import { isGenerator, calcGeneratorDuration } from 'motion-dom';
import { invariant, millisecondsToSeconds, secondsToMilliseconds } from 'motion-utils';
import { KeyframeResolver } from '../../render/utils/KeyframesResolver.mjs';
import { activeAnimations } from '../../stats/animation-count.mjs';
import { clamp } from '../../utils/clamp.mjs';
import { mix } from '../../utils/mix/index.mjs';
import { pipe } from '../../utils/pipe.mjs';
import { inertia } from '../generators/inertia.mjs';
import { keyframes } from '../generators/keyframes.mjs';
import { spring } from '../generators/spring/index.mjs';
import { BaseAnimation } from './BaseAnimation.mjs';
import { frameloopDriver } from './drivers/driver-frameloop.mjs';
import { getFinalKeyframe } from './waapi/utils/get-final-keyframe.mjs';

const generators = {
    decay: inertia,
    inertia,
    tween: keyframes,
    keyframes: keyframes,
    spring,
};
const percentToProgress = (percent) => percent / 100;
/**
 * Animation that runs on the main thread. Designed to be WAAPI-spec in the subset of
 * features we expose publically. Mostly the compatibility is to ensure visual identity
 * between both WAAPI and main thread animations.
 */
class MainThreadAnimation extends BaseAnimation {
    constructor(options) {
        super(options);
        /**
         * The time at which the animation was paused.
         */
        this.holdTime = null;
        /**
         * The time at which the animation was cancelled.
         */
        this.cancelTime = null;
        /**
         * The current time of the animation.
         */
        this.currentTime = 0;
        /**
         * Playback speed as a factor. 0 would be stopped, -1 reverse and 2 double speed.
         */
        this.playbackSpeed = 1;
        /**
         * The state of the animation to apply when the animation is resolved. This
         * allows calls to the public API to control the animation before it is resolved,
         * without us having to resolve it first.
         */
        this.pendingPlayState = "running";
        /**
         * The time at which the animation was started.
         */
        this.startTime = null;
        this.state = "idle";
        /**
         * This method is bound to the instance to fix a pattern where
         * animation.stop is returned as a reference from a useEffect.
         */
        this.stop = () => {
            this.resolver.cancel();
            this.isStopped = true;
            if (this.state === "idle")
                return;
            this.teardown();
            const { onStop } = this.options;
            onStop && onStop();
        };
        const { name, motionValue, element, keyframes } = this.options;
        const KeyframeResolver$1 = (element === null || element === void 0 ? void 0 : element.KeyframeResolver) || KeyframeResolver;
        const onResolved = (resolvedKeyframes, finalKeyframe) => this.onKeyframesResolved(resolvedKeyframes, finalKeyframe);
        this.resolver = new KeyframeResolver$1(keyframes, onResolved, name, motionValue, element);
        this.resolver.scheduleResolve();
    }
    flatten() {
        super.flatten();
        // If we've already resolved the animation, re-initialise it
        if (this._resolved) {
            Object.assign(this._resolved, this.initPlayback(this._resolved.keyframes));
        }
    }
    initPlayback(keyframes$1) {
        const { type = "keyframes", repeat = 0, repeatDelay = 0, repeatType, velocity = 0, } = this.options;
        const generatorFactory = isGenerator(type)
            ? type
            : generators[type] || keyframes;
        /**
         * If our generator doesn't support mixing numbers, we need to replace keyframes with
         * [0, 100] and then make a function that maps that to the actual keyframes.
         *
         * 100 is chosen instead of 1 as it works nicer with spring animations.
         */
        let mapPercentToKeyframes;
        let mirroredGenerator;
        if (process.env.NODE_ENV !== "production" &&
            generatorFactory !== keyframes) {
            invariant(keyframes$1.length <= 2, `Only two keyframes currently supported with spring and inertia animations. Trying to animate ${keyframes$1}`);
        }
        if (generatorFactory !== keyframes &&
            typeof keyframes$1[0] !== "number") {
            mapPercentToKeyframes = pipe(percentToProgress, mix(keyframes$1[0], keyframes$1[1]));
            keyframes$1 = [0, 100];
        }
        const generator = generatorFactory({ ...this.options, keyframes: keyframes$1 });
        /**
         * If we have a mirror repeat type we need to create a second generator that outputs the
         * mirrored (not reversed) animation and later ping pong between the two generators.
         */
        if (repeatType === "mirror") {
            mirroredGenerator = generatorFactory({
                ...this.options,
                keyframes: [...keyframes$1].reverse(),
                velocity: -velocity,
            });
        }
        /**
         * If duration is undefined and we have repeat options,
         * we need to calculate a duration from the generator.
         *
         * We set it to the generator itself to cache the duration.
         * Any timeline resolver will need to have already precalculated
         * the duration by this step.
         */
        if (generator.calculatedDuration === null) {
            generator.calculatedDuration = calcGeneratorDuration(generator);
        }
        const { calculatedDuration } = generator;
        const resolvedDuration = calculatedDuration + repeatDelay;
        const totalDuration = resolvedDuration * (repeat + 1) - repeatDelay;
        return {
            generator,
            mirroredGenerator,
            mapPercentToKeyframes,
            calculatedDuration,
            resolvedDuration,
            totalDuration,
        };
    }
    onPostResolved() {
        const { autoplay = true } = this.options;
        activeAnimations.mainThread++;
        this.play();
        if (this.pendingPlayState === "paused" || !autoplay) {
            this.pause();
        }
        else {
            this.state = this.pendingPlayState;
        }
    }
    tick(timestamp, sample = false) {
        const { resolved } = this;
        // If the animations has failed to resolve, return the final keyframe.
        if (!resolved) {
            const { keyframes } = this.options;
            return { done: true, value: keyframes[keyframes.length - 1] };
        }
        const { finalKeyframe, generator, mirroredGenerator, mapPercentToKeyframes, keyframes, calculatedDuration, totalDuration, resolvedDuration, } = resolved;
        if (this.startTime === null)
            return generator.next(0);
        const { delay, repeat, repeatType, repeatDelay, onUpdate } = this.options;
        /**
         * requestAnimationFrame timestamps can come through as lower than
         * the startTime as set by performance.now(). Here we prevent this,
         * though in the future it could be possible to make setting startTime
         * a pending operation that gets resolved here.
         */
        if (this.speed > 0) {
            this.startTime = Math.min(this.startTime, timestamp);
        }
        else if (this.speed < 0) {
            this.startTime = Math.min(timestamp - totalDuration / this.speed, this.startTime);
        }
        // Update currentTime
        if (sample) {
            this.currentTime = timestamp;
        }
        else if (this.holdTime !== null) {
            this.currentTime = this.holdTime;
        }
        else {
            // Rounding the time because floating point arithmetic is not always accurate, e.g. 3000.367 - 1000.367 =
            // 2000.0000000000002. This is a problem when we are comparing the currentTime with the duration, for
            // example.
            this.currentTime =
                Math.round(timestamp - this.startTime) * this.speed;
        }
        // Rebase on delay
        const timeWithoutDelay = this.currentTime - delay * (this.speed >= 0 ? 1 : -1);
        const isInDelayPhase = this.speed >= 0
            ? timeWithoutDelay < 0
            : timeWithoutDelay > totalDuration;
        this.currentTime = Math.max(timeWithoutDelay, 0);
        // If this animation has finished, set the current time  to the total duration.
        if (this.state === "finished" && this.holdTime === null) {
            this.currentTime = totalDuration;
        }
        let elapsed = this.currentTime;
        let frameGenerator = generator;
        if (repeat) {
            /**
             * Get the current progress (0-1) of the animation. If t is >
             * than duration we'll get values like 2.5 (midway through the
             * third iteration)
             */
            const progress = Math.min(this.currentTime, totalDuration) / resolvedDuration;
            /**
             * Get the current iteration (0 indexed). For instance the floor of
             * 2.5 is 2.
             */
            let currentIteration = Math.floor(progress);
            /**
             * Get the current progress of the iteration by taking the remainder
             * so 2.5 is 0.5 through iteration 2
             */
            let iterationProgress = progress % 1.0;
            /**
             * If iteration progress is 1 we count that as the end
             * of the previous iteration.
             */
            if (!iterationProgress && progress >= 1) {
                iterationProgress = 1;
            }
            iterationProgress === 1 && currentIteration--;
            currentIteration = Math.min(currentIteration, repeat + 1);
            /**
             * Reverse progress if we're not running in "normal" direction
             */
            const isOddIteration = Boolean(currentIteration % 2);
            if (isOddIteration) {
                if (repeatType === "reverse") {
                    iterationProgress = 1 - iterationProgress;
                    if (repeatDelay) {
                        iterationProgress -= repeatDelay / resolvedDuration;
                    }
                }
                else if (repeatType === "mirror") {
                    frameGenerator = mirroredGenerator;
                }
            }
            elapsed = clamp(0, 1, iterationProgress) * resolvedDuration;
        }
        /**
         * If we're in negative time, set state as the initial keyframe.
         * This prevents delay: x, duration: 0 animations from finishing
         * instantly.
         */
        const state = isInDelayPhase
            ? { done: false, value: keyframes[0] }
            : frameGenerator.next(elapsed);
        if (mapPercentToKeyframes) {
            state.value = mapPercentToKeyframes(state.value);
        }
        let { done } = state;
        if (!isInDelayPhase && calculatedDuration !== null) {
            done =
                this.speed >= 0
                    ? this.currentTime >= totalDuration
                    : this.currentTime <= 0;
        }
        const isAnimationFinished = this.holdTime === null &&
            (this.state === "finished" || (this.state === "running" && done));
        if (isAnimationFinished && finalKeyframe !== undefined) {
            state.value = getFinalKeyframe(keyframes, this.options, finalKeyframe);
        }
        if (onUpdate) {
            onUpdate(state.value);
        }
        if (isAnimationFinished) {
            this.finish();
        }
        return state;
    }
    get duration() {
        const { resolved } = this;
        return resolved ? millisecondsToSeconds(resolved.calculatedDuration) : 0;
    }
    get time() {
        return millisecondsToSeconds(this.currentTime);
    }
    set time(newTime) {
        newTime = secondsToMilliseconds(newTime);
        this.currentTime = newTime;
        if (this.holdTime !== null || this.speed === 0) {
            this.holdTime = newTime;
        }
        else if (this.driver) {
            this.startTime = this.driver.now() - newTime / this.speed;
        }
    }
    get speed() {
        return this.playbackSpeed;
    }
    set speed(newSpeed) {
        const hasChanged = this.playbackSpeed !== newSpeed;
        this.playbackSpeed = newSpeed;
        if (hasChanged) {
            this.time = millisecondsToSeconds(this.currentTime);
        }
    }
    play() {
        if (!this.resolver.isScheduled) {
            this.resolver.resume();
        }
        if (!this._resolved) {
            this.pendingPlayState = "running";
            return;
        }
        if (this.isStopped)
            return;
        const { driver = frameloopDriver, onPlay, startTime } = this.options;
        if (!this.driver) {
            this.driver = driver((timestamp) => this.tick(timestamp));
        }
        onPlay && onPlay();
        const now = this.driver.now();
        if (this.holdTime !== null) {
            this.startTime = now - this.holdTime;
        }
        else if (!this.startTime) {
            this.startTime = startTime !== null && startTime !== void 0 ? startTime : this.calcStartTime();
        }
        else if (this.state === "finished") {
            this.startTime = now;
        }
        if (this.state === "finished") {
            this.updateFinishedPromise();
        }
        this.cancelTime = this.startTime;
        this.holdTime = null;
        /**
         * Set playState to running only after we've used it in
         * the previous logic.
         */
        this.state = "running";
        this.driver.start();
    }
    pause() {
        var _a;
        if (!this._resolved) {
            this.pendingPlayState = "paused";
            return;
        }
        this.state = "paused";
        this.holdTime = (_a = this.currentTime) !== null && _a !== void 0 ? _a : 0;
    }
    complete() {
        if (this.state !== "running") {
            this.play();
        }
        this.pendingPlayState = this.state = "finished";
        this.holdTime = null;
    }
    finish() {
        this.teardown();
        this.state = "finished";
        const { onComplete } = this.options;
        onComplete && onComplete();
    }
    cancel() {
        if (this.cancelTime !== null) {
            this.tick(this.cancelTime);
        }
        this.teardown();
        this.updateFinishedPromise();
    }
    teardown() {
        this.state = "idle";
        this.stopDriver();
        this.resolveFinishedPromise();
        this.updateFinishedPromise();
        this.startTime = this.cancelTime = null;
        this.resolver.cancel();
        activeAnimations.mainThread--;
    }
    stopDriver() {
        if (!this.driver)
            return;
        this.driver.stop();
        this.driver = undefined;
    }
    sample(time) {
        this.startTime = 0;
        return this.tick(time, true);
    }
}
// Legacy interface
function animateValue(options) {
    return new MainThreadAnimation(options);
}

export { MainThreadAnimation, animateValue };