// Copyright (C) 2024 The Android Open Source Project
//
// Licensed 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 m from 'mithril';

import {Button} from './button';
import {HTMLAttrs} from './common';

interface IconOption {
  // Icon buttons require an icon.
  readonly icon: string;
}

interface LabelOption {
  // Label buttons require a label.
  readonly label: string;
  // Label buttons can have an optional icon.
  readonly icon?: string;
}

type Option = LabelOption | IconOption;

export interface SegmentedButtonsAttrs extends HTMLAttrs {
  // Options for segmented buttons.
  readonly options: ReadonlyArray<Option>;

  // The index of the selected button.
  readonly selectedOption: number;

  // Callback function which is called every time a
  readonly onOptionSelected: (num: number) => void;

  // Whether the segmented buttons is disabled.
  // false by default.
  readonly disabled?: boolean;
}

export class SegmentedButtons
  implements m.ClassComponent<SegmentedButtonsAttrs>
{
  view({attrs}: m.CVnode<SegmentedButtonsAttrs>) {
    const {options, selectedOption, disabled, onOptionSelected, ...htmlAttrs} =
      attrs;
    return m(
      '.pf-segmented-buttons',
      htmlAttrs,
      options.map((o, i) =>
        m(Button, {
          ...o,
          disabled: disabled,
          active: i === selectedOption,
          onclick: () => onOptionSelected(i),
        }),
      ),
    );
  }
}