<?php

namespace OCA\Gestion\Service;

use Throwable;
use Dompdf\Dompdf;
use Dompdf\Options;
use OCA\Gestion\Exception\TemplateException;

class HtmlToPdfService
{
    private $templatesPath;
    private $assetsPath;

    public function __construct()
    {
        $this->templatesPath = __DIR__ . '/../../templates/pdf/';
        $this->assetsPath = '/var/www/html/data/admin/files/.gestion/';
    }

    public function generatePdf($templateName, $data, $options = [])
    {
        try {
            $htmlContent = $this->renderPhpTemplate($templateName, $data);
            return $this->convertToPdf($htmlContent, $options);
        } catch (\Exception $e) {
            error_log('HtmlToPdfService Error: ' . $e->getMessage());
            throw new TemplateException('Erreur génération PDF: ' . $e->getMessage());
        }
    }

    /**
     * Rend un template PHP avec les données
     */
    private function renderPhpTemplate($templateName, $data)
    {
        $templateFile = $this->templatesPath . $templateName . '.php';

        if (!file_exists($templateFile)) {
            throw new TemplateException("Template introuvable: " . $templateFile);
        }

        try {
            $templateData = array_merge($data, [
                'logo_base64' => $this->getLogoBase64()
            ]);

            extract($templateData);

            ob_start();
            include $templateFile;
            return ob_get_clean();

        } catch (Throwable $e) {
            ob_end_clean();
            throw new TemplateException("Erreur lors du rendu du template: " . $e->getMessage(), 0, $e);
        }
    }

    /**
     * Récupère le logo en base64
     */
    private function getLogoBase64()
    {
        $logoPath = $this->assetsPath . 'logo.png';

        if (file_exists($logoPath)) {
            return base64_encode(file_get_contents($logoPath));
        }

        // Retour d'un pixel transparent si pas de logo
        return 'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNkYPhfDwAChwGA60e6kgAAAABJRU5ErkJggg==';
    }

    /**
     * Convertit HTML en PDF
     */
    private function convertToPdf($htmlContent, $options = [])
    {
        $dompdfOptions = new Options();
        $dompdfOptions->set('defaultFont', 'DejaVu Sans');
        $dompdfOptions->set('isRemoteEnabled', true);
        $dompdfOptions->set('isHtml5ParserEnabled', true);
        $dompdfOptions->set('enable_css_float', true);
        $dompdfOptions->set('enable_font_subsetting', true);

        $paper = $options['paper'] ?? 'A4';
        $orientation = $options['orientation'] ?? 'portrait';

        $dompdf = new Dompdf($dompdfOptions);
        $dompdf->loadHtml($htmlContent);
        $dompdf->setPaper($paper, $orientation);
        $dompdf->render();

        return $dompdf->output();
    }

    public function generateInvoiceFilename($factureData, $prefix = 'FACTURE')
    {
        $numero = str_pad($factureData['num'] ?? '', 6, '0', STR_PAD_LEFT);
        $month = str_pad($factureData['month'] ?? date('m'), 2, '0', STR_PAD_LEFT);
        $year = $factureData['year'] ?? date('Y');

        return "{$prefix}_{$numero}_{$month}_{$year}.pdf";
    }

    /**
     * Debug template PHP
     */
    public function debugTemplate($templateName, $data)
    {
        echo "=== DONNÉES REÇUES ===\n";
        var_dump($data);

        echo "\n=== TEMPLATE PHP UTILISÉ ===\n";
        $templateFile = $this->templatesPath . $templateName . '.php';
        echo "Fichier: $templateFile\n";
        echo "Existe: " . (file_exists($templateFile) ? "OUI" : "NON") . "\n";

        echo "\n=== HTML GÉNÉRÉ ===\n";
        $html = $this->renderPhpTemplate($templateName, $data);
        echo substr($html, 0, 2000) . "...\n";

        return $html;
    }
}