import { DestructionVolume } from '../geometry/DestructionVolume';
import { validateDestructionDefinition, type DestructionDefinition } from './Destruction';
import type { Stars } from './Stars';

export interface DestructionSnapshot {
  elapsed:number;started:boolean;finished:boolean;complete:boolean;stars:Stars;removedPercent:number;
}
/** 최초 접촉 이후의 게임 시간과 남은 원본 재료 수로만 채점한다. */
export class DestructionSession {
  private elapsed=0;
  private compensation=0;
  private started=false;
  private finished=false;
  private complete=false;
  private stars:Stars=0;
  private remaining:number;
  private readonly initialCount:number;

  constructor(private readonly def:DestructionDefinition,initialCount?:number) {
    validateDestructionDefinition(def);
    this.initialCount=initialCount??new DestructionVolume(def).initialCount;
    if(!Number.isInteger(this.initialCount)||this.initialCount<=0)throw new Error('원본 재료 수가 유효하지 않음');
    this.remaining=this.initialCount;
  }
  start():void {if(!this.finished)this.started=true;}
  advance(dt:number,remainingCount:number):void {
    if(!Number.isFinite(dt)||dt<0||!Number.isInteger(remainingCount)||remainingCount<0||remainingCount>this.initialCount) {
      throw new Error('파괴 시간 또는 남은 재료 수가 유효하지 않음');
    }
    if(this.finished||!this.started)return;
    const increment=dt-this.compensation,total=this.elapsed+increment;
    this.compensation=(total-this.elapsed)-increment;
    this.elapsed=total;this.remaining=remainingCount;
    const [three,two,limit]=this.def.starTimes;
    if(remainingCount===0&&this.elapsed<=limit+1e-9) {
      this.complete=true;this.finished=true;
      this.stars=this.elapsed<=three+1e-9?3:this.elapsed<=two+1e-9?2:1;
    } else if(this.elapsed>=limit-1e-9){this.finished=true;this.elapsed=limit;}
  }
  snapshot():DestructionSnapshot {
    return {elapsed:this.elapsed,started:this.started,finished:this.finished,complete:this.complete,stars:this.stars,
      removedPercent:(this.initialCount-this.remaining)/this.initialCount*100};
  }
}