<?php

namespace App\Helpers;

use Illuminate\Support\Facades\Http;
use RuntimeException;

class WhatsappHelper
{
    public static function send(string $target, string $message): bool
    {
        $target = self::normalizePhone($target);
        $provider = strtolower((string) config('services.whatsapp.provider', 'fonnte'));

        if ($provider === 'waha') {
            $baseUrl = rtrim((string) config('services.whatsapp.waha_url'), '/');
            if ($baseUrl === '') {
                throw new RuntimeException('WAHA_URL belum dikonfigurasi.');
            }

            $headers = [];
            if ($key = config('services.whatsapp.waha_api_key')) {
                $headers['X-Api-Key'] = $key;
            }

            $response = Http::timeout(8)->withHeaders($headers)->post($baseUrl . '/api/sendText', [
                'session' => config('services.whatsapp.waha_session', 'default'),
                'chatId' => $target . '@c.us',
                'text' => $message,
            ]);

            if (!$response->successful()) {
                throw new RuntimeException('WAHA gagal mengirim pesan: HTTP ' . $response->status());
            }
            return true;
        }

        $token = (string) config('services.whatsapp.fonnte_token');
        if ($token === '') {
            throw new RuntimeException('FONNTE_TOKEN belum dikonfigurasi.');
        }

        $response = Http::asForm()->timeout(8)->withHeaders([
            'Authorization' => $token,
        ])->post('https://api.fonnte.com/send', [
            'target' => $target,
            'message' => $message,
        ]);

        if (!$response->successful()) {
            throw new RuntimeException('Fonnte gagal mengirim pesan: HTTP ' . $response->status());
        }

        return true;
    }

    public static function configured(): bool
    {
        $provider = strtolower((string) config('services.whatsapp.provider', 'fonnte'));
        return $provider === 'waha'
            ? (string) config('services.whatsapp.waha_url') !== ''
            : (string) config('services.whatsapp.fonnte_token') !== '';
    }

    public static function normalizePhone(string $phone): string
    {
        $phone = preg_replace('/\D+/', '', $phone) ?: '';
        if (str_starts_with($phone, '0')) {
            $phone = '62' . substr($phone, 1);
        }
        if (!str_starts_with($phone, '62')) {
            $phone = '62' . ltrim($phone, '0');
        }
        return $phone;
    }
}