<?php

namespace Modules\EcommerceFinance\Services;

use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Schema;
use Throwable;

/**
 * 「总账备注」取值：按（平台 + 账单项目）匹配 ec_account_ledger_remarks。
 *
 * 店铺收款账户账单各页签的账单项目名称不一致，平台口径以店铺名前缀为准
 * （如「抖音-xxx」「天猫-xxx」），页签默认平台只作为兜底，避免淘系页签里
 * 天猫/淘宝/阿里巴巴三类项目混用同一份映射。
 */
class AccountLedgerRemarkMap
{
    public const CACHE_KEY = 'ec_account_ledger_remarks_map_v1';

    /** 页签默认平台（店铺名没有平台前缀时使用）。 */
    private const TAB_PLATFORM = [
        'taobao-alipay' => '淘宝',
        'taobao-wechat' => '淘宝',
        'pinduoduo' => '拼多多',
        'jd-transactions' => '京东',
        'jingxi' => '京喜',
        'jd-wallet' => '京东',
        'douyin' => '抖音',
        'dewu' => '得物',
        'vipshop' => '唯品会MP',
        'vipshop-jx' => '唯品会jx',
    ];

    /** 店铺名前缀可识别的平台（顺序敏感：先长后短）。 */
    private const STORE_PREFIX_PLATFORMS = [
        '唯品会JX' => '唯品会jx',
        '唯品会MP' => '唯品会MP',
        '阿里巴巴' => '阿里巴巴',
        '拼多多' => '拼多多',
        '天猫' => '天猫',
        '淘宝' => '淘宝',
        '抖音' => '抖音',
        '得物' => '得物',
        '京喜' => '京喜',
        '京东' => '京东',
    ];

    /**
     * @return array<string,array<string,string>> [platform => [bill_item => ledger_remark]]
     */
    public function map(): array
    {
        return Cache::rememberForever(self::CACHE_KEY, function (): array {
            try {
                if (! Schema::hasTable('ec_account_ledger_remarks')) {
                    return [];
                }

                $map = [];
                foreach (\Illuminate\Support\Facades\DB::table('ec_account_ledger_remarks')
                    ->select(['platform', 'bill_item', 'ledger_remark'])
                    ->get() as $row) {
                    $platform = trim((string) $row->platform);
                    $item = trim((string) $row->bill_item);
                    if ($platform === '' || $item === '') {
                        continue;
                    }
                    $map[$platform][$item] = (string) $row->ledger_remark;
                }

                return $map;
            } catch (Throwable) {
                return [];
            }
        });
    }

    public function forget(): void
    {
        Cache::forget(self::CACHE_KEY);
    }

    /** 页签默认平台。 */
    public function defaultPlatform(string $tab): ?string
    {
        return self::TAB_PLATFORM[$tab] ?? null;
    }

    /** 解析某一行账单所属平台：优先店铺名前缀，其次页签默认。 */
    public function platform(?string $storeName, ?string $tabPlatform): ?string
    {
        $name = trim((string) $storeName);
        if ($name !== '') {
            foreach (self::STORE_PREFIX_PLATFORMS as $prefix => $platform) {
                if (str_starts_with($name, $prefix)) {
                    return $platform;
                }
            }
        }

        return $tabPlatform;
    }

    /** 查总账备注；没有匹配返回 null。 */
    public function remark(?string $storeName, ?string $tabPlatform, ?string $billItem): ?string
    {
        $item = trim((string) $billItem);
        if ($item === '') {
            return null;
        }

        $map = $this->map();
        if ($map === []) {
            return null;
        }

        foreach ([$this->platform($storeName, $tabPlatform), $tabPlatform] as $platform) {
            if ($platform === null || $platform === '') {
                continue;
            }
            if (isset($map[$platform][$item])) {
                return $map[$platform][$item];
            }
        }

        return null;
    }

    /**
     * 给一行账单补上 payload.ledger_remark（内部字段名 ledger_remark）。
     *
     * @param  array<string,mixed>  $row
     * @return array<string,mixed>
     */
    public function decorate(array $row, string $tab): array
    {
        $tabPlatform = $this->defaultPlatform($tab);
        $remark = $this->remark(
            $row['store_name'] ?? null,
            $tabPlatform,
            $row['bill_item'] ?? null,
        );
        if ($remark === null) {
            return $row;
        }

        $payload = is_array($row['payload'] ?? null) ? $row['payload'] : [];
        $payload['ledger_remark'] = $remark;
        $row['payload'] = $payload;
        // 淘系支付宝页签按顶层字段取值，这里同时补一份，页面与导出共用。
        $row['ledger_remark'] = $remark;

        return $row;
    }

    /**
     * @param  iterable<int,array<string,mixed>>  $rows
     * @return \Generator<int,array<string,mixed>>
     */
    public function decorateAll(iterable $rows, string $tab): \Generator
    {
        foreach ($rows as $row) {
            yield is_array($row) ? $this->decorate($row, $tab) : $row;
        }
    }
}