<?php declare(strict_types = 0);
/*
** Zabbix
** Copyright (C) 2001-2023 Zabbix SIA
**
** 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 2 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, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
**/


namespace Widgets\ProblemHosts\Actions;

use API,
	CArrayHelper,
	CControllerDashboardWidgetView,
	CControllerResponseData,
	CRoleHelper;

class WidgetView extends CControllerDashboardWidgetView {

	protected function init(): void {
		parent::init();

		$this->addValidationRules([
			'dynamic_hostid' => 'db hosts.hostid'
		]);
	}

	protected function doAction(): void {
		$data = [
			'name' => $this->getInput('name', $this->widget->getDefaultName()),
			'error' => null,
			'user' => [
				'debug_mode' => $this->getDebugMode()
			],
			'allowed_ui_problems' => $this->checkAccess(CRoleHelper::UI_MONITORING_PROBLEMS)
		];

		// Editing template dashboard?
		if ($this->isTemplateDashboard() && !$this->hasInput('dynamic_hostid')) {
			$data['error'] = _('No data.');
		}
		else {
			$filter_groupids = !$this->isTemplateDashboard() && $this->fields_values['groupids']
				? getSubGroups($this->fields_values['groupids'])
				: null;

			if ($this->isTemplateDashboard()) {
				$filter_hostids = [$this->getInput('dynamic_hostid')];
			}
			else {
				$filter_hostids = $this->fields_values['hostids'] ?: null;
			}

			$filter_problem = $this->fields_values['problem'] !== '' ? $this->fields_values['problem'] : null;
			$filter_severities = $this->fields_values['severities'] ?: range(TRIGGER_SEVERITY_NOT_CLASSIFIED,
				TRIGGER_SEVERITY_COUNT - 1
			);
			$filter_show_suppressed = $this->fields_values['show_suppressed'];
			$filter_ext_ack = $this->fields_values['ext_ack'];

			if (!$this->isTemplateDashboard() && $this->fields_values['exclude_groupids']) {
				$exclude_groupids = getSubGroups($this->fields_values['exclude_groupids']);

				if ($filter_hostids === null) {
					// Get all groups if no selected groups defined.
					if ($filter_groupids === null) {
						$filter_groupids = array_keys(API::HostGroup()->get([
							'output' => [],
							'with_hosts' => true,
							'preservekeys' => true
						]));
					}

					$filter_groupids = array_diff($filter_groupids, $exclude_groupids);

					// Get available hosts.
					$filter_hostids = array_keys(API::Host()->get([
						'output' => [],
						'groupids' => $filter_groupids,
						'preservekeys' => true
					]));
				}

				$exclude_hostids = array_keys(API::Host()->get([
					'output' => [],
					'groupids' => $exclude_groupids,
					'preservekeys' => true
				]));

				$filter_hostids = array_diff($filter_hostids, $exclude_hostids);
			}

			// Get host groups.
			$groups = API::HostGroup()->get([
				'output' => ['groupid', 'name'],
				'groupids' => $filter_groupids,
				'hostids' => $filter_hostids,
				'with_monitored_hosts' => true,
				'preservekeys' => true
			]);

			foreach ($groups as $groupid => $group) {
				$groups[$groupid]['highest_severity'] = TRIGGER_SEVERITY_NOT_CLASSIFIED;
				$groups[$groupid]['hosts_total_count'] = 0;
				$groups[$groupid]['hosts_problematic_unack_count'] = 0;
				$groups[$groupid]['hosts_problematic_unack_list'] = [];

				if ($filter_ext_ack != EXTACK_OPTION_UNACK) {
					$groups[$groupid]['hosts_problematic_count'] = 0;
					$groups[$groupid]['hosts_problematic_list'] = [];
				}
			}

			// Get hosts.
			$hosts = API::Host()->get([
				'output' => ['hostid', 'name', 'maintenanceid', 'maintenance_status', 'maintenance_type'],
				'selectHostGroups' => ['groupid'],
				'groupids' => array_keys($groups),
				'hostids' => $filter_hostids,
				'filter' => [
					'maintenance_status' => null
				],
				'monitored_hosts' => true,
				'preservekeys' => true
			]);

			// Get triggers.
			$triggers = API::Trigger()->get([
				'output' => [],
				'selectHosts' => ['hostid'],
				'hostids' => array_keys($hosts),
				'groupids' => array_keys($groups),
				'filter' => [
					'value' => TRIGGER_VALUE_TRUE
				],
				'monitored' => true,
				'preservekeys' => true
			]);

			// Add default values for each host group and count hosts inside.
			foreach ($hosts as $host) {
				foreach ($host['hostgroups'] as $group) {
					if (array_key_exists($group['groupid'], $groups)) {
						$groups[$group['groupid']]['hosts_total_count']++;
					}
				}
			}

			// Get problems.
			$problems = API::Problem()->get([
				'output' => ['objectid', 'acknowledged', 'severity'],
				'groupids' => array_keys($groups),
				'hostids' => array_keys($hosts),
				'objectids' => array_keys($triggers),
				'search' => [
					'name' => $filter_problem
				],
				'severities' => $filter_severities,
				'evaltype' => $this->fields_values['evaltype'],
				'tags' => $this->fields_values['tags'],
				'acknowledged' => ($filter_ext_ack == EXTACK_OPTION_UNACK) ? false : null,
				'suppressed' => ($filter_show_suppressed == ZBX_PROBLEM_SUPPRESSED_FALSE) ? false : null,
				'symptom' => false
			]);

			$hosts_data = [];

			// Process problems.
			foreach ($problems as $problem) {
				foreach ($triggers[$problem['objectid']]['hosts'] as $trigger_host) {
					if (!array_key_exists($trigger_host['hostid'], $hosts)) {
						continue;
					}

					$host = $hosts[$trigger_host['hostid']];

					// Prepare hosts data for tables displayed in hintboxes.
					if (!array_key_exists($host['hostid'], $hosts_data)) {
						$hosts_data[$host['hostid']] = [
							'host' => $host['name'],
							'hostid' => $host['hostid'],
							'maintenanceid' => $host['maintenanceid'],
							'maintenance_status' => $host['maintenance_status'],
							'maintenance_type' => $host['maintenance_type'],
							'severities' => array_fill_keys($filter_severities, 0)
						];
					}

					// Count number of host problems per severity.
					$hosts_data[$host['hostid']]['severities'][$problem['severity']]++;

					// Propagate problem to all host groups in which host is added.
					foreach ($host['hostgroups'] as $group) {
						$groupid = $group['groupid'];

						if (!array_key_exists($groupid, $groups)) {
							continue;
						}

						// Searches for the highest severity set for filtered problems in particular host group.
						if ($problem['severity'] > $groups[$groupid]['highest_severity']) {
							$groups[$groupid]['highest_severity'] = $problem['severity'];
						}

						/**
						 * Counts:
						 *  - problematic hosts (hosts with events in 'problem' state);
						 *  - unacknowledged problematic hosts (hosts with unacknowledged events in 'problem' state).
						 *
						 * Creates a list of problematic hosts and unacknowledged problematic hosts for each host group.
						 *
						 * Each host need to be counted only one time in each host group.
						 * Host name is added for sorting.
						 */
						if ($filter_ext_ack != EXTACK_OPTION_UNACK
							&& !array_key_exists($host['hostid'], $groups[$groupid]['hosts_problematic_list'])) {
							$groups[$groupid]['hosts_problematic_list'][$host['hostid']]['name'] = $host['name'];
							$groups[$groupid]['hosts_problematic_count']++;
						}

						if ($problem['acknowledged'] == EVENT_NOT_ACKNOWLEDGED
							&& !array_key_exists($host['hostid'], $groups[$groupid]['hosts_problematic_unack_list'])) {
							$groups[$groupid]['hosts_problematic_unack_list'][$host['hostid']]['name'] = $host['name'];
							$groups[$groupid]['hosts_problematic_unack_count']++;
						}
					}
				}
			}

			// Sort results.
			foreach ($groups as $groupid => $group) {
				if ($group['hosts_total_count'] != 0) {
					CArrayHelper::sort($groups[$groupid]['hosts_problematic_unack_list'], ['name']);

					if ($filter_ext_ack != EXTACK_OPTION_UNACK) {
						CArrayHelper::sort($groups[$groupid]['hosts_problematic_list'], ['name']);
					}
				}
				else {
					// Unset groups without any monitored hosts.
					unset($groups[$groupid]);
				}
			}

			CArrayHelper::sort($groups, ['name']);

			$data += [
				'filter' => [
					'hostids' => $this->isTemplateDashboard()
						? [$this->getInput('dynamic_hostid')]
						: $this->fields_values['hostids'],
					'problem' => $this->fields_values['problem'],
					'severities' => $filter_severities,
					'show_suppressed' => $this->fields_values['show_suppressed'],
					'hide_empty_groups' => !$this->isTemplateDashboard()
						? $this->fields_values['hide_empty_groups']
						: null,
					'ext_ack' => $this->fields_values['ext_ack']
				],
				'hosts_data' => $hosts_data,
				'groups' => $groups
			];
		}

		// Pass results to view.
		$this->setResponse(new CControllerResponseData($data));
	}
}