// Copyright 2015, 2016 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, { Component, PropTypes } from 'react';
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';
import ActionDelete from 'material-ui/svg-icons/action/delete';
import AvPlayArrow from 'material-ui/svg-icons/av/play-arrow';
import ContentCreate from 'material-ui/svg-icons/content/create';
import EyeIcon from 'material-ui/svg-icons/image/remove-red-eye';
import ContentClear from 'material-ui/svg-icons/content/clear';

import { newError } from '~/redux/actions';
import { setVisibleAccounts } from '~/redux/providers/personalActions';

import { EditMeta, ExecuteContract } from '~/modals';
import { Actionbar, Button, Page, Modal, Editor } from '~/ui';

import Header from '../Account/Header';
import Delete from '../Address/Delete';

import Events from './Events';
import Queries from './Queries';

import styles from './contract.css';

class Contract extends Component {
  static contextTypes = {
    api: React.PropTypes.object.isRequired
  };

  static propTypes = {
    setVisibleAccounts: PropTypes.func.isRequired,

    accounts: PropTypes.object,
    balances: PropTypes.object,
    contracts: PropTypes.object,
    isTest: PropTypes.bool,
    params: PropTypes.object
  };

  state = {
    contract: null,
    fromAddress: '',
    showDeleteDialog: false,
    showEditDialog: false,
    showExecuteDialog: false,
    showDetailsDialog: false,
    subscriptionId: -1,
    blockSubscriptionId: -1,
    allEvents: [],
    minedEvents: [],
    pendingEvents: [],
    queryValues: {},
    loadingEvents: true
  };

  componentDidMount () {
    const { api } = this.context;

    this.attachContract(this.props);
    this.setBaseAccount(this.props);
    this.setVisibleAccounts();

    api
      .subscribe('eth_blockNumber', this.queryContract)
      .then(blockSubscriptionId => this.setState({ blockSubscriptionId }));
  }

  componentWillReceiveProps (nextProps) {
    const { accounts, contracts } = nextProps;

    if (Object.keys(contracts).length !== Object.keys(this.props.contracts).length) {
      this.attachContract(nextProps);
    }

    if (Object.keys(accounts).length !== Object.keys(this.props.accounts).length) {
      this.setBaseAccount(nextProps);
    }

    const prevAddress = this.props.params.address;
    const nextAddress = nextProps.params.address;

    if (prevAddress !== nextAddress) {
      this.setVisibleAccounts(nextProps);
    }
  }

  componentWillUnmount () {
    const { api } = this.context;
    const { subscriptionId, blockSubscriptionId, contract } = this.state;

    api.unsubscribe(blockSubscriptionId);
    contract.unsubscribe(subscriptionId);
    this.props.setVisibleAccounts([]);
  }

  setVisibleAccounts (props = this.props) {
    const { params, setVisibleAccounts } = props;
    const addresses = [ params.address ];
    setVisibleAccounts(addresses);
  }

  render () {
    const { balances, contracts, params, isTest } = this.props;
    const { allEvents, contract, queryValues, loadingEvents } = this.state;
    const account = contracts[params.address];
    const balance = balances[params.address];

    if (!account) {
      return null;
    }

    return (
      <div>
        { this.renderActionbar(account) }
        { this.renderDeleteDialog(account) }
        { this.renderEditDialog(account) }
        { this.renderExecuteDialog() }
        <Page>
          <Header
            account={ account }
            balance={ balance }
            isContract
          />

          <Queries
            contract={ contract }
            values={ queryValues }
          />

          <Events
            isTest={ isTest }
            isLoading={ loadingEvents }
            events={ allEvents }
          />

          { this.renderDetails(account) }
        </Page>
      </div>
    );
  }

  renderDetails (contract) {
    const { showDetailsDialog } = this.state;

    if (!showDetailsDialog) {
      return null;
    }

    const cancelBtn = (
      <Button
        icon={ <ContentClear /> }
        label='Close'
        onClick={ this.closeDetailsDialog } />
    );

    return (
      <Modal
        actions={ [ cancelBtn ] }
        title={ 'contract details' }
        visible
      >
        <div className={ styles.details }>
          { this.renderSource(contract) }

          <div>
            <h4>Contract ABI</h4>
            <Editor
              value={ JSON.stringify(contract.meta.abi, null, 2) }
              mode='json'
              maxLines={ 20 }
              readOnly
            />
          </div>
        </div>
      </Modal>
    );
  }

  renderSource (contract) {
    const { source } = contract.meta;

    if (!source) {
      return null;
    }

    return (
      <div>
        <h4>Contract source code</h4>
        <Editor
          value={ source }
          readOnly
        />
      </div>
    );
  }

  renderActionbar (account) {
    const buttons = [
      <Button
        key='execute'
        icon={ <AvPlayArrow /> }
        label='execute'
        onClick={ this.showExecuteDialog } />,
      <Button
        key='editmeta'
        icon={ <ContentCreate /> }
        label='edit'
        onClick={ this.showEditDialog } />,
      <Button
        key='delete'
        icon={ <ActionDelete /> }
        label='delete contract'
        onClick={ this.showDeleteDialog } />,
      <Button
        key='viewDetails'
        icon={ <EyeIcon /> }
        label='view details'
        onClick={ this.showDetailsDialog } />
    ];

    return (
      <Actionbar
        title='Contract Information'
        buttons={ !account ? [] : buttons } />
    );
  }

  renderDeleteDialog (account) {
    const { showDeleteDialog } = this.state;

    return (
      <Delete
        account={ account }
        visible={ showDeleteDialog }
        route='/contracts'
        onClose={ this.closeDeleteDialog } />
    );
  }

  renderEditDialog (account) {
    const { showEditDialog } = this.state;

    if (!showEditDialog) {
      return null;
    }

    return (
      <EditMeta
        account={ account }
        onClose={ this.closeEditDialog } />
    );
  }

  renderExecuteDialog () {
    const { contract, fromAddress, showExecuteDialog } = this.state;
    const { accounts } = this.props;

    if (!showExecuteDialog) {
      return null;
    }

    return (
      <ExecuteContract
        accounts={ accounts }
        contract={ contract }
        fromAddress={ fromAddress }
        onClose={ this.closeExecuteDialog }
        onFromAddressChange={ this.onFromAddressChange } />
    );
  }

  queryContract = () => {
    const { contract } = this.state;

    if (!contract) {
      return;
    }

    const queries = contract.functions
      .filter((fn) => fn.constant)
      .filter((fn) => !fn.inputs.length);

    Promise
      .all(queries.map((query) => query.call()))
      .then(results => {
        const values = queries.reduce((object, fn, idx) => {
          const key = fn.name;
          object[key] = results[idx];
          return object;
        }, {});

        this.setState({ queryValues: values });
      })
      .catch((error) => {
        console.error('queryContract', error);
      });
  }

  closeEditDialog = () => {
    this.setState({ showEditDialog: false });
  }

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

  closeDeleteDialog = () => {
    this.setState({ showDeleteDialog: false });
  }

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

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

  closeDetailsDialog = () => {
    this.setState({ showDetailsDialog: false });
  }

  closeExecuteDialog = () => {
    this.setState({ showExecuteDialog: false });
  }

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

  _sortEvents = (a, b) => {
    return b.blockNumber.cmp(a.blockNumber) || b.logIndex.cmp(a.logIndex);
  }

  _logToEvent = (log) => {
    const { api } = this.context;
    const key = api.util.sha3(JSON.stringify(log));
    const { address, blockNumber, logIndex, transactionHash, transactionIndex, params, type } = log;

    return {
      type: log.event,
      state: type,
      address,
      blockNumber,
      logIndex,
      transactionHash,
      transactionIndex,
      params,
      key
    };
  }

  _receiveEvents = (error, logs) => {
    if (this.state.loadingEvents) {
      this.setState({ loadingEvents: false });
    }

    if (error) {
      console.error('_receiveEvents', error);
      return;
    }

    const events = logs.map(this._logToEvent);
    const minedEvents = events
      .filter((event) => event.state === 'mined')
      .reverse()
      .concat(this.state.minedEvents)
      .sort(this._sortEvents);
    const pendingEvents = events
      .filter((event) => event.state === 'pending')
      .reverse()
      .concat(this.state.pendingEvents.filter((pending) => {
        return !events.find((event) => {
          const isMined = (event.state === 'mined') && (event.transactionHash === pending.transactionHash);
          const isPending = (event.state === 'pending') && (event.key === pending.key);

          return isMined || isPending;
        });
      }))
      .sort(this._sortEvents);
    const allEvents = pendingEvents.concat(minedEvents);

    this.setState({
      allEvents,
      minedEvents,
      pendingEvents
    });
  }

  attachContract (props) {
    if (!props) {
      return;
    }

    const { api } = this.context;
    const { contracts, params } = props;
    const account = contracts[params.address];

    if (!account) {
      return;
    }

    const contract = api.newContract(account.meta.abi, params.address);
    contract
      .subscribe(null, { limit: 25, fromBlock: 0, toBlock: 'pending' }, this._receiveEvents)
      .then((subscriptionId) => {
        this.setState({ subscriptionId });
      });

    this.setState({ contract }, this.queryContract);
  }

  setBaseAccount (props) {
    const { fromAccount } = this.state;

    if (!props || fromAccount) {
      return;
    }

    const { accounts } = props;

    this.setState({
      fromAddress: Object.keys(accounts)[0]
    });
  }

  onFromAddressChange = (event, fromAddress) => {
    this.setState({
      fromAddress
    });
  }
}

function mapStateToProps (state) {
  const { accounts, contracts } = state.personal;
  const { balances } = state.balances;
  const { isTest } = state.nodeStatus;

  return {
    isTest,
    accounts,
    contracts,
    balances
  };
}

function mapDispatchToProps (dispatch) {
  return bindActionCreators({
    newError,
    setVisibleAccounts
  }, dispatch);
}

export default connect(
  mapStateToProps,
  mapDispatchToProps
)(Contract);