import { defineConfig } from 'tsup';
import { resolve, dirname } from 'path';
import { fileURLToPath } from 'url';

const __dirname = dirname(fileURLToPath(import.meta.url));

export default defineConfig({
  entry: ['src/index.ts'],
  format: ['esm'],
  target: 'es2022',
  outDir: 'dist',
  clean: true,
  sourcemap: true,
  dts: true,
  bundle: true,
  noExternal: [/.*/],
  banner: { js: '#!/usr/bin/env node' },
  esbuildPlugins: [
    {
      name: 'fix-mcp-sdk-deps',
      setup(build) {
        const explicitExports = new Set(['server', 'client', 'validation', 'experimental']);
        build.onResolve({ filter: /^@modelcontextprotocol\/sdk\/.+/ }, (args) => {
          const subpath = args.path.replace('@modelcontextprotocol/sdk/', '');
          const topLevel = subpath.split('/')[0];
          if (explicitExports.has(topLevel) && !subpath.includes('/')) return undefined;
          return {
            path: resolve(
              __dirname,
              'node_modules/@modelcontextprotocol/sdk/dist/esm',
              subpath + '.js',
            ),
          };
        });

        build.onResolve({ filter: /^ajv-formats/ }, (args) => {
          return { path: args.path, namespace: 'ajv-stub' };
        });
        build.onResolve({ filter: /^ajv\/dist\// }, (args) => {
          return { path: args.path, namespace: 'ajv-stub' };
        });
        build.onLoad({ filter: /.*/, namespace: 'ajv-stub' }, () => {
          return { contents: 'module.exports = function() {};', loader: 'js' };
        });
      },
    },
  ],
});