import { h, ref, toRefs, nextTick } from 'vue'
import { ElForm } from 'element-plus'
import { useFormProvide } from '../hooks/use-form'
import CipFormItem from '../cip-form-item'
import CipFormDirectory from './form-directory'
import CipFormLayout from '../cip-form-layout'
import { DRender } from '../helper/d-render'
import { toUpperFirstCase, getFieldValue } from '@cip/utils/util'
import CipMessage from '../cip-message'
import ElementClass from './element'
import scrollIntoView from 'scroll-into-view-if-needed'
import './index.less'
const dRender = new DRender()
export default {
  name: 'CipForm',
  props: {
    model: Object,
    fieldList: Array,
    showOnly: Boolean,
    modelKey: {
      type: [String, Function]
    },
    grid: { type: [Number, Boolean] }, // 是否开启grid布局
    useDirectory: Boolean,
    labelPosition: String,
    equipment: {
      type: String,
      default: 'pc',
      validate: (val) => ['pc', 'mobile'].includes(val)
    },
    isScrollError: {
      type: Boolean,
      default: true
    },
    border: Boolean, // showOnly + border 将出现边框
    enterHandler: Function, // 回车触发回调
    options: Object
  },
  emits: ['update:model', 'submit', 'cancel'],
  setup (props, context) {
    // 下发属性
    const uploadQueue = ref({})
    useFormProvide(props, uploadQueue)

    const directoryConfig = ref([])
    const { model, fieldList } = toRefs(props)
    const cipFormRef = ref()
    // 修改model的值
    const updateModel = (val) => {
      context.emit('update:model', val)
    }
    const generateComponentKey = (key) => {
      if (props.modelKey) {
        const appendKey = toUpperFirstCase(key)
        if (typeof props.modelKey === 'function') {
          return `${props.modelKey(props.model)}${appendKey}`
        } else {
          const value = getFieldValue(props.model, props.modelKey)
          return `${value || ''}${appendKey}`
        }
      } else {
        return key
      }
    }
    // 获取layout及item组件需要的props
    const getComponentProps = (key, config) => {
      const componentKey = generateComponentKey(key)
      const componentProps = {
        key: componentKey,
        componentKey: componentKey,
        model,
        fieldKey: key,
        config,
        readonly: props.showOnly,
        grid: props.grid,
        formLabelPosition: props.labelPosition,
        'onUpdate:model': (val) => {
          if (componentKey === generateComponentKey(key)) {
            updateModel(val)
          }
        }
      }
      if (props.enterHandler) {
        componentProps.onKeyup = (e) => {
          const { keyCode } = e
          if (keyCode === 13) {
            props.enterHandler()
          }
        }
      }
      return componentProps
    }
    // 布局字段渲染方式
    const getFormLayout = (componentProps) => {
      return h(CipFormLayout, {
        ...componentProps,
        onValidate: (cb) => {
          validate(cb)
        },
        onSubmit: () => {
          context.emit('submit')
        },
        onCancel: () => {
          context.emit('cancel')
        }
      }, {
        item: ({ children = [], isShow } = {}) => {
          return children.map((v) => getFormDefaultSlot(v, isShow))
        }
      })
    }
    // 输入字段渲染方式
    const getFormItem = (componentProps) => {
      return h(CipFormItem, componentProps)
    }
    // 渲染单个字段
    const getFormDefaultSlot = ({ key, config } = {}, isShow) => {
      // 若存在字段key值的插槽覆盖则配置整个ElFormItem
      config._isGrid = props.grid
      config._isShow = isShow
      if (context.slots[key]) {
        return context.slots[key]({ key, config })
      }
      const componentProps = getComponentProps(key, config)
      // 若存在字段key值+Input的插槽覆盖则配置ElFormItem内的Input
      if (context.slots[`${key}Input`]) {
        return h(CipFormItem, {
          ...componentProps,
          customSlots: context.slots[`${key}Input`]
        })
      }
      // 判断是否为布局类型的字段
      if (dRender.isLayoutType(config.type)) {
        // layout类型字段
        return getFormLayout(componentProps)
      } else {
        // input类型字段
        // 如果需要表单目录导航则添加
        if (config.directory) {
          directoryConfig.value[key] = { label: config.staticInfo || config.label, level: config.directory }
        }
        return getFormItem(componentProps)
      }
    }
    // 渲染表单
    const getFormDefaultSlots = () => {
      if (props.useDirectory) {
        return fieldList.value.map((v) => getFormDefaultSlot(v)).concat(
          [h(CipFormDirectory, { directory: directoryConfig.value })]
        )
      } else {
        return fieldList.value.map((v) => getFormDefaultSlot(v))
      }
    }

    /** start父组件通过ref调用方法 **/
    const validateUpload = () => {
      return new Promise((resolve, reject) => {
        const keys = Object.keys(uploadQueue.value)
        for (let i = 0; i < keys.length; i++) {
          const key = keys[i]
          if (uploadQueue.value[key]) {
            CipMessage.error('请等待文件上传', '提示')
            resolve(false)
            break
          }
        }
        resolve(true)
      })
    }
    const validateField = (props, cb) => {
      return cipFormRef.value.validateField(props, cb)
    }
    const validate = async (cb = () => {}) => {
      const isUpload = await validateUpload()
      if (!isUpload) {
        // eslint-disable-next-line standard/no-callback-literal
        cb(false)
        throw new Error('请等待文件上传')
      } else {
        // const res = await cipFormRef.value.validate() // 此方式返回的res为 true or false
        return new Promise((resolve, reject) => {
          cipFormRef.value.validate(async (isValid, invalidFields) => {
            // 自动定位到error项
            props.isScrollError && await scrollToField(null, props.options)
            if (typeof cb === 'function') cb(isValid, invalidFields)
            if (isValid) {
              resolve(isValid)
            } else {
              reject(isValid)
            }
          })
        })
        // console.log(res)
        // return await cipFormRef.value.validate(async (isValid, invalidFields) => {
        //   // 自动定位到error项
        //   props.isScrollError && await scrollToField(null, props.options)
        //   if (typeof cb === 'function') {
        //     cb(isValid, invalidFields)
        //   }
        // })
      }
    }
    const scrollToField = async (name, options = {}) => {
      await nextTick(() => {
        const elements = new ElementClass(cipFormRef.value.$el)
        // 加了name是手动定位，不检查是否验证通过
        // 自动定位到第一个未校验同通过项
        const target = name ? elements.getItemByName(name) : elements.getFirstErrorItem()
        // 原生scrollIntoView会导致整个页面滚动
        target && scrollIntoView(target, {
          scrollMode: 'if-needed',
          block: 'nearest',
          behavior: 'smooth',
          inline: 'nearest',
          ...options
        })
      })
    }
    const clearValidate = () => {
      return cipFormRef.value?.clearValidate()
    }

    context.expose({
      validateUpload,
      validateField,
      validate,
      clearValidate,
      scrollToField
    })
    /** end父组件通过ref调用方法 **/
    return () => h(ElForm, {
      ...context.attrs,
      ref: cipFormRef,
      hideRequiredAsterisk: true,
      model: model, // 待进行测试 使用model.value后数据是否正常
      class: ['cip-form', `cip-form--${props.equipment}`, { 'cip-form--grid': props.grid, 'cip-form--border': props.border && props.showOnly }],
      style: { gridTemplateColumns: `repeat(${typeof props.grid === 'number' ? props.grid : 3},1fr)` },
      size: 'small',
      labelPosition: props.labelPosition,
      onSubmit: ev => { ev.preventDefault() }
    }, { default: () => [getFormDefaultSlots(), context.slots.default?.()] })
  }
}