fixed # 修复作物资源位置不对的历史遗留BUG

add # 新增作物会生虫的逻辑

src/farm_core/pests.py

@@ -0,0 +1,67 @@
+"""离线虫害时间结算；只投影状态，不读写数据库或使用随机数。"""
+
+from dataclasses import replace
+
+from .domain import Plot, integer
+
+
+def season_duration(plot: Plot) -> int:
+    return (plot.plant.growth_seconds if plot.harvest_count == 0
+            else plot.plant.regrowth_seconds)
+
+
+def spawn_interval(plot: Plot) -> int:
+    return max(3600, (season_duration(plot) + 3) // 4)
+
+
+def start_growth(plot: Plot, now: int) -> Plot:
+    duration = season_duration(plot)
+    return advance_plot(replace(
+        plot, mature_at=integer(now + duration), pest_count=0, pest_spawned=0,
+        growth_remaining=integer(duration * 100), growth_updated_at=now,
+        next_pest_at=integer(now + spawn_interval(plot)), maturity_pests=0,
+    ), now)
+
+
+def _advance(remaining, cursor, pests, spawned, next_at, interval, now):
+    while remaining:
+        rate = 100 - pests * 5
+        finish = integer(cursor + (remaining + rate - 1) // rate)
+        if finish <= now and (next_at is None or finish <= next_at):
+            return 0, finish, pests, spawned, None, finish
+        end = min(now, next_at) if next_at is not None else now
+        remaining -= (end - cursor) * rate
+        cursor = end
+        if next_at is None or cursor < next_at:
+            break
+        pests += 1
+        spawned += 1
+        next_at = integer(next_at + interval) if spawned < 3 else None
+        if cursor == now:
+            break
+    return remaining, cursor, pests, spawned, next_at, None
+
+
+def advance_plot(plot: Plot, now: int) -> Plot:
+    integer(now)
+    if (plot.plant is None or plot.withered
+            or plot.growth_remaining is None or not plot.growth_remaining):
+        return plot
+    if now < plot.growth_updated_at:
+        return plot
+    interval = spawn_interval(plot)
+    remaining, cursor, pests, spawned, next_at, finish = _advance(
+        plot.growth_remaining, plot.growth_updated_at, plot.pest_count,
+        plot.pest_spawned, plot.next_pest_at, interval, now,
+    )
+    if finish is None:
+        finish = _advance(
+            remaining, cursor, pests, spawned, next_at, interval,
+            integer(cursor + (remaining + 84) // 85),
+        )[-1]
+    return replace(
+        plot, mature_at=finish, pest_count=pests, pest_spawned=spawned,
+        growth_remaining=remaining, growth_updated_at=cursor,
+        next_pest_at=next_at,
+        maturity_pests=pests if remaining == 0 else 0,
+    )