<?php

declare(strict_types=1);

namespace TFGraphics\SmartImport\Capability;

final class IdentifierAnalyzer
{
    public const ISBN = 'ISBN';
    public const EAN = 'EAN';
    public const UPC = 'UPC';
    public const ASIN = 'ASIN';
    public const MPN = 'MPN';
    public const TITLE = 'TITLE';
    public const BARCODE = 'BARCODE';
    public const UNKNOWN = 'UNKNOWN';

    public function classify(string $value): string
    {
        $input = trim($value);
        if ($input === '') {
            return self::UNKNOWN;
        }

        $compact = strtoupper(str_replace([' ', '-'], '', $input));

        if ($this->isIsbn($compact)) {
            return self::ISBN;
        }

        if (preg_match('/^[0-9]{13}$/', $compact) === 1) {
            return self::EAN;
        }

        if (preg_match('/^[0-9]{12}$/', $compact) === 1) {
            return self::UPC;
        }

        if (preg_match('/^[A-Z0-9]{10}$/', $compact) === 1 && preg_match('/[A-Z]/', $compact) === 1) {
            return self::ASIN;
        }

        if ($this->looksLikeBarcode($compact)) {
            return self::BARCODE;
        }

        if ($this->isMpn($compact)) {
            return self::MPN;
        }

        if ($this->looksLikeTitle($input)) {
            return self::TITLE;
        }

        return self::UNKNOWN;
    }

    private function isIsbn(string $compact): bool
    {
        if (preg_match('/^[0-9]{9}[0-9X]$/', $compact) === 1) {
            return true;
        }

        return preg_match('/^97[89][0-9]{10}$/', $compact) === 1;
    }

    private function looksLikeBarcode(string $compact): bool
    {
        return preg_match('/^[0-9]{8,14}$/', $compact) === 1;
    }

    private function isMpn(string $compact): bool
    {
        if (preg_match('/^[A-Z0-9][A-Z0-9\-\.]{4,39}$/', $compact) !== 1) {
            return false;
        }

        return preg_match('/[A-Z]/', $compact) === 1 && preg_match('/[0-9]/', $compact) === 1;
    }

    private function looksLikeTitle(string $input): bool
    {
        if (strlen($input) < 3) {
            return false;
        }

        return preg_match('/[A-Za-z]/', $input) === 1;
    }
}