// Type definitions for react-motion
// Project: https://github.com/chenglou/react-motion
// Definitions by: Stepan Mikhaylyuk <https://github.com/stepancar>
//                 Alexey Svetliakov <https://github.com/asvetliakov>
//                 Dimitar Nestorov <https://github.com/dimitarnestorov>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
// TypeScript Version: 2.8

import { Component } from 'react';

// your typical style object given in props. Maps to a number or a spring config
export type Style = { [key: string]: number | OpaqueConfig };
// the interpolating style object, with the same keys as the above Style object,
// with the values mapped to numbers, naturally
export type PlainStyle = { [key: string]: number };
// internal velocity object. Similar to PlainStyle, but whose numbers represent
// speed. Might be exposed one day.
export type Velocity = { [key: string]: number };

/**
 * Spring additional configuration
 */
interface SpringHelperConfig {
  /**
   * Specified stiffness
   * @defaults 170
   */
  stiffness?: number | undefined;
  /**
   * Specifies damping
   * @defaults 26
   */
  damping?: number | undefined;
  /**
   * Specifies both the rounding of the interpolated value and the speed (internal).
   * @defaults 0.01
   */
  precision?: number | undefined;
}

export interface OpaqueConfig {
  val: number;
  stiffness: number;
  damping: number;
  precision: number;
}

/**
 * <Motion/> properties
 */
interface MotionProps {
  /**
   * The default style. Being ignored on subsequent renders
   * @default Object with same keys as in style whose values are the initial numbers you're interpolating on
   */
  defaultStyle?: PlainStyle | undefined;
  /**
   * Object that maps to either number or opaque config returned by spring().
   * Must keep same keys throughout component's existence
   */
  style: Style;
  /**
   * Callback with your interpolated styles. Must return one react element to render
   * @param interpolatedStyle
   */
  children?: ((interpolatedStyle: PlainStyle) => JSX.Element) | undefined;
  /**
   * The callback that fires when the animation comes to a rest.
   */
  onRest?: (() => void) | undefined;
}

export declare class Motion extends Component<MotionProps> {}

// === TransitionMotion ===
interface TransitionStyle {
  /**
   * The ID that TransitionMotion uses to track which configuration is which across renders, even when things are reordered.
   * Typically reused as the component key when you map over the interpolated styles.
   */
  key: string;
  /**
   * Anything you'd like to carry along. Will be preserved on re-renders until key off
   */
  data?: any;
  /**
   * Actual starting style configuration
   */
  style: Style; // actual style you're passing
}
/**
 * Default style for transition
 */
interface TransitionPlainStyle {
  key: string;
  data?: any;
  // same as TransitionStyle, passed as argument to style/children function
  style: PlainStyle;
}
type InterpolateFunction = (
  previousInterpolatedStyles?: Array<TransitionPlainStyle>,
) => Array<TransitionStyle>;
/**
 * Transition properties
 */
interface TransitionProps {
  /**
   * Default styles on first render
   */
  defaultStyles?: Array<TransitionPlainStyle> | undefined;
  /**
   * Styles to interpolate. Accepts array of TransitionStyle objects or interpolated function similar as for
   * <StaggeredMotion/>
   */
  styles: Array<TransitionStyle> | InterpolateFunction;
  children?:
    | ((interpolatedStyles: Array<TransitionPlainStyle>) => JSX.Element)
    | undefined;
  /**
   * Triggers when a new element will appear
   * @param styleThatEntered
   */
  willEnter?: ((styleThatEntered: TransitionStyle) => PlainStyle) | undefined;
  /**
   * Triggers when an element will disappear
   * @param styleThatLeft
   */
  willLeave?: ((styleThatLeft: TransitionStyle) => Style | void) | undefined;
  /**
   * Triggers when an element has disappeared
   * @param styleThatLeft
   */
  didLeave?: ((styleThatLeft: TransitionStyle) => void) | undefined;
}
export class TransitionMotion extends Component<TransitionProps> {}

interface StaggeredMotionProps {
  children: (interpolatedStyles: any) => React.ReactElement;
  /**
   * Default styles
   */
  defaultStyles?: Array<PlainStyle> | undefined;
  /**
   * Styles to interpolate
   * @param previousInterpolatedStyles The previously interpolating (array of) styles (undefined at first render, unless defaultStyles is provided).
   */
  styles: (previousInterpolatedStyles?: Array<PlainStyle>) => Array<Style>;
}
export declare class StaggeredMotion extends Component<StaggeredMotionProps> {}

/**
 * Used in conjunction with the components below. Specifies the how to animate to the destination value, e.g. spring(10, {stiffness: 120, damping: 17}) means "animate to value 10, with a spring of stiffness 120 and damping 17".
 */
export declare function spring(
  val: number,
  config?: SpringHelperConfig,
): OpaqueConfig;

export declare class Presets {
  noWobble: OpaqueConfig; // the default, if nothing provided
  gentle: OpaqueConfig;
  wobbly: OpaqueConfig;
  stiff: OpaqueConfig;
}

export declare const presets: Presets;