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HTML 

              
                <!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>
  </head>
  <body>
    <div id="container"></div>
    <audio id="beep" src="http://www.peter-weinberg.com/files/1014/8073/6015/BeepSound.wav"></audio>
  </body>
</html>
!

CSS 

              
                body{
  background-color: #026873;
  background-image: linear-gradient(90deg, rgba(255,255,255,.07) 50%, transparent 50%),
  linear-gradient(90deg, rgba(255,255,255,.13) 50%, transparent 50%),
  linear-gradient(90deg, transparent 50%, rgba(255,255,255,.17) 50%),
  linear-gradient(90deg, transparent 50%, rgba(255,255,255,.19) 50%);
  background-size: 13px, 29px, 37px, 53px;
}

#container{
  background-color: white;
  margin: 10vw;
  padding: 5vw;
  min-height: 100px;
  min-width: 100px;
  border: 2vw outset #40b8e8;
  border-radius: 5px;
}

#react-container{
  display: flex;
  justify-content: space-evenly;
}

#timer-label{
  padding: 6vw;
}

#break-label,#session-label{
  display: flex;
  justify-content: center;
  align-items: center;
}

#break-label button,#session-label button{
  max-height: 30px;
  margin: 0px 10px;
  border-radius: 5px;
}
!

JS 

              
                /*
Could add:
- Add a clock animation instead of the word "Timer".
*/


//Audio element to play and stop.
let audio = document.getElementById("beep");


class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      session: 25,
      break: 5,
      timer: [0, 0],
      on: false,
      resume: false,
      mode: "Session"
    };
    this.activate = this.activate.bind(this);
    this.reset = this.reset.bind(this);
    this.breakValue = this.breakValue.bind(this);
    this.sessionValue = this.sessionValue.bind(this);
  }

  activate() {
    if (this.state.on == false) {
      if (this.state.resume == false) {
        this.setState({
          on: true,
          resume: true,
          timer: [this.state.session, 0],
          tick: setInterval(() => {
            let actualTimer = this.state.timer;
            if (actualTimer[1] != 0) {
              this.setState({
                timer: [actualTimer[0], actualTimer[1] - 1]
              });
            } else if (actualTimer[0] != 0) {
              this.setState({
                timer: [actualTimer[0] - 1, 59]
              });
            } else {
              if(this.state.mode=="Session"){
                audio.currentTime = 0;
                audio.play();
                this.setState({
                  timer:[this.state.break,0],
                  mode: "Break"
                });
              }else{
                audio.currentTime = 0;
                audio.play();
                this.setState({
                  timer:[this.state.session,0],
                  mode: "Session"
                });
              }
              
            }
          }, 1000)
        });
      } else {
        audio.currentTime = 0;
        audio.play();
        this.setState({
          on: true,
          tick: setInterval(() => {
            let actualTimer = this.state.timer;
            if (actualTimer[1] != 0) {
              this.setState({
                timer: [actualTimer[0], actualTimer[1] - 1]
              });
            } else if (actualTimer[0] != 0) {
              this.setState({
                timer: [actualTimer[0] - 1, 59]
              });
            } else {
              if(this.state.mode=="Session"){
                this.setState({
                  timer:[this.state.break,0],
                  mode: "Break"
                });
              }else{
                this.setState({
                  timer:[this.state.session,0],
                  mode: "Session"
                });
              }
              
            }
          }, 1000)
        });
      }
    } else {
      this.setState({ on: false });
      clearInterval(this.state.tick);
    }
  }

  reset() {
    this.setState({
      session: 25,
      break: 5,
      timer: [0, 0],
      on: false,
      resume: false,
      mode: "Session"
    });    
    clearTimeout(this.state.tick);
    audio.pause();
    audio.currentTime = 0;
  }

  breakValue(value) {
    let newBreak = this.state.break;
    if ((newBreak == 1 && value == -1) || (newBreak == 60 && value == 1)) {
    } else {
      this.setState({
        break: newBreak + value,
        resume: false
      });
    }
  }

  sessionValue(value) {
    let newSession = this.state.session;
    if ((newSession == 1 && value == -1) || (newSession == 60 && value == 1)) {
    } else {
      this.setState({
        session: newSession + value,
        resume: false
      });
    }
  }

  render() {
    return (
      <div id="react-container">
        <div id="timer-label">
          {this.state.mode=="Session" ? <p>Timer</p> : <p>Break-time</p>}
          <br />
          <div id="time-left">
            <center>
              {this.state.timer[0] <= 9 && 0}
              {this.state.timer[0]}:{this.state.timer[1] <= 9 && 0}
              {this.state.timer[1]}
            </center>
          </div>
        </div>
        <div>
          <center>Session</center>
          <div id="session-label">
            <button
              id="session-decrement"
              onClick={() => this.sessionValue(-1)}
            >
              -
            </button>
            <p id="session-length">{this.state.session}</p>
            <button id="session-increment" onClick={() => this.sessionValue(1)}>
              +
            </button>
          </div>
          <center>Break</center>
          <div id="break-label">
            <button id="break-decrement" onClick={() => this.breakValue(-1)}>
              -
            </button>
            <p id="break-length">{this.state.break}</p>
            <button id="break-increment" onClick={() => this.breakValue(1)}>
              +
            </button>
          </div>
          <br />
          <center>
            <button id="start_stop" onClick={() => this.activate()}>
              Start
            </button>
            <button id="reset" onClick={() => this.reset()}>
              Reset
            </button>
          </center>
        </div>
      </div>
    );
  }
}

ReactDOM.render(<App />, document.getElementById("container"));
!
999px

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