import { Runner } from '@pixi/runner';
import { EventEmitter } from '@pixi/utils';

class SystemManager extends EventEmitter {
  constructor() {
    super(...arguments);
    this.runners = {};
    this._systemsHash = {};
  }
  setup(config) {
    this.addRunners(...config.runners);
    const priority = (config.priority ?? []).filter((key) => config.systems[key]);
    const orderByPriority = [
      ...priority,
      ...Object.keys(config.systems).filter((key) => !priority.includes(key))
    ];
    for (const i of orderByPriority) {
      this.addSystem(config.systems[i], i);
    }
  }
  addRunners(...runnerIds) {
    runnerIds.forEach((runnerId) => {
      this.runners[runnerId] = new Runner(runnerId);
    });
  }
  addSystem(ClassRef, name) {
    const system = new ClassRef(this);
    if (this[name]) {
      throw new Error(`Whoops! The name "${name}" is already in use`);
    }
    this[name] = system;
    this._systemsHash[name] = system;
    for (const i in this.runners) {
      this.runners[i].add(system);
    }
    return this;
  }
  emitWithCustomOptions(runner, options) {
    const systemHashKeys = Object.keys(this._systemsHash);
    runner.items.forEach((system) => {
      const systemName = systemHashKeys.find((systemId) => this._systemsHash[systemId] === system);
      system[runner.name](options[systemName]);
    });
  }
  destroy() {
    Object.values(this.runners).forEach((runner) => {
      runner.destroy();
    });
    this._systemsHash = {};
  }
}

export { SystemManager };
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