import { Bool, Type } from "./primitives/types.js";
import { typedFnType } from "./structures/types.js";
import { deepEqual } from "./util.js";

export const getSymbol = type => type.symbol;
export const getParams = type => type.params;

// we can test whether types are equal:
export const eqType = deepEqual;

// a module is just a set of typed objects
// each 'typed object' is implicitly an instance of TypeLink (defined below)
export const ModuleType = {l:[  
  // TODO? maybe follow Lean so
  //    Type.{0} : Type.{1}
  //    Type.{1} : Type.{2}
  //    ...
  // see: https://lean-lang.org/functional_programming_in_lean/functor-applicative-monad/universes.html

  // Type :: Type
  {i: Type, t: Type},

  // ...typedFnType(getSymbol, fnType => fnType({in: Type, out: Int})),

  // ...typedFnType(getParams, fnType => fnType({in: Type, out: lsType(Type)})),

  // Type -> Type -> Bool
  ...typedFnType(eqType, fnType =>
    fnType
      (Type)
      (fnType
        (Type)
        (Bool)
      )),
]};