import { computed, getCurrentInstance } from "vue"

export function useModel<Type>(
  propName = "modelValue",
  options: { type?: "object" | "array" } = {}
) {
  const vm = getCurrentInstance()?.proxy
  if (!vm) throw "useModel is called without an instance"

  let valueToSet: (arg0: Type) => Type

  // @ts-expect-error strange typing
  if (options.type === "object") valueToSet = (value: object) => ({ ...value })
  else if (options.type === "array")
    // @ts-expect-error strange typing
    valueToSet = (value: unknown[]) => [...value]
  else valueToSet = (value: Type) => value

  return computed<Type>({
    get() {
      // @ts-expect-error strange typing
      return vm.$props[propName]
    },
    set(value) {
      vm.$emit(`update:${propName}`, valueToSet(value))
    },
  })
}