import React from 'react';
import RcUpload from 'rc-upload';
import UploadList from './uploadList';
import getFileItem from './getFileItem';
import classNames from 'classnames';
import assign from 'object-assign';
import { UploadProps, UploadLocale } from './interface';

function T() {
  return true;
}

// Fix IE file.status problem
// via coping a new Object
function fileToObject(file): any {
  return {
    lastModified: file.lastModified,
    lastModifiedDate: file.lastModifiedDate,
    name: file.filename || file.name,
    size: file.size,
    type: file.type,
    uid: file.uid,
    response: file.response,
    error: file.error,
    percent: 0,
    originFileObj: file,
    status: null,
  };
}

/**
 * 生成Progress percent: 0.1 -> 0.98
 *   - for ie
 */
function genPercentAdd() {
  let k = 0.1;
  const i = 0.01;
  const end = 0.98;
  return function (s) {
    let start = s;
    if (start >= end) {
      return start;
    }

    start += k;
    k = k - i;
    if (k < 0.001) {
      k = 0.001;
    }
    return start * 100;
  };
}

const defaultLocale: UploadLocale = {
  uploading: '文件上传中',
  removeFile: '删除文件',
  uploadError: '上传错误',
  previewFile: '预览文件',
};

export { UploadProps };

export function Dragger(props) {
  return <Upload {...props} type="drag" style={{ height: props.height }}/>;
}

export default class Upload extends React.Component<UploadProps, any> {
  static Dragger = Dragger;

  static defaultProps = {
    prefixCls: 'ant-upload',
    type: 'select',
    multiple: false,
    action: '',
    data: {},
    accept: '',
    beforeUpload: T,
    showUploadList: true,
    listType: 'text', // or pictrue
    className: '',
    disabled: false,
    supportServerRender: true,
  };

  recentUploadStatus: boolean | PromiseLike<any>;
  progressTimer: any;
  refs: {
    [key: string]: any;
    upload: any;
  };

  constructor(props) {
    super(props);
    this.state = {
      fileList: this.props.fileList || this.props.defaultFileList || [],
      dragState: 'drop',
    };
  }

  componentWillUnmount() {
    this.clearProgressTimer();
  }

  getLocale() {
    let locale = {};
    if (this.context.antLocale && this.context.antLocale.Upload) {
      locale = this.context.antLocale.Upload;
    }
    return assign({}, defaultLocale, locale, this.props.locale);
  }

  onStart = (file) => {
    let targetItem;
    let nextFileList = this.state.fileList.concat();
    if (file.length > 0) {
      targetItem = file.map(f => {
        const fileObject = fileToObject(f);
        fileObject.status = 'uploading';
        return fileObject;
      });
      nextFileList = nextFileList.concat(targetItem);
    } else {
      targetItem = fileToObject(file);
      targetItem.status = 'uploading';
      nextFileList.push(targetItem);
    }
    this.onChange({
      file: targetItem,
      fileList: nextFileList,
    });
    // fix ie progress
    if (!(window as any).FormData) {
      this.autoUpdateProgress(0, targetItem);
    }
  }

  autoUpdateProgress(_, file) {
    const getPercent = genPercentAdd();
    let curPercent = 0;
    this.clearProgressTimer();
    this.progressTimer = setInterval(() => {
      curPercent = getPercent(curPercent);
      this.onProgress({
        percent: curPercent,
      }, file);
    }, 200);
  }

  removeFile(file) {
    let fileList = this.state.fileList;
    let targetItem = getFileItem(file, fileList);
    let index = fileList.indexOf(targetItem);
    if (index !== -1) {
      fileList.splice(index, 1);
      return fileList;
    }
    return null;
  }

  onSuccess = (response, file) => {
    this.clearProgressTimer();
    try {
      if (typeof response === 'string') {
        response = JSON.parse(response);
      }
    } catch (e) { /* do nothing */
    }
    let fileList = this.state.fileList;
    let targetItem = getFileItem(file, fileList);
    // removed
    if (!targetItem) {
      return;
    }
    targetItem.status = 'done';
    targetItem.response = response;
    this.onChange({
      file: targetItem,
      fileList,
    });
  }

  onProgress = (e, file) => {
    let fileList = this.state.fileList;
    let targetItem = getFileItem(file, fileList);
    // removed
    if (!targetItem) {
      return;
    }
    targetItem.percent = e.percent;
    this.onChange({
      event: e,
      file: targetItem,
      fileList: this.state.fileList,
    });
  }

  onError = (error, response, file) => {
    this.clearProgressTimer();
    let fileList = this.state.fileList;
    let targetItem = getFileItem(file, fileList);
    // removed
    if (!targetItem) {
      return;
    }
    targetItem.error = error;
    targetItem.response = response;
    targetItem.status = 'error';
    this.onChange({
      file: targetItem,
      fileList,
    });
  }

  handleRemove(file) {
    const { onRemove } = this.props;
    // Prevent removing file
    const onRemoveReturnValue = onRemove && onRemove(file);
    if (onRemoveReturnValue !== false) {
      let fileList = this.removeFile(file);
      if (fileList) {
        this.onChange({
          file,
          fileList,
        });
      }
    }
  }

  handleManualRemove = (file) => {
    this.refs.upload.abort(file);
    file.status = 'removed'; // eslint-disable-line
    this.handleRemove(file);
  }

  onChange = (info) => {
    if (!('fileList' in this.props)) {
      this.setState({ fileList: info.fileList });
    }

    const onChange = this.props.onChange;
    if (onChange) {
      onChange(info);
    }
  }

  componentWillReceiveProps(nextProps) {
    if ('fileList' in nextProps) {
      this.setState({
        fileList: nextProps.fileList || [],
      });
    }
  }

  onFileDrop = (e) => {
    this.setState({
      dragState: e.type,
    });
  }

  clearProgressTimer() {
    clearInterval(this.progressTimer);
  }

  render() {
    const {
      prefixCls = '', showUploadList, listType, onPreview,
      type, disabled, children, className,
    } = this.props;

    const rcUploadProps = assign({}, this.props, {
      onStart: this.onStart,
      onError: this.onError,
      onProgress: this.onProgress,
      onSuccess: this.onSuccess,
    });
    delete rcUploadProps.className;

    const { showRemoveIcon, showPreviewIcon } = showUploadList as any;
    const uploadList = showUploadList ? (
      <UploadList
        listType={listType}
        items={this.state.fileList}
        onPreview={onPreview}
        onRemove={this.handleManualRemove}
        showRemoveIcon={showRemoveIcon}
        showPreviewIcon={showPreviewIcon}
        locale={this.getLocale()}
      />
    ) : null;

    if (type === 'drag') {
      const dragCls = classNames(prefixCls, {
        [`${prefixCls}-drag`]: true,
        [`${prefixCls}-drag-uploading`]: this.state.fileList.some(file => file.status === 'uploading'),
        [`${prefixCls}-drag-hover`]: this.state.dragState === 'dragover',
        [`${prefixCls}-disabled`]: disabled,
      });
      return (
        <span className={className}>
          <div
            className={dragCls}
            onDrop={this.onFileDrop}
            onDragOver={this.onFileDrop}
            onDragLeave={this.onFileDrop}
          >
            <RcUpload {...rcUploadProps} ref="upload" className={`${prefixCls}-btn`}>
              <div className={`${prefixCls}-drag-container`}>
                {children}
              </div>
            </RcUpload>
          </div>
          {uploadList}
        </span>
      );
    }

    const uploadButtonCls = classNames(prefixCls, {
      [`${prefixCls}-select`]: true,
      [`${prefixCls}-select-${listType}`]: true,
      [`${prefixCls}-disabled`]: disabled,
    });

    const uploadButton = (
      <div className={uploadButtonCls} style={{ display: children ? '' : 'none'}}>
        <RcUpload {...rcUploadProps} ref="upload" />
      </div>
    );

    if (listType === 'picture-card') {
      return (
        <span className={className}>
          {uploadList}
          {uploadButton}
        </span>
      );
    }
    return (
      <span className={className}>
        {uploadButton}
        {uploadList}
      </span>
    );
  }
}
