import log from '../log/log';

const CHANGE_STROKE_WIDTH = 'scratch-paint/stroke-width/CHANGE_STROKE_WIDTH';
const MAX_STROKE_WIDTH = 400;
const initialState = 2;

const reducer = function (state, action) {
    if (typeof state === 'undefined') state = initialState;
    switch (action.type) {
    case CHANGE_STROKE_WIDTH:
        if (isNaN(action.strokeWidth)) {
            log.warn(`Invalid brush size: ${action.strokeWidth}`);
            return state;
        }
        return Math.min(MAX_STROKE_WIDTH, Math.max(0, action.strokeWidth));
    default:
        return state;
    }
};

// Action creators ==================================
const changeStrokeWidth = function (strokeWidth) {
    return {
        type: CHANGE_STROKE_WIDTH,
        strokeWidth: strokeWidth
    };
};

export {
    reducer as default,
    changeStrokeWidth,
    MAX_STROKE_WIDTH
};