src/reducers/interaction-level.js


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import {
    GO_DOWN_ONE_INTERACTION_LEVEL,
    GO_FROM_BUILDING_TO_ROOM,
    GO_FROM_ROOM_TO_OBJECT
} from "../actions/interaction-level";

export function interactionLevel(state = {mode: "BUILDING"}, action) {
    switch (action.type) {
        case GO_FROM_BUILDING_TO_ROOM:
            return {
                mode: "ROOM",
                roomId: action.roomId
            };
        case GO_FROM_ROOM_TO_OBJECT:
            return {
                mode: "OBJECT",
                roomId: state.roomId,
                tileId: action.tileId
            };
        case GO_DOWN_ONE_INTERACTION_LEVEL:
            if (state.mode === "ROOM") {
                return {
                    mode: "BUILDING"
                };
            } else if (state.mode === "OBJECT") {
                return {
                    mode: "ROOM",
                    roomId: state.roomId
                };
            } else {
                return state;
            }
        default:
            return state;
    }
}