<?php

declare(strict_types=1);

namespace App\Services;

use App\Repositories\PromocodeRepository;

final class PriceTierService
{
    public function __construct(
        private readonly ?PromocodeRepository $promocodes = null
    ) {
    }

    /**
     * @return array<int, array<string, mixed>>
     */
    public function forAmount(float $basePrice): array
    {
        $tiers = [[
            'label' => 'Базовая цена',
            'min_order_amount' => 0.0,
            'discount_percent' => 0.0,
            'price' => $this->customerFriendlyPrice($basePrice),
            'note' => 'Без промокода',
        ]];

        foreach ($this->repository()->priceTiers() as $promocode) {
            $discount = (float) $promocode['discount_value'];
            $minOrderAmount = (float) $promocode['min_order_amount'];
            $tiers[] = [
                'label' => $this->priceTierLabel($minOrderAmount, (string) ($promocode['price_tier_label'] ?: $promocode['title'])),
                'code' => $promocode['code'],
                'min_order_amount' => $minOrderAmount,
                'discount_percent' => $discount,
                'price' => $this->customerFriendlyPrice($basePrice * (100 - $discount) / 100),
                'note' => $promocode['payment_note'],
            ];
        }

        $tiers[] = [
            'label' => 'Оплата по расчетному счету',
            'code' => null,
            'min_order_amount' => 0.0,
            'discount_percent' => -8.0,
            'price' => $this->customerFriendlyPrice($basePrice * 1.08),
            'note' => '+8% к базовой цене при безналичном расчете',
        ];

        return $tiers;
    }

    private function customerFriendlyPrice(float $price): int
    {
        return (int) floor($price);
    }

    private function priceTierLabel(float $minOrderAmount, string $fallback): string
    {
        if ((int) $minOrderAmount === 20000) {
            return 'Цена при сумме заказа от 20 000р. наличными';
        }

        if ((int) $minOrderAmount === 50000) {
            return 'Цена при сумме заказа от 50 000р. наличными';
        }

        return $fallback;
    }

    private function repository(): PromocodeRepository
    {
        return $this->promocodes ?? new PromocodeRepository();
    }
}