import { describe, expect, test, it } from 'vitest'
import Emitter from '../lib/core/emit'

describe('Emitter', () => {
  function testOptions(options) {
    const emitter = Emitter(options)

    for (const key in options) {
      if (options[key]) {
        it(`enable options.${key}`, () => {
          expect(emitter.$plugins).toHaveProperty(key)
        })
      } else {
        it(`no enable options.${key}`, () => {
          expect(emitter.$plugins).not.toHaveProperty(key)
        })
      }
    }
  }

  describe('options 配置启用插件验证', () => {
    testOptions({
      replay: true,
      logger: false,
      cross: true,
      customEvent: true
    })

    testOptions({
      replay: false,
      logger: true,
      cross: false,
      customEvent: false
    })
  })

  describe('注册插件验证', () => {
    it('options.plugins 自定义注册插件验证', () => {
      const pluginName = 'addPlugin'
      const emitter = Emitter({
        plugins: [
          {
            name: pluginName,
            use() {
              expect(true).toBe(true)
            }
          }
        ],
        replay: false,
        logger: false,
        cross: false,
        customEvent: false
      })
      expect(emitter.$plugins).toHaveProperty(pluginName)
    })

    it('use 自定义注册插件验证', () => {
      const pluginName = 'addPlugin'
      const emitter = Emitter({
        replay: false,
        logger: false,
        cross: false,
        customEvent: false
      })
      emitter.use({
        name: pluginName,
        use() {
          expect(true).toBe(true)
        }
      })
      expect(emitter.$plugins).toHaveProperty(pluginName)
    })

    it('重复注册插件拦截验证', () => {
      const emitter = Emitter({
        replay: true,
        logger: false,
        cross: false,
        customEvent: false
      })
      expect(() => {
        return emitter.use({
          name: 'replay',
          use() {
            expect(false).toBe(true)
          }
        })
      }).toThrowError('Plugin')
    })
  })

  describe('插件 replay 功能验证', () => {
    test('$emit(..., { replay: true }) 重放功能验证', () => {
      const emitter = Emitter({
        replay: true,
        logger: false,
        cross: false,
        customEvent: false
      })
      const testContent = 'test-replay'
      let result = null

      emitter.$emit(testContent, testContent, { replay: true })
      emitter.$on(testContent, (event, expands) => {
        result = event
        expect(expands.replay).toBe(true)
        expect(expands.fromReplay).toBe(true)
      })
      expect(result).toBe(testContent)
      emitter.$off(testContent)
    })

    describe('$on(..., { replay: false }) 禁用重放功能验证', () => {
      const emitter = Emitter({
        replay: true,
        logger: false,
        cross: false,
        customEvent: false
      })
      const testContent = 'test-replay'
      let result = null

      emitter.$emit(testContent, testContent, { replay: true })
      emitter.$on(
        testContent,
        (event, expands = {}) => {
          result = event
          expect(expands.replay).not.toBe(true)
          expect(expands.fromReplay).not.toBe(true)
        },
        {
          replay: false
        }
      )
      it('设置 replay: false 后不触发 handler', () => {
        expect(result).toBe(null)
      })

      it('正常触发后续 $emit handler', () => {
        emitter.$emit(testContent, testContent)
        expect(result).toBe(testContent)
      })
    })
  })

  describe('插件 customEvent 功能验证', () => {
    const realEventName = 'custom-event-emitter'

    function commonTest(testContent, event, expands, type) {
      test('应该正常获取 event， type', () => {
        expect(type).toBe(testContent)
        expect(event).toBe(testContent)
      })
      test('[*] expands.customEvent === true', () => {
        expect(expands.customEvent).toBe(true)
      })

      test('[!] expands.fromCustomEvent === undefined', () => {
        expect(expands.fromCustomEvent).toBe(undefined)
      })
    }

    describe('$emit(..., { customEvent: true }) 发送及 $on 附加参数 功能验证', () => {
      const emitter = Emitter({
        replay: false,
        logger: false,
        cross: false,
        customEvent: true
      })
      const testContent = 'test-custom-event'

      emitter.$on(testContent, (...args) => {
        commonTest(testContent, ...args)
      })
      emitter.$emit(testContent, testContent, { customEvent: true })
      emitter.$off(testContent)
    })

    describe('window.addEventListener 接收 $emit(...) 发送  功能验证', () => {
      const emitter = Emitter({
        replay: false,
        logger: false,
        cross: false,
        customEvent: true
      })
      const testContent = 'test-custom-event-listeners'
      let result = 0
      const handler = (e) => {
        result++
        const { type, event, expands } = e.detail
        if (type !== '*') {
          commonTest(testContent, event, expands, type)
        }
      }
      window.addEventListener(realEventName, handler)

      emitter.$emit(testContent, testContent, { customEvent: true })

      test('应该触发两次 handler [*, type]', () => {
        expect(result).toBe(2)
      })
      window.removeEventListener(realEventName, handler)
    })

    describe('window.dispatchEvent 发送 $on(...) 接收  功能验证', () => {
      const emitter = Emitter({
        replay: false,
        logger: false,
        cross: false,
        customEvent: true
      })
      const testContent = 'test-custom-event-dispatchEvent'

      emitter.$on(testContent, (event, expands, type) => {
        test('应该正常获取 event， type', () => {
          expect(type).toBe(testContent)
          expect(event).toBe(testContent)
        })
        test('[!] expands.customEvent === undefined', () => {
          expect(expands.customEvent).toBe(undefined)
        })

        test('[*] expands.fromCustomEvent === true', () => {
          expect(expands.fromCustomEvent).toBe(true)
        })
      })

      window.dispatchEvent(
        new CustomEvent(realEventName, {
          detail: {
            type: testContent,
            event: testContent,
            expands: {}
          }
        })
      )

      emitter.$off(testContent)
    })
  })
})