import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import {
  GuideAutoSwitchStateMachine,
  type GuideAutoSwitchDirection,
  type GuideAutoSwitchInputSource
} from '@/components/map/guideAutoSwitchStateMachine'

const createMachine = () => {
  const requests: GuideAutoSwitchDirection[] = []
  const machine = new GuideAutoSwitchStateMachine({
    onSwitchRequested: ({ direction }) => requests.push(direction)
  })

  return { machine, requests }
}

beforeEach(() => {
  vi.useFakeTimers()
  vi.setSystemTime(0)
})

afterEach(() => {
  vi.useRealTimers()
})

describe('建筑外观与馆内楼层自动切换状态机', () => {
  it('连续放大 14.9% 不进入，达到 15% 后进入', () => {
    const { machine, requests } = createMachine()

    machine.beginInput(100, 'gesture')
    machine.updateDistance(85.1, { source: 'gesture' })
    vi.advanceTimersByTime(400)
    expect(requests).toEqual([])

    machine.updateDistance(85, { source: 'gesture' })
    vi.advanceTimersByTime(120)
    expect(requests).toEqual(['enter-floor'])
  })

  it('进入条件必须连续保持 120ms', () => {
    const { machine, requests } = createMachine()

    machine.beginInput(100, 'wheel')
    machine.updateDistance(85, { source: 'wheel' })
    vi.advanceTimersByTime(119)
    expect(requests).toEqual([])
    vi.advanceTimersByTime(1)
    expect(requests).toEqual(['enter-floor'])
  })

  it('两次滚轮事件累计不足 15% 时不进入', () => {
    const { machine, requests } = createMachine()

    machine.beginInput(100, 'wheel')
    machine.updateDistance(95, { source: 'wheel' })
    machine.beginInput(95, 'wheel')
    machine.updateDistance(90, { source: 'wheel' })
    vi.advanceTimersByTime(400)

    expect(requests).toEqual([])
  })

  it('相对楼层初始距离拉远 19.9% 不退出，达到 20% 后退出', () => {
    const { machine, requests } = createMachine()

    machine.setView('floor')
    machine.setFloorInitialDistance(100)
    machine.updateDistance(119.9)
    vi.advanceTimersByTime(500)
    expect(requests).toEqual([])

    machine.updateDistance(120)
    vi.advanceTimersByTime(400)
    expect(requests).toEqual(['exit-overview'])
  })

  it('退出条件必须连续保持 400ms', () => {
    const { machine, requests } = createMachine()

    machine.setView('floor')
    machine.setFloorInitialDistance(100)
    machine.updateDistance(120)
    vi.advanceTimersByTime(399)
    expect(requests).toEqual([])
    vi.advanceTimersByTime(1)
    expect(requests).toEqual(['exit-overview'])
  })

  it('0.8% 内的触控反向抖动不重置进入基准，也不取消候选状态', () => {
    const { machine, requests } = createMachine()

    machine.beginInput(100, 'touch', { resetBaseline: true })
    machine.updateDistance(85, { source: 'touch' })
    vi.advanceTimersByTime(60)
    machine.updateDistance(85.6, { source: 'touch' })
    vi.advanceTimersByTime(60)

    expect(requests).toEqual(['enter-floor'])
  })

  it('明确反向缩放超过 0.8% 后取消候选并重置进入基准', () => {
    const { machine, requests } = createMachine()

    machine.beginInput(100, 'touch', { resetBaseline: true })
    machine.updateDistance(85, { source: 'touch' })
    vi.advanceTimersByTime(60)
    machine.updateDistance(86, { source: 'touch' })
    vi.advanceTimersByTime(120)

    expect(requests).toEqual([])

    machine.updateDistance(73, { source: 'touch' })
    vi.advanceTimersByTime(120)
    expect(requests).toEqual(['enter-floor'])
  })

  it('退出候选明确反向超过 0.8% 后会取消防抖任务', () => {
    const { machine, requests } = createMachine()

    machine.setView('floor')
    machine.setFloorInitialDistance(100)
    machine.updateDistance(120)
    vi.advanceTimersByTime(200)
    machine.updateDistance(118.9)
    vi.advanceTimersByTime(400)

    expect(requests).toEqual([])
  })

  it('进入意图超时后使用新的连续缩放距离重新计算基准', () => {
    const { machine, requests } = createMachine()

    machine.beginInput(100, 'wheel')
    machine.updateDistance(90, { source: 'wheel' })
    vi.advanceTimersByTime(2001)
    machine.updateDistance(80, { previousDistance: 90, source: 'wheel' })
    vi.advanceTimersByTime(120)
    expect(requests).toEqual([])

    machine.updateDistance(76.5, { source: 'wheel' })
    vi.advanceTimersByTime(120)
    expect(requests).toEqual(['enter-floor'])
  })

  it('切换成功后 1499ms 内不能反向切换，1500ms 后可以', () => {
    const { machine, requests } = createMachine()

    machine.beginInput(100, 'wheel')
    machine.updateDistance(85, { source: 'wheel' })
    vi.advanceTimersByTime(120)
    expect(requests).toEqual(['enter-floor'])

    machine.markTransitionSucceeded()
    machine.setView('floor')
    machine.setFloorInitialDistance(100)
    machine.updateDistance(120)
    vi.advanceTimersByTime(1499)
    expect(requests).toEqual(['enter-floor'])
    vi.advanceTimersByTime(1)
    expect(requests).toEqual(['enter-floor', 'exit-overview'])
  })

  it.each<GuideAutoSwitchInputSource>(['wheel', 'button', 'touch'])(
    '%s 路径使用同一套 15% 进入判断',
    (source) => {
      const { machine, requests } = createMachine()

      machine.beginInput(100, source, { resetBaseline: source === 'touch' })
      machine.updateDistance(85.1, { source })
      vi.advanceTimersByTime(400)
      expect(requests).toEqual([])

      machine.updateDistance(85, { source })
      vi.advanceTimersByTime(120)
      expect(requests).toEqual(['enter-floor'])
    }
  )
})