<?php

namespace Blacklight;

use Blacklight\db\DB;

/**
 * Cleans names for collections/imports/namefixer.
 *
 * Class CollectionsCleaning
 */
class CollectionsCleaning
{
    /**
     * Used for matching endings in article subjects.
     * @const
     * @string
     */
    const REGEX_END = '[-_\s]{0,3}yEnc$/ui';

    /**
     * Used for matching file extension endings in article subjects.
     * @const
     * @string
     */
    const REGEX_FILE_EXTENSIONS = '([-_](proof|sample|thumbs?))*(\.part\d*(\.rar)?|\.rar|\.7z)?(\d{1,3}\.rev"|\.vol\d+\+\d+.+?"|\.[A-Za-z0-9]{2,4}"|")';

    /**
     * Used for matching size strings in article subjects.
     * @example ' - 365.15 KB - '
     * @const
     * @string
     */
    const REGEX_SUBJECT_SIZE = '[-_\s]{0,3}\d+([.,]\d+)? [kKmMgG][bB][-_\s]{0,3}';

    /**
     * Collection subject failed to match any regular expression.
     */
    const REGEX_NO_MATCH = 0;

    /**
     * Collection subject matched the Generic regular expression.
     */
    const REGEX_GENERIC_MATCH = -10;

    /**
     * Collection subject matched the Music generic regular expression.
     */
    const REGEX_MUSIC_MATCH = -20;

    /**
     * @var string
     */
    public $e0;

    /**
     * @var string
     */
    public $e1;

    /**
     * @var string
     */
    public $e2;

    /**
     * @var string
     */
    public $groupName = '';

    /**
     * @var string
     */
    public $subject = '';

    /**
     * @var \Blacklight\db\DB
     */
    public $pdo;

    /**
     * @var \Blacklight\Regexes
     */
    protected $_regexes;

    /**
     * @param array $options Class instances.
     * @throws \Exception
     */
    public function __construct(array $options = [])
    {
        // Extensions.
        $this->e0 = self::REGEX_FILE_EXTENSIONS;
        $this->e1 = self::REGEX_FILE_EXTENSIONS.self::REGEX_END;
        $this->e2 = self::REGEX_FILE_EXTENSIONS.self::REGEX_SUBJECT_SIZE.self::REGEX_END;

        $defaults = [
            'Settings' => null,
        ];
        $options += $defaults;

        $this->pdo = ($options['Settings'] instanceof DB ? $options['Settings'] : new DB());
        $this->_regexes = new Regexes(['Settings' => $this->pdo, 'Table_Name' => 'collection_regexes']);
    }

    /**
     * Cleans a usenet subject returning a string that can be used to "merge" files together, a pretty subject, a categoryID and the name status.
     *
     * @param string $subject   Subject to parse.
     * @param string $groupName Group to work in.
     *
     * @return array The ID of the Regex Matched and the cleaned collection name
     * @throws \Exception
     */
    public function collectionsCleaner($subject, $groupName): ?array
    {
        $this->subject = $subject;
        $this->groupName = $groupName;

        // Try DB regex first.
        $potentialString = $this->_regexes->tryRegex($subject, $groupName);
        if ($potentialString) {
            return [
                'id'   => $this->_regexes->matchedRegex,
                'name' => $potentialString,
            ];
        }

        switch ($groupName) {
            /*
            case 'alt.binaries.this.is.an.example':
                return $this->_example_method_name();
            */
            case null:
            default:
                return $this->generic();
        }
    }

    /**
     * Cleans usenet subject before inserting, used for collectionhash. If no regexes matched on collectionsCleaner.
     *
     * @return array|null
     */
    protected function generic(): ?array
    {
        // For non music groups.
        if (! preg_match('/\.(flac|lossless|mp3|music|sounds)/', $this->groupName)) {
            // File/part count.
            $cleanSubject = preg_replace('/((( \(\d\d\) -|(\d\d)? - \d\d\.|\d{4} \d\d -) | - \d\d-| \d\d\. [a-z]).+| \d\d of \d\d| \dof\d)\.mp3"?|(\)|\(|\[|\s)\d{1,5}(\/|(\s|_)of(\s|_)|-)\d{1,5}(\)|\]|\s|$|:)|\(\d{1,3}\|\d{1,3}\)|[^\d]{4}-\d{1,3}-\d{1,3}\.|\s\d{1,3}\sof\s\d{1,3}\.|\s\d{1,3}\/\d{1,3}|\d{1,3}of\d{1,3}\.|^\d{1,3}\/\d{1,3}\s|\d{1,3} - of \d{1,3}/i', ' ', $this->subject);
            // File extensions.
            $cleanSubject = preg_replace('/'.$this->e0.'/i', ' ', $cleanSubject);
            // File extensions - If it was not in quotes.
            $cleanSubject = preg_replace('/(-? [a-z0-9]+-?|\(?\d{4}\)?(_|-)[a-z0-9]+)\.jpg"?| [a-z0-9]+\.mu3"?|((\d{1,3})?\.part(\d{1,5})?|\d{1,5} ?|sample|- Partie \d+)?\.(7z|\d{3}(?=(\s|"))|avi|diz|docx?|epub|idx|iso|jpg|m3u|m4a|mds|mkv|mobi|mp4|nfo|nzb|par(\s?2|")|pdf|rar|rev|rtf|r\d\d|sfv|srs|srr|sub|txt|vol.+(par2)|xls|zip|z{2,3})"?|(\s|(\d{2,3})?-)\d{2,3}\.mp3|\d{2,3}\.pdf|\.part\d{1,4}\./i', ' ', $cleanSubject);
            // File Sizes - Non unique ones.
            $cleanSubject = preg_replace('/\d{1,3}(,|\.|\/)\d{1,3}\s(k|m|g)b|(\])?\s\d+KB\s(yENC)?|"?\s\d+\sbytes?|[- ]?\d+(\.|,)?\d+\s(g|k|m)?B\s-?(\s?yenc)?|\s\(d{1,3},\d{1,3}\s{K,M,G}B\)\s|yEnc \d+k$|{\d+ yEnc bytes}|yEnc \d+ |\(\d+ ?(k|m|g)?b(ytes)?\) yEnc$/i', ' ', $cleanSubject);
            // Random stuff.
            $cleanSubject = preg_replace('/AutoRarPar\d{1,5}|\(\d+\)( |  )yEnc|\d+(Amateur|Classic)| \d{4,}[a-z]{4,} |part\d+/i', ' ', $cleanSubject);
            // Multi spaces.
            return [
                'id'   => self::REGEX_GENERIC_MATCH,
                'name' => utf8_encode(trim(preg_replace('/\s\s+/', ' ', $cleanSubject))),
            ];
        } // Music groups.
        else {
            // Try some music group regexes.
            $musicSubject = $this->musicSubject();
            if ($musicSubject !== false) {
                return [
                    'id'   => self::REGEX_MUSIC_MATCH,
                    'name' => $musicSubject,
                ];
            // Parts/files
            } else {
                $cleanSubject = preg_replace('/((( \(\d\d\) -|(\d\d)? - \d\d\.|\d{4} \d\d -) | - \d\d-| \d\d\. [a-z]).+| \d\d of \d\d| \dof\d)\.mp3"?|(\(|\[|\s)\d{1,4}(\/|(\s|_)of(\s|_)|-)\d{1,4}(\)|\]|\s|$|:)|\(\d{1,3}\|\d{1,3}\)|-\d{1,3}-\d{1,3}\.|\s\d{1,3}\sof\s\d{1,3}\.|\s\d{1,3}\/\d{1,3}|\d{1,3}of\d{1,3}\.|^\d{1,3}\/\d{1,3}\s|\d{1,3} - of \d{1,3}/i', ' ', $this->subject);
            }
            // Anything between the quotes. Too much variance within the quotes, so remove it completely.
            $cleanSubject = preg_replace('/".+"/i', ' ', $cleanSubject);
            // File extensions - If it was not in quotes.
            $cleanSubject = preg_replace('/(-? [a-z0-9]+-?|\(?\d{4}\)?(_|-)[a-z0-9]+)\.jpg"?| [a-z0-9]+\.mu3"?|((\d{1,3})?\.part(\d{1,5})?|\d{1,5} ?|sample|- Partie \d+)?\.(7z|\d{3}(?=(\s|"))|avi|diz|docx?|epub|idx|iso|jpg|m3u|m4a|mds|mkv|mobi|mp4|nfo|nzb|par(\s?2|")|pdf|rar|rev|rtf|r\d\d|sfv|srs|srr|sub|txt|vol.+(par2)|xls|zip|z{2,3})"?|(\s|(\d{2,3})?-)\d{2,3}\.mp3|\d{2,3}\.pdf|\.part\d{1,4}\./i', ' ', $cleanSubject);
            // File Sizes - Non unique ones.
            $cleanSubject = preg_replace('/\d{1,3}(,|\.|\/)\d{1,3}\s(k|m|g)b|(\])?\s\d+KB\s(yENC)?|"?\s\d+\sbytes?|[- ]?\d+[.,]?\d+\s(g|k|m)?B\s-?(\s?yenc)?|\s\(d{1,3},\d{1,3}\s{K,M,G}B\)\s|yEnc \d+k$|{\d+ yEnc bytes}|yEnc \d+ |\(\d+ ?(k|m|g)?b(ytes)?\) yEnc$/i', ' ', $cleanSubject);
            // Random stuff.
            $cleanSubject = preg_replace('/AutoRarPar\d{1,5}|\(\d+\)( |  )yEnc|\d+(Amateur|Classic)| \d{4,}[a-z]{4,} |part\d+/i', ' ', $cleanSubject);
            // Multi spaces.
            $cleanSubject = utf8_encode(trim(preg_replace('/\s\s+/i', ' ', $cleanSubject)));
            // If the subject is too similar to another because it is so short, try to extract info from the subject.
            if (strlen($cleanSubject) <= 10 || preg_match('/^[-a-z0-9$ ]{1,7}yEnc$/i', $cleanSubject)) {
                $x = '';
                if (preg_match('/.*("[A-Z0-9]+).*?"/i', $this->subject, $match)) {
                    $x = $match[1];
                }
                if (preg_match_all('/[^A-Z0-9]/i', $this->subject, $match1)) {
                    $start = 0;
                    foreach ($match1[0] as $add) {
                        if ($start > 2) {
                            break;
                        }
                        $x .= $add;
                        $start++;
                    }
                }
                $newName = preg_replace('/".+?"/', '', $this->subject);
                $newName = preg_replace('/[a-z0-9]|'.$this->e0.'/i', '', $newName);

                return [
                    'id'   => self::REGEX_MUSIC_MATCH,
                    'name' => $cleanSubject.$newName.$x,
                ];
            } else {
                return [
                    'id'   => self::REGEX_MUSIC_MATCH,
                    'name' => $cleanSubject,
                ];
            }
        }
    }

    /**
     * Generic regexes for music groups.
     *
     * @return bool
     */
    protected function musicSubject()
    {
        //Broderick_Smith-Unknown_Country-2009-404 "00-broderick_smith-unknown_country-2009.sfv" yEnc
        if (preg_match('/^(\w{10,}-[a-zA-Z0-9]+ ")\d\d-.+?" yEnc$/', $this->subject, $match)) {
            return $match[1];
        }

        return false;
    }
}