import { Injectable } from '@angular/core';
import {TemplateModel} from '../models/template.model';
import {ApiService} from './api.service';
import {MaterialModel} from '../models/material.model';
import {BaseModel} from '../models/base.model';
import {UserModel} from '../models/user.model';

@Injectable({
  providedIn: 'root'
})
export class DataService {

  constructor(
    private api: ApiService
  ) { }

  private collectionMap = {
    materials: {path: '/materials?status=all', model: MaterialModel, array: true},
    materialSuppliers: {path: '/material/suppliers', model: null, array: true},
    materialGroups: {path: '/material/groups', model: null, array: true},
    materialTemplates: {path: '/template/materials', model: TemplateModel, array: true},
    measurementTemplates: {path: '/template/measurements', model: TemplateModel, array: true},
    conditionTemplates: {path: '/template/conditions', model: TemplateModel, array: true},
    sampleNotesFields: {path: '/sample/notes/fields', model: TemplateModel, array: true},
    users: {path: '/users', model: UserModel, array: true},
    user: {path: '/user', model: UserModel, array: false},
    userKey: {path: '/user/key', model: BaseModel, array: false}
  };

  arr: {[key: string]: any[]} = {};  // array of data
  id: {[key: string]: {[id: string]: any}} = {};  // data in format _id: data
  d: {[key: string]: any} = {};      // data not in array format

  load(collection, f = () => {}) {  // load data
    if (this.arr[collection]) { // data already loaded
      f();
    }
    else {  // load data
      this.api.get<any>(this.collectionMap[collection].path, data => {
        if (this.collectionMap[collection].array) {  // array data
          this.arr[collection] = data
            .map(e => this.collectionMap[collection].model ? new this.collectionMap[collection].model().deserialize(e) : e);
          this.idReload(collection);
        }
        else {  // not array data
          this.d[collection] = new this.collectionMap[collection].model().deserialize(data);
        }
        f();
      });
    }
  }

  idReload(collection) {
    this.id[collection] = this.arr[collection].reduce((s, e) => {s[e._id] = e; return s; }, {});
  }
}