<?php

namespace DbCopy\Transform;

class ValueMap extends Transform
{
	private $_map;

	public function __construct(array $map)
	{
		$this->_map = $map;
	}

	public static function create(array $map): ValueMap
	{
		return new ValueMap($map);
	}

	public function __invoke($record): ?array
	{
		foreach ($this->_map as $field=>$values)
		{
			if (isset($record[$field]) && isset($values[$record[$field]]))
			{
				$record[$field] = $values[$record[$field]];
			}
		}
		return $record;
	}
}