import path from "node:path";
import { fileURLToPath } from "node:url";
import type { IncomingMessage, ServerResponse } from "node:http";

import { defineConfig } from "vitest/config";
import react from "@vitejs/plugin-react";
import tailwindcss from "@tailwindcss/vite";
import type { ViteDevServer, PreviewServer } from "vite";

const __dirname = path.dirname(fileURLToPath(import.meta.url));

function userManagementSpaFallback() {
  const rewrite = (req: IncomingMessage) => {
    const url = req.url ?? '';
    if (!url.startsWith('/_um/') && url !== '/_um') return;
    if (/\.[a-zA-Z0-9]+$/.test(url.split('?')[0])) return;
    req.url = '/_um/index.html';
  };
  return {
    name: 'user-management-spa-fallback',
    configureServer(s: ViteDevServer) {
      s.middlewares.use((req: IncomingMessage, _r: ServerResponse, next: () => void) => {
        rewrite(req);
        next();
      });
      
    },
    configurePreviewServer(s: PreviewServer) {
      s.middlewares.use((req: IncomingMessage, _r: ServerResponse, next: () => void) => {
        rewrite(req);
        next();
      });
    },
  };
}

export default defineConfig({
  plugins: [userManagementSpaFallback(), react(), tailwindcss()],
  resolve: {
    alias: {
      "@": path.resolve(__dirname, "./src"),
      // Resolve from TS source so Vite gets ESM named exports (dist is CommonJS).
      "@edr/types": path.resolve(__dirname, "../../../packages/types/src/index.ts"),
    },
    // Force a single copy of these singletons so MantineProvider context is
    // shared between the backoffice app and @edr/ui-common (which ships its
    // own node_modules copy). Without this, two separate @mantine/core
    // instances are bundled and the context lookup fails at runtime.
    dedupe: ["react", "react-dom", "@mantine/core", "@mantine/hooks"],
  },
  server: {
    port: 5183,
    host: "0.0.0.0",
  },
  test: {
    environment: "node",
  },
});