import { defineConfig, loadEnv } from "vite";
import react from "@vitejs/plugin-react";

/** Proxy config that forwards client Host/Proto so NIP-98 URL validation matches. */
function proxyToBackendWithForwarded(backendTarget: string) {
  return {
    target: backendTarget,
    changeOrigin: true,
    configure: (proxy) => {
      proxy.on("proxyReq", (proxyReq, req) => {
        const host = (req.headers.host as string) || "";
        const proto = (req.headers["x-forwarded-proto"] as string) || "http";
        proxyReq.setHeader("X-Forwarded-Host", host);
        proxyReq.setHeader("X-Forwarded-Proto", proto);
      });
    },
  };
}

export default defineConfig(({ mode }) => {
  const env = loadEnv(mode, process.cwd(), "");
  const backendTarget = env.VITE_API_URL || "http://localhost:3001";

  return {
    plugins: [react()],
    build: {
      sourcemap: false,
      rollupOptions: {
        output: {
          manualChunks: {
            vendor: ["react", "react-dom", "react-router-dom"],
            nostr: ["nostr-tools"],
            ui: ["framer-motion", "qrcode", "canvas-confetti"],
          },
        },
      },
    },
    preview: {
      allowedHosts: ["faucet.lnpulse.app"],
    },
    server: {
      port: 5173,
      proxy: {
        "/api": {
          target: backendTarget,
          changeOrigin: true,
          rewrite: (path) => path.replace(/^\/api/, ""),
        },
        "/claim": proxyToBackendWithForwarded(backendTarget),
        "/auth": proxyToBackendWithForwarded(backendTarget),
        "/user": proxyToBackendWithForwarded(backendTarget),
        "/config": { target: backendTarget, changeOrigin: true },
        "/stats": { target: backendTarget, changeOrigin: true },
        "/deposit": { target: backendTarget, changeOrigin: true },
      },
    },
  };
});