import { Observable } from 'rxjs'
import { Ready, changed, map, tap} from '../src/ready'
import { EventEmitter } from 'events'

let emitter = new EventEmitter()

// let verbose = process.env.VERBOSE==='true'

let combo = false

// handler: (r)=> console.log('result:',r)

const late=3000

let example = new Ready({emitter: emitter})

let subscribe = ()=>{
  console.log('subscribing at',late, 'ms')
  example.subscribe(ready => {
    console.log(`-----------Subscriber at ${late} ms--------------?`,ready)
    console.log('the failed observer:', example.failure, ',details:', example.getObserverDetails(example.failure))
    console.log('the total state', example.state)
    console.log('---------------------------------------')
  })
}

if (!late) subscribe()
else setTimeout(subscribe,late)

const tObs = new Observable(subscriber => {
  subscriber.next('on')
  subscriber.next('off')
  subscriber.next('enabled')
  setTimeout(() => {
    subscriber.next('F')
  }, 7000)
  setTimeout(() => {
    subscriber.next('T')
  }, 8000)
})


example.addObserver('obs',tObs,{details:{desc:'this is a constructed observable from the Observable Class'}})

const tPromise = new Promise(function(resolve) {
  setTimeout(()=>{
    console.log('promise observer is resolving')
    resolve('yes')
  },1000)
})

example.addObserver('e',{details:{desc:'this is the e observer which comes from an emitter'}})
example.addObserver('ce',{condition: (ev)=>ev.ready, event:'ec'})
example.addObserver('pe',emitter)
example.addObserver('pr',tPromise)
example.addObserver('extnd',example.getObserver('e').pipe(
  map(state => {
    // console.log('+++++++++++\n','extend before:',state)
    if (state) {
      let val = Math.floor(Math.random() * Math.floor(10))
      // console.log(val)
      state = val <11 ? true:false
    }
    // console.log('extend  after:',state,'\n-------------')
    return state
  })
),{details:'an observer extension of the e observer'})

if (combo) {
  let combo = example.combineObservers('combo',['e','pr'])
    .pipe(
      tap(state=>console.log('combo e and pr state:',state)),
      changed()  // only emit if changed
    )

  if (combo){
    console.log('subscribing to sub combination e, pr')
    example.subscribe('combo',val => console.log('combo e, pr is:',val))
  }
}

emitter.emit('ec',{ready:true})
emitter.emit('pe','yup')
emitter.emit('e')
console.log('===============done initial emitting, pe,e,ec/ce=================')
setTimeout(async () => {
  console.log('============emitting e, pe false===================')
  example.setObserverDetails('e',{moreinfo:'an additional property of details added later'})
  emitter.emit('e',false)
  emitter.emit('pe',false)
}
  ,2000)
setTimeout(async () => {
  console.log('=================emitting e true, removing pe which is false ================')
  emitter.emit('e',true)
  example.removeObserver('pe')
}
  ,4000)

setTimeout(async () => {console.log('timeout done')},6000)