import { fetchServerResponse } from '../fetch-server-response';
import { createHrefFromUrl } from '../create-href-from-url';
import { applyRouterStatePatchToTree } from '../apply-router-state-patch-to-tree';
import { isNavigatingToNewRootLayout } from '../is-navigating-to-new-root-layout';
import { handleExternalUrl } from './navigate-reducer';
import { handleMutable } from '../handle-mutable';
import { applyFlightData } from '../apply-flight-data';
import { createEmptyCacheNode } from '../../app-router';
import { handleSegmentMismatch } from '../handle-segment-mismatch';
import { hasInterceptionRouteInCurrentTree } from './has-interception-route-in-current-tree';
// A version of refresh reducer that keeps the cache around instead of wiping all of it.
function hmrRefreshReducerImpl(state, action) {
    const { origin } = action;
    const mutable = {};
    const href = state.canonicalUrl;
    mutable.preserveCustomHistoryState = false;
    const cache = createEmptyCacheNode();
    // If the current tree was intercepted, the nextUrl should be included in the request.
    // This is to ensure that the refresh request doesn't get intercepted, accidentally triggering the interception route.
    const includeNextUrl = hasInterceptionRouteInCurrentTree(state.tree);
    // TODO-APP: verify that `href` is not an external url.
    // Fetch data from the root of the tree.
    cache.lazyData = fetchServerResponse(new URL(href, origin), {
        flightRouterState: [
            state.tree[0],
            state.tree[1],
            state.tree[2],
            'refetch'
        ],
        nextUrl: includeNextUrl ? state.nextUrl : null,
        buildId: state.buildId,
        isHmrRefresh: true
    });
    return cache.lazyData.then((param)=>{
        let { flightData, canonicalUrl: canonicalUrlOverride } = param;
        // Handle case when navigating to page in `pages` from `app`
        if (typeof flightData === 'string') {
            return handleExternalUrl(state, mutable, flightData, state.pushRef.pendingPush);
        }
        // Remove cache.lazyData as it has been resolved at this point.
        cache.lazyData = null;
        let currentTree = state.tree;
        let currentCache = state.cache;
        for (const flightDataPath of flightData){
            // FlightDataPath with more than two items means unexpected Flight data was returned
            if (flightDataPath.length !== 3) {
                // TODO-APP: handle this case better
                console.log('REFRESH FAILED');
                return state;
            }
            // Given the path can only have two items the items are only the router state and rsc for the root.
            const [treePatch] = flightDataPath;
            const newTree = applyRouterStatePatchToTree(// TODO-APP: remove ''
            [
                ''
            ], currentTree, treePatch, state.canonicalUrl);
            if (newTree === null) {
                return handleSegmentMismatch(state, action, treePatch);
            }
            if (isNavigatingToNewRootLayout(currentTree, newTree)) {
                return handleExternalUrl(state, mutable, href, state.pushRef.pendingPush);
            }
            const canonicalUrlOverrideHref = canonicalUrlOverride ? createHrefFromUrl(canonicalUrlOverride) : undefined;
            if (canonicalUrlOverride) {
                mutable.canonicalUrl = canonicalUrlOverrideHref;
            }
            const applied = applyFlightData(currentCache, cache, flightDataPath);
            if (applied) {
                mutable.cache = cache;
                currentCache = cache;
            }
            mutable.patchedTree = newTree;
            mutable.canonicalUrl = href;
            currentTree = newTree;
        }
        return handleMutable(state, mutable);
    }, ()=>state);
}
function hmrRefreshReducerNoop(state, _action) {
    return state;
}
export const hmrRefreshReducer = process.env.NODE_ENV === 'production' ? hmrRefreshReducerNoop : hmrRefreshReducerImpl;

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