import type { FC } from 'react';
import React, { useCallback, useEffect, useState } from 'react';
import type { IUserGroupHasId } from '@growi/core';
import { format as dateFnsFormat } from 'date-fns/format';
import { useTranslation } from 'next-i18next';

type Props = {
  userGroup: IUserGroupHasId;
  parentUserGroup?: IUserGroupHasId;
  selectableParentUserGroups?: IUserGroupHasId[];
  submitButtonLabel: string;
  onSubmit: (
    targetGroup: IUserGroupHasId,
    userGroupData: Partial<IUserGroupHasId>,
  ) => Promise<void>;
  isExternalGroup?: boolean;
};

export const UserGroupForm: FC<Props> = (props: Props) => {
  const { t } = useTranslation('admin');

  const {
    userGroup,
    parentUserGroup,
    selectableParentUserGroups,
    submitButtonLabel,
    onSubmit,
    isExternalGroup = false,
  } = props;
  /*
   * State
   */
  const [currentName, setName] = useState<string>(userGroup.name);
  const [currentDescription, setDescription] = useState<string>(
    userGroup.description,
  );
  const [selectedParent, setSelectedParent] = useState<
    IUserGroupHasId | undefined
  >();
  /*
   * Function
   */
  const onChangeNameHandler = useCallback((e) => {
    setName(e.target.value);
  }, []);

  const onChangeDescriptionHandler = useCallback((e) => {
    setDescription(e.target.value);
  }, []);

  const onChangeParentButtonHandler = useCallback(
    (userGroup: IUserGroupHasId) => {
      if (userGroup._id !== selectedParent?._id) {
        setSelectedParent(userGroup);
      }
    },
    [selectedParent],
  );

  useEffect(() => {
    setSelectedParent(parentUserGroup);
  }, [parentUserGroup]);

  const isSelectableParentUserGroups =
    selectableParentUserGroups != null && selectableParentUserGroups.length > 0;

  const isChildUserGroup = parentUserGroup !== undefined;
  const messageAtReleaseParentGroup = isChildUserGroup
    ? t('user_group_management.release_parent_group')
    : t('user_group_management.select_parent_group');

  return (
    <form
      onSubmit={(e) => {
        e.preventDefault();
        onSubmit(props.userGroup, {
          name: currentName,
          description: currentDescription,
          parent: selectedParent,
        });
      }}
    >
      <fieldset>
        <h2 className="admin-setting-header">
          {t('user_group_management.basic_info')}
        </h2>
        {isExternalGroup && (
          <div className="mb-3">
            <small className="text-muted">
              {t('external_user_group.only_description_edit_allowed')}
            </small>
          </div>
        )}
        {userGroup?.createdAt != null && (
          <div className="row mb-3">
            <p className="col-md-2 col-form-label">{t('Created')}</p>
            <p className="col-md-6 my-auto">
              {dateFnsFormat(userGroup.createdAt, 'yyyy-MM-dd')}
            </p>
          </div>
        )}

        <div className="row mb-3">
          <label htmlFor="name" className="col-md-2 col-form-label">
            {t('user_group_management.group_name')}
          </label>
          <div className="col-md-6 my-auto">
            <input
              className="form-control"
              type="text"
              name="name"
              placeholder={t('user_group_management.group_example')}
              value={currentName}
              onChange={onChangeNameHandler}
              required
              disabled={isExternalGroup}
            />
          </div>
        </div>

        <div className="row mb-3">
          <label htmlFor="description" className="col-md-2 col-form-label">
            {t('Description')}
          </label>
          <div className="col-md-6">
            <textarea
              className="form-control"
              name="description"
              value={currentDescription}
              onChange={onChangeDescriptionHandler}
            />
          </div>
        </div>

        <div className="row mb-3">
          <label htmlFor="parent" className="col-md-2 col-form-label">
            {t('user_group_management.parent_group')}
          </label>
          <div className="dropdown col-md-6">
            <button
              type="button"
              id="dropdownMenuButton"
              data-bs-toggle="dropdown"
              className="btn btn-outline-secondary dropdown-toggle mb-3"
              disabled={isExternalGroup || !isSelectableParentUserGroups}
            >
              {selectedParent?.name ?? messageAtReleaseParentGroup}
            </button>
            <div className="dropdown-menu">
              {isSelectableParentUserGroups && (
                <>
                  {selectableParentUserGroups.map((userGroup) => (
                    <button
                      key={userGroup._id}
                      type="button"
                      className={`dropdown-item ${selectedParent?._id === userGroup._id ? 'active' : ''}`}
                      onClick={() => onChangeParentButtonHandler(userGroup)}
                    >
                      {userGroup.name}
                    </button>
                  ))}
                </>
              )}

              <div className="dropdown-divider" />

              <button
                className="dropdown-item"
                type="button"
                onClick={() => {
                  setSelectedParent(undefined);
                }}
              >
                {t('user_group_management.release_parent_group')}
              </button>
            </div>
          </div>
        </div>

        <div className="row mb-5">
          <div className="offset-md-2 col-md-10">
            <button type="submit" className="btn btn-primary">
              {submitButtonLabel}
            </button>
          </div>
        </div>
      </fieldset>
    </form>
  );
};