import React, { useState, useEffect, forwardRef, useImperativeHandle } from 'react'
import { Image, View, Text, ScrollView, Button } from '@tarojs/components'
import Taro from '@tarojs/taro'
import img from '../../config/images'
import publishService from '../../services/publishService'
import { CommonPopup } from '../'
import emptyStatus from '../../static/emptyStatus/publish-empty.png'

import './upload-source-popup.scss'

type SourceType = 'history' | 'preset'

type ImageItem = {
  id: string
  url: string
  tempFilePath?: string
}

interface UploadImageProps {
  onAdd: (images: ImageItem[]) => void
}

export const sourceMap = new Map<SourceType, string>([
  ['history', '历史图库'],
  ['preset', '预设图库']
])

const checkImageSelected = (images: ImageItem[], image: ImageItem) => {
  return images.some(item => item.id === image.id)
}

export default forwardRef(function UploadImage(props: UploadImageProps, ref) {
  const {
    onAdd = () => void 0,
  } = props
  const [visible, setVisible] = useState(false)
  const [sourceType, setSourceType] = useState<SourceType>('history')
  const [maxCount, setMaxCount] = useState(9)
  const [images, setImages] = useState<ImageItem[]>([])
  const [selectedImages, setSelectedImages] = useState<ImageItem[]>([])

  const handleImageClick = (image: ImageItem) => {
    if (checkImageSelected(selectedImages, image)) {
      setSelectedImages(selectedImages.filter(item => item.id !== image.id))
    } else if (!outOfMax) {
      setSelectedImages([...selectedImages, image])
    } else {
      Taro.showToast({
        title: `最多选择${maxCount}张图片`,
        icon: 'none'
      })
    }
  }

  useImperativeHandle(ref, () => ({
    show: (sourceType: SourceType, maxCount: number) => {
      setVisible(true)
      setSourceType(sourceType)
      setMaxCount(maxCount)
      fetchImages()
    }
  }))

  function fetchImages() {
    publishService.getPictures({
      pageOption: {
        page: 1,
        pageSize: 100,
      },
      seachOption: {
        tag: '',
        resource_type: 'image',
        dateRange: [],
      },
    }).then(res => {
      if (res.success) {
        let start = 0
        setImages(res.data.data.rows.map(item => ({
          id: (Date.now() + start++).toString(),
          url: item.thumbnail_url,
        })))
      } else {
        // TODO: 显示错误信息
        Taro.showToast({
          title: res.message,
          icon: 'none'
        })
      }
    })
  }

  function onClose() {
    setVisible(false)
    setSelectedImages([])
    setImages([])
    setSourceType('history')
    setMaxCount(9)
  }

  const handleConfirm = () => {
    if (selectedImages.length > 0) {
      onAdd(selectedImages)
      setVisible(false)
    } else {
      Taro.showToast({
        title: '请选择图片',
        icon: 'none'
      })
    }
  }

  const outOfMax = selectedImages.length >= maxCount

  return (
    <>
      <CommonPopup
        visible={visible}
        onClose={onClose}
        round
        hideFooter
        position='bottom'
        zIndex={1001}
      >
        <View className="upload-popup">
          <View className="upload-popup-title">{sourceMap.get(sourceType)}</View>
          {/* TODO: 分页 加载更多 */}
          {/* TODO: 图片加载失败 */}
          {/* TODO: 图片加载中 */}
          <ScrollView
            scrollY
            className="upload-popup-scroll-view"
          >
            {images.length > 0 ? (
            <View className="upload-popup-image-list">
              {images.map(item => {
                const isSelected = checkImageSelected(selectedImages, item)
                return (
                  <View className={`upload-popup-image-item ${outOfMax ? 'disabled' : ''} ${isSelected ? 'selected' : ''}`} onClick={() => handleImageClick(item)}>
                    <Image className="upload-popup-image-item-image" src={item.url} />
                    <View className={`upload-popup-image-item-select ${isSelected ? 'selected' : ''}`}>
                      {isSelected ? (
                        <Image className="select-image-icon" src={img.ICON_CIRCLE_SELECT_ARROW} />
                      ) : (
                        <Image className="select-image-icon" src={img.ICON_CIRCLE_UNSELECT} />
                      )}
                    </View>
                  </View>
                )
              })}
            </View>
            ) : (
              <View className="upload-popup-image-list-empty">
                <Image className="upload-popup-image-list-empty-image" src={emptyStatus} />
                <Text className="upload-popup-image-list-empty-text">暂无内容</Text>
              </View>
            )}
          </ScrollView>
          {images.length > 0 ? (
          <View className="upload-popup-footer">
            <Button className="upload-popup-footer-cancel" onClick={() => setVisible(false)}>取消</Button>
            <Button className={`upload-popup-footer-confirm ${selectedImages.length > 0 ? 'active' : ''}`} type='primary' onClick={handleConfirm}>完成</Button>
          </View>
          ) : (
            <View className="upload-popup-footer">
              <Button className="upload-popup-footer-cancel" onClick={() => setVisible(false)}>取消</Button>
            </View>
          )}
        </View>
      </CommonPopup>
      {/* <View className="upload-source-popup-text" onClick={() => setVisible(true)}>{sourceMap.get(sourceType)}选取</View> */}
    </>
  );
});