// 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 TxHash from '../../../ui/TxHash';

import { sha3 } from '../../../api/util/sha3';
import waitForConfirmations from '../wait-for-confirmations';

import styles from './sendConfirmation.css';

export default class SendConfirmation extends Component {
  static contextTypes = {
    api: PropTypes.object.isRequired
  }

  static propTypes = {
    account: PropTypes.string.isRequired,
    contract: PropTypes.object.isRequired,
    data: PropTypes.object.isRequired,
    onData: PropTypes.func.isRequired,
    onSuccess: PropTypes.func.isRequired,
    onError: PropTypes.func.isRequired
  }

  state = {
    init: true,
    step: 'init'
  };

  componentWillMount () {
    const { init } = this.state;
    if (init) {
      this.send();
      this.setState({ init: false });
    }
  }

  render () {
    const { step } = this.state;

    if (step === 'error') {
      return (<p>{ this.state.error }</p>);
    }

    if (step === 'pending') {
      return (<p>Waiting for authorization by the Parity Signer.</p>);
    }

    if (step === 'posted') {
      return (
        <div className={ styles.centered }>
          <TxHash hash={ this.props.data.txHash } maxConfirmations={ 3 } />
          <p>Please keep this window open.</p>
        </div>);
    }

    if (step === 'mined') {
      return (<p>Congratulations, your account is verified!</p>);
    }

    return null;
  }

  send = () => {
    const { api } = this.context;
    const { account, contract, onData, onError, onSuccess } = this.props;

    const { code } = this.props.data;
    const token = sha3(code);

    const confirm = contract.functions.find((fn) => fn.name === 'confirm');
    const options = { from: account };
    const values = [ token ];

    confirm.estimateGas(options, values)
      .then((gas) => {
        options.gas = gas.mul(1.2).toFixed(0);
        // TODO: show message
        this.setState({ step: 'pending' });
        return confirm.postTransaction(options, values);
      })
      .then((handle) => {
        // TODO: The "request rejected" error doesn't have any property to
        // distinguish it from other errors, so we can't give a meaningful error here.
        return api.pollMethod('parity_checkRequest', handle);
      })
      .then((txHash) => {
        onData({ txHash: txHash });
        this.setState({ step: 'posted' });
        return waitForConfirmations(api, txHash, 3);
      })
      .then(() => {
        this.setState({ step: 'mined' });
        onSuccess();
      })
      .catch((err) => {
        console.error('failed to confirm sms verification', err);
        onError(err);
        this.setState({
          step: 'error',
          error: 'Failed to send the verification code: ' + err.message
        });
        // TODO: show message in SnackBar
      });
  }
}