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HTML 

              
                <div id="app"></div>
!

CSS 

              
                .container {
  padding: 30px;
}

.row {
  text-align: center;
  padding: 10px;
}

.pomodoroclock {
  border-radius: 50%;
  height: 200px;
  width: 200px;
  font-size: 48px;
}

.focusing {
  color: rgb(217, 83, 79)
}
.break {
  color: rgb(92, 184, 92)
}

.controls {
  height: 30px;
  width: 40px;
  margin-left: 6px;
  margin-right: 6px;
}

.start-stop-control {
  height: 40px;
}

.counter {
  margin: 2px;
  display: inline-block;
  vertical-align: top;
  border-radius: 50%;
  border: 8px solid;
  height: 14px;
  width: 14px;
}

.counter-line {
  height: 14px;
}

.btn:focus,.btn:active {
   outline: none !important;
}
!

JS 

              
                //import React from 'react';
//import ReactDOM from 'react-dom';
const INTERVAL = {
  FOCUSING: 0,
  BREAK: 1
}

const STATUS = {
  RUNNING: 0,
  STOP: 1
}

const INITIAL_STATE = {
  progress: 0,
  defaultFocusing: 25,
  defaultBreak: 5,
  minutes: 25,
  status: STATUS.STOP,
  interval: INTERVAL.FOCUSING,  
  intervalId: null
};

const PomodoroProgress = (props) => {
  let { progress } = props ;
  var progressElements = [];
  while(progress--) {
    progressElements.push(<div className="counter focusing"></div>);
  }
  return (
    <div className="counter-line">{progressElements}</div>
  );
}

const PomodoroClock = (props) => {
  
  const  { 
    minutes, 
    interval,
    onStartFocusing,
    onStartBreak,
    status
  } = props;
  
  const className = ((interval === INTERVAL.FOCUSING) ? "btn-danger" : "btn-success") + " btn pomodoroclock";
  
  let onClick = onStartFocusing;

  if (status === STATUS.RUNNING) {
    onClick = null;
  } else if (interval === INTERVAL.BREAK) {
    onClick = onStartBreak;
  }
  
  return (
    <div>
      <button onClick={onClick} type="button" className={className}>{minutes}</button>
    </div>
  );

}

const PomodoroSettings = (props) => {

  const  { status, onDefaultsUp, onDefaultsDown } = props;
  const className = ((status !== STATUS.STOP) ? "invisible" : "") + " btn btn-warning controls";
  return (
    <div>
      <button 
        onClick={onDefaultsDown}
        type="button" className={className}><span className="glyphicon glyphicon-chevron-down"></span></button>
      <button 
        onClick={onDefaultsUp}
        type="button" className={className}><span className="glyphicon glyphicon-chevron-up"></span></button>        
    </div>
  )
}

const PomodoroControls = (props) => {
  const  { 
    status, 
    interval, 
    onResetProgress,
    onStartFocusing,
    onStartBreak,
    onStopInterval
  } = props;
  
  // Start Focusing by default
  let intervalClass = " btn-danger";
  let label = "Start Focusing";
  let onClick = onStartFocusing;

  if (status === STATUS.RUNNING) {
    intervalClass = " btn-warning";
    label = "Stop";
    onClick = onStopInterval;
  } else if (interval === INTERVAL.BREAK) {
    intervalClass = " btn-success";
    label = "Start Break";
    onClick = onStartBreak;
  }
  
  const className = "btn start-stop-control" + intervalClass;
  const classNameCaret = "btn start-stop-control dropdown-toggle" + intervalClass;

  return (
    <div>
      <div className="btn-group dropup">
        <button type="button" onClick={onClick} className={className}>{label}</button>
        <button type="button" className={classNameCaret} data-toggle="dropdown">              <span className="caret"></span>
        </button>
        <ul className="dropdown-menu" role="menu">
          <li><a href="#" onClick={onStartFocusing}>Start Focusing</a></li>
          <li><a href="#" onClick={onStartBreak}>Start Break</a></li>
          <li role="separator" className="divider"></li>
          <li><a href="#" onClick={onResetProgress}>Reset</a></li>
          <li><a href="#" onClick={onStopInterval}>Stop</a></li>
        </ul>
      </div>        
    </div>
  );
}

class PomodoroApp extends React.Component {
  constructor(props) {
    super(props);
    this.state = INITIAL_STATE;
  }
  
  defaultsChange(delta) {
    const  { 
      minutes, 
      status, 
      interval, 
      defaultBreak, 
      defaultFocusing 
    } = this.state;
    
    // delta can be +1 or -1 so that it increases or decreases
    // the values (set by caller defaultsUp and defaultsDown)
    if (status === STATUS.STOP) {
      if (interval === INTERVAL.FOCUSING) {
        if (defaultFocusing+delta > 0) {
          this.setState({
            defaultFocusing: defaultFocusing+delta,
            minutes: defaultFocusing+delta
          });
        }
      } if (interval === INTERVAL.BREAK) {
        if (defaultBreak+delta > 0) {
          this.setState({
            defaultBreak: defaultBreak+delta,
            minutes: defaultBreak+delta          
          });        
        }
      }
    }
  }
  
  defaultsUp() {
    this.defaultsChange(+1);
  }
  
  defaultsDown() {
    this.defaultsChange(-1);
  }
  
  completeInterval() {
    const  { 
      progress,
      defaultFocusing,
      defaultBreak,
      minutes, 
      status,
      interval,
      intervalId
    } = this.state;

    clearInterval(intervalId); // stop interval
    
    // switch to the next interval (focusing / break)
    const nextInterval = (interval === INTERVAL.FOCUSING) ? INTERVAL.BREAK : INTERVAL.FOCUSING;
    const nextProgress = (interval === INTERVAL.FOCUSING) ? progress + 1 : progress;
    this.setState({
      progress: nextProgress,
      minutes: (nextInterval === INTERVAL.FOCUSING)? defaultFocusing: defaultBreak,
      status: STATUS.STOP,
      interval: nextInterval,  
      intervalId: null
    });
    
    if (interval === INTERVAL.FOCUSING) {
        this.refs.audioEndFocusing.play();
    } else {
        this.refs.audioEndBreak.play();
    }
  }
  
  intervalRun() {
    const  { minutes } = this.state;
    if (minutes-1 === 0) {
      this.completeInterval();
    } else {
      this.setState({minutes: minutes-1});
    }
  }

  startFocusing() {
    const  { defaultFocusing } = this.state;
    this.startInterval(defaultFocusing, INTERVAL.FOCUSING);
  }
  
  startBreak() {
    const  { defaultBreak } = this.state;
    this.startInterval(defaultBreak, INTERVAL.BREAK);
  }
  
  startInterval(totalMinutes, intervalToStart) {
    const  { intervalId } = this.state;

    // clear eventually bug-like previous timer ID
    if (intervalId) {
      clearInterval(intervalId);
    }

    this.setState({
      minutes: totalMinutes,
      interval: intervalToStart,
      status: STATUS.RUNNING
    });
    
    const newIntervalId = setInterval(() => this.intervalRun(), 60000);
    this.setState({
      intervalId: newIntervalId
    });    
    
  }
  
  resetProgress() {

    //TODO: ask confirmation to reset!
    clearInterval(this.state.intervalId);
    this.setState(INITIAL_STATE);
  }

  stopInterval() {
    const  { 
      defaultFocusing,
      defaultBreak,
      interval,
      intervalId
    } = this.state;

    clearInterval(intervalId); // stop interval
    
    this.setState({
      minutes: (interval === INTERVAL.FOCUSING)? defaultFocusing: defaultBreak,
      status: STATUS.STOP,
      intervalId: null
    });
  }
  
  render() {
    const  { progress, minutes, status, interval } = this.state;
    return (
      <div>
        
<div className="container">

  <div className="row">
    <div className="col-sm-4">
    </div>
    <div className="col-sm-4">
      <div className="row">
        <PomodoroProgress progress={progress} />
      </div>      
      <div className="row">
        <PomodoroClock
            status={status}
            minutes={minutes}
            interval={interval}
            onStartBreak={() => this.startBreak()}
            onStartFocusing={() => this.startFocusing()}          
          />
      </div>
      <div className="row">
        <PomodoroSettings 
          status={status}
          onDefaultsUp={() => this.defaultsUp()}
          onDefaultsDown={() => this.defaultsDown()}
          />
      </div>        
      <div className="row">
        <PomodoroControls 
          status={status}
          interval={interval} 
          onStartFocusing={() => this.startFocusing()}
          onResetProgress={() => this.resetProgress()}
          onStartBreak={() => this.startBreak()}
          onStopInterval={() => this.stopInterval()}
          />
      </div>        
        
      <div className="row">
        <h5>React Pomodoro Clock</h5>
        <audio ref="audioEndFocusing" preload="auto" src="http://archive.soundarchive.online/2-1-10044.mp3?_=1" type="audio/mpeg"></audio>        
        <audio ref="audioEndBreak" preload="auto" src="http://archive.soundarchive.online/3-5-10001.mp3?_=9" type="audio/mpeg"></audio>        
      </div>
      
    </div>
    <div className="col-sm-4">
    </div>
  </div>
  
</div>
        

      </div>
    )
  }
}

ReactDOM.render(
    <PomodoroApp/>, 
    document.getElementById('app')
);
!
999px

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