import { reactive, effect, isReactive, toRaw } from '../../src'
import { mockWarn } from '@vue/shared'

describe('reactivity/collections', () => {
  describe('Set', () => {
    mockWarn()

    it('instanceof', () => {
      const original = new Set()
      const observed = reactive(original)
      expect(isReactive(observed)).toBe(true)
      expect(original instanceof Set).toBe(true)
      expect(observed instanceof Set).toBe(true)
    })

    it('should observe mutations', () => {
      let dummy
      const set = reactive(new Set())
      effect(() => (dummy = set.has('value')))

      expect(dummy).toBe(false)
      set.add('value')
      expect(dummy).toBe(true)
      set.delete('value')
      expect(dummy).toBe(false)
    })

    it('should observe mutations with observed value', () => {
      let dummy
      const value = reactive({})
      const set = reactive(new Set())
      effect(() => (dummy = set.has(value)))

      expect(dummy).toBe(false)
      set.add(value)
      expect(dummy).toBe(true)
      set.delete(value)
      expect(dummy).toBe(false)
    })

    it('should observe for of iteration', () => {
      let dummy
      const set = reactive(new Set() as Set<number>)
      effect(() => {
        dummy = 0
        for (let num of set) {
          dummy += num
        }
      })

      expect(dummy).toBe(0)
      set.add(2)
      set.add(1)
      expect(dummy).toBe(3)
      set.delete(2)
      expect(dummy).toBe(1)
      set.clear()
      expect(dummy).toBe(0)
    })

    it('should observe forEach iteration', () => {
      let dummy: any
      const set = reactive(new Set())
      effect(() => {
        dummy = 0
        set.forEach(num => (dummy += num))
      })

      expect(dummy).toBe(0)
      set.add(2)
      set.add(1)
      expect(dummy).toBe(3)
      set.delete(2)
      expect(dummy).toBe(1)
      set.clear()
      expect(dummy).toBe(0)
    })

    it('should observe values iteration', () => {
      let dummy
      const set = reactive(new Set() as Set<number>)
      effect(() => {
        dummy = 0
        for (let num of set.values()) {
          dummy += num
        }
      })

      expect(dummy).toBe(0)
      set.add(2)
      set.add(1)
      expect(dummy).toBe(3)
      set.delete(2)
      expect(dummy).toBe(1)
      set.clear()
      expect(dummy).toBe(0)
    })

    it('should observe keys iteration', () => {
      let dummy
      const set = reactive(new Set() as Set<number>)
      effect(() => {
        dummy = 0
        for (let num of set.keys()) {
          dummy += num
        }
      })

      expect(dummy).toBe(0)
      set.add(2)
      set.add(1)
      expect(dummy).toBe(3)
      set.delete(2)
      expect(dummy).toBe(1)
      set.clear()
      expect(dummy).toBe(0)
    })

    it('should observe entries iteration', () => {
      let dummy
      const set = reactive(new Set<number>())
      effect(() => {
        dummy = 0
        // eslint-disable-next-line no-unused-vars
        for (let [key, num] of set.entries()) {
          key
          dummy += num
        }
      })

      expect(dummy).toBe(0)
      set.add(2)
      set.add(1)
      expect(dummy).toBe(3)
      set.delete(2)
      expect(dummy).toBe(1)
      set.clear()
      expect(dummy).toBe(0)
    })

    it('should be triggered by clearing', () => {
      let dummy
      const set = reactive(new Set())
      effect(() => (dummy = set.has('key')))

      expect(dummy).toBe(false)
      set.add('key')
      expect(dummy).toBe(true)
      set.clear()
      expect(dummy).toBe(false)
    })

    it('should not observe custom property mutations', () => {
      let dummy
      const set: any = reactive(new Set())
      effect(() => (dummy = set.customProp))

      expect(dummy).toBe(undefined)
      set.customProp = 'Hello World'
      expect(dummy).toBe(undefined)
    })

    it('should observe size mutations', () => {
      let dummy
      const set = reactive(new Set())
      effect(() => (dummy = set.size))

      expect(dummy).toBe(0)
      set.add('value')
      set.add('value2')
      expect(dummy).toBe(2)
      set.delete('value')
      expect(dummy).toBe(1)
      set.clear()
      expect(dummy).toBe(0)
    })

    it('should not observe non value changing mutations', () => {
      let dummy
      const set = reactive(new Set())
      const setSpy = jest.fn(() => (dummy = set.has('value')))
      effect(setSpy)

      expect(dummy).toBe(false)
      expect(setSpy).toHaveBeenCalledTimes(1)
      set.add('value')
      expect(dummy).toBe(true)
      expect(setSpy).toHaveBeenCalledTimes(2)
      set.add('value')
      expect(dummy).toBe(true)
      expect(setSpy).toHaveBeenCalledTimes(2)
      set.delete('value')
      expect(dummy).toBe(false)
      expect(setSpy).toHaveBeenCalledTimes(3)
      set.delete('value')
      expect(dummy).toBe(false)
      expect(setSpy).toHaveBeenCalledTimes(3)
      set.clear()
      expect(dummy).toBe(false)
      expect(setSpy).toHaveBeenCalledTimes(3)
    })

    it('should not observe raw data', () => {
      let dummy
      const set = reactive(new Set())
      effect(() => (dummy = toRaw(set).has('value')))

      expect(dummy).toBe(false)
      set.add('value')
      expect(dummy).toBe(false)
    })

    it('should not observe raw iterations', () => {
      let dummy = 0
      const set = reactive(new Set<number>())
      effect(() => {
        dummy = 0
        for (let [num] of toRaw(set).entries()) {
          dummy += num
        }
        for (let num of toRaw(set).keys()) {
          dummy += num
        }
        for (let num of toRaw(set).values()) {
          dummy += num
        }
        toRaw(set).forEach(num => {
          dummy += num
        })
        for (let num of toRaw(set)) {
          dummy += num
        }
      })

      expect(dummy).toBe(0)
      set.add(2)
      set.add(3)
      expect(dummy).toBe(0)
      set.delete(2)
      expect(dummy).toBe(0)
    })

    it('should not be triggered by raw mutations', () => {
      let dummy
      const set = reactive(new Set())
      effect(() => (dummy = set.has('value')))

      expect(dummy).toBe(false)
      toRaw(set).add('value')
      expect(dummy).toBe(false)
      dummy = true
      toRaw(set).delete('value')
      expect(dummy).toBe(true)
      toRaw(set).clear()
      expect(dummy).toBe(true)
    })

    it('should not observe raw size mutations', () => {
      let dummy
      const set = reactive(new Set())
      effect(() => (dummy = toRaw(set).size))

      expect(dummy).toBe(0)
      set.add('value')
      expect(dummy).toBe(0)
    })

    it('should not be triggered by raw size mutations', () => {
      let dummy
      const set = reactive(new Set())
      effect(() => (dummy = set.size))

      expect(dummy).toBe(0)
      toRaw(set).add('value')
      expect(dummy).toBe(0)
    })

    it('should support objects as key', () => {
      let dummy
      const key = {}
      const set = reactive(new Set())
      const setSpy = jest.fn(() => (dummy = set.has(key)))
      effect(setSpy)

      expect(dummy).toBe(false)
      expect(setSpy).toHaveBeenCalledTimes(1)

      set.add({})
      expect(dummy).toBe(false)
      expect(setSpy).toHaveBeenCalledTimes(1)

      set.add(key)
      expect(dummy).toBe(true)
      expect(setSpy).toHaveBeenCalledTimes(2)
    })

    it('should not pollute original Set with Proxies', () => {
      const set = new Set()
      const observed = reactive(set)
      const value = reactive({})
      observed.add(value)
      expect(observed.has(value)).toBe(true)
      expect(set.has(value)).toBe(false)
    })

    it('should observe nested values in iterations (forEach)', () => {
      const set = reactive(new Set([{ foo: 1 }]))
      let dummy: any
      effect(() => {
        dummy = 0
        set.forEach(value => {
          expect(isReactive(value)).toBe(true)
          dummy += value.foo
        })
      })
      expect(dummy).toBe(1)
      set.forEach(value => {
        value.foo++
      })
      expect(dummy).toBe(2)
    })

    it('should observe nested values in iterations (values)', () => {
      const set = reactive(new Set([{ foo: 1 }]))
      let dummy: any
      effect(() => {
        dummy = 0
        for (const value of set.values()) {
          expect(isReactive(value)).toBe(true)
          dummy += value.foo
        }
      })
      expect(dummy).toBe(1)
      set.forEach(value => {
        value.foo++
      })
      expect(dummy).toBe(2)
    })

    it('should observe nested values in iterations (entries)', () => {
      const set = reactive(new Set([{ foo: 1 }]))
      let dummy: any
      effect(() => {
        dummy = 0
        for (const [key, value] of set.entries()) {
          expect(isReactive(key)).toBe(true)
          expect(isReactive(value)).toBe(true)
          dummy += value.foo
        }
      })
      expect(dummy).toBe(1)
      set.forEach(value => {
        value.foo++
      })
      expect(dummy).toBe(2)
    })

    it('should observe nested values in iterations (for...of)', () => {
      const set = reactive(new Set([{ foo: 1 }]))
      let dummy: any
      effect(() => {
        dummy = 0
        for (const value of set) {
          expect(isReactive(value)).toBe(true)
          dummy += value.foo
        }
      })
      expect(dummy).toBe(1)
      set.forEach(value => {
        value.foo++
      })
      expect(dummy).toBe(2)
    })

    it('should work with reactive entries in raw set', () => {
      const raw = new Set()
      const entry = reactive({})
      raw.add(entry)
      const set = reactive(raw)

      expect(set.has(entry)).toBe(true)

      expect(set.delete(entry)).toBe(true)
      expect(set.has(entry)).toBe(false)
    })

    it('should track deletion of reactive entries in raw set', () => {
      const raw = new Set()
      const entry = reactive({})
      raw.add(entry)
      const set = reactive(raw)

      let dummy
      effect(() => {
        dummy = set.has(entry)
      })
      expect(dummy).toBe(true)

      set.delete(entry)
      expect(dummy).toBe(false)
    })

    it('should warn when set contains both raw and reactive versions of the same object', () => {
      const raw = new Set()
      const rawKey = {}
      const key = reactive(rawKey)
      raw.add(rawKey)
      raw.add(key)
      const set = reactive(raw)
      set.delete(key)
      expect(
        `Reactive Set contains both the raw and reactive`
      ).toHaveBeenWarned()
    })
    
    it('thisArg', () => {
      const raw = new Set([ 'value' ])
      const proxy = reactive(raw)
      const thisArg = {}
      let count = 0
      proxy.forEach(function (this :{}, value, _, set) {
        ++count
        expect(this).toBe(thisArg)
        expect(value).toBe('value')
        expect(set).toBe(proxy)
      }, thisArg)
      expect(count).toBe(1)
    })
  })
})