<?php
namespace app\common\logic;

final class ModelNaming
{
    /** 生成稳定的 model_code（只用 *_code 与关键数字） */
    public static function buildModelCode(array $s): string
    {
        $brand  = self::tok($s['brand_code']  ?? '');
        $series = self::tok($s['series_code'] ?? '');
        $fuel   = self::tok($s['fuel_type_code'] ?? 'UNK');

        $parts = [$brand, $series];
        $key   = [];

        switch ($fuel) {
            case 'EV':
                $key[] = 'EV';
                if (!empty($s['range_km'])) {
                    $key[] = (string) (round((int)$s['range_km'] / 10) * 10); // 到十位
                } elseif (!empty($s['battery_kwh'])) {
                    $key[] = self::numToken($s['battery_kwh']) . 'KWH';
                }
                break;

            case 'GAS':
                if (!empty($s['engine_disp_l'])) $key[] = self::dispToken($s['engine_disp_l']); // 1.5L -> 15L
                if (!empty($s['engine_turbo']) && (int)$s['engine_turbo'] === 1) $key[] = 'T';
                if (!empty($s['transmission_code'])) $key[] = self::tok($s['transmission_code']);
                break;

            case 'HEV':
            case 'PHEV':
            case 'EREV':
                $key[] = $fuel;
                if (!empty($s['engine_disp_l']))   $key[] = self::dispToken($s['engine_disp_l']);
                if (!empty($s['motor_layout_code'])) $key[] = self::tok($s['motor_layout_code']); // 如 DM-I/DM-P/AWD
                break;

            default:
                $key[] = $fuel;
        }

        if (!empty($s['drive_type_code'])) $key[] = self::tok($s['drive_type_code']);

        $parts[] = implode('_', array_filter($key));
        return strtoupper(implode('_', array_filter($parts)));
    }

    /** 生成中文可读的 model_name（走快照中文，不依赖 i18n） */
    public static function buildModelName(array $s): string
    {
        $seriesName = trim((string)($s['series_name'] ?? $s['series_code'] ?? ''));
        $yearPart   = !empty($s['model_year']) ? ($s['model_year'] . '款 ') : '';

        $fuel = strtoupper($s['fuel_type_code'] ?? '');
        $tail = '';

        if ($fuel === 'EV') {
            $range = !empty($s['range_km']) ? (int)$s['range_km'] . 'KM ' : '';
            $drive = trim((string)($s['drive_type'] ?? $s['drive_type_code'] ?? ''));
            $tail  = "EV {$range}{$drive}";
        } elseif ($fuel === 'GAS') {
            $disp = (!empty($s['engine_disp_l']))
                ? rtrim(rtrim(number_format((float)$s['engine_disp_l'], 1, '.', ''), '0'), '.') . 'L '
                : '';
            $trans = trim((string)($s['transmission'] ?? $s['transmission_code'] ?? ''));
            $tail  = "{$disp}{$trans}";
        } else {
            $tail = trim((string)($s['fuel_type'] ?? $fuel));
        }

        $extras = [];
        foreach (['trim','trim_level','edition_name'] as $k) {
            if (!empty($s[$k])) $extras[] = trim((string)$s[$k]);
        }
        $extraStr = $extras ? ' ' . implode(' ', $extras) : '';

        return trim($seriesName . ' ' . $yearPart . $tail . $extraStr);
    }

    /* ===== Helpers ===== */

    private static function tok($v): string
    {
        $v = strtoupper((string)$v);
        return preg_replace('/[^A-Z0-9_]/', '', $v ?? '');
    }

    private static function numToken($v): string
    {
        return preg_replace('/[^0-9]/', '', (string)$v);
    }

    /** 1.5L -> 15L；2.0L -> 20L（便于 code 稳定检索） */
    private static function dispToken($l): string
    {
        $x = (float)$l;
        return (string)round($x * 10) . 'L';
    }
}