Add equipment unequip flow

scripts/core/battle_state.gd

@@ -1681,7 +1681,7 @@ func try_equip_item(unit_id: String, item_id: String) -> bool:
 		return false
 
 	var equipment: Dictionary = unit.get("equipment", {}).duplicate(true)
-	var old_item_id := str(equipment.get(slot, ""))
+	var old_item_id := _equipment_item_id_for_slot(equipment, slot)
 	if old_item_id == item_id:
 		_emit_log("%s already has %s equipped." % [unit["name"], item.get("name", item_id)])
 		return false
@@ -1700,6 +1700,43 @@ func try_equip_item(unit_id: String, item_id: String) -> bool:
 	return true
 
 
+func try_unequip_item(unit_id: String, slot: String) -> bool:
+	var unit := get_unit(unit_id)
+	if unit.is_empty() or battle_status != STATUS_ACTIVE:
+		return false
+	if unit.get("team", "") != TEAM_PLAYER or current_team != TEAM_PLAYER:
+		return false
+	if not bool(unit.get("controllable", true)):
+		return false
+	if unit.get("moved", false) or unit.get("acted", false):
+		_emit_log("%s can change equipment before moving or acting." % unit["name"])
+		return false
+
+	var normalized_slot := _normalized_equipment_slot(slot)
+	if normalized_slot.is_empty():
+		return false
+
+	var equipment: Dictionary = unit.get("equipment", {}).duplicate(true)
+	var old_item_id := _equipment_item_id_for_slot(equipment, normalized_slot)
+	if old_item_id.is_empty():
+		_emit_log("%s has no %s equipped." % [unit["name"], normalized_slot])
+		return false
+
+	var old_item := get_item_def(old_item_id)
+	if old_item.is_empty():
+		push_error("Cannot unequip unknown item %s from %s." % [old_item_id, unit["name"]])
+		return false
+
+	equipment.erase(normalized_slot)
+	unit["equipment"] = equipment
+	_apply_equipment_stat_delta(unit, old_item, {})
+	_refresh_attack_range_from_equipment(unit)
+	battle_inventory[old_item_id] = int(battle_inventory.get(old_item_id, 0)) + 1
+	_emit_log("%s unequips %s." % [unit["name"], old_item.get("name", old_item_id)])
+	_notify_changed()
+	return true
+
+
 func get_equippable_item_ids(unit_id: String) -> Array:
 	var result := []
 	var unit := get_unit(unit_id)
@@ -1718,7 +1755,7 @@ func get_equippable_item_ids(unit_id: String) -> Array:
 		if item.is_empty() or _equipment_slot_for_item(item).is_empty():
 			continue
 		var slot := _equipment_slot_for_item(item)
-		if str(equipment.get(slot, "")) == normalized:
+		if _equipment_item_id_for_slot(equipment, slot) == normalized:
 			continue
 		if not _unit_can_equip_item(unit, item):
 			continue
@@ -1727,6 +1764,24 @@ func get_equippable_item_ids(unit_id: String) -> Array:
 	return result
 
 
+func get_equipped_equipment_slots(unit_id: String) -> Array:
+	var result := []
+	var unit := get_unit(unit_id)
+	if unit.is_empty() or unit.get("team", "") != TEAM_PLAYER:
+		return result
+	if not bool(unit.get("controllable", true)):
+		return result
+	var equipment: Dictionary = unit.get("equipment", {})
+	for slot in ["weapon", "armor", "accessory"]:
+		var item_id := _equipment_item_id_for_slot(equipment, slot)
+		if item_id.is_empty():
+			continue
+		if get_item_def(item_id).is_empty():
+			continue
+		result.append(slot)
+	return result
+
+
 func get_equipment_snapshot(unit_id: String) -> Dictionary:
 	var unit := get_unit(unit_id)
 	if unit.is_empty():
@@ -2420,6 +2475,20 @@ func _equipment_slot_for_item(item: Dictionary) -> String:
 	return ""
 
 
+func _normalized_equipment_slot(slot: String) -> String:
+	var normalized := slot.strip_edges().to_lower()
+	if normalized == "weapon" or normalized == "armor" or normalized == "accessory":
+		return normalized
+	return ""
+
+
+func _equipment_item_id_for_slot(equipment: Dictionary, slot: String) -> String:
+	var item_id = equipment.get(slot, "")
+	if item_id == null:
+		return ""
+	return str(item_id)
+
+
 func _unit_can_equip_item(unit: Dictionary, item: Dictionary) -> bool:
 	var slot := _equipment_slot_for_item(item)
 	if slot.is_empty():