import { getNextFlightSegmentPath } from '../../flight-data-helpers';
import { createRouterCacheKey } from './create-router-cache-key';
/**
 * This will clear the CacheNode data for a particular segment path. This will cause a lazy-fetch in layout router to fill in new data.
 */ export function clearCacheNodeDataForSegmentPath(newCache, existingCache, flightSegmentPath) {
    const isLastEntry = flightSegmentPath.length <= 2;
    const [parallelRouteKey, segment] = flightSegmentPath;
    const cacheKey = createRouterCacheKey(segment);
    const existingChildSegmentMap = existingCache.parallelRoutes.get(parallelRouteKey);
    let childSegmentMap = newCache.parallelRoutes.get(parallelRouteKey);
    if (!childSegmentMap || childSegmentMap === existingChildSegmentMap) {
        childSegmentMap = new Map(existingChildSegmentMap);
        newCache.parallelRoutes.set(parallelRouteKey, childSegmentMap);
    }
    const existingChildCacheNode = existingChildSegmentMap == null ? void 0 : existingChildSegmentMap.get(cacheKey);
    let childCacheNode = childSegmentMap.get(cacheKey);
    // In case of last segment start off the fetch at this level and don't copy further down.
    if (isLastEntry) {
        if (!childCacheNode || !childCacheNode.lazyData || childCacheNode === existingChildCacheNode) {
            childSegmentMap.set(cacheKey, {
                lazyData: null,
                rsc: null,
                prefetchRsc: null,
                head: [
                    null,
                    null
                ],
                prefetchHead: null,
                parallelRoutes: new Map(),
                loading: null
            });
        }
        return;
    }
    if (!childCacheNode || !existingChildCacheNode) {
        // Start fetch in the place where the existing cache doesn't have the data yet.
        if (!childCacheNode) {
            childSegmentMap.set(cacheKey, {
                lazyData: null,
                rsc: null,
                prefetchRsc: null,
                head: [
                    null,
                    null
                ],
                prefetchHead: null,
                parallelRoutes: new Map(),
                loading: null
            });
        }
        return;
    }
    if (childCacheNode === existingChildCacheNode) {
        childCacheNode = {
            lazyData: childCacheNode.lazyData,
            rsc: childCacheNode.rsc,
            prefetchRsc: childCacheNode.prefetchRsc,
            head: childCacheNode.head,
            prefetchHead: childCacheNode.prefetchHead,
            parallelRoutes: new Map(childCacheNode.parallelRoutes),
            loading: childCacheNode.loading
        };
        childSegmentMap.set(cacheKey, childCacheNode);
    }
    return clearCacheNodeDataForSegmentPath(childCacheNode, existingChildCacheNode, getNextFlightSegmentPath(flightSegmentPath));
}

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