import fs from 'fs';
import path from 'path';
import { imageExtMimeTypeMap } from '../../../lib/mime-type';
import { getLoaderModuleNamedExports } from './utils';
function errorOnBadHandler(resourcePath) {
    return `
  if (typeof handler !== 'function') {
    throw new Error('Default export is missing in ${JSON.stringify(resourcePath)}')
  }
  `;
}
/* re-export the userland route configs */ async function createReExportsCode(resourcePath, loaderContext) {
    const exportNames = await getLoaderModuleNamedExports(resourcePath, loaderContext);
    // Re-export configs but avoid conflicted exports
    const reExportNames = exportNames.filter((name)=>name !== 'default' && name !== 'generateSitemaps');
    return reExportNames.length > 0 ? `export { ${reExportNames.join(', ')} } from ${JSON.stringify(resourcePath)}\n` : '';
}
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('.', 2);
    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';
}
async function getStaticAssetRouteCode(resourcePath, fileBaseName) {
    const cache = fileBaseName === 'favicon' ? 'public, max-age=0, must-revalidate' : process.env.NODE_ENV !== 'production' ? cacheHeader.none : cacheHeader.longCache;
    const isTwitter = fileBaseName === 'twitter-image';
    const isOpenGraph = fileBaseName === 'opengraph-image';
    // Twitter image file size limit is 5MB.
    // General Open Graph image file size limit is 8MB.
    // x-ref: https://developer.x.com/en/docs/x-for-websites/cards/overview/summary
    // x-ref(facebook): https://developers.facebook.com/docs/sharing/webmasters/images
    const fileSizeLimit = isTwitter ? 5 : 8;
    const imgName = isTwitter ? 'Twitter' : 'Open Graph';
    const code = `\
/* static asset route */
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'
  )

if (${isTwitter || isOpenGraph}) {
  const fileSizeInMB = buffer.byteLength / 1024 / 1024
  if (fileSizeInMB > ${fileSizeLimit}) {
    throw new Error('File size for ${imgName} image ${JSON.stringify(resourcePath)} exceeds ${fileSizeLimit}MB. ' +
    \`(Current: \${fileSizeInMB.toFixed(2)}MB)\n\` +
    'Read more: https://nextjs.org/docs/app/api-reference/file-conventions/metadata/opengraph-image#image-files-jpg-png-gif'
    )
  }
}

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

export const dynamic = 'force-static'
`;
    return code;
}
async function getDynamicTextRouteCode(resourcePath, loaderContext) {
    return `\
/* dynamic asset route */
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)}

${errorOnBadHandler(resourcePath)}
${await createReExportsCode(resourcePath, loaderContext)}

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
async function getDynamicImageRouteCode(resourcePath, loaderContext) {
    return `\
/* dynamic image route */
import { NextResponse } from 'next/server'
import * as userland from ${JSON.stringify(resourcePath)}

const imageModule = { ...userland }

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

${errorOnBadHandler(resourcePath)}
${await createReExportsCode(resourcePath, loaderContext)}

export async function GET(_, ctx) {
  const params = await ctx.params
  const { __metadata_id__, ...rest } = params || {}
  const restParams = params ? rest : undefined
  const targetId = __metadata_id__
  let id = undefined
  
  if (generateImageMetadata) {
    const imageMetadata = await generateImageMetadata({ params: restParams })
    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: restParams, id })
}
`;
}
async function getDynamicSitemapRouteCode(resourcePath, loaderContext) {
    let staticGenerationCode = '';
    const exportNames = await getLoaderModuleNamedExports(resourcePath, loaderContext);
    const hasGenerateSitemaps = exportNames.includes('generateSitemaps');
    if (process.env.NODE_ENV === 'production' && hasGenerateSitemaps) {
        staticGenerationCode = `\
    /* dynamic sitemap route */
    export async function generateStaticParams() {
      const sitemaps = await sitemapModule.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 userland from ${JSON.stringify(resourcePath)}
import { resolveRouteData } from 'next/dist/build/webpack/loaders/metadata/resolve-route-data'

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

${errorOnBadHandler(resourcePath)}
${await createReExportsCode(resourcePath, loaderContext)}

export async function GET(_, ctx) {
  const { __metadata_id__: id, ...params } = await ctx.params || {}
  const hasXmlExtension = id ? id.endsWith('.xml') : false

  if (id && !hasXmlExtension) {
    return new NextResponse('Not Found', {
      status: 404,
    })
  }

  if (process.env.NODE_ENV !== 'production' && sitemapModule.generateSitemaps) {
    const sitemaps = await sitemapModule.generateSitemaps()
    for (const item of sitemaps) {
      if (item?.id == null) {
        throw new Error('id property is required for every item returned from generateSitemaps')
      }
    }
  }

  const targetId = id && hasXmlExtension ? id.slice(0, -4) : undefined

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

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

${staticGenerationCode}
`;
    return code;
}
// 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 { isDynamicRouteExtension, filePath } = this.getOptions();
    const { name: fileBaseName } = getFilenameAndExtension(filePath);
    this.addDependency(filePath);
    let code = '';
    if (isDynamicRouteExtension === '1') {
        if (fileBaseName === 'robots' || fileBaseName === 'manifest') {
            code = await getDynamicTextRouteCode(filePath, this);
        } else if (fileBaseName === 'sitemap') {
            code = await getDynamicSitemapRouteCode(filePath, this);
        } else {
            code = await getDynamicImageRouteCode(filePath, this);
        }
    } else {
        code = await getStaticAssetRouteCode(filePath, fileBaseName);
    }
    return code;
};
export default nextMetadataRouterLoader;

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