// 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/>.

const initialState = {};

export default (state = initialState, action) => {
  if (action.type === 'addCertification') {
    const { address, id, name, icon, title } = action;
    const certifications = state[address] || [];
    const certifierIndex = certifications.findIndex((c) => c.id === id);
    const data = { id, name, icon, title };
    const nextCertifications = certifications.slice();

    if (certifierIndex >= 0) {
      nextCertifications[certifierIndex] = data;
    } else {
      nextCertifications.push(data);
    }

    return { ...state, [address]: nextCertifications };
  }

  if (action.type === 'removeCertification') {
    const { address, id } = action;
    const certifications = state[address] || [];
    const certifierIndex = certifications.findIndex((c) => c.id === id);

    // Don't remove if not there
    if (certifierIndex < 0) {
      return state;
    }

    const newCertifications = certifications.slice();

    newCertifications.splice(certifierIndex, 1);
    return { ...state, [address]: newCertifications };
  }

  return state;
};