<?php
namespace uarsoftware\ebook\extractor;
/**
 * @copyright Copyright Up and Running
 */


/**
 *
 * Handles tag replacement in a list of files passed in
 *
 * @since March, 25th, 2014
 * @author Pete Hanson <peteh@upandrunningsoftware.com>
 *
 */
class TextReplacement
{

    private $_files;
    private $_tags;
    private $_num_replacements;

    /**
     * Constructor, takes in files to be processed.
     *
     * @param $file_list
     */
    public function __construct($file_list)
    {
        $this->_files = $file_list;
    }

    /**
     * Add a tag pattern and it's replacement value and store those as the tags to replace.
     *
     * @param $tag
     * @param $replaceValue
     */
    public function addTag($tag, $replaceValue)
    {
        $this->_tags[$tag] = $replaceValue;
    }

    /**
     * Iterates through the files and replaces all the found tags with their replacement values.
     *
     * @return bool|int
     */
    public function replaceTags()
    {
        $files = $this->_files;

        $num = 0;
        foreach ($files as $file) {
            if (is_file($file)) {
                $content = file_get_contents($file);
            } else {
                return false;
            }

            $count = 0;
            $content = str_replace(array_keys($this->_tags), array_values($this->_tags), $content, $count);
            $num += $count;

            $bytes_written = file_put_contents($file, $content);

            if ($bytes_written === false) {
                return false;
            }
        }

        $this->_num_replacements = $num;
        return $num;
    }

    /**
     * Returns the number replacements made.
     *
     * @return mixed
     */
    public function getNumberOfReplacements()
    {
        return $this->_num_replacements;
    }

}

?>