options;
}

/**
 * Add Masonry options to an existing form.
 *
 * @param $form
 *   A form array to add Masonry options to.
 * @param $default_values
 *   An array of default form values.
 */
function masonry_add_options_to_form(&$form, $default_values) {
  $form['masonry_column_width'] = array(
    '#type' => 'textfield',
    '#title' => t('Column width'),
    '#description' => t("The width of each column."),
    '#default_value' => $default_values['masonry_column_width'],
    '#size' => 5,
    '#maxlength' => 4,
  );
  $form['masonry_column_width_units'] = array(
    '#type' => 'radios',
    '#title' => t('Column width units'),
    '#description' => t("The units to use for the column width."),
    '#options' => array(
      'px' => t("Pixels"),
      '%' => t("Percentage (of container's width)"),
    ),
    '#default_value' => $default_values['masonry_column_width_units'],
  );
  $form['masonry_gutter_width'] = array(
    '#type' => 'textfield',
    '#title' => t('Gutter width'),
    '#description' => t("The spacing between each column."),
    '#default_value' => $default_values['masonry_gutter_width'],
    '#size' => 4,
    '#maxlength' => 3,
    '#field_suffix' => t('px'),
  );
  $form['masonry_resizable'] = array(
    '#type' => 'checkbox',
    '#title' => t('Resizable'),
    '#description' => t("Automatically rearrange items when the container is resized."),
    '#default_value' => $default_values['masonry_resizable'],
  );
  $form['masonry_animated'] = array(
    '#type' => 'checkbox',
    '#title' => t('Animated'),
    '#description' => t("Animate item rearrangements."),
    '#default_value' => $default_values['masonry_animated'],
    '#states' => array(
      'visible' => array(
        'input.form-checkbox[name$="[masonry_resizable]"]' => array('checked' => TRUE),
      ),
    ),
  );
  $form['masonry_animation_duration'] = array(
    '#type' => 'textfield',
    '#title' => t('Animation duration'),
    '#description' => t("The duration of animations (1000 ms = 1 sec)."),
    '#default_value' => $default_values['masonry_animation_duration'],
    '#size' => 5,
    '#maxlength' => 4,
    '#field_suffix' => t('ms'),
    '#states' => array(
      'visible' => array(
        'input.form-checkbox[name$="[masonry_resizable]"]' => array('checked' => TRUE),
        'input.form-checkbox[name$="[masonry_animated]"]' => array('checked' => TRUE),
      ),
    ),
  );
  $form['masonry_fit_width'] = array(
    '#type' => 'checkbox',
    '#title' => t('Fit width'),
    '#description' => t("Sets the width of the container to the nearest column. Ideal for centering Masonry layouts. See the <a href='http://masonry.desandro.com/demos/centered.html'>'Centered' demo</a> for more information."),
    '#default_value' => $default_values['masonry_fit_width'],
  );
  $form['masonry_rtl'] = array(
    '#type' => 'checkbox',
    '#title' => t('RTL layout'),
    '#description' => t("Display items from right-to-left."),
    '#default_value' => $default_values['masonry_rtl'],
  );
  $form['masonry_images_first'] = array(
    '#type' => 'checkbox',
    '#title' => t('Load images first'),
    '#description' => t("Load all images first before triggering Masonry."),
    '#default_value' => $default_values['masonry_images_first'],
  );

  // Allow other modules to alter the form
  drupal_alter('masonry_options_form', $form, $default_values);
}

/**
 * Apply Masonry to a container.
 *
 * @param $container
 *   The CSS selector of the container element to apply Masonry to.
 * @param $options
 *   An associative array of Masonry options.
 *   Contains:
 *   - masonry_item_selector: The CSS selector of the items within the
 *     container.
 *   - masonry_column_width: The width of each column (in pixels or as a
 *     percentage).
 *   - masonry_column_width_units: The units to use for the column width ('px'
 *     or '%').
 *   - masonry_gutter_width: The spacing between each column (in pixels).
 *   - masonry_resizable: Automatically rearrange items when the container is
 *     resized.
 *   - masonry_animated: Animate item rearrangements.
 *   - masonry_animation_duration: The duration of animations (in milliseconds).
 *   - masonry_fit_width: Sets the width of the container to the nearest column.
 *     Ideal for centering Masonry layouts.
 *   - masonry_rtl: Display items from right-to-left.
 *   - masonry_images_first: Load all images first before triggering Masonry.
 */
function masonry_apply($container, $options = array()) {
  if (masonry_loaded() && !empty($container)) {
    // For any options not specified, use default options
    $options += masonry_default_options();
    if (!isset($options['masonry_item_selector'])) {
      $options['masonry_item_selector'] = '';
    }

    // Setup Masonry script
    $masonry = array(
      'masonry' => array(
        $container => array(
          'item_selector' => $options['masonry_item_selector'],
          'column_width' => (int) $options['masonry_column_width'],
          'column_width_units' => $options['masonry_column_width_units'],
          'gutter_width' => (int) $options['masonry_gutter_width'],
          'resizable' => (bool) $options['masonry_resizable'],
          'animated' => (bool) $options['masonry_animated'],
          'animation_duration' => (int) $options['masonry_animation_duration'],
          'fit_width' => (bool) $options['masonry_fit_width'],
          'rtl' => (bool) $options['masonry_rtl'],
          'images_first' => (bool) $options['masonry_images_first'],
        ),
      ),
    );
    $script_file = drupal_get_path('module', 'masonry') . '/masonry.js';

    // Allow other modules to alter the Masonry script
    $context = array(
      'container' => $container,
      'options' => $options,
    );
    drupal_alter('masonry_script', $masonry, $script_file, $context);

    // Apply the script
    drupal_add_js($masonry, 'setting');
    drupal_add_js($script_file);
  }
}