<?php
/**
 * @package     MokoSuiteClient
 * @subpackage  com_mokosuiteclient
 * @copyright   Copyright (C) 2026 Moko Consulting. All rights reserved.
 * @license     GNU General Public License version 3 or later; see LICENSE
 */

namespace Moko\Component\MokoSuiteClient\Administrator\Service;

defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Log\Log;

/**
 * Automation rule engine — evaluates trigger/condition/action rules.
 *
 * Called from event hooks (system plugin, task plugin) whenever
 * a triggering event occurs. Loads matching rules, checks conditions,
 * and executes actions.
 *
 * @since  02.35.00
 */
class AutomationEngine
{
	/**
	 * Fire all matching rules for a given trigger event.
	 *
	 * @param  string  $triggerEvent  Event name (ticket_created, user_login, etc.)
	 * @param  array   $context       Context data (ticket object, user data, etc.)
	 */
	public static function fire(string $triggerEvent, array $context = []): void
	{
		try
		{
			$rules = self::getActiveRules($triggerEvent);

			foreach ($rules as $rule)
			{
				$conditions = json_decode($rule->conditions, true) ?: [];
				$actions    = json_decode($rule->actions, true) ?: [];

				if (self::evaluateConditions($conditions, $context))
				{
					self::executeActions($actions, $rule, $context);
				}
			}
		}
		catch (\Throwable $e)
		{
			Log::add('Automation engine error: ' . $e->getMessage(), Log::ERROR, 'mokosuiteclient');
		}
	}

	/**
	 * Get active automation rules for a trigger event.
	 */
	private static function getActiveRules(string $event): array
	{
		$db = Factory::getDbo();
		$db->setQuery(
			$db->getQuery(true)
				->select('*')
				->from('#__mokosuiteclient_ticket_automation')
				->where($db->quoteName('trigger_event') . ' = ' . $db->quote($event))
				->where($db->quoteName('enabled') . ' = 1')
				->order('ordering ASC')
		);
		return $db->loadObjectList() ?: [];
	}

	/**
	 * Evaluate all conditions (AND logic).
	 */
	private static function evaluateConditions(array $conditions, array $context): bool
	{
		foreach ($conditions as $c)
		{
			$field = $c['field'] ?? '';
			$op    = $c['op'] ?? 'eq';
			$expected = $c['value'] ?? '';
			$actual = $context[$field] ?? '';

			switch ($op)
			{
				case 'eq':     if ((string) $actual !== (string) $expected) return false; break;
				case 'neq':    if ((string) $actual === (string) $expected) return false; break;
				case 'gt':     if ((float) $actual <= (float) $expected) return false; break;
				case 'lt':     if ((float) $actual >= (float) $expected) return false; break;
				case 'in':
					$values = array_map('trim', explode(',', $expected));
					if (!in_array((string) $actual, $values, true)) return false;
					break;
				case 'not_in':
					$values = array_map('trim', explode(',', $expected));
					if (in_array((string) $actual, $values, true)) return false;
					break;
			}
		}
		return true;
	}

	/**
	 * Execute actions for a matched rule.
	 */
	private static function executeActions(array $actions, object $rule, array $context): void
	{
		$db = Factory::getDbo();
		$ticketId = (int) ($context['ticket_id'] ?? $context['id'] ?? 0);

		foreach ($actions as $action)
		{
			$type  = $action['type'] ?? '';
			$value = $action['value'] ?? '';

			try
			{
				switch ($type)
				{
					case 'set_status':
						if ($ticketId) {
							$db->setQuery("UPDATE {$db->quoteName('#__mokosuiteclient_tickets')} SET status = {$db->quote($value)}, modified = {$db->quote(Factory::getDate()->toSql())} WHERE id = {$ticketId}")->execute();
						}
						break;

					case 'set_priority':
						if ($ticketId) {
							$db->setQuery("UPDATE {$db->quoteName('#__mokosuiteclient_tickets')} SET priority = {$db->quote($value)}, modified = {$db->quote(Factory::getDate()->toSql())} WHERE id = {$ticketId}")->execute();
						}
						break;

					case 'assign':
						if ($ticketId) {
							$db->setQuery("UPDATE {$db->quoteName('#__mokosuiteclient_tickets')} SET assigned_to = {$db->quote($value)}, modified = {$db->quote(Factory::getDate()->toSql())} WHERE id = {$ticketId}")->execute();
						}
						break;

					case 'add_note':
						if ($ticketId) {
							$note = (object) [
								'ticket_id' => $ticketId,
								'user_id'   => 0,
								'body'      => $value ?: '[Automation: ' . ($rule->title ?? '') . ']',
								'is_internal' => 1,
								'created'   => Factory::getDate()->toSql(),
							];
							$db->insertObject('#__mokosuiteclient_ticket_replies', $note);
						}
						break;

					case 'send_email':
						NotificationService::securityAlert(
							'automation',
							'Automation: ' . ($rule->title ?? ''),
							$value ?: 'Rule triggered for ticket #' . $ticketId
						);
						break;

					case 'send_ntfy':
						NotificationService::pushNtfySecurity(
							'automation',
							'Automation: ' . ($rule->title ?? ''),
							$value ?: 'Rule triggered for ticket #' . $ticketId
						);
						break;

					case 'close':
						if ($ticketId) {
							$db->setQuery("UPDATE {$db->quoteName('#__mokosuiteclient_tickets')} SET status = 'closed', closed = {$db->quote(Factory::getDate()->toSql())}, modified = {$db->quote(Factory::getDate()->toSql())} WHERE id = {$ticketId}")->execute();
						}
						break;

					case 'create_ticket':
						self::createTicketFromAutomation($rule, $context, $value);
						break;
				}
			}
			catch (\Throwable $e)
			{
				Log::add("Automation action {$type} failed: " . $e->getMessage(), Log::WARNING, 'mokosuiteclient');
			}
		}
	}

	/**
	 * Create a ticket from automation (with behavior: append/always_new/skip_if_open).
	 */
	private static function createTicketFromAutomation(object $rule, array $context, string $subject): void
	{
		$db       = Factory::getDbo();
		$behavior = $rule->behavior ?? 'append';
		$userId   = (int) ($context['user_id'] ?? 0);
		$catId    = (int) ($context['category_id'] ?? 0);

		if ($behavior !== 'always_new' && $userId > 0)
		{
			// Check for existing open ticket
			$query = $db->getQuery(true)
				->select('id')
				->from('#__mokosuiteclient_tickets')
				->where('created_by = ' . $userId)
				->where("status NOT IN ('closed', 'resolved')");

			if ($catId > 0) {
				$query->where('category_id = ' . $catId);
			}

			$db->setQuery($query, 0, 1);
			$existingId = (int) $db->loadResult();

			if ($existingId > 0)
			{
				if ($behavior === 'skip_if_open') return;

				// append — add reply to existing ticket
				$reply = (object) [
					'ticket_id'   => $existingId,
					'user_id'     => 0,
					'body'        => $subject ?: '[Automation: ' . ($rule->title ?? '') . ']',
					'is_internal' => 1,
					'created'     => Factory::getDate()->toSql(),
				];
				$db->insertObject('#__mokosuiteclient_ticket_replies', $reply);
				return;
			}
		}

		// Create new ticket
		$ticket = (object) [
			'subject'     => $subject ?: 'Automation: ' . ($rule->title ?? ''),
			'body'        => $context['body'] ?? '',
			'status'      => 'open',
			'priority'    => $context['priority'] ?? 'normal',
			'category_id' => $catId ?: null,
			'created_by'  => $userId,
			'created'     => Factory::getDate()->toSql(),
		];
		$db->insertObject('#__mokosuiteclient_tickets', $ticket, 'id');
	}
}