import Vue from 'vue';
import utils from '../services/utils';

export default (empty, simpleHash = false) => {
  // Use Date.now as a simple hash function, which is ok for not-synced types
  const hashFunc = simpleHash ? Date.now : item => utils.hash(utils.serializeObject({
    ...item,
    hash: undefined,
  }));

  function setItem(state, value) {
    const item = Object.assign(empty(value.id), value);
    if (!item.hash) {
      item.hash = hashFunc(item);
    }
    Vue.set(state.itemMap, item.id, item);
  }

  function patchItem(state, patch) {
    const item = state.itemMap[patch.id];
    if (item) {
      Object.assign(item, patch);
      item.hash = hashFunc(item);
      Vue.set(state.itemMap, item.id, item);
      return true;
    }
    return false;
  }

  return {
    namespaced: true,
    state: {
      itemMap: {},
    },
    getters: {
      items: state => Object.keys(state.itemMap).map(key => state.itemMap[key]),
    },
    mutations: {
      setItem,
      patchItem,
      deleteItem(state, id) {
        Vue.delete(state.itemMap, id);
      },
    },
    actions: {},
  };
};