import Immutable from "seamless-immutable";

export const types = {
  REQUEST_CHOOSE_USERNAME: "USER/REQUEST_CHOOSE_USERNAME",
  SET_CURRENT_PLAYER: "USER/SET_CURRENT_PLAYER",
  UPDATE_PLAYERS: "USER/UPDATE_PLAYERS"
};

export const actions = {
  chooseUsername: username => ({
    type: types.REQUEST_CHOOSE_USERNAME,
    username
  }),
  setCurrentPlayer: player => ({
    type: types.SET_CURRENT_PLAYER,
    player
  }),
  updatePlayers: players => ({
    type: types.UPDATE_PLAYERS,
    players
  })
};

const initialState = Immutable.from({
  all: {},
  current: ""
});

export default (state = initialState, action) => {
  switch (action.type) {
    case types.SET_CURRENT_PLAYER:
      const player = action.player;
      const withNewPlayer = state.setIn(["all", player.username], player);
      return Immutable.set(withNewPlayer, "current", player.username);
    case types.UPDATE_PLAYERS:
      return Immutable.merge(state, { all: action.players }, { deep: true });
    default:
      return state;
  }
};

export const getCurrentPlayer = state =>
  state.players.all && state.players.all[state.players.current];
export const getPlayer = (state, username) => state.players.all[username];
export const getPlayers = (state, usernames) =>
  usernames.map(u => getPlayer(state, u));