class PostgresqlDateSql

class PostgresqlDateSql implements DateSqlInterface {
    use DependencySerializationTrait;
    
    /**
     * The database connection.
     *
     * @var \Drupal\Core\Database\Connection
     */
    protected $database;
    
    /**
     * An array of PHP-to-PostgreSQL replacement patterns.
     *
     * @var array
     */
    protected static $replace = [
        'Y' => 'YYYY',
        'y' => 'YY',
        'M' => 'Mon',
        'm' => 'MM',
        // No format for Numeric representation of a month, without leading zeros.
'n' => 'MM',
        'F' => 'Month',
        'D' => 'Dy',
        'd' => 'DD',
        'l' => 'Day',
        // No format for Day of the month without leading zeros.
'j' => 'DD',
        'W' => 'IW',
        'H' => 'HH24',
        'h' => 'HH12',
        'i' => 'MI',
        's' => 'SS',
        'A' => 'AM',
    ];
    
    /**
     * Constructs the PostgreSQL-specific date sql class.
     *
     * @param \Drupal\Core\Database\Connection $database
     *   The database connection.
     */
    public function __construct(Connection $database) {
        $this->database = $database;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDateField($field, $string_date) {
        if ($string_date) {
            // Ensures compatibility with field offset operation below.
            return "TO_TIMESTAMP({$field}, 'YYYY-MM-DD\"T\"HH24:MI:SS')";
        }
        return "TO_TIMESTAMP({$field})";
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDateFormat($field, $format) {
        $format = strtr($format, static::$replace);
        return "TO_CHAR({$field}, '{$format}')";
    }
    
    /**
     * {@inheritdoc}
     */
    public function setFieldTimezoneOffset(&$field, $offset) {
        $field = "({$field} + INTERVAL '{$offset} SECONDS')";
    }
    
    /**
     * {@inheritdoc}
     */
    public function setTimezoneOffset($offset) {
        $this->database
            ->query("SET TIME ZONE INTERVAL '{$offset}' HOUR TO MINUTE");
    }

}