Change how map loading works

scenes/main_menu.tscn

@@ -7,9 +7,45 @@
 resource_name = "StartButton"
 script/source = "extends Button
 
+const COMBAT_SCENE = preload(\"res://scenes/combat_test.tscn\")
+const UNIT_SCENE = preload(\"res://prefabs/unit.tscn\")
+const PLAYER_ALLEGIANCE = preload(\"res://resources/allegiance_types/player_allegiance.tres\")
+const ENEMY_ALLEGIANCE = preload(\"res://resources/allegiance_types/enemy_allegiance.tres\")
+
+const MAP_LAYOUT := \"\"\"\\
+#####
+#...#
+#...#
+#...#
+#####\"\"\"
+
 func _pressed() -> void:
-	get_parent().queue_free()
-	get_tree().change_scene_to_file(\"res://scenes/combat_test.tscn\")
+	var combat_instance := COMBAT_SCENE.instantiate()
+	var combat_map: CombatMap = combat_instance.find_child(\"CombatMap\")
+
+	combat_map.load_map(MAP_LAYOUT)
+
+	var player_unit: Unit = UNIT_SCENE.instantiate()
+	player_unit.stat_template = UnitStats.new(50)
+	player_unit.info_template = UnitInfo.new()
+	player_unit.info_template.name = \"Putit\"
+	player_unit.allegiance_template = PLAYER_ALLEGIANCE
+	combat_map.deploy_unit(player_unit, Vector2i(2, 2))
+
+	var enemy_unit: Unit = UNIT_SCENE.instantiate()
+	enemy_unit.stat_template = UnitStats.new(50)
+	enemy_unit.info_template = UnitInfo.new()
+	enemy_unit.info_template.name = \"Putit\"
+	enemy_unit.allegiance_template = ENEMY_ALLEGIANCE
+	combat_map.deploy_unit(enemy_unit, Vector2i(2, 1))
+
+	var tree := get_tree()
+	var root := tree.root
+	var current_scene := tree.current_scene
+	root.remove_child(current_scene)
+	current_scene.queue_free()
+	root.add_child(combat_instance)
+	tree.current_scene = combat_instance
 "
 
 [sub_resource type="GDScript" id="GDScript_ekxnf"]