<?php

/**
 * @package     MokoSuiteBackup
 * @subpackage  com_mokosuitebackup
 * @author      Moko Consulting <hello@mokoconsulting.tech>
 * @copyright   Copyright (C) 2026 Moko Consulting. All rights reserved.
 * @license     GNU General Public License version 3 or later; see LICENSE
 *
 * Sends email notifications on backup success or failure.
 * Uses Joomla's built-in mail system (Factory::getMailer()).
 */

namespace Joomla\Component\MokoSuiteBackup\Administrator\Engine;

defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Uri\Uri;

class NotificationSender
{
	/**
	 * Send a backup notification email.
	 *
	 * @param   object  $profile   Profile object with notification settings
	 * @param   object  $record    Backup record object with results
	 * @param   bool    $success   Whether the backup succeeded
	 * @param   string  $logText   Backup log text
	 *
	 * @return  bool  True if email was sent
	 */
	public static function send(object $profile, object $record, bool $success, string $logText = ''): bool
	{
		$emailSent = self::sendEmail($profile, $record, $success, $logText);
		$ntfySent  = self::sendNtfy($profile, $record, $success);

		return $emailSent || $ntfySent;
	}

	private static function sendEmail(object $profile, object $record, bool $success, string $logText = ''): bool
	{
		$notifyEmail      = trim($profile->notify_email ?? '');
		$notifyUserGroups = $profile->notify_user_groups ?? '';

		// Resolve user group members to email addresses
		$groupEmails = self::resolveUserGroupEmails($notifyUserGroups);

		if (empty($notifyEmail) && empty($groupEmails)) {
			return false;
		}

		// Check notification preferences
		if ($success && empty($profile->notify_on_success)) {
			return false;
		}

		if (!$success && empty($profile->notify_on_failure)) {
			return false;
		}

		try {
			$mailer  = Factory::getMailer();
			$config  = Factory::getApplication()->getConfig();
			$siteName = $config->get('sitename', 'Joomla Site');
			$siteUrl  = Uri::root();

			// Parse recipient list (comma-separated) + user group emails
			$recipients = array_map('trim', explode(',', $notifyEmail));
			$recipients = array_merge($recipients, $groupEmails);
			$recipients = array_unique(array_filter($recipients, fn($e) => filter_var($e, FILTER_VALIDATE_EMAIL)));

			if (empty($recipients)) {
				return false;
			}

			foreach ($recipients as $recipient) {
				$mailer->addRecipient($recipient);
			}

			// Build subject
			$statusLabel = $success ? 'SUCCESS' : 'FAILED';
			$mailer->setSubject("[MokoSuiteBackup] {$statusLabel}: {$record->description} — {$siteName}");

			// Build body
			$duration = '';

			if (!empty($record->backupstart) && !empty($record->backupend)
				&& $record->backupend !== '0000-00-00 00:00:00') {
				$start    = strtotime($record->backupstart);
				$end      = strtotime($record->backupend);
				$seconds  = max(0, $end - $start);
				$duration = $seconds < 60
					? $seconds . ' seconds'
					: round($seconds / 60, 1) . ' minutes';
			}

			$sizeHuman = $record->total_size > 0
				? number_format($record->total_size / 1048576, 2) . ' MB'
				: 'N/A';

			$body = "MokoSuiteBackup Notification\n"
				. "============================\n\n"
				. "Site:        {$siteName}\n"
				. "URL:         {$siteUrl}\n"
				. "Status:      {$statusLabel}\n"
				. "Profile:     {$profile->title}\n"
				. "Description: {$record->description}\n"
				. "Type:        {$record->backup_type}\n"
				. "Origin:      {$record->origin}\n"
				. "Archive:     {$record->archivename}\n"
				. "Size:        {$sizeHuman}\n"
				. "Duration:    {$duration}\n"
				. "Started:     {$record->backupstart}\n"
				. "Ended:       {$record->backupend}\n";

			if (!empty($record->remote_filename)) {
				$body .= "Remote:      {$record->remote_filename}\n";
			}

			if ($record->files_count > 0 || $record->tables_count > 0) {
				$body .= "Files:       {$record->files_count}\n"
					. "Tables:      {$record->tables_count}\n";
			}

			// Add log excerpt on failure (last 30 lines)
			if (!$success && !empty($logText)) {
				$logLines = explode("\n", $logText);
				$excerpt  = array_slice($logLines, -30);
				$body .= "\n--- Log (last 30 lines) ---\n"
					. implode("\n", $excerpt) . "\n";
			}

			$body .= "\n--\n"
				. "MokoSuiteBackup — https://mokoconsulting.tech\n";

			$mailer->setBody($body);
			$mailer->isHtml(false);

			return $mailer->Send();
		} catch (\Throwable $e) {
			// Don't let notification failure break the backup flow
			error_log('MokoSuiteBackup notification error: ' . $e->getMessage());

			return false;
		}
	}

	/**
	 * Send a push notification via ntfy.
	 */
	private static function sendNtfy(object $profile, object $record, bool $success): bool
	{
		$topic  = trim($profile->ntfy_topic ?? '');
		$server = trim($profile->ntfy_server ?? 'https://ntfy.sh');
		$token  = trim($profile->ntfy_token ?? '');

		if ($topic === '') {
			return false;
		}

		// Respect the same success/failure preferences as email
		if ($success && empty($profile->notify_on_success)) {
			return false;
		}

		if (!$success && empty($profile->notify_on_failure)) {
			return false;
		}

		if (!function_exists('curl_init')) {
			error_log('MokoSuiteBackup: ntfy notifications require ext-curl');

			return false;
		}

		try {
			$config   = Factory::getApplication()->getConfig();
			$siteName = $config->get('sitename', 'Joomla Site');

			$statusLabel = $success ? 'SUCCESS' : 'FAILED';
			$statusEmoji = $success ? "\xE2\x9C\x85" : "\xE2\x9D\x8C";

			$sizeHuman = $record->total_size > 0
				? number_format($record->total_size / 1048576, 2) . ' MB'
				: 'N/A';

			$title = "{$statusEmoji} Backup {$statusLabel}: {$siteName}";
			$body  = "Profile: {$profile->title}\n"
				. "Type: {$record->backup_type}\n"
				. "Archive: {$record->archivename}\n"
				. "Size: {$sizeHuman}";

			$url = rtrim($server, '/') . '/' . rawurlencode($topic);

			$headers = [
				'Title: ' . $title,
				'Priority: ' . ($success ? '3' : '5'),
				'Tags: ' . ($success ? 'white_check_mark' : 'rotating_light'),
			];

			if ($token !== '') {
				$headers[] = 'Authorization: Bearer ' . $token;
			}

			$ch = curl_init($url);
			curl_setopt_array($ch, [
				CURLOPT_POST           => true,
				CURLOPT_POSTFIELDS     => $body,
				CURLOPT_HTTPHEADER     => $headers,
				CURLOPT_RETURNTRANSFER => true,
				CURLOPT_TIMEOUT        => 10,
				CURLOPT_CONNECTTIMEOUT => 5,
			]);

			$response = curl_exec($ch);
			$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
			$error    = curl_error($ch);
			curl_close($ch);

			if ($error !== '') {
				error_log('MokoSuiteBackup: ntfy error: ' . $error);
				return false;
			}

			if ($httpCode < 200 || $httpCode >= 300) {
				error_log('MokoSuiteBackup: ntfy returned HTTP ' . $httpCode . ': ' . substr((string) $response, 0, 200));
				return false;
			}

			return true;
		} catch (\Throwable $e) {
			error_log('MokoSuiteBackup: ntfy notification error: ' . $e->getMessage());
			return false;
		}
	}

	/**
	 * Send a restore/snapshot notification via email and ntfy.
	 *
	 * @param   object  $profile  Profile object with notification settings
	 * @param   string  $type     One of: site_restore, snapshot_create, snapshot_restore
	 * @param   array   $details  Context: record_id, content_types, row_count, mode, user, etc.
	 * @param   string  $log      Operation log text
	 *
	 * @return  bool  True if at least one notification was sent
	 */
	public static function sendRestoreNotification(object $profile, string $type, array $details, string $log = ''): bool
	{
		$emailSent = self::sendRestoreEmail($profile, $type, $details, $log);
		$ntfySent  = self::sendRestoreNtfy($profile, $type, $details);

		return $emailSent || $ntfySent;
	}

	/**
	 * Load the default profile (ID 1) for notification settings.
	 *
	 * @return  object|null  Profile object or null if not found
	 */
	public static function getDefaultProfile(): ?object
	{
		try {
			$db    = Factory::getDbo();
			$query = $db->getQuery(true)
				->select('*')
				->from($db->quoteName('#__mokosuitebackup_profiles'))
				->where($db->quoteName('id') . ' = 1');
			$db->setQuery($query);

			return $db->loadObject() ?: null;
		} catch (\Throwable $e) {
			error_log('MokoSuiteBackup: Cannot load default profile: ' . $e->getMessage());

			return null;
		}
	}

	/**
	 * Build subject and body for a restore/snapshot notification email.
	 */
	private static function buildRestoreMessage(string $type, array $details, string $siteName, string $siteUrl): array
	{
		$user = $details['user'] ?? 'Unknown';

		switch ($type) {
			case 'site_restore':
				$subject = "[MokoSuiteBackup] RESTORE: Site restored — {$siteName}";
				$options  = [];

				if (!empty($details['restore_files'])) {
					$options[] = 'Files';
				}

				if (!empty($details['restore_db'])) {
					$options[] = 'Database';
				}

				if (!empty($details['preserve_config'])) {
					$options[] = 'Config preserved';
				}

				$body = "MokoSuiteBackup — Site Restore Notification\n"
					. "=============================================\n\n"
					. "Site:        {$siteName}\n"
					. "URL:         {$siteUrl}\n"
					. "Action:      Full site restore\n"
					. "Record ID:   " . ($details['record_id'] ?? 'N/A') . "\n"
					. "Options:     " . (empty($options) ? 'N/A' : implode(', ', $options)) . "\n"
					. "Triggered by: {$user}\n";
				break;

			case 'snapshot_create':
				$types = $details['content_types'] ?? [];
				$typesStr = !empty($types) ? implode(', ', $types) : 'N/A';

				$subject = "[MokoSuiteBackup] SNAPSHOT: Content snapshot created — {$siteName}";
				$body = "MokoSuiteBackup — Snapshot Created\n"
					. "===================================\n\n"
					. "Site:           {$siteName}\n"
					. "URL:            {$siteUrl}\n"
					. "Action:         Snapshot created\n"
					. "Content types:  {$typesStr}\n"
					. "Articles:       " . ($details['articles_count'] ?? 0) . "\n"
					. "Categories:     " . ($details['categories_count'] ?? 0) . "\n"
					. "Modules:        " . ($details['modules_count'] ?? 0) . "\n"
					. "Triggered by:   {$user}\n";
				break;

			case 'snapshot_restore':
				$types = $details['content_types'] ?? [];
				$typesStr = !empty($types) ? implode(', ', $types) : 'N/A';

				$subject = "[MokoSuiteBackup] RESTORE: Snapshot restored — {$siteName}";
				$body = "MokoSuiteBackup — Snapshot Restore Notification\n"
					. "================================================\n\n"
					. "Site:           {$siteName}\n"
					. "URL:            {$siteUrl}\n"
					. "Action:         Snapshot restore\n"
					. "Mode:           " . ($details['mode'] ?? 'N/A') . "\n"
					. "Content types:  {$typesStr}\n"
					. "Rows restored:  " . ($details['row_count'] ?? 0) . "\n"
					. "Triggered by:   {$user}\n";
				break;

			default:
				$subject = "[MokoSuiteBackup] NOTIFICATION: {$type} — {$siteName}";
				$body = "MokoSuiteBackup Notification\n"
					. "============================\n\n"
					. "Site:    {$siteName}\n"
					. "URL:     {$siteUrl}\n"
					. "Type:    {$type}\n"
					. "Details: " . json_encode($details) . "\n";
				break;
		}

		$body .= "\n--\n"
			. "MokoSuiteBackup — https://mokoconsulting.tech\n";

		return ['subject' => $subject, 'body' => $body];
	}

	/**
	 * Send a restore/snapshot notification email.
	 */
	private static function sendRestoreEmail(object $profile, string $type, array $details, string $log = ''): bool
	{
		$notifyEmail      = trim($profile->notify_email ?? '');
		$notifyUserGroups = $profile->notify_user_groups ?? '';

		$groupEmails = self::resolveUserGroupEmails($notifyUserGroups);

		if (empty($notifyEmail) && empty($groupEmails)) {
			return false;
		}

		// Restore notifications are always "success" events — use notify_on_success preference
		if (empty($profile->notify_on_success)) {
			return false;
		}

		try {
			$mailer   = Factory::getMailer();
			$config   = Factory::getApplication()->getConfig();
			$siteName = $config->get('sitename', 'Joomla Site');
			$siteUrl  = Uri::root();

			$recipients = array_map('trim', explode(',', $notifyEmail));
			$recipients = array_merge($recipients, $groupEmails);
			$recipients = array_unique(array_filter($recipients, fn($e) => filter_var($e, FILTER_VALIDATE_EMAIL)));

			if (empty($recipients)) {
				return false;
			}

			foreach ($recipients as $recipient) {
				$mailer->addRecipient($recipient);
			}

			$message = self::buildRestoreMessage($type, $details, $siteName, $siteUrl);
			$mailer->setSubject($message['subject']);

			$body = $message['body'];

			// Append log excerpt if provided (last 30 lines)
			if (!empty($log)) {
				$logLines = explode("\n", $log);
				$excerpt  = array_slice($logLines, -30);
				$body .= "\n--- Log (last 30 lines) ---\n"
					. implode("\n", $excerpt) . "\n";
			}

			$mailer->setBody($body);
			$mailer->isHtml(false);

			return $mailer->Send();
		} catch (\Throwable $e) {
			error_log('MokoSuiteBackup restore notification error: ' . $e->getMessage());

			return false;
		}
	}

	/**
	 * Send a restore/snapshot push notification via ntfy.
	 */
	private static function sendRestoreNtfy(object $profile, string $type, array $details): bool
	{
		$topic  = trim($profile->ntfy_topic ?? '');
		$server = trim($profile->ntfy_server ?? 'https://ntfy.sh');
		$token  = trim($profile->ntfy_token ?? '');

		if ($topic === '') {
			return false;
		}

		// Restore notifications are always "success" events — use notify_on_success preference
		if (empty($profile->notify_on_success)) {
			return false;
		}

		if (!function_exists('curl_init')) {
			error_log('MokoSuiteBackup: ntfy notifications require ext-curl');

			return false;
		}

		try {
			$config   = Factory::getApplication()->getConfig();
			$siteName = $config->get('sitename', 'Joomla Site');

			switch ($type) {
				case 'site_restore':
					$emoji = "\xF0\x9F\x94\x84"; // 🔄
					$title = "{$emoji} Site Restored: {$siteName}";
					$body  = "Record ID: " . ($details['record_id'] ?? 'N/A') . "\n"
						. "Triggered by: " . ($details['user'] ?? 'Unknown');
					break;

				case 'snapshot_create':
					$emoji = "\xF0\x9F\x93\xB8"; // 📸
					$types = $details['content_types'] ?? [];
					$title = "{$emoji} Snapshot Created: {$siteName}";
					$body  = "Types: " . implode(', ', $types) . "\n"
						. "Articles: " . ($details['articles_count'] ?? 0) . "\n"
						. "Categories: " . ($details['categories_count'] ?? 0) . "\n"
						. "Modules: " . ($details['modules_count'] ?? 0);
					break;

				case 'snapshot_restore':
					$emoji = "\xF0\x9F\x94\x84"; // 🔄
					$types = $details['content_types'] ?? [];
					$title = "{$emoji} Snapshot Restored: {$siteName}";
					$body  = "Mode: " . ($details['mode'] ?? 'N/A') . "\n"
						. "Types: " . implode(', ', $types) . "\n"
						. "Rows: " . ($details['row_count'] ?? 0);
					break;

				default:
					$title = "MokoSuiteBackup: {$type} — {$siteName}";
					$body  = json_encode($details);
					break;
			}

			$url = rtrim($server, '/') . '/' . rawurlencode($topic);

			$headers = [
				'Title: ' . $title,
				'Priority: 3',
				'Tags: arrows_counterclockwise',
			];

			if ($token !== '') {
				$headers[] = 'Authorization: Bearer ' . $token;
			}

			$ch = curl_init($url);
			curl_setopt_array($ch, [
				CURLOPT_POST           => true,
				CURLOPT_POSTFIELDS     => $body,
				CURLOPT_HTTPHEADER     => $headers,
				CURLOPT_RETURNTRANSFER => true,
				CURLOPT_TIMEOUT        => 10,
				CURLOPT_CONNECTTIMEOUT => 5,
			]);

			$response = curl_exec($ch);
			$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
			$error    = curl_error($ch);
			curl_close($ch);

			if ($error !== '') {
				error_log('MokoSuiteBackup: ntfy error: ' . $error);
				return false;
			}

			if ($httpCode < 200 || $httpCode >= 300) {
				error_log('MokoSuiteBackup: ntfy returned HTTP ' . $httpCode . ': ' . substr((string) $response, 0, 200));
				return false;
			}

			return true;
		} catch (\Throwable $e) {
			error_log('MokoSuiteBackup: ntfy restore notification error: ' . $e->getMessage());
			return false;
		}
	}

	/**
	 * Resolve user group IDs to email addresses of group members.
	 *
	 * @param   string|array  $groups  Comma-separated group IDs or array
	 *
	 * @return  array  Email addresses
	 */
	private static function resolveUserGroupEmails(string|array $groups): array
	{
		if (empty($groups)) {
			return [];
		}

		if (\is_string($groups)) {
			$groups = array_filter(array_map('intval', explode(',', $groups)));
		}

		if (empty($groups)) {
			return [];
		}

		try {
			$db    = Factory::getDbo();
			$query = $db->getQuery(true)
				->select('DISTINCT ' . $db->quoteName('u.email'))
				->from($db->quoteName('#__users', 'u'))
				->join('INNER', $db->quoteName('#__user_usergroup_map', 'ugm') . ' ON ugm.user_id = u.id')
				->where($db->quoteName('u.block') . ' = 0')
				->whereIn($db->quoteName('ugm.group_id'), $groups);
			$db->setQuery($query);

			return $db->loadColumn() ?: [];
		} catch (\Throwable $e) {
			error_log('MokoSuiteBackup: Could not resolve user group emails: ' . $e->getMessage());

			return [];
		}
	}
}