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import { isNumber, noop } from 'lodash';
import React, { Fragment, PureComponent, ReactChild, ReactNode } from 'react';
import { Popover, PopoverList, PopoverListItem } from '../popover';
import AutocompleteItem from './autocomplete-item';
export interface AutocompleteProps {
initialValue?: string;
initialHighlightedIndex?: number;
children?: ReactNode;
items: AutocompleteItem[];
inputProps?: any;
listTestId?: string;
onToggleOpen?(state: { inputValue: string; isOpen: boolean }): void;
onSelect?(item: AutocompleteItem): void;
onChange?(value: string, isOpen: boolean): void;
}
class Autocomplete extends PureComponent<AutocompleteProps> {
render(): ReactNode {
const {
inputProps,
initialValue,
initialHighlightedIndex,
items,
children,
onSelect,
listTestId,
} = this.props;
return (
<Downshift
defaultHighlightedIndex={ 0 }
initialHighlightedIndex={ initialHighlightedIndex }
initialInputValue={ initialValue }
itemToString={ this.itemToString }
onChange={ onSelect }
onStateChange={ this.handleStateChange }
stateReducer={ this.stateReducer }
>
{ ({
isOpen,
getInputProps,
getMenuProps,
getItemProps,
highlightedIndex,
}) => (
<div>
<input
{ ...getInputProps() }
{ ...inputProps }
/>
{ isOpen && !!items.length &&
<Popover>
<PopoverList
getItemProps={ getItemProps }
highlightedIndex={ isNumber(highlightedIndex) ? highlightedIndex : -1 }
items={ items.map(item => this.toPopoverItem(item)) }
menuProps={ getMenuProps() }
testId={ listTestId }
/>
{ children }
</Popover> }
</div>
) }
</Downshift>
);
}
private toPopoverItem(item: AutocompleteItem): PopoverListItem {
return {
...item,
content: this.highlightItem(item),
};
}
private highlightItem(item: AutocompleteItem): ReactChild[] | ReactChild {
if (!item.highlightedSlices || !item.highlightedSlices.length) {
return item.label;
}
let lastIndex: number = 0;
let key = 0;
return item.highlightedSlices.reduce((node, slice, i) => {
const { label } = item;
const { offset, length } = slice;
const notHighlightedLength = offset - lastIndex;
Iif (notHighlightedLength) {
node.push(<Fragment key={ key }>
{ label.substr(lastIndex, notHighlightedLength) }
</Fragment>);
key += 1;
}
lastIndex = offset + length;
node.push(<strong key={ key }>{ label.substr(offset, length) }</strong>);
key += 1;
Eif (i === (item.highlightedSlices || []).length - 1) {
node.push(<Fragment key={ key }>
{ label.substr(lastIndex) }
</Fragment>);
key += 1;
}
return node;
}, [] as ReactChild[]);
}
private itemToString(item?: AutocompleteItem): string {
return item && item.value || '';
}
private stateReducer: (
state: DownshiftState<AutocompleteItem>,
changes: StateChangeOptions<AutocompleteItem>
) => Partial<StateChangeOptions<AutocompleteItem>> = (state, changes) => {
const { onChange } = this.props;
switch (changes.type) {
case Downshift.stateChangeTypes.blurInput:
case Downshift.stateChangeTypes.blurButton:
case Downshift.stateChangeTypes.mouseUp:
case Downshift.stateChangeTypes.touchEnd:
return {
...changes,
inputValue: state.inputValue,
};
case Downshift.stateChangeTypes.changeInput:
if (changes.inputValue !== state.inputValue && onChange) {
onChange(changes.inputValue || '', state.isOpen);
}
return changes;
case Downshift.stateChangeTypes.keyDownEnter:
return changes;
default:
return changes;
}
};
private handleStateChange = ({ isOpen, inputValue }: StateChangeOptions<string>) => {
const { onToggleOpen = noop } = this.props;
if (isOpen !== undefined) {
onToggleOpen({ isOpen, inputValue: inputValue || '' });
}
};
}
export default Autocomplete;
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