import react from '@vitejs/plugin-react';
import { defineConfig } from 'vitest/config';

// The config is kept minimal: in Vite 8 (Rolldown) some old options became a silent no-op, so
// every line below is here deliberately and with a reason.
export default defineConfig({
  plugins: [react()],
  // A proxy rather than the platform's address in the code: the frontend must live on the SAME
  // origin. That is a fact and not a setting — the platform has no CORS layer at all, and a
  // preflight OPTIONS carrying a foreign Origin is answered 401 by the session guard (measured on
  // the live binary, acceptance №15). A cross-origin browser client is therefore inoperable as a
  // class, and in development the only working path is our own origin over a proxy.
  // Without TM_PLATFORM the proxy does not come up: by default the network is held by MSW.
  server: process.env.TM_PLATFORM
    ? { proxy: { '/v0': process.env.TM_PLATFORM, '/auth': process.env.TM_PLATFORM } }
    : undefined,
  // The same flag is visible to the client: without it the mock worker would intercept the request
  // BEFORE the proxy, and the setting would look broken rather than shadowed.
  define: {
    'import.meta.env.VITE_TM_PLATFORM': JSON.stringify(process.env.TM_PLATFORM ?? ''),
  },
  // Lightning CSS instead of esbuild for minification — the pin from STACK_DECISIONS §2.
  build: { cssMinify: 'lightningcss' },
  test: {
    environment: 'happy-dom',
    // By default Vitest serves an empty stub instead of CSS — the token contract test would then
    // be checking emptiness and would always be green.
    css: true,
    include: ['src/**/*.test.{ts,tsx}'],
  },
});