MAPG-140 add PersistentDataManager and refactor of models

src/PersistentData/Model/Model.php

@@ -0,0 +1,69 @@
+<?php namespace MapGuesser\PersistentData\Model;
+
+abstract class Model
+{
+    protected static string $table;
+
+    protected static array $fields;
+
+    protected static array $relations = [];
+
+    protected $id = null;
+
+    private array $snapshot = [];
+
+    public static function getTable(): string
+    {
+        return static::$table;
+    }
+
+    public static function getFields(): array
+    {
+        return array_merge(['id'], static::$fields);
+    }
+
+    public static function getRelations(): array
+    {
+        return static::$relations;
+    }
+
+    public function setId($id): void
+    {
+        $this->id = $id;
+    }
+
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    public function toArray(): array
+    {
+        $array = [];
+
+        foreach (self::getFields() as $key) {
+            $method = 'get' . str_replace('_', '', ucwords($key, '_'));
+
+            if (method_exists($this, $method)) {
+                $array[$key] = $this->$method();
+            }
+        }
+
+        return $array;
+    }
+
+    public function saveSnapshot(): void
+    {
+        $this->snapshot = $this->toArray();
+    }
+
+    public function resetSnapshot(): void
+    {
+        $this->snapshot = [];
+    }
+
+    public function getSnapshot(): array
+    {
+        return $this->snapshot;
+    }
+}