<?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    globalnotify/class/globalnotify.class.php
 * \ingroup globalnotify
 * \brief   Global notification manager class
 */

/**
 * Class GlobalNotify
 * Manages global notifications from all modules
 */
class GlobalNotify
{
	/**
	 * @var DoliDB Database handler
	 */
	public $db;

	/**
	 * Notification types with styling
	 */
	const TYPE_ERROR = 'error';
	const TYPE_WARNING = 'warning';
	const TYPE_INFO = 'info';
	const TYPE_SUCCESS = 'success';
	const TYPE_ACTION = 'action';  // Requires user action

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

	/**
	 * Add a notification
	 *
	 * @param string $module     Module name (e.g., 'bankimport', 'importzugferd')
	 * @param string $type       Notification type (error, warning, info, success, action)
	 * @param string $title      Short title
	 * @param string $message    Detailed message
	 * @param string $actionUrl  URL for action button (optional)
	 * @param string $actionLabel Label for action button (optional)
	 * @param int    $priority   Priority 1-10 (10 = highest)
	 * @param int    $userId     Specific user ID or 0 for all admins
	 * @return int Notification ID or -1 on error
	 */
	public function addNotification($module, $type, $title, $message, $actionUrl = '', $actionLabel = '', $priority = 5, $userId = 0)
	{
		global $conf;

		// Store in llx_const as JSON array
		$key = 'GLOBALNOTIFY_'.strtoupper($module);

		$notification = array(
			'id' => uniqid($module.'_'),
			'module' => $module,
			'type' => $type,
			'title' => $title,
			'message' => $message,
			'action_url' => $actionUrl,
			'action_label' => $actionLabel,
			'priority' => $priority,
			'user_id' => $userId,
			'created' => time(),
			'read' => false
		);

		// Get existing notifications for this module
		$existing = $this->getModuleNotifications($module);
		$existing[] = $notification;

		// Keep only last 50 notifications per module
		if (count($existing) > 50) {
			$existing = array_slice($existing, -50);
		}

		$result = dolibarr_set_const($this->db, $key, json_encode($existing), 'chaine', 0, '', $conf->entity);

		return $result > 0 ? $notification['id'] : -1;
	}

	/**
	 * Get notifications for a specific module
	 *
	 * @param string $module Module name
	 * @return array Notifications
	 */
	public function getModuleNotifications($module)
	{
		$key = 'GLOBALNOTIFY_'.strtoupper($module);
		$data = getDolGlobalString($key);

		if (empty($data)) {
			return array();
		}

		$notifications = json_decode($data, true);
		return is_array($notifications) ? $notifications : array();
	}

	/**
	 * Get all active notifications for current user
	 *
	 * @param int $userId User ID
	 * @param bool $unreadOnly Only return unread notifications
	 * @return array All notifications sorted by priority and date
	 */
	public function getAllNotifications($userId = 0, $unreadOnly = true)
	{
		global $user;

		if ($userId == 0) {
			$userId = $user->id;
		}

		$allNotifications = array();

		// Get all notification constants (exclude internal settings)
		$sql = "SELECT name, value FROM ".MAIN_DB_PREFIX."const WHERE name LIKE 'GLOBALNOTIFY_%' AND name NOT LIKE 'GLOBALNOTIFY_CRON%' AND value != '' AND value LIKE '[%'";
		$resql = $this->db->query($sql);

		if ($resql) {
			while ($obj = $this->db->fetch_object($resql)) {
				$notifications = json_decode($obj->value, true);
				if (is_array($notifications)) {
					foreach ($notifications as $notif) {
						// Filter by user if specified in notification
						if (!empty($notif['user_id']) && $notif['user_id'] != $userId) {
							continue;
						}
						// Filter by read status
						if ($unreadOnly && !empty($notif['read'])) {
							continue;
						}
						$allNotifications[] = $notif;
					}
				}
			}
		}

		// Sort by priority (desc) and date (desc)
		usort($allNotifications, function($a, $b) {
			if ($a['priority'] != $b['priority']) {
				return $b['priority'] - $a['priority'];
			}
			return $b['created'] - $a['created'];
		});

		return $allNotifications;
	}

	/**
	 * Get read notifications for history display
	 *
	 * @param int $userId User ID
	 * @param int $limit  Maximum number to return
	 * @return array Read notifications sorted by date (newest first)
	 */
	public function getReadNotifications($userId = 0, $limit = 20)
	{
		global $user;

		if ($userId == 0) {
			$userId = $user->id;
		}

		$readNotifications = array();

		// Get all notification constants (exclude internal settings)
		$sql = "SELECT name, value FROM ".MAIN_DB_PREFIX."const WHERE name LIKE 'GLOBALNOTIFY_%' AND name NOT LIKE 'GLOBALNOTIFY_CRON%' AND value != '' AND value LIKE '[%'";
		$resql = $this->db->query($sql);

		if ($resql) {
			while ($obj = $this->db->fetch_object($resql)) {
				$notifications = json_decode($obj->value, true);
				if (is_array($notifications)) {
					foreach ($notifications as $notif) {
						// Filter by user if specified
						if (!empty($notif['user_id']) && $notif['user_id'] != $userId) {
							continue;
						}
						// Only read notifications
						if (!empty($notif['read'])) {
							$readNotifications[] = $notif;
						}
					}
				}
			}
		}

		// Sort by date (newest first)
		usort($readNotifications, function($a, $b) {
			return $b['created'] - $a['created'];
		});

		// Limit results
		return array_slice($readNotifications, 0, $limit);
	}

	/**
	 * Mark notification as read
	 *
	 * @param string $notificationId Notification ID
	 * @return bool Success
	 */
	public function markAsRead($notificationId)
	{
		global $conf;

		// Find which module this notification belongs to
		$sql = "SELECT name, value FROM ".MAIN_DB_PREFIX."const WHERE name LIKE 'GLOBALNOTIFY_%' AND value LIKE '%".addslashes($notificationId)."%'";
		$resql = $this->db->query($sql);

		if ($resql && $obj = $this->db->fetch_object($resql)) {
			$notifications = json_decode($obj->value, true);
			if (is_array($notifications)) {
				foreach ($notifications as &$notif) {
					if ($notif['id'] == $notificationId) {
						$notif['read'] = true;
						break;
					}
				}
				dolibarr_set_const($this->db, $obj->name, json_encode($notifications), 'chaine', 0, '', $conf->entity);
				return true;
			}
		}

		return false;
	}

	/**
	 * Mark all notifications as read
	 *
	 * @param string $module Optional: only for specific module
	 * @return int Number of notifications marked as read
	 */
	public function markAllAsRead($module = '')
	{
		global $conf;

		$count = 0;
		$sql = "SELECT name, value FROM ".MAIN_DB_PREFIX."const WHERE name LIKE 'GLOBALNOTIFY_%'";
		if (!empty($module)) {
			$sql .= " AND name = 'GLOBALNOTIFY_".strtoupper($module)."'";
		}

		$resql = $this->db->query($sql);
		if ($resql) {
			while ($obj = $this->db->fetch_object($resql)) {
				$notifications = json_decode($obj->value, true);
				if (is_array($notifications)) {
					$changed = false;
					foreach ($notifications as &$notif) {
						if (empty($notif['read'])) {
							$notif['read'] = true;
							$changed = true;
							$count++;
						}
					}
					if ($changed) {
						dolibarr_set_const($this->db, $obj->name, json_encode($notifications), 'chaine', 0, '', $conf->entity);
					}
				}
			}
		}

		return $count;
	}

	/**
	 * Delete a notification
	 *
	 * @param string $notificationId Notification ID
	 * @return bool Success
	 */
	public function deleteNotification($notificationId)
	{
		global $conf;

		$sql = "SELECT name, value FROM ".MAIN_DB_PREFIX."const WHERE name LIKE 'GLOBALNOTIFY_%' AND value LIKE '%".addslashes($notificationId)."%'";
		$resql = $this->db->query($sql);

		if ($resql && $obj = $this->db->fetch_object($resql)) {
			$notifications = json_decode($obj->value, true);
			if (is_array($notifications)) {
				$notifications = array_filter($notifications, function($n) use ($notificationId) {
					return $n['id'] != $notificationId;
				});
				dolibarr_set_const($this->db, $obj->name, json_encode(array_values($notifications)), 'chaine', 0, '', $conf->entity);
				return true;
			}
		}

		return false;
	}

	/**
	 * Clear all notifications for a module
	 *
	 * @param string $module Module name
	 * @return bool Success
	 */
	public function clearModuleNotifications($module)
	{
		global $conf;

		$key = 'GLOBALNOTIFY_'.strtoupper($module);
		return dolibarr_del_const($this->db, $key, $conf->entity) >= 0;
	}

	/**
	 * Get unread count for badge display
	 *
	 * @return int Number of unread notifications
	 */
	public function getUnreadCount()
	{
		return count($this->getAllNotifications(0, true));
	}

	/**
	 * Helper: Add error notification
	 */
	public static function error($module, $title, $message, $actionUrl = '', $actionLabel = '')
	{
		global $db;
		$notify = new self($db);
		return $notify->addNotification($module, self::TYPE_ERROR, $title, $message, $actionUrl, $actionLabel, 10);
	}

	/**
	 * Helper: Add warning notification
	 */
	public static function warning($module, $title, $message, $actionUrl = '', $actionLabel = '')
	{
		global $db;
		$notify = new self($db);
		return $notify->addNotification($module, self::TYPE_WARNING, $title, $message, $actionUrl, $actionLabel, 7);
	}

	/**
	 * Helper: Add info notification
	 */
	public static function info($module, $title, $message, $actionUrl = '', $actionLabel = '')
	{
		global $db;
		$notify = new self($db);
		return $notify->addNotification($module, self::TYPE_INFO, $title, $message, $actionUrl, $actionLabel, 3);
	}

	/**
	 * Helper: Add action required notification
	 */
	public static function actionRequired($module, $title, $message, $actionUrl, $actionLabel = 'Aktion erforderlich')
	{
		global $db;
		$notify = new self($db);
		return $notify->addNotification($module, self::TYPE_ACTION, $title, $message, $actionUrl, $actionLabel, 9);
	}
}