<?php

namespace App\Services;

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

class OcrExtractionService
{
    private string $url;
    private string $token;

    public function __construct()
    {
        $this->url   = self::normalizarUrl(ChatConfig::get('ocr_url', ''));
        $this->token = ChatConfig::get('ocr_token', '');
    }

    /** Acepta tanto "https://host" como "https://host/extract" (error comun de configuracion). */
    public static function normalizarUrl(string $url): string
    {
        $url = rtrim(trim($url), '/');
        return preg_replace('#/extract$#', '', $url);
    }

    public function habilitado(): bool
    {
        return ChatConfig::get('ocr_habilitado', '0') === '1' && $this->url !== '';
    }

    /** Envia la imagen al servicio OCR externo y devuelve el texto crudo, o null si falla. */
    public function extraerTexto(string $base64, string $mimeType): ?string
    {
        if (! $this->url) {
            return null;
        }

        try {
            $response = Http::withToken($this->token)
                ->timeout(20)
                ->post("{$this->url}/extract", [
                    'image_base64' => $base64,
                    'mime_type'    => $mimeType,
                ]);

            if (! $response->successful()) {
                Log::warning('[OCR] HTTP ' . $response->status() . ': ' . substr($response->body(), 0, 300));
                return null;
            }

            $data = $response->json();

            if (! ($data['success'] ?? false) || empty($data['text'])) {
                Log::warning('[OCR] respuesta sin texto util: ' . substr($response->body(), 0, 300));
                return null;
            }

            return $data['text'];

        } catch (\Throwable $e) {
            Log::warning('[OCR] excepcion: ' . $e->getMessage());
            return null;
        }
    }
}