"use strict";

// Layer: simulation/system-environment
// Owns frame time, world clock, frame signals, weather/terrain preparation,
// phase-change notification, and diagnostics publication.
(function (global) {
  function normalizeDelta(worldRef, dt) {
    if (!worldRef || worldRef.paused) return null;
    return dt * worldRef.speed;
  }

  function updateClock(worldRef, dt) {
    const previousDay = worldRef.day || 1;
    worldRef.time += dt;
    worldRef.elapsedDays = Math.max(0, Math.floor(worldRef.time / CONFIG.dayLength));
    worldRef.day = worldRef.elapsedDays + 1;
    if (worldRef.day !== previousDay) {
      for (const t of worldRef.tarinai || []) if (t) t.personalityDaily = { day: worldRef.day, total: 0, byKey: {}, byCause: {} };
      global.TarinaiAchievements?.evaluateEvent?.(worldRef, "season", { previousDay, day: worldRef.day });
    }
  }

  function updateFrameSignals(worldRef, dt) {
    if (worldRef.pointer) worldRef.pointer.motion = Math.max(0, (worldRef.pointer.motion || 0) - dt * 2.4);
    const recoilX = Number(worldRef.shootCursorOffsetX) || 0;
    const recoilY = Number(worldRef.shootCursorOffsetY) || 0;
    if (recoilX || recoilY) {
      // Recoil is a real aim offset, but it should settle back to the actual
      // mouse/touch position in roughly 1-2 seconds instead of drifting forever.
      const k = Math.exp(-Math.max(0, Number(dt) || 0) * 3.15);
      worldRef.shootCursorOffsetX = Math.abs(recoilX * k) < 0.25 ? 0 : recoilX * k;
      worldRef.shootCursorOffsetY = Math.abs(recoilY * k) < 0.25 ? 0 : recoilY * k;
      worldRef.drawListDirty = true;
    }
    worldRef.shakeTimer = Math.max(0, (worldRef.shakeTimer || 0) - dt);
    if ((worldRef.shakeTimer || 0) <= 0) { worldRef.shakeDuration = 0; worldRef.shakeStrength = 0; }
  }

  function updateEnvironment(worldRef, dt) {
    worldRef.updateWeather(dt);
    worldRef.updateTemperature?.(dt);
    worldRef.updateTerrainDirtyState?.(dt);
    const now = worldRef.time || 0;
    if (now >= (worldRef.nextColonyMoodEvalAt || 0)) worldRef.evaluateColonyMood?.();
  }

  function prepareSpatialFrame(worldRef) {
    if (global.TarinaiPerf?.diagnosticsEnabled?.() === true) {
      worldRef.spatialRebuildsThisFrame = 0;
      worldRef.spatialDirtyMarksThisFrame = 0;
    }
    worldRef.ensureSpatial?.("update-start");
    worldRef.beginFramePerformanceBudgets?.();
  }

  function emitPhaseChange(worldRef) {
    const phase = worldRef.phaseName();
    if (phase !== worldRef.lastPhase) {
      worldRef.lastPhase = phase;
      worldRef.emit("world:phase", { world: worldRef, phase });
    }
  }

  function finalizeDiagnostics(worldRef) {
    if (!worldRef) return;
    const wantsDiagnostics = Boolean(global.__tarinaiDebugOverlayEnabled || global.__tarinaiForceRuntimeDiagnostics);
    worldRef.lastRuntimeDiagnostics = wantsDiagnostics ? (worldRef.runtimeDiagnostics?.() || null) : null;
  }

  const phases = Object.freeze({
    normalizeDelta,
    updateClock,
    updateFrameSignals,
    updateEnvironment,
    prepareSpatialFrame,
    emitPhaseChange,
    finalizeDiagnostics,
  });

  global.TarinaiEnvironmentSimulationSystem = Object.freeze({ phases });
})(typeof window !== "undefined" ? window : globalThis);