// Copyright 2015, 2016 Ethcore (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, { Component, PropTypes } from 'react';
import IconMenu from 'material-ui/IconMenu';
import MenuItem from 'material-ui/MenuItem';

import FileSaver from 'file-saver';
import json2csv from 'json2csv';
import FileDownloadIcon from 'material-ui/svg-icons/file/file-download';

import { Button } from '../../';

class ActionbarExport extends Component {
  static propTypes = {
    content: PropTypes.oneOfType([
      PropTypes.string,
      PropTypes.object
    ]).isRequired,
    filename: PropTypes.string.isRequired,
    className: PropTypes.string
  }

  state = {
    menuOpen: false
  }

  render () {
    const { className } = this.props;

    return (
      <IconMenu
        iconButtonElement={
          <Button
            className={ className }
            icon={ <FileDownloadIcon /> }
            label='export'
            onClick={ this.handleMenuOpen }
          />
        }
        open={ this.state.menuOpen }
        onRequestChange={ this.handleMenuChange }
        onItemTouchTap={ this.handleExport }
        targetOrigin={ { horizontal: 'right', vertical: 'top' } }
        anchorOrigin={ { horizontal: 'right', vertical: 'top' } }
        >
        <MenuItem value='json' primaryText='Export to JSON' />
        <MenuItem value='csv' primaryText='Export to CSV' />
      </IconMenu>
    );
  }

  onDownloadBackup = (filetype) => {
    const { filename, content } = this.props;

    const text = this.contentAsString(content, filetype);
    const extension = this.getExtension(filetype);

    const blob = new Blob([ text ], { type: 'text/plain;charset=utf-8' });
    FileSaver.saveAs(blob, `${filename}.${extension}`);
  }

  getExtension = (filetype) => {
    switch (filetype) {
      case 'json':
      case 'csv':
        return filetype;
      default:
        return 'txt';
    }
  }

  contentAsString = (data, filetype) => {
    if (typeof data === 'string') {
      return data;
    }

    switch (filetype) {
      case 'json':
        return JSON.stringify(data, null, 4);
      case 'csv':
        return this.toCSV(data);
      default:
        return data.toString();
    }
  }

  toCSV = (data) => {
    const json = Object.values(data);
    console.log(json);
    return json2csv({ data: json });
  }

  handleExport = (event, child) => {
    const type = child.props.value;
    this.onDownloadBackup(type);
  }

  handleMenuOpen = () => {
    this.setState({ menuOpen: true });
  }

  handleMenuChange = (open) => {
    this.setState({ menuOpen: open });
  }
}

export default ActionbarExport;