<?php

namespace App\Services\Pos;

use App\Models\User;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class BillingClient
{
    public function configured(): bool
    {
        return (string) config('billing.api_url', '') !== '' && (string) config('billing.api_key', '') !== '';
    }

    /**
     * @return array{ok: bool, insufficient: bool, balance_minor: ?int, error: ?string}
     */
    public function charge(User $user, int $amountMinor, string $reference, string $description): array
    {
        if (! $this->configured()) {
            return ['ok' => false, 'insufficient' => false, 'balance_minor' => null, 'error' => 'Billing is not configured.'];
        }

        try {
            $res = Http::withToken((string) config('billing.api_key'))
                ->acceptJson()->timeout(20)
                ->post(rtrim((string) config('billing.api_url'), '/').'/debit', [
                    'user' => $user->public_id,
                    'amount_minor' => $amountMinor,
                    'service' => 'pos',
                    'source' => 'subscription',
                    'reference' => $reference,
                    'description' => $description,
                ]);
        } catch (\Throwable $e) {
            Log::warning('POS BillingClient: charge failed', ['user' => $user->public_id, 'error' => $e->getMessage()]);

            return ['ok' => false, 'insufficient' => false, 'balance_minor' => null, 'error' => 'Could not reach the billing service.'];
        }

        if ($res->status() === 402) {
            return ['ok' => false, 'insufficient' => true, 'balance_minor' => (int) $res->json('balance_minor', 0), 'error' => 'Insufficient wallet balance.'];
        }

        if ($res->failed()) {
            return ['ok' => false, 'insufficient' => false, 'balance_minor' => null, 'error' => 'Billing error ('.$res->status().').'];
        }

        return ['ok' => true, 'insufficient' => false, 'balance_minor' => null, 'error' => null];
    }
}