import { createHrefFromUrl } from '../create-href-from-url';
import { handleMutable } from '../handle-mutable';
import { navigate as navigateUsingSegmentCache, NavigationResultTag } from '../../segment-cache';
// These values are set by `define-env-plugin` (based on `nextConfig.experimental.staleTimes`)
// and default to 5 minutes (static) / 0 seconds (dynamic)
export const DYNAMIC_STALETIME_MS = Number(process.env.__NEXT_CLIENT_ROUTER_DYNAMIC_STALETIME) * 1000;
export const STATIC_STALETIME_MS = Number(process.env.__NEXT_CLIENT_ROUTER_STATIC_STALETIME) * 1000;
export function handleExternalUrl(state, mutable, url, pendingPush) {
    mutable.mpaNavigation = true;
    mutable.canonicalUrl = url;
    mutable.pendingPush = pendingPush;
    mutable.scrollableSegments = undefined;
    return handleMutable(state, mutable);
}
export function generateSegmentsFromPatch(flightRouterPatch) {
    const segments = [];
    const [segment, parallelRoutes] = flightRouterPatch;
    if (Object.keys(parallelRoutes).length === 0) {
        return [
            [
                segment
            ]
        ];
    }
    for (const [parallelRouteKey, parallelRoute] of Object.entries(parallelRoutes)){
        for (const childSegment of generateSegmentsFromPatch(parallelRoute)){
            // If the segment is empty, it means we are at the root of the tree
            if (segment === '') {
                segments.push([
                    parallelRouteKey,
                    ...childSegment
                ]);
            } else {
                segments.push([
                    segment,
                    parallelRouteKey,
                    ...childSegment
                ]);
            }
        }
    }
    return segments;
}
function handleNavigationResult(url, state, mutable, pendingPush, result) {
    switch(result.tag){
        case NavigationResultTag.MPA:
            {
                // Perform an MPA navigation.
                const newUrl = result.data;
                return handleExternalUrl(state, mutable, newUrl, pendingPush);
            }
        case NavigationResultTag.NoOp:
            {
                // The server responded with no change to the current page. However, if
                // the URL changed, we still need to update that.
                const newCanonicalUrl = result.data.canonicalUrl;
                mutable.canonicalUrl = newCanonicalUrl;
                // Check if the only thing that changed was the hash fragment.
                const oldUrl = new URL(state.canonicalUrl, url);
                const onlyHashChange = // We don't need to compare the origins, because client-driven
                // navigations are always same-origin.
                url.pathname === oldUrl.pathname && url.search === oldUrl.search && url.hash !== oldUrl.hash;
                if (onlyHashChange) {
                    // The only updated part of the URL is the hash.
                    mutable.onlyHashChange = true;
                    mutable.shouldScroll = result.data.shouldScroll;
                    mutable.hashFragment = url.hash;
                    // Setting this to an empty array triggers a scroll for all new and
                    // updated segments. See `ScrollAndFocusHandler` for more details.
                    mutable.scrollableSegments = [];
                }
                return handleMutable(state, mutable);
            }
        case NavigationResultTag.Success:
            {
                // Received a new result.
                mutable.cache = result.data.cacheNode;
                mutable.patchedTree = result.data.flightRouterState;
                mutable.renderedSearch = result.data.renderedSearch;
                mutable.canonicalUrl = result.data.canonicalUrl;
                mutable.scrollableSegments = result.data.scrollableSegments;
                mutable.shouldScroll = result.data.shouldScroll;
                mutable.hashFragment = result.data.hash;
                return handleMutable(state, mutable);
            }
        case NavigationResultTag.Async:
            {
                return result.data.then((asyncResult)=>handleNavigationResult(url, state, mutable, pendingPush, asyncResult), // If the navigation failed, return the current state.
                // TODO: This matches the current behavior but we need to do something
                // better here if the network fails.
                ()=>{
                    return state;
                });
            }
        default:
            {
                result;
                return state;
            }
    }
}
export function navigateReducer(state, action) {
    const { url, isExternalUrl, navigateType, shouldScroll } = action;
    const mutable = {};
    const href = createHrefFromUrl(url);
    const pendingPush = navigateType === 'push';
    mutable.preserveCustomHistoryState = false;
    mutable.pendingPush = pendingPush;
    if (isExternalUrl) {
        return handleExternalUrl(state, mutable, url.toString(), pendingPush);
    }
    // Handles case where `<meta http-equiv="refresh">` tag is present,
    // which will trigger an MPA navigation.
    if (document.getElementById('__next-page-redirect')) {
        return handleExternalUrl(state, mutable, href, pendingPush);
    }
    // Temporary glue code between the router reducer and the new navigation
    // implementation. Eventually we'll rewrite the router reducer to a
    // state machine.
    const currentUrl = new URL(state.canonicalUrl, location.origin);
    const result = navigateUsingSegmentCache(url, currentUrl, state.cache, state.tree, state.nextUrl, shouldScroll, mutable);
    return handleNavigationResult(url, state, mutable, pendingPush, result);
}

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