<?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];
    }

    /**
     * @param  array<string, mixed>  $metadata
     * @return array{checkout_url: string, reference: string}
     */
    public function initiatePlanCheckout(
        User $user,
        string $plan,
        int $months,
        int $amountMinor,
        string $returnUrl,
        array $metadata = [],
    ): array {
        $res = Http::withToken((string) config('billing.api_key'))
            ->acceptJson()->timeout(15)
            ->post(rtrim((string) config('billing.api_url'), '/').'/plan-checkout', [
                'user' => $user->public_id,
                'app' => (string) config('billing.service', 'pos'),
                'plan' => $plan,
                'months' => $months,
                'amount_minor' => $amountMinor,
                'return_url' => $returnUrl,
                'metadata' => $metadata,
            ]);
        $res->throw();

        return [
            'checkout_url' => (string) $res->json('checkout_url'),
            'reference' => (string) $res->json('reference'),
        ];
    }

    /** @return array<string, mixed> */
    public function verifyPlanCheckout(string $reference): array
    {
        $res = Http::withToken((string) config('billing.api_key'))
            ->acceptJson()->timeout(15)
            ->post(rtrim((string) config('billing.api_url'), '/').'/plan-checkout/verify', [
                'reference' => $reference,
            ]);

        if ($res->status() === 422) {
            return ['paid' => false, 'error' => $res->json('error')];
        }
        $res->throw();

        return $res->json();
    }
}