import React, { useCallback } from 'react';
import { translate } from '@aws-amplify/ui';
import { humanFileSize } from '@aws-amplify/ui';
import { FileState, TrackerProps } from '../types';
import {
  View,
  Image,
  Text,
  Button,
  TextField,
  Loader,
  ComponentClassNames,
  VisuallyHidden,
} from '../../../../primitives';
import {
  IconClose,
  IconEdit,
  IconFile,
} from '../../../../primitives/Icon/internal';
import { UploadMessage } from './UploadMessage';

export function UploadTracker({
  errorMessage,
  file,
  fileState,
  hasImage,
  name,
  onCancel,
  onCancelEdit,
  onPause,
  onResume,
  onSaveEdit,
  onStartEdit,
  percentage,
  isResumable,
  showImage,
}: TrackerProps): JSX.Element | null {
  const [tempName, setTempName] = React.useState(name);
  const inputRef = React.useRef<HTMLInputElement>(null);
  const url = URL.createObjectURL(file);

  // Focus the input after pressing the edit button
  React.useEffect(() => {
    if (fileState === FileState.EDITING && inputRef.current) {
      inputRef.current.focus();
    }
  }, [fileState]);

  const { size } = file;

  const icon = hasImage ? <Image alt={file.name} src={url} /> : <IconFile />;
  const isDeterminate = isResumable ? percentage > 0 : true;

  const showEditButton =
    fileState === FileState.INIT ||
    (fileState === FileState.ERROR &&
      errorMessage === translate('Extension not allowed'));

  const DisplayView = useCallback(
    () => (
      <>
        <View className={ComponentClassNames.FileUploaderFileMain}>
          <Text className={ComponentClassNames.FileUploaderFileName}>
            {name}
          </Text>
        </View>
        {showEditButton ? (
          <Button onClick={onStartEdit} size="small" variation="link">
            <VisuallyHidden>Edit file name {file.name}</VisuallyHidden>
            <IconEdit aria-hidden fontSize="medium" />
          </Button>
        ) : null}
        <Text as="span" className={ComponentClassNames.FileUploaderFileSize}>
          {humanFileSize(size, true)}
        </Text>
      </>
    ),
    [file.name, name, onStartEdit, showEditButton, size]
  );

  const Actions = useCallback(() => {
    switch (fileState) {
      case FileState.EDITING:
        return (
          <>
            <Button
              size="small"
              onClick={() => {
                setTempName(name);
                onCancelEdit?.();
              }}
            >
              Cancel
            </Button>
            <Button
              size="small"
              variation="primary"
              onClick={() => {
                onSaveEdit(tempName);
              }}
            >
              Save
            </Button>
          </>
        );
      case FileState.RESUME:
      case FileState.LOADING:
        if (!isResumable) return null;
        return (
          <Button onClick={onPause} size="small" variation="link">
            {translate('pause')}
          </Button>
        );
      case FileState.PAUSED:
        return (
          <Button onClick={onResume} size="small" variation="link">
            {translate('Resume')}
          </Button>
        );
      case FileState.SUCCESS:
        return null;
      default:
        return (
          <Button size="small" onClick={onCancel}>
            <VisuallyHidden>Remove file name {file.name}</VisuallyHidden>
            <IconClose aria-hidden fontSize="medium" />
          </Button>
        );
    }
  }, [
    file.name,
    fileState,
    isResumable,
    name,
    onCancel,
    onCancelEdit,
    onPause,
    onResume,
    onSaveEdit,
    tempName,
  ]);

  if (!file) return null;

  return (
    <View className={ComponentClassNames.FileUploaderFile}>
      <View className={ComponentClassNames.FileUploaderFileWrapper}>
        {showImage ? (
          <View className={ComponentClassNames.FileUploaderFileImage}>
            {icon}
          </View>
        ) : null}

        {/* Main View */}
        {fileState === FileState.EDITING ? (
          // Wrapping this text field in a form with onSubmit will allow keyboard
          // users to press enter to save changes.
          <View
            as="form"
            flex="1"
            onSubmit={() => {
              onSaveEdit(tempName);
            }}
          >
            <TextField
              maxLength={1024}
              ref={inputRef}
              label="file name"
              size="small"
              variation="quiet"
              labelHidden
              onChange={(e: React.ChangeEvent<HTMLInputElement>) => {
                setTempName(e.target.value);
              }}
              value={tempName}
            />
          </View>
        ) : (
          <DisplayView />
        )}

        <Actions />

        {fileState === FileState.LOADING ? (
          <Loader
            className={ComponentClassNames.FileUploaderLoader}
            variation="linear"
            percentage={percentage}
            isDeterminate={isDeterminate}
            isPercentageTextHidden
          />
        ) : null}
      </View>
      <UploadMessage
        fileState={fileState}
        errorMessage={errorMessage}
        percentage={percentage}
      />
    </View>
  );
}
