<?php
/* Copyright (C) 2026 Eduard Wisch <data@data-it-solution.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

/**
 * \file    class/actions_exportzugferd.class.php
 * \ingroup exportzugferd
 * \brief   Hook class for ZUGFeRD/XRechnung export
 */

/**
 * Class ActionsExportzugferd
 * Handles hooks for ZUGFeRD export functionality
 */
class ActionsExportzugferd
{
	/**
	 * @var DoliDB Database handler
	 */
	private $db;

	/**
	 * @var string[] Errors
	 */
	public $errors = array();

	/**
	 * @var string Error message
	 */
	public $error = '';

	/**
	 * @var string Result for hooks
	 */
	public $resprints = '';

	/**
	 * Constructor
	 *
	 * @param DoliDB $db Database handler
	 */
	public function __construct($db)
	{
		$this->db = $db;
	}

	/**
	 * Hook executed after PDF/ODT creation
	 * Creates ZUGFeRD XML file alongside the document and optionally embeds it in the PDF
	 *
	 * @param array  $parameters Hook parameters
	 * @param object $object     Object (not the invoice!)
	 * @param string $action     Action
	 * @return int 0=OK, <0=Error
	 */
	public function afterPDFCreation($parameters, &$object, &$action)
	{
		global $conf, $langs;

		dol_syslog("ExportZugferd Hook: afterPDFCreation called", LOG_INFO);

		// Get the PDF file path from parameters
		$pdfFile = isset($parameters['file']) ? $parameters['file'] : '';

		if (empty($pdfFile)) {
			dol_syslog("ExportZugferd Hook: No file in parameters", LOG_INFO);
			return 0;
		}

		dol_syslog("ExportZugferd Hook: PDF file = " . $pdfFile, LOG_INFO);

		// Get the invoice from parameters
		$invoice = isset($parameters['object']) ? $parameters['object'] : null;

		// Load Facture class if needed
		if (!class_exists('Facture')) {
			require_once DOL_DOCUMENT_ROOT . '/compta/facture/class/facture.class.php';
		}

		// Check if it's a customer invoice
		if (!is_object($invoice)) {
			dol_syslog("ExportZugferd Hook: parameters[object] is not an object", LOG_INFO);
			return 0;
		}

		dol_syslog("ExportZugferd Hook: Object class = " . get_class($invoice), LOG_INFO);

		if (!($invoice instanceof Facture)) {
			dol_syslog("ExportZugferd Hook: Not a customer invoice (Facture), skipping. Class: " . get_class($invoice), LOG_INFO);
			return 0;
		}

		// Check if auto-generation is enabled
		$autoGenerate = getDolGlobalInt('EXPORTZUGFERD_AUTO_GENERATE');
		dol_syslog("ExportZugferd Hook: EXPORTZUGFERD_AUTO_GENERATE = " . $autoGenerate, LOG_INFO);

		if (!$autoGenerate) {
			dol_syslog("ExportZugferd Hook: Auto-generation disabled", LOG_INFO);
			return 0;
		}

		dol_syslog("ExportZugferd Hook: Generating ZUGFeRD XML for invoice " . $invoice->ref, LOG_INFO);

		// Generate ZUGFeRD XML and optionally embed into PDF
		return $this->generateZugferdXML($invoice, $pdfFile);
	}

	/**
	 * Hook executed after ODT creation
	 *
	 * @param array  $parameters Hook parameters
	 * @param object $object     Object
	 * @param string $action     Action
	 * @return int 0=OK, <0=Error
	 */
	public function afterODTCreation($parameters, &$object, &$action)
	{
		global $conf;

		dol_syslog("ExportZugferd Hook: afterODTCreation called", LOG_INFO);

		// Get the invoice from parameters
		$invoice = isset($parameters['object']) ? $parameters['object'] : null;

		// Load Facture class if needed
		if (!class_exists('Facture')) {
			require_once DOL_DOCUMENT_ROOT . '/compta/facture/class/facture.class.php';
		}

		// Check if it's a customer invoice
		if (!is_object($invoice) || !($invoice instanceof Facture)) {
			dol_syslog("ExportZugferd Hook: afterODTCreation - Not a Facture object", LOG_DEBUG);
			return 0;
		}

		// Check if auto-generation is enabled
		if (!getDolGlobalInt('EXPORTZUGFERD_AUTO_GENERATE')) {
			dol_syslog("ExportZugferd Hook: afterODTCreation - Auto-generation disabled", LOG_DEBUG);
			return 0;
		}

		// Get the file path from parameters (ODT or PDF depending on MAIN_ODT_AS_PDF setting)
		$file = isset($parameters['file']) ? $parameters['file'] : '';
		dol_syslog("ExportZugferd Hook: afterODTCreation - file parameter = " . $file, LOG_INFO);

		// Find PDF file - either the passed file is already PDF, or we need to find it in the directory
		$pdfFile = '';
		if (!empty($file) && pathinfo($file, PATHINFO_EXTENSION) === 'pdf') {
			$pdfFile = $file;
		} else {
			// Search for PDF in invoice directory
			$dir = $conf->facture->dir_output . '/' . dol_sanitizeFileName($invoice->ref);
			if (is_dir($dir)) {
				$files = glob($dir . '/*.pdf');
				if (!empty($files)) {
					// Get the most recently modified PDF
					usort($files, function($a, $b) {
						return filemtime($b) - filemtime($a);
					});
					$pdfFile = $files[0];
				}
			}
		}

		dol_syslog("ExportZugferd Hook: afterODTCreation - PDF file = " . $pdfFile, LOG_INFO);

		// Generate ZUGFeRD XML and embed into PDF
		return $this->generateZugferdXML($invoice, $pdfFile);
	}

	/**
	 * Generate ZUGFeRD XML for an invoice and optionally embed it into PDF
	 *
	 * @param Facture $invoice Invoice object
	 * @param string  $pdfFile Optional path to PDF file for embedding
	 * @return int 0=OK, <0=Error
	 */
	private function generateZugferdXML($invoice, $pdfFile = '')
	{
		global $conf;

		require_once __DIR__ . '/zugferdgenerator.class.php';

		$generator = new ZugferdGenerator($this->db);

		// Generate XML
		$xml = $generator->generateFromInvoice($invoice);

		if ($xml === false) {
			$this->error = $generator->error;
			$this->errors = $generator->errors;
			dol_syslog("ExportZugferd: Error generating XML: " . $this->error, LOG_ERR);
			return -1;
		}

		// Save XML file
		$filepath = $generator->saveXML($invoice, $xml);

		if ($filepath === false) {
			$this->error = $generator->error;
			dol_syslog("ExportZugferd: Error saving XML: " . $this->error, LOG_ERR);
			return -1;
		}

		dol_syslog("ExportZugferd: XML generated successfully: " . $filepath, LOG_INFO);

		// Embed XML into PDF if enabled and PDF file exists
		$embedEnabled = getDolGlobalInt('EXPORTZUGFERD_EMBED_IN_PDF');
		dol_syslog("ExportZugferd: EXPORTZUGFERD_EMBED_IN_PDF = " . $embedEnabled . ", pdfFile = " . $pdfFile, LOG_INFO);

		if ($embedEnabled && !empty($pdfFile) && file_exists($pdfFile)) {
			dol_syslog("ExportZugferd: Starting PDF embedding...", LOG_INFO);
			$result = $this->embedXmlInPdf($pdfFile, $filepath);
			if ($result < 0) {
				dol_syslog("ExportZugferd: Warning - Could not embed XML in PDF: " . $this->error, LOG_WARNING);
				// Don't return error, XML file was created successfully
			} else {
				dol_syslog("ExportZugferd: XML successfully embedded in PDF", LOG_INFO);
				// Delete XML file after embedding if option is enabled
				if (getDolGlobalInt('EXPORTZUGFERD_DELETE_XML_AFTER_EMBED')) {
					@unlink($filepath);
					dol_syslog("ExportZugferd: XML file deleted after embedding: " . $filepath, LOG_INFO);
				}
			}
		} elseif ($embedEnabled && empty($pdfFile)) {
			dol_syslog("ExportZugferd: Embedding enabled but no PDF file path provided", LOG_WARNING);
		} elseif ($embedEnabled && !file_exists($pdfFile)) {
			dol_syslog("ExportZugferd: Embedding enabled but PDF file does not exist: " . $pdfFile, LOG_WARNING);
		}

		return 0;
	}

	/**
	 * Embed XML file into PDF
	 *
	 * @param string $pdfFile Path to PDF file
	 * @param string $xmlFile Path to XML file
	 * @return int 0=OK, <0=Error
	 */
	private function embedXmlInPdf($pdfFile, $xmlFile)
	{
		require_once __DIR__ . '/pdfembedder.class.php';

		$embedder = new ZugferdPdfEmbedder();

		$profile = getDolGlobalString('EXPORTZUGFERD_PROFILE', 'EN16931');

		if (!$embedder->embedXmlInPdf($pdfFile, $xmlFile, $profile)) {
			$this->error = $embedder->error;
			$this->errors = $embedder->errors;
			return -1;
		}

		dol_syslog("ExportZugferd: XML embedded into PDF successfully: " . $pdfFile, LOG_INFO);
		return 0;
	}

	/**
	 * Hook to add buttons/actions on invoice card
	 * Now disabled - buttons are shown in document area via formObjectOptions
	 *
	 * @param array  $parameters Hook parameters
	 * @param object $object     Invoice object
	 * @param string $action     Action
	 * @return int 0=OK
	 */
	public function addMoreActionsButtons($parameters, &$object, &$action)
	{
		// Buttons are now shown in the document area (formObjectOptions) to reduce clutter
		return 0;
	}

	/**
	 * Hook to add ZUGFeRD info and mini buttons in invoice info area
	 *
	 * @param array  $parameters Hook parameters
	 * @param object $object     Object
	 * @param string $action     Action
	 * @return int 0=OK
	 */
	public function formObjectOptions($parameters, &$object, &$action)
	{
		global $conf, $langs, $user;

		// Only for invoice card context
		$contexts = explode(':', $parameters['context']);
		if (!in_array('invoicecard', $contexts)) {
			return 0;
		}

		// Check if it's a Facture
		if (!($object instanceof Facture) || empty($object->ref)) {
			return 0;
		}

		// Check permissions
		$hasRight = $user->hasRight('exportzugferd', 'read') || $user->hasRight('exportzugferd', 'export') || $user->hasRight('facture', 'lire');
		if (!$hasRight) {
			return 0;
		}

		$langs->load('exportzugferd@exportzugferd');

		$dir = $conf->facture->dir_output . '/' . dol_sanitizeFileName($object->ref);
		$zugferdFile = $dir . '/factur-x.xml';
		$xrechnungFile = $dir . '/xrechnung-' . $object->ref . '.xml';

		$xmlFile = null;
		$xmlExists = false;
		if (file_exists($zugferdFile)) {
			$xmlFile = $zugferdFile;
			$xmlExists = true;
		} elseif (file_exists($xrechnungFile)) {
			$xmlFile = $xrechnungFile;
			$xmlExists = true;
		}

		// Build the ZUGFeRD row with mini action buttons
		print '<tr class="oddeven">';
		print '<td class="titlefield">ZUGFeRD/XRechnung</td>';
		print '<td>';

		if ($xmlExists) {
			// XML exists - show file info and action buttons
			print '<span class="fa fa-file-code paddingright" style="color: #28a745;"></span>';
			print '<a href="' . dol_buildpath('/exportzugferd/download.php', 1) . '?id=' . $object->id . '&action=download_xml" title="' . $langs->trans('DownloadZugferdXML') . '">';
			print basename($xmlFile);
			print '</a>';
			print ' <span class="opacitymedium">(' . dol_print_size(filesize($xmlFile)) . ')</span>';

			// Mini buttons
			print ' &nbsp; ';
			print '<a class="paddingleft paddingright" href="' . dol_buildpath('/exportzugferd/preview.php', 1) . '?id=' . $object->id . '" title="' . $langs->trans('PreviewZugferdXML') . '">';
			print '<span class="fas fa-eye" style="color: #007bff;"></span>';
			print '</a>';

			print '<a class="paddingleft paddingright" href="' . dol_buildpath('/exportzugferd/download.php', 1) . '?id=' . $object->id . '&action=download_xml" title="' . $langs->trans('DownloadZugferdXML') . '">';
			print '<span class="fas fa-download" style="color: #17a2b8;"></span>';
			print '</a>';

			print '<a class="paddingleft paddingright" href="' . dol_buildpath('/exportzugferd/download.php', 1) . '?id=' . $object->id . '&action=generate_xml" title="' . $langs->trans('RegenerateZugferdXML') . '">';
			print '<span class="fas fa-sync-alt" style="color: #ffc107;"></span>';
			print '</a>';
		} else {
			// XML does not exist - show generate button
			print '<span class="fa fa-file-code paddingright opacitymedium"></span>';
			print '<span class="opacitymedium">' . $langs->trans('NoZugferdXML') . '</span>';

			// Generate button
			print ' &nbsp; ';
			print '<a class="paddingleft paddingright" href="' . dol_buildpath('/exportzugferd/download.php', 1) . '?id=' . $object->id . '&action=generate_xml" title="' . $langs->trans('GenerateZugferdXML') . '">';
			print '<span class="fas fa-plus-circle" style="color: #28a745;"></span> ';
			print '<span style="font-size: 0.9em;">' . $langs->trans('GenerateZugferdXML') . '</span>';
			print '</a>';
		}

		print '</td>';
		print '</tr>';

		return 0;
	}

	/**
	 * Hook to add ZUGFeRD XML to email attachments (getFormMail hook)
	 *
	 * @param array  $parameters Hook parameters
	 * @param object $object     FormMail object
	 * @param string $action     Action
	 * @return int 0=OK
	 */
	public function getFormMail($parameters, &$object, &$action)
	{
		global $conf;

		// Check if auto-attach is enabled
		if (!getDolGlobalInt('EXPORTZUGFERD_ATTACH_TO_EMAIL')) {
			return 0;
		}

		// Check if this is for an invoice (facture trackid)
		$trackid = isset($parameters['trackid']) ? $parameters['trackid'] : '';
		if (strpos($trackid, 'inv') !== 0) {
			return 0;
		}

		// Get invoice ID from parameters
		$invoiceId = isset($object->param['id']) ? $object->param['id'] : 0;
		if (empty($invoiceId)) {
			return 0;
		}

		// Load invoice to get ref
		require_once DOL_DOCUMENT_ROOT . '/compta/facture/class/facture.class.php';
		$invoice = new Facture($this->db);
		if ($invoice->fetch($invoiceId) <= 0) {
			return 0;
		}

		// Find ZUGFeRD XML file
		$xmlFile = $this->getZugferdXmlPath($invoice);

		if ($xmlFile && file_exists($xmlFile)) {
			// Add XML file to fileinit array
			if (!isset($object->param['fileinit'])) {
				$object->param['fileinit'] = array();
			}
			if (!is_array($object->param['fileinit'])) {
				$object->param['fileinit'] = array($object->param['fileinit']);
			}

			// Only add if not already in the list
			if (!in_array($xmlFile, $object->param['fileinit'])) {
				$object->param['fileinit'][] = $xmlFile;
				dol_syslog("ExportZugferd: Added ZUGFeRD XML to email attachments: " . $xmlFile, LOG_DEBUG);
			}
		}

		return 0;
	}

	/**
	 * Get the path to the ZUGFeRD XML file for an invoice
	 *
	 * @param Facture $invoice Invoice object
	 * @return string|null Path to XML file or null if not found
	 */
	private function getZugferdXmlPath($invoice)
	{
		global $conf;

		if (empty($invoice->ref)) {
			return null;
		}

		$dir = $conf->facture->dir_output . '/' . dol_sanitizeFileName($invoice->ref);
		$zugferdFile = $dir . '/factur-x.xml';
		$xrechnungFile = $dir . '/xrechnung-' . $invoice->ref . '.xml';

		if (file_exists($zugferdFile)) {
			return $zugferdFile;
		} elseif (file_exists($xrechnungFile)) {
			return $xrechnungFile;
		}

		return null;
	}
}