import React, {Component} from 'react';

export default class ClickNHold extends Component {

    constructor(props) {
        super(props);
        this.state = {
            holding: false,
            start: 0,
            ended: 'begin',
        };

        this._timer = null;
        this._unmounted = false;

        this.start = this.start.bind(this);
        this.end = this.end.bind(this);
        this.timeout = this.timeout.bind(this);
    }

    componentWillUnmount() {
        this._unmounted = true;
        clearTimeout(this._timer);
        this._timer = null;
    }

    /* componentDidUpdate(nextState) {
       if (this.state.holding !== nextState.holding) {
         if (this.state.holding === false && this.state.ended === false) {
           document.documentElement.addEventListener('mouseup', this.end);
         }
       }
     }*/

    /*Start callback*/
    start(e){
        let ended = this.state.ended;
        let start = Date.now();

        this.setState({start: start, holding: true, ended: false});
        let rightNumber = this.props.time && this.props.time > 0;
        let time = rightNumber ? this.props.time : 2;
        if (!rightNumber) {console.warn("You have specified an unvalid time prop for ClickNHold. You need to specify a number > 0. Default time is 2.")}
        if (ended) {
            this._timer = setTimeout(function(){this.timeout(start)}.bind(this),
                time*1000+1);
        }
        if (this.props.onStart) {
            this.props.onStart(e);
        }
        document.documentElement.addEventListener('mouseup', this.end);

    }

    /*End callback*/
    end(e) {
        document.documentElement.removeEventListener('mouseup', this.end);
        if(this.state.ended || this._unmounted) {
            return false;
        }
        let endTime = Date.now(); //End time
        let minDiff = this.props.time * 1000; // In seconds
        let startTime = this.state.start; // Start time
        let diff = endTime - startTime; // Time difference
        let isEnough = diff >= minDiff; // It has been held for enough time

        this.setState({holding: false, ended: true});
        if (this.props.onEnd){
            this.props.onEnd(e, isEnough);
        }
    }

    /*Timeout callback*/
    timeout(start){
        if (!this.state.ended && start === this.state.start){
            if(this.props.onClickNHold) {
                this.props.onClickNHold(start);
                if (!this._unmounted) {
                    this.setState({holding: false});
                }
            }
        }
    }

    render() {
        let classList = this.props.className ? (this.props.className +' '):' ';
        classList += this.state.holding ? 'cnh_holding ':'';
        classList += this.state.ended ? 'cnh_ended ':'';
        return (
            <div style={this.props.style}
                 className={classList}
                 onMouseDown={this.start}
                 onTouchStart={this.start}
                 onMouseUp={this.end}
                 onTouchCancel={this.end}
                 onTouchEnd={this.end}>
                {
                    typeof this.props.children === 'object'
                        ? React.cloneElement(this.props.children, { ref: (n) => this.node = n })
                        : null
                }
            </div>);
    }
}