import { resolve } from 'path'
import react from '@vitejs/plugin-react'
import { defineConfig } from 'vite'
import cssInjectedByJsPlugin from 'vite-plugin-css-injected-by-js'

// IIFE format: component registers itself in window.GlitchComponents at load time.
// react/jsx-runtime is intentionally NOT external — it gets bundled and reads from window.React.
// Host apps must expose window.React and window.ReactDOM before loading any component script.
export default defineConfig(({ mode }) => ({
  plugins: [react(), cssInjectedByJsPlugin()],
  build: {
    lib: {
      entry: resolve(__dirname, 'src/index.tsx'),
      name: 'GlitchComponent',
      fileName: () => 'bloodsugar.js',
      formats: ['iife']
    },
    rollupOptions: {
      external: ['react', 'react-dom'],
      output: {
        globals: {
          react: 'React',
          'react-dom': 'ReactDOM',
        },
        assetFileNames: 'assets/[name][extname]',
        exports: 'named'
      }
    },
    sourcemap: true,
    minify: mode === 'production'
  },
  server: {
    port: 3001,
    open: true
  }
}))