import { FC, ReactNode, useEffect, useState } from 'react';
import {
  Box,
  IconButton as MUIIconButton,
  IconButtonProps as MUIIconButtonProps,
} from '@mui/material';
import {
  DesktopWindows as DesktopWindowsIcon,
  PowerOffOutlined as PowerOffOutlinedIcon,
} from '@mui/icons-material';

import API_BASE_URL from '../../lib/consts/API_BASE_URL';
import { BORDER_RADIUS, GREY } from '../../lib/consts/DEFAULT_THEME';

import IconButton, { IconButtonProps } from '../IconButton';
import { InnerPanel, InnerPanelHeader, Panel, PanelHeader } from '../Panels';
import { BodyText, HeaderText } from '../Text';

type PreviewOptionalProps = {
  externalPreview?: string;
  headerEndAdornment?: ReactNode;
  isExternalPreviewStale?: boolean;
  isFetchPreview?: boolean;
  isShowControls?: boolean;
  isUseInnerPanel?: boolean;
  onClickConnectButton?: IconButtonProps['onClick'];
  onClickPreview?: MUIIconButtonProps['onClick'];
  serverName?: string;
};

type PreviewProps = PreviewOptionalProps & {
  serverUUID: string;
};

const PREVIEW_DEFAULT_PROPS: Required<
  Omit<PreviewOptionalProps, 'onClickConnectButton' | 'onClickPreview'>
> &
  Pick<PreviewOptionalProps, 'onClickConnectButton' | 'onClickPreview'> = {
  externalPreview: '',
  headerEndAdornment: null,
  isExternalPreviewStale: false,
  isFetchPreview: true,
  isShowControls: true,
  isUseInnerPanel: false,
  onClickConnectButton: undefined,
  onClickPreview: undefined,
  serverName: '',
};

const PreviewPanel: FC<{ isUseInnerPanel: boolean }> = ({
  children,
  isUseInnerPanel,
}) =>
  isUseInnerPanel ? (
    <InnerPanel>{children}</InnerPanel>
  ) : (
    <Panel>{children}</Panel>
  );

const PreviewPanelHeader: FC<{
  isUseInnerPanel: boolean;
  text: string | undefined;
}> = ({ children, isUseInnerPanel, text }) =>
  isUseInnerPanel ? (
    <InnerPanelHeader>
      {text ? <BodyText text={text} /> : <></>}
      {children}
    </InnerPanelHeader>
  ) : (
    <PanelHeader>
      {text ? <HeaderText text={text} /> : <></>}
      {children}
    </PanelHeader>
  );

const Preview: FC<PreviewProps> = ({
  externalPreview = PREVIEW_DEFAULT_PROPS.externalPreview,
  headerEndAdornment,
  isExternalPreviewStale = PREVIEW_DEFAULT_PROPS.isExternalPreviewStale,
  isFetchPreview = PREVIEW_DEFAULT_PROPS.isFetchPreview,
  isShowControls = PREVIEW_DEFAULT_PROPS.isShowControls,
  isUseInnerPanel = PREVIEW_DEFAULT_PROPS.isUseInnerPanel,
  onClickPreview: previewClickHandler,
  serverName,
  serverUUID,
  onClickConnectButton: connectButtonClickHandle = previewClickHandler,
}) => {
  const [isPreviewStale, setIsPreviewStale] = useState<boolean>(false);
  const [preview, setPreview] = useState<string>('');

  useEffect(() => {
    if (isFetchPreview) {
      (async () => {
        try {
          const response = await fetch(
            `${API_BASE_URL}/server/${serverUUID}?ss`,
            {
              method: 'GET',
              headers: {
                'Content-Type': 'application/json',
              },
            },
          );
          const { screenshot: fetchedScreenshot } = await response.json();

          setPreview(fetchedScreenshot);
          setIsPreviewStale(false);
        } catch {
          setIsPreviewStale(true);
        }
      })();
    } else if (externalPreview) {
      setPreview(externalPreview);
      setIsPreviewStale(isExternalPreviewStale);
    }
  }, [externalPreview, isExternalPreviewStale, isFetchPreview, serverUUID]);

  return (
    <PreviewPanel isUseInnerPanel={isUseInnerPanel}>
      <PreviewPanelHeader isUseInnerPanel={isUseInnerPanel} text={serverName}>
        {headerEndAdornment}
      </PreviewPanelHeader>
      <Box
        sx={{
          display: 'flex',
          width: '100%',

          '& > :not(:last-child)': {
            marginRight: '1em',
          },
        }}
      >
        <Box>
          <MUIIconButton
            component="span"
            onClick={previewClickHandler}
            sx={{
              borderRadius: BORDER_RADIUS,
              color: GREY,
              padding: 0,
            }}
          >
            {preview ? (
              <Box
                alt=""
                component="img"
                src={`data:image/png;base64,${preview}`}
                sx={{
                  height: '100%',
                  opacity: isPreviewStale ? '0.4' : '1',
                  padding: isUseInnerPanel ? '.2em' : 0,
                  width: '100%',
                }}
              />
            ) : (
              <PowerOffOutlinedIcon
                sx={{
                  height: '100%',
                  width: '100%',
                }}
              />
            )}
          </MUIIconButton>
        </Box>
        {isShowControls && (
          <Box>
            <IconButton onClick={connectButtonClickHandle}>
              <DesktopWindowsIcon />
            </IconButton>
          </Box>
        )}
      </Box>
    </PreviewPanel>
  );
};

Preview.defaultProps = PREVIEW_DEFAULT_PROPS;

export default Preview;