import path from "path";
import fs from "fs/promises";
import * as Log from "../../../build/output/log";
import setupDebug from "next/dist/compiled/debug";
import LRUCache from "next/dist/compiled/lru-cache";
import loadCustomRoutes from "../../../lib/load-custom-routes";
import { modifyRouteRegex } from "../../../lib/redirect-status";
import { FileType, fileExists } from "../../../lib/file-exists";
import { recursiveReadDir } from "../../../lib/recursive-readdir";
import { isDynamicRoute } from "../../../shared/lib/router/utils";
import { escapeStringRegexp } from "../../../shared/lib/escape-regexp";
import { getPathMatch } from "../../../shared/lib/router/utils/path-match";
import { getRouteRegex } from "../../../shared/lib/router/utils/route-regex";
import { getRouteMatcher } from "../../../shared/lib/router/utils/route-matcher";
import { pathHasPrefix } from "../../../shared/lib/router/utils/path-has-prefix";
import { normalizeLocalePath } from "../../../shared/lib/i18n/normalize-locale-path";
import { removePathPrefix } from "../../../shared/lib/router/utils/remove-path-prefix";
import { getMiddlewareRouteMatcher } from "../../../shared/lib/router/utils/middleware-route-matcher";
import { APP_PATH_ROUTES_MANIFEST, BUILD_ID_FILE, MIDDLEWARE_MANIFEST, PAGES_MANIFEST, PRERENDER_MANIFEST, ROUTES_MANIFEST } from "../../../shared/lib/constants";
import { normalizePathSep } from "../../../shared/lib/page-path/normalize-path-sep";
import { normalizeMetadataRoute } from "../../../lib/metadata/get-metadata-route";
import { RSCPathnameNormalizer } from "../../future/normalizers/request/rsc";
import { PostponedPathnameNormalizer } from "../../future/normalizers/request/postponed";
import { PrefetchRSCPathnameNormalizer } from "../../future/normalizers/request/prefetch-rsc";
const debug = setupDebug("next:router-server:filesystem");
export const buildCustomRoute = (type, item, basePath, caseSensitive)=>{
    const restrictedRedirectPaths = [
        "/_next"
    ].map((p)=>basePath ? `${basePath}${p}` : p);
    const match = getPathMatch(item.source, {
        strict: true,
        removeUnnamedParams: true,
        regexModifier: !item.internal ? (regex)=>modifyRouteRegex(regex, type === "redirect" ? restrictedRedirectPaths : undefined) : undefined,
        sensitive: caseSensitive
    });
    return {
        ...item,
        ...type === "rewrite" ? {
            check: true
        } : {},
        match
    };
};
export async function setupFsCheck(opts) {
    const getItemsLru = !opts.dev ? new LRUCache({
        max: 1024 * 1024,
        length (value, key) {
            if (!value) return (key == null ? void 0 : key.length) || 0;
            return (key || "").length + (value.fsPath || "").length + value.itemPath.length + value.type.length;
        }
    }) : undefined;
    // routes that have _next/data endpoints (SSG/SSP)
    const nextDataRoutes = new Set();
    const publicFolderItems = new Set();
    const nextStaticFolderItems = new Set();
    const legacyStaticFolderItems = new Set();
    const appFiles = new Set();
    const pageFiles = new Set();
    let dynamicRoutes = [];
    let middlewareMatcher = ()=>false;
    const distDir = path.join(opts.dir, opts.config.distDir);
    const publicFolderPath = path.join(opts.dir, "public");
    const nextStaticFolderPath = path.join(distDir, "static");
    const legacyStaticFolderPath = path.join(opts.dir, "static");
    let customRoutes = {
        redirects: [],
        rewrites: {
            beforeFiles: [],
            afterFiles: [],
            fallback: []
        },
        headers: []
    };
    let buildId = "development";
    let prerenderManifest;
    if (!opts.dev) {
        var _middlewareManifest_middleware_, _middlewareManifest_middleware;
        const buildIdPath = path.join(opts.dir, opts.config.distDir, BUILD_ID_FILE);
        buildId = await fs.readFile(buildIdPath, "utf8");
        try {
            for (const file of (await recursiveReadDir(publicFolderPath))){
                // Ensure filename is encoded and normalized.
                publicFolderItems.add(encodeURI(normalizePathSep(file)));
            }
        } catch (err) {
            if (err.code !== "ENOENT") {
                throw err;
            }
        }
        try {
            for (const file of (await recursiveReadDir(legacyStaticFolderPath))){
                // Ensure filename is encoded and normalized.
                legacyStaticFolderItems.add(encodeURI(normalizePathSep(file)));
            }
            Log.warn(`The static directory has been deprecated in favor of the public directory. https://nextjs.org/docs/messages/static-dir-deprecated`);
        } catch (err) {
            if (err.code !== "ENOENT") {
                throw err;
            }
        }
        try {
            for (const file of (await recursiveReadDir(nextStaticFolderPath))){
                // Ensure filename is encoded and normalized.
                nextStaticFolderItems.add(path.posix.join("/_next/static", encodeURI(normalizePathSep(file))));
            }
        } catch (err) {
            if (opts.config.output !== "standalone") throw err;
        }
        const routesManifestPath = path.join(distDir, ROUTES_MANIFEST);
        const prerenderManifestPath = path.join(distDir, PRERENDER_MANIFEST);
        const middlewareManifestPath = path.join(distDir, "server", MIDDLEWARE_MANIFEST);
        const pagesManifestPath = path.join(distDir, "server", PAGES_MANIFEST);
        const appRoutesManifestPath = path.join(distDir, APP_PATH_ROUTES_MANIFEST);
        const routesManifest = JSON.parse(await fs.readFile(routesManifestPath, "utf8"));
        prerenderManifest = JSON.parse(await fs.readFile(prerenderManifestPath, "utf8"));
        const middlewareManifest = JSON.parse(await fs.readFile(middlewareManifestPath, "utf8").catch(()=>"{}"));
        const pagesManifest = JSON.parse(await fs.readFile(pagesManifestPath, "utf8"));
        const appRoutesManifest = JSON.parse(await fs.readFile(appRoutesManifestPath, "utf8").catch(()=>"{}"));
        for (const key of Object.keys(pagesManifest)){
            // ensure the non-locale version is in the set
            if (opts.config.i18n) {
                pageFiles.add(normalizeLocalePath(key, opts.config.i18n.locales).pathname);
            } else {
                pageFiles.add(key);
            }
        }
        for (const key of Object.keys(appRoutesManifest)){
            appFiles.add(appRoutesManifest[key]);
        }
        const escapedBuildId = escapeStringRegexp(buildId);
        for (const route of routesManifest.dataRoutes){
            if (isDynamicRoute(route.page)) {
                const routeRegex = getRouteRegex(route.page);
                dynamicRoutes.push({
                    ...route,
                    regex: routeRegex.re.toString(),
                    match: getRouteMatcher({
                        // TODO: fix this in the manifest itself, must also be fixed in
                        // upstream builder that relies on this
                        re: opts.config.i18n ? new RegExp(route.dataRouteRegex.replace(`/${escapedBuildId}/`, `/${escapedBuildId}/(?<nextLocale>[^/]+?)/`)) : new RegExp(route.dataRouteRegex),
                        groups: routeRegex.groups
                    })
                });
            }
            nextDataRoutes.add(route.page);
        }
        for (const route of routesManifest.dynamicRoutes){
            dynamicRoutes.push({
                ...route,
                match: getRouteMatcher(getRouteRegex(route.page))
            });
        }
        if ((_middlewareManifest_middleware = middlewareManifest.middleware) == null ? void 0 : (_middlewareManifest_middleware_ = _middlewareManifest_middleware["/"]) == null ? void 0 : _middlewareManifest_middleware_.matchers) {
            var _middlewareManifest_middleware_1, _middlewareManifest_middleware1;
            middlewareMatcher = getMiddlewareRouteMatcher((_middlewareManifest_middleware1 = middlewareManifest.middleware) == null ? void 0 : (_middlewareManifest_middleware_1 = _middlewareManifest_middleware1["/"]) == null ? void 0 : _middlewareManifest_middleware_1.matchers);
        }
        customRoutes = {
            redirects: routesManifest.redirects,
            rewrites: routesManifest.rewrites ? Array.isArray(routesManifest.rewrites) ? {
                beforeFiles: [],
                afterFiles: routesManifest.rewrites,
                fallback: []
            } : routesManifest.rewrites : {
                beforeFiles: [],
                afterFiles: [],
                fallback: []
            },
            headers: routesManifest.headers
        };
    } else {
        // dev handling
        customRoutes = await loadCustomRoutes(opts.config);
        prerenderManifest = {
            version: 4,
            routes: {},
            dynamicRoutes: {},
            notFoundRoutes: [],
            preview: {
                previewModeId: require("crypto").randomBytes(16).toString("hex"),
                previewModeSigningKey: require("crypto").randomBytes(32).toString("hex"),
                previewModeEncryptionKey: require("crypto").randomBytes(32).toString("hex")
            }
        };
    }
    const headers = customRoutes.headers.map((item)=>buildCustomRoute("header", item, opts.config.basePath, opts.config.experimental.caseSensitiveRoutes));
    const redirects = customRoutes.redirects.map((item)=>buildCustomRoute("redirect", item, opts.config.basePath, opts.config.experimental.caseSensitiveRoutes));
    const rewrites = {
        // TODO: add interception routes generateInterceptionRoutesRewrites()
        beforeFiles: customRoutes.rewrites.beforeFiles.map((item)=>buildCustomRoute("before_files_rewrite", item)),
        afterFiles: customRoutes.rewrites.afterFiles.map((item)=>buildCustomRoute("rewrite", item, opts.config.basePath, opts.config.experimental.caseSensitiveRoutes)),
        fallback: customRoutes.rewrites.fallback.map((item)=>buildCustomRoute("rewrite", item, opts.config.basePath, opts.config.experimental.caseSensitiveRoutes))
    };
    const { i18n } = opts.config;
    const handleLocale = (pathname, locales)=>{
        let locale;
        if (i18n) {
            const i18nResult = normalizeLocalePath(pathname, locales || i18n.locales);
            pathname = i18nResult.pathname;
            locale = i18nResult.detectedLocale;
        }
        return {
            locale,
            pathname
        };
    };
    debug("nextDataRoutes", nextDataRoutes);
    debug("dynamicRoutes", dynamicRoutes);
    debug("pageFiles", pageFiles);
    debug("appFiles", appFiles);
    let ensureFn;
    const normalizers = {
        // Because we can't know if the app directory is enabled or not at this
        // stage, we assume that it is.
        rsc: new RSCPathnameNormalizer(true),
        prefetchRSC: new PrefetchRSCPathnameNormalizer(true),
        postponed: new PostponedPathnameNormalizer(opts.config.experimental.ppr)
    };
    return {
        headers,
        rewrites,
        redirects,
        buildId,
        handleLocale,
        appFiles,
        pageFiles,
        dynamicRoutes,
        nextDataRoutes,
        interceptionRoutes: undefined,
        devVirtualFsItems: new Set(),
        prerenderManifest,
        middlewareMatcher: middlewareMatcher,
        ensureCallback (fn) {
            ensureFn = fn;
        },
        async getItem (itemPath) {
            const originalItemPath = itemPath;
            const itemKey = originalItemPath;
            const lruResult = getItemsLru == null ? void 0 : getItemsLru.get(itemKey);
            if (lruResult) {
                return lruResult;
            }
            const { basePath } = opts.config;
            if (basePath && !pathHasPrefix(itemPath, basePath)) {
                return null;
            }
            itemPath = removePathPrefix(itemPath, basePath) || "/";
            // Simulate minimal mode requests by normalizing RSC and postponed
            // requests.
            if (opts.minimalMode) {
                if (normalizers.prefetchRSC.match(itemPath)) {
                    itemPath = normalizers.prefetchRSC.normalize(itemPath, true);
                } else if (normalizers.rsc.match(itemPath)) {
                    itemPath = normalizers.rsc.normalize(itemPath, true);
                } else if (normalizers.postponed.match(itemPath)) {
                    itemPath = normalizers.postponed.normalize(itemPath, true);
                }
            }
            if (itemPath !== "/" && itemPath.endsWith("/")) {
                itemPath = itemPath.substring(0, itemPath.length - 1);
            }
            let decodedItemPath = itemPath;
            try {
                decodedItemPath = decodeURIComponent(itemPath);
            } catch  {}
            if (itemPath === "/_next/image") {
                return {
                    itemPath,
                    type: "nextImage"
                };
            }
            const itemsToCheck = [
                [
                    this.devVirtualFsItems,
                    "devVirtualFsItem"
                ],
                [
                    nextStaticFolderItems,
                    "nextStaticFolder"
                ],
                [
                    legacyStaticFolderItems,
                    "legacyStaticFolder"
                ],
                [
                    publicFolderItems,
                    "publicFolder"
                ],
                [
                    appFiles,
                    "appFile"
                ],
                [
                    pageFiles,
                    "pageFile"
                ]
            ];
            for (let [items, type] of itemsToCheck){
                let locale;
                let curItemPath = itemPath;
                let curDecodedItemPath = decodedItemPath;
                const isDynamicOutput = type === "pageFile" || type === "appFile";
                if (i18n) {
                    const localeResult = handleLocale(itemPath, // legacy behavior allows visiting static assets under
                    // default locale but no other locale
                    isDynamicOutput ? undefined : [
                        i18n == null ? void 0 : i18n.defaultLocale
                    ]);
                    if (localeResult.pathname !== curItemPath) {
                        curItemPath = localeResult.pathname;
                        locale = localeResult.locale;
                        try {
                            curDecodedItemPath = decodeURIComponent(curItemPath);
                        } catch  {}
                    }
                }
                if (type === "legacyStaticFolder") {
                    if (!pathHasPrefix(curItemPath, "/static")) {
                        continue;
                    }
                    curItemPath = curItemPath.substring("/static".length);
                    try {
                        curDecodedItemPath = decodeURIComponent(curItemPath);
                    } catch  {}
                }
                if (type === "nextStaticFolder" && !pathHasPrefix(curItemPath, "/_next/static")) {
                    continue;
                }
                const nextDataPrefix = `/_next/data/${buildId}/`;
                if (type === "pageFile" && curItemPath.startsWith(nextDataPrefix) && curItemPath.endsWith(".json")) {
                    items = nextDataRoutes;
                    // remove _next/data/<build-id> prefix
                    curItemPath = curItemPath.substring(nextDataPrefix.length - 1);
                    // remove .json postfix
                    curItemPath = curItemPath.substring(0, curItemPath.length - ".json".length);
                    const curLocaleResult = handleLocale(curItemPath);
                    curItemPath = curLocaleResult.pathname === "/index" ? "/" : curLocaleResult.pathname;
                    locale = curLocaleResult.locale;
                    try {
                        curDecodedItemPath = decodeURIComponent(curItemPath);
                    } catch  {}
                }
                let matchedItem = items.has(curItemPath);
                // check decoded variant as well
                if (!matchedItem && !opts.dev) {
                    matchedItem = items.has(curItemPath);
                    if (matchedItem) curItemPath = curDecodedItemPath;
                    else {
                        // x-ref: https://github.com/vercel/next.js/issues/54008
                        // There're cases that urls get decoded before requests, we should support both encoded and decoded ones.
                        // e.g. nginx could decode the proxy urls, the below ones should be treated as the same:
                        // decoded version: `/_next/static/chunks/pages/blog/[slug]-d4858831b91b69f6.js`
                        // encoded version: `/_next/static/chunks/pages/blog/%5Bslug%5D-d4858831b91b69f6.js`
                        try {
                            // encode the special characters in the path and retrieve again to determine if path exists.
                            const encodedCurItemPath = encodeURI(curItemPath);
                            matchedItem = items.has(encodedCurItemPath);
                        } catch  {}
                    }
                }
                if (matchedItem || opts.dev) {
                    let fsPath;
                    let itemsRoot;
                    switch(type){
                        case "nextStaticFolder":
                            {
                                itemsRoot = nextStaticFolderPath;
                                curItemPath = curItemPath.substring("/_next/static".length);
                                break;
                            }
                        case "legacyStaticFolder":
                            {
                                itemsRoot = legacyStaticFolderPath;
                                break;
                            }
                        case "publicFolder":
                            {
                                itemsRoot = publicFolderPath;
                                break;
                            }
                        default:
                            {
                                break;
                            }
                    }
                    if (itemsRoot && curItemPath) {
                        fsPath = path.posix.join(itemsRoot, curItemPath);
                    }
                    // dynamically check fs in development so we don't
                    // have to wait on the watcher
                    if (!matchedItem && opts.dev) {
                        const isStaticAsset = [
                            "nextStaticFolder",
                            "publicFolder",
                            "legacyStaticFolder"
                        ].includes(type);
                        if (isStaticAsset && itemsRoot) {
                            let found = fsPath && await fileExists(fsPath, FileType.File);
                            if (!found) {
                                try {
                                    // In dev, we ensure encoded paths match
                                    // decoded paths on the filesystem so check
                                    // that variation as well
                                    const tempItemPath = decodeURIComponent(curItemPath);
                                    fsPath = path.posix.join(itemsRoot, tempItemPath);
                                    found = await fileExists(fsPath, FileType.File);
                                } catch  {}
                                if (!found) {
                                    continue;
                                }
                            }
                        } else if (type === "pageFile" || type === "appFile") {
                            var _ensureFn;
                            const isAppFile = type === "appFile";
                            if (ensureFn && await ((_ensureFn = ensureFn({
                                type,
                                itemPath: isAppFile ? normalizeMetadataRoute(curItemPath) : curItemPath
                            })) == null ? void 0 : _ensureFn.catch(()=>"ENSURE_FAILED")) === "ENSURE_FAILED") {
                                continue;
                            }
                        } else {
                            continue;
                        }
                    }
                    // i18n locales aren't matched for app dir
                    if (type === "appFile" && locale && locale !== (i18n == null ? void 0 : i18n.defaultLocale)) {
                        continue;
                    }
                    const itemResult = {
                        type,
                        fsPath,
                        locale,
                        itemsRoot,
                        itemPath: curItemPath
                    };
                    getItemsLru == null ? void 0 : getItemsLru.set(itemKey, itemResult);
                    return itemResult;
                }
            }
            getItemsLru == null ? void 0 : getItemsLru.set(itemKey, null);
            return null;
        },
        getDynamicRoutes () {
            // this should include data routes
            return this.dynamicRoutes;
        },
        getMiddlewareMatchers () {
            return this.middlewareMatcher;
        }
    };
}

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