<?php


/**
 * Publishes content in Chado as a new TripalEntity entity.
 *
 * @param $values
 *   A key/value associative array that supports the following keys:
 *   - bundle_name:  The name of the the TripalBundle (e.g. bio_data-12345).
 * @param $job_id
 *   (Optional) The numeric job ID as provided by the Tripal jobs system. There
 *   is no need to specify this argument if this function is being called
 *   outside of the jobs systems.
 *
 * @return boolean
 *   TRUE if all of the records of the given bundle type were published, and
 *   FALSE if a failure occured.
 */
function tripal_chado_publish_records($values, $job_id = NULL) {

  // Make sure we have the required options: bundle_name.
  if (!array_key_exists('bundle_name', $values) or !$values['bundle_name']) {
    tripal_report_error('tripal_chado', TRIPAL_ERROR,
      "Could not publish record: @error",
      array('@error' => 'The bundle name must be provided'));
    return FALSE;
  }

  // Get the incoming arguments from the $values array.
  $bundle_name = $values['bundle_name'];
  $filters = array_key_exists('filters', $values) ? $values['filters'] : array();
  $sync_node = array_key_exists('sync_node', $values) ? $values['sync_node'] : '';

  // Load the bundle entity so we can get information about which Chado
  // table/field this entity belongs to.
  $bundle = tripal_load_bundle_entity(array('name' => $bundle_name));
  if (!$bundle) {
    tripal_report_error('tripal_chado', TRIPAL_ERROR,
        "Unknown bundle. Could not publish record: @error",
        array('@error' => 'The bundle name must be provided'));
    return FALSE;
  }
  $chado_entity_table = chado_get_bundle_entity_table($bundle);


  // Get the mapping of the bio data type to the Chado table.
  $chado_bundle = db_select('chado_bundle', 'cb')
    ->fields('cb')
    ->condition('bundle_id', $bundle->id)
    ->execute()
    ->fetchObject();
  if(!$chado_bundle) {
    tripal_report_error('tripal_chado', TRIPAL_ERROR,
        "Cannot find mapping of bundle to Chado tables. Could not publish record.");
    return FALSE;
  }

  $table = $chado_bundle->data_table;
  $type_column = $chado_bundle->type_column;
  $type_linker_table = $chado_bundle->type_linker_table;
  $cvterm_id  = $chado_bundle->type_id;
  $type_value = $chado_bundle->type_value;

  // Get the table information for the Chado table.
  $table_schema = chado_get_schema($table);
  $pkey_field = $table_schema['primary key'][0];

  // Construct the SQL for identifying which records should be published.
  $args = array();
  $select = "SELECT T.$pkey_field as record_id ";
  $from = "
    FROM {" . $table . "} T
      LEFT JOIN public.$chado_entity_table CE on CE.record_id = T.$pkey_field
  ";

  // For migration of Tripal v2 nodes to entities we want to include the
  // coresponding chado linker table.
  if ($sync_node && db_table_exists('chado_' . $table)) {
    $select = "SELECT T.$pkey_field as record_id, CT.nid ";
    $from .= " INNER JOIN public.chado_$table CT ON CT.$pkey_field = T.$pkey_field";
  }
  $where = " WHERE CE.record_id IS NULL ";

  // Handle records that are mapped to property tables.
  if ($type_linker_table and $type_column and $type_value) {
    $propschema = chado_get_schema($type_linker_table);
    $fkeys = $propschema['foreign keys'][$table]['columns'];
    foreach ($fkeys as $leftkey => $rightkey) {
      if ($rightkey == $pkey_field) {
        $from .= " INNER JOIN {" . $type_linker_table . "} LT ON T.$pkey_field = LT.$leftkey ";
      }
    }
    $where .= "AND LT.$type_column = :cvterm_id and LT.value = :prop_value";
    $args[':cvterm_id'] = $cvterm_id;
    $args[':prop_value'] = $type_value;
  }

  // Handle records that are mapped to cvterm linking tables.
  if ($type_linker_table and $type_column and !$type_value) {
    $cvtschema = chado_get_schema($type_linker_table);
    $fkeys = $cvtschema['foreign keys'][$table]['columns'];
    foreach ($fkeys as $leftkey => $rightkey) {
      if ($rightkey == $pkey_field) {
        $from .= " INNER JOIN {" . $type_linker_table . "} LT ON T.$pkey_field = LT.$leftkey ";
      }
    }
    $where .= "AND LT.$type_column = :cvterm_id";
    $args[':cvterm_id'] = $cvterm_id;
  }

  // Handle records that are mapped via a type_id column in the base table.
  if (!$type_linker_table and $type_column) {
    $where .= "AND T.$type_column = :cvterm_id";
    $args[':cvterm_id'] = $cvterm_id;
  }

  // Handle the case where records are in the cvterm table and mapped via a single
  // vocab.  Here we use the type_value for the cv_id.
  if ($table == 'cvterm' and $type_value) {
    $where .= "AND T.cv_id = :cv_id";
    $args[':cv_id'] = $type_value;
  }

  // Handle the case where records are in the cvterm table but we want to
  // use all of the child terms.
  if ($table == 'cvterm' and !$type_value) {
    $where .= "AND T.cvterm_id IN (
       SELECT CVTP.subject_id
       FROM {cvtermpath} CVTP
       WHERE CVTP.object_id = :cvterm_id)
     ";
    $args[':cvterm_id'] = $cvterm_id;
  }

  // Now add in any additional filters
  $fields = field_info_field_map();
  foreach ($fields as $field_name => $details) {
    if (array_key_exists('TripalEntity', $details['bundles']) and
        in_array($bundle_name, $details['bundles']['TripalEntity']) and
        in_array($field_name, array_keys($filters))){
      $instance = field_info_instance('TripalEntity', $field_name, $bundle_name);
      $chado_table = $instance['settings']['chado_table'];
      $chado_column = $instance['settings']['chado_column'];
      if ($chado_table == $table) {
        $where .= " AND T.$chado_column = :$field_name";
        $args[":$field_name"] = $filters[$field_name];
      }
    }
  }
  // First get the count
  $sql = "SELECT count(*) as num_records " . $from . $where;
  $result = chado_query($sql, $args);
  $count = $result->fetchField();

  // calculate the interval for updates
  $interval = intval($count / 1000);
  if ($interval < 1) {
    $interval = 1;
  }

  // Perform the query.
  $sql = $select . $from . $where;
  $records = chado_query($sql, $args);
  $transaction = db_transaction();

  print "\nNOTE: publishing records is performed using a database transaction. \n" .
      "If the load fails or is terminated prematurely then the entire set of \n" .
      "is rolled back with no changes to the database\n\n";

  printf("%d of %d records. (%0.2f%%) Memory: %s bytes\r", $i, $count, 0, number_format(memory_get_usage()));
  try {
    $i = 0;
    while($record = $records->fetchObject()) {

      // update the job status every interval
      //if ($jobid and $i % $interval == 0) {
        $complete = ($i / $count) * 33.33333333;
        //tripal_set_job_progress($jobid, intval($complete + 33.33333333));
        printf("%d of %d records. (%0.2f%%) Memory: %s bytes\r", $i, $count, $complete * 3, number_format(memory_get_usage()));
      //}

      // First save the tripal_entity record.
      $record_id = $record->record_id;
      $ec = entity_get_controller('TripalEntity');
      $entity = $ec->create(array(
        'bundle' => $bundle_name,
        'term_id' => $bundle->term_id,
        // Add in the Chaod details for when the hook_entity_create()
        // is called and our tripal_cahdo_entity_create() implementation
        // can deal with it.
        'chado_record' => chado_generate_var($table, array($pkey_field => $record_id)),
        'chado_record_id' => $record_id,
      ));
      $entity = $entity->save();
      if (!$entity) {
        throw new Exception('Could not create entity.');
      }

      // Next save the chado entity record.
      $entity_record = array(
        'entity_id' => $entity->id,
        'record_id' => $record_id,
      );

      // For the Tv2 to Tv3 migration we want to add the nid to the
      // entity so we can associate the node with the entity.
      if (property_exists($record, 'nid')) {
        $entity_record['nid'] = $record->nid;
      }
      $result = db_insert($chado_entity_table)
        ->fields($entity_record)
        ->execute();
      if(!$result){
        throw new Exception('Could not create mapping of entity to Chado record.');
      }

      $i++;
    }
  }
  catch (Exception $e) {
    $transaction->rollback();
    $error = $e->getMessage();
    tripal_report_error('tripal_chado', TRIPAL_ERROR, "Could not publish record: @error", array('@error' => $error));
    drupal_set_message('Failed publishing record. See recent logs for more details.', 'error');
    return FALSE;
  }
  drupal_set_message("Succesfully published $i " . $bundle->label . " record(s).");
  return TRUE;
}

/**
 * Returns an array of tokens based on Tripal Entity Fields.
 *
 * @param $base_table
 *    The name of a base table in Chado.
 * @return
 *    An array of tokens where the key is the machine_name of the token.
 */
function tripal_get_chado_tokens($base_table) {

  $tokens = array();
  $table_descrip = chado_get_schema($base_table);
  foreach ($table_descrip['fields'] as $field_name => $field_details) {

    $token = '[' . $base_table . '.' . $field_name . ']';
    $location = implode(' > ',array($base_table, $field_name));

    $tokens[$token] = array(
      'name' => ucwords(str_replace('_',' ',$base_table)) . ': ' . ucwords(str_replace('_',' ',$field_name)),
      'table' => $base_table,
      'field' => $field_name,
      'token' => $token,
      'description' => array_key_exists('description', $field_details) ? $field_details['description'] : '',
      'location' => $location
    );

    if (!array_key_exists('description', $field_details) or preg_match('/TODO/',$field_details['description'])) {
      $tokens[$token]['description'] = 'The '.$field_name.' field of the '.$base_table.' table.';
    }
  }

  // RECURSION:
  // Follow the foreign key relationships recursively
  if (array_key_exists('foreign keys', $table_descrip)) {
    foreach ($table_descrip['foreign keys'] as $table => $details) {
      foreach ($details['columns'] as $left_field => $right_field) {

        $sub_token_prefix = $base_table . '.' . $left_field;
        $sub_location_prefix = implode(' > ',array($base_table, $left_field));

        $sub_tokens = tripal_get_chado_tokens($table);
        if (is_array($sub_tokens)) {
          $tokens = array_merge($tokens, $sub_tokens);
        }
      }
    }
  }

  return $tokens;
}

/**
 * Replace all Chado Tokens in a given string.
 *
 * NOTE: If there is no value for a token then the token is removed.
 *
 * @param string $string
 *   The string containing tokens.
 * @param $record
 *   A Chado record as generated by chado_generate_var()
 *
 * @return
 *   The string will all tokens replaced with values.
 */
function tripal_replace_chado_tokens($string, $record) {
  // Get the list of tokens
  $tokens = tripal_get_chado_tokens($record->tablename);

  // Determine which tokens were used in the format string
  if (preg_match_all('/\[[^]]+\]/', $string, $used_tokens)) {
    // Get the value for each token used
    foreach ($used_tokens[0] as $token) {
      $token_info = $tokens[$token];
      if (!empty($token_info)) {
        $table = $token_info['table'];
        $var = $record;
        $value = '';

        // Iterate through each portion of the location string. An example string
        // might be:  stock > type_id > name.
        $location = explode('>', $token_info['location']);
        foreach ($location as $index) {
          $index = trim($index);

          // if $var is an object then it is the $node object or a table
          // that has been expanded.
          if (is_object($var)) {
            // check to see if the index is a member of the object. If so,
            // then reset the $var to this value.
            if (property_exists($var, $index)) {
              $value = $var->$index;
            }
          }
          // if the $var is an array then there are multiple instances of the same
          // table in a FK relationship (e.g. relationship tables)
          elseif (is_array($var)) {
            $value = $var[$index];
          }
          else {
            tripal_report_error('tripal_chado', TRIPAL_WARNING,
              'Tokens: Unable to determine the value of %token. Things went awry when trying ' .
              'to access \'%index\' for the following: \'%var\'.',
              array('%token' => $token, '%index' => $index, '%var' => print_r($var,TRUE))
            );
          }
        }
        $string = str_replace($token, $value, $string);
      }
    }
  }
  return $string;
}

/**
 * Retrieve an entity_id for a chado record.
 *
 * @param string $chado_table
 *   The chado_table where the record is stored.
 * @param integer $record_id
 *   The record_id which is the primary key of the chado table.
 *
 * @return
 *   Return an integer representing the entity_id or NULL if not found. The
 *   record is then accessible on the website through URL /bio_data/<entity_id>
 */
function tripal_get_chado_entity_id ($chado_table, $record_id) {
  // To find the bundle_table, check if type_column is used for the chado table.
  $type_column =
    db_select('chado_bundle', 'CB')
    ->fields('CB', array('type_column'))
    ->condition('data_table', $chado_table)
    ->execute()
    ->fetchField();

  // If there is a type_column, get bundle_id by specifying the data_table,
  // type_column, and type_id.
  $bundle_id = NULL;
  if ($type_column) {
    $schema = chado_get_schema($chado_table);
    $pkey = is_array($schema['primary key']) ? $schema['primary key'][0] : $schema['primary key'];
    $type_id = NULL;
    if (key_exists($type_column, $schema['fields'])) {
      $type_id =
        chado_db_select($chado_table, 'C')
          ->fields('C', array($type_column))
          ->condition($pkey, $record_id)
          ->execute()
          ->fetchField();
    }
    if ($type_id) {
      $bundle_id =
        db_select('chado_bundle', 'CB')
          ->fields('CB', array('bundle_id'))
          ->condition('data_table', $chado_table)
          ->condition('type_column', $type_column)
          ->condition('type_id', $type_id)
          ->execute()
          ->fetchField();
    }
  }
  // If type_column is not used, get bundle_id by specifying the data_table.
  else {
    $bundle_id =
      db_select('chado_bundle', 'CB')
        ->fields('CB', array('bundle_id'))
        ->condition('data_table', $chado_table)
        ->execute()
        ->fetchField();
  }

  // If bundle_id is found, find the bundle table name and return the entity_id.
  $entity_id = NULL;
  if ($bundle_id) {
    $table_name =
      db_select('tripal_bundle', 'TB')
        ->fields('TB', array('name'))
        ->condition('id', $bundle_id)
        ->execute()
        ->fetchField();
    $entity_id =
      db_select('chado_' . $table_name, 'CBD')
        ->fields('CBD', array('entity_id'))
        ->condition('record_id', $record_id)
        ->execute()
        ->fetchField();
  }
  return $entity_id;
}
