<?php

namespace App\Actions\Dealer;

use App\Models\Dealer;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\Cache;

class CalculatePurchaseAmountOfCurrentPeriod
{
    public function __construct(
        protected CalculatePurchaseAmount $calculatePurchaseAmount,
    ) {
    }

    /**
     * 计算当期的进货业绩
     *
     * @param \App\Models\Dealer $dealer
     * @return string
     */
    public function handle(Dealer $dealer): string
    {
        $tz = now();

        if ($tz->day >= 20) {
            $startAt = $tz->copy()->setDay(20)->startOfDay();
        } elseif ($tz->day >= 5) {
            $startAt = $tz->copy()->setDay(5)->startOfDay();
        } else {
            $startAt = $tz->copy()->subMonthNoOverflow()->setDay(20)->startOfDay();
        }

        return Cache::remember($this->prefix($startAt).':'.$dealer->user_id, 600, function () use ($dealer, $startAt) {
            return bcdiv($this->calculatePurchaseAmount->handle($dealer, $startAt), '1', 2);
        });
    }

    /**
     * @param \Illuminate\Support\Carbon $tz
     * @return string
     */
    protected function prefix(Carbon $tz): string
    {
        return $tz->rawFormat('ymd').'_dealer_purchase_amount';
    }
}