import { PageItem } from "../../../event/core/event-runner";
import { DataLayerFrontClickEvent } from "./datalayer-front-click";
import { DataLayerFrontViewEvent } from "./datalayer-front-view";
import { DataLayerSearchClickEvent } from "./datalayer-search-click";
import { DataLayerSearchQueryEvent } from "./datalayer-search-query";

/**
 * Event types for datalayer events.
 *
 * @enum {string}
 */
enum DataLayerEventType {
    SearchQuery = "biggy.search.query",
    SearchClick = "biggy.search.click",

    FrontView = "biggy.front.view",
    FrontClick = "biggy.front.click",
}

type DataLayerEvent =
    | DataLayerFrontClickEvent
    | DataLayerFrontViewEvent
    | DataLayerSearchClickEvent
    | DataLayerSearchQueryEvent;

/**
 * Construct a `DataLayerEvent` from an layer.
 *
 * @export
 * @param {*} item
 * @return {DataLayerEvent}
 */
export function fromItem(item: PageItem): DataLayerEvent {
    if (!item || !item.event || !item.biggy) {
        return;
    }

    switch (item.event) {
        case DataLayerEventType.SearchQuery:
            return new DataLayerSearchQueryEvent(item.biggy);
        case DataLayerEventType.SearchClick:
            return new DataLayerSearchClickEvent(item.biggy);

        case DataLayerEventType.FrontView:
            return new DataLayerFrontViewEvent(item.biggy);
        case DataLayerEventType.FrontClick:
            return new DataLayerFrontClickEvent(item.biggy);

        default:
            return;
    }
}