<?php

namespace App\Services\Link;

use App\Models\LinkTransaction;
use App\Models\LinkWallet;
use App\Models\ShortLink;
use App\Models\User;
use App\Services\Billing\BillingClient;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use RuntimeException;

class LinkBillingService
{
    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(LinkWallet::pricePerLink() * 100);

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

    public function debitForLinkCreation(LinkWallet $wallet, ShortLink $link): LinkTransaction
    {
        $price = LinkWallet::pricePerLink();
        $priceMinor = (int) round($price * 100);
        $user = $wallet->user;
        $reference = 'LINK-DEBIT-'.strtoupper(Str::random(12));

        return DB::transaction(function () use ($wallet, $user, $link, $price, $priceMinor, $reference) {
            $ok = $this->billing->debit(
                $user->public_id,
                $priceMinor,
                'link',
                'link_create',
                $reference,
                $link->id,
                sprintf('Created short link: %s', $link->label ?: $link->slug),
            );

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

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

            return LinkTransaction::create([
                'user_id' => $wallet->user_id,
                'link_wallet_id' => $wallet->id,
                'short_link_id' => $link->id,
                'type' => LinkTransaction::TYPE_DEBIT,
                'amount_ghs' => round($price, 4),
                'balance_after_ghs' => $balanceAfter,
                'reference' => $reference,
                'status' => 'completed',
                'description' => sprintf('Created short link: %s', $link->label ?: $link->slug),
                'metadata' => ['short_link_id' => $link->id],
            ]);
        });
    }
}