// 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 { pick } from 'lodash';
import React, { Component } from 'react';
import PropTypes from 'prop-types';
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';

import { ETH_TOKEN } from '@parity/shared/util/tokens';
import { fetchCertifiers, fetchCertifications } from '@parity/shared/redux/providers/certifications/actions';
import { Container, SectionList } from '@parity/ui';

import Summary from '../Summary';
import styles from './list.css';

class List extends Component {
  static propTypes = {
    balances: PropTypes.object.isRequired,
    certifications: PropTypes.object.isRequired,
    accounts: PropTypes.object,
    disabled: PropTypes.object,
    empty: PropTypes.bool,
    link: PropTypes.string,
    order: PropTypes.string,
    orderFallback: PropTypes.string,
    search: PropTypes.array,

    fetchCertifiers: PropTypes.func.isRequired,
    fetchCertifications: PropTypes.func.isRequired,
    handleAddSearchToken: PropTypes.func
  };

  componentWillMount () {
    const { accounts, fetchCertifiers, fetchCertifications } = this.props;

    fetchCertifiers();
    for (let address in accounts) {
      fetchCertifications(address);
    }
  }

  render () {
    const { accounts, disabled, empty } = this.props;

    if (empty) {
      return (
        <Container className={ styles.empty }>
          <div>
            There are currently no accounts or addresses to display.
          </div>
        </Container>
      );
    }

    const addresses = this
      .getAddresses()
      .map((address) => {
        const account = accounts[address] || {};
        const isDisabled = disabled ? disabled[address] : false;
        const owners = account.owners || null;

        return {
          account,
          isDisabled,
          owners
        };
      });

    return (
      <SectionList
        items={ addresses }
        renderItem={ this.renderSummary }
      />
    );
  }

  renderSummary = (item) => {
    const { account, isDisabled, owners } = item;
    const { handleAddSearchToken, link } = this.props;

    return (
      <Summary
        account={ account }
        disabled={ isDisabled }
        handleAddSearchToken={ handleAddSearchToken }
        link={ link }
        owners={ owners }
        showCertifications
      />
    );
  }

  getAddresses () {
    const filteredAddresses = this.getFilteredAddresses();

    return this.sortAddresses(filteredAddresses);
  }

  sortAddresses (addresses) {
    const { order, orderFallback } = this.props;

    if (!order) {
      return addresses;
    }

    const { accounts } = this.props;

    return addresses.sort((addressA, addressB) => {
      const accountA = accounts[addressA];
      const accountB = accounts[addressB];

      const sort = this.compareAccounts(accountA, accountB, order);

      if (sort === 0 && orderFallback) {
        return this.compareAccounts(accountA, accountB, orderFallback);
      }

      return sort;
    });
  }

  compareAccounts (accountA, accountB, key, _reverse = null) {
    if (key && key.split(':')[1] === '-1') {
      return this.compareAccounts(accountA, accountB, key.split(':')[0], true);
    }

    if (key === 'timestamp' && _reverse === null) {
      return this.compareAccounts(accountA, accountB, key, true);
    }

    if (key === 'name') {
      return accountA.name.localeCompare(accountB.name);
    }

    if (key === 'eth') {
      const { balances } = this.props;

      const balanceA = balances[accountA.address];
      const balanceB = balances[accountB.address];

      if (!balanceA && !balanceB) {
        return 0;
      } else if (balanceA && !balanceB) {
        return -1;
      } else if (!balanceA && balanceB) {
        return 1;
      }

      const ethA = balanceA[ETH_TOKEN.id];
      const ethB = balanceB[ETH_TOKEN.id];

      if (!ethA && !ethB) {
        return 0;
      } else if (ethA && !ethB) {
        return -1;
      } else if (!ethA && ethB) {
        return 1;
      }

      return -1 * ethA.comparedTo(ethB);
    }

    if (key === 'tags') {
      const tagsA = [].concat(accountA.meta.tags)
        .filter(t => t)
        .sort()
        .join('');

      const tagsB = [].concat(accountB.meta.tags)
        .filter(t => t)
        .sort()
        .join('');

      if (!tagsA && !tagsB) {
        return 0;
      } else if (tagsA && !tagsB) {
        return -1;
      } else if (!tagsA && tagsB) {
        return 1;
      }

      return tagsA.localeCompare(tagsB);
    }

    const reverse = _reverse
      ? -1
      : 1;

    const metaA = accountA.meta[key];
    const metaB = accountB.meta[key];

    if (!metaA && !metaB) {
      return 0;
    }

    if (metaA && !metaB) {
      return -1;
    }

    if (metaA < metaB) {
      return -1 * reverse;
    }

    if (!metaA && metaB) {
      return 1;
    }

    if (metaA > metaB) {
      return 1 * reverse;
    }

    return 0;
  }

  getFilteredAddresses () {
    const { accounts, search } = this.props;
    const searchValues = (search || []).map(v => v.toLowerCase());

    if (searchValues.length === 0) {
      return Object.keys(accounts);
    }

    return Object.keys(accounts)
      .filter((address) => {
        const account = accounts[address];

        const tags = account.meta.tags || [];
        const name = account.name || '';

        const values = tags
          .concat(name)
          .map(v => v.toLowerCase());

        return searchValues
          .map(searchValue => {
            return values
              .some(value => value.indexOf(searchValue) >= 0);
          })
          // `current && truth, true` => use tokens as AND
          // `current || truth, false` => use tokens as OR
          .reduce((current, truth) => current && truth, true);
      });
  }
}

function mapStateToProps (state, props) {
  const addresses = Object.keys(props.accounts);
  const balances = pick(state.balances, addresses);
  const { certifications } = state;

  return { balances, certifications };
}

function mapDispatchToProps (dispatch) {
  return bindActionCreators({
    fetchCertifiers,
    fetchCertifications
  }, dispatch);
}

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