git ssb

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import debug from 'debug';
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import Math from './math.js';
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const log = debug('helper:lib:info');
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const error = debug('helper:lib:error');
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export class Lib {
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  constructor() {
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    this.items = [];
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    this._hooks = {};
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  }
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  getById(id) { return this.getArray().filter((item) => (item.id === id))[0]; }
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  getArray() { return this.items.filter((item) => (!item._remove)); }
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  add(item, overwrite = false) {
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    log("add item", item);
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    if ("function" === typeof this._hooks['beforeAdd']) {
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      item = this._hooks['beforeAdd'](item);
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    }
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    if ('undefined' === typeof item.id) {
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      item.id = new Math().uuid();
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    }
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    let existingItem = this.getById(item.id);
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    if ("undefined" !== typeof existingItem) {
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      if (overwrite) {
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        existingItem = item;
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        return existingItem;
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      } else {
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        return log('add duplicate',
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                   'item with this id already exist overwrite != true');
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      }
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    } else {
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      this.items.push(item);
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      return item;
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    }
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  }
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  setHook(type, fn) {
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    log('setHook', type, fn);
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    this._hooks[type] = fn;
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  }
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  remove(id) {
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    log('remove item', id);
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    this.getById(id)._remove = true;
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  }
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  each(cb) {
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    let items = this.getArray();
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    for (let i = items.length; i >= 0; i--) {
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      if (items[i] && items[i].id !== null) {
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        cb(items[i]);
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      }
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    }
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  }
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}
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export default Lib;
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