cunningham/packages/react/src/components/Forms/Select/multi.tsx

import React, { forwardRef, useEffect } from "react";
import { optionToValue } from ":/components/Forms/Select/mono-common";
import { SelectMultiSearchable } from ":/components/Forms/Select/multi-searchable";
import { SelectMultiSimple } from ":/components/Forms/Select/multi-simple";
import { SubProps } from ":/components/Forms/Select/multi-common";
import {
  Option,
  SelectHandle,
  SelectProps,
} from ":/components/Forms/Select/index";

export type SelectMultiProps = Omit<SelectProps, "onChange"> & {
  onChange?: (event: { target: { value: string[] } }) => void;
};

export const SelectMulti = forwardRef<SelectHandle, SelectMultiProps>(
  (props, ref) => {
    const getSelectedItemsFromProps = () => {
      const valueToUse = props.defaultValue ?? props.value ?? [];
      return props.options.filter((option) =>
        (valueToUse as string[]).includes(optionToValue(option)),
      );
    };

    const [selectedItems, setSelectedItems] = React.useState<Option[]>(
      getSelectedItemsFromProps(),
    );

    // If the component is used as a controlled component, we need to update the local value when the value prop changes.
    useEffect(() => {
      // Means it is not controlled.
      if (props.defaultValue !== undefined) {
        return;
      }
      setSelectedItems(getSelectedItemsFromProps());
    }, [JSON.stringify(props.value)]);

    // If the component is used as an uncontrolled component, we need to update the parent value when the local value changes.
    useEffect(() => {
      props.onChange?.({ target: { value: selectedItems.map(optionToValue) } });
    }, [JSON.stringify(selectedItems)]);

    const onSelectedItemsChange: SubProps["onSelectedItemsChange"] = (
      newSelectedItems,
    ) => {
      setSelectedItems(newSelectedItems);
      // props.onSelectedItemsChange?.(newSelectedItems);
    };

    return props.searchable ? (
      <SelectMultiSearchable
        {...props}
        selectedItems={selectedItems}
        onSelectedItemsChange={onSelectedItemsChange}
        ref={ref}
      />
    ) : (
      <SelectMultiSimple
        {...props}
        selectedItems={selectedItems}
        onSelectedItemsChange={onSelectedItemsChange}
        ref={ref}
      />
    );
  },
);