<?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.
 */

/**
 * \file    bankimport/class/bankimportcron.class.php
 * \ingroup bankimport
 * \brief   Cron job class for automatic bank statement import
 */

require_once DOL_DOCUMENT_ROOT.'/core/class/commonobject.class.php';
dol_include_once('/bankimport/class/fints.class.php');
dol_include_once('/bankimport/class/banktransaction.class.php');

/**
 * Class BankImportCron
 * Handles automatic bank statement import via scheduled task
 */
class BankImportCron
{
	/**
	 * @var DoliDB Database handler
	 */
	public $db;

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

	/**
	 * @var array Error messages
	 */
	public $errors = array();

	/**
	 * @var string Output message for cron log
	 */
	public $output = '';

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

	/**
	 * Execute the automatic import cron job
	 * Called by Dolibarr's scheduled task system
	 *
	 * @return int 0 if OK, < 0 if error
	 */
	public function doAutoImport()
	{
		global $conf, $langs, $user;

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

		dol_syslog("BankImportCron::doAutoImport - Starting automatic import", LOG_INFO);

		// Check if automatic import is enabled
		if (!getDolGlobalInt('BANKIMPORT_AUTO_ENABLED')) {
			$this->output = $langs->trans('AutoImportDisabled');
			dol_syslog("BankImportCron::doAutoImport - Auto import is disabled", LOG_INFO);
			return 0;
		}

		// Initialize FinTS
		$fints = new BankImportFinTS($this->db);

		if (!$fints->isConfigured()) {
			$this->error = $langs->trans('AutoImportNotConfigured');
			dol_syslog("BankImportCron::doAutoImport - FinTS not configured", LOG_WARNING);
			$this->setNotification('config_error');
			return -1;
		}

		if (!$fints->isLibraryAvailable()) {
			$this->error = $langs->trans('FinTSLibraryNotFound');
			dol_syslog("BankImportCron::doAutoImport - Library not found", LOG_ERR);
			return -1;
		}

		// Check for stored session state (from previous successful TAN)
		$storedState = getDolGlobalString('BANKIMPORT_CRON_STATE');
		$sessionRestored = false;

		try {
			// Try to restore previous session
			if (!empty($storedState)) {
				dol_syslog("BankImportCron::doAutoImport - Attempting to restore previous session (state length: ".strlen($storedState).")", LOG_INFO);
				$restoreResult = $fints->restore($storedState);
				if ($restoreResult < 0) {
					// Session expired, need fresh login
					dol_syslog("BankImportCron::doAutoImport - Session restore failed: ".$fints->error.", trying fresh login", LOG_WARNING);
					$storedState = '';
					// Clear stale session
					dolibarr_del_const($this->db, 'BANKIMPORT_CRON_STATE', $conf->entity);
				} else {
					dol_syslog("BankImportCron::doAutoImport - Session restored successfully", LOG_INFO);
					$sessionRestored = true;
				}
			} else {
				dol_syslog("BankImportCron::doAutoImport - No stored session found", LOG_INFO);
			}

			// If no stored session or restore failed, try fresh login
			if (empty($storedState)) {
				dol_syslog("BankImportCron::doAutoImport - Attempting fresh login", LOG_INFO);
				$loginResult = $fints->login();

				if ($loginResult < 0) {
					$this->error = $langs->trans('LoginFailed').': '.$fints->error;
					dol_syslog("BankImportCron::doAutoImport - Login failed: ".$fints->error, LOG_ERR);
					$this->setNotification('login_error');
					return -1;
				}

				if ($loginResult == 0) {
					// TAN required - can't proceed automatically
					$this->output = $langs->trans('TANRequired');
					dol_syslog("BankImportCron::doAutoImport - TAN required for login, cannot proceed automatically", LOG_WARNING);
					$this->setNotification('tan_required');

					// Store the state so user can complete TAN manually
					$state = $fints->persist();
					if (!empty($state)) {
						dolibarr_set_const($this->db, 'BANKIMPORT_CRON_PENDING_STATE', $state, 'chaine', 0, '', $conf->entity);
						dolibarr_set_const($this->db, 'BANKIMPORT_CRON_PENDING_ACTION', serialize($fints->getPendingAction()), 'chaine', 0, '', $conf->entity);
					}
					return 0; // Not an error, just can't proceed
				}

				dol_syslog("BankImportCron::doAutoImport - Fresh login successful", LOG_INFO);
			}

			// Login successful or session restored - fetch statements
			$daysToFetch = getDolGlobalInt('BANKIMPORT_AUTO_DAYS') ?: 30;
			$dateFrom = strtotime("-{$daysToFetch} days");
			$dateTo = time();

			dol_syslog("BankImportCron::doAutoImport - Fetching statements from ".date('Y-m-d', $dateFrom)." to ".date('Y-m-d', $dateTo)." ({$daysToFetch} days)", LOG_INFO);

			$result = $fints->fetchStatements($dateFrom, $dateTo);

			// Log what we got back
			if (is_array($result)) {
				$txCount = count($result['transactions'] ?? array());
				$hasBalance = !empty($result['balance']);
				$isPartial = !empty($result['partial']);
				dol_syslog("BankImportCron::doAutoImport - fetchStatements returned array: transactions={$txCount}, hasBalance=".($hasBalance?'yes':'no').", partial=".($isPartial?'yes':'no'), LOG_INFO);
			} else {
				dol_syslog("BankImportCron::doAutoImport - fetchStatements returned: ".var_export($result, true), LOG_INFO);
			}

			if ($result === 0) {
				// TAN required for statements
				$this->output = $langs->trans('TANRequired');
				dol_syslog("BankImportCron::doAutoImport - TAN required for statements", LOG_WARNING);
				$this->setNotification('tan_required');

				// Store state for manual completion
				$state = $fints->persist();
				if (!empty($state)) {
					dolibarr_set_const($this->db, 'BANKIMPORT_CRON_PENDING_STATE', $state, 'chaine', 0, '', $conf->entity);
					dolibarr_set_const($this->db, 'BANKIMPORT_CRON_PENDING_ACTION', serialize($fints->getPendingAction()), 'chaine', 0, '', $conf->entity);
				}
				return 0;
			}

			if ($result < 0) {
				$this->error = $langs->trans('FetchFailed').': '.$fints->error;
				dol_syslog("BankImportCron::doAutoImport - Fetch failed: ".$fints->error, LOG_ERR);
				$this->setNotification('fetch_error');
				return -1;
			}

			// Success - import transactions
			$transactions = $result['transactions'] ?? array();
			$fetchedCount = count($transactions);
			$importedCount = 0;
			$skippedCount = 0;

			dol_syslog("BankImportCron::doAutoImport - Bank returned {$fetchedCount} transactions", LOG_INFO);

			// If restored session returned 0 transactions, the session might be stale
			// Try fresh login as fallback
			if ($fetchedCount == 0 && $sessionRestored) {
				dol_syslog("BankImportCron::doAutoImport - Restored session returned 0 transactions, clearing stale session", LOG_WARNING);
				dolibarr_del_const($this->db, 'BANKIMPORT_CRON_STATE', $conf->entity);

				// Note: We don't retry here because a fresh login would require TAN
				// Just mark that the session was stale
				$this->output = $langs->trans('AutoImportNoTransactions').' (Session abgelaufen - nächster Lauf erfordert TAN)';

				$this->setNotification('session_expired');

				return 0;
			}

			if (!empty($transactions)) {
				// Get a system user for the import
				$importUser = new User($this->db);
				$importUser->fetch(1); // Admin user

				$iban = $fints->getIban();

				// Use the importFromFinTS method for correct field mapping
				$transImporter = new BankImportTransaction($this->db);
				$importResult = $transImporter->importFromFinTS($transactions, $iban, $importUser);

				$importedCount = $importResult['imported'] ?? 0;
				$skippedCount = $importResult['skipped'] ?? 0;

				dol_syslog("BankImportCron::doAutoImport - Import result: imported={$importedCount}, skipped={$skippedCount}", LOG_INFO);
			}

			// Update last fetch info
			dolibarr_set_const($this->db, 'BANKIMPORT_LAST_FETCH', time(), 'chaine', 0, '', $conf->entity);
			dolibarr_set_const($this->db, 'BANKIMPORT_LAST_FETCH_COUNT', $importedCount, 'chaine', 0, '', $conf->entity);

			// Store session for next run (might avoid TAN)
			$state = $fints->persist();
			if (!empty($state)) {
				dolibarr_set_const($this->db, 'BANKIMPORT_CRON_STATE', $state, 'chaine', 0, '', $conf->entity);
			}

			// Clear any pending state
			dolibarr_del_const($this->db, 'BANKIMPORT_CRON_PENDING_STATE', $conf->entity);
			dolibarr_del_const($this->db, 'BANKIMPORT_CRON_PENDING_ACTION', $conf->entity);

			// Clear notification flag on success
			$this->clearNotification();

			$fints->close();

			if ($importedCount > 0) {
				$this->output = $langs->trans('AutoImportSuccess', $importedCount);
			} elseif ($skippedCount > 0) {
				$this->output = $langs->trans('AutoImportNoTransactions').' ('.$skippedCount.' bereits vorhanden)';
			} else {
				$this->output = $langs->trans('AutoImportNoTransactions');
			}

			dol_syslog("BankImportCron::doAutoImport - Completed: imported={$importedCount}, skipped={$skippedCount}", LOG_INFO);

			return 0;

		} catch (Exception $e) {
			$this->error = 'Exception: '.$e->getMessage();
			dol_syslog("BankImportCron::doAutoImport - Exception: ".$e->getMessage(), LOG_ERR);
			$this->setNotification('error');
			return -1;
		}
	}

	/**
	 * Set notification flag for admin users
	 *
	 * @param string $type Notification type (tan_required, error, etc.)
	 * @return void
	 */
	private function setNotification($type)
	{
		global $conf;

		dolibarr_set_const($this->db, 'BANKIMPORT_NOTIFICATION', $type, 'chaine', 0, '', $conf->entity);
		dolibarr_set_const($this->db, 'BANKIMPORT_NOTIFICATION_DATE', time(), 'chaine', 0, '', $conf->entity);
	}

	/**
	 * Clear notification flag
	 *
	 * @return void
	 */
	private function clearNotification()
	{
		global $conf;

		dolibarr_del_const($this->db, 'BANKIMPORT_NOTIFICATION', $conf->entity);
		dolibarr_del_const($this->db, 'BANKIMPORT_NOTIFICATION_DATE', $conf->entity);
	}

	/**
	 * Check if there's a pending notification
	 *
	 * @return array|null Notification info or null
	 */
	public static function getNotification()
	{
		$type = getDolGlobalString('BANKIMPORT_NOTIFICATION');
		$date = getDolGlobalInt('BANKIMPORT_NOTIFICATION_DATE');

		if (empty($type)) {
			return null;
		}

		return array(
			'type' => $type,
			'date' => $date
		);
	}

	/**
	 * Resume a pending TAN action (called from web interface)
	 *
	 * @return int 1 if TAN confirmed and import done, 0 if still waiting, -1 if error
	 */
	public function resumePendingAction()
	{
		global $conf, $langs, $user;

		$pendingState = getDolGlobalString('BANKIMPORT_CRON_PENDING_STATE');
		$pendingAction = getDolGlobalString('BANKIMPORT_CRON_PENDING_ACTION');

		if (empty($pendingState) || empty($pendingAction)) {
			$this->error = 'No pending action';
			return -1;
		}

		$fints = new BankImportFinTS($this->db);

		$restoreResult = $fints->restore($pendingState);
		if ($restoreResult < 0) {
			$this->error = $fints->error;
			// Clear expired state
			dolibarr_del_const($this->db, 'BANKIMPORT_CRON_PENDING_STATE', $conf->entity);
			dolibarr_del_const($this->db, 'BANKIMPORT_CRON_PENDING_ACTION', $conf->entity);
			return -1;
		}

		$action = @unserialize($pendingAction);
		if ($action === false) {
			$this->error = 'Could not restore pending action';
			return -1;
		}

		$fints->setPendingAction($action);

		// Check if TAN was confirmed
		$checkResult = $fints->checkDecoupledTan();

		if ($checkResult == 0) {
			// Still waiting
			// Update state
			$newState = $fints->persist();
			if (!empty($newState)) {
				dolibarr_set_const($this->db, 'BANKIMPORT_CRON_PENDING_STATE', $newState, 'chaine', 0, '', $conf->entity);
			}
			return 0;
		}

		if ($checkResult < 0) {
			$this->error = $fints->error;
			return -1;
		}

		// TAN confirmed - now run the import
		dolibarr_del_const($this->db, 'BANKIMPORT_CRON_PENDING_STATE', $conf->entity);
		dolibarr_del_const($this->db, 'BANKIMPORT_CRON_PENDING_ACTION', $conf->entity);

		// Store the confirmed session and run import
		$state = $fints->persist();
		if (!empty($state)) {
			dolibarr_set_const($this->db, 'BANKIMPORT_CRON_STATE', $state, 'chaine', 0, '', $conf->entity);
		}

		return $this->doAutoImport();
	}
}