P4 hazards: food spoilage with rot speed setting, smoking rack and salt, food poisoning, harsher blizzards, hard winters with lake ice, lightning on trees, snow on roofs (protocol 11)

scripts/core/inventory.gd

@@ -33,19 +33,103 @@ static func _stack_max(id: String) -> int:
 
 ## A stack can carry "dur": uses left on a tool or weapon that wears out
 ## (ItemDB "durability"). No "dur" means as new.
+## Food that spoils (ItemDB "keeps", in days) carries "rot": the world time
+## (seconds since day 1, 00:00) at which it goes rotten. It's stamped when
+## the food first goes into an inventory; two stacks that merge share the
+## average. world.gd turns rotten stacks into rotten food (spoil()).
 static func _norm(stack):
 	if stack == null or int(stack.count) <= 0:
 		return null
 	var out := {"id": String(stack.id), "count": int(stack.count)}
 	if stack.has("dur"):
 		out.dur = int(stack.dur)
+	if stack.has("rot"):
+		out.rot = float(stack.rot)
 	return out
 
-## Adds a whole stack, keeping what's special about it (a worn tool's "dur").
-## Returns how many didn't fit.
+## What's special about a stack, for when it's dropped on the ground (and
+## kept when it's picked up again): a tool's wear, food's freshness.
+static func extra_of(stack: Dictionary) -> Dictionary:
+	var out := {}
+	if stack.has("dur"):
+		out.dur = int(stack.dur)
+	if stack.has("rot"):
+		out.rot = float(stack.rot)
+	return out
+
+# --- spoilage (P4, docs/PROGRESSION_DESIGN.md §5) ---------------------------------
+
+## The world clock (seconds since day 1, 00:00) and how long a day is, kept
+## up to date by world.gd. `rot_speed`: 1 normal, 0.5 slow, 0 off (the
+## world's or server's "rot" setting).
+static var clock := 0.0
+static var day_seconds := 1200.0
+static var rot_speed := 1.0
+const ROTTEN := "rotten_food"
+
+static func _db() -> Node:
+	return (Engine.get_main_loop() as SceneTree).root.get_node_or_null("ItemDB")
+
+## Days `id` keeps before it rots (0: it doesn't).
+static func keeps_days(id: String) -> float:
+	var db := _db()
+	return float(db.get_item(id).get("keeps", 0.0)) if db != null else 0.0
+
+## How long `id` keeps, in world seconds, at the current rot speed (0: forever).
+static func keeps_for(id: String) -> float:
+	var d := keeps_days(id)
+	if d <= 0.0 or rot_speed <= 0.0:
+		return 0.0
+	return d * day_seconds / rot_speed
+
+## The "rot" stamp for `id` made right now (-1: it doesn't spoil).
+static func fresh_rot(id: String) -> float:
+	var k := keeps_for(id)
+	# (Whole seconds, so a stamp comes back from a JSON save exactly as it went in.)
+	return roundf(clock + k) if k > 0.0 else -1.0
+
+## 0..1: how fresh a stack is (1 = just made or doesn't spoil).
+static func freshness(stack) -> float:
+	if stack == null or not stack.has("rot"):
+		return 1.0
+	var k := keeps_for(String(stack.id))
+	if k <= 0.0:
+		return 1.0
+	return clampf((float(stack.rot) - clock) / k, 0.0, 1.0)
+
+## In-game hours until a stack rots (INF: never).
+static func hours_left(stack) -> float:
+	if stack == null or not stack.has("rot") or rot_speed <= 0.0:
+		return INF
+	return maxf(float(stack.rot) - clock, 0.0) / day_seconds * 24.0
+
+## Stamps food that has no "rot" yet, and turns food past its time into
+## rotten food. Returns how many items went rotten.
+func spoil() -> int:
+	if rot_speed <= 0.0:
+		return 0
+	var rotted := 0
+	var touched := false
+	for i in range(slots.size()):
+		var s = slots[i]
+		if s == null or keeps_days(String(s.id)) <= 0.0:
+			continue
+		if not s.has("rot"):
+			s.rot = fresh_rot(String(s.id))
+			touched = true
+		elif clock >= float(s.rot):
+			rotted += int(s.count)
+			slots[i] = {"id": ROTTEN, "count": int(s.count)}
+			touched = true
+	if touched:
+		changed.emit()
+	return rotted
+
+## Adds a whole stack, keeping what's special about it (a worn tool's "dur",
+## food's "rot"). Returns how many didn't fit.
 func add_stack(stack: Dictionary) -> int:
 	if not stack.has("dur"):
-		return add(String(stack.id), int(stack.count))
+		return add(String(stack.id), int(stack.count), float(stack.get("rot", -1.0)))
 	for i in range(slots.size()):
 		if slots[i] == null:
 			slots[i] = _norm(stack)
@@ -72,14 +156,18 @@ func space_for(id: String) -> int:
 	return room
 
 ## Adds up to `n` of `id`, topping up existing stacks first. Returns the
-## leftover that didn't fit (0 = everything fitted).
-func add(id: String, n: int) -> int:
+## leftover that didn't fit (0 = everything fitted). Food gets a fresh "rot"
+## stamp, or `rot` if it's coming from somewhere with one of its own.
+func add(id: String, n: int, rot: float = -1.0) -> int:
 	var cap := _stack_max(id)
+	var r := rot if rot >= 0.0 else fresh_rot(id)
 	for s in slots:
 		if n <= 0:
 			break
 		if s != null and s.id == id and s.count < cap:
 			var take := mini(cap - s.count, n)
+			if r >= 0.0:
+				s.rot = _mix_rot(s, r, take)
 			s.count += take
 			n -= take
 	for i in range(slots.size()):
@@ -88,10 +176,20 @@ func add(id: String, n: int) -> int:
 		if slots[i] == null:
 			var take := mini(cap, n)
 			slots[i] = {"id": id, "count": take}
+			if r >= 0.0:
+				slots[i].rot = r
 			n -= take
 	changed.emit()
 	return n
 
+## The "rot" of stack `s` once `n` more with `rot` are added to it: the
+## average, so mixing fresh and old food gives you food in between.
+static func _mix_rot(s: Dictionary, rot: float, n: int) -> float:
+	if rot < 0.0:
+		return float(s.get("rot", -1.0))
+	var have := float(s.get("rot", rot))
+	return roundf((have * int(s.count) + rot * n) / float(int(s.count) + n))
+
 ## Removes `n` of `id` (from the last stacks first, so the hotbar keeps its
 ## items longest). Returns false and changes nothing if there aren't enough.
 func remove(id: String, n: int) -> bool:
@@ -135,9 +233,16 @@ func quick_move(i: int, other: Inventory) -> void:
 	if s == null:
 		return
 	var left := other.add_stack(s)
-	slots[i] = null if left <= 0 else _norm({"id": s.id, "count": left, "dur": s.dur} if s.has("dur") else {"id": s.id, "count": left})
+	slots[i] = null if left <= 0 else _part(s, left)
 	changed.emit()
 
+## `n` of stack `s`, with its wear or freshness.
+static func _part(s: Dictionary, n: int):
+	var out := extra_of(s)
+	out.id = s.id
+	out.count = n
+	return _norm(out)
+
 ## Clicking slot `i` while holding `cursor` (a stack or null). Returns the new
 ## cursor stack. Left click: pick up / put down / merge / swap. Right click:
 ## pick up half, or put down one.
@@ -150,23 +255,25 @@ func click(i: int, cursor, right: bool):
 		if right and s.count > 1:
 			var half := int(ceil(s.count / 2.0))
 			s.count -= half
-			result = {"id": s.id, "count": half}
+			result = _part(s, half)
 		else:
 			result = s
 			slots[i] = null
 	elif s == null:
 		if right and cursor.count > 1:
-			slots[i] = {"id": cursor.id, "count": 1}
-			result = _norm({"id": cursor.id, "count": cursor.count - 1})
+			slots[i] = _part(cursor, 1)
+			result = _part(cursor, cursor.count - 1)
 		else:
 			slots[i] = cursor
 			result = null
-	elif s.id == cursor.id:
+	elif s.id == cursor.id and not s.has("dur") and not cursor.has("dur"):
 		var cap := _stack_max(s.id)
 		var move: int = 1 if right else cursor.count
 		move = mini(move, cap - s.count)
+		if move > 0 and cursor.has("rot"):
+			s.rot = _mix_rot(s, float(cursor.rot), move)
 		s.count += move
-		result = _norm({"id": cursor.id, "count": cursor.count - move})
+		result = _part(cursor, cursor.count - move)
 	else:
 		slots[i] = cursor
 		result = s