import { searchParamsToUrlQuery } from '../shared/lib/router/utils/querystring';
import { formatWithValidation } from '../shared/lib/router/utils/format-url';
import { omit } from '../shared/lib/router/utils/omit';
import { normalizeRepeatedSlashes } from '../shared/lib/utils';
import { normalizePathTrailingSlash } from './normalize-trailing-slash';
import { isLocalURL } from '../shared/lib/router/utils/is-local-url';
import { isDynamicRoute } from '../shared/lib/router/utils';
import { interpolateAs } from '../shared/lib/router/utils/interpolate-as';
import { getRouteRegex } from '../shared/lib/router/utils/route-regex';
import { getRouteMatcher } from '../shared/lib/router/utils/route-matcher';
export function resolveHref(router, href, resolveAs) {
    // we use a dummy base url for relative urls
    let base;
    let urlAsString = typeof href === 'string' ? href : formatWithValidation(href);
    // repeated slashes and backslashes in the URL are considered
    // invalid and will never match a Next.js page/file
    // https://www.rfc-editor.org/rfc/rfc3986.html#section-3.1
    const urlProtoMatch = urlAsString.match(/^[a-z][a-z0-9+.-]*:\/\//i);
    const urlAsStringNoProto = urlProtoMatch ? urlAsString.slice(urlProtoMatch[0].length) : urlAsString;
    const urlParts = urlAsStringNoProto.split('?', 1);
    if ((urlParts[0] || '').match(/(\/\/|\\)/)) {
        console.error("Invalid href '" + urlAsString + "' passed to next/router in page: '" + router.pathname + "'. Repeated forward-slashes (//) or backslashes \\ are not valid in the href.");
        const normalizedUrl = normalizeRepeatedSlashes(urlAsStringNoProto);
        urlAsString = (urlProtoMatch ? urlProtoMatch[0] : '') + normalizedUrl;
    }
    // Return because it cannot be routed by the Next.js router
    if (!isLocalURL(urlAsString)) {
        return resolveAs ? [
            urlAsString
        ] : urlAsString;
    }
    try {
        let baseBase = urlAsString.startsWith('#') ? router.asPath : router.pathname;
        // If the provided href is only a query string, it is safer to use the asPath
        // considering rewrites.
        if (urlAsString.startsWith('?')) {
            baseBase = router.asPath;
            // However, if is a dynamic route, we need to use the pathname to preserve the
            // query interpolation and rewrites (router.pathname will look like "/[slug]").
            if (isDynamicRoute(router.pathname)) {
                baseBase = router.pathname;
                const routeRegex = getRouteRegex(router.pathname);
                const match = getRouteMatcher(routeRegex)(router.asPath);
                // For dynamic routes, if asPath doesn't match the pathname regex, it is a rewritten path.
                // In this case, should use asPath to preserve the current URL.
                if (!match) {
                    baseBase = router.asPath;
                }
            // Note: There is an edge case where the pathname is dynamic, and also a rewrite path to the same segment.
            // E.g. in "/[slug]" path, rewrite "/foo" -> "/bar"
            // In this case, it will be treated as a non-rewritten path and possibly interpolate the query string.
            // E.g., "/any?slug=foo" will become the content of "/foo", not rewritten as "/bar"
            // This is currently a trade-off of not resolving rewrite paths on every Router/Link call,
            // but using a lighter route regex pattern check.
            }
        }
        base = new URL(baseBase, 'http://n');
    } catch (_) {
        // fallback to / for invalid asPath values e.g. //
        base = new URL('/', 'http://n');
    }
    try {
        const finalUrl = new URL(urlAsString, base);
        finalUrl.pathname = normalizePathTrailingSlash(finalUrl.pathname);
        let interpolatedAs = '';
        if (isDynamicRoute(finalUrl.pathname) && finalUrl.searchParams && resolveAs) {
            const query = searchParamsToUrlQuery(finalUrl.searchParams);
            const { result, params } = interpolateAs(finalUrl.pathname, finalUrl.pathname, query);
            if (result) {
                interpolatedAs = formatWithValidation({
                    pathname: result,
                    hash: finalUrl.hash,
                    query: omit(query, params)
                });
            }
        }
        // if the origin didn't change, it means we received a relative href
        const resolvedHref = finalUrl.origin === base.origin ? finalUrl.href.slice(finalUrl.origin.length) : finalUrl.href;
        return resolveAs ? [
            resolvedHref,
            interpolatedAs || resolvedHref
        ] : resolvedHref;
    } catch (_) {
        return resolveAs ? [
            urlAsString
        ] : urlAsString;
    }
}

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