// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.

// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity.  If not, see <http://www.gnu.org/licenses/>.

import React from 'react';
import PropTypes from 'prop-types';
import { FormattedMessage } from 'react-intl';
import { connect } from 'react-redux';

import styles from './blockStatus.css';

function BlockStatus ({ blockNumber, syncing }) {
  if (!blockNumber) {
    return null;
  }

  if (!syncing) {
    return (
      <div className={ styles.blockNumber }>
        <FormattedMessage
          id='ui.blockStatus.bestBlock'
          defaultMessage='{blockNumber} best block'
          values={ {
            blockNumber: blockNumber.toFormat()
          } }
        />
      </div>
    );
  }

  if (syncing.warpChunksAmount && syncing.warpChunksProcessed && !syncing.warpChunksAmount.eq(syncing.warpChunksProcessed)) {
    return (
      <div className={ styles.syncStatus }>
        <FormattedMessage
          id='ui.blockStatus.warpRestore'
          defaultMessage='{percentage}% warp restore'
          values={ {
            percentage: syncing.warpChunksProcessed.mul(100).div(syncing.warpChunksAmount).toFormat(2)
          } }
        />
      </div>
    );
  }

  let syncStatus = null;
  let warpStatus = null;

  if (syncing.currentBlock && syncing.highestBlock) {
    syncStatus = (
      <span>
        <FormattedMessage
          id='ui.blockStatus.syncStatus'
          defaultMessage='{currentBlock}/{highestBlock} syncing'
          values={ {
            currentBlock: syncing.currentBlock.toFormat(),
            highestBlock: syncing.highestBlock.toFormat()
          } }
        />
      </span>
    );
  }

  if (syncing.blockGap) {
    const [first, last] = syncing.blockGap;

    warpStatus = (
      <span>
        <FormattedMessage
          id='ui.blockStatus.warpStatus'
          defaultMessage=', {percentage}% historic'
          values={ {
            percentage: first.mul(100).div(last).toFormat(2)
          } }
        />
      </span>
    );
  }

  return (
    <div className={ styles.syncStatus }>
      { syncStatus }
      { warpStatus }
    </div>
  );
}

BlockStatus.propTypes = {
  blockNumber: PropTypes.object,
  syncing: PropTypes.oneOfType([
    PropTypes.bool,
    PropTypes.object
  ])
};

function mapStateToProps (state) {
  const { blockNumber, syncing } = state.nodeStatus;

  return {
    blockNumber,
    syncing
  };
}

export default connect(
  mapStateToProps,
  null
)(BlockStatus);