/**
 * This is a HoC that finds a single
 * <video> in a component and makes
 * all its PROPERTIES available as props.
 */
import React, { Component } from 'react';
import { findDOMNode } from 'react-dom';
import {
    EVENTS,
    PROPERTIES,
    TRACKEVENTS
} from './constants';

const defaultMapStateToProps = (state = {}) => Object.assign({
    video: {
        ...state
    }
});

const defaultMapVideoElToProps = (videoEl) => ({
    videoEl
});

const defaultMergeProps = (
    stateProps = {},
    videoElProps = {},
    ownProps = {}
) => Object.assign({}, stateProps, videoElProps, ownProps);

export default (
    BaseComponent,
    mapStateToProps = defaultMapStateToProps,
    mapVideoElToProps = defaultMapVideoElToProps,
    mergeProps = defaultMergeProps
) => class Video extends Component {
        constructor(props) {
            super(props);
            this.updateState = this.updateState.bind(this);
            this.state = {};
        }

        updateState() {
            this.setState(
                PROPERTIES.reduce((p, c) => {
                    p[c] = this.videoEl && this.videoEl[c];
                    if (c == 'playbackrates' && this.videoEl.dataset[c]) {
                        p[c] = this.videoEl && JSON.parse(this.videoEl.dataset[c]);
                    }
                    return p;
                }, {})
            );
        }

        bindEventsToUpdateState() {
            EVENTS.forEach(event => {
                this.videoEl.addEventListener(event.toLowerCase(), this.updateState);
            });

            TRACKEVENTS.forEach(event => {
                // TODO: JSDom does not have this method on
                // `textTracks`. Investigate so we can test this without this check.
                this.videoEl.textTracks.addEventListener
                && this.videoEl.textTracks.addEventListener(event.toLowerCase(), this.updateState);
            });

            // If <source> elements are used instead of a src attribute then
            // errors for unsupported format do not bubble up to the <video>.
            // Do this manually by listening to the last <source> error event
            // to force an update.
            // https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Using_HTML5_audio_and_video
            const sources = this.videoEl.getElementsByTagName('source');
            if (sources.length) {
                const lastSource = sources[sources.length - 1];
                lastSource.addEventListener('error', this.updateState);
            }
        }

        unbindEvents() {
            EVENTS.forEach(event => {
                this.videoEl.removeEventListener(event.toLowerCase(), this.updateState);
            });

            TRACKEVENTS.forEach(event => {
                // TODO: JSDom does not have this method on
                // `textTracks`. Investigate so we can test this without this check.
                this.videoEl.textTracks.removeEventListener
                && this.videoEl.textTracks.removeEventListener(event.toLowerCase(), this.updateState);
            });

            const sources = this.videoEl.getElementsByTagName('source');
            if (sources.length) {
                const lastSource = sources[sources.length - 1];
                lastSource.removeEventListener('error', this.updateState);
            }
        }

        componentWillUnmount() {
            this.unbindEvents();
        }

        // Stop `this.el` from being null briefly on every render,
        // see: https://github.com/mderrick/react-html5video/pull/65
        setRef(el) {
            this.el = findDOMNode(el);
        }

        componentDidMount() {
            this.videoEl = this.el.getElementsByTagName('video')[0];
            this.bindEventsToUpdateState();
        }

        render() {
            const stateProps = mapStateToProps(
                this.state,
                this.props
            );
            const videoElProps = mapVideoElToProps(
                this.videoEl,
                this.state,
                this.props
            );
            return (
                <div ref={this.setRef.bind(this)}>
                    <BaseComponent
                        {...mergeProps(
                            stateProps,
                            videoElProps,
                            this.props)} />
                </div>
            );
        }
    }