added winning determination algorithm (not entirely working yet)

cards/card_manager.gd

@@ -33,7 +33,51 @@ func get_card_texture(card_id: int, style: CardStyle = CardStyle.STICKMAN) -> Te
 		CardStyle.STICKMAN:
 			style_name = "stickman"
 	return load("res://cards/textures/" + style_name + "/" + _get_card_name(card_id) + ".webp")
-	
+
+func get_winning_card(card_ids: Array[int], trump: int) -> int:
+	if card_ids.has(56) or card_ids.has(57) or card_ids.has(58) or card_ids.has(59):
+		# cards contain magician
+		for card_id in card_ids:
+			if full_deck[card_id].card_type == Card.CardType.MAGICIAN:
+				return card_id
+		return -1 # should not happen
+	elif not trump == -1:
+		# trump exists, determine winner from this
+		var largest_trump_card_id: int = -1
+		var trump_color: Card.CardColor = full_deck[trump].color
+		for card_id in card_ids:
+			if full_deck[card_id].color == trump_color and card_id > largest_trump_card_id:
+				largest_trump_card_id = card_id
+		if not largest_trump_card_id == -1:
+			return largest_trump_card_id
+		
+		# no trump played; determine from highest played card
+		# TODO check for white cards here!
+		return _get_largest_non_trump_card(card_ids)
+	else:
+		# no trump exists
+		return _get_largest_non_trump_card(card_ids)
+
+func _get_largest_non_trump_card(card_ids: Array[int]) -> int:
+	var largest_card_id: int = -1
+	var first_color: Card.CardColor = _get_first_color_card(card_ids)
+	if first_color == Card.CardColor.WHITE:
+		return card_ids[0] # first one wins if all played cards are white
+	else:
+		for card_id in card_ids:
+			if full_deck[card_id].color == first_color and card_id > largest_card_id:
+				largest_card_id = card_id
+		
+		return largest_card_id
+
+## Returns the color of the first non-white card played.
+## Returns WHITE if all cards played are white.
+func _get_first_color_card(card_ids: Array[int]) -> Card.CardColor:
+	for card_id in card_ids:
+		if not full_deck[card_id].color == Card.CardColor.WHITE:
+			return full_deck[card_id].color
+	return Card.CardColor.WHITE
+
 func _get_card_name(card_id: int) -> String:
 	var color: String
 	var suffix: String