<?php

namespace App\Support;

use App\Models\Bank;
use App\Models\Customer;
use App\Models\MailCampaign;
use App\Models\Service;

class RenewalCampaign
{
    private const SERVICE_KEYS = ['service_name', 'billing_cycle', 'period_start', 'period_end', 'expires_date', 'total_amount', 'vat_rate', 'vat_amount', 'payment_content', 'bank_qr_url'];

    public static function withoutServiceValues(?array $variables): ?array
    {
        $kept = array_diff_key($variables ?? [], array_flip(self::SERVICE_KEYS));

        return $kept ?: null;
    }

    /**
     * @return array<string, string>
     */
    public static function sampleValues(MailCampaign $campaign): array
    {
        $first = $campaign->renewal_services[0]['service_id'] ?? null;
        $service = $first ? Service::with('customer')->find($first) : null;

        return $service?->customer ? (self::valuesFor($campaign, $service->customer, $service->id) ?? []) : [];
    }

    public static function isRenewalTemplate(MailCampaign $campaign): bool
    {
        $keys = MailPlaceholders::extract($campaign->subject, $campaign->message);

        return in_array('period_end', $keys, true) && in_array('bank_qr_url', $keys, true);
    }

    /**
     * @return array<string, string>|null null khi dịch vụ không còn thuộc khách hoặc không thể gia hạn
     */
    public static function valuesFor(MailCampaign $campaign, Customer $customer, int $serviceId): ?array
    {
        $months = collect($campaign->renewal_services)->firstWhere('service_id', $serviceId)['months'] ?? null;
        $service = Service::with(['orderItem', 'product', 'customProduct'])
            ->whereKey($serviceId)
            ->where('customer_id', $customer->id)
            ->first();
        $quote = $service ? RenewalQuote::forService($service, $months) : null;
        if (! $quote) {
            return null;
        }

        unset($quote['service_id'], $quote['cycles'], $quote['months']);

        $bank = Bank::where('account_no', $campaign->variables['bank_account_no'] ?? '')->first();

        return $bank
            ? [...$quote, 'bank_qr_url' => VietQr::url($bank, $quote['total_amount'], $quote['payment_content'])]
            : $quote;
    }
}