import { invariant, millisecondsToSeconds, secondsToMilliseconds, noop } from 'motion-utils';
import { setStyle } from '../render/dom/style-set.mjs';
import { supportsScrollTimeline } from '../utils/supports/scroll-timeline.mjs';
import { getFinalKeyframe } from './keyframes/get-final.mjs';
import { WithPromise } from './utils/WithPromise.mjs';
import { startWaapiAnimation } from './waapi/start-waapi-animation.mjs';
import { applyGeneratorOptions } from './waapi/utils/apply-generator.mjs';

/**
 * NativeAnimation implements AnimationPlaybackControls for the browser's Web Animations API.
 */
class NativeAnimation extends WithPromise {
    constructor(options) {
        super();
        this.finishedTime = null;
        this.isStopped = false;
        if (!options)
            return;
        const { element, name, keyframes, pseudoElement, allowFlatten = false, finalKeyframe, onComplete, } = options;
        this.isPseudoElement = Boolean(pseudoElement);
        this.allowFlatten = allowFlatten;
        this.options = options;
        invariant(typeof options.type !== "string", `Mini animate() doesn't support "type" as a string.`, "mini-spring");
        const transition = applyGeneratorOptions(options);
        this.animation = startWaapiAnimation(element, name, keyframes, transition, pseudoElement);
        if (transition.autoplay === false) {
            this.animation.pause();
        }
        this.animation.onfinish = () => {
            this.finishedTime = this.time;
            if (!pseudoElement) {
                const keyframe = getFinalKeyframe(keyframes, this.options, finalKeyframe, this.speed);
                if (this.updateMotionValue) {
                    this.updateMotionValue(keyframe);
                }
                else {
                    /**
                     * If we can, we want to commit the final style as set by the user,
                     * rather than the computed keyframe value supplied by the animation.
                     */
                    setStyle(element, name, keyframe);
                }
                this.animation.cancel();
            }
            onComplete?.();
            this.notifyFinished();
        };
    }
    play() {
        if (this.isStopped)
            return;
        this.animation.play();
        if (this.state === "finished") {
            this.updateFinished();
        }
    }
    pause() {
        this.animation.pause();
    }
    complete() {
        this.animation.finish?.();
    }
    cancel() {
        try {
            this.animation.cancel();
        }
        catch (e) { }
    }
    stop() {
        if (this.isStopped)
            return;
        this.isStopped = true;
        const { state } = this;
        if (state === "idle" || state === "finished") {
            return;
        }
        if (this.updateMotionValue) {
            this.updateMotionValue();
        }
        else {
            this.commitStyles();
        }
        if (!this.isPseudoElement)
            this.cancel();
    }
    /**
     * WAAPI doesn't natively have any interruption capabilities.
     *
     * In this method, we commit styles back to the DOM before cancelling
     * the animation.
     *
     * This is designed to be overridden by NativeAnimationExtended, which
     * will create a renderless JS animation and sample it twice to calculate
     * its current value, "previous" value, and therefore allow
     * Motion to also correctly calculate velocity for any subsequent animation
     * while deferring the commit until the next animation frame.
     */
    commitStyles() {
        if (!this.isPseudoElement) {
            this.animation.commitStyles?.();
        }
    }
    get duration() {
        const duration = this.animation.effect?.getComputedTiming?.().duration || 0;
        return millisecondsToSeconds(Number(duration));
    }
    get iterationDuration() {
        const { delay = 0 } = this.options || {};
        return this.duration + millisecondsToSeconds(delay);
    }
    get time() {
        return millisecondsToSeconds(Number(this.animation.currentTime) || 0);
    }
    set time(newTime) {
        this.finishedTime = null;
        this.animation.currentTime = secondsToMilliseconds(newTime);
    }
    /**
     * The playback speed of the animation.
     * 1 = normal speed, 2 = double speed, 0.5 = half speed.
     */
    get speed() {
        return this.animation.playbackRate;
    }
    set speed(newSpeed) {
        // Allow backwards playback after finishing
        if (newSpeed < 0)
            this.finishedTime = null;
        this.animation.playbackRate = newSpeed;
    }
    get state() {
        return this.finishedTime !== null
            ? "finished"
            : this.animation.playState;
    }
    get startTime() {
        return Number(this.animation.startTime);
    }
    set startTime(newStartTime) {
        this.animation.startTime = newStartTime;
    }
    /**
     * Attaches a timeline to the animation, for instance the `ScrollTimeline`.
     */
    attachTimeline({ timeline, observe }) {
        if (this.allowFlatten) {
            this.animation.effect?.updateTiming({ easing: "linear" });
        }
        this.animation.onfinish = null;
        if (timeline && supportsScrollTimeline()) {
            this.animation.timeline = timeline;
            return noop;
        }
        else {
            return observe(this);
        }
    }
}

export { NativeAnimation };