From ea64da019ace78f26c979725bb187f48bd59f3cb Mon Sep 17 00:00:00 2001
From: Altaezio <v.robert.jaunet@gmail.com>
Date: Sun, 26 Jul 2026 20:43:07 +0200
Subject: [PATCH] tractor beam swap enable

---
 gui/pointer/scripts/pointer.gd | 46 +++++++++++++++++++++++++++++-----
 1 file changed, 40 insertions(+), 6 deletions(-)

diff --git a/gui/pointer/scripts/pointer.gd b/gui/pointer/scripts/pointer.gd
index c5d4ca1..23124a2 100644
--- a/gui/pointer/scripts/pointer.gd
+++ b/gui/pointer/scripts/pointer.gd
@@ -19,6 +19,7 @@ var all_inspected: Array[Node]
 var inspected: Node = null
 var inspected_card_info: CardInfo = null
 var inspected_inventory_slot: InventoryGuiItemMouseDetector = null
+var started_dragging_from_slot: InventoryGuiItemMouseDetector = null
 var player: Player # renseigné par Player
 var can_interact: bool = false
 var current_selected_item: Item = null
@@ -291,6 +292,7 @@ func start_dragging():
             if item_to_drop and item_to_drop.type != Item.ItemType.TOOL_ITEM:
                 GameInfo.game_data.player_data.inventory.remove_item_at(inspected.index)
                 var dropped_item_object := player.terrain.drop_item(item_to_drop, player.get_global_mouse_position())
+                started_dragging_from_slot = inspected
                 inspected_inventory_slot = inspected
                 inspected = dropped_item_object
                 player.region.save()
@@ -310,9 +312,41 @@ func stop_dragging():
         if inspected is ItemObject:
             inspected.object_sprite.tractor_beam.emitting = false
             if inspected_inventory_slot is InventoryGuiItemMouseDetector:
-                if GameInfo.game_data.player_data.inventory.add_item_at(inspected.item, inspected_inventory_slot.index):
-                    all_inspected.clear()
-                    inspected.queue_free()
-                    inspect(inspected_inventory_slot)
-                else:
-                    stop_inspect(inspected)
+                var item_in_inspected_slot := GameInfo.game_data.player_data.inventory.get_item(inspected_inventory_slot.index)
+                if item_in_inspected_slot: # there is an item in inspected slot
+                    if started_dragging_from_slot: # I started dragging from a slot
+                        if not GameInfo.game_data.player_data.inventory.get_item(started_dragging_from_slot.index): # starting slot is still available -> swap items
+                            var added_target_to_started_slot := GameInfo.game_data.player_data.inventory.add_item_at(item_in_inspected_slot, started_dragging_from_slot.index)
+                            GameInfo.game_data.player_data.inventory.remove_item_at(inspected_inventory_slot.index)
+                            var added_dragged_to_inspected_slot := GameInfo.game_data.player_data.inventory.add_item_at(inspected.item, inspected_inventory_slot.index)
+                            if not added_target_to_started_slot:
+                                printerr("Not able to add item from target slot to started slot")
+                            if not added_dragged_to_inspected_slot:
+                                printerr("Not able to add dragged item to target slot")
+                            all_inspected.clear()
+                            inspected.queue_free()
+                            inspect(inspected_inventory_slot)
+                            AudioManager.play_sfx("PickUp")
+                        else: # starting slot not available anymore
+                            printerr("Can an item be added while dragging?")
+                            stop_inspect(inspected)
+                    else: # I started dragging from the ground -> drop item in inspected slot and put inspected item
+                        GameInfo.game_data.player_data.inventory.remove_item_at(inspected_inventory_slot.index)
+                        var dropped_item_object := player.terrain.drop_item(item_in_inspected_slot, player.global_position)
+                        player.just_dropped_item_objects.append(dropped_item_object)
+                        AudioManager.play_sfx("Drop")
+                        var added_dragged_to_inspected_slot := GameInfo.game_data.player_data.inventory.add_item_at(inspected.item, inspected_inventory_slot.index)
+                        if not added_dragged_to_inspected_slot:
+                            printerr("Not able to add item to inspected slot")
+                        all_inspected.clear()
+                        inspected.queue_free()
+                        inspect(inspected_inventory_slot)
+                else: # no item in inspected slot -> put inspected item in it
+                    if GameInfo.game_data.player_data.inventory.add_item_at(inspected.item, inspected_inventory_slot.index):
+                        all_inspected.clear()
+                        inspected.queue_free()
+                        inspect(inspected_inventory_slot)
+                        AudioManager.play_sfx("PickUp")
+            else: # just leave where it is
+                player.just_dropped_item_objects.append(inspected)
+    started_dragging_from_slot = null