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useCallback,
useEffect,
useState,
type HTMLAttributes,
type ReactNode,
} from 'react';
import cn from 'classnames';
import type { Except } from 'type-fest';
import AutocompleteItem, {
type AutocompleteItemType,
} from './autocomplete-item';
import SearchInput from './search-input';
import { getLastIndexOfSubstringIgnoreCase } from '../utils';
import '../styles/components/dropdown.scss';
import '../styles/components/autocomplete.scss';
export const filterOptions = (items: AutocompleteItemType[], query: string) =>
items.filter(
(item) =>
getLastIndexOfSubstringIgnoreCase(item.pathLabel, query) >= 0 ||
item.tags?.some(
(tag) => getLastIndexOfSubstringIgnoreCase(tag, query) >= 0
)
);
export const shouldShowDropdown = (
textInputValue: string,
data: AutocompleteItemType[],
selected: boolean,
filter: boolean,
minCharsToShowDropdown: number
) => {
const trimmed = textInputValue.trim();
let showDropdown = false;
if (trimmed && !selected && trimmed.length >= minCharsToShowDropdown) {
const found = filter ? filterOptions(data, trimmed) : data;
showDropdown = found.length > 0;
}
return showDropdown;
};
type AutocompleteProps = {
data: AutocompleteItemType[];
onSelect: (selected: AutocompleteItemType | string) => void;
onChange?: (textInput: string) => void;
onDropdownChange?: (dropdownShown: boolean) => void;
clearOnSelect?: boolean;
placeholder?: string;
filter?: boolean;
value?: string;
minCharsToShowDropdown?: number;
isLoading?: boolean;
autoFocus?: boolean;
};
type Props = Except<
HTMLAttributes<HTMLDivElement>,
// Need to remove them because we use the same name as existing ones, but
// but with a different signature
'onSelect' | 'onChange'
> &
AutocompleteProps;
const Autocomplete = ({
data,
onSelect,
onChange,
onDropdownChange,
clearOnSelect = false,
placeholder = '',
filter = true,
value = '',
minCharsToShowDropdown = 0,
isLoading = false,
autoFocus = false,
className,
...props
}: Props) => {
const [textInputValue, setTextInputValue] = useState(value);
const [hoverIndex, setHoverIndex] = useState(-1);
const [selected, setSelected] = useState(false);
useEffect(() => {
setTextInputValue(value);
}, [value]);
useEffect(
() => () => {
// On unmount tell the parent that the dropdown menu isn't being shown anymore.
onDropdownChange?.(false);
},
[onDropdownChange]
);
const handleInputChange = useCallback(
(event: React.ChangeEvent<HTMLInputElement>) => {
const { value: textInputValue } = event.target;
const showDropdown = shouldShowDropdown(
textInputValue,
data,
false,
filter,
minCharsToShowDropdown
);
onDropdownChange?.(showDropdown);
setTextInputValue(textInputValue);
setSelected(false);
onChange?.(textInputValue);
Iif (showDropdown) {
setHoverIndex(0);
}
},
[data, filter, minCharsToShowDropdown, onChange, onDropdownChange]
);
const handleNodeSelect = useCallback(
(selected: AutocompleteItemType | string) => {
const textInputValue =
typeof selected === 'string' ? selected : selected?.pathLabel;
setTextInputValue(clearOnSelect ? '' : textInputValue);
setHoverIndex(-1);
setSelected(true);
onDropdownChange?.(false);
onSelect(selected);
},
[clearOnSelect, onSelect, onDropdownChange]
);
const handleOnKeyDown = useCallback(
(event: React.KeyboardEvent<HTMLInputElement>) => {
Iif (event.key === 'ArrowUp') {
event.preventDefault();
setHoverIndex(hoverIndex <= 0 ? -1 : hoverIndex - 1);
} else Iif (event.key === 'ArrowDown') {
event.preventDefault();
const options = filter ? filterOptions(data, textInputValue) : data;
setHoverIndex(Math.min(options.length - 1, hoverIndex + 1));
} else Iif (event.key === 'Escape') {
event.preventDefault();
setHoverIndex(-1);
setSelected(true);
} else Eif (event.key === 'Enter') {
event.preventDefault();
Iif (hoverIndex >= 0) {
const options = filter ? filterOptions(data, textInputValue) : data;
handleNodeSelect(options[hoverIndex]);
} else {
handleNodeSelect(textInputValue);
}
}
},
[data, filter, handleNodeSelect, hoverIndex, textInputValue]
);
const showDropdown = shouldShowDropdown(
textInputValue,
data,
selected,
filter,
minCharsToShowDropdown
);
let nodes: ReactNode[] = [];
Iif (showDropdown) {
nodes = (filter ? filterOptions(data, textInputValue) : data).map(
(item, index) => (
<AutocompleteItem
item={item}
active={hoverIndex === index}
substringToHighlight={textInputValue}
key={item.id}
handleOnClick={handleNodeSelect}
/>
)
);
}
return (
<div className={cn('autocomplete-container', className)} {...props}>
<SearchInput
value={textInputValue}
onChange={handleInputChange}
onKeyDown={handleOnKeyDown}
placeholder={placeholder}
isLoading={isLoading}
autoFocus={autoFocus}
/>
<div
className={cn('autocomplete-menu', {
'dropdown-menu-open': showDropdown,
})}
>
<div className="dropdown-menu__panel">
{nodes.length ? <ul>{nodes}</ul> : null}
</div>
</div>
</div>
);
};
export default Autocomplete;
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