<?php

namespace App\Support;

use App\Helpers\OrderHelper;
use App\Models\Service;
use Illuminate\Support\Carbon;
use Illuminate\Support\Collection;
use Illuminate\Support\Str;

class RenewalQuote
{
    private const TYPE_LABELS = [
        'domain' => 'tên miền',
        'hosting' => 'hosting',
        'vps' => 'Cloud VPS',
        'ssl' => 'SSL',
    ];

    /**
     * @param array<int, int> $customerIds
     * @return Collection<int, Service>
     */
    public static function dueServices(array $customerIds, int $days): Collection
    {
        return Service::query()
            ->with(['customer:id,uuid,fullname,email', 'orderItem', 'product', 'customProduct'])
            ->whereIn('customer_id', $customerIds)
            ->whereNotIn('status', ['terminated', 'cancelled'])
            ->whereNotNull('expires_at')
            ->where('expires_at', '<=', now()->addDays($days)->endOfDay())
            ->orderBy('expires_at')
            ->get();
    }

    public static function forService(Service $service, ?int $months = null): ?array
    {
        $orderItem = $service->orderItem;
        $product = $service->customProduct ?? $service->product;
        if (! $orderItem || ! $product) {
            return null;
        }

        $baseMonths = OrderHelper::cycleToMonths($orderItem->billing_cycle);
        $options = RenewalPricing::options($product);
        $base = RenewalPricing::option($product, $baseMonths);
        if (! $base) {
            return null;
        }

        $rate = VatSettings::rateFor($service->product?->product_type);
        $start = ($service->expires_at ?? now())->copy();
        $target = $service->server_name ?: $product->name;
        $label = self::TYPE_LABELS[$service->type] ?? null;
        $terms = fn (array $option) => self::terms($service, $option, $baseMonths, $start, $rate);

        return [
            'service_id' => $service->id,
            'service_name' => 'Gia hạn ' . ($label ? $label . ' - ' : '') . $target,
            'period_start' => $start->format('d/m/Y'),
            'expires_date' => $start->format('d/m/Y'),
            'vat_rate' => rtrim(rtrim(number_format($rate, 2, '.', ''), '0'), '.'),
            'payment_content' => Str::limit('GIA HAN ' . Str::upper(Str::ascii($target)), 50, ''),
            ...$terms(RenewalPricing::option($product, (int) $months) ?? $base),
            'cycles' => array_map($terms, $options),
        ];
    }

    /**
     * @param array{months: int, price: int} $option
     * @return array{months: int, billing_cycle: string, period_end: string, total_amount: string, vat_amount: string}
     */
    private static function terms(Service $service, array $option, int $baseMonths, Carbon $start, float $rate): array
    {
        $months = $option['months'];
        $amount = $option['price'] + RenewalPricing::addonTotal($service, $months / $baseMonths);

        return [
            'months' => $months,
            'billing_cycle' => sprintf('%02d %s', $months % 12 === 0 ? $months / 12 : $months, $months % 12 === 0 ? 'năm' : 'tháng'),
            'period_end' => $start->copy()->addMonthsNoOverflow($months)->subDay()->format('d/m/Y'),
            'total_amount' => number_format($amount, 0, ',', '.'),
            'vat_amount' => number_format((int) round($amount * $rate / (100 + $rate)), 0, ',', '.'),
        ];
    }
}