swimtracker-app/state/Reducer.js

import { combineReducers } from 'redux';
import { List } from 'immutable';
import { CHANGE_THEME, CHANGE_USER_NAME, NEW_DEVICE_DATA, START_SESSION, STOP_SESSION } from './ActionCreators';

const INITIAL_SETTINGS = {
    theme: "hot",
    username: "",
    deviceURL: "http://192.168.178.105",
    peaksPerLap: 30,

    // advanced
    peakDetector: 'SIMPLE', // either 'SIMPLE' or 'ZSCORE'
    peakDetectorSimpleThreshold: 2000,

    peakDetectorZScoreLag: 8, // peak detector z-score values
    peakDetectorZScoreThreshold: 2,
    peakDetectorZScoreInfluence: 0.1,
};

const INITIAL_CURRENT_SESSION = {
    running: false,
    rawData: List(),
    analysis: {
        'peaks': List(),
        'totalTime': null,
        'activeTime': null,
        'totalMomentum': null,
        'peakFrequency': null,
        'peakMax': null,
        // windowed quantities
        'momentumWindow': null,
        'frequencyWindow': null,
        'peakMaxWindow': null,
    }
};

const settingsReducer = (state = INITIAL_SETTINGS, action) => {
    switch (action.type) {
        case CHANGE_THEME:
            return { ...state, theme: action.newThemeName };
        case CHANGE_USER_NAME:
            return { ...state, username: action.newUsername };
        default:
            return state
    }
};

const currentSessionReducer = (state = INITIAL_CURRENT_SESSION, action) => {
    switch (action.type) {
        case START_SESSION:
            return {
                running: true,
                rawData: List(),
                analysis: INITIAL_CURRENT_SESSION.analysis
            };
        case STOP_SESSION:
            return {
                running: false,
                rawData: List(),
                analysis: INITIAL_CURRENT_SESSION.analysis
            };
        case NEW_DEVICE_DATA:
            return {
                running: action.data.size > 0,
                rawData: action.data,
                analysis: { ...state.analysis, ...action.analysis },
            }
        default:
            return state
    }
};

export default combineReducers({
    settings: settingsReducer,
    session: currentSessionReducer,
});