import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import process from 'node:process'

// https://vite.dev/config/
export default defineConfig({
  plugins: [react()],
  build: {
    // Clean stale chunks, including retired feature bundles.
    emptyOutDir: true,
    cssCodeSplit: false,
    modulePreload: false,
    rollupOptions: {
      onwarn(warning, warn) {
        // Manually splitting packages that depend on each other can create a circular chunk graph.
        // That graph built successfully in the past but crashed before React mounted, leaving only
        // the static skeleton on screen. Treat it as a release-blocking error from now on.
        if (warning.code === 'CIRCULAR_CHUNK') {
          throw new Error(`Circular production chunk: ${warning.message}`)
        }
        warn(warning)
      },
      output: {
        entryFileNames: 'assets/[name]-[hash].js',
        chunkFileNames(chunkInfo) {
          if (chunkInfo.name === 'app-shell') return 'assets/app-shell-[hash].js'
          if (chunkInfo.name === 'app-api') return 'assets/app-api-[hash].js'
          if (chunkInfo.name === 'vendor') return 'assets/vendor-[hash].js'
          return 'assets/[name]-[hash].js'
        },
        assetFileNames(assetInfo) {
          if (assetInfo.name?.endsWith('.css')) {
            return 'assets/style-[hash][extname]'
          }
          return 'assets/[name]-[hash][extname]'
        },
        manualChunks(id) {
          const normalizedId = id.replace(/\\/g, '/')

          if (normalizedId.includes('node_modules') || normalizedId.includes('/.vite/deps/')) {
            // Keep mutually dependent third-party packages in one chunk. React, Ant Design,
            // charts and Cube clients share runtime helpers and cannot be split safely by path.
            return 'vendor'
          }

          if (normalizedId.includes('/src/api/')) return 'app-api'
          if (normalizedId.includes('/src/constants/')) return 'app-shell'
          if (normalizedId.includes('/src/layouts/')) return 'app-shell'
          if (
            normalizedId.includes('/src/components/AppVersionGuard.jsx') ||
            normalizedId.includes('/src/components/ErrorBoundary.jsx')
          ) {
            return 'app-shell'
          }

          return undefined
        },
      },
    },
  },
  server: {
    proxy: {
      '/api': {
        target: process.env.VITE_API_PROXY_TARGET || 'http://localhost:4001',
        changeOrigin: true,
      },
      '/cubejs-api': {
        target: process.env.VITE_API_PROXY_TARGET || 'http://localhost:4001',
        changeOrigin: true,
      },
    },
  },
})