import type { PropType } from 'vue'
import { defineComponent, onMounted, ref, Teleport } from 'vue'
import { getPrefixCls } from '../_utils/getPrefixCls'
import Button from '../button/index'
import Icon from '../icon/index'

type DrawerSize = 'small' | 'medium' | 'large'
type SizeType = number | string | DrawerSize

export default defineComponent({
  name: 'Drawer',
  props: {
    visible: {
      type: Boolean,
      default: false,
    },
    placement: {
      type: String as PropType<'top' | 'bottom' | 'left' | 'right'>,
      default: 'right',
    },
    size: {
      type: [Number, String] as PropType<SizeType>,
      default: 'medium',
    },
    title: {
      type: String,
      default: '',
    },
    showClose: {
      type: Boolean,
      default: false,
    },
    confirmBtn: {
      type: null,
      default: () => ({ label: '确认', type: 'solid', status: 'primary' }),
    },
    cancelBtn: {
      type: null,
      default: () => ({ label: '取消', type: 'solid', status: 'default' }),
    },
    beforeConfirm: {
      type: Function as PropType<
        (done: (ok: boolean) => void) => void | boolean | Promise<boolean>
      >,
    },
    maskClose: {
      type: Boolean,
      default: true,
    },
    appendTo: {
      type: [String, Object] as PropType<string | HTMLElement>,
      default: 'body',
    },
  },
  emits: ['update:visible', 'confirm', 'cancel'],
  setup(props, { slots, emit }) {
    const prefixCls = getPrefixCls('drawer')
    const confirmLoading = ref<boolean>(false)

    const close = () => {
      emit('update:visible', false)
      confirmLoading.value = false
    }

    const handleMaskClick = () => {
      if (props.maskClose) {
        close()
      }
    }

    const resolveSize = (value: SizeType, defaultPx = 300) => {
      if (typeof value === 'number')
        return `${value}px`
      if (typeof value === 'string') {
        const presetMap: Record<DrawerSize, string> = {
          small: '300px',
          medium: '500px',
          large: '700px',
        }
        if (presetMap[value as DrawerSize])
          return presetMap[value as DrawerSize]
        return value
      }
      return `${defaultPx}px`
    }

    const handleConfirm = async () => {
      let allow = true

      if (props.beforeConfirm) {
        confirmLoading.value = true

        try {
          allow = await new Promise<boolean>((resolve) => {
            const result = props.beforeConfirm!(ok => resolve(ok))

            if (typeof result === 'boolean') {
              resolve(result)
            }
            else if (result instanceof Promise) {
              result.then(ok => resolve(ok)).catch(() => resolve(false))
            }
            // 如果是用 done 回调，就等调用方触发 resolve
          })
        }
        catch {
          allow = false
        }
      }

      if (allow) {
        close()
        emit('confirm')
      }

      confirmLoading.value = false
    }

    const handleCancel = () => {
      close()
      emit('cancel')
    }
    // 挂载目标位置
    const targetEl = ref<HTMLElement>(document.body)

    onMounted(() => {
      if (props.appendTo instanceof HTMLElement) {
        targetEl.value = props.appendTo
      }
      else if (typeof props.appendTo === 'string') {
        const el = document.querySelector(props.appendTo)
        if (el)
          targetEl.value = el as HTMLElement
      }
    })

    // 判断是否是 body
    const isBody = props.appendTo === 'body'

    return () => (
      <Teleport to={targetEl.value}>
        <div
          class={[prefixCls, `${prefixCls}-${props.placement}`, props.visible && `${prefixCls}-open`]}
          style={{
            position: isBody ? 'fixed' : 'absolute',
          }}
        >
          <div class={`${prefixCls}-mask`} onClick={handleMaskClick}></div>

          <div
            class={[`${prefixCls}-wrapper`]}
            style={{
              width: ['left', 'right'].includes(props.placement)
                ? resolveSize(props.size)
                : '100%',
              height: ['top', 'bottom'].includes(props.placement)
                ? resolveSize(props.size)
                : '100%',
            }}
          >
            <div class={`${prefixCls}-header`}>
              {slots.header
                ? slots.header()
                : (
                    <>
                      <span>{props.title}</span>
                      {props.showClose && (
                        <Icon
                          class={`${prefixCls}-close`}
                          icon="ix:close"
                          onClick={() => emit('update:visible', false)}
                        />
                      )}
                    </>
                  )}
            </div>

            <div class={`${prefixCls}-body`}>
              {slots.default ? slots.default() : null}
            </div>

            <div class={`${prefixCls}-footer`}>
              {slots.footer
                ? slots.footer()
                : (
                    <>
                      <Button {...props.cancelBtn} block onClick={handleCancel}>
                        {props.cancelBtn.label}
                      </Button>
                      <Button loading={confirmLoading.value} block {...props.confirmBtn} onClick={handleConfirm}>
                        {props.confirmBtn.label}
                      </Button>
                    </>
                  )}
            </div>

          </div>
        </div>
      </Teleport>
    )
  },
})