import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import { nodePolyfills } from 'vite-plugin-node-polyfills'

// Strip sourceMappingURL comments from problematic vendor files to silence missing sourcemap warnings
function stripVendorSourcemaps() {
  const vendorRe = /node_modules\/(?:@walletconnect|@cosmjs|@cosmsnap)\//;
  const mapLine = /\/\/#\s*sourceMappingURL=.*$/gm;
  return {
    name: 'strip-vendor-sourcemaps',
    enforce: 'post' as const,
    transform(code: string, id: string) {
      if (!vendorRe.test(id)) return null;
      if (!mapLine.test(code)) return null;
      const cleaned = code.replace(mapLine, '');
      return { code: cleaned, map: null };
    }
  }
}

// Esbuild plugin variant for optimizeDeps stage
function esbuildStripVendorSourcemaps() {
  const vendorRe = /node_modules\/(?:@walletconnect|@cosmjs|@cosmsnap)\//;
  const mapLine = /\/\/#\s*sourceMappingURL=.*$/gm;
  return {
    name: 'esbuild-strip-vendor-sourcemaps',
    setup(build: any) {
      build.onLoad({ filter: /\.(mjs|cjs|js)$/ }, async (args: any) => {
        if (!vendorRe.test(args.path)) return;
        const fs = await import('fs/promises');
        try {
          const code = await fs.readFile(args.path, 'utf8');
          if (!mapLine.test(code)) return;
          const cleaned = code.replace(mapLine, '');
          return { contents: cleaned, loader: 'js' };
        } catch {
          return;
        }
      });
    }
  }
}

export default defineConfig({
  plugins: [react(), nodePolyfills(), stripVendorSourcemaps()],
  define: { global: 'globalThis' },
  server: { port: 3000 },
  optimizeDeps: {
    exclude: [
      '@getpara/cosmos-wallet-connectors',
      '@getpara/solana-wallet-connectors',
      '@cosmjs/*',
      '@cosmsnap/*'
    ],
    esbuildOptions: {
      sourcemap: false,
      plugins: [esbuildStripVendorSourcemaps()]
    }
  },
  build: {
    sourcemap: false,
    rollupOptions: {
      external: [
        '@getpara/cosmos-wallet-connectors',
        '@getpara/solana-wallet-connectors',
        /@cosmjs\//,
        /@cosmsnap\//
      ]
    }
  }
})