<?php

namespace App\Services\Billing;

use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class PlatformSmsClient
{
    private ?string $lastError = null;

    public function lastError(): ?string
    {
        return $this->lastError;
    }

    private function base(): string
    {
        return rtrim((string) config('sms.platform_api_url', 'https://ladill.com/api'), '/');
    }

    private function token(): string
    {
        return (string) config('sms.platform_api_key', '');
    }

    public function isConfigured(): bool
    {
        return $this->token() !== '';
    }

    /** @return list<array<string, mixed>> */
    public function services(string $ownerPublicId): array
    {
        if (! $this->isConfigured()) {
            return [];
        }

        try {
            $res = Http::withToken($this->token())->acceptJson()->timeout(15)
                ->get($this->base().'/sms/services', ['user' => $ownerPublicId]);

            if ($res->failed()) {
                return [];
            }

            return (array) ($res->json('data') ?? []);
        } catch (\Throwable $e) {
            Log::warning('Care platform SMS services lookup failed', ['error' => $e->getMessage()]);

            return [];
        }
    }

    public function ensureServiceId(string $ownerPublicId): ?int
    {
        $services = $this->services($ownerPublicId);
        if ($services !== []) {
            return (int) ($services[0]['id'] ?? 0) ?: null;
        }

        if (! $this->isConfigured()) {
            return null;
        }

        try {
            $res = Http::withToken($this->token())->acceptJson()->timeout(15)
                ->post($this->base().'/sms/services', [
                    'user' => $ownerPublicId,
                    'name' => 'Ladill Care',
                    'brand_name' => 'Care',
                ]);

            if ($res->failed()) {
                $this->lastError = (string) ($res->json('error') ?: 'Could not create an SMS service for this account.');

                return null;
            }

            return (int) ($res->json('data.id') ?? 0) ?: null;
        } catch (\Throwable $e) {
            Log::warning('Care platform SMS service create failed', ['error' => $e->getMessage()]);
            $this->lastError = 'Could not reach the SMS service.';

            return null;
        }
    }

    public function send(string $ownerPublicId, string $to, string $message, ?string $senderId = null): bool
    {
        $this->lastError = null;

        if (! $this->isConfigured()) {
            $this->lastError = 'SMS is not configured on this Care instance. Set SMS_API_KEY_CARE.';

            return false;
        }

        $serviceId = $this->ensureServiceId($ownerPublicId);
        if (! $serviceId) {
            $this->lastError ??= 'No SMS service is available for this account. Open sms.ladill.com once, then retry.';

            return false;
        }

        try {
            $res = Http::withToken($this->token())->acceptJson()->timeout(30)
                ->post($this->base().'/sms/messages/send', array_filter([
                    'user' => $ownerPublicId,
                    'sms_service_id' => $serviceId,
                    'to' => $to,
                    'text' => $message,
                    'sender_id' => $senderId ?? config('sms.default_sender_id'),
                ]));

            if ($res->status() === 402) {
                $this->lastError = (string) ($res->json('error') ?: 'Insufficient SMS credit. Top up your Ladill SMS wallet and try again.');
                Log::warning('Care platform SMS send: insufficient balance', ['user' => $ownerPublicId]);

                return false;
            }

            if ($res->failed()) {
                $this->lastError = (string) ($res->json('error') ?: $res->json('message') ?: 'The SMS could not be sent.');
                Log::warning('Care platform SMS send failed', ['status' => $res->status(), 'body' => $res->body()]);

                return false;
            }

            return (bool) ($res->json('success') ?? true);
        } catch (\Throwable $e) {
            $this->lastError = 'Could not reach the SMS service. Please try again.';
            Log::warning('Care platform SMS send error', ['error' => $e->getMessage()]);

            return false;
        }
    }
}