import moment from 'moment';
import concatUnique from 'misago/utils/concat-unique';

export const APPEND_USERS = 'APPEND_USERS';
export const HYDRATE_USERS = 'HYDRATE_USERS';
export const UPDATE_AVATAR = 'UPDATE_AVATAR';
export const UPDATE_USERNAME = 'UPDATE_USERNAME';

export function append(items) {
  return {
    type: APPEND_USERS,
    items
  };
}

export function hydrate(items) {
  return {
    type: HYDRATE_USERS,
    items
  };
}

export function hydrateStatus(status) {
  if (status) {
    return Object.assign({}, status, {
      last_click: status.last_click ? moment(status.last_click) : null,
      banned_until: status.banned_until ? moment(status.banned_until) : null
    });
  } else {
    return null;
  }
}

export function hydrateUser(user) {
  return Object.assign({}, user, {
    joined_on: moment(user.joined_on),
    status: hydrateStatus(user.status)
  });
}

export function updateAvatar(user, avatars) {
  return {
    type: UPDATE_AVATAR,
    userId: user.id,
    avatars
  };
}

export function updateUsername(user, username, slug) {
  return {
    type: UPDATE_USERNAME,
    userId: user.id,
    username,
    slug
  };
}

export default function user(state=[], action=null) {
  switch (action.type) {
    case APPEND_USERS:
      let mergedState = concatUnique(state, action.items.map(hydrateUser));

      return mergedState.sort(function(a, b) {
        if (a.username < b.username) {
          return -1;
        } else if (a.username > b.username) {
          return 1;
        } else {
          return 0;
        }
      });

    case HYDRATE_USERS:
      return action.items.map(hydrateUser);

    case UPDATE_AVATAR:
      return state.map(function(item) {
        item = Object.assign({}, item);
        if (item.id === action.userId) {
          item.avatars = action.avatars;
        }

        return item;
      });

    default:
      return state;
  }
}