import fs from "fs";
import path from "path";
import { imageExtMimeTypeMap } from "../../../lib/mime-type";
const cacheHeader = {
    none: "no-cache, no-store",
    longCache: "public, immutable, no-transform, max-age=31536000",
    revalidate: "public, max-age=0, must-revalidate"
};
export function getFilenameAndExtension(resourcePath) {
    const filename = path.basename(resourcePath);
    const [name, ext] = filename.split(".");
    return {
        name,
        ext
    };
}
function getContentType(resourcePath) {
    let { name , ext  } = getFilenameAndExtension(resourcePath);
    if (ext === "jpg") ext = "jpeg";
    if (name === "favicon" && ext === "ico") return "image/x-icon";
    if (name === "sitemap") return "application/xml";
    if (name === "robots") return "text/plain";
    if (name === "manifest") return "application/manifest+json";
    if (ext === "png" || ext === "jpeg" || ext === "ico" || ext === "svg") {
        return imageExtMimeTypeMap[ext];
    }
    return "text/plain";
}
// Strip metadata resource query string from `import.meta.url` to make sure the fs.readFileSync get the right path.
async function getStaticRouteCode(resourcePath, fileBaseName) {
    const cache = fileBaseName === "favicon" ? "public, max-age=0, must-revalidate" : process.env.NODE_ENV !== "production" ? cacheHeader.none : cacheHeader.longCache;
    const code = `\
import { NextResponse } from 'next/server'

const contentType = ${JSON.stringify(getContentType(resourcePath))}
const buffer = Buffer.from(${JSON.stringify((await fs.promises.readFile(resourcePath)).toString("base64"))}, 'base64'
  )

export function GET() {
  return new NextResponse(buffer, {
    headers: {
      'Content-Type': contentType,
      'Cache-Control': ${JSON.stringify(cache)},
    },
  })
}

export const dynamic = 'force-static'
`;
    return code;
}
function getDynamicTextRouteCode(resourcePath) {
    return `\
import { NextResponse } from 'next/server'
import handler from ${JSON.stringify(resourcePath)}
import { resolveRouteData } from 'next/dist/build/webpack/loaders/metadata/resolve-route-data'

const contentType = ${JSON.stringify(getContentType(resourcePath))}
const fileType = ${JSON.stringify(getFilenameAndExtension(resourcePath).name)}

export async function GET() {
  const data = await handler()
  const content = resolveRouteData(data, fileType)

  return new NextResponse(content, {
    headers: {
      'Content-Type': contentType,
      'Cache-Control': ${JSON.stringify(cacheHeader.revalidate)},
    },
  })
}
`;
}
// <metadata-image>/[id]/route.js
function getDynamicImageRouteCode(resourcePath) {
    return `\
import { NextResponse } from 'next/server'
import * as _imageModule from ${JSON.stringify(resourcePath)}

const imageModule = { ..._imageModule }

const handler = imageModule.default
const generateImageMetadata = imageModule.generateImageMetadata

export async function GET(_, ctx) {
  const { __metadata_id__ = [], ...params } = ctx.params || {}
  const targetId = __metadata_id__[0]
  let id = undefined
  const imageMetadata = generateImageMetadata ? await generateImageMetadata({ params }) : null

  if (imageMetadata) {
    id = imageMetadata.find((item) => {
      if (process.env.NODE_ENV !== 'production') {
        if (item?.id == null) {
          throw new Error('id property is required for every item returned from generateImageMetadata')
        }
      }
      return item.id.toString() === targetId
    })?.id
    if (id == null) {
      return new NextResponse('Not Found', {
        status: 404,
      })
    }
  }
  return handler({ params: ctx.params ? params : undefined, id })
}
`;
}
function getDynamicSiteMapRouteCode(resourcePath, page) {
    let staticGenerationCode = "";
    if (process.env.NODE_ENV === "production" && page.includes("[__metadata_id__]")) {
        staticGenerationCode = `\
export async function generateStaticParams() {
  const sitemaps = await generateSitemaps()
  const params = []

  for (const item of sitemaps) {
    params.push({ __metadata_id__: item.id.toString() + '.xml' })
  }
  return params
}
    `;
    }
    const code = `\
import { NextResponse } from 'next/server'
import * as _sitemapModule from ${JSON.stringify(resourcePath)}
import { resolveRouteData } from 'next/dist/build/webpack/loaders/metadata/resolve-route-data'

const sitemapModule = { ..._sitemapModule }
const handler = sitemapModule.default
const generateSitemaps = sitemapModule.generateSitemaps
const contentType = ${JSON.stringify(getContentType(resourcePath))}
const fileType = ${JSON.stringify(getFilenameAndExtension(resourcePath).name)}

export async function GET(_, ctx) {
  const { __metadata_id__ = [], ...params } = ctx.params || {}
  const targetId = __metadata_id__[0]
  let id = undefined
  const sitemaps = generateSitemaps ? await generateSitemaps() : null

  if (sitemaps) {
    id = sitemaps.find((item) => {
      if (process.env.NODE_ENV !== 'production') {
        if (item?.id == null) {
          throw new Error('id property is required for every item returned from generateSitemaps')
        }
      }
      return item.id.toString() === targetId
    })?.id
    if (id == null) {
      return new NextResponse('Not Found', {
        status: 404,
      })
    }
  }

  const data = await handler({ id })
  const content = resolveRouteData(data, fileType)

  return new NextResponse(content, {
    headers: {
      'Content-Type': contentType,
      'Cache-Control': ${JSON.stringify(cacheHeader.revalidate)},
    },
  })
}

${staticGenerationCode}
`;
    return code;
}
// `import.meta.url` is the resource name of the current module.
// When it's static route, it could be favicon.ico, sitemap.xml, robots.txt etc.
// TODO-METADATA: improve the cache control strategy
const nextMetadataRouterLoader = async function() {
    const { resourcePath  } = this;
    const { page , isDynamic  } = this.getOptions();
    const { name: fileBaseName  } = getFilenameAndExtension(resourcePath);
    let code = "";
    if (isDynamic === "1") {
        if (fileBaseName === "robots" || fileBaseName === "manifest") {
            code = getDynamicTextRouteCode(resourcePath);
        } else if (fileBaseName === "sitemap") {
            code = getDynamicSiteMapRouteCode(resourcePath, page);
        } else {
            code = getDynamicImageRouteCode(resourcePath);
        }
    } else {
        code = await getStaticRouteCode(resourcePath, fileBaseName);
    }
    return code;
};
export default nextMetadataRouterLoader;

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