Homework/React/react_hw_2/App.js

import './App.css';
import { useEffect, useState } from 'react'

const Timer = ({ timeInSeconds }) => {
  const [time, setTime] = useState(timeInSeconds)
  const [isPaused, setPaused] = useState(false)

  const hours = Math.floor(time / (60 * 60))
  const minutes = Math.floor((time % (60 * 60)) / 60)
  const seconds = Math.ceil((time % (60 * 60)) % 60)

  useEffect(() => {
    let interval = setInterval(() => {setTime(time => time - 1)}, 1000)
    if (time === 0 || isPaused) {
      clearInterval(interval)
    }

    return () => {clearInterval(interval)}
  }, [time, isPaused])

  useEffect(() => {
    setTime(timeInSeconds)
  }, [timeInSeconds])

  return (
    <>
    <div>{hours}:{minutes}:{seconds}</div>
    <button onClick={() => setPaused(!isPaused)}> астанавись/прадалжай </button>
    </>
  )
}

const TimerControl = ({setTimeCB}) => {
  const [hours, setHours] = useState('')
  const [minutes, setMinutes] = useState('')
  const [seconds, setSeconds] = useState('')

  const timeToSeconds = (hours, minutes, seconds) => {
    let time = (+hours * 60 * 60) + (+minutes * 60) + +seconds
    return time
  }

  const valuesDisappear = () => {
    setHours('')
    setMinutes('')
    setSeconds('')
  }

  return (
    <div>
      <input type="number" placeholder="hours" value={hours} onChange={(e) => setHours(e.target.value)}></input>
      <input type="number" placeholder="minutes" value={minutes} onChange={(e) => setMinutes(e.target.value)}></input>
      <input type="number" placeholder="seconds" value={seconds} onChange={(e) => setSeconds(e.target.value)}></input>
      <button onClick={() => {valuesDisappear(); setTimeCB(timeToSeconds(hours, minutes, seconds))}}>Start</button>
    </div>
  )
}

const TimerContainer = ({seconds, refresh, render: Render}) => {
  const [time, setTime] = useState(seconds)
  const [initialTime] = useState(performance.now())

  useEffect(() => {
    let interval = setInterval(() => {
      setTime(seconds - Math.floor((performance.now() - initialTime) / 1000))
    }, refresh)

    if (time <= 0) {
      setTime(0)
      clearInterval(interval)
    }

    return () => clearInterval(interval)
  }, [time, initialTime, refresh, seconds])

  useEffect(() => {
    setTime(seconds)
  }, [seconds])

  return (
      <Render seconds={time}/>
  )
}

const SecondsTimer = ({seconds}) => <h2>{seconds}</h2>

const LCD = ({seconds: timeInSeconds}) => {
  const hours = Math.floor(timeInSeconds / (60 * 60))
  const minutes = Math.floor((timeInSeconds % (60 * 60)) / 60)
  const seconds = Math.ceil((timeInSeconds % (60 * 60)) % 60)
  return (
    <div>{hours}:{minutes}:{seconds}</div>
  )
}

const Watch = ({seconds: timeInSeconds}) => {
  const hours = Math.floor(timeInSeconds / (60 * 60))
  const minutes = Math.floor((timeInSeconds % (60 * 60)) / 60)
  const seconds = Math.ceil((timeInSeconds % (60 * 60)) % 60)

  const ratioH = 360 / 12 / 60 / 60
  const ratioM = 360 / 60 / 60
  const ratioS = 360 / 60

  const getAngle = (ratio, value) => (ratio * value)

  return (
    <>
    <div>{hours}:{minutes}:{seconds}</div>
    <div style={{position: 'relative'}}>
      <img src='http://draw.asmer.fe.a-level.com.ua/ClockFace/ClockFace.png' style={{position: 'absolute'}} />
      <img src='http://draw.asmer.fe.a-level.com.ua/ClockFace/ClockFace_H.png' style={{position: 'absolute', transform: `rotate(${getAngle(ratioH, timeInSeconds)}deg)`}}/>
      <img src='http://draw.asmer.fe.a-level.com.ua/ClockFace/ClockFace_M.png' style={{position: 'absolute', transform: `rotate(${getAngle(ratioM, timeInSeconds)}deg)`}}/>
      <img src='http://draw.asmer.fe.a-level.com.ua/ClockFace/ClockFace_S.png' style={{position: 'absolute', transform: `rotate(${getAngle(ratioS, timeInSeconds)}deg)`}} />
    </div>
    </>
  )
}


function App() {
  const [time, setTime] = useState(0)
  return (
    <div>
      <Timer timeInSeconds={time} />
      <TimerControl setTimeCB={seconds => setTime(seconds)}/>

      <TimerContainer seconds={1800} refresh={100} render={SecondsTimer}/>
      <TimerContainer seconds={5000} refresh={100} render={LCD}/>
      <TimerContainer seconds={time} refresh={100} render={Watch}/>
    </div>
  );
}

export default App;