import { ActionReducer, StateAction } from "../StateManager.js";
import { Action } from "../action/DataUnitAction.js";
import StateManager from "../StateManager.js";

class LoadingPropertiesImpl implements ActionReducer{
    
    public sliceName: string = "loadingProperties";

    public reduce(_stateManager:StateManager, currentState: Map<string, string>, action: StateAction): Map<string, string>|undefined {
        switch(action.type){
            case Action.LOADING_PROPERTY_ADDED:
                return buildNewState(currentState, action.payload);
            case Action.LOADING_PROPERTIES_CLEANED:
                return undefined;
        }
        return currentState;
    }
}

export const LoadingPropertiesReducer = new LoadingPropertiesImpl();

export const getLoadingProperties = (stateManager: StateManager): Map<string, string>|undefined => {
    return stateManager.select(LoadingPropertiesReducer.sliceName, (state: Map<string, string>) => state);
};

function buildNewState(currentState: Map<string, string>, payload: any): Map<string, string>{
    const newState =  new Map(currentState);
    if(payload != undefined){
        for (const [key, value] of Object.entries(payload)) {
            if(typeof key === "string" && typeof value === "string"){
                newState.set(key, value);
            }
        }
    }
    return newState;
}