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import React from 'react';
import PropTypes from 'prop-types';
const emptyComponent = () => null;
const noop = () => { };
class Bundle extends React.Component {
static propTypes = {
fetchComponent: PropTypes.func.isRequired,
loading: PropTypes.func,
error: PropTypes.func,
children: PropTypes.func.isRequired,
renderDelay: PropTypes.number,
onFetch: PropTypes.func,
onFetchSuccess: PropTypes.func,
onFetchFail: PropTypes.func,
};
static defaultProps = {
loading: emptyComponent,
error: emptyComponent,
renderDelay: 0,
onFetch: noop,
onFetchSuccess: noop,
onFetchFail: noop,
};
static cache = {};
state = {
mod: undefined,
forceRender: false,
};
componentWillMount() {
this.load(this.props);
}
componentWillReceiveProps(nextProps) {
if (nextProps.fetchComponent !== this.props.fetchComponent) {
this.load(nextProps);
}
}
componentWillUnmount () {
if (this.timeout) {
clearTimeout(this.timeout);
}
}
load = (props) => {
const { fetchComponent, onFetch, onFetchSuccess, onFetchFail, renderDelay } = props || this.props;
if (fetchComponent === undefined) {
this.setState({ mod: null });
return Promise.resolve();
}
onFetch();
if (Bundle.cache[fetchComponent.name]) {
const mod = Bundle.cache[fetchComponent.name];
this.setState({ mod: mod.default });
onFetchSuccess();
return Promise.resolve();
}
this.setState({ mod: undefined });
if (renderDelay !== 0) {
this.timestamp = new Date();
this.timeout = setTimeout(() => this.setState({ forceRender: true }), renderDelay);
}
return fetchComponent()
.then((mod) => {
Bundle.cache[fetchComponent.name] = mod;
this.setState({ mod: mod.default });
onFetchSuccess();
})
.catch((error) => {
this.setState({ mod: null });
onFetchFail(error);
});
};
render() {
const { loading: Loading, error: Error, children, renderDelay } = this.props;
const { mod, forceRender } = this.state;
const elapsed = this.timestamp ? (new Date() - this.timestamp) : renderDelay;
if (mod === undefined) {
return (elapsed >= renderDelay || forceRender) ? <Loading /> : null;
}
if (mod === null) {
return <Error onRetry={this.load} />;
}
return children(mod);
}
}
export default Bundle;
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