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import { attachSpring, motionValue } from "motion"
import type { SpringOptions } from "motion"
import { createEffect, createSignal, onCleanup } from "solid-js"
import { prefersReducedMotion } from "../hooks/use-reduced-motion"
type Opt = Pick<SpringOptions, "visualDuration" | "bounce" | "stiffness" | "damping" | "mass" | "velocity">
const eq = (a: Opt | undefined, b: Opt | undefined) =>
a?.visualDuration === b?.visualDuration &&
a?.bounce === b?.bounce &&
a?.stiffness === b?.stiffness &&
a?.damping === b?.damping &&
a?.mass === b?.mass &&
a?.velocity === b?.velocity
export function useSpring(target: () => number, options?: Opt | (() => Opt)) {
const read = () => (typeof options === "function" ? options() : options)
const reduce = prefersReducedMotion
const [value, setValue] = createSignal(target())
const source = motionValue(value())
const spring = motionValue(value())
let config = read()
let reduced = reduce()
let stop = reduced ? () => {} : attachSpring(spring, source, config)
let off = spring.on("change", (next) => setValue(next))
createEffect(() => {
const next = target()
if (reduced) {
source.set(next)
spring.set(next)
setValue(next)
return
}
source.set(next)
})
createEffect(() => {
const next = read()
const skip = reduce()
if (eq(config, next) && reduced === skip) return
config = next
reduced = skip
stop()
stop = skip ? () => {} : attachSpring(spring, source, next)
if (skip) {
const value = target()
source.set(value)
spring.set(value)
setValue(value)
return
}
setValue(spring.get())
})
onCleanup(() => {
off()
stop()
spring.destroy()
source.destroy()
})
return value
}
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