import * as React from 'react'

type PossibleRef<T> = React.Ref<T> | undefined

/**
 * Set a given ref to a given value
 * This utility takes care of different types of refs: callback refs and RefObject(s)
 */
function setRef<T>(ref: PossibleRef<T>, value: T) {
  if (typeof ref === 'function') {
    return ref(value)
  }

  if (ref !== null && ref !== undefined) {
    ref.current = value
  }
}

/**
 * A utility to compose multiple refs together
 * Accepts callback refs and RefObject(s)
 */
function composeRefs<T>(...refs: PossibleRef<T>[]): React.RefCallback<T> {
  return (node) => {
    let hasCleanup = false
    const cleanups = refs.map((ref) => {
      const cleanup = setRef(ref, node)
      if (!hasCleanup && typeof cleanup === 'function') {
        hasCleanup = true
      }
      return cleanup
    })

    // React <19 will log an error to the console if a callback ref returns a
    // value. We don't use ref cleanups internally so this will only happen if a
    // user's ref callback returns a value, which we only expect if they are
    // using the cleanup functionality added in React 19.
    if (hasCleanup) {
      return () => {
        for (let i = 0; i < cleanups.length; i++) {
          const cleanup = cleanups[i]
          if (typeof cleanup === 'function') {
            cleanup()
          } else {
            setRef(refs[i], null)
          }
        }
      }
    }
  }
}

/**
 * A custom hook that composes multiple refs
 * Accepts callback refs and RefObject(s)
 */
function useComposedRefs<T>(...refs: PossibleRef<T>[]): React.RefCallback<T> {
  // eslint-disable-next-line react-hooks/exhaustive-deps
  return React.useCallback(composeRefs(...refs), refs) // we don't want to re-run this callback when the refs change
}

export { composeRefs, useComposedRefs }
