<?php
/**
 * Implements hook_info() for fields.
 *
 * This is a hook provided by the tripal_chado module for offloading the
 * hook_field_info() hook for each field to specify.
 */
function chado_linker__prop_info() {
  return array(
    'label' => t('Add a Property'),
    'description' => t('Add details about this property.'),
    'default_widget' => 'chado_linker__prop_widget',
    'default_formatter' => 'chado_linker__prop_formatter',
    'settings' => array(),
    'storage' => array(
      'type' => 'field_chado_storage',
      'module' => 'tripal_chado',
      'active' => TRUE
    ),
  );
}
/**
 * Implements hook_attach_info().
 *
 * This is a hook provided by the tripal_Chado module. It allows the field
 * to specify which bundles it will attach to and to specify thee settings.
 *
 * @param $entity_type
 * @param $entity
 * @param $term
 *
 * @return
 *   A field array
 */
function chado_linker__prop_attach_info($entity_type, $bundle, $target) {
  $field_info = array();

  // This field is only attached by the chado_linker__prop_addr field.

  return $field_info;
}
/**
 * Implements hook_widget_info.
 *
 * This is a hook provided by the tripal_chado module for offloading
 * the hook_field_widget_info() hook for each field to specify.
 */
function chado_linker__prop_widget_info() {
  return array(
    'label' => t('Property'),
    'field types' => array('chado_linker__prop'),
  );
}
/**
 * Implements hook_formatter_info.
 *
 * This is a hook provided by the tripal_chado module for
 * offloading the hook_field_formatter_info() for each field
 * to specify.
 *
 */
function chado_linker__prop_formatter_info() {
  return array(
    'label' => t('Property'),
    'field types' => array('chado_linker__prop'),
    'settings' => array(
    ),
  );
}
/**
 *
 * @param unknown $entity_type
 * @param unknown $entity
 * @param unknown $field
 * @param unknown $instance
 * @param unknown $langcode
 * @param unknown $items
 * @param unknown $display
 */
function chado_linker__prop_formatter(&$element, $entity_type, $entity, $field,
  $instance, $langcode, $items, $display) {

  $field_name = $field['field_name'];
  $chado_table = $field['settings']['chado_table'];

  $properties = array();
  foreach ($items as $delta => $item) {
    $properties[] = $item[$chado_table . '__value'];
  }
  $content = implode(', ', $properties);
  $element[$delta] = array(
    '#type' => 'markup',
    '#markup' => $content,
  );
}
/**
 *
 * @param unknown $field_name
 * @param unknown $widget
 * @param unknown $form
 * @param unknown $form_state
 * @param unknown $field
 * @param unknown $instance
 * @param unknown $langcode
 * @param unknown $items
 * @param unknown $delta
 * @param unknown $element
 */
function chado_linker__prop_widget(&$widget, $form, $form_state, $field, $instance, $langcode, $items, $delta, $element) {
  $entity = $form['#entity'];
  $field_name = $field['field_name'];

  // Get the record and table mapping info.
  $chado_table = $entity->chado_table;
  $chado_column = $entity->chado_column;
  $chado_record = $entity->chado_record;

  $matches = array();
  preg_match('/(.*?)__(\d+)/', $field_name, $matches);
  // If the field name is not properly formatted then we can't tell what
  // table and type this is.  So just return.
  if (count($matches) != 3) {
    return $widget;
  }
  $table_name = $matches[1];
  $cvterm_id = $matches[2];

  // Get the name of the pkey field for this property table and the name
  // of the FK field that links to the base table.
  $schema = chado_get_schema($table_name);
  $pkey = $schema['primary key'][0];
  $lfkey_field = key($schema['foreign keys'][$chado_table]['columns']);
  $rfkey_field = $schema['foreign keys'][$chado_table]['columns'][$lfkey_field];

  // Get the field defaults.
  $fk_value = '';
  $propval = '';
  if (array_key_exists($delta, $items)) {
    $propval = $items[$delta][$table_name . '__value'];
  }
  if ($chado_record) {
    $fk_value = $chado_record->$rfkey_field;
  }


  // The group of elements all-together need some extra functionality
  // after building up the full list (like draggable table rows).
  $widget['#theme'] = 'field_multiple_value_form';
  $widget['#title'] = $element['#title'];
  $widget['#description'] = $element['#description'];
  $widget['#field_name'] = $element['#field_name'];
  $widget['#language'] = $element['#language'];
  $widget['#weight'] = isset($element['#weight']) ? $element['#weight'] : 0;
  $widget['#element_validate'] = array('chado_linker__prop_widget_validate');
  $widget['#cardinality'] = 1;

  $widget['value'] = array(
    '#type' => 'hidden',
    '#default_value' => !empty($items[$delta]['value']) ? $items[$delta]['value'] : '',
  );
  $widget[$table_name . '__' . $lfkey_field] = array(
    '#type' => 'hidden',
    '#value' => $fk_value,
  );
  $widget[$table_name . '__value'] = array(
    '#type' => 'textfield',
    '#default_value' => $propval,
  );
  $widget[$table_name . '__type_id'] = array(
    '#type' => 'hidden',
    '#value' => $cvterm_id,
  );
  $widget[$table_name . '__rank'] = array(
    '#type' => 'hidden',
    '#value' => $delta,
  );
  return $widget;
}

/**
 *
 * @param unknown $form
 * @param unknown $form_state
 */
function chado_linker__prop_widget_form_ajax_callback($form, $form_state) {
  $field_name = $form_state['triggering_element']['#parents'][0];
  return $form[$field_name];
}
/**
 * Callback function for validating the chado_linker__prop_widget.
 */
function chado_linker__prop_widget_validate($element, &$form_state) {
  $field_name = $element['#field_name'];
  $delta = $element['#delta'];
  $entity = $element['#entity'];
  $matches = array();

  // Get the record and table mapping info.
  $chado_table = $entity->chado_table;
  $chado_column = $entity->chado_column;

  // Get the table name and cvterm_id for this field.
  preg_match('/(.*?)__(\d+)/', $field_name, $matches);
  $table_name = $matches[1];
  $cvterm_id = $matches[2];

  // Get the name of the pkey field for this property table and the name
  // of the FK field that links to the base table.
  $schema = chado_get_schema($table_name);
  $pkey = $schema['primary key'][0];
  $lfkey_field = key($schema['foreign keys'][$chado_table]['columns']);

  // If we don't have a property value then we need to set all other fields
  // to be empty so that when the module tries to save the field on the
  // entity it won't try to save a partial record.
  $pkey_val = tripal_chado_get_field_form_values($field_name, $form_state, $delta);
  $prop_value = tripal_chado_get_field_form_values($field_name, $form_state, $delta, $table_name . "__value");
  $fk_val = tripal_chado_get_field_form_values($field_name, $form_state, $delta, $table_name . '__' . $lfkey_field);
  $type_id = tripal_chado_get_field_form_values($field_name, $form_state, $delta, $table_name . '__type_id');

  if (!$prop_value) {
    tripal_chado_set_field_form_values($field_name, $form_state, '', $delta);
    tripal_chado_set_field_form_values($field_name, $form_state, '', $delta, $table_name . '__' . $lfkey_field);
    tripal_chado_set_field_form_values($field_name, $form_state, '', $delta, $table_name . '__value');
    tripal_chado_set_field_form_values($field_name, $form_state, '', $delta, $table_name . '__type_id');
    tripal_chado_set_field_form_values($field_name, $form_state, '', $delta, $table_name . '__rank');
  }
  else {
    $rank = tripal_chado_get_field_form_values($field_name, $form_state, $delta, '_weight');
    tripal_chado_set_field_form_values($field_name, $form_state, $rank, $delta, $table_name . '__rank');
  }
  // Remove the properties for this record. We will re-add it. Otherwise,
  // if we change ranks, we wind up with multiple records in the property table.
  if ($pkey_val) {
    $match = array(
      $pkey => $pkey_val
    );
    chado_delete_record($table_name, $match);
  }
}
/**
 * Callback function for submitting the chado_linker__prop_widget.
 */
function chado_linker__prop_widget_submit($element, &$form_state) {
}

/**
 * Loads the field values with appropriate data.
 *
 * This function is called by the tripal_chado_field_storage_load() for
 * each property managed by the field_chado_storage storage type.  This is
 * an optional hook function that is only needed if the field has
 * multiple form elements.
 *
 * @param $field
 * @param $entity
 * @param $base_table
 * @param $record
 */
function chado_linker__prop_load($field, $entity, $base_table, $record) {

  $field_name = $field['field_name'];
  $field_type = $field['type'];
  $field_table = $field['settings']['chado_table'];
  $field_column = $field['settings']['chado_column'];

  $matches = array();
  preg_match('/(.*?)__(\d+)/', $field_name, $matches);
  $table_name = $matches[1];
  $cvterm_id = $matches[2];

  // Get the FK that links to the base record.
  $schema = chado_get_schema($field_table);
  $pkey = $schema['primary key'][0];
  $fkey_lcolumn = key($schema['foreign keys'][$base_table]['columns']);
  $fkey_rcolumn = $schema['foreign keys'][$base_table]['columns'][$fkey_lcolumn];

  // Set some defaults for the empty record.
  $entity->{$field_name}['und'][0] = array(
    'value' => '',
    $field_table . '__' . $fkey_lcolumn => '',
    $field_table . '__value' => '',
    $field_table . '__type_id' => '',
    $field_table . '__rank' => '',
  );

  // Get the properties associated with this base record for this fields
  // given type.
  $columns = array('*');
  $match = array(
    $fkey_lcolumn => $record->$fkey_rcolumn,
    'type_id' => $cvterm_id,
  );
  $options = array(
    'return_array' => TRUE,
    'order_by' => array('rank' => 'ASC')
  );
  $properties = chado_select_record($field_table, $columns, $match, $options);
  for ($i = 0; $i < count($properties); $i++) {
    $property = $properties[$i];
    foreach ($schema['fields'] as $fname => $details) {
      $entity->{$field_name}['und'][$i] = array(
        'value' => $property->$pkey,
        $field_table . '__' . $fkey_lcolumn => $property->$fkey_lcolumn,
        $field_table . '__value' => $property->value,
        $field_table . '__type_id' => $property->type_id,
        $field_table . '__rank' => $property->rank,
      );
    }
  }
}