import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'

const chunkSizeWarningLimit = 850

function chunkGroup(id: string) {
  const normalizedId = id.replaceAll('\\', '/')
  if (normalizedId.includes('/node_modules/')) {
    // Heavy, self-contained leaf libs (no Vue import) — isolate so they don't
    // bloat the main vendor chunk. Pure parsers, zero cross-chunk init-order risk.
    if (normalizedId.includes('/node_modules/pdfjs-dist/')) {
      return 'vendor-pdfjs'
    }
    if (normalizedId.includes('/node_modules/xlsx/')) {
      return 'vendor-xlsx'
    }
    if (normalizedId.includes('/node_modules/mammoth/')) {
      return 'vendor-mammoth'
    }
    // Element Plus + its icons depend on Vue one-way (no circular) — proven safe
    // to keep as their own cacheable chunks.
    if (normalizedId.includes('/node_modules/@element-plus/icons-vue/')) {
      return 'vendor-element-icons'
    }
    if (normalizedId.includes('/node_modules/element-plus/')) {
      return 'vendor-element-plus'
    }
    // vue + @vue + EVERY Vue-coupled lib (tiptap / prosemirror / yjs /
    // vuedraggable / sortablejs ...) MUST share one chunk. Splitting Vue into its
    // own `vendor-vue` chunk let those libs evaluate before Vue finished
    // initializing, throwing a cross-chunk TDZ at runtime:
    // "ReferenceError: Cannot access 'W' before initialization" → blank page.
    // Circular deps WITHIN a single chunk are hoisted correctly by Rollup.
    return 'vendor'
  }
  if (normalizedId.includes('/src/components/erp/ErpPageRenderer.vue')) {
    return 'erp-page-renderer'
  }
  if (normalizedId.includes('/src/components/erp/')) {
    return 'erp-components'
  }
}

export default defineConfig({
  plugins: [vue()],
  base: '/',
  server: {
    port: 5175,
    proxy: {
      // OA backend (Java / Spring Boot). All OA calls live under /api/oa/*.
      // Proxying keeps the browser same-origin in dev, so no CORS is needed.
      '/api': {
        target: 'http://localhost:8090',
        changeOrigin: true,
        secure: false
      },
      // Real-time collaboration WebSocket (yjs CRDT relay). ws:true upgrades the
      // connection so /ws/collab/{docId} reaches the backend in dev too.
      '/ws': {
        target: 'ws://localhost:8090',
        ws: true,
        changeOrigin: true
      }
    }
  },
  build: {
    // Single-deployable: build straight into the Spring Boot backend's static
    // resources, so `gradlew bootJar` then bundles the SPA into the one runnable jar
    // (served on the same port as the API — no separate vite / proxy / CORS).
    outDir: '../../../../oa-backend/src/main/resources/static',
    assetsDir: 'assets',
    emptyOutDir: true,
    chunkSizeWarningLimit,
    rollupOptions: {
      output: {
        manualChunks: chunkGroup
      }
    }
  }
})