import { VantComponent } from '../common/component';
import { isImageFile, chooseFile, isVideoFile } from './utils';
import { chooseImageProps, chooseVideoProps } from './shared';
import { isBoolean, isPromise } from '../common/validator';
VantComponent({
  props: Object.assign(
    Object.assign(
      {
        disabled: Boolean,
        multiple: Boolean,
        uploadText: String,
        useBeforeRead: Boolean,
        afterRead: null,
        beforeRead: null,
        previewSize: {
          type: null,
          value: 80,
        },
        name: {
          type: [Number, String],
          value: '',
        },
        accept: {
          type: String,
          value: 'image',
        },
        fileList: {
          type: Array,
          value: [],
          observer: 'formatFileList',
        },
        maxSize: {
          type: Number,
          value: Number.MAX_VALUE,
        },
        maxCount: {
          type: Number,
          value: 100,
        },
        deletable: {
          type: Boolean,
          value: true,
        },
        showUpload: {
          type: Boolean,
          value: true,
        },
        previewImage: {
          type: Boolean,
          value: true,
        },
        previewFullImage: {
          type: Boolean,
          value: true,
        },
        imageFit: {
          type: String,
          value: 'scaleToFill',
        },
        uploadIcon: {
          type: String,
          value: 'photograph',
        },
      },
      chooseImageProps
    ),
    chooseVideoProps
  ),
  data: {
    lists: [],
    isInCount: true,
  },
  methods: {
    formatFileList() {
      const { fileList = [], maxCount } = this.data;
      const lists = fileList.map((item) =>
        Object.assign(Object.assign({}, item), {
          isImage: isImageFile(item),
          isVideo: isVideoFile(item),
          deletable: isBoolean(item.deletable) ? item.deletable : true,
        })
      );
      this.setData({ lists, isInCount: lists.length < maxCount });
    },
    getDetail(index) {
      return {
        name: this.data.name,
        index: index == null ? this.data.fileList.length : index,
      };
    },
    startUpload() {
      const { maxCount, multiple, lists, disabled } = this.data;
      if (disabled) return;
      chooseFile(
        Object.assign(Object.assign({}, this.data), {
          maxCount: maxCount - lists.length,
        })
      )
        .then((res) => {
          this.onBeforeRead(multiple ? res : res[0]);
        })
        .catch((error) => {
          this.$emit('error', error);
        });
    },
    onBeforeRead(file) {
      const { beforeRead, useBeforeRead } = this.data;
      let res = true;
      if (typeof beforeRead === 'function') {
        res = beforeRead(file, this.getDetail());
      }
      if (useBeforeRead) {
        res = new Promise((resolve, reject) => {
          this.$emit(
            'before-read',
            Object.assign(Object.assign({ file }, this.getDetail()), {
              callback: (ok) => {
                ok ? resolve() : reject();
              },
            })
          );
        });
      }
      if (!res) {
        return;
      }
      if (isPromise(res)) {
        res.then((data) => this.onAfterRead(data || file));
      } else {
        this.onAfterRead(file);
      }
    },
    onAfterRead(file) {
      const { maxSize, afterRead } = this.data;
      const oversize = Array.isArray(file)
        ? file.some((item) => item.size > maxSize)
        : file.size > maxSize;
      if (oversize) {
        this.$emit('oversize', Object.assign({ file }, this.getDetail()));
        return;
      }
      if (typeof afterRead === 'function') {
        afterRead(file, this.getDetail());
      }
      this.$emit('after-read', Object.assign({ file }, this.getDetail()));
    },
    deleteItem(event) {
      const { index } = event.currentTarget.dataset;
      this.$emit(
        'delete',
        Object.assign(Object.assign({}, this.getDetail(index)), {
          file: this.data.fileList[index],
        })
      );
    },
    onPreviewImage(event) {
      if (!this.data.previewFullImage) return;
      const { index } = event.currentTarget.dataset;
      const { lists } = this.data;
      const item = lists[index];
      wx.previewImage({
        urls: lists.filter((item) => isImageFile(item)).map((item) => item.url),
        current: item.url,
        fail() {
          wx.showToast({ title: '预览图片失败', icon: 'none' });
        },
      });
    },
    onPreviewVideo(event) {
      if (!this.data.previewFullImage) return;
      const { index } = event.currentTarget.dataset;
      const { lists } = this.data;
      wx.previewMedia({
        sources: lists
          .filter((item) => isVideoFile(item))
          .map((item) =>
            Object.assign(Object.assign({}, item), { type: 'video' })
          ),
        current: index,
        fail() {
          wx.showToast({ title: '预览视频失败', icon: 'none' });
        },
      });
    },
    onClickPreview(event) {
      const { index } = event.currentTarget.dataset;
      const item = this.data.lists[index];
      this.$emit(
        'click-preview',
        Object.assign(Object.assign({}, item), this.getDetail(index))
      );
    },
  },
});
