"use strict";

(function (global) {
  const WEATHER_STATES = Object.freeze(["sunny", "cloudy", "light_rain"]);

  const WeatherSystem = Object.freeze({
    states: WEATHER_STATES,

    chooseNext(current = "sunny") {
      const choices = current === "light_rain"
        ? ["sunny", "cloudy"]
        : ["sunny", "cloudy", "light_rain"];
      return pick(choices);
    },

    resetTimer() {
      return rand(CONFIG.weatherChangeMin, CONFIG.weatherChangeMax);
    },

    shouldDropRainWater(worldRef, dt = 0) {
      return Boolean(
        worldRef?.weather === "light_rain" &&
        (worldRef.itemCounts?.water || 0) < 24 &&
        Math.random() < Math.max(0, Number(dt) || 0) * 0.12
      );
    },

    createRainWaterItem(worldRef) {
      const drop = new Item("water", rand(58, worldRef.w - 58), rand(58, worldRef.h - 58));
      drop.amount = rand(24, 58);
      return drop;
    },

    applyNextWeather(worldRef) {
      if (!worldRef) return null;
      const previous = worldRef.weather || "sunny";
      const next = this.chooseNext(previous);
      worldRef.weather = next;
      worldRef.nextWeatherChange = this.resetTimer();
      if (next !== previous) {
        worldRef.emit?.("weather:changed", { previous, next });
        worldRef.log?.(`\u5929\u6c17: ${weatherLabel(next)}`);
      }
      return next;
    },
  });

  global.TarinaiWeatherSystem = WeatherSystem;
})(typeof window !== "undefined" ? window : globalThis);