import { CFG } from './config.js';
import { FX } from './fx.js';

// ============================================================
// THE JUICE BUDGET.
// Written FIRST, before bolts/detonations/cascades can stack on it.
// Without a cap, a chain reaction reads as "the game crashed"
// rather than "the game is going off".
// ============================================================

const win = [];              // [{t, ms}] hitstop spend inside the window
let clock = 0;

export const Juice = {
  tick(dt) {
    clock += dt;
    while (win.length && clock - win[0].t > CFG.JUICE_WINDOW) win.shift();
  },

  spent() {
    let s = 0;
    for (const e of win) s += e.ms;
    return s;
  },

  // request hitstop; returns what was actually granted
  hitstop(ms) {
    const room = Math.max(0, CFG.JUICE_HITSTOP_CAP - this.spent());
    const grant = Math.min(ms, room);
    if (grant > 0) {
      win.push({ t: clock, ms: grant });
      FX.freeze(grant / 1000);
    }
    return grant;
  },

  // trauma is self-limiting (clamped 0..1 + decay) but funnel it here
  // so every source is auditable in one place
  trauma(camera, v) { camera.addTrauma(v); },

  reset() { win.length = 0; clock = 0; },
};