arcticnewone/app/composables/usePageScrollLock.ts

import { onMounted, onBeforeUnmount, watch, type Ref } from 'vue'
import { useNuxtApp } from '#app'
import type Lenis from 'lenis'
import { useAppStore } from '~/stores/app'

export const usePageScrollLock = (isLocked: Ref<boolean> | boolean) => {
  const { $lenis } = useNuxtApp() as ReturnType<typeof useNuxtApp> & { $lenis?: Lenis }
  
  const lockScroll = () => {
    if (import.meta.client) {
      document.documentElement.classList.add('is-home-intro-active')
      $lenis?.scrollTo(0, { immediate: true })
      $lenis?.stop()
    }
  }

  const unlockScroll = () => {
    if (import.meta.client) {
      document.documentElement.classList.remove('is-home-intro-active')
      $lenis?.start()
    }
  }

  // If passed a boolean, lock immediately and unlock on unmount
  if (typeof isLocked === 'boolean') {
    if (isLocked) {
      onMounted(() => {
        lockScroll()
      })
      onBeforeUnmount(() => {
        unlockScroll()
      })
    }
  } else {
    // If passed a ref, watch its value
    watch(isLocked, (locked) => {
      if (locked) {
        lockScroll()
      } else {
        unlockScroll()
      }
    }, { immediate: true })
    
    onBeforeUnmount(() => {
      unlockScroll()
    })
  }

  return { lockScroll, unlockScroll }
}