import * as O from "optics-ts"
import * as L from "./index"
describe("optics-ts", () => {
  describe("basic optics can be used with Lonna atoms", () => {
    type Data = {
      foo: { bar: number }
      other: string
    }
    const original = { foo: { bar: 1 }, other: "hello" }
    it("Lens", () => {
      const foo = O.optic<Data>().prop("foo") // as L.Lens<Data, { bar: number }>

      const a = L.atom<Data>(original)
      const viewed = L.view(a, foo)

      expect(viewed.get()).toEqual({ bar: 1 })
      viewed.set({ bar: 2 })
      expect(a.get()).toEqual({ foo: { bar: 2 }, other: "hello" })
    })
    it("Equivalence", () => {
      const eq = O.optic<Data>()

      const a = L.atom<Data>(original)
      const viewed = L.view(a, eq)

      expect(viewed.get()).toEqual(original)
      const modified = { foo: { bar: 2 }, other: "hello" }
      viewed.set(modified)
      expect(a.get()).toEqual(modified)
    })
    it("Isomorpohism", () => {
      const eq = O.optic<Data>().iso(
        (x) => x,
        (x) => x
      )

      const a = L.atom<Data>(original)
      const viewed = L.view(a, eq)

      expect(viewed.get()).toEqual(original)
      const modified = { foo: { bar: 2 }, other: "hello" }
      viewed.set(modified)
      expect(a.get()).toEqual(modified)
    })
  })
})