import { createStoreon, StoreonModule, StoreonEvents } from 'storeon';
import { storeonDevtools } from 'storeon/devtools';
import { environment } from 'src/environments/environment';

// State structure
export interface State {
  count: number;
}

// Events declaration: map of event names to type of event data
export interface Events extends StoreonEvents<State> {
  // `inc` event which does not go with any data
  'inc': undefined;
}

// Initial state, reducers and business logic are packed in independent modules
const counterModule: StoreonModule<State, Events> = store => {
  // Initial state
  store.on('@init', () => ({
    count: 0
  }));

  // Events
  store.on('inc', ({ count }) => ({ count: count + 1 }));
};

export const defaultStore = createStoreon<State, Events>([counterModule, !environment.production && storeonDevtools]);

// your NgModule

import { STOREON } from '@storeon/angular';

@NgModule({
  providers: [{
    provide: STOREON,
    useValue: defaultStore  // your store
  }],
  ...

// your component

import { Component, OnInit } from '@angular/core';
import { Observable } from 'rxjs';
import { StoreonService } from '@storeon/angular';
import { State, Events } from '../app.module';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent implements OnInit {
  changes: Observable<number>;
  constructor(private storeon: StoreonService<State, Events>) { }
  title = 'storeon-angular';

  ngOnInit() {
    this.changes = this.storeon.useStoreon('count');
  }

  updateState() {
    this.storeon.dispatch('inc');
  }
}

// example using Ivy hooks

import { Component, OnInit } from '@angular/core';
import { Observable } from 'rxjs';
import { UseStoreon } from '@storeon/angular';
import { Events, State } from '../app.module';
import { StoreonDispatch } from 'storeon';

@Component({
  selector: 'app-hook-counter',
  templateUrl: './hook-counter.component.html',
  styleUrls: ['./hook-counter.component.scss']
})
@UseStoreon<State, Events>({keys: [ 'count' ], dispatcher: 'dispatch'})
export class HookCounterComponent implements OnInit {

  count: Observable<number>;
  dispatch: StoreonDispatch<Events>;

  constructor() { }

  ngOnInit() {
  }

  increment() {
    this.dispatch('inc');
  }
}