<?php

namespace App\Services\Qr;

use App\Models\QrCode;
use App\Models\QrTransaction;
use App\Models\QrWallet;
use App\Models\User;
use App\Services\Billing\BillingClient;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use RuntimeException;

/**
 * QR Plus billing — consumes the platform UserWallet via the Billing API.
 */
class QrWalletBillingService
{
    public function __construct(
        private BillingClient $billing,
    ) {}

    public function balanceCedis(User $user): float
    {
        return $this->billing->balanceMinor($user->public_id) / 100;
    }

    public function canCreate(User $user): bool
    {
        $priceMinor = (int) round(QrWallet::pricePerQr() * 100);

        return $this->billing->canAfford($user->public_id, $priceMinor);
    }

    public function debitForQrCreation(QrWallet $wallet, QrCode $qrCode): QrTransaction
    {
        $price = QrWallet::pricePerQr();
        $priceMinor = (int) round($price * 100);
        $user = $wallet->user;
        $reference = 'QR-DEBIT-'.strtoupper(Str::random(12));

        return DB::transaction(function () use ($wallet, $user, $qrCode, $price, $priceMinor, $reference) {
            $ok = $this->billing->debit(
                $user->public_id,
                $priceMinor,
                'qr',
                'qr_create',
                $reference,
                $qrCode->id,
                sprintf('Created QR code: %s', $qrCode->label),
            );

            if (! $ok) {
                throw new RuntimeException('Insufficient wallet balance.');
            }

            $wallet->increment('qr_codes_total');
            $balanceAfter = $this->billing->balanceMinor($user->public_id) / 100;

            return QrTransaction::create([
                'user_id' => $wallet->user_id,
                'qr_wallet_id' => $wallet->id,
                'qr_code_id' => $qrCode->id,
                'type' => QrTransaction::TYPE_DEBIT,
                'amount_ghs' => round($price, 4),
                'balance_after_ghs' => $balanceAfter,
                'reference' => $reference,
                'status' => 'completed',
                'description' => sprintf('Created QR code: %s', $qrCode->label),
                'metadata' => ['qr_code_id' => $qrCode->id],
            ]);
        });
    }
}