import React from "react";
import WaveSurfer from "wavesurfer.js";

import { MenuBar } from "./menubar";
import { NgIf, Icon } from "../../components/";
import "./audioplayer.scss";

export class AudioPlayer extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            wafesurfer: null,
            loading: true,
            isPlaying: true,
            error: null,
        };
        this.toggle = this.toggle.bind(this);
        window.addEventListener("keypress", this.toggle);
    }

    componentDidMount() {
        const wavesurfer = WaveSurfer.create({
            container: "#waveform",
            waveColor: "#323639",
            progressColor: "#6f6f6f",
            cursorColor: "#323639",
            cursorWidth: 2,
            height: 250,
            barWidth: 1,
        });
        this.setState({ wavesurfer: wavesurfer });
        wavesurfer.on("ready", () => {
            this.setState({ loading: false });
            if (this.state.isPlaying === true) {
                wavesurfer.play();
            }
        });
        wavesurfer.on("error", (err) => {
            this.setState({ error: err, loading: false });
        });
        wavesurfer.load(this.props.data);
    }

    componentWillUnmount() {
        if (this.state.wavesurfer) {
            this.state.wavesurfer.destroy();
        }
        window.removeEventListener("keypress", this.toggle);
    }

    toggle() {
        if (this.state.isPlaying === true) {
            this.setState({ isPlaying: false });
            this.state.wavesurfer.pause();
        } else {
            this.setState({ isPlaying: true });
            this.state.wavesurfer.play();
        }
    }

    onPlay(e) {
        e.preventDefault();
        e.stopPropagation();
        this.setState({ isPlaying: true });
        this.state.wavesurfer.play();
    }

    onPause(e) {
        e.preventDefault();
        e.stopPropagation();
        this.setState({ isPlaying: false });
        this.state.wavesurfer.pause();
    }

    render() {
        return (
            <div className="component_audioplayer">
                <MenuBar title={this.props.filename} download={this.props.data} />
                <div className="audioplayer_container">
                    <NgIf cond={this.state.error !== null} className="audioplayer_error">
                        {this.state.error}
                    </NgIf>
                    <NgIf cond={this.state.error === null}>
                        <NgIf cond={this.state.loading === true}>
                            <Icon name="loading" />
                        </NgIf>
                        <div className="audioplayer_box"
                            style={{ opacity: this.state.loading? "0" : "1" }}>
                            <div className="audioplayer_control">
                                <NgIf cond={this.state.isPlaying === false}>
                                    <span onClick={this.onPlay.bind(this)}>
                                        <Icon name="play"/>
                                    </span>
                                </NgIf>
                                <NgIf cond={this.state.isPlaying === true}>
                                    <span onClick={this.onPause.bind(this)}>
                                        <Icon name="pause"/>
                                    </span>
                                </NgIf>
                            </div>
                            <div id="waveform"></div>
                        </div>
                    </NgIf>
                </div>
            </div>
        );
    }
}