Track donations per item

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

game.py

@@ -1542,7 +1542,7 @@ RAID_TRAITS = ["lightly armoured, heavy on archers", "mounted and fast, few bows
 
 # --- world ---------------------------------------------------------------
 
-WORLD_VERSION = 33
+WORLD_VERSION = 34
 
 
 def new_world(now: float, speed: float = 1.0) -> dict:
@@ -1798,6 +1798,11 @@ def migrate(world: dict, now: float | None = None) -> dict:
         for player in world["players"].values():
             player.setdefault("bury", True)
         world["version"] = 33
+    if world["version"] < 34:
+        # Donation history per item, from here on.
+        for player in world["players"].values():
+            player.setdefault("gave", {})
+        world["version"] = 34
     return world
 
 
@@ -2058,6 +2063,7 @@ def new_player(uid: str, name: str, cls: str, now: float) -> dict:
         "rented": 0, "boosts": [], "bought": None, "deeds": {}, "owned": [], "look": dict(DEFAULT_LOOK),
         "garrison": False,
         "donated": 0,
+        "gave": {},  # item (or "gold"): {qty, worth, favour} given to the city, see credit()
         "pinned": [],  # skills pinned to the top of the sidebar
         "tracked": None,  # recipe shown under the top bar
     }
@@ -2131,13 +2137,26 @@ def bank_add(world: dict, player: dict, item: str, qty: int, now: float, summary
         overflow = summary["overflow"]
         stockpile = world["city"]["stockpile"]
         stockpile[item] = stockpile.get(item, 0) + spill
-        gain = spill * ITEMS[item]["value"]
-        player["favour"] += gain * OVERFLOW_FAVOUR
-        player["donated"] += gain
+        credit(player, item, spill, OVERFLOW_FAVOUR)
         overflow[item] = overflow.get(item, 0) + spill
     return keep
 
 
+def credit(player: dict, item: str, qty: int, rate: float) -> None:
+    """Favour for giving `qty` of an item (or gold) to the city, at `rate` per point of worth.
+
+    Every gift is tallied per item in `gave`: how many, their worth at the time, and the
+    favour paid for them, so a later revalue can recompute favour exactly.
+    """
+    worth = qty * (1 if item == "gold" else ITEMS[item]["value"])
+    player["favour"] += worth * rate
+    player["donated"] += worth
+    tally = player["gave"].setdefault(item, {"qty": 0, "worth": 0, "favour": 0})
+    tally["qty"] += qty
+    tally["worth"] += worth
+    tally["favour"] += worth * rate
+
+
 def bank_take(player: dict, item: str, qty: int) -> None:
     left = player["bank"][item] - qty
     if left > 0:
@@ -4036,7 +4055,6 @@ def donate(world: dict, player: dict, item: str, qty: int, now: float) -> str |
             return "Not enough gold"
         player["gold"] -= qty
         city["treasury"] += qty
-        gain = qty
         label = f"{qty:,} gold"
     else:
         if not city_uses(item):
@@ -4045,10 +4063,8 @@ def donate(world: dict, player: dict, item: str, qty: int, now: float) -> str |
             return "You don't have that many"
         bank_take(player, item, qty)
         city["stockpile"][item] = city["stockpile"].get(item, 0) + qty
-        gain = qty * ITEMS[item]["value"]
         label = amount(item, qty)
-    player["favour"] += gain * city_rate(world, "favour")
-    player["donated"] += gain
+    credit(player, item, qty, city_rate(world, "favour"))
     log(world, now, "donation", f"{player['name']} donated {label}", player["id"])
     return None
 
@@ -4115,9 +4131,7 @@ def fund(world: dict, player: dict, key: str, item: str, qty: int | str, source:
             player["gold"] -= qty
         else:
             bank_take(player, item, qty)
-        gain = qty * (1 if item == "gold" else ITEMS[item]["value"])
-        player["favour"] += gain * city_rate(world, "favour")
-        player["donated"] += gain
+        credit(player, item, qty, city_rate(world, "favour"))
     elif item == "gold":
         city["treasury"] -= qty
     else:
@@ -4148,9 +4162,7 @@ def install(world: dict, player: dict, fitting: str, source: str, now: float) ->
         if not player["bank"].get(fitting):
             return "You don't have one"
         bank_take(player, fitting, 1)
-        gain = ITEMS[fitting]["value"]
-        player["favour"] += gain * city_rate(world, "favour")
-        player["donated"] += gain
+        credit(player, fitting, 1, city_rate(world, "favour"))
     elif source == "city":
         if not city["stockpile"].get(fitting):
             return "There isn't one in the stockpile"
@@ -4379,8 +4391,7 @@ def pay_wages(world: dict, player: dict, qty, source: str, now: float) -> str |
     qty = min(qty, room)
     if source == "bank":
         player["gold"] -= qty
-        player["favour"] += qty * city_rate(world, "favour")
-        player["donated"] += qty
+        credit(player, "gold", qty, city_rate(world, "favour"))
         log(world, now, "donation", f"{player['name']} paid {qty:,} gold of guard wages", player["id"])
     else:
         city["treasury"] -= qty
@@ -5417,9 +5428,7 @@ def aid_problem(world: dict, player: dict, kind: str, item: str, source: str, no
         return "Nothing to give"
     if source == "bank":
         bank_take(player, item, qty)
-        gain = qty * ITEMS[item]["value"] * city_rate(world, "favour")
-        player["favour"] += gain
-        player["donated"] += qty * ITEMS[item]["value"]
+        credit(player, item, qty, city_rate(world, "favour"))
     else:
         take_stock_qty(stock, item, qty)
     problem["progress"][item] = problem["progress"].get(item, 0) + qty