Refactor and add importer to Installer module #443 (#444)

* Refactor and add importer to Installer module #443

* Refactor for finances to use in import

* Import groups into roles

* Formatting

* Formatting

* Add interface in installer for import

* Notes about importing

* Check for installer folder

* Formatting

* Fix pirep->user mapping

* Unused import

* Formatting

modules/Installer/Utils/IdMapper.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Modules\Installer\Utils;
+
+use App\Contracts\Service;
+use Spatie\Valuestore\Valuestore;
+
+class IdMapper extends Service
+{
+    private $valueStore;
+
+    public function __construct()
+    {
+        $this->valueStore = Valuestore::make(storage_path('app/legacy_migration.json'));
+    }
+
+    /**
+     * Create a new mapping between an old ID and the new one
+     *
+     * @param string $entity Name of the entity (e,g table)
+     * @param string $old_id
+     * @param string $new_id
+     */
+    public function addMapping($entity, $old_id, $new_id)
+    {
+        $key_name = $entity.'_'.$old_id;
+        if (!$this->valueStore->has($key_name)) {
+            $this->valueStore->put($key_name, $new_id);
+        }
+    }
+
+    /**
+     * Return the ID for a mapping
+     *
+     * @param $entity
+     * @param $old_id
+     *
+     * @return bool
+     */
+    public function getMapping($entity, $old_id)
+    {
+        $key_name = $entity.'_'.$old_id;
+        if (!$this->valueStore->has($key_name)) {
+            return 0;
+        }
+
+        return $this->valueStore->get($key_name);
+    }
+}