import React, { Component } from 'react';
import { withTranslation } from 'react-i18next';
import {
  Button,
  IconButton,
  Badge,
  Tooltip,
  TextField,
  Grid,
  Container,
  Card,
  CardHeader,
  Paper,
  Avatar,
  Typography,
} from '@mui/material';
import ReconnectingWebSocket from 'reconnecting-websocket';
import { encryptMessage, decryptMessage } from '../utils/pgp';
import { saveAsJson } from '../utils/saveFile';
import { AuditPGPDialog } from './Dialogs';
import RobotAvatar from './Robots/RobotAvatar';
import { systemClient } from '../services/System';

// Icons
import CheckIcon from '@mui/icons-material/Check';
import CloseIcon from '@mui/icons-material/Close';
import ContentCopy from '@mui/icons-material/ContentCopy';
import VisibilityIcon from '@mui/icons-material/Visibility';
import CircularProgress from '@mui/material/CircularProgress';
import KeyIcon from '@mui/icons-material/Key';
import { ExportIcon } from './Icons';

class Chat extends Component {
  constructor(props) {
    super(props);
  }

  state = {
    own_pub_key: systemClient.getCookie('pub_key').split('\\').join('\n'),
    own_enc_priv_key: systemClient.getCookie('enc_priv_key').split('\\').join('\n'),
    peer_pub_key: null,
    token: systemClient.getCookie('robot_token'),
    messages: [],
    value: '',
    connected: false,
    peer_connected: false,
    audit: false,
    showPGP: new Array(),
    waitingEcho: false,
    lastSent: '---BLANK---',
    latestIndex: 0,
    scrollNow: false,
  };

  rws = new ReconnectingWebSocket(
    'ws://' + window.location.host + '/ws/chat/' + this.props.orderId + '/',
    [],
    { connectionTimeout: 15000 },
  );

  componentDidMount() {
    this.rws.addEventListener('open', () => {
      console.log('Connected!');
      this.setState({ connected: true });
      this.rws.send(
        JSON.stringify({
          type: 'message',
          message: this.state.own_pub_key,
          nick: this.props.ur_nick,
        }),
      );
    });

    this.rws.addEventListener('message', (message) => {
      const dataFromServer = JSON.parse(message.data);
      console.log('Got reply!', dataFromServer.type);
      console.log(
        'PGP message index',
        dataFromServer.index,
        ' latestIndex ',
        this.state.latestIndex,
      );
      if (dataFromServer) {
        console.log(dataFromServer);
        this.setState({ peer_connected: dataFromServer.peer_connected });

        // If we receive our own key on a message
        if (dataFromServer.message == this.state.own_pub_key) {
          console.log('OWN PUB KEY RECEIVED!!');
        }

        // If we receive a public key other than ours (our peer key!)
        if (
          dataFromServer.message.substring(0, 36) == `-----BEGIN PGP PUBLIC KEY BLOCK-----` &&
          dataFromServer.message != this.state.own_pub_key
        ) {
          if (dataFromServer.message == this.state.peer_pub_key) {
            console.log('PEER HAS RECONNECTED USING HIS PREVIOUSLY KNOWN PUBKEY');
          } else if (
            (dataFromServer.message != this.state.peer_pub_key) &
            (this.state.peer_pub_key != null)
          ) {
            console.log('PEER PUBKEY HAS CHANGED');
          }
          console.log('PEER PUBKEY RECEIVED!!');
          this.setState({ peer_pub_key: dataFromServer.message });

          // After receiving the peer pubkey we ask the server for the historic messages if any
          this.rws.send(
            JSON.stringify({
              type: 'message',
              message: `-----SERVE HISTORY-----`,
              nick: this.props.ur_nick,
            }),
          );
        }

        // If we receive an encrypted message
        else if (
          dataFromServer.message.substring(0, 27) == `-----BEGIN PGP MESSAGE-----` &&
          dataFromServer.index > this.state.latestIndex
        ) {
          decryptMessage(
            dataFromServer.message.split('\\').join('\n'),
            dataFromServer.user_nick == this.props.ur_nick
              ? this.state.own_pub_key
              : this.state.peer_pub_key,
            this.state.own_enc_priv_key,
            this.state.token,
          ).then((decryptedData) =>
            this.setState((state) => ({
              scrollNow: true,
              waitingEcho:
                this.state.waitingEcho == true
                  ? decryptedData.decryptedMessage != this.state.lastSent
                  : false,
              lastSent:
                decryptedData.decryptedMessage == this.state.lastSent
                  ? '----BLANK----'
                  : this.state.lastSent,
              latestIndex:
                dataFromServer.index > this.state.latestIndex
                  ? dataFromServer.index
                  : this.state.latestIndex,
              messages: [
                ...state.messages,
                {
                  index: dataFromServer.index,
                  encryptedMessage: dataFromServer.message.split('\\').join('\n'),
                  plainTextMessage: decryptedData.decryptedMessage,
                  validSignature: decryptedData.validSignature,
                  userNick: dataFromServer.user_nick,
                  time: dataFromServer.time,
                },
              ].sort(function (a, b) {
                // order the message array by their index (increasing)
                return a.index - b.index;
              }),
            })),
          );
        }

        // We allow plaintext communication. The user must write # to start
        // If we receive an plaintext message
        else if (dataFromServer.message.substring(0, 1) == '#') {
          console.log('Got plaintext message', dataFromServer.message);
          this.setState((state) => ({
            scrollNow: true,
            messages: [
              ...state.messages,
              {
                index: this.state.latestIndex + 0.001,
                encryptedMessage: dataFromServer.message,
                plainTextMessage: dataFromServer.message,
                validSignature: false,
                userNick: dataFromServer.user_nick,
                time: new Date().toString(),
              },
            ],
          }));
        }
      }
    });

    this.rws.addEventListener('close', () => {
      console.log('Socket is closed. Reconnect will be attempted');
      this.setState({ connected: false });
    });

    this.rws.addEventListener('error', () => {
      console.error('Socket encountered error: Closing socket');
    });
  }

  componentDidUpdate() {
    // Only fire the scroll and audio when the reason for Update is a new message
    if (this.state.scrollNow) {
      const audio = new Audio(`/static/assets/sounds/chat-open.mp3`);
      audio.play();
      this.scrollToBottom();
      this.setState({ scrollNow: false });
    }
  }

  scrollToBottom = () => {
    this.messagesEnd.scrollIntoView({ behavior: 'smooth' });
  };

  onButtonClicked = (e) => {
    // If input string contains token. Do not set message
    if (this.state.value.indexOf(this.state.token) !== -1) {
      alert(
        `Aye! You just sent your own robot token to your peer in chat, that's a catastrophic idea! So bad your message was blocked.`,
      );
      this.setState({ value: '' });
    }

    // If input string contains '#' send unencrypted and unlogged message
    else if (this.state.value.substring(0, 1) == '#') {
      this.rws.send(
        JSON.stringify({
          type: 'message',
          message: this.state.value,
          nick: this.props.ur_nick,
        }),
      );
      this.setState({ value: '' });
    }

    // Else if message is not empty send message
    else if (this.state.value != '') {
      this.setState({ value: '', waitingEcho: true, lastSent: this.state.value });
      encryptMessage(
        this.state.value,
        this.state.own_pub_key,
        this.state.peer_pub_key,
        this.state.own_enc_priv_key,
        this.state.token,
      ).then(
        (encryptedMessage) =>
          console.log('Sending Encrypted MESSAGE', encryptedMessage) &
          this.rws.send(
            JSON.stringify({
              type: 'message',
              message: encryptedMessage.split('\n').join('\\'),
              nick: this.props.ur_nick,
            }),
          ),
      );
    }
    e.preventDefault();
  };

  createJsonFile = () => {
    return {
      credentials: {
        own_public_key: this.state.own_pub_key,
        peer_public_key: this.state.peer_pub_key,
        encrypted_private_key: this.state.own_enc_priv_key,
        passphrase: this.state.token,
      },
      messages: this.state.messages,
    };
  };

  messageCard = (props) => {
    const { t } = this.props;
    return (
      <Card elevation={5} align='left'>
        <CardHeader
          sx={{ color: '#333333' }}
          avatar={
            <RobotAvatar
              statusColor={props.userConnected ? 'success' : 'error'}
              nickname={props.message.userNick}
            />
          }
          style={{ backgroundColor: props.cardColor }}
          title={
            <Tooltip
              placement='top'
              enterTouchDelay={0}
              enterDelay={500}
              enterNextDelay={2000}
              title={t(
                props.message.validSignature
                  ? 'Verified signature by {{nickname}}'
                  : 'Cannot verify signature of {{nickname}}',
                { nickname: props.message.userNick },
              )}
            >
              <div
                style={{
                  display: 'flex',
                  alignItems: 'center',
                  flexWrap: 'wrap',
                  position: 'relative',
                  left: -5,
                  width: 240,
                }}
              >
                <div
                  style={{ width: 168, display: 'flex', alignItems: 'center', flexWrap: 'wrap' }}
                >
                  {props.message.userNick}
                  {props.message.validSignature ? (
                    <CheckIcon sx={{ height: 16 }} color='success' />
                  ) : (
                    <CloseIcon sx={{ height: 16 }} color='error' />
                  )}
                </div>
                <div style={{ width: 20 }}>
                  <IconButton
                    sx={{ height: 18, width: 18 }}
                    onClick={() =>
                      this.setState((prevState) => {
                        const newShowPGP = [...prevState.showPGP];
                        newShowPGP[props.index] = !newShowPGP[props.index];
                        return { showPGP: newShowPGP };
                      })
                    }
                  >
                    <VisibilityIcon
                      color={this.state.showPGP[props.index] ? 'primary' : 'inherit'}
                      sx={{
                        height: 16,
                        width: 16,
                        color: this.state.showPGP[props.index] ? 'primary' : '#333333',
                      }}
                    />
                  </IconButton>
                </div>
                <div style={{ width: 20 }}>
                  <Tooltip disableHoverListener enterTouchDelay={0} title={t('Copied!')}>
                    <IconButton
                      sx={{ height: 18, width: 18 }}
                      onClick={() =>
                        systemClient.copyToClipboard(
                          this.state.showPGP[props.index]
                            ? props.message.encryptedMessage
                            : props.message.plainTextMessage,
                        )
                      }
                    >
                      <ContentCopy sx={{ height: 16, width: 16, color: '#333333' }} />
                    </IconButton>
                  </Tooltip>
                </div>
              </div>
            </Tooltip>
          }
          subheader={
            this.state.showPGP[props.index] ? (
              <a>
                {' '}
                {props.message.time} <br /> {'Valid signature: ' + props.message.validSignature}{' '}
                <br /> {props.message.encryptedMessage}{' '}
              </a>
            ) : (
              props.message.plainTextMessage
            )
          }
          subheaderTypographyProps={{
            sx: {
              wordWrap: 'break-word',
              width: '200px',
              color: '#444444',
              fontSize: this.state.showPGP[props.index] ? 11 : null,
            },
          }}
        />
      </Card>
    );
  };

  render() {
    const { t } = this.props;
    return (
      <Container component='main'>
        <Grid container spacing={0.5}>
          <Grid item xs={0.3} />
          <Grid item xs={5.5}>
            <Paper
              elevation={1}
              style={
                this.state.connected
                  ? { backgroundColor: '#e8ffe6' }
                  : { backgroundColor: '#FFF1C5' }
              }
            >
              <Typography variant='caption' sx={{ color: '#333333' }}>
                {t('You') + ': '}
                {this.state.connected ? t('connected') : t('disconnected')}
              </Typography>
            </Paper>
          </Grid>
          <Grid item xs={0.4} />
          <Grid item xs={5.5}>
            <Paper
              elevation={1}
              style={
                this.state.peer_connected
                  ? { backgroundColor: '#e8ffe6' }
                  : { backgroundColor: '#FFF1C5' }
              }
            >
              <Typography variant='caption' sx={{ color: '#333333' }}>
                {t('Peer') + ': '}
                {this.state.peer_connected ? t('connected') : t('disconnected')}
              </Typography>
            </Paper>
          </Grid>
          <Grid item xs={0.3} />
        </Grid>
        <div style={{ position: 'relative', left: '-2px', margin: '0 auto', width: '285px' }}>
          <Paper
            elevation={1}
            style={{
              height: '300px',
              maxHeight: '300px',
              width: '285px',
              overflow: 'auto',
              backgroundColor: '#F7F7F7',
            }}
          >
            {this.state.messages.map((message, index) => (
              <li style={{ listStyleType: 'none' }} key={index}>
                {message.userNick == this.props.ur_nick ? (
                  <this.messageCard
                    message={message}
                    index={index}
                    cardColor={'#eeeeee'}
                    userConnected={this.state.connected}
                  />
                ) : (
                  <this.messageCard
                    message={message}
                    index={index}
                    cardColor={'#fafafa'}
                    userConnected={this.state.peer_connected}
                  />
                )}
              </li>
            ))}
            <div
              style={{ float: 'left', clear: 'both' }}
              ref={(el) => {
                this.messagesEnd = el;
              }}
            ></div>
          </Paper>
          <form noValidate onSubmit={this.onButtonClicked}>
            <Grid alignItems='stretch' style={{ display: 'flex' }}>
              <Grid item alignItems='stretch' style={{ display: 'flex' }}>
                <TextField
                  label={t('Type a message')}
                  variant='standard'
                  size='small'
                  helperText={
                    this.state.connected
                      ? this.state.peer_pub_key
                        ? null
                        : t('Waiting for peer public key...')
                      : t('Connecting...')
                  }
                  value={this.state.value}
                  onChange={(e) => {
                    this.setState({ value: e.target.value });
                    this.value = this.state.value;
                  }}
                  sx={{ width: 219 }}
                />
              </Grid>
              <Grid item alignItems='stretch' style={{ display: 'flex' }}>
                <Button
                  sx={{ width: 68 }}
                  disabled={
                    !this.state.connected ||
                    this.state.waitingEcho ||
                    this.state.peer_pub_key == null
                  }
                  type='submit'
                  variant='contained'
                  color='primary'
                >
                  {this.state.waitingEcho ? (
                    <div
                      style={{
                        display: 'flex',
                        alignItems: 'center',
                        flexWrap: 'wrap',
                        minWidth: 68,
                        width: 68,
                        position: 'relative',
                        left: 15,
                      }}
                    >
                      <div style={{ width: 20 }}>
                        <KeyIcon sx={{ width: 18 }} />
                      </div>
                      <div style={{ width: 18 }}>
                        <CircularProgress size={16} thickness={5} />
                      </div>
                    </div>
                  ) : (
                    t('Send')
                  )}
                </Button>
              </Grid>
            </Grid>
          </form>
        </div>

        <div style={{ height: 4 }} />

        <Grid container spacing={0}>
          <AuditPGPDialog
            open={this.state.audit}
            onClose={() => this.setState({ audit: false })}
            orderId={Number(this.props.orderId)}
            messages={this.state.messages}
            own_pub_key={this.state.own_pub_key}
            own_enc_priv_key={this.state.own_enc_priv_key}
            peer_pub_key={this.state.peer_pub_key ? this.state.peer_pub_key : 'Not received yet'}
            passphrase={this.state.token}
            onClickBack={() => this.setState({ audit: false })}
          />

          <Grid item xs={6}>
            <Tooltip
              placement='bottom'
              enterTouchDelay={0}
              enterDelay={500}
              enterNextDelay={2000}
              title={t('Verify your privacy')}
            >
              <Button
                size='small'
                color='primary'
                variant='outlined'
                onClick={() => this.setState({ audit: !this.state.audit })}
              >
                <KeyIcon />
                {t('Audit PGP')}{' '}
              </Button>
            </Tooltip>
          </Grid>

          <Grid item xs={6}>
            <Tooltip
              placement='bottom'
              enterTouchDelay={0}
              enterDelay={500}
              enterNextDelay={2000}
              title={t('Save full log as a JSON file (messages and credentials)')}
            >
              <Button
                size='small'
                color='primary'
                variant='outlined'
                onClick={() =>
                  saveAsJson(
                    'complete_log_chat_' + this.props.orderId + '.json',
                    this.createJsonFile(),
                  )
                }
              >
                <div style={{ width: 28, height: 20 }}>
                  <ExportIcon sx={{ width: 20, height: 20 }} />
                </div>{' '}
                {t('Export')}{' '}
              </Button>
            </Tooltip>
          </Grid>
        </Grid>
      </Container>
    );
  }
}

export default withTranslation()(Chat);