// @vitest-environment happy-dom

import { defineComponent } from 'vue'
import { flushPromises, mount } from '@vue/test-utils'
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import ExplainListPage from '@/pages/explain/list.vue'

const hostEnvironmentMocks = vi.hoisted(() => ({
  embeddedInWechatMiniProgram: false
}))

const testState = vi.hoisted(() => ({
  onLoadHandler: null as null | (() => void),
  onBackPressHandler: null as null | (() => boolean)
}))

vi.mock('@dcloudio/uni-app', () => ({
  onLoad: (handler: () => void) => {
    testState.onLoadHandler = handler
  },
  onBackPress: (handler: () => boolean) => {
    testState.onBackPressHandler = handler
  }
}))

vi.mock('@/utils/hostEnvironment', () => ({
  isEmbeddedInWechatMiniProgram: () => hostEnvironmentMocks.embeddedInWechatMiniProgram
}))

vi.mock('@/usecases/explainUseCase', () => ({
  explainUseCase: {
    loadExplainHalls: async () => [],
    loadExplainHallSummaries: async () => ({})
  }
}))

const GuidePageFrameStub = defineComponent({
  name: 'GuidePageFrame',
  emits: ['back'],
  template: '<main><button data-testid="frame-back" @click="$emit(\'back\')">顶部返回</button><slot /></main>'
})

const ExplainHallSelectStub = defineComponent({
  name: 'ExplainHallSelect',
  props: {
    forceInternalHeader: Boolean
  },
  emits: ['back'],
  template: '<button data-testid="explain-list-back" @click="$emit(\'back\')">返回</button>'
})

const mountExplainList = () => mount(ExplainListPage, {
  global: {
    stubs: {
      GuidePageFrame: GuidePageFrameStub,
      ExplainHallSelect: ExplainHallSelectStub
    }
  }
})

beforeEach(() => {
  hostEnvironmentMocks.embeddedInWechatMiniProgram = false
  testState.onLoadHandler = null
  testState.onBackPressHandler = null
  window.location.hash = '#/pages/explain/list'
  window.history.replaceState({}, '', window.location.href)
  vi.stubGlobal('uni', {
    navigateBack: vi.fn(),
    reLaunch: vi.fn(),
    showToast: vi.fn()
  })
  vi.stubGlobal('getCurrentPages', vi.fn(() => []))
})

afterEach(() => {
  vi.restoreAllMocks()
  vi.unstubAllGlobals()
})

describe('讲解展厅列表返回', () => {
  it('首页通过内部页面栈进入时，顶部返回使用 navigateBack 回到导览首页', async () => {
    vi.stubGlobal('getCurrentPages', vi.fn(() => [
      { route: 'pages/index/index', options: { tab: 'guide' } },
      { route: 'pages/explain/list', options: {} }
    ]))
    const wrapper = mountExplainList()
    testState.onLoadHandler?.()
    await flushPromises()

    await wrapper.get('[data-testid="frame-back"]').trigger('click')

    expect(uni.navigateBack).toHaveBeenCalledWith(expect.objectContaining({ delta: 1 }))
    expect(uni.reLaunch).not.toHaveBeenCalled()
    wrapper.unmount()
  })

  it('页面栈只有展厅列表时使用 reLaunch 回到导览首页', async () => {
    const wrapper = mountExplainList()

    await wrapper.get('[data-testid="explain-list-back"]').trigger('click')

    expect(uni.navigateBack).not.toHaveBeenCalled()
    expect(uni.reLaunch).toHaveBeenCalledWith(expect.objectContaining({
      url: '/pages/index/index?tab=guide'
    }))
    wrapper.unmount()
  })

  it('独立页在微信嵌入态强制提供 H5 返回，并保留宿主识别参数', async () => {
    hostEnvironmentMocks.embeddedInWechatMiniProgram = true
    window.location.hash = '#/pages/explain/list?embedded=wechat-mini-program&weapp=1'
    window.history.replaceState({}, '', window.location.href)
    const wrapper = mountExplainList()

    expect(wrapper.getComponent(ExplainHallSelectStub).props('forceInternalHeader')).toBe(true)
    await wrapper.get('[data-testid="explain-list-back"]').trigger('click')

    expect(uni.navigateBack).not.toHaveBeenCalled()
    expect(uni.reLaunch).toHaveBeenCalledWith(expect.objectContaining({
      url: '/pages/index/index?tab=guide&embedded=wechat-mini-program&weapp=1'
    }))
    wrapper.unmount()
  })

  it('上一页不是首页时使用 reLaunch，避免回到不相关页面', async () => {
    vi.stubGlobal('getCurrentPages', vi.fn(() => [
      { route: 'pages/search/index', options: {} },
      { route: 'pages/explain/list', options: {} }
    ]))
    const wrapper = mountExplainList()

    await wrapper.get('[data-testid="explain-list-back"]').trigger('click')

    expect(uni.navigateBack).not.toHaveBeenCalled()
    expect(uni.reLaunch).toHaveBeenCalledWith(expect.objectContaining({
      url: '/pages/index/index?tab=guide'
    }))
    wrapper.unmount()
  })

  it('上一页是首页但不是导览 Tab 时重启到导览首页', async () => {
    vi.stubGlobal('getCurrentPages', vi.fn(() => [
      { route: 'pages/index/index', options: { tab: 'explain' } },
      { route: 'pages/explain/list', options: {} }
    ]))
    const wrapper = mountExplainList()

    await wrapper.get('[data-testid="explain-list-back"]').trigger('click')

    expect(uni.navigateBack).not.toHaveBeenCalled()
    expect(uni.reLaunch).toHaveBeenCalledWith(expect.objectContaining({
      url: '/pages/index/index?tab=guide'
    }))
    wrapper.unmount()
  })

  it('navigateBack 失败后重启到导览首页', async () => {
    vi.stubGlobal('getCurrentPages', vi.fn(() => [
      { route: 'pages/index/index', options: { tab: 'guide' } },
      { route: 'pages/explain/list', options: {} }
    ]))
    vi.stubGlobal('uni', {
      navigateBack: vi.fn((options: { fail?: () => void }) => options.fail?.()),
      reLaunch: vi.fn(),
      showToast: vi.fn()
    })
    const wrapper = mountExplainList()

    await wrapper.get('[data-testid="explain-list-back"]').trigger('click')

    expect(uni.reLaunch).toHaveBeenCalledWith(expect.objectContaining({
      url: '/pages/index/index?tab=guide'
    }))
    wrapper.unmount()
  })

  it('重启导览首页失败时显示明确提示', async () => {
    vi.stubGlobal('uni', {
      navigateBack: vi.fn(),
      reLaunch: vi.fn((options: { fail?: () => void }) => options.fail?.()),
      showToast: vi.fn()
    })
    const wrapper = mountExplainList()

    await wrapper.get('[data-testid="explain-list-back"]').trigger('click')

    expect(uni.showToast).toHaveBeenCalledWith({
      title: '返回导览首页失败，请重试',
      icon: 'none'
    })
    wrapper.unmount()
  })

  it('根栈只创建一条历史标记，浏览器返回会回到导览首页', async () => {
    hostEnvironmentMocks.embeddedInWechatMiniProgram = true
    window.location.hash = '#/pages/explain/list?embedded=wechat-mini-program&weapp=1'
    window.history.replaceState({}, '', window.location.href)
    const wrapper = mountExplainList()
    const pushState = vi.spyOn(window.history, 'pushState')
    testState.onLoadHandler?.()
    testState.onLoadHandler?.()
    await flushPromises()

    window.dispatchEvent(new PopStateEvent('popstate', { state: {} }))
    await flushPromises()

    expect(uni.navigateBack).not.toHaveBeenCalled()
    expect(pushState).toHaveBeenCalledTimes(1)
    const url = vi.mocked(uni.reLaunch).mock.calls[0]?.[0]?.url || ''
    const query = new URLSearchParams(url.split('?')[1])
    expect(url.split('?')[0]).toBe('/pages/index/index')
    expect(query.get('tab')).toBe('guide')
    expect(query.get('embedded')).toBe('wechat-mini-program')
    expect(query.get('weapp')).toBe('1')
    wrapper.unmount()
  })

  it('普通 H5 浏览器返回也会回到导览首页，且不调用 history.back', async () => {
    const historyBack = vi.spyOn(window.history, 'back')
    const wrapper = mountExplainList()
    testState.onLoadHandler?.()

    window.dispatchEvent(new PopStateEvent('popstate', { state: {} }))
    await flushPromises()

    expect(uni.reLaunch).toHaveBeenCalledWith(expect.objectContaining({
      url: '/pages/index/index?tab=guide'
    }))
    expect(historyBack).not.toHaveBeenCalled()
    wrapper.unmount()
  })

  it('正常内部页面栈不创建历史标记，并保留框架原有浏览器返回', async () => {
    vi.stubGlobal('getCurrentPages', vi.fn(() => [
      { route: 'pages/index/index', options: { tab: 'guide' } },
      { route: 'pages/explain/list', options: {} }
    ]))
    const wrapper = mountExplainList()
    const pushState = vi.spyOn(window.history, 'pushState')
    testState.onLoadHandler?.()

    window.dispatchEvent(new PopStateEvent('popstate', { state: {} }))
    await flushPromises()

    expect(pushState).not.toHaveBeenCalled()
    expect(uni.reLaunch).not.toHaveBeenCalled()
    wrapper.unmount()
  })

  it('平台返回事件复用同一返回策略并阻止默认退出', () => {
    const wrapper = mountExplainList()

    expect(testState.onBackPressHandler?.()).toBe(true)
    expect(uni.reLaunch).toHaveBeenCalledWith(expect.objectContaining({
      url: '/pages/index/index?tab=guide'
    }))
    wrapper.unmount()
  })
})