import path from "path";
import { stringify } from "querystring";
import chalk from "next/dist/compiled/chalk";
import { getModuleBuildInfo } from "./get-module-build-info";
import { verifyRootLayout } from "../../../lib/verifyRootLayout";
import * as Log from "../../output/log";
import { APP_DIR_ALIAS, WEBPACK_RESOURCE_QUERIES } from "../../../lib/constants";
import { createMetadataExportsCode, createStaticMetadataFromRoute } from "./metadata/discover";
import { promises as fs } from "fs";
import { isAppRouteRoute } from "../../../lib/is-app-route-route";
import { isMetadataRoute } from "../../../lib/metadata/is-metadata-route";
import { AppPathnameNormalizer } from "../../../server/future/normalizers/built/app/app-pathname-normalizer";
import { RouteKind } from "../../../server/future/route-kind";
import { AppBundlePathNormalizer } from "../../../server/future/normalizers/built/app/app-bundle-path-normalizer";
import { FileType, fileExists } from "../../../lib/file-exists";
const FILE_TYPES = {
    layout: "layout",
    template: "template",
    error: "error",
    loading: "loading",
    "not-found": "not-found"
};
const GLOBAL_ERROR_FILE_TYPE = "global-error";
const PAGE_SEGMENT = "page$";
const PARALLEL_CHILDREN_SEGMENT = "children$";
async function createAppRouteCode({ name , page , pagePath , resolveAppRoute , pageExtensions , nextConfigOutput  }) {
    // routePath is the path to the route handler file,
    // but could be aliased e.g. private-next-app-dir/favicon.ico
    const routePath = pagePath.replace(/[\\/]/, "/");
    // This, when used with the resolver will give us the pathname to the built
    // route handler file.
    let resolvedPagePath = await resolveAppRoute(routePath);
    if (!resolvedPagePath) {
        throw new Error(`Invariant: could not resolve page path for ${name} at ${routePath}`);
    }
    // If this is a metadata route, then we need to use the metadata loader for
    // the route to ensure that the route is generated.
    const filename = path.parse(resolvedPagePath).name;
    if (isMetadataRoute(name) && filename !== "route") {
        resolvedPagePath = `next-metadata-route-loader?${stringify({
            page,
            pageExtensions
        })}!${resolvedPagePath + "?" + WEBPACK_RESOURCE_QUERIES.metadata}`;
    }
    // References the route handler file to load found in `./routes/${kind}.ts`.
    // TODO: allow switching to the different kinds of routes
    const kind = "app-route";
    const pathname = new AppPathnameNormalizer().normalize(page);
    const bundlePath = new AppBundlePathNormalizer().normalize(page);
    // This is providing the options defined by the route options type found at
    // ./routes/${kind}.ts. This is stringified here so that the literal for
    // `userland` can reference the variable for `userland` that's in scope for
    // the loader code.
    const options = {
        definition: {
            kind: RouteKind.APP_ROUTE,
            page,
            pathname,
            filename,
            bundlePath
        },
        resolvedPagePath,
        nextConfigOutput
    };
    return `
    import 'next/dist/server/node-polyfill-headers'

    import RouteModule from 'next/dist/server/future/route-modules/${kind}/module'

    import * as userland from ${JSON.stringify(resolvedPagePath)}

    const options = ${JSON.stringify(options)}
    const routeModule = new RouteModule({
      ...options,
      userland,
    })

    // Pull out the exports that we need to expose from the module. This should
    // be eliminated when we've moved the other routes to the new format. These
    // are used to hook into the route.
    const {
      requestAsyncStorage,
      staticGenerationAsyncStorage,
      serverHooks,
      headerHooks,
      staticGenerationBailout
    } = routeModule

    const originalPathname = "${page}"

    export {
      routeModule,
      requestAsyncStorage,
      staticGenerationAsyncStorage,
      serverHooks,
      headerHooks,
      staticGenerationBailout,
      originalPathname
    }`;
}
const normalizeParallelKey = (key)=>key.startsWith("@") ? key.slice(1) : key;
const isDirectory = async (pathname)=>{
    try {
        const stat = await fs.stat(pathname);
        return stat.isDirectory();
    } catch (err) {
        return false;
    }
};
async function createTreeCodeFromPath(pagePath, { resolveDir , resolver , resolveParallelSegments , metadataResolver , pageExtensions , basePath  }) {
    const splittedPath = pagePath.split(/[\\/]/);
    const appDirPrefix = splittedPath[0];
    const pages = [];
    let rootLayout;
    let globalError;
    async function resolveAdjacentParallelSegments(segmentPath) {
        const absoluteSegmentPath = await resolveDir(`${appDirPrefix}${segmentPath}`);
        if (!absoluteSegmentPath) {
            return [];
        }
        const segmentIsDirectory = await isDirectory(absoluteSegmentPath);
        if (!segmentIsDirectory) {
            return [];
        }
        // We need to resolve all parallel routes in this level.
        const files = await fs.readdir(absoluteSegmentPath);
        const parallelSegments = [
            "children"
        ];
        await Promise.all(files.map(async (file)=>{
            const filePath = path.join(absoluteSegmentPath, file);
            const stat = await fs.stat(filePath);
            if (stat.isDirectory() && file.startsWith("@")) {
                parallelSegments.push(file);
            }
        }));
        return parallelSegments;
    }
    async function createSubtreePropsFromSegmentPath(segments) {
        const segmentPath = segments.join("/");
        // Existing tree are the children of the current segment
        const props = {};
        const isRootLayer = segments.length === 0;
        const isRootLayoutOrRootPage = segments.length <= 1;
        // We need to resolve all parallel routes in this level.
        const parallelSegments = [];
        if (isRootLayer) {
            parallelSegments.push([
                "children",
                ""
            ]);
        } else {
            parallelSegments.push(...resolveParallelSegments(segmentPath));
        }
        let metadata = null;
        const routerDirPath = `${appDirPrefix}${segmentPath}`;
        const resolvedRouteDir = await resolveDir(routerDirPath);
        if (resolvedRouteDir) {
            metadata = await createStaticMetadataFromRoute(resolvedRouteDir, {
                basePath,
                segment: segmentPath,
                metadataResolver,
                isRootLayoutOrRootPage,
                pageExtensions
            });
        }
        for (const [parallelKey, parallelSegment] of parallelSegments){
            if (parallelSegment === PAGE_SEGMENT) {
                const matchedPagePath = `${appDirPrefix}${segmentPath}${parallelKey === "children" ? "" : `/${parallelKey}`}/page`;
                const resolvedPagePath = await resolver(matchedPagePath);
                if (resolvedPagePath) pages.push(resolvedPagePath);
                // Use '' for segment as it's the page. There can't be a segment called '' so this is the safest way to add it.
                props[normalizeParallelKey(parallelKey)] = `['__PAGE__', {}, {
          page: [() => import(/* webpackMode: "eager" */ ${JSON.stringify(resolvedPagePath)}), ${JSON.stringify(resolvedPagePath)}],
          ${createMetadataExportsCode(metadata)}
        }]`;
                continue;
            }
            const subSegmentPath = [
                ...segments
            ];
            if (parallelKey !== "children") {
                subSegmentPath.push(parallelKey);
            }
            const normalizedParallelSegments = Array.isArray(parallelSegment) ? parallelSegment.slice(0, 1) : [
                parallelSegment
            ];
            subSegmentPath.push(...normalizedParallelSegments.filter((segment)=>segment !== PAGE_SEGMENT && segment !== PARALLEL_CHILDREN_SEGMENT));
            const { treeCode: subtreeCode  } = await createSubtreePropsFromSegmentPath(subSegmentPath);
            const parallelSegmentPath = subSegmentPath.join("/");
            // `page` is not included here as it's added above.
            const filePaths = await Promise.all(Object.values(FILE_TYPES).map(async (file)=>{
                return [
                    file,
                    await resolver(`${appDirPrefix}${// TODO-APP: parallelSegmentPath sometimes ends in `/` but sometimes it doesn't. This should be consistent.
                    parallelSegmentPath.endsWith("/") ? parallelSegmentPath : parallelSegmentPath + "/"}${file}`)
                ];
            }));
            const definedFilePaths = filePaths.filter(([, filePath])=>filePath !== undefined);
            if (!rootLayout) {
                var _definedFilePaths_find;
                const layoutPath = (_definedFilePaths_find = definedFilePaths.find(([type])=>type === "layout")) == null ? void 0 : _definedFilePaths_find[1];
                rootLayout = layoutPath;
                if (layoutPath) {
                    globalError = await resolver(`${path.dirname(layoutPath)}/${GLOBAL_ERROR_FILE_TYPE}`);
                }
            }
            let parallelSegmentKey = Array.isArray(parallelSegment) ? parallelSegment[0] : parallelSegment;
            parallelSegmentKey = parallelSegmentKey === PARALLEL_CHILDREN_SEGMENT ? "children" : parallelSegmentKey;
            props[normalizeParallelKey(parallelKey)] = `[
        '${parallelSegmentKey}',
        ${subtreeCode},
        {
          ${definedFilePaths.map(([file, filePath])=>{
                return `'${file}': [() => import(/* webpackMode: "eager" */ ${JSON.stringify(filePath)}), ${JSON.stringify(filePath)}],`;
            }).join("\n")}
          ${createMetadataExportsCode(metadata)}
        }
      ]`;
        }
        const adjacentParallelSegments = await resolveAdjacentParallelSegments(segmentPath);
        for (const adjacentParallelSegment of adjacentParallelSegments){
            if (!props[normalizeParallelKey(adjacentParallelSegment)]) {
                const actualSegment = adjacentParallelSegment === "children" ? "" : adjacentParallelSegment;
                const defaultPath = await resolver(`${appDirPrefix}${segmentPath}/${actualSegment}/default`) ?? "next/dist/client/components/parallel-route-default";
                props[normalizeParallelKey(adjacentParallelSegment)] = `[
          '__DEFAULT__',
          {},
          {
            defaultPage: [() => import(/* webpackMode: "eager" */ ${JSON.stringify(defaultPath)}), ${JSON.stringify(defaultPath)}],
          }
        ]`;
            }
        }
        return {
            treeCode: `{
        ${Object.entries(props).map(([key, value])=>`${key}: ${value}`).join(",\n")}
      }`
        };
    }
    const { treeCode  } = await createSubtreePropsFromSegmentPath([]);
    return {
        treeCode: `const tree = ${treeCode}.children;`,
        pages: `const pages = ${JSON.stringify(pages)};`,
        rootLayout,
        globalError
    };
}
function createAbsolutePath(appDir, pathToTurnAbsolute) {
    return pathToTurnAbsolute// Replace all POSIX path separators with the current OS path separator
    .replace(/\//g, path.sep).replace(/^private-next-app-dir/, appDir);
}
const nextAppLoader = async function nextAppLoader() {
    const loaderOptions = this.getOptions();
    const { name , appDir , appPaths , pagePath , pageExtensions , rootDir , tsconfigPath , isDev , nextConfigOutput , preferredRegion , basePath , middlewareConfig: middlewareConfigBase64  } = loaderOptions;
    const buildInfo = getModuleBuildInfo(this._module);
    const page = name.replace(/^app/, "");
    const middlewareConfig = JSON.parse(Buffer.from(middlewareConfigBase64, "base64").toString());
    buildInfo.route = {
        page,
        absolutePagePath: createAbsolutePath(appDir, pagePath),
        preferredRegion,
        middlewareConfig
    };
    const extensions = pageExtensions.map((extension)=>`.${extension}`);
    const normalizedAppPaths = typeof appPaths === "string" ? [
        appPaths
    ] : appPaths || [];
    const resolveParallelSegments = (pathname)=>{
        const matched = {};
        for (const appPath of normalizedAppPaths){
            if (appPath.startsWith(pathname + "/")) {
                const rest = appPath.slice(pathname.length + 1).split("/");
                // It is the actual page, mark it specially.
                if (rest.length === 1 && rest[0] === "page") {
                    matched.children = PAGE_SEGMENT;
                    continue;
                }
                const isParallelRoute = rest[0].startsWith("@");
                if (isParallelRoute && rest.length === 2 && rest[1] === "page") {
                    matched[rest[0]] = [
                        PAGE_SEGMENT
                    ];
                    continue;
                }
                if (isParallelRoute) {
                    // we insert a special marker in order to also process layout/etc files at the slot level
                    matched[rest[0]] = [
                        PARALLEL_CHILDREN_SEGMENT,
                        ...rest.slice(1)
                    ];
                    continue;
                }
                matched.children = rest[0];
            }
        }
        return Object.entries(matched);
    };
    const resolveDir = (pathToResolve)=>{
        return createAbsolutePath(appDir, pathToResolve);
    };
    const resolveAppRoute = (pathToResolve)=>{
        return createAbsolutePath(appDir, pathToResolve);
    };
    const resolver = async (pathname)=>{
        const absolutePath = createAbsolutePath(appDir, pathname);
        let result;
        for (const ext of extensions){
            const absolutePathWithExtension = `${absolutePath}${ext}`;
            if (!result && await fileExists(absolutePathWithExtension, FileType.File)) {
                result = absolutePathWithExtension;
            }
            // Call `addMissingDependency` for all files even if they didn't match,
            // because they might be added or removed during development.
            this.addMissingDependency(absolutePathWithExtension);
        }
        return result;
    };
    const metadataResolver = async (pathname, exts)=>{
        const absolutePath = createAbsolutePath(appDir, pathname);
        let result;
        for (const ext of exts){
            // Compared to `resolver` above the exts do not have the `.` included already, so it's added here.
            const absolutePathWithExtension = `${absolutePath}.${ext}`;
            if (!result && await fileExists(absolutePathWithExtension, FileType.File)) {
                result = absolutePathWithExtension;
            }
            // Call `addMissingDependency` for all files even if they didn't match,
            // because they might be added or removed during development.
            this.addMissingDependency(absolutePathWithExtension);
        }
        return result;
    };
    if (isAppRouteRoute(name)) {
        return createAppRouteCode({
            // TODO: investigate if the local `page` is the same as the loaderOptions.page
            page: loaderOptions.page,
            name,
            pagePath,
            resolveAppRoute,
            pageExtensions,
            nextConfigOutput
        });
    }
    let treeCodeResult = await createTreeCodeFromPath(pagePath, {
        resolveDir,
        resolver,
        metadataResolver,
        resolveParallelSegments,
        loaderContext: this,
        pageExtensions,
        basePath
    });
    if (!treeCodeResult.rootLayout) {
        if (!isDev) {
            // If we're building and missing a root layout, exit the build
            Log.error(`${chalk.bold(pagePath.replace(`${APP_DIR_ALIAS}/`, ""))} doesn't have a root layout. To fix this error, make sure every page has a root layout.`);
            process.exit(1);
        } else {
            // In dev we'll try to create a root layout
            const [createdRootLayout, rootLayoutPath] = await verifyRootLayout({
                appDir: appDir,
                dir: rootDir,
                tsconfigPath: tsconfigPath,
                pagePath,
                pageExtensions
            });
            if (!createdRootLayout) {
                let message = `${chalk.bold(pagePath.replace(`${APP_DIR_ALIAS}/`, ""))} doesn't have a root layout. `;
                if (rootLayoutPath) {
                    var _this__compiler;
                    message += `We tried to create ${chalk.bold(path.relative(((_this__compiler = this._compiler) == null ? void 0 : _this__compiler.context) ?? "", rootLayoutPath))} for you but something went wrong.`;
                } else {
                    message += "To fix this error, make sure every page has a root layout.";
                }
                throw new Error(message);
            }
            // Get the new result with the created root layout.
            treeCodeResult = await createTreeCodeFromPath(pagePath, {
                resolveDir,
                resolver,
                metadataResolver,
                resolveParallelSegments,
                loaderContext: this,
                pageExtensions,
                basePath
            });
        }
    }
    // Prefer to modify next/src/server/app-render/entry-base.ts since this is shared with Turbopack.
    // Any changes to this code should be reflected in Turbopack's app_source.rs and/or app-renderer.tsx as well.
    const result = `
    export ${treeCodeResult.treeCode}
    export ${treeCodeResult.pages}
    export { default as GlobalError } from ${JSON.stringify(treeCodeResult.globalError || "next/dist/client/components/error-boundary")}
    export const originalPathname = ${JSON.stringify(page)}
    export const __next_app__ = {
      require: __webpack_require__,
      // all modules are in the entry chunk, so we never actually need to load chunks in webpack
      loadChunk: () => Promise.resolve()
    }

    export * from 'next/dist/server/app-render/entry-base'
  `;
    return result;
};
export default nextAppLoader;

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