/**
 * lab.js
 * Laboratory logic: accept goods, analyse for special goods,
 * trigger medication production. No rendering, no DOM.
 */

const LabState = Object.freeze({
  IDLE:      'idle',
  ANALYZING: 'analyzing',
});

class Lab {
  constructor() {
    this.reset();
  }

  reset() {
    this.state           = LabState.IDLE;
    this.analyzeTimer    = 0;
    this.totalProcessed  = 0;
    this.flashTimer      = 0;   // brief visual flash on deposit
    this._onMedReady     = null;
  }

  /**
   * Deposit an array of goods into the lab.
   * @param {Good[]}   goods           – goods from player inventory
   * @param {function} onMedicationReady – called (no args) when special analysis completes
   * @returns {number} count of goods deposited
   */
  depositGoods(goods, onMedicationReady) {
    if (!goods.length) return 0;

    let hasSpecial = false;
    goods.forEach(good => {
      this.totalProcessed++;
      if (good.isSpecial) hasSpecial = true;
    });

    // Flash feedback
    this.flashTimer = 500;

    // Start analysis only if we got a special good and aren't already analysing
    if (hasSpecial && this.state === LabState.IDLE) {
      this.state        = LabState.ANALYZING;
      this.analyzeTimer = SETTINGS.LAB_ANALYZE_TIME;
      this._onMedReady  = onMedicationReady;
    }

    return goods.length;
  }

  /** True briefly after goods are deposited (visual feedback). */
  isFlashing() {
    return this.flashTimer > 0;
  }

  /** True while analysing a special good. */
  isAnalyzing() {
    return this.state === LabState.ANALYZING;
  }

  /** Progress 0–1 of the current analysis (0 if idle). */
  analyzeProgress() {
    if (this.state !== LabState.ANALYZING) return 0;
    return 1 - this.analyzeTimer / SETTINGS.LAB_ANALYZE_TIME;
  }

  update(dt) {
    if (this.flashTimer > 0) this.flashTimer -= dt;

    if (this.state === LabState.ANALYZING) {
      this.analyzeTimer -= dt;
      if (this.analyzeTimer <= 0) {
        this.analyzeTimer = 0;
        this.state        = LabState.IDLE;
        if (this._onMedReady) {
          this._onMedReady();
          this._onMedReady = null;
        }
      }
    }
  }
}