import { ref, isRef, reactive, isReactive, toRaw, markRaw, computed } from 'v3'
import { set } from 'core/observer'
import { effect } from 'v3/reactivity/effect'

describe('reactivity/reactive', () => {
  test('Object', () => {
    const original = { foo: 1 }
    const observed = reactive(original)
    // @discrepancy Vue 2 does not create proxy objects
    // expect(observed).not.toBe(original)
    expect(isReactive(observed)).toBe(true)
    // @discrepancy Vue 2 does not create proxy objects
    // expect(isReactive(original)).toBe(false)
    // get
    expect(observed.foo).toBe(1)
    // has
    expect('foo' in observed).toBe(true)
    // ownKeys
    expect(Object.keys(observed)).toEqual(['foo'])
  })

  test('proto', () => {
    const obj = {}
    const reactiveObj = reactive(obj)
    expect(isReactive(reactiveObj)).toBe(true)
    // read prop of reactiveObject will cause reactiveObj[prop] to be reactive
    // @ts-ignore
    const prototype = reactiveObj['__proto__']
    const otherObj = { data: ['a'] }
    expect(isReactive(otherObj)).toBe(false)
    const reactiveOther = reactive(otherObj)
    expect(isReactive(reactiveOther)).toBe(true)
    expect(reactiveOther.data[0]).toBe('a')
  })

  test('nested reactives', () => {
    const original = {
      nested: {
        foo: 1
      },
      array: [{ bar: 2 }]
    }
    const observed = reactive(original)
    expect(isReactive(observed.nested)).toBe(true)
    expect(isReactive(observed.array)).toBe(true)
    expect(isReactive(observed.array[0])).toBe(true)
  })

  // @discrepancy Vue 2 does not support collections
  // test('observing subtypes of IterableCollections(Map, Set)', () => {
  //   // subtypes of Map
  //   class CustomMap extends Map {}
  //   const cmap = reactive(new CustomMap())

  //   expect(cmap instanceof Map).toBe(true)
  //   expect(isReactive(cmap)).toBe(true)

  //   cmap.set('key', {})
  //   expect(isReactive(cmap.get('key'))).toBe(true)

  //   // subtypes of Set
  //   class CustomSet extends Set {}
  //   const cset = reactive(new CustomSet())

  //   expect(cset instanceof Set).toBe(true)
  //   expect(isReactive(cset)).toBe(true)

  //   let dummy
  //   effect(() => (dummy = cset.has('value')))
  //   expect(dummy).toBe(false)
  //   cset.add('value')
  //   expect(dummy).toBe(true)
  //   cset.delete('value')
  //   expect(dummy).toBe(false)
  // })

  // test('observing subtypes of WeakCollections(WeakMap, WeakSet)', () => {
  //   // subtypes of WeakMap
  //   class CustomMap extends WeakMap {}
  //   const cmap = reactive(new CustomMap())

  //   expect(cmap instanceof WeakMap).toBe(true)
  //   expect(isReactive(cmap)).toBe(true)

  //   const key = {}
  //   cmap.set(key, {})
  //   expect(isReactive(cmap.get(key))).toBe(true)

  //   // subtypes of WeakSet
  //   class CustomSet extends WeakSet {}
  //   const cset = reactive(new CustomSet())

  //   expect(cset instanceof WeakSet).toBe(true)
  //   expect(isReactive(cset)).toBe(true)

  //   let dummy
  //   effect(() => (dummy = cset.has(key)))
  //   expect(dummy).toBe(false)
  //   cset.add(key)
  //   expect(dummy).toBe(true)
  //   cset.delete(key)
  //   expect(dummy).toBe(false)
  // })

  test('observed value should proxy mutations to original (Object)', () => {
    const original: any = { foo: 1 }
    const observed = reactive(original)
    // set
    observed.bar = 1
    expect(observed.bar).toBe(1)
    expect(original.bar).toBe(1)
    // delete
    delete observed.foo
    expect('foo' in observed).toBe(false)
    expect('foo' in original).toBe(false)
  })

  test('original value change should reflect in observed value (Object)', () => {
    const original: any = { foo: 1 }
    const observed = reactive(original)
    // set
    original.bar = 1
    expect(original.bar).toBe(1)
    expect(observed.bar).toBe(1)
    // delete
    delete original.foo
    expect('foo' in original).toBe(false)
    expect('foo' in observed).toBe(false)
  })

  test('setting a property with an unobserved value should wrap with reactive', () => {
    const observed = reactive<{ foo?: object }>({})
    const raw = {}
    set(observed, 'foo', raw)
    // @discrepancy not a proxy
    // expect(observed.foo).not.toBe(raw)
    expect(isReactive(observed.foo)).toBe(true)
  })

  test('observing already observed value should return same Proxy', () => {
    const original = { foo: 1 }
    const observed = reactive(original)
    const observed2 = reactive(observed)
    expect(observed2).toBe(observed)
  })

  test('observing the same value multiple times should return same Proxy', () => {
    const original = { foo: 1 }
    const observed = reactive(original)
    const observed2 = reactive(original)
    expect(observed2).toBe(observed)
  })

  test('should not pollute original object with Proxies', () => {
    const original: any = { foo: 1 }
    const original2 = { bar: 2 }
    const observed = reactive(original)
    const observed2 = reactive(original2)
    observed.bar = observed2
    expect(observed.bar).toBe(observed2)
    expect(original.bar).toBe(original2)
  })

  test('toRaw', () => {
    const original = { foo: 1 }
    const observed = reactive(original)
    expect(toRaw(observed)).toBe(original)
    expect(toRaw(original)).toBe(original)
  })

  test('toRaw on object using reactive as prototype', () => {
    const original = reactive({})
    const obj = Object.create(original)
    const raw = toRaw(obj)
    expect(raw).toBe(obj)
    expect(raw).not.toBe(toRaw(original))
  })

  test('should not unwrap Ref<T>', () => {
    const observedNumberRef = reactive(ref(1))
    const observedObjectRef = reactive(ref({ foo: 1 }))

    expect(isRef(observedNumberRef)).toBe(true)
    expect(isRef(observedObjectRef)).toBe(true)
  })

  test('should unwrap computed refs', () => {
    // readonly
    const a = computed(() => 1)
    // writable
    const b = computed({
      get: () => 1,
      set: () => {}
    })
    const obj = reactive({ a, b })
    // check type
    obj.a + 1
    obj.b + 1
    expect(typeof obj.a).toBe(`number`)
    expect(typeof obj.b).toBe(`number`)
  })

  test('should allow setting property from a ref to another ref', () => {
    const foo = ref(0)
    const bar = ref(1)
    const observed = reactive({ a: foo })
    let dummy
    effect(() => {
      dummy = observed.a
    })
    expect(dummy).toBe(0)

    // @ts-ignore
    observed.a = bar
    expect(dummy).toBe(1)

    bar.value++
    expect(dummy).toBe(2)
  })

  test('non-observable values', () => {
    const assertValue = (value: any) => {
      reactive(value)
      expect(
        `value cannot be made reactive: ${String(value)}`
      ).toHaveBeenWarnedLast()
    }

    // number
    assertValue(1)
    // string
    assertValue('foo')
    // boolean
    assertValue(false)
    // null
    assertValue(null)
    // undefined
    assertValue(undefined)
    // symbol
    const s = Symbol()
    assertValue(s)

    // built-ins should work and return same value
    const p = Promise.resolve()
    expect(reactive(p)).toBe(p)
    const r = new RegExp('')
    expect(reactive(r)).toBe(r)
    const d = new Date()
    expect(reactive(d)).toBe(d)
  })

  test('markRaw', () => {
    const obj = reactive({
      foo: { a: 1 },
      bar: markRaw({ b: 2 })
    })
    expect(isReactive(obj.foo)).toBe(true)
    expect(isReactive(obj.bar)).toBe(false)
  })

  test('markRaw on non-extensible objects', () => {
    const foo = Object.seal({})
    markRaw(foo)
    expect(isReactive(reactive(foo))).toBe(false)
  })

  test('should not observe non-extensible objects', () => {
    const obj = reactive({
      foo: Object.preventExtensions({ a: 1 }),
      // sealed or frozen objects are considered non-extensible as well
      bar: Object.freeze({ a: 1 }),
      baz: Object.seal({ a: 1 })
    })
    expect(isReactive(obj.foo)).toBe(false)
    expect(isReactive(obj.bar)).toBe(false)
    expect(isReactive(obj.baz)).toBe(false)
  })

  test('should not observe objects with __v_skip', () => {
    const original = {
      foo: 1,
      __v_skip: true
    }
    const observed = reactive(original)
    expect(isReactive(observed)).toBe(false)
  })

  // #12595
  test(`should not trigger if value didn't change`, () => {
    const state = reactive({
      foo: 1
    })
    const spy = vi.fn()
    effect(() => {
      state.foo
      spy()
    })
    expect(spy).toHaveBeenCalledTimes(1)

    state.foo = 1
    expect(spy).toHaveBeenCalledTimes(1)

    state.foo = NaN
    expect(spy).toHaveBeenCalledTimes(2)

    state.foo = NaN
    expect(spy).toHaveBeenCalledTimes(2)

    state.foo = 2
    expect(spy).toHaveBeenCalledTimes(3)
  })
})