import { isGenerator } from 'motion-dom';
import { warning } from 'motion-utils';
import { isAnimatable } from '../../utils/is-animatable.mjs';

function hasKeyframesChanged(keyframes) {
    const current = keyframes[0];
    if (keyframes.length === 1)
        return true;
    for (let i = 0; i < keyframes.length; i++) {
        if (keyframes[i] !== current)
            return true;
    }
}
function canAnimate(keyframes, name, type, velocity) {
    /**
     * Check if we're able to animate between the start and end keyframes,
     * and throw a warning if we're attempting to animate between one that's
     * animatable and another that isn't.
     */
    const originKeyframe = keyframes[0];
    if (originKeyframe === null)
        return false;
    /**
     * These aren't traditionally animatable but we do support them.
     * In future we could look into making this more generic or replacing
     * this function with mix() === mixImmediate
     */
    if (name === "display" || name === "visibility")
        return true;
    const targetKeyframe = keyframes[keyframes.length - 1];
    const isOriginAnimatable = isAnimatable(originKeyframe, name);
    const isTargetAnimatable = isAnimatable(targetKeyframe, name);
    warning(isOriginAnimatable === isTargetAnimatable, `You are trying to animate ${name} from "${originKeyframe}" to "${targetKeyframe}". ${originKeyframe} is not an animatable value - to enable this animation set ${originKeyframe} to a value animatable to ${targetKeyframe} via the \`style\` property.`);
    // Always skip if any of these are true
    if (!isOriginAnimatable || !isTargetAnimatable) {
        return false;
    }
    return (hasKeyframesChanged(keyframes) ||
        ((type === "spring" || isGenerator(type)) && velocity));
}

export { canAnimate };