import { defineComponent, markRaw, ref } from 'vue'
import { ElDialog, ElButton } from 'element-plus'
import { componentScheme } from './component.scheme'
import { generateProps, generateEmits } from '../helper/component-util'
import './dialog.less'
export default defineComponent({
  name: 'CipDialog',
  props: generateProps(componentScheme),
  emits: generateEmits(componentScheme),
  setup (props, { slots, emit }) {
    const defaultSlot = ref([])
    const isComponent = vnode => !!vnode.component
    const isFormComponent = (vnode) => {
      if (!isComponent(vnode)) return false
      const componentName = (vnode.type?.name ?? '').toLocaleLowerCase()
      return componentName.indexOf('form') > -1
    }
    const getComponent = vnode => vnode?.component
    const getMethodByComponent = (component = {}, method) => component.ctx?.[method] ?? component.exposed?.[method]
    const clearValidate = (vnodeList = []) => {
      // eslint-disable-next-line no-unused-expressions
      const handler = (component) => {
        const clearValidate = getMethodByComponent(component, 'clearValidate')
        // eslint-disable-next-line no-unused-expressions
       clearValidate?.()
      }
      findFormAndHandler(vnodeList, handler).then(() => {})
    }
    const validForms = async (vnodeList = []) => {
      const validList = []
      const handler = async (component) => {
        try {
          const validate = getMethodByComponent(component, 'validate')
          await validate?.()
          validList.push(true)
        } catch (e) {
          validList.push(e)
        }
      }
      try {
        await findFormAndHandler(vnodeList, handler)
      } catch (e) {
        console.log('findFormAndHandler', e)
      }
      return validList
    }
    const findFormAndHandler = async (vnodeList = [], handler = () => {}, depth = 1) => {
      for (let i = 0; i < vnodeList.length; i++) {
        const vnode = vnodeList[i]
        if (isFormComponent(vnode)) {
          const component = getComponent(vnode)
          await handler(component)
        } else {
          if (depth > props.maxDepth) return false
          // 使用defineAsyncComponent 是 subTree 及为下个组件
          const childVnodeList = isComponent(vnode)
            ? (vnode.component.subTree?.children ?? [vnode.component.subTree])
            : vnode.children
          // 如果是文字节点则跳过不处理
          if (typeof childVnodeList === 'string') {
            continue
          }
          if (childVnodeList?.length > 0) {
            await findFormAndHandler(childVnodeList, handler, ++depth) // 此处++必须在前
          }
        }
      }
    }
    const waiting = ref(false)
    // 默认使用props.onConfirm当入参为函数时使用函数
    const confirm = async (cb) => {
      // 防止cb为e导致的错误
      if (typeof cb !== 'function') cb = props.onConfirm
      try {
        waiting.value = true
        const validList = await validForms(defaultSlot.value)
        if (!validList.some(valid => valid !== true)) {
          const res = await new Promise((resolve, reject) => {
            if (typeof cb === 'function') {
              cb(resolve, reject)
            } else {
              reject(new TypeError('onConfirm is not a function'))
            }
          })
          updateVisible(false)
          return res ?? true
        } else {
          // 存在未通过验证的表单
          throw new Error('未通过表单验证')
        }
        // eslint-disable-next-line no-useless-catch
      } catch (e) {
        // 跑出错误
        throw e
      } finally {
        waiting.value = false
      }
    }
    const cancel = () => {
      updateVisible(false)
      emit('cancel')
    }
    const openHandler = () => {
      clearValidate(defaultSlot.value)
    }
    const closeHandler = () => {
      emit('close')
    }
    const updateVisible = (val) => {
      emit('update:modelValue', val)
    }
    const dialogSlots = {
      header: () => <>
        <div class="el-dialog__mainTitle">{ slots.mainTitle?.() || props.title }</div>
        <div class="el-dialog__subTitle">{slots.subTitle?.() || props.subTitle}</div>
      </>,
      default: () => {
        const slot = slots.default?.()
        if (slot) {
          defaultSlot.value = markRaw(slot)
        }
        return slot
      },
      footer: () => {
        if (!props.showOnly) {
          const defaultFooter = <div>
            {
              !waiting.value && props.showCancel &&
                <ElButton
                  onClick={() => cancel()}
                  size={props.buttonSize}>
                  {props.cancelText}
                </ElButton>
            }
            <ElButton
              onClick={() => confirm()}
              size={props.buttonSize}
              type={'primary'}
              loading={waiting.value} >
              {props.confirmText}
            </ElButton>
          </div>
          const footerSlot = slots.footer?.({ confirm, loading: waiting.value, cancel })
          return slots.footer ? footerSlot : defaultFooter
        } else {
          return slots.footer?.()
        }
      }
    }

    return () => (
      <ElDialog
        customClass={'cip-dialog__wrapper'}
        modelValue={props.modelValue}
        onUpdate:modelValue={updateVisible}
        title={props.title}
        width={props.width}
        closeOnClickModal={props.closeOnClickModal}
        top={props.top}
        destroyOnClose={props.destroyOnClose}
        appendToBody={true}
        onClose={() => closeHandler()}
        onOpen={() => openHandler()}
        fullscreen={props.fullscreen}
        v-slots={dialogSlots}/>
    )
  }
})