<?php
// $Id: asin.module,v 1.2.2.3 2008/09/12 23:22:21 eaton Exp $

/**
 * @file
 * Defines a field type for referencing an Amazon product.
 */

/**
 * Implementation of hook_theme().
 */
function asin_theme() {
  return array(
    'asin_text' => array(
      'arguments' => array('element'),
    ),
    'asin_lookup' => array(
      'arguments' => array('element'),
    ),
    'asin_formatter_default' => array(
      'arguments' => array('element'),
    ),
    'asin_formatter_thumbnail' => array(
      'arguments' => array('element'),
    ),
    'asin_formatter_details' => array(
      'arguments' => array('element'),
    ),
	// added for Haris - start
    'asin_formatter_fornodes' => array(
      'arguments' => array('element'),
    ),
	// added for Haris - end
    'asin_formatter_inline' => array(
      'arguments' => array('element'),
    ),
  );
}

/**
 * Implementation of hook_field_info().
 *
 * Here we indicate that the content module will use its default
 * handling for the view of this field.
 *
 * Callbacks can be omitted if default handing is used.
 * They're included here just so this module can be used
 * as an example for custom modules that might do things
 * differently.
 */
function asin_field_info() {
  return array(
    'asin' => array(
      'label' => t('Amazon item'),
      'description' => t('Store the id of a product listed on Amazon.com.'),
    ),
  );
}

/**
 * Implementation of hook_field_settings().
 */
function asin_field_settings($op, $field) {
  switch ($op) {
    case 'database columns':
      $columns['asin'] = array('type' => 'varchar', 'length' => 32, 'not null' => FALSE);
      return $columns;

    case 'views data':
      $data = content_views_field_views_data($field);
      $db_info = content_database_info($field);
      $table_alias = content_views_tablename($field);

      // Swap the filter handler to the 'in' operator.
      $data[$table_alias][$field['field_name'] .'_asin']['filter']['handler'] = 'views_handler_filter_many_to_one_content';

      // Add a relationship for related node.
      $data[$table_alias][$field['field_name'] .'_asin']['relationship'] = array(
        'base' => 'amazon_item',
        'field' => $db_info['columns']['asin']['column'],
        'handler' => 'views_handler_relationship',
      );
      return $data;
  }
}

/**
 * Implementation of hook_field().
 */
function asin_field($op, &$node, $field, &$items, $teaser, $page) {
  switch ($op) {
    case 'validate':
      $results = _asin_load_items($items);
      foreach ($items as $delta => $item) {
        if (is_array($item)) {
          if (!empty($item['asin']) && empty($results[$item['asin']])) {
            form_set_error($field['field_name'] .']['. $delta .'][asin', t('%name : No Amazon product with the ID %id could be located.', array('%name' => t($field['widget']['label']), '%id' => $item['asin'])));
          }
        }
      }
      return $items;

    case 'load':
      $results = _asin_load_items($items);
      foreach ($items as $delta => $item) {
        if (!empty($item['asin'])) {
          $items[$delta] = $results[$item['asin']];
        }
      }
      return $items;
  }
}

function _asin_load_items($items) {
  $asins = array();
  foreach ($items as $delta => $item) {
    if (!empty($item['asin'])) {
      $asins[] = $item['asin'];
    }
  }
  return amazon_item_lookup($asins);
}

/**
 * Implementation of hook_content_is_empty().
 */
function asin_content_is_empty($item, $field) {
  if (empty($item['asin'])) {
    return TRUE;
  }
  return FALSE;
}

/**
 * Implementation of hook_field_formatter_info().
 */
function asin_field_formatter_info() {
  return array(
    'default' => array(
      'label' => t('Small image and basic info'),
      'field types' => array('asin'),
      'multiple values' => CONTENT_HANDLE_CORE,
    ),
    'details' => array(
      'label' => t('Small image and full info'),
      'field types' => array('asin'),
      'multiple values' => CONTENT_HANDLE_CORE,
    ),
	// added for Haris - start
    'fornodes' => array(
      'label' => t('Large image and full info'),
      'field types' => array('asin'),
      'multiple values' => CONTENT_HANDLE_CORE,
    ),
	// added for Haris - end
    'thumbnail' => array(
      'label' => t('Large image'),
      'field types' => array('asin'),
      'multiple values' => CONTENT_HANDLE_CORE,
    ),
    'inline' => array(
      'label' => t('Title as link'),
      'field types' => array('asin'),
      'multiple values' => CONTENT_HANDLE_CORE,
    ),
  );
}

/**
 * Theme function for 'default' asin field formatter, appropriate for
 * general use and product listings.
 */
function theme_asin_formatter_default($element) {
  if ($asin = $element['#item']['asin']) {
    $asins = amazon_item_lookup(array($asin));
    return theme('amazon_item', $asins[$asin]);
  }
}

/**
 * Theme function for 'thumbnail' asin field formatter, appropriate for
 * product hilighting and display.
 */
function theme_asin_formatter_thumbnail($element) {
  if ($asin = $element['#item']['asin']) {
    $asins = amazon_item_lookup(array($asin));
    return theme('amazon_item', $asins[$asin], 'thumbnail');
  }
}

/**
 * Theme function for 'full' asin field formatter, appropriate for
 * product hilighting and display.
 */
function theme_asin_formatter_details($element) {
  if ($asin = $element['#item']['asin']) {
    $asins = amazon_item_lookup(array($asin));
    return theme('amazon_item', $asins[$asin], 'details');
  }
}

	// added for Haris - start
/**
 * Theme function for 'fornodes' asin field formatter, appropriate for
 * product hilighting and display.
 */
function theme_asin_formatter_fornodes($element) {
  if ($asin = $element['#item']['asin']) {
    $asins = amazon_item_lookup(array($asin));
    return theme('amazon_item', $asins[$asin], 'fornodes');
  }
}
	// added for Haris - end
/**
 * Theme function for 'inline' asin field formatter, appropriate for
 * quick title lists, etc.
 */
function theme_asin_formatter_inline($element) {
  if ($asin = $element['#item']['asin']) {
    $asins = amazon_item_lookup(array($asin));
    return theme('amazon_inline_item', $asins[$asin]);
  }
}


/**
 * Implementation of hook_widget_info().
 *
 * We need custom handling of multiple values for the asin_text
 * widget because we need to combine them into a options list rather
 * than display multiple elements.
 *
 * We will use the content module's default handling for default value.
 *
 * Callbacks can be omitted if default handing is used.
 * They're included here just so this module can be used
 * as an example for custom modules that might do things
 * differently.
 */
function asin_widget_info() {
  return array(
    'asin_text' => array(
      'label' => t('Text field'),
      'field types' => array('asin'),
      'multiple values' => CONTENT_HANDLE_CORE,
      'callbacks' => array(
        'default value' => CONTENT_CALLBACK_DEFAULT,
      ),
    ),
    'asin_lookup' => array(
      'label' => t('Lookup by title'),
      'field types' => array('asin'),
      'multiple values' => CONTENT_HANDLE_CORE,
      'callbacks' => array(
        'default value' => CONTENT_CALLBACK_DEFAULT,
      ),
    ),
  );
}

/**
 * Implementation of FAPI hook_elements().
 *
 * Any FAPI callbacks needed for individual widgets can be declared here,
 * and the element will be passed to those callbacks for processing.
 *
 * Drupal will automatically theme the element using a theme with
 * the same name as the hook_elements key.
 */
function asin_elements() {
  return array(
    'asin_text' => array(
      '#input' => TRUE,
      '#process' => array('asin_text_process'),
    ),
    'asin_lookup' => array(
      '#input' => TRUE,
      '#process' => array('asin_lookup_process'),
    ),
  );
}

/**
 * Implementation of hook_widget().
 *
 * Attach a single form element to the form. It will be built out and
 * validated in the callback(s) listed in hook_elements. We build it
 * out in the callbacks rather than here in hook_widget so it can be
 * plugged into any module that can provide it with valid
 * $field information.
 *
 * Content module will set the weight, field name and delta values
 * for each form element. This is a change from earlier CCK versions
 * where the widget managed its own multiple values.
 *
 * If there are multiple values for this field, the content module will
 * call this function as many times as needed.
 *
 * @param $form
 *   the entire form array, $form['#node'] holds node information
 * @param $form_state
 *   the form_state, $form_state['values'][$field['field_name']]
 *   holds the field's form values.
 * @param $field
 *   the field array
 * @param $items
 *   array of default values for this field
 * @param $delta
 *   the order of this item in the array of subelements (0, 1, 2, etc)
 *
 * @return
 *   the form item for a single element for this field
 */
function asin_widget(&$form, &$form_state, $field, $items, $delta = 0) {
  $element = array(
    '#type' => $field['widget']['type'],
    '#default_value' => isset($items[$delta]) ? $items[$delta] : '',
  );
  return $element;
}

/**
 * Process an individual element.
 *
 * Build the form element. When creating a form using FAPI #process,
 * note that $element['#value'] is already set.
 *
 * The $fields array is in $form['#field_info'][$element['#field_name']].
 */
function asin_text_process($element, $edit, $form_state, $form) {
  $field = $form['#field_info'][$element['#field_name']];
  $delta = $element['#delta'];

  $asin_key = $element['#columns'][0];
  $element[$asin_key] = array(
    '#type' => 'textfield',
    '#title' => $element['#title'],
    '#description' => $element['#description'],
    '#required' => $element['#required'],
    '#default_value' => isset($element['#value'][$asin_key]) ? $element['#value'][$asin_key] : NULL,
  );
  return $element;
}


/**
 * Validate an select element.
 *
 * Remove the wrapper layer and set the right element's value.
 */
function asin_text_validate($element, &$form_state) {
  array_pop($element['#parents']);
  form_set_value($element, $form_state['values'][$element['#field_name']], $form_state);
}


function theme_asin_text($element) {
  drupal_add_css(drupal_get_path('module', 'asin') .'/asin.css', 'module', 'all', FALSE);
  $output = $element['#children'];
  if (!empty($element['#value']) && !empty($element['#value']['asin'])) {
    $asin = $element['#value']['asin'];
    if ($data = amazon_item_lookup(array($asin))) {
      $output .= '<p class="asin-edit-title">'. check_plain($data[$asin]['title']) .'</p>';
    }
  }
  return $output;
}


/**
 * Process an individual element.
 *
 * Build the form element. When creating a form using FAPI #process,
 * note that $element['#value'] is already set.
 *
 * The $fields array is in $form['#field_info'][$element['#field_name']].
 */
function asin_lookup_process($element, $edit, $form_state, $form) {
  $field = $form['#field_info'][$element['#field_name']];

  $asin_key = $element['#columns'][0];
  $element[$asin_key] = array(
    '#type' => 'hidden',
    '#required' => $element['#required'],
    '#default_value' => isset($element['#value'][$asin_key]) ? $element['#value'][$asin_key] : NULL,
    '#delta' => $element['#delta'],
  );

  $element[''] = array(
    '#type' => 'textfield',
    '#title' => $element['#title'],
    '#description' => $element['#description'],
    '#required' => $element['#required'],
    '#field_name' => $element['#field_name'],
    '#type_name' => $element['#type_name'],
  );

  // Used so that hook_field('validate') knows where to flag an error.
  $element['_error_element'] = array(
    '#type' => 'value',
    '#value' => implode('][', array_merge($element['#parents'], array($asin_key))),
  );

  return $element;
}


/**
 * Validate an select element.
 *
 * Remove the wrapper layer and set the right element's value.
 */
function asin_lookup_validate($element, &$form_state) {
  array_pop($element['#parents']);
  form_set_value($element, $form_state['values'][$element['#field_name']], $form_state);
}


function theme_asin_lookup($element) {
  drupal_add_css(drupal_get_path('module', 'asin') .'/asin.css', 'module', 'all', FALSE);
  $output = $element['#children'];
  if (!empty($element['#value']) && !empty($element['#value']['asin'])) {
    $asin = $element['#value']['asin'];
    if ($data = amazon_item_lookup(array($asin))) {
      $output .= '<p class="asin-edit-title">'. check_plain($data[$asin]['title']) .'</p>';
    }
  }
  return $output;
}