// 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 flatten from 'lodash.flatten';

import { sha3 } from '@parity/api/lib/util/sha3';
import VisibleStore from '@parity/shared/lib/mobx/dappsStore';

import RequestStore from './DappRequests/store';
import filteredRequests from './DappRequests/filteredRequests';

export default function execute (appId, method, params, callback) {
  const visibleStore = VisibleStore.get();
  const requestStore = RequestStore.get();

  switch (method) {
    case 'shell_getApps':
      const [displayAll] = params;

      callback(null, displayAll
        ? visibleStore.allApps.slice()
        : visibleStore.visibleApps.slice()
      );
      return true;

    case 'shell_getFilteredMethods':
      callback(null, flatten(
        Object
          .keys(filteredRequests)
          .map((key) => filteredRequests[key].methods)
      ));
      return true;

    case 'shell_getMethodPermissions':
      callback(null, requestStore.permissions);
      return true;

    case 'shell_loadApp':
      const [_loadId, loadParams] = params;
      const loadId = _loadId.substr(0, 2) !== '0x'
        ? sha3(_loadId)
        : _loadId;
      const loadUrl = `/${loadId}/${loadParams || ''}`;

      window.location.hash = loadUrl;

      callback(null, true);
      return true;

    case 'shell_requestNewToken':
      callback(null, requestStore.createToken(appId));
      return true;

    case 'shell_setAppVisibility':
      const [changeId, visibility] = params;

      callback(null, visibility
        ? visibleStore.showApp(changeId)
        : visibleStore.hideApp(changeId)
      );
      return true;

    case 'shell_setMethodPermissions':
      const [permissions] = params;

      callback(null, requestStore.setPermissions(permissions));
      return true;

    default:
      return false;
  }
}
