import _ from 'lodash';
import { Position } from './List';

export type Collection = string | number;
type Refs = Record<Collection, ManagerRef[]>;

export interface ManagerRef {
  node: HTMLElement;
  edgeOffset: Position;
  info: {
    collection: Collection;
    index: number;
    disabled?: boolean;
    manager: Manager;
  };
}

/*
 * Move manager
 * */
class Manager {
  refs: Refs = {};
  active: ManagerRef;

  add(collection: Collection, ref: ManagerRef) {
    if (!this.refs[collection]) {
      this.refs[collection] = [];
    }
    this.refs[collection].push(ref);
  }

  remove(collection: Collection, ref: ManagerRef) {
    const index = this.getIndex(collection, ref);
    if (index !== -1 && Array.isArray(this.refs[collection])) {
      this.refs[collection].splice(index, 1);
    }
  }

  setActive = (payload: ManagerRef) => (this.active = payload);
  getActive = (): ManagerRef => this.active;

  getIndex = (collection: Collection, ref: ManagerRef) => this.refs[collection].indexOf(ref);
  getNodeManagerRef = (node: HTMLElement): any =>
    _.flatten(Object.values(this.refs)).find((managerRef: any) => managerRef.node === node);

  getOrderedRefs = (collection?: Collection) => {
    if (collection === undefined) {
      collection = this.active ? this.active.info.collection : null;
    }
    if (collection !== null) {
      const sortedRefs = [...this.refs[collection]];
      sortedRefs.sort((nodeInfo1, nodeInfo2) => nodeInfo1.info.index - nodeInfo2.info.index);
      return sortedRefs;
    }
    return [];
  };
}

export default Manager;