import React from 'react';
import Button from '@mui/material/Button';
import CircularProgress from '@mui/material/CircularProgress';
import CloudUploadIcon from '@mui/icons-material/CloudUpload';
import ErrorIcon from '@mui/icons-material/Error';
import type { ImageLoaded, ImageUploadProps, ImageUploadState } from './types';
import { defaultTranslations } from './defaultTranslations';
import type { TranslatorFunction } from '../../core/components/hooks';
import { useUiTranslator } from '../../core/components/hooks';

const NO_FILE_ERROR_CODE = 1;
const BAD_EXTENSION_ERROR_CODE = 2;
const TOO_BIG_ERROR_CODE = 3;
const UPLOADING_ERROR_CODE = 4;

/*
 * FIXME: rewrite to functional component
 */
class ImageUpload extends React.Component<
  ImageUploadProps & {
    t: TranslatorFunction;
  },
  ImageUploadState
> {
  static defaultProps = {
    icon: <CloudUploadIcon style={{ marginLeft: '8px' }} />,
    allowedExtensions: ['jpg', 'jpeg', 'png'],
    maxFileSize: 5242880,
    translations: defaultTranslations,
  };
  fileInput?: HTMLInputElement | null;

  state: ImageUploadState = {
    isUploading: false,
    hasError: false,
    errorText: '',
    progress: 0,
  };

  hasExtension = (fileName: string) => {
    const patternPart = this.props.allowedExtensions
      ? this.props.allowedExtensions.map((a) => a.toLowerCase()).join('|')
      : '';
    const pattern = '(' + patternPart.replace(/\./g, '\\.') + ')$';
    return new RegExp(pattern, 'i').test(fileName.toLowerCase());
  };

  handleError = (errorCode: number) => {
    let errorText: string | null;

    switch (errorCode) {
      case NO_FILE_ERROR_CODE:
        errorText = this.props.t(this.props.translations?.noFileError);
        break;
      case BAD_EXTENSION_ERROR_CODE:
        errorText = this.props.t(this.props.translations?.badExtensionError);
        break;
      case TOO_BIG_ERROR_CODE:
        errorText = this.props.t(this.props.translations?.tooBigError);
        break;
      case UPLOADING_ERROR_CODE:
        errorText = this.props.t(this.props.translations?.uploadingError);
        break;
      default:
        errorText = this.props.t(this.props.translations?.unknownError);
        break;
    }
    // Need to flick "isUploading" because otherwise the handler doesn't fire properly
    this.setState({ hasError: true, errorText, isUploading: true }, () =>
      this.setState({ isUploading: false })
    );
    setTimeout(() => this.setState({ hasError: false, errorText: '' }), 5000);
  };

  handleFileSelected: React.ChangeEventHandler<HTMLInputElement> = (e) => {
    if (!e.target.files || !e.target.files[0]) {
      this.handleError(NO_FILE_ERROR_CODE);
      return;
    }
    const file = e.target.files[0];
    if (!this.hasExtension(file.name)) {
      this.handleError(BAD_EXTENSION_ERROR_CODE);
      return;
    }
    if (this.props.maxFileSize && file.size > this.props.maxFileSize) {
      this.handleError(TOO_BIG_ERROR_CODE);
      return;
    }
    if (this.props.imageLoaded) {
      this.readFile(file).then((data) => this.props.imageLoaded?.(data));
    }
    if (this.props.imageUpload) {
      this.setState({ isUploading: true });
      this.props
        .imageUpload(file, this.handleReportProgress)
        .then((resp) => {
          this.setState({ progress: undefined, isUploading: false });
          this.props.imageUploaded && this.props.imageUploaded(resp);
        })
        .catch((error) => {
          this.setState({ isUploading: false });
          this.props.imageUploadError && this.props.imageUploadError(error);
        });
    }
  };

  readFile(file: File): Promise<ImageLoaded> {
    return new Promise((resolve, reject) => {
      const reader = new FileReader();

      // Read the image via FileReader API and save image result in state.
      reader.onload = function (e: ProgressEvent) {
        // Add the file name to the data URL
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        let dataUrl: string = (e.target as any).result;
        dataUrl = dataUrl.replace(';base64', `;name=${file.name};base64`);
        resolve({ file, dataUrl });
      };

      reader.readAsDataURL(file);
    });
  }

  handleFileUploadClick: React.MouseEventHandler<HTMLElement> = () =>
    this.fileInput?.click();

  handleReportProgress = (progress: number) => this.setState({ progress });

  renderChildren = () => {
    if (this.state.isUploading) {
      return <CircularProgress value={this.state.progress} size={19} />;
    }
    if (this.state.hasError) {
      return (
        <React.Fragment>
          {this.state.errorText}
          <ErrorIcon style={{ marginLeft: '8px' }} />
        </React.Fragment>
      );
    }
    return (
      <React.Fragment>
        {this.props.translations?.buttonContent}
        {this.props.icon}
      </React.Fragment>
    );
  };

  render() {
    return (
      <React.Fragment>
        <Button
          disabled={this.state.isUploading}
          variant="contained"
          color={this.state.hasError ? 'secondary' : 'primary'}
          onClick={this.handleFileUploadClick}
          style={this.props.style}
          size="small"
        >
          {this.renderChildren()}
        </Button>
        {!this.state.isUploading && (
          <input
            style={{ display: 'none' }}
            ref={(fileInput) => (this.fileInput = fileInput)}
            type="file"
            onChange={this.handleFileSelected}
          />
        )}
      </React.Fragment>
    );
  }
}

export default (props: ImageUploadProps) => {
  const { t } = useUiTranslator();
  return <ImageUpload {...props} t={t} />;
};