<?php

declare(strict_types=1);

namespace Agent001\Api\Order;

\defined( 'ABSPATH' ) || exit;

use WC_Order;

final class TrackingResolver
{
    private const META_KEYS = [
        '_tracking_number',
        '_wc_shipment_tracking_items',
        '_aftership_tracking_number',
    ];

    private const URL_TEMPLATES = [
        'inpost'       => 'https://inpost.pl/pl/pomoc/znajdz-przesylke?parcel=%s',
        'dpd'          => 'https://tracktrace.dpd.com.pl/parcelDetails?p1=%s',
        'dhl'          => 'https://www.dhl.com/pl-pl/home/sledzenie-przesylek.html?tracking-id=%s',
        'pocztapolska' => 'https://emonitoring.poczta-polska.pl/?numer=%s',
        'gls'          => 'https://gls-group.com/PL/pl/sledzenie-paczek?match=%s',
        'ups'          => 'https://www.ups.com/track?loc=pl_PL&tracknum=%s',
        'fedex'        => 'https://www.fedex.com/fedextrack/?trknbr=%s',
    ];

    private const CARRIER_HOSTS = [
        'inpost.pl'         => 'inpost',
        'dpd.com.pl'        => 'dpd',
        'dpd.pl'            => 'dpd',
        'dhl.com'           => 'dhl',
        'dhl.pl'            => 'dhl',
        'dhlparcel.pl'      => 'dhl',
        'poczta-polska.pl'  => 'pocztapolska',
        'gls-group.com'     => 'gls',
        'gls-group.eu'      => 'gls',
        'gls-pl.com'        => 'gls',
        'ups.com'           => 'ups',
        'fedex.com'         => 'fedex',
        'orlenpaczka.pl'    => 'orlen',
    ];

    private const CARRIER_KEYWORDS = [
        'inpost'       => '/inpost|paczkomat/i',
        'dpd'          => '/\bdpd\b/i',
        'dhl'          => '/\bdhl\b/i',
        'pocztapolska' => '/poczta\s+polska|pocztex|envelo/i',
        'gls'          => '/\bgls\b/i',
        'ups'          => '/\bups\b/i',
        'fedex'        => '/fedex/i',
        'orlen'        => '/orlen/i',
    ];

    private const NUMBER_PARAMS = [ 'parcel', 'number', 'numer', 'p1', 'tracking-id', 'tracknum', 'match', 'trknbr', 'tracking_number' ];

    /**
     * @return list<array{number: string, carrier: string, url: string}>
     */
    public function resolve( WC_Order $order ): array
    {
        $fallbackCarrier = $this->carrierFromText( (string) $order->get_shipping_method() );
        $tracking        = $this->fromMeta( $order, $fallbackCarrier );

        if ( \function_exists( 'wc_get_order_notes' ) ) {
            foreach ( (array) \wc_get_order_notes( [ 'order_id' => $order->get_id() ] ) as $note ) {
                if ( is_object( $note ) && isset( $note->content ) && is_string( $note->content ) ) {
                    $tracking = array_merge( $tracking, $this->fromText( $note->content, $fallbackCarrier ) );
                }
            }
        }

        $filtered = \apply_filters( 'agent001_order_tracking', $this->unique( $tracking ), $order );

        return is_array( $filtered ) ? $this->unique( $filtered ) : [];
    }

    /**
     * @return list<array{number: string, carrier: string, url: string}>
     */
    public function fromText( string $text, string $fallbackCarrier = '' ): array
    {
        $tracking = [];
        $text     = html_entity_decode( $text, ENT_QUOTES | ENT_HTML5, 'UTF-8' );

        if ( preg_match_all( '~https://[^\s"\'<>]+~i', $text, $urls ) ) {
            foreach ( $urls[0] as $url ) {
                $entry = $this->fromUrl( rtrim( $url, '.,;)' ) );
                if ( $entry !== null ) {
                    $tracking[] = $entry;
                }
            }
        }

        $plain = \wp_strip_all_tags( $text );
        if ( preg_match_all( '/przesy[łl]k\w*\D{0,40}?\b([A-Z0-9]{10,34})\b/iu', $plain, $numbers ) ) {
            $carrier = $this->carrierFromText( $plain );
            $carrier = $carrier !== '' ? $carrier : $fallbackCarrier;
            foreach ( $numbers[1] as $number ) {
                if ( preg_match( '/\d/', $number ) ) {
                    $tracking[] = $this->entry( $number, $carrier, '' );
                }
            }
        }

        return $this->unique( $tracking );
    }

    /**
     * @return list<array{number: string, carrier: string, url: string}>
     */
    private function fromMeta( WC_Order $order, string $fallbackCarrier ): array
    {
        $tracking = [];

        foreach ( self::META_KEYS as $key ) {
            $value = $order->get_meta( $key, true );
            if ( is_string( $value ) && $value !== '' ) {
                $tracking[] = $this->entry( $value, $fallbackCarrier, '' );
                continue;
            }
            if ( ! is_array( $value ) ) {
                continue;
            }
            foreach ( $value as $item ) {
                if ( ! is_array( $item ) || empty( $item['tracking_number'] ) ) {
                    continue;
                }
                $provider = (string) ( $item['tracking_provider'] ?? $item['custom_tracking_provider'] ?? '' );
                $carrier  = $this->carrierFromText( $provider );
                $tracking[] = $this->entry(
                    (string) $item['tracking_number'],
                    $carrier !== '' ? $carrier : $fallbackCarrier,
                    (string) ( $item['custom_tracking_link'] ?? '' )
                );
            }
        }

        return $tracking;
    }

    /**
     * @return array{number: string, carrier: string, url: string}|null
     */
    private function fromUrl( string $url ): ?array
    {
        $host = strtolower( (string) \wp_parse_url( $url, PHP_URL_HOST ) );
        $carrier = '';
        foreach ( self::CARRIER_HOSTS as $domain => $slug ) {
            if ( $host === $domain || substr( $host, -strlen( '.' . $domain ) ) === '.' . $domain ) {
                $carrier = $slug;
                break;
            }
        }
        if ( $carrier === '' ) {
            return null;
        }

        parse_str( (string) \wp_parse_url( $url, PHP_URL_QUERY ), $query );
        foreach ( self::NUMBER_PARAMS as $param ) {
            if ( isset( $query[ $param ] ) && is_string( $query[ $param ] ) && preg_match( '/\A[A-Za-z0-9]{6,40}\z/', $query[ $param ] ) ) {
                return $this->entry( $query[ $param ], $carrier, $url );
            }
        }

        $segment = basename( (string) \wp_parse_url( $url, PHP_URL_PATH ) );
        if ( preg_match( '/\A(?=.*\d)[A-Za-z0-9]{8,40}\z/', $segment ) ) {
            return $this->entry( $segment, $carrier, $url );
        }

        return null;
    }

    /**
     * @return array{number: string, carrier: string, url: string}
     */
    private function entry( string $number, string $carrier, string $url ): array
    {
        $number = trim( $number );
        if ( $url === '' && isset( self::URL_TEMPLATES[ $carrier ] ) ) {
            $url = sprintf( self::URL_TEMPLATES[ $carrier ], rawurlencode( $number ) );
        }

        return [
            'number'  => $number,
            'carrier' => $carrier,
            'url'     => strpos( $url, 'https://' ) === 0 ? \esc_url_raw( $url ) : '',
        ];
    }

    private function carrierFromText( string $text ): string
    {
        foreach ( self::CARRIER_KEYWORDS as $carrier => $pattern ) {
            if ( preg_match( $pattern, $text ) ) {
                return $carrier;
            }
        }

        return '';
    }

    /**
     * @param array<mixed> $tracking
     * @return list<array{number: string, carrier: string, url: string}>
     */
    private function unique( array $tracking ): array
    {
        $byNumber = [];
        foreach ( $tracking as $entry ) {
            if ( ! is_array( $entry ) || ! isset( $entry['number'] ) || ! is_string( $entry['number'] ) || trim( $entry['number'] ) === '' ) {
                continue;
            }
            $number  = trim( $entry['number'] );
            $current = $byNumber[ $number ] ?? null;
            $candidate = [
                'number'  => $number,
                'carrier' => is_string( $entry['carrier'] ?? null ) ? $entry['carrier'] : '',
                'url'     => is_string( $entry['url'] ?? null ) ? $entry['url'] : '',
            ];
            if ( $current === null ) {
                $byNumber[ $number ] = $candidate;
                continue;
            }
            if ( $current['carrier'] === '' ) {
                $byNumber[ $number ]['carrier'] = $candidate['carrier'];
            }
            if ( $current['url'] === '' ) {
                $byNumber[ $number ]['url'] = $candidate['url'];
            }
        }

        return array_slice( array_values( $byNumber ), 0, 5 );
    }
}