import { svelte } from '@sveltejs/vite-plugin-svelte'
import tailwindcss from '@tailwindcss/vite'
import { defineConfig } from 'vite'
import { readFileSync, existsSync } from 'fs'

// In Docker, VERSION is copied into the build WORKDIR (/build/web/VERSION).
// In local dev, the cwd is web/ and VERSION is two dirs up (../../VERSION
// from vite.config.ts location in web/). Try both.
let version: string
if (existsSync('../VERSION')) {
  version = readFileSync('../VERSION', 'utf-8').trim()
} else {
  version = readFileSync('VERSION', 'utf-8').trim()
}

// Injects OIKOS_API_TOKEN into proxied /api requests in dev — the API no
// longer has a dev-open bypass (plans/2026-07-12-wails-desktop-app.md 0.4),
// so `OIKOS_API_TOKEN=dev-token npm run dev` needs this to reach it.
function authProxy(target: string, rewrite?: (path: string) => string) {
  return {
    target,
    ...(rewrite ? { rewrite } : {}),
    configure: (proxy: any) => {
      proxy.on('proxyReq', (proxyReq: any) => {
        const token = process.env.OIKOS_API_TOKEN
        if (token) proxyReq.setHeader('Authorization', `Bearer ${token}`)
      })
    }
  }
}

export default defineConfig({
  plugins: [tailwindcss(), svelte()],
  base: '/',
  define: {
    __OIKOS_VERSION__: JSON.stringify(`v${version}`),
  },
  resolve: {
    alias: { $lib: '/src/lib' }
  },
  build: {
    outDir: 'dist',
    emptyOutDir: true
  },
  server: {
    proxy: {
      '/api': authProxy('http://localhost:8090'),
      // Production Caddy strips /agent before forwarding to nomos
      // (compose/caddy/Caddyfile.oikos handle_path /agent/*); match that
      // here so dev and prod agree on nomos's actual route paths.
      '/agent': authProxy('http://localhost:8092', (path) => path.replace(/^\/agent/, ''))
    }
  }
})