// NOTE: This test is implemented based on the case of `runtime-core/__test__/componentSlots.spec.ts`.

import {
  createComponent,
  createSlot,
  createVaporApp,
  defineComponent,
  getCurrentInstance,
  insert,
  nextTick,
  prepend,
  ref,
  renderEffect,
  setText,
  template,
} from '../src'
import { makeRender } from './_utils'

const define = makeRender<any>()
function renderWithSlots(slots: any): any {
  let instance: any
  const Comp = defineComponent({
    render() {
      const t0 = template('<div></div>')
      const n0 = t0()
      instance = getCurrentInstance()
      return n0
    },
  })

  const { render } = define({
    render() {
      return createComponent(Comp, {}, slots)
    },
  })

  render()
  return instance
}

describe('component: slots', () => {
  test('initSlots: instance.slots should be set correctly', () => {
    let instance: any
    const Comp = defineComponent({
      render() {
        const t0 = template('<div></div>')
        const n0 = t0()
        instance = getCurrentInstance()
        return n0
      },
    })

    const { render } = define({
      render() {
        return createComponent(Comp, {}, { header: () => template('header')() })
      },
    })

    render()

    expect(instance.slots.header()).toMatchObject(
      document.createTextNode('header'),
    )
  })

  // NOTE: slot normalization is not supported
  test.todo(
    'initSlots: should normalize object slots (when value is null, string, array)',
    () => {},
  )
  test.todo(
    'initSlots: should normalize object slots (when value is function)',
    () => {},
  )

  // runtime-core's "initSlots: instance.slots should be set correctly (when vnode.shapeFlag is not SLOTS_CHILDREN)"
  test('initSlots: instance.slots should be set correctly', () => {
    const { slots } = renderWithSlots({
      default: () => template('<span></span>')(),
    })

    // expect(
    //   '[Vue warn]: Non-function value encountered for default slot. Prefer function slots for better performance.',
    // ).toHaveBeenWarned()

    expect(slots.default()).toMatchObject(document.createElement('span'))
  })

  test('updateSlots: instance.slots should be updated correctly', async () => {
    const flag1 = ref(true)

    let instance: any
    const Child = () => {
      instance = getCurrentInstance()
      return template('child')()
    }

    const { render } = define({
      render() {
        return createComponent(Child, {}, { _: 2 as any }, () => [
          flag1.value
            ? { name: 'one', fn: () => template('<span></span>')() }
            : { name: 'two', fn: () => template('<div></div>')() },
        ])
      },
    })

    render()

    expect(instance.slots).toHaveProperty('one')
    expect(instance.slots).not.toHaveProperty('two')

    flag1.value = false
    await nextTick()

    expect(instance.slots).not.toHaveProperty('one')
    expect(instance.slots).toHaveProperty('two')
  })

  // NOTE: it is not supported
  // test('updateSlots: instance.slots should be updated correctly (when slotType is null)', () => {})

  // runtime-core's "updateSlots: instance.slots should be update correctly (when vnode.shapeFlag is not SLOTS_CHILDREN)"
  test('updateSlots: instance.slots should be update correctly', async () => {
    const flag1 = ref(true)

    let instance: any
    const Child = () => {
      instance = getCurrentInstance()
      return template('child')()
    }

    const { render } = define({
      setup() {
        return createComponent(Child, {}, {}, () => [
          flag1.value
            ? [{ name: 'header', fn: () => template('header')() }]
            : [{ name: 'footer', fn: () => template('footer')() }],
        ])
      },
    })
    render()

    expect(instance.slots).toHaveProperty('header')
    flag1.value = false
    await nextTick()

    // expect(
    //   '[Vue warn]: Non-function value encountered for default slot. Prefer function slots for better performance.',
    // ).toHaveBeenWarned()

    expect(instance.slots).toHaveProperty('footer')
  })

  test('the current instance should be kept in the slot', async () => {
    let instanceInDefaultSlot: any
    let instanceInVForSlot: any
    let instanceInVIfSlot: any

    const Comp = defineComponent({
      render() {
        const instance = getCurrentInstance()
        instance!.slots.default!()
        instance!.slots.inVFor!()
        instance!.slots.inVIf!()
        return template('<div></div>')()
      },
    })

    const { instance } = define({
      render() {
        return createComponent(
          Comp,
          {},
          {
            default: () => {
              instanceInDefaultSlot = getCurrentInstance()
              return template('content')()
            },
          },
          () => [
            [
              {
                name: 'inVFor',
                fn: () => {
                  instanceInVForSlot = getCurrentInstance()
                  return template('content')()
                },
              },
            ],
            {
              name: 'inVIf',
              key: '1',
              fn: () => {
                instanceInVIfSlot = getCurrentInstance()
                return template('content')()
              },
            },
          ],
        )
      },
    }).render()

    expect(instanceInDefaultSlot).toBe(instance)
    expect(instanceInVForSlot).toBe(instance)
    expect(instanceInVIfSlot).toBe(instance)
  })

  test.todo('should respect $stable flag', async () => {
    // TODO: $stable flag?
  })

  test.todo('should not warn when mounting another app in setup', () => {
    // TODO: warning
    const Comp = defineComponent({
      render() {
        const i = getCurrentInstance()
        return i!.slots.default!()
      },
    })
    const mountComp = () => {
      createVaporApp({
        render() {
          return createComponent(
            Comp,
            {},
            { default: () => template('msg')() },
          )!
        },
      })
    }
    const App = {
      setup() {
        mountComp()
      },
      render() {
        return null!
      },
    }
    createVaporApp(App).mount(document.createElement('div'))
    expect(
      'Slot "default" invoked outside of the render function',
    ).not.toHaveBeenWarned()
  })

  describe('createSlot', () => {
    test('slot should be render correctly', () => {
      const Comp = defineComponent(() => {
        const n0 = template('<div></div>')()
        insert(createSlot('header'), n0 as any as ParentNode)
        return n0
      })

      const { host } = define(() => {
        return createComponent(Comp, {}, { header: () => template('header')() })
      }).render()

      expect(host.innerHTML).toBe('<div>header</div>')
    })

    test('slot should be render correctly with binds', async () => {
      const Comp = defineComponent(() => {
        const n0 = template('<div></div>')()
        insert(
          createSlot('header', { title: () => 'header' }),
          n0 as any as ParentNode,
        )
        return n0
      })

      const { host } = define(() => {
        return createComponent(
          Comp,
          {},
          {
            header: ({ title }) => {
              const el = template('<h1></h1>')()
              renderEffect(() => {
                setText(el, title())
              })
              return el
            },
          },
        )
      }).render()

      expect(host.innerHTML).toBe('<div><h1>header</h1></div>')
    })

    test('dynamic slot should be render correctly with binds', async () => {
      const Comp = defineComponent(() => {
        const n0 = template('<div></div>')()
        prepend(
          n0 as any as ParentNode,
          createSlot('header', { title: () => 'header' }),
        )
        return n0
      })

      const { host } = define(() => {
        // dynamic slot
        return createComponent(Comp, {}, {}, () => [
          { name: 'header', fn: ({ title }) => template(`${title()}`)() },
        ])
      }).render()

      expect(host.innerHTML).toBe('<div>header<!--slot--></div>')
    })

    test('dynamic slot outlet should be render correctly with binds', async () => {
      const Comp = defineComponent(() => {
        const n0 = template('<div></div>')()
        prepend(
          n0 as any as ParentNode,
          createSlot(
            () => 'header', // dynamic slot outlet name
            { title: () => 'header' },
          ),
        )
        return n0
      })

      const { host } = define(() => {
        return createComponent(
          Comp,
          {},
          { header: ({ title }) => template(`${title()}`)() },
        )
      }).render()

      expect(host.innerHTML).toBe('<div>header<!--slot--></div>')
    })

    test('fallback should be render correctly', () => {
      const Comp = defineComponent(() => {
        const n0 = template('<div></div>')()
        insert(
          createSlot('header', {}, () => template('fallback')()),
          n0 as any as ParentNode,
        )
        return n0
      })

      const { host } = define(() => {
        return createComponent(Comp, {}, {})
      }).render()

      expect(host.innerHTML).toBe('<div>fallback</div>')
    })

    test('dynamic slot should be updated correctly', async () => {
      const flag1 = ref(true)

      const Child = defineComponent(() => {
        const temp0 = template('<p></p>')
        const el0 = temp0()
        const el1 = temp0()
        const slot1 = createSlot('one', {}, () => template('one fallback')())
        const slot2 = createSlot('two', {}, () => template('two fallback')())
        insert(slot1, el0 as any as ParentNode)
        insert(slot2, el1 as any as ParentNode)
        return [el0, el1]
      })

      const { host } = define(() => {
        return createComponent(Child, {}, {}, () => [
          flag1.value
            ? { name: 'one', fn: () => template('one content')() }
            : { name: 'two', fn: () => template('two content')() },
        ])
      }).render()

      expect(host.innerHTML).toBe(
        '<p>one content<!--slot--></p><p>two fallback<!--slot--></p>',
      )

      flag1.value = false
      await nextTick()

      expect(host.innerHTML).toBe(
        '<p>one fallback<!--slot--></p><p>two content<!--slot--></p>',
      )

      flag1.value = true
      await nextTick()

      expect(host.innerHTML).toBe(
        '<p>one content<!--slot--></p><p>two fallback<!--slot--></p>',
      )
    })

    test('dynamic slot outlet should be updated correctly', async () => {
      const slotOutletName = ref('one')

      const Child = defineComponent(() => {
        const temp0 = template('<p></p>')
        const el0 = temp0()
        const slot1 = createSlot(
          () => slotOutletName.value,
          {},
          () => template('fallback')(),
        )
        insert(slot1, el0 as any as ParentNode)
        return el0
      })

      const { host } = define(() => {
        return createComponent(
          Child,
          {},
          {
            one: () => template('one content')(),
            two: () => template('two content')(),
          },
        )
      }).render()

      expect(host.innerHTML).toBe('<p>one content<!--slot--></p>')

      slotOutletName.value = 'two'
      await nextTick()

      expect(host.innerHTML).toBe('<p>two content<!--slot--></p>')

      slotOutletName.value = 'none'
      await nextTick()

      expect(host.innerHTML).toBe('<p>fallback<!--slot--></p>')
    })
  })
})