<?php

namespace App\Services;

class VinDecoder
{
    /** WMI (first 3 chars of VIN) → manufacturer/country (subset relevant for European cars). */
    public const WMI = [
        'WBA' => ['BMW', 'Germany'], 'WBS' => ['BMW M', 'Germany'],
        'WAU' => ['Audi', 'Germany'], 'WA1' => ['Audi SUV', 'Germany'],
        'WVW' => ['Volkswagen', 'Germany'], 'WV1' => ['VW Comm', 'Germany'], 'WV2' => ['VW Bus', 'Germany'],
        'WP0' => ['Porsche', 'Germany'], 'WP1' => ['Porsche SUV', 'Germany'],
        'WDB' => ['Mercedes-Benz', 'Germany'], 'WDC' => ['Mercedes SUV', 'Germany'], 'WDD' => ['Mercedes AMG', 'Germany'],
        'TMB' => ['Skoda', 'Czechia'],
        'JF1' => ['Subaru', 'Japan'], 'JS3' => ['Suzuki', 'Japan'],
        'JT1' => ['Toyota', 'Japan'], 'JTD' => ['Toyota Hybrid', 'Japan'],
        'JHM' => ['Honda', 'Japan'], '1HG' => ['Honda US', 'USA'],
        'KMH' => ['Hyundai', 'Korea'], 'KNA' => ['Kia', 'Korea'],
        'VF1' => ['Renault', 'France'], 'VF3' => ['Peugeot', 'France'], 'VF7' => ['Citroen', 'France'],
        'ZFA' => ['Fiat', 'Italy'], 'ZAR' => ['Alfa Romeo', 'Italy'],
        'WF0' => ['Ford EU', 'Germany'], '1FA' => ['Ford US', 'USA'],
        'YV1' => ['Volvo', 'Sweden'],
        'W0L' => ['Opel', 'Germany'],
    ];

    /** 10th VIN char (model year). */
    public const YEAR_CODES = [
        'A' => 2010, 'B' => 2011, 'C' => 2012, 'D' => 2013, 'E' => 2014, 'F' => 2015,
        'G' => 2016, 'H' => 2017, 'J' => 2018, 'K' => 2019, 'L' => 2020, 'M' => 2021,
        'N' => 2022, 'P' => 2023, 'R' => 2024, 'S' => 2025, 'T' => 2026,
        '1' => 2001, '2' => 2002, '3' => 2003, '4' => 2004, '5' => 2005,
        '6' => 2006, '7' => 2007, '8' => 2008, '9' => 2009,
    ];

    public function decode(string $vin): array
    {
        $vin = strtoupper(trim($vin));
        if (strlen($vin) < 11) {
            return ['valid' => false, 'error' => 'VIN trebuie să aibă cel puțin 11 caractere.'];
        }

        $wmi = substr($vin, 0, 3);
        $manufacturer = self::WMI[$wmi] ?? null;
        $yearChar = $vin[9] ?? null;
        $year = self::YEAR_CODES[$yearChar] ?? null;

        // Heuristic: 70s/80s/90s vs 2000s+ — model year alone is ambiguous,
        // we just return what we can.
        return [
            'valid' => $manufacturer !== null,
            'vin' => $vin,
            'wmi' => $wmi,
            'manufacturer' => $manufacturer[0] ?? '?',
            'country' => $manufacturer[1] ?? '?',
            'serial' => substr($vin, 11),
            'year' => $year,
        ];
    }
}