import {LoadableContent} from '../../model/loadable-content';
import {NegativeKeywords} from '../../model/recommendations';
import {
    FAILED_TO_LOAD_NEGATIVE_KEYWORDS,
    LOAD_NEGATIVE_KEYWORDS,
    LOADED_NEGATIVE_KEYWORDS,
    NegativeKeywordsAction
} from '../actions/negative-keywords';

export interface NegativeKeywordsState {
    negativeKeywords: LoadableContent<NegativeKeywords>;
}


const initialState: NegativeKeywordsState = {
    negativeKeywords: LoadableContent.loaded(new NegativeKeywords([], 0))
};

export function negativeKeywordsReducer(state: NegativeKeywordsState = initialState,
                                           action: NegativeKeywordsAction): NegativeKeywordsState {
    switch (action.type) {

        case LOAD_NEGATIVE_KEYWORDS:
            return {
                negativeKeywords: LoadableContent.loading()
            };

        case LOADED_NEGATIVE_KEYWORDS:
            return {
                negativeKeywords: LoadableContent.loaded(action.result)
            };

        case FAILED_TO_LOAD_NEGATIVE_KEYWORDS:
            return {
                negativeKeywords: LoadableContent.failedToLoad()
            };

        default:
            return state;
    }
}

export const selectNegativeKeywords = (state: NegativeKeywordsState) => state.negativeKeywords;