import { expect, test, vi } from "vitest"

import { LogScheduler, getGlobalLogScheduler } from "#Source/log/index.ts"

test("LogScheduler enqueue dispatches immediately in immediate strategy", () => {
  const scheduler = new LogScheduler({ strategy: "immediate" })
  const emit1 = vi.fn()
  const emit2 = vi.fn()

  scheduler.enqueue([
    { record: { type: "log", tags: ["a"], messages: ["one"] }, emit: emit1 },
    { record: { type: "info", tags: ["a"], messages: ["two"] }, emit: emit2 },
  ])

  expect(emit1).toHaveBeenCalledTimes(1)
  expect(emit2).toHaveBeenCalledTimes(1)
})

test("LogScheduler run flushes queued tasks", () => {
  const scheduler = new LogScheduler({ strategy: "immediate" })
  const emit1 = vi.fn()
  const emit2 = vi.fn()

  scheduler.enqueue([
    { record: { type: "log", tags: ["a"], messages: ["one"] }, emit: emit1 },
    { record: { type: "info", tags: ["a"], messages: ["two"] }, emit: emit2 },
  ])
  scheduler.run()

  expect(emit1).toHaveBeenCalledTimes(1)
  expect(emit2).toHaveBeenCalledTimes(1)
  expect(scheduler.hasTasks()).toEqual(false)
})

test("getGlobalLogScheduler returns singleton instance", () => {
  const scheduler1 = getGlobalLogScheduler()
  const scheduler2 = getGlobalLogScheduler()

  expect(scheduler1).toBe(scheduler2)
})