import { mount } from '@vue/test-utils'
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import { defineComponent, h, ref } from 'vue'
import { useTimetableKeyboard } from '@/composables/timetable/useTimetableKeyboard'
import { ArtistEngagementStatus, type Performance, type Stage } from '@/types/timetable'

/**
 * Keyboard a11y end-to-end (RFC v0.2 D20). Tests the composable directly
 * with a host component that owns a focusable canvas root, mirrors the
 * page wiring, and exposes the callback spies + announce ref so we can
 * assert without driving the whole timetable page.
 */

const stage: Stage = {
  id: 's1',
  event_id: 'ev1',
  name: 'Hardstyle District',
  color: '#e85d75',
  capacity: 1000,
  sort_order: 0,
  created_at: null,
  updated_at: null,
}

function perf(id: string): Performance {
  return {
    id,
    engagement_id: `e_${id}`,
    event_id: 'ev1',
    stage_id: 's1',
    lane: 0,
    lane_resolved: 0,
    start_at: '2026-07-10T18:00:00.000Z',
    end_at: '2026-07-10T19:00:00.000Z',
    version: 1,
    notes: null,
    warnings: [],
    engagement: {
      booking_status: { value: ArtistEngagementStatus.CONFIRMED, label: 'Bevestigd' },
    } as Performance['engagement'],
    created_at: null,
    updated_at: null,
    deleted_at: null,
  }
}

interface HostExposed {
  announce: () => string
  setSelected: (id: string | null) => void
  rootEl: () => HTMLElement | null
  callbacks: {
    nudge: ReturnType<typeof vi.fn>
    openPopover: ReturnType<typeof vi.fn>
    remove: ReturnType<typeof vi.fn>
  }
}

function mountKeyboardHost(performances: Performance[]) {
  const callbacks = {
    nudge: vi.fn().mockResolvedValue(undefined),
    openPopover: vi.fn(),
    remove: vi.fn().mockResolvedValue(undefined),
  }

  const selectedId = ref<string | null>(performances[0]?.id ?? null)

  const Host = defineComponent({
    setup(_, { expose }) {
      const rootEl = ref<HTMLElement | null>(null)
      const stagesRef = ref<Stage[]>([stage])

      const { announce } = useTimetableKeyboard({
        rootEl,
        selectedId,
        resolvePerformance: (id: string) => performances.find(p => p.id === id) ?? null,
        stages: stagesRef,
        callbacks,
      })

      expose({
        announce: () => announce.value,
        setSelected: (id: string | null) => { selectedId.value = id },
        rootEl: () => rootEl.value,
        callbacks,
      })

      return () => h('div', { 'ref': rootEl, 'tabindex': '0', 'data-test': 'canvas' }, [
        ...performances.map(p =>
          h('div', { 'data-perf-id': p.id, 'tabindex': '0' }, p.id),
        ),
      ])
    },
  })

  const wrapper = mount(Host, { attachTo: document.body })

  return { wrapper, callbacks, selectedId }
}

function getExposed(wrapper: { vm: object }): HostExposed {
  return (wrapper.vm as { $: { exposed: HostExposed } }).$.exposed
}

function dispatch(rootEl: HTMLElement | null, key: string, opts: KeyboardEventInit = {}): void {
  if (!rootEl)
    throw new Error('rootEl is null')
  rootEl.dispatchEvent(new KeyboardEvent('keydown', { key, bubbles: true, cancelable: true, ...opts }))
}

describe('useTimetableKeyboard — RFC D20 a11y model', () => {
  beforeEach(() => vi.clearAllMocks())
  afterEach(() => vi.useRealTimers())

  it('Arrow Left nudges the selected performance by -SNAP_MIN', () => {
    const { wrapper, callbacks } = mountKeyboardHost([perf('p1')])
    const exposed = getExposed(wrapper)

    dispatch(exposed.rootEl(), 'ArrowLeft')

    expect(callbacks.nudge).toHaveBeenCalledTimes(1)
    expect(callbacks.nudge.mock.calls[0][1]).toBe(-5) // -SNAP_MIN
  })

  it('Arrow Right nudges by +SNAP_MIN', () => {
    const { wrapper, callbacks } = mountKeyboardHost([perf('p1')])
    const exposed = getExposed(wrapper)

    dispatch(exposed.rootEl(), 'ArrowRight')

    expect(callbacks.nudge.mock.calls[0][1]).toBe(5)
  })

  it('Shift+Arrow Right nudges by +60 min (12 × SNAP_MIN)', () => {
    const { wrapper, callbacks } = mountKeyboardHost([perf('p1')])
    const exposed = getExposed(wrapper)

    dispatch(exposed.rootEl(), 'ArrowRight', { shiftKey: true })

    expect(callbacks.nudge.mock.calls[0][1]).toBe(60)
  })

  it('Arrow Down shifts lane (+1)', () => {
    const { wrapper, callbacks } = mountKeyboardHost([perf('p1')])
    const exposed = getExposed(wrapper)

    dispatch(exposed.rootEl(), 'ArrowDown')

    expect(callbacks.nudge.mock.calls[0][2]).toBe(1) // deltaLane
  })

  it('Shift+Arrow Down shifts stage (+1)', () => {
    const { wrapper, callbacks } = mountKeyboardHost([perf('p1')])
    const exposed = getExposed(wrapper)

    dispatch(exposed.rootEl(), 'ArrowDown', { shiftKey: true })

    expect(callbacks.nudge.mock.calls[0][3]).toBe(1) // deltaStageIdx
  })

  it('] cycles to next stage preserving time + lane', () => {
    const { wrapper, callbacks } = mountKeyboardHost([perf('p1')])
    const exposed = getExposed(wrapper)

    dispatch(exposed.rootEl(), ']')

    expect(callbacks.nudge.mock.calls[0][1]).toBe(0) // deltaMin
    expect(callbacks.nudge.mock.calls[0][2]).toBe(0) // deltaLane
    expect(callbacks.nudge.mock.calls[0][3]).toBe(1) // deltaStageIdx
  })

  it('Enter on a focused block opens the popover', () => {
    const { wrapper, callbacks } = mountKeyboardHost([perf('p1')])
    const exposed = getExposed(wrapper)

    dispatch(exposed.rootEl(), 'Enter')

    expect(callbacks.openPopover).toHaveBeenCalledTimes(1)
    expect(callbacks.openPopover.mock.calls[0][0]).toMatchObject({ id: 'p1' })
  })

  it('Delete invokes the remove callback', () => {
    const { wrapper, callbacks } = mountKeyboardHost([perf('p1')])
    const exposed = getExposed(wrapper)

    dispatch(exposed.rootEl(), 'Delete')

    expect(callbacks.remove).toHaveBeenCalledTimes(1)
    expect(callbacks.remove.mock.calls[0][0]).toMatchObject({ id: 'p1' })
  })

  it('Space enters drag mode + announces; Arrow accumulates; Enter commits', () => {
    const { wrapper, callbacks } = mountKeyboardHost([perf('p1')])
    const exposed = getExposed(wrapper)

    dispatch(exposed.rootEl(), ' ')
    expect(exposed.announce()).toMatch(/Toetsenbord-verplaatsing/i)
    expect(callbacks.nudge).not.toHaveBeenCalled()

    dispatch(exposed.rootEl(), 'ArrowRight')
    dispatch(exposed.rootEl(), 'ArrowRight')
    expect(exposed.announce()).toMatch(/Voorlopig.*\+10/) // 2 × SNAP_MIN

    // Commit
    dispatch(exposed.rootEl(), 'Enter')
    expect(callbacks.nudge).toHaveBeenCalledTimes(1)
    expect(callbacks.nudge.mock.calls[0][1]).toBe(10)
    expect(exposed.announce()).toMatch(/bevestigd/i)
  })

  it('Esc cancels keyboard drag without invoking the mutation', () => {
    const { wrapper, callbacks } = mountKeyboardHost([perf('p1')])
    const exposed = getExposed(wrapper)

    dispatch(exposed.rootEl(), ' ')
    dispatch(exposed.rootEl(), 'ArrowRight')
    dispatch(exposed.rootEl(), 'Escape')

    expect(callbacks.nudge).not.toHaveBeenCalled()
    expect(exposed.announce()).toMatch(/geannuleerd/i)
  })

  it('keys do nothing when no performance is selected', () => {
    const { wrapper, callbacks, selectedId } = mountKeyboardHost([perf('p1')])
    const exposed = getExposed(wrapper)

    selectedId.value = null

    dispatch(exposed.rootEl(), 'ArrowLeft')
    dispatch(exposed.rootEl(), 'Enter')
    dispatch(exposed.rootEl(), 'Delete')

    expect(callbacks.nudge).not.toHaveBeenCalled()
    expect(callbacks.openPopover).not.toHaveBeenCalled()
    expect(callbacks.remove).not.toHaveBeenCalled()
  })
})