<?php

/**
 * ---------------------------------------------------------------------
 *
 * GLPI - Gestionnaire Libre de Parc Informatique
 *
 * http://glpi-project.org
 *
 * @copyright 2015-2024 Teclib' and contributors.
 * @copyright 2003-2014 by the INDEPNET Development Team.
 * @licence   https://www.gnu.org/licenses/gpl-3.0.html
 *
 * ---------------------------------------------------------------------
 *
 * LICENSE
 *
 * This file is part of GLPI.
 *
 * 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.
 *
 * 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, see <https://www.gnu.org/licenses/>.
 *
 * ---------------------------------------------------------------------
 */

use Glpi\Http\Response;

const DELTA_ACTION_ADD    = 1;
const DELTA_ACTION_UPDATE = 2;
const DELTA_ACTION_DELETE = 3;

$AJAX_INCLUDE = 1;
include('../inc/includes.php');

// Send UTF8 Headers
header("Content-Type: application/json; charset=UTF-8");
Html::header_nocache();

Session::checkLoginUser();

switch ($_SERVER['REQUEST_METHOD']) {
   // GET request: build the impact graph for a given asset
    case 'GET':
        $action = $_GET["action"]  ?? "";

        switch ($action) {
            case "search":
                $itemtype = $_GET["itemtype"] ?? "";
                $used     = $_GET["used"]     ?? "[]";
                $filter   = $_GET["filter"]   ?? "";
                $page     = $_GET["page"]     ?? 0;

                // Check required params
                if (empty($itemtype)) {
                    Response::sendError(400, "Missing itemtype");
                }

                // Execute search
                $assets = Impact::searchAsset($itemtype, json_decode($used), $filter, $page);
                header('Content-Type: application/json');
                echo json_encode($assets);
                break;

            case 'load':
                $itemtype = $_GET["itemtype"]  ?? "";
                $items_id = $_GET["items_id"]  ?? "";
                $view     = $_GET["view"]      ?? "graph";

               // Check required params
                if (empty($itemtype) || empty($items_id)) {
                    Response::sendError(400, "Missing itemtype or items_id");
                }

               // Check that the the target asset exist
                if (!Impact::assetExist($itemtype, $items_id)) {
                    Response::sendError(400, "Object[class=$itemtype, id=$items_id] doesn't exist");
                }

               // Prepare graph
                $item = new $itemtype();
                $item->getFromDB($items_id);
                $graph = Impact::buildGraph($item);
                $params = Impact::prepareParams($item);
                $readonly = $item->can($items_id, UPDATE);

                if ($view == "graph") {
                   // Output graph as json
                    header('Content-Type: application/json');
                    echo json_encode([
                        'graph'  => Impact::makeDataForCytoscape($graph),
                        'params' => $params,
                        'readonly' => $readonly,
                    ]);
                } else if ($view == "list") {
                   // Output list as HTML
                    header('Content-Type: text/html');
                    Impact::displayListView($item, $graph);
                }
                break;

            default:
                Response::sendError(400, "Missing or invalid 'action' parameter");
                break;
        }
        break;

   // Post request: update the store impact dependencies, compounds or items
    case 'POST':
       // Check required params
        if (!isset($_POST['impacts'])) {
            Response::sendError(400, "Missing 'impacts' payload");
        }

       // Decode data (should be json)
        $data = Toolbox::jsonDecode($_POST['impacts'], true);
        if (!is_array($data)) {
            Response::sendError(400, "Payload should be an array");
        }
        $data = Toolbox::addslashes_deep($data);

        $readonly = true;

       // Handle context for the starting node
        $context_em = new \ImpactContext();
        $context_data = $data['context'];

       // Get id and type from node_id (e.g. Computer::4 -> [Computer, 4])
        $start_node_details = explode(Impact::NODE_ID_DELIMITER, $context_data['node_id']);

       // Get impact_item for this node
        $item = new $start_node_details[0]();
        $item->getFromDB($start_node_details[1]);
        $impact_item = \ImpactItem::findForItem($item);
        $start_node_impact_item_id = $impact_item->fields['id'];
        $readonly = !$item->can($item->fields['id'], UPDATE);

       // Stop here if readonly graph
        if ($readonly) {
            Response::sendError(403, "Missing rights");
        }

        $context_id = 0;
        if (
            $impact_item->fields["impactcontexts_id"] == 0
            || $impact_item->fields["is_slave"] == 1
        ) {
           // There is no context OR we are slave to another context -> let's
           // create a new one
            $context_id = $context_em->add($context_data);

           // Set the context_id to be updated
            $data['items'][$start_node_impact_item_id]['impactcontexts_id'] = $context_id;
            $data['items'][$start_node_impact_item_id]['is_slave'] = 0;
        } else {
           // Update existing context
            $context_id = $impact_item->fields["impactcontexts_id"];
            $context_em->getFromDB($context_id);
            $context_data['id'] = $context_id;
            $context_em->update($context_data);
        }

       // Save impact relation delta
        $em = new ImpactRelation();
        foreach ($data['edges'] as $impact) {
           // Extract action
            $action = $impact['action'];
            unset($impact['action']);

            switch ($action) {
                case DELTA_ACTION_ADD:
                    $em->add($impact);
                    break;

                case DELTA_ACTION_DELETE:
                    $impact['id'] = ImpactRelation::getIDFromInput($impact);
                    $em->delete($impact);
                    break;

                default:
                    break;
            }
        }

       // Save impact compound delta
        $em = new ImpactCompound();
        foreach ($data['compounds'] as $id => $compound) {
           // Extract action
            $action = $compound['action'];
            unset($compound['action']);

            switch ($action) {
                case DELTA_ACTION_ADD:
                    $newCompoundID = $em->add($compound);

                    // Update id reference in impactitem
                    // This is needed because some nodes might have this compound
                    // temporary id as their parent id
                    foreach ($data['items'] as $nodeID => $node) {
                        if ($node['parent_id'] === $id) {
                             $data['items'][$nodeID]['parent_id'] = $newCompoundID;
                        }
                    }
                    break;

                case DELTA_ACTION_UPDATE:
                    $compound['id'] = $id;
                    $em->update($compound);
                    break;

                case DELTA_ACTION_DELETE:
                    $em->delete(['id' => $id]);
                    break;

                default:
                    break;
            }
        }

       // Save impact item delta
        $em = new ImpactItem();
        foreach ($data['items'] as $id => $impactItem) {
           // Extract action
            $action = $impactItem['action'];
            unset($impactItem['action']);

            switch ($action) {
                case DELTA_ACTION_UPDATE:
                    $impactItem['id'] = $id;

                    // If this is not the starting node, check for context update
                    if ($id !== $start_node_impact_item_id) {
                        $em->getFromDB($id);

                      // If this node has no context -> make it a slave
                        if ($em->fields['impactcontexts_id'] == 0) {
                             $impactItem['impactcontexts_id'] = $context_id;
                             $impactItem['is_slave'] = 1;
                        }
                    }

                    $em->update($impactItem);
                    break;
            }
        }

        header('Content-Type: application/javascript');
        http_response_code(200);
        break;
}
