import { expect, test } from "vitest"

import { computed, effect, signal, trigger } from "#Source/reactor/index.ts"

/**
 * @description 这个测试文件应该与 https://github.com/stackblitz/alien-signals/blob/master/tests/trigger.spec.ts 保持同步。
 */

test("should not throw when triggering with no dependencies", () => {
  trigger(() => {
    // no op
  })
})

test("should trigger updates for dependent computed signals", () => {
  const arr = signal<number[]>(() => [])
  const length = computed(() => arr.get().length)

  expect(length.get()).toBe(0)
  arr.get().push(1)
  expect(length.get()).toBe(0)
  trigger(() => {
    arr.get()
  })
  expect(length.get()).toBe(1)
})

test("should trigger updates for the second source signal", () => {
  const src1 = signal<number[]>(() => [])
  const src2 = signal<number[]>(() => [])
  const length = computed(() => src2.get().length)

  expect(length.get()).toBe(0)
  src2.get().push(1)
  expect(length.get()).toBe(0)
  trigger(() => {
    src1.get()
    src2.get()
  })
  expect(length.get()).toBe(1)
})

test("should trigger effect once", () => {
  const src1 = signal<number[]>(() => [])
  const src2 = signal<number[]>(() => [])

  let effectRunTimes = 0

  effect(() => {
    effectRunTimes = effectRunTimes + 1
    src1.get()
    src2.get()
  })
  expect(effectRunTimes).toBe(1)

  trigger(() => {
    src1.get()
    src2.get()
  })
  expect(effectRunTimes).toBe(2)
})

test("should not notify the trigger function sub", () => {
  const src1 = signal<number[]>(() => [])
  const src2 = computed(() => src1.get())

  effect(() => {
    src1.get()
    src2.get()
  })
  trigger(() => {
    src1.get()
    src2.get()
  })
})