import {
  applyScope,
  constant,
  debounce,
  isEventStream,
  never,
  toProperty,
} from "."
import {
  expectPropertyEvents,
  expectStreamEvents,
  expectStreamTimings,
  series,
  testScope,
} from "./test-utils"

describe("EventStream.debounce(delay)", function () {
  describe("throttles input by given delay", () =>
    expectStreamEvents(() => {
      const s = series(2, [1, 1, 1, 1, 2]).pipe(debounce(7))
      return s
    }, [2]))
  describe("waits for a quiet period before outputing anything", () =>
    expectStreamTimings(
      () => series(2, [1, 2, 3, 4]).pipe(debounce(3)),
      [[11, 4]]
    ))

  it("Scoped debounce", () => {
    const s = series(2, [1, 1, 1, 1, 2]).pipe(debounce(7, testScope()))
    expect(isEventStream(s)).toEqual(true)
  })

  it("toString", () =>
    expect(debounce(1)(never()).toString()).toEqual(
      "EventStreamSeed never.debounce(1)"
    ))
})

describe("Property.debounce", function () {
  describe("throttles changes, but not initial value", () =>
    expectPropertyEvents(() => {
      const p = series(1, [1, 2, 3]).pipe(
        debounce(4),
        toProperty(0),
        applyScope(testScope())
      )
      return p
    }, [0, 3]))
  it("toString", () =>
    expect(debounce(1)(constant(0)).toString()).toEqual(
      "PropertySeed constant(0).debounce(1)"
    ))
})