export const PACKAGE_NAME = 'react-native-nitro-chucker'

export type NitroChuckerPluginProps = { enabled?: boolean }

type Json = Record<string, any>

// Add or remove PACKAGE_NAME from obj[key], pruning the key when the list empties.
function applyToList(obj: Json, key: string, shouldExclude: boolean): void {
  const current = Array.isArray(obj[key])
    ? obj[key].filter((x: unknown): x is string => typeof x === 'string')
    : []
  if (shouldExclude) {
    obj[key] = current.includes(PACKAGE_NAME)
      ? current
      : [...current, PACKAGE_NAME]
    return
  }
  const filtered = current.filter((x: string) => x !== PACKAGE_NAME)
  if (filtered.length) obj[key] = filtered
  else delete obj[key]
}

export function applyExclusion(
  pkg: Json,
  props?: NitroChuckerPluginProps
): Json {
  const shouldExclude = props?.enabled === false
  // package.json is pure JSON: clone via JSON to avoid mutating the input.
  const next: Json = JSON.parse(JSON.stringify(pkg))

  next.expo ??= {}
  next.expo.autolinking ??= {}
  const al: Json = next.expo.autolinking
  al.ios ??= {}
  al.android ??= {}

  applyToList(al, 'exclude', shouldExclude)
  applyToList(al.ios, 'exclude', shouldExclude)
  applyToList(al.android, 'exclude', shouldExclude)

  if (!shouldExclude) {
    if (Object.keys(al.ios).length === 0) delete al.ios
    if (Object.keys(al.android).length === 0) delete al.android
    if (Object.keys(al).length === 0) delete next.expo.autolinking
    if (Object.keys(next.expo).length === 0) delete next.expo
  }

  return next
}