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

class AddedRecordsReducerImpl implements ActionReducer{
    
    public sliceName: string = "hist::addedRecords";

    public reduce(_stateManager:StateManager, currentState: Array<Record>, action: StateAction): Array<Record>|undefined {
        switch(action.type){
            case Action.RECORDS_ADDED:
            case Action.RECORDS_COPIED:
                return (currentState||[]).concat(action.payload);
            case Action.DATA_SAVED:
            case Action.EDITION_CANCELED:
                return undefined;
        }
        return currentState;
    }
}

export const AddedRecordsReducer = new AddedRecordsReducerImpl();

export const getAddedRecords = (stateManager: StateManager): Array<Record> => {
    return stateManager.select(AddedRecordsReducer.sliceName, (state: Array<Record>) => state);
};

export const isAddedRecord = (recordId: string, stateManager: StateManager): boolean => {
    const addedRecords = getAddedRecords(stateManager);
    
    if(addedRecords == undefined || addedRecords.length === 0){
        return false;
    }

    return addedRecords.some(record => record.__record__id__ === recordId);
}

export const prepareAddedRecordId = (stateManager: StateManager, source: Array<any>, parentRecordId?: string): Array<Record> => {
    let index = (getAddedRecords(stateManager) || []).length;
    return source.map(item => ({
        ...item,
        __record__id__: `NEW_${index++}`,
        ...(parentRecordId && { __parent__record__id__: parentRecordId }),
    }));
};

export const prepareCopiedRecord = (stateManager: StateManager, source: Array<Record>, parentRecordId?: string): Array<Record> => {
    let index = (getAddedRecords(stateManager)||[]).length;
    return source.map(item => ({
        ...item,
        __record__id__: "NEW_" + (index++),
        ...(parentRecordId && { __parent__record__id__: parentRecordId }),
        __record__source__id__: item.__record__id__,
        __copy__: true})
    );
};