<?php

namespace Modules\EcommerceFinance\Services;

use Carbon\CarbonImmutable;
use Illuminate\Support\Facades\Cache;
use Modules\EcommerceFinance\Repositories\BusinessInformationMirrorRepository;
use Modules\EcommerceFinance\Repositories\StoreReportRepository;
use Throwable;

/**
 * 内部流转预计销量取自主体维度经营报表的上月业绩。
 */
class InternalFlowProjection
{
    public const BUYER_INVOICE_RATE = 0.20;

    public const INTERNAL_INVOICE_RATE = 0.25;

    public const INPUT_COST_RATE = 0.80;

    public function __construct(
        private readonly BusinessInformationMirrorRepository $businessInformation,
        private readonly StoreReportRepository $storeReports,
    ) {}

    /**
     * @return array{
     *     forecast_month:string,
     *     forecast_month_label:string,
     *     source_month:string,
     *     source_month_label:string,
     *     sales_by_company:array<string,float|null>
     * }
     */
    public function forMonth(?CarbonImmutable $asOf = null): array
    {
        $forecastMonth = ($asOf ?? CarbonImmutable::now())->startOfMonth();
        $sourceMonth = $forecastMonth->subMonthNoOverflow();
        $cacheKey = 'internal-flow-projection:v1:' . $sourceMonth->format('Y-m');
        $resolve = fn (): array => $this->build($forecastMonth, $sourceMonth);

        try {
            return Cache::remember($cacheKey, now()->addMinutes(10), $resolve);
        } catch (Throwable $exception) {
            report($exception);

            return $resolve();
        }
    }

    /**
     * @return array{
     *     forecast_month:string,
     *     forecast_month_label:string,
     *     source_month:string,
     *     source_month_label:string,
     *     sales_by_company:array<string,float|null>
     * }
     */
    private function build(CarbonImmutable $forecastMonth, CarbonImmutable $sourceMonth): array
    {
        $stores = $this->businessInformation->receivingAccountStores();
        foreach ($stores as &$store) {
            // 标记系统主体已知，避免 StoreReportPeriodBuilder 再次按店铺批量查询主体。
            $store['system_company_name'] = $store['company_name'] ?? null;
        }
        unset($store);
        $rows = $this->storeReports->rows($stores, $sourceMonth->year, []);
        $incomeKey = sprintf('income_%02d', $sourceMonth->month);
        $totals = [];

        foreach ($rows as $row) {
            $entity = trim((string) ($row['entity'] ?? ''));
            if ($entity === '') {
                continue;
            }

            $totals[$entity] ??= ['has_value' => false, 'amount' => 0.0];
            $value = $row[$incomeKey] ?? null;
            if ($value === null || $value === '') {
                continue;
            }

            $totals[$entity]['has_value'] = true;
            $totals[$entity]['amount'] += (float) $value;
        }

        return [
            'forecast_month' => $forecastMonth->format('Y-m'),
            'forecast_month_label' => $forecastMonth->format('n') . '月',
            'source_month' => $sourceMonth->format('Y-m'),
            'source_month_label' => $sourceMonth->format('n') . '月',
            'sales_by_company' => array_map(
                static fn (array $total): ?float => $total['has_value']
                    ? round((float) $total['amount'], 6)
                    : null,
                $totals,
            ),
        ];
    }
}