/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 *
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import React, {
  ButtonHTMLAttributes,
  FunctionComponent,
  HTMLAttributes,
  Ref,
} from 'react';
import classNames from 'classnames';

import { CommonProps, keysOf, ExclusiveUnion } from '../common';

export const panelPaddingValues = {
  none: 0,
  s: 8,
  m: 16,
  l: 24,
};

const paddingSizeToClassNameMap = {
  none: null,
  s: 'ouiPanel--paddingSmall',
  m: 'ouiPanel--paddingMedium',
  l: 'ouiPanel--paddingLarge',
};

export const SIZES = keysOf(paddingSizeToClassNameMap);

const borderRadiusToClassNameMap = {
  none: 'ouiPanel--borderRadiusNone',
  m: 'ouiPanel--borderRadiusMedium',
};

export const BORDER_RADII = keysOf(borderRadiusToClassNameMap);

export const COLORS = [
  'transparent',
  'plain',
  'subdued',
  'accent',
  'primary',
  'success',
  'warning',
  'danger',
] as const;

export type PanelColor = typeof COLORS[number];
export type PanelPaddingSize = typeof SIZES[number];
export type PanelBorderRadius = typeof BORDER_RADII[number];

export interface _OuiPanelProps extends CommonProps {
  /**
   * Adds a medium shadow to the panel;
   * Only works when `color="plain"`
   */
  hasShadow?: boolean;
  /**
   * Adds a slight 1px border on all edges.
   * Only works when `color="plain | transparent"`
   * Default is `undefined` and will default to that theme's panel style
   */
  hasBorder?: boolean;
  /**
   * Padding for all four sides
   */
  paddingSize?: PanelPaddingSize;
  /**
   * Corner border radius
   */
  borderRadius?: PanelBorderRadius;
  /**
   * When true the panel will grow in height to match `OuiFlexItem`
   */
  grow?: boolean;
  panelRef?: Ref<HTMLDivElement>;
  /**
   * Background color of the panel;
   * Usually a lightened form of the brand colors
   */
  color?: PanelColor;
}

export interface _OuiPanelDivlike
  extends _OuiPanelProps,
    Omit<HTMLAttributes<HTMLDivElement>, 'color'> {
  element?: 'div';
}

export interface _OuiPanelButtonlike
  extends _OuiPanelProps,
    Omit<ButtonHTMLAttributes<HTMLButtonElement>, 'color'> {
  element?: 'button';
}

export type OuiPanelProps = ExclusiveUnion<
  _OuiPanelButtonlike,
  _OuiPanelDivlike
>;

export const OuiPanel: FunctionComponent<OuiPanelProps> = ({
  children,
  className,
  paddingSize = 'm',
  borderRadius = 'm',
  color = 'plain',
  hasShadow = true,
  hasBorder,
  grow = true,
  panelRef,
  element,
  ...rest
}) => {
  // Shadows are only allowed when there's a white background (plain)
  const canHaveShadow = color === 'plain';
  const canHaveBorder = color === 'plain' || color === 'transparent';

  const classes = classNames(
    'ouiPanel',
    paddingSizeToClassNameMap[paddingSize],
    borderRadiusToClassNameMap[borderRadius],
    `ouiPanel--${color}`,
    {
      /* ToDo: Remove unnecessary logic: the old beta theme has
       * evolved and the statement below about the `Next` theme
       * is not valid.
       */
      // The `no` classes turn off the option for default theme
      // While the `has` classes turn it on for Next
      'ouiPanel--hasShadow': canHaveShadow && hasShadow === true,
      'ouiPanel--noShadow': !canHaveShadow || hasShadow === false,
      'ouiPanel--hasBorder': canHaveBorder && hasBorder === true,
      'ouiPanel--noBorder': !canHaveBorder || hasBorder === false,
      'ouiPanel--flexGrowZero': !grow,
      'ouiPanel--isClickable': rest.onClick,
    },
    className
  );

  if (rest.onClick && element !== 'div') {
    return (
      <button
        ref={panelRef as Ref<HTMLButtonElement>}
        className={classes}
        {...(rest as ButtonHTMLAttributes<HTMLButtonElement>)}>
        {children}
      </button>
    );
  }

  return (
    <div
      ref={panelRef as Ref<HTMLDivElement>}
      className={classes}
      {...(rest as HTMLAttributes<HTMLDivElement>)}>
      {children}
    </div>
  );
};
