export default class AIOpponent {
  constructor(difficulty = 'normal') {
    this.difficulty = difficulty;
    this.state = 'IDLE';
    this.stateTimer = 0;
    this.barkStrength = 0.7;

    const configs = {
      easy: { idleMin: 0.8, idleMax: 2.5, barkMin: 0.3, barkMax: 0.6, cooldownMin: 0.8, cooldownMax: 1.5, strengthMin: 0.4, strengthMax: 0.7 },
      normal: { idleMin: 1.0, idleMax: 2.5, barkMin: 0.2, barkMax: 0.4, cooldownMin: 0.8, cooldownMax: 1.5, strengthMin: 0.3, strengthMax: 0.5 },
      hard: { idleMin: 0.1, idleMax: 0.6, barkMin: 0.15, barkMax: 0.3, cooldownMin: 0.1, cooldownMax: 0.4, strengthMin: 0.8, strengthMax: 1.0 }
    };
    this.config = configs[difficulty] || configs.normal;
  }

  reset() {
    this.state = 'IDLE';
    this.stateTimer = this._rand(this.config.idleMin, this.config.idleMax);
    this.barkStrength = 0;
  }

  update(dt) {
    this.stateTimer -= dt;
    if (this.stateTimer > 0) return null;

    switch (this.state) {
      case 'IDLE':
        this.state = 'BARK';
        this.stateTimer = this._rand(this.config.barkMin, this.config.barkMax);
        this.barkStrength = this._rand(this.config.strengthMin, this.config.strengthMax);
        return null;

      case 'BARK':
        {
          const power = this.barkStrength * 0.06;
          this.state = 'COOLDOWN';
          this.stateTimer = this._rand(this.config.cooldownMin, this.config.cooldownMax);
          return { type: 'bark', power };
        }

      case 'COOLDOWN':
        this.state = 'IDLE';
        this.stateTimer = this._rand(this.config.idleMin, this.config.idleMax);
        return null;

      default:
        return null;
    }
  }

  _rand(min, max) {
    return min + Math.random() * (max - min);
  }
}