import { assign, makeGeneric, unify } from "../generics/generics.js";
import { Bool, Int } from "../primitives/types.js";
import { newLeft, newRight, match } from "../structures/sum.js";
import { fnType, sumType } from "../structures/types.js";
import { pretty } from '../util/pretty.js';

const IntOrBool = sumType(Int)(Bool);


// console.log(int5);

console.log(pretty(unify(
  makeGeneric(() => IntOrBool),
  makeGeneric(a => sumType(Int)(a)),
)));

const cipFunction = (x) => {
  return match(x)({
    left: x_as_int => (x_as_int === 5),
    right: x_as_bool => false,
  });
}

const cipFunctionType = fnType
  (IntOrBool) // in
  (Bool);

// console.log(cipFunctionType);
// console.log(IntOrBool);

console.log(assign(
  makeGeneric(() => cipFunctionType),
  makeGeneric(() => IntOrBool),
));

console.log("calling newLeft with Int:");
const typeAtCallSite = assign(
  makeGeneric((a, b) =>
    fnType
      (a)
      (sumType(a)(b))
  ),
  makeGeneric(() => Int));
console.log(pretty(typeAtCallSite));


console.log("calling cipFunction:");
console.log(pretty(assign(
  makeGeneric(() => cipFunctionType),
  typeAtCallSite,
)));

console.log("valid function calls:");
console.log(cipFunction(newLeft(5)));
console.log(cipFunction(newLeft(7)));
console.log(cipFunction(newRight(true)));

console.log("invalid function calls:");
console.log(cipFunction(5));
console.log(cipFunction(newLeft("abc")));