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import { addition } from './index';
import { Add } from './nat';
import { ApplyRewrite, ChainRewrites, Flip, Eq, VerifyEquation } from './util';

type assert<T extends true> = T;

export type specIdentity = [
  assert<Eq<
    ApplyRewrite<Add<'A', Add<'B', '0'>>, addition.Identity<'B'>>,
    Add<'A', 'B'>
  >>,
  assert<Eq<
    ApplyRewrite<Add<Add<'A', 'B'>, '0'>, addition.Identity<Add<'A', 'B'>>>,
    Add<'A', 'B'>
  >>,
  assert<Eq<
    ApplyRewrite<Add<'A', 'B'>, Flip<addition.Identity<Add<'A', 'B'>>>>,
    Add<Add<'A', 'B'>, '0'>
  >>,
  assert<Eq<
    ApplyRewrite<Add<'A', Add<'B', Add<'C', '0'>>>, addition.Identity<'C'>>,
    Add<'A', Add<'B', 'C'>>
  >>,
]

export type specCommutativity = [
  assert<Eq<
    ApplyRewrite<Add<'A', 'B'>, addition.Commutativity<'A', 'B'>>,
    Add<'B', 'A'>
  >>,
  assert<Eq<
    ApplyRewrite<Add<Add<'A', 'B'>, 'C'>, addition.Commutativity<'A', 'B'>>,
    Add<Add<'B', 'A'>, 'C'>
  >>,
  assert<Eq<
    ApplyRewrite<Add<'A', Add<'B', 'C'>>, addition.Commutativity<'B', 'C'>>,
    Add<'A', Add<'C', 'B'>>
  >>,
]

export type specCommutativityInduction = [
  assert<VerifyEquation<addition.Comm_Base<'B'>>>,
  assert<VerifyEquation<addition.Comm_Inductive<'A', 'B'>>>,
]

export type specChainRewrites = [
  assert<Eq<
    ChainRewrites<
      [
        addition.Commutativity<'0', 'B'>,
        addition.Identity<'B'>,
      ],
      Add<Add<'0', 'B'>, 'C'>
    >,
    Add<'B', 'C'>
  >>,
  assert<Eq<
    ChainRewrites<
      [
        addition.Commutativity<'0', 'B'>,
        addition.Identity<'B'>,
        Flip<addition.Identity<Add<'B', 'C'>>>,
        addition.Commutativity<Add<'B', 'C'>, '0'>,
      ],
      Add<Add<'0', 'B'>, 'C'>
    >,
    Add<'0', Add<'B', 'C'>>
  >>,
]

export type specAssociativityInduction = [
  assert<VerifyEquation<addition.Assoc_Base<'B', 'C'>>>,
  assert<VerifyEquation<addition.Assoc_Inductive<'A', 'B', 'C'>>>,
]