/**
 * @module "ui/animation"
 */ /** */

import { View, Color } from "../core/view";

/**
 * Defines animation options for the View.animate method.
 */
export interface AnimationDefinition {
    /**
     * The view whose property is to be animated.
     */
    target?: View;

    /**
     * Animates the opacity of the view. Value should be a number between 0.0 and 1.0
     */
    opacity?: number;

    /**
     * Animates the backgroundColor of the view.
     */
    backgroundColor?: Color;

    /**
     * Animates the translate affine transform of the view.
     */
    translate?: Pair;

    /**
     * Animates the scale affine transform of the view.
     */
    scale?: Pair;

    /**
     * Animates the rotate affine transform of the view. Value should be a number specifying the rotation amount in degrees.
     */
    rotate?: number;

    /**
     * The length of the animation in milliseconds. The default duration is 300 milliseconds.
     */
    duration?: number;

    /**
     * The amount of time, in milliseconds, to delay starting the animation.
     */
    delay?: number;

    /**
     * Specifies how many times the animation should be played. Default is 1.
     * iOS animations support fractional iterations, i.e. 1.5.
     * To repeat an animation infinitely, use Number.POSITIVE_INFINITY
     */
    iterations?: number;

    /**
     * An optional animation curve. Possible values are contained in the [AnimationCurve enumeration](../modules/_ui_enums_.animationcurve.html).
     * Alternatively, you can pass an instance of type UIViewAnimationCurve for iOS or android.animation.TimeInterpolator for Android.
     */
    curve?: any;
}

/**
 * Defines a custom animation timing curve by using the cubic-bezier function.
 * Possible values are numeric values from 0 to 1
 */
export class CubicBezierAnimationCurve {
    public x1: number;
    public y1: number;
    public x2: number;
    public y2: number;

    constructor(x1: number, y1: number, x2: number, y2: number);
}

/**
 * Defines a key-value pair for css transformation
 */
export type Transformation = {
    property: TransformationType;
    value: TransformationValue;
};

/**
 * Defines possible css transformations
 */
export type TransformationType = "rotate" |
    "translate" | "translateX" | "translateY" |
    "scale" | "scaleX" | "scaleY";

/**
 * Defines possible css transformation values
 */
export type TransformationValue = Pair | number;

/**
 * Defines a pair of values (horizontal and vertical) for translate and scale animations.
 */
export interface Pair {
    x: number;
    y: number;
}

/**
 * Defines full information for css transformation
 */
export type TransformFunctionsInfo = {
    translate: Pair,
    rotate: number,
    scale: Pair,
}

export interface Cancelable {
    cancel(): void;
}

/**
 * A Promise that can cancel the animation.
 */
export type AnimationPromise = Promise<void> & Cancelable;

/**
 * Defines a animation set.
 */
export class Animation {
    constructor(animationDefinitions: Array<AnimationDefinition>, playSequentially?: boolean);
    public play: () => AnimationPromise;
    public cancel: () => void;
    public isPlaying: boolean;
    public _resolveAnimationCurve(curve: any): any;
}

export function _resolveAnimationCurve(curve: any): any;
