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// Copyright (c) 2024 Cloudflare, Inc.
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// Licensed under the Apache 2.0 license found in the LICENSE file or at:
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//     https://opensource.org/licenses/Apache-2.0
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function base64ToBlob(base64, mimeType) {
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  const binaryString = atob(base64); // Decode Base64
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  const len = binaryString.length;
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  const bytes = new Uint8Array(len);
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  for (let i = 0; i < len; i++) {
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    bytes[i] = binaryString.charCodeAt(i);
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  }
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  return new Blob([bytes], { type: mimeType });
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}
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export default {
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  async fetch(request, env, ctx) {
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    const url = new URL(request.url);
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    if (url.pathname === '/to-everything/markdown/transformer') {
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      const body = await request.json();
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      const decoder = new TextDecoder('utf-8');
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      const result = [];
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      for (const file of body.files) {
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        if (file.name === 'headers.md') {
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          const newHeaders = new Headers(request.headers);
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          newHeaders.delete('content-length');
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          result.push({
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            name: file.name,
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            mimeType: file.mimeType,
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            format: 'markdown',
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            tokens: 0,
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            data: Object.fromEntries(newHeaders.entries()),
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          });
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        } else {
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          const fileblob = await base64ToBlob(file.data, file.mimeType);
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          const arr = await fileblob.arrayBuffer();
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          result.push({
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            name: file.name,
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            mimeType: file.mimeType,
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            format: 'markdown',
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            tokens: 0,
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            data: decoder.decode(arr),
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          });
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        }
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      }
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      return Response.json({
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        success: true,
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        result: result,
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      });
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    }
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    if (url.pathname === '/to-everything/markdown/supported') {
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      return Response.json({
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        success: true,
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        result: [
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          {
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            extension: '.md',
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            mimeType: 'text/markdown',
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          },
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          {
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            extension: '.png',
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            mimeType: 'image/png',
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          },
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        ],
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      });
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    }
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  },
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};