import {compose} from '@avocado/core';
import {StateProperty, Trait} from '@avocado/entity';

const decorate = compose(
  StateProperty('life', {
    track: true,
  }),
  StateProperty('maxLife', {
    track: true,
  }),
);

export class Alive extends decorate(Trait) {

  static defaultState() {
    return {
      life: 100,
      maxLife: 100,
    };
  }

  listeners() {
    return {

      tookDamage: (damage) => {
        this.entity.life -= damage.amount;
        // Clamp health between 0 and max.
        this.entity.life = Math.min(
          Math.max(0, this.entity.life),
          this.entity.maxLife
        );
      },

    }
  }

  tick(elapsed) {
    // ded
    // @todo Custom death conditions.
    if (this.entity.life <= 0) {
      const allowDeath = this.entity.invokeHookFlat('allowDeath');
      const overrides = allowDeath.filter((response) => {
        return false === response;
      });
      // Something saved the day.
      if (overrides.length > 0) {

      }
      else {
        // It's a good day to die.
        this.entity.destroy();
      }
    }
  }

}