// @flow strict

import * as React from 'react';

import classify from '../../utils/classify';
import {Dropdown} from '../Dropdown';
import type {IconType} from '../Icon';
import type {InputOnChangeParamsType} from '../Input';
import {Input} from '../Input';
import type {MenuOption, MenuProps} from '../Menu';
import {BodySmall, FormLabelSmall} from '../Text';

import css from './Combobox.module.css';


type InputClassNames = $ReadOnly<{
  box?: string,
  iconLeft?: string,
  iconRight?: string,
  wrapper?: string,
}>;

type DropdownClassNames = $ReadOnly<{
  wrapper?: string,
  box?: string,
  iconRight?: string,
}>;

type ClassNames = $ReadOnly<{
  wrapper?: string,
  box?: string,
  input?: InputClassNames,
  dropdown?: DropdownClassNames,
}>;

export type ComboboxProps = {
  /* Combobox props */
  classNames?: ClassNames,
  disabled?: boolean,
  type?: 'text' | 'tel',
  label?: string | React.Node,
  size?: 'medium' | 'small',
  onContainerClick?: ?(SyntheticEvent<HTMLElement>) => mixed,
  locked?: boolean,
  error?: boolean,
  errorText?: string,
  helperText?: string | React.Node,
  required?: boolean,
  readOnly?: boolean,
  boxRef?: (?HTMLElement) => mixed,
  value: {dropdown?: string, input?: string},
  onChange: ({
    input: string,
    dropdown: string,
    inputChange?: InputOnChangeParamsType,
    dropdownOption?: MenuOption,
  }) => mixed,

  /* Input props */
  inputPlaceholder?: string,
  onInputFocus?: (e: SyntheticInputEvent<HTMLInputElement>) => mixed,
  onInputBlur?: (e: SyntheticInputEvent<HTMLInputElement>) => mixed,
  onInputKeyDown?: (e: SyntheticKeyboardEvent<HTMLInputElement>) => mixed,
  onInputContainerClick?: ?(SyntheticEvent<HTMLElement>) => mixed,
  inputName?: string,
  iconLeftName?: string,
  iconLeftType?: IconType,
  iconRightName?: string,
  iconRightType?: IconType,
  onIconRightClick?: ?(SyntheticEvent<HTMLElement>) => mixed,
  inputBoxRef?: (?HTMLElement) => mixed,
  minLength?: string,
  maxLength?: string,
  pattern?: string,
  min?: string,
  max?: string,

  /* Dropdown props */
  menu?: MenuProps,
  onMenuOpen?: () => mixed,
  onMenuClose?: () => mixed,
  scrollMenuToBottom?: boolean,
  onDropdownFocus?: (e: SyntheticInputEvent<HTMLInputElement>) => mixed,
  onDropdownBlur?: (e: SyntheticInputEvent<HTMLInputElement>) => mixed,
  onDropdownKeyDown?: (e: SyntheticKeyboardEvent<HTMLInputElement>) => mixed,
  onDropdownContainerClick?: ?(SyntheticEvent<HTMLElement>) => mixed,
  dropdownName?: string,
  dropdownPlaceholder?: string,
  dropdownBoxRef?: (?HTMLElement) => mixed,
  ...
};

export const Combobox: React$AbstractComponent<ComboboxProps, HTMLDivElement> =
  React.forwardRef<ComboboxProps, HTMLDivElement>(
    (props: ComboboxProps, ref) => {
      const {
        value,
        onChange,
        classNames,
        disabled,
        type = 'text',
        label,
        inputPlaceholder,
        size = 'medium',
        onContainerClick,
        onInputFocus,
        onInputBlur,
        onInputKeyDown,
        onInputContainerClick,
        inputName,
        locked,
        error,
        errorText,
        helperText,
        required,
        iconLeftName,
        iconLeftType,
        iconRightName,
        iconRightType,
        onIconRightClick,
        readOnly,
        boxRef,
        inputBoxRef,
        minLength,
        maxLength,
        pattern,
        min,
        max,
        menu,
        onMenuOpen,
        onMenuClose,
        scrollMenuToBottom,
        onDropdownFocus,
        onDropdownBlur,
        onDropdownKeyDown,
        onDropdownContainerClick,
        dropdownName,
        dropdownPlaceholder,
        dropdownBoxRef,
      } = props;

      const inputRef = React.useRef();
      const dropdownRef = React.useRef();

      const {input: inputValue, dropdown: dropdownInputText} = value;

      const handleInputChange = (evt, isEnter) => {
        onChange({
          dropdown: dropdownInputText || '',
          input: evt.target.value,
          inputChange: {evt, isEnter},
        });
      };

      const handleDropdownChange = (option) => {
        onChange({
          dropdown: option.label || '',
          input: inputValue || '',
          dropdownOption: option,
        });
      };

      /* Handling locked functionality at Combobox level */
      React.useEffect(() => {
        if (locked) {
          inputRef.current && (inputRef.current.disabled = true);
          dropdownRef.current && (dropdownRef.current.disabled = true);
        } else {
          inputRef.current && (inputRef.current.disabled = false);
          dropdownRef.current && (dropdownRef.current.disabled = false);
        }
      }, [locked]);

      return (
        <div ref={ref} className={classify(css.wrapper, classNames?.wrapper)}>
          {Boolean(label) && (
            <div className={css.info}>
              <div className={css.infoContent}>
                <FormLabelSmall color="secondary">{label ?? ''}</FormLabelSmall>
                &nbsp;
                {required && <FormLabelSmall color="danger">*</FormLabelSmall>}
              </div>
            </div>
          )}
          <div
            className={classify(
              css.box,
              {
                [css.withError]: error ?? false,
              },
              classNames?.box,
            )}
            onClick={!(disabled || locked) ? onContainerClick : null}
            ref={boxRef}
          >
            <Dropdown
              ref={dropdownRef}
              menu={menu}
              boxRef={dropdownBoxRef}
              placeholder={dropdownPlaceholder}
              readOnly={readOnly}
              classNames={{
                wrapper: classify(
                  css.dropdownWrapper,
                  classNames?.dropdown?.wrapper,
                ),
                box: classify(
                  css.dropdownBox,
                  {
                    [css.disabled]: disabled ?? null,
                    [css.locked]: locked ?? null,
                  },
                  classNames?.dropdown?.box,
                ),
                iconRight: css.chevron,
              }}
              disabled={disabled}
              size={size}
              onMenuOpen={onMenuOpen}
              onMenuClose={onMenuClose}
              onChange={handleDropdownChange}
              scrollMenuToBottom={scrollMenuToBottom}
              dropdownInputText={dropdownInputText}
              onFocus={onDropdownFocus}
              onBlur={onDropdownBlur}
              onKeyDown={onDropdownKeyDown}
              onContainerClick={onDropdownContainerClick}
              name={dropdownName}
            />
            <Input
              ref={inputRef}
              boxRef={inputBoxRef}
              name={inputName}
              placeholder={inputPlaceholder}
              onFocus={onInputFocus}
              onBlur={onInputBlur}
              onChange={handleInputChange}
              onKeyDown={onInputKeyDown}
              onContainerClick={onInputContainerClick}
              value={inputValue}
              type={type}
              error={error}
              disabled={disabled}
              readOnly={readOnly}
              classNames={{
                wrapper: classify(css.inputWrapper, classNames?.input?.wrapper),
                box: classify(
                  css.inputBox,
                  {
                    [css.disabled]: disabled ?? null,
                    [css.locked]: locked ?? null,
                  },
                  classNames?.input?.box,
                ),
                iconLeft: classNames?.input?.iconLeft,
                iconRight: classNames?.input?.iconRight,
              }}
              size={size}
              iconLeftName={iconLeftName}
              iconLeftType={iconLeftType}
              iconRightName={iconRightName}
              iconRightType={iconRightType}
              onIconRightClick={onIconRightClick}
              minLength={minLength}
              maxLength={maxLength}
              pattern={pattern}
              min={min}
              max={max}
            />
          </div>
          {(Boolean(helperText) || error) && (
            <div className={css.info}>
              {error && errorText ? (
                <BodySmall color="danger">{errorText}</BodySmall>
              ) : typeof helperText === 'string' ? (
                <BodySmall color={disabled ? 'disabled' : 'secondary'}>
                  {helperText}
                </BodySmall>
              ) : (
                helperText
              )}
            </div>
          )}
        </div>
      );
    },
  );