/*
 * Copyright 2020 Adobe. All rights reserved.
 * This file is licensed 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 REPRESENTATIONS
 * OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

import {FocusableElement} from './dom';
import {
  FocusEvent,
  MouseEvent,
  KeyboardEvent as ReactKeyboardEvent,
  SyntheticEvent
} from 'react';

// Event bubbling can be problematic in real-world applications, so the default for React Spectrum components
// is not to propagate. This can be overridden by calling continuePropagation() on the event.
export type BaseEvent<T extends SyntheticEvent> = T & {
  /**
   * Use continuePropagation.
   * @deprecated */
  stopPropagation(): void,
  continuePropagation(): void
}

export type KeyboardEvent = BaseEvent<ReactKeyboardEvent<any>>;

export type PointerType = 'mouse' | 'pen' | 'touch' | 'keyboard' | 'virtual';

export interface PressEvent {
  /** The type of press event being fired. */
  type: 'pressstart' | 'pressend' | 'pressup' | 'press',
  /** The pointer type that triggered the press event. */
  pointerType: PointerType,
  /** The target element of the press event. */
  target: Element,
  /** Whether the shift keyboard modifier was held during the press event. */
  shiftKey: boolean,
  /** Whether the ctrl keyboard modifier was held during the press event. */
  ctrlKey: boolean,
  /** Whether the meta keyboard modifier was held during the press event. */
  metaKey: boolean,
  /** Whether the alt keyboard modifier was held during the press event. */
  altKey: boolean,
  /** X position relative to the target. */
  x: number,
  /** Y position relative to the target. */
  y: number,
  /**
   * The key that triggered the press event, if it was triggered by a keyboard interaction.
   * This is useful for differentiating between Space and Enter key presses.
   */
  key?: string,
  /**
   * By default, press events stop propagation to parent elements.
   * In cases where a handler decides not to handle a specific event,
   * it can call `continuePropagation()` to allow a parent to handle it.
   */
  continuePropagation(): void
}

export interface LongPressEvent extends Omit<PressEvent, 'type' | 'continuePropagation'> {
  /** The type of long press event being fired. */
  type: 'longpressstart' | 'longpressend' | 'longpress'
}

export interface HoverEvent {
  /** The type of hover event being fired. */
  type: 'hoverstart' | 'hoverend',
  /** The pointer type that triggered the hover event. */
  pointerType: 'mouse' | 'pen',
  /** The target element of the hover event. */
  target: HTMLElement
}

export interface KeyboardEvents {
  /** Handler that is called when a key is pressed. */
  onKeyDown?: (e: KeyboardEvent) => void,
  /** Handler that is called when a key is released. */
  onKeyUp?: (e: KeyboardEvent) => void
}

export interface FocusEvents<Target = Element> {
  /** Handler that is called when the element receives focus. */
  onFocus?: (e: FocusEvent<Target>) => void,
  /** Handler that is called when the element loses focus. */
  onBlur?: (e: FocusEvent<Target>) => void,
  /** Handler that is called when the element's focus status changes. */
  onFocusChange?: (isFocused: boolean) => void
}

export interface HoverEvents {
  /** Handler that is called when a hover interaction starts. */
  onHoverStart?: (e: HoverEvent) => void,
  /** Handler that is called when a hover interaction ends. */
  onHoverEnd?: (e: HoverEvent) => void,
  /** Handler that is called when the hover state changes. */
  onHoverChange?: (isHovering: boolean) => void
}

export interface PressEvents {
  /** Handler that is called when the press is released over the target. */
  onPress?: (e: PressEvent) => void,
  /** Handler that is called when a press interaction starts. */
  onPressStart?: (e: PressEvent) => void,
  /**
   * Handler that is called when a press interaction ends, either
   * over the target or when the pointer leaves the target.
   */
  onPressEnd?: (e: PressEvent) => void,
  /** Handler that is called when the press state changes. */
  onPressChange?: (isPressed: boolean) => void,
  /**
   * Handler that is called when a press is released over the target, regardless of
   * whether it started on the target or not.
   */
  onPressUp?: (e: PressEvent) => void,
  /**
   * **Not recommended – use `onPress` instead.** `onClick` is an alias for `onPress`
   * provided for compatibility with other libraries. `onPress` provides 
   * additional event details for non-mouse interactions.
   */
  onClick?: (e: MouseEvent<FocusableElement>) => void
}

export interface FocusableProps<Target = Element> extends FocusEvents<Target>, KeyboardEvents {
  /** Whether the element should receive focus on render. */
  autoFocus?: boolean
}

interface BaseMoveEvent {
  /** The pointer type that triggered the move event. */
  pointerType: PointerType,
  /** Whether the shift keyboard modifier was held during the move event. */
  shiftKey: boolean,
  /** Whether the ctrl keyboard modifier was held during the move event. */
  ctrlKey: boolean,
  /** Whether the meta keyboard modifier was held during the move event. */
  metaKey: boolean,
  /** Whether the alt keyboard modifier was held during the move event. */
  altKey: boolean
}

export interface MoveStartEvent extends BaseMoveEvent {
  /** The type of move event being fired. */
  type: 'movestart'
}

export interface MoveMoveEvent extends BaseMoveEvent {
  /** The type of move event being fired. */
  type: 'move',
  /** The amount moved in the X direction since the last event. */
  deltaX: number,
  /** The amount moved in the Y direction since the last event. */
  deltaY: number

}

export interface MoveEndEvent extends BaseMoveEvent {
  /** The type of move event being fired. */
  type: 'moveend'
}

export type MoveEvent = MoveStartEvent | MoveMoveEvent | MoveEndEvent;

export interface MoveEvents {
  /** Handler that is called when a move interaction starts. */
  onMoveStart?: (e: MoveStartEvent) => void,
  /** Handler that is called when the element is moved. */
  onMove?: (e: MoveMoveEvent) => void,
  /** Handler that is called when a move interaction ends. */
  onMoveEnd?: (e: MoveEndEvent) => void
}

export interface ScrollEvent {
  /** The amount moved in the X direction since the last event. */
  deltaX: number,
  /** The amount moved in the Y direction since the last event. */
  deltaY: number
}

export interface ScrollEvents {
  /** Handler that is called when the scroll wheel moves. */
  onScroll?: (e: ScrollEvent) => void
}
