marcojetson/tummy

<?php

namespace Tummy;

class Composer
{
    /** @param Config\Format */
    protected $format;

    /**
     * @param Config\Format $format
     */
    public function __construct($format)
    {
        $this->format = $format;
    }

    /**
     * @param object[] $records
     * @return string[]
     */
    public function compose(array $records)
    {
        return array_map([$this, 'composeLine'], $records);
    }

    /**
     * @param object $record
     * @return string
     * @throws Exception\RequiredException
     */
    public function composeLine($record)
    {
        $recordMapper = $this->format->getRecordMapper();
        $line = '';

        foreach ($this->format->getElements() as $element) {
            $reference = $element->getReference();
            $value = $reference === null ? '' : $recordMapper->get($record, $reference);

            $converter = $element->getConverter();
            if ($converter !== null) {
                $value = $converter->serialize($value);
            }

            $value = (string)$value;

            if ($element->isRequired() && $value === '') {
                throw new Exception\RequiredException(sprintf('Required element "%s" is empty', $reference));
            }

            $line .= $this->pad($value, $element);
        }

        return $line;
    }

    /**
     * @param string $value
     * @param Config\Element $element
     * @return string
     */
    protected function pad($value, Config\Element $element)
    {
        $value = mb_substr($value, 0, $element->getLength());
        $length = strlen($value) - mb_strlen($value) + $element->getLength();

        return str_pad($value, $length, $element->getPaddingChar(), $element->getPaddingDirection());
    }
}