import { NodeGlobalsPolyfillPlugin } from '@esbuild-plugins/node-globals-polyfill'
import { NodeModulesPolyfillPlugin } from '@esbuild-plugins/node-modules-polyfill'
import { build } from 'esbuild'
import fs from 'fs'
import { relative, resolve } from "node:path";
import path from "path"


// ChatGPT
function isNodeCompat() {
  const filePath = 'wrangler.toml'; // Hardcoded file path as 'wrangler.toml'

  try {
    // Read the content of the file
    const data = fs.readFileSync(filePath, 'utf8');

    // Parse the content to extract variables
    const lines = data.split('\n');
    const variables = {};
    lines.forEach((line) => {
      const match = line.match(/^\s*([\w_]+)\s*=\s*(.+)/);
      if (match) {
        const key = match[1];
        const value = match[2].trim();
        variables[key] = value;
      }
    });

    // Check for the presence and value of node_compat
    return variables.node_compat && variables.node_compat.toLowerCase() === 'true';
  } catch (err) {
    console.error('Error reading the file:', err);
    return false;
  }
}

let plugins = [
  {
    name: "Copy wasm next to bundle",
    setup(build) {
      build.onResolve({ filter: /.*\.(wasm)$/ }, async (args) => {
        const to = resolve(path.join("dist-esbuild", args.path))
        fs.mkdirSync(path.dirname(to), { recursive: true })
        fs.copyFileSync(resolve(args.resolveDir, args.path), to)
        return {
          path: args.path,
          external: true
        };
      });
    },
  },
  // via https://github.com/cloudflare/workers-sdk/blob/3b5407a968189e60974233c5db8615162db37fd2/packages/wrangler/src/deployment-bundle/esbuild-plugins/cloudflare-internal.ts
  {
    name: "Cloudflare internal imports plugin",
    setup(pluginBuild) {
      pluginBuild.onResolve({ filter: /^cloudflare:.*/ }, () => {
        return { external: true };
      });
    },
  }
]
if (isNodeCompat() === true) {
  console.log("found node_compat=true, adding plugins")
  // via https://github.com/cloudflare/workers-sdk/blob/1b34878287e3c98e8743e0a9c30b860107d4fcbe/packages/wrangler/src/deployment-bundle/bundle.ts#L327-L329
  plugins.push(
    NodeGlobalsPolyfillPlugin({ buffer: true }), 
    NodeModulesPolyfillPlugin()
  )
}

let result = await build({
  plugins: plugins,
  entryPoints: ['function.js'],
  bundle: true,
  outfile: 'dist-esbuild/function.js',
  metafile: true,
  format: 'esm',
  sourcemap: 'external',
  platform: 'node',
  // via https://github.com/cloudflare/workers-sdk/blob/3b5407a968189e60974233c5db8615162db37fd2/packages/wrangler/src/deployment-bundle/bundle.ts#L27-L31
  target: "es2022",
	loader: { ".js": "jsx", ".mjs": "jsx", ".cjs": "jsx" },
  // mainFields: ['workerd', 'worker', 'Here is our `esbuild.mjs`: 
browser', 'module', 'main'],
  conditions: ["workerd", "worker", "browser"]
})

fs.writeFileSync('dist-esbuild/meta.json', JSON.stringify(result.metafile, null, 2))