import { Char, Double, Int } from "../primitives/types.js";

export const compareNumbers = x => y => {
  if (typeof(x) !== 'number' || typeof(y) !== 'number') {
    throw new Error(`was only meant to compare numbers! got ${x} and ${y}`);
  }
  return (x < y) ? -1 : (x > y) ? 1 : 0;
}

export const compareStrings = x => y => {
  if (typeof(x) !== 'string' || typeof(y) !== 'string') {
    throw new Error(`was only meant to compare strings! got ${x} and ${y}`);
  }
  return (x < y) ? -1 : (x > y) ? 1 : 0;
}

export const compareBools = x => y => {
  if (typeof(x) !== 'boolean' || typeof(y) !== 'boolean') {
    throw new Error(`was only meant to compare booleans! got ${x} and ${y}`);
  }
  return x - y;
};

export const typeToCmp = new Map([
  [Int, compareNumbers],
  [Char, compareStrings],
  [Double, compareNumbers],
  [Boolean, compareBools],
]);