<?php

class chado_linker__contact extends ChadoField {


  // --------------------------------------------------------------------------
  //                     EDITABLE STATIC CONSTANTS
  //
  // The following constants SHOULD be set for each descendent class.  They are
  // used by the static functions to provide information to Drupal about
  // the field and it's default widget and formatter.
  // --------------------------------------------------------------------------

  // The default lable for this field.
  public static $default_label = 'Contacts';

  // The default description for this field.
  public static $description = 'Associates an indviddual or organization with
          this record';

  // Provide a list of instance specific settings. These can be access within
  // the instanceSettingsForm.  When the instanceSettingsForm is submitted
  // then Drupal with automatically change these settings for the instnace.
  // It is recommended to put settings at the instance level whenever possible.
  // If you override this variable in a child class be sure to replicate the
  // term_name, term_vocab, term_accession and term_fixed keys as these are
  // required for all TripalFields.
  public static $default_instance_settings  = array(
    // The short name for the vocabulary (e.g. shcema, SO, GO, PATO, etc.).
    'term_vocabulary' => 'local',
    // The name of the term.
    'term_name' => 'contact',
    // The unique ID (i.e. accession) of the term.
    'term_accession' => 'contact',
    // Set to TRUE if the site admin is allowed to change the term
    // type. This will create form elements when editing the field instance
    // to allow the site admin to change the term settings above.
    'term_fixed' => FALSE,
  );


  // The default widget for this field.
  public static $default_widget = 'chado_linker__contact_widget';

  // The default formatter for this field.
  public static $default_formatter = 'chado_linker__contact_formatter';

  // --------------------------------------------------------------------------
  //              PROTECTED CLASS MEMBERS -- DO NOT OVERRIDE
  // --------------------------------------------------------------------------
  // An array containing details about the field. The format of this array
  // is the same as that returned by field_info_fields()
  protected $field;
  // An array containing details about an instance of the field. A field does
  // not have to have an instance.  But if dealing with an instance (such as
  // when using the widgetForm, formatterSettingsForm, etc.) it should be set.
  protected $instance;



  /**
   *
   * @see TripalField::load()
   */
  public function load($entity) {
    $record = $entity->chado_record;

    $field_name = $this->field['field_name'];
    $field_type = $this->field['type'];
    $field_table = $this->instance['settings']['chado_table'];
    $field_column = $this->instance['settings']['chado_column'];

    // Get the FK that links to the base record.
    $schema = chado_get_schema($field_table);
    $base_table = $entity->chado_table;
    $pkey = $schema['primary key'][0];
    if (!isset($schema['foreign keys'][$base_table]['columns'])) {
      return;
    }
    $fkey_lcolumn = key($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' => array(),
      'chado-' . $field_table . '__' . $pkey => '',
      'chado-' . $field_table . '__' . $fkey_lcolumn => '',
      'chado-' . $field_table . '__' . 'contact_id' => '',
      // Ignore the synonym_sgml column for now.
    );

    $linker_table = $base_table . '_contact';
    $options = array(
      'return_array' => 1,
      'include_fk' => array(
        'contact_id' => array(
          'type_id' => array(
            'dbxref_id' => array(
              'db_id' => TRUE,
            ),
          ),
        ),
        $fkey_lcolumn => TRUE,
      ),
    );
    $record = chado_expand_var($record, 'table', $linker_table, $options);
    $contact_linkers = $record->$linker_table;
    if ($contact_linkers) {
      foreach ($contact_linkers as $i => $contact_linker) {
        $contact = $contact_linker->contact_id;
        $entity->{$field_name}['und'][$i] = array(
          'value' => array(
            'type' => $contact->type_id ? $contact->type_id->name : '',
            'name' => $contact->name,
            'description' => $contact->description,
          ),
          // Add in the semantic web settings.  This array is expected by
          // other Tripal modules that handle semantic web for fields.
          'semantic_web' => array(
            'type' => $contact->type_id ? $contact->type_id->dbxref_id->db_id->name . ':' . $contact->type_id->dbxref_id->accession : '',
            'name' => tripal_get_chado_semweb_term('contact', 'name'),
            'description' => tripal_get_chado_semweb_term('contact', 'description'),
          ),
          // Add in subfield mapping to Chado tables. This is used by the
          // chado_field_storage for performing queries on sub element values.
          // It should be a comma-separated list (no spacing) of the field names
          // as foreign keys are followed starting from the Chado table to which
          // this field maps.
          'chado_mapping' => array(
            'type' => 'type_id,name',
            'name' => 'contact_id,name',
            'description' => 'contact_id,name'
          ),
          'chado-' . $field_table . '__' . $pkey => $contact_linker->$pkey,
          'chado-' . $field_table . '__' . $fkey_lcolumn => $contact_linker->$fkey_lcolumn->$fkey_lcolumn,
          'chado-' . $field_table . '__' . 'contact_id' => $contact->contact_id
        );

        if (property_exists($contact, 'entity_id')) {
          $entity->{$field_name}['und'][$i]['value']['entity'] = 'TripalEntity:' . $contact->entity_id;
        }
      }
    }
  }

  /**
   * @see ChadoField::query()
   */
  public function query($query, $condition) {
    $contact_linker = $this->instance['settings']['chado_table'];
    $base_table = $this->instance['settings']['base_table'];
    $bschema = chado_get_schema($base_table);
    $bpkey = $bschema['primary key'][0];
    $alias = 'contact_linker';
    $operator = $condition['operator'];

    if ($condition['column'] == 'contact.name') {
      $query->join($contact_linker, $alias, "base.$bpkey = $alias.$bpkey");
      $query->join('contact', 'C', "C.contact_id = $alias.contact_id");
      $query->condition("C.name", $condition['value'], $operator);
    }
    if ($condition['column'] == 'contact.type') {

    }
  }
}

/**
 * An Ajax callback for the pub widget.
 */
function chado_linker__contact_widget_form_ajax_callback($form, $form_state) {

  $field_name = $form_state['triggering_element']['#parents'][0];
  $delta = $form_state['triggering_element']['#parents'][2];

  return $form[$field_name]['und'][$delta];
}
/**
 * Theme function for the pub widget.
 *
 * @param $variables
 */
function theme_chado_linker__contact_widget($variables) {
  $element = $variables['element'];

  // These two fields were added to the widget to help identify the fields
  // for layout.
  $table_name = $element['#table_name'];
  $fkey = $element['#fkey_field'];

  $layout = "
      <div class=\"pub-widget\">
        <div class=\"pub-widget-item\">" .
        drupal_render($element['name']) . "
        </div>
      </div>
    ";

        return $layout;
}