import { afterEach, describe, it, expect } from 'vitest'
import { h, nextTick, ref } from 'vue'
import { flushPromises, mount } from '@vue/test-utils'
import Form from '@/components/ui/form/form.vue'
import FormItem from '@/components/ui/form/form-item.vue'
import { resetUIConfig, setUIConfig, uiConfig } from '@/components/ui/config'

const model = () =>
  ref({
    code: 'a',
    name: 'b',
    note: 'c',
  })

function mountForm(columns = 1, extraProps = {}) {
  return mount(Form, {
    props: { model: model().value, columns, ...extraProps },
    slots: {
      default: () => [
        h(FormItem, { name: 'code', label: '编码' }, { default: () => h('input') }),
        h(FormItem, { name: 'name', label: '名称' }, { default: () => h('input') }),
        h(FormItem, { name: 'note', label: '备注', span: 2 }, { default: () => h('input') }),
      ],
    },
  })
}

describe('Form 多列网格布局', () => {
  it('columns=1 时保持原布局（无网格 class）', () => {
    const wrapper = mountForm()
    expect(wrapper.classes()).not.toContain('fms-form-grid')
    expect(wrapper.attributes('style')).toBeUndefined()
  })

  it('columns>1 时启用网格并生成列模板', () => {
    const wrapper = mountForm(2)
    expect(wrapper.classes()).toContain('fms-form-grid')
    expect(wrapper.element.style.gridTemplateColumns).toBe('repeat(2, minmax(0, 1fr))')
  })

  it('span>1 的 FormItem 跨列', () => {
    const wrapper = mountForm(2)
    const items = wrapper.findAllComponents(FormItem)
    const noteItem = items.find((i) => i.props('name') === 'note')
    expect(noteItem.element.style.gridColumn).toBe('span 2')
    const codeItem = items.find((i) => i.props('name') === 'code')
    expect(codeItem.element.style.gridColumn).toBe('')
  })

  it('span 超过列数时取整行', () => {
    const wrapper = mount(Form, {
      props: { model: model().value, columns: 3 },
      slots: {
        default: () => [
          h(FormItem, { name: 'code', label: '编码', span: 5 }, { default: () => h('input') }),
        ],
      },
    })
    const item = wrapper.findComponent(FormItem)
    expect(item.element.style.gridColumn).toBe('span 3')
  })

  it('maxWidth 数字按 px 处理', () => {
    const wrapper = mountForm(2, { maxWidth: 720 })
    expect(wrapper.element.style.maxWidth).toBe('720px')
  })

  it('vertical 布局下 label 在上', () => {
    const wrapper = mountForm(2, { layout: 'vertical' })
    const item = wrapper.findComponent(FormItem)
    expect(item.classes()).toContain('fms-form-item-vertical')
    expect(item.find('.fms-form-label-vertical').exists()).toBe(true)
  })
})

describe('Form 全局配置（uiConfig）', () => {
  afterEach(() => resetUIConfig())

  it('未传 layout 时取全局配置', () => {
    setUIConfig({ form: { layout: 'vertical' } })
    const wrapper = mountForm()
    expect(wrapper.classes()).toContain('fms-form-vertical')
    expect(wrapper.findComponent(FormItem).classes()).toContain('fms-form-item-vertical')
  })

  it('显式 layout 覆盖全局配置', () => {
    setUIConfig({ form: { layout: 'vertical' } })
    const wrapper = mountForm(1, { layout: 'horizontal' })
    expect(wrapper.classes()).toContain('fms-form-horizontal')
    expect(wrapper.findComponent(FormItem).classes()).not.toContain('fms-form-item-vertical')
  })

  it('setUIConfig 局部合并，未提及的键保持原值', () => {
    setUIConfig({ form: { labelAlign: 'left' } })
    expect(uiConfig.form.labelAlign).toBe('left')
    expect(uiConfig.form.layout).toBe('horizontal')
    setUIConfig({ form: { layout: 'vertical' } })
    expect(uiConfig.form.labelAlign).toBe('left')
  })

  it('全局 validateTrigger 生效：change 改为 blur 后值变化不立即报红', async () => {
    setUIConfig({ form: { validateTrigger: 'blur' } })
    const model = ref({ code: '' })
    const wrapper = mount(Form, {
      props: { model: model.value, rules: { code: [{ required: true, message: '必填' }] } },
      slots: {
        default: () => [
          h(FormItem, { name: 'code', label: '编码' }, { default: () => h('input') }),
        ],
      },
    })
    model.value.code = 'a'
    await nextTick()
    model.value.code = ''
    await nextTick()
    await flushPromises()
    expect(wrapper.findComponent(FormItem).classes()).not.toContain('fms-form-item-error')
  })

  it('独立使用的 FormItem（无 Form 包裹）也读全局 layout', () => {
    setUIConfig({ form: { layout: 'vertical' } })
    const wrapper = mount(FormItem, {
      props: { name: 'code', label: '编码' },
      slots: { default: () => h('input') },
    })
    expect(wrapper.classes()).toContain('fms-form-item-vertical')
  })
})

describe('Form 必填校验与 FormItem 错误展示', () => {
  function mountRequiredForm(rules, modelValue = { code: '' }) {
    const model = ref(modelValue)
    const wrapper = mount(Form, {
      props: { model: model.value, rules },
      slots: {
        default: () => [h(FormItem, { name: 'code', label: '编码' }, { default: () => h('input') })],
      },
    })
    return { wrapper, model }
  }

  it('必填为空时提交：FormItem 下方显示错误并标红', async () => {
    const { wrapper } = mountRequiredForm({ code: [{ required: true, message: '请填写编码' }] })
    await wrapper.find('form').trigger('submit')
    await flushPromises()
    const item = wrapper.findComponent(FormItem)
    expect(item.classes()).toContain('fms-form-item-error')
    const help = item.find('.fms-form-item-help-error')
    expect(help.exists()).toBe(true)
    expect(help.text()).toBe('请填写编码')
    expect(wrapper.emitted('submitFailed')).toHaveLength(1)
  })

  it('message 为函数时按校验时求值（动态文案）', async () => {
    const { wrapper } = mountRequiredForm({ code: [{ required: true, message: () => '请填写分类编码' }] })
    await wrapper.find('form').trigger('submit')
    await flushPromises()
    const help = wrapper.findComponent(FormItem).find('.fms-form-item-help-error')
    expect(help.text()).toBe('请填写分类编码')
  })

  it('validateAll 暴露并返回带错误的字段列表', async () => {
    const { wrapper } = mountRequiredForm({ code: [{ required: true, message: '请填写编码' }] })
    const errors = await wrapper.vm.validateAll()
    expect(errors).toHaveLength(1)
    expect(errors[0].name).toBe('code')
    expect(errors[0].errors).toEqual(['请填写编码'])
  })

  it('修正必填值后错误清除', async () => {
    const { wrapper, model } = mountRequiredForm({ code: [{ required: true, message: '请填写编码' }] })
    await wrapper.find('form').trigger('submit')
    await flushPromises()
    expect(wrapper.findComponent(FormItem).classes()).toContain('fms-form-item-error')
    model.value.code = 'abc'
    await nextTick()
    await flushPromises()
    const item = wrapper.findComponent(FormItem)
    expect(item.classes()).not.toContain('fms-form-item-error')
    expect(item.find('.fms-form-item-help-error').exists()).toBe(false)
  })
})