import Component from '@/ecs/component.js';

export default class Alive extends Component {
  instanceFromSchema() {
    const {ecs} = this;
    return class AliveInstance extends super.instanceFromSchema() {
      $$dead = false;
      acceptDamage(amount) {
        const health = Math.min(this.maxHealth, Math.max(0, this.health + amount));
        this.health = health;
        if (0 === health) {
          this.die();
        }
      }
      die() {
        if (this.$$dead) {
          return;
        }
        this.$$dead = true;
        const {Ticking} = ecs.get(this.entity);
        if (Ticking) {
          const ticker = this.$$death.ticker();
          ecs.addDestructionDependency(this.entity.id, ticker);
          Ticking.add(ticker);
        }
      }
    };
  }
  async load(instance) {
    // heavy handed...
    if ('undefined' !== typeof window) {
      return;
    }
    instance.$$death = await this.ecs.readScript(
      instance.deathScript,
      {
        ecs: this.ecs,
        entity: this.ecs.get(instance.entity),
      },
    );
    if (0 === instance.maxHealth) {
      instance.maxHealth = instance.health;
    }
  }
  static properties = {
    deathScript: {
      defaultValue: '/assets/misc/death-default.js',
      type: 'string',
    },
    health: {type: 'uint32'},
    maxHealth: {type: 'uint32'},
  };
}