"use strict";

// Layer: simulation/system-ambient-spawn
// Owns low-frequency ambient Tarinai/grass/rain-water creation.
(function (global) {
  function spawnAmbientTarinai(worldRef, dt) {
    if (worldRef.tarinai.length > 0 && worldRef.tarinai.length <= 10 && worldRef.time - (worldRef.lastBirthAt || -999) > 12 && Math.random() < dt * 0.022) {
      const spot = worldRef.edgeSpawnPoint(null, null, 42, true);
      const t = worldRef.addTarinai({ x: spot.x, y: spot.y, vx: spot.vx, vy: spot.vy, entryTimer: 2.0 });
      t.wanderAngle = spot.angle;
      t.surpriseTimer = Math.max(t.surpriseTimer || 0, 0.35);
      worldRef.log(`${t.name}\u304c\u753b\u9762\u5916\u304b\u3089\u8ff7\u3044\u8fbc\u3093\u3067\u304d\u305f\u3002`);
    }
  }

  function spawnAmbientGrass(worldRef, dt) {
    if ((worldRef.groundGrassMultiplier?.() ?? 1) <= 0) return;
    const groundGrowthMul = Math.max(0, Number(global.TarinaiGround?.grassGrowthMultiplier?.(worldRef.groundType || "soil") ?? (worldRef.groundGrassMultiplier?.() ?? 1)) || 0);
    if (groundGrowthMul <= 0) return;
    if ((worldRef.canAddGrass?.(1) ?? true) && Math.random() < dt * 0.070 * groundGrowthMul) {
      const spot = worldRef.findGrassPlantingSpot(rand(60, worldRef.w - 60), rand(60, worldRef.h - 60), {
        allowOriginal: true,
        minRadius: 28,
        maxRadius: 140,
        attempts: 18,
      });
      if (spot) {
        const sprout = new Item("grass", spot.x, spot.y);
        global.TarinaiGrass?.setStage?.(sprout, 0, { force: true });
        if (worldRef.addItem) worldRef.addItem(sprout, "grass-spawn");
        else worldRef.items.push(sprout);
      }
    }
  }

  function spawnRainWater(worldRef, dt) {
    // Rain visuals are diagonal line streaks in render.js. This branch creates
    // horizontal oval water items spawned by rain; it intentionally does not
    // share the rain overlay renderer.
    if (global.TarinaiWeatherSystem?.shouldDropRainWater?.(worldRef, dt)) {
      const drop = global.TarinaiWeatherSystem.createRainWaterItem(worldRef);
      worldRef.addItem?.(drop, "rain-water") || worldRef.items.push(drop);
      worldRef.emit?.("rain:itemDropped", { item: drop, type: "water" });
    }
  }

  global.TarinaiAmbientSimulationSystem = Object.freeze({
    phases: Object.freeze({ spawnAmbientTarinai, spawnAmbientGrass, spawnRainWater }),
  });
})(typeof window !== "undefined" ? window : globalThis);