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import { invariant } from '@react-dnd/invariant';
import { isPlainObject } from '../utils/js_utils';
import { getDecoratedComponent } from './utils';
const ALLOWED_SPEC_METHODS = ['canDrop', 'hover', 'drop'];
class TargetImpl {
constructor(spec, monitor, ref) {
this.props = null;
this.spec = spec;
this.monitor = monitor;
this.ref = ref;
}
receiveProps(props) {
this.props = props;
}
receiveMonitor(monitor) {
this.monitor = monitor;
}
canDrop() {
if (!this.spec.canDrop) {
return true;
}
return this.spec.canDrop(this.props, this.monitor);
}
hover() {
if (!this.spec.hover || !this.props) {
return;
}
this.spec.hover(this.props, this.monitor, getDecoratedComponent(this.ref));
}
drop() {
if (!this.spec.drop) {
return undefined;
}
const dropResult = this.spec.drop(this.props, this.monitor, this.ref.current);
if (process.env.NODE_ENV !== 'production') {
invariant(typeof dropResult === 'undefined' || isPlainObject(dropResult), 'drop() must either return undefined, or an object that represents the drop result. ' +
'Instead received %s. ' +
'Read more: http://react-dnd.github.io/react-dnd/docs/api/drop-target', dropResult);
}
return dropResult;
}
}
export function createTargetFactory(spec) {
Object.keys(spec).forEach((key) => {
invariant(ALLOWED_SPEC_METHODS.indexOf(key) > -1, 'Expected the drop target specification to only have ' +
'some of the following keys: %s. ' +
'Instead received a specification with an unexpected "%s" key. ' +
'Read more: http://react-dnd.github.io/react-dnd/docs/api/drop-target', ALLOWED_SPEC_METHODS.join(', '), key);
invariant(typeof spec[key] === 'function', 'Expected %s in the drop target specification to be a function. ' +
'Instead received a specification with %s: %s. ' +
'Read more: http://react-dnd.github.io/react-dnd/docs/api/drop-target', key, key, spec[key]);
});
return function createTarget(monitor, ref) {
return new TargetImpl(spec, monitor, ref);
};
}