import express from "express";
import ViteExpress from "vite-express";
import cors from "cors";
import dotenv from "dotenv";
import apiRoutes from "./server/api/index.js";
import { pouchApp, PouchDB } from "./server/services/databaseService.js";
import { dbAuthMiddleware } from "./server/middleware/dbAuth.js";

// Load .env.local first, then fall back to .env
dotenv.config({ path: '.env.local' });
dotenv.config();

const app = express();

// CORS configuration for split deployment
// In combined mode, same-origin requests don't need CORS
const allowedOrigins = process.env.ALLOWED_ORIGINS?.split(",") || [];
if (allowedOrigins.length > 0) {
  app.use(cors({
    origin: allowedOrigins,
    credentials: true,
  }));
}

// Parse JSON for all routes EXCEPT /pouchdb (express-pouchdb handles its own body parsing)
app.use((req, res, next) => {
  if (req.path.startsWith('/pouchdb')) {
    return next();
  }
  express.json()(req, res, next);
});

// API routes
app.use("/api", apiRoutes);

// Test endpoint to verify PouchDB is working
app.get("/pouchdb-test/:dbname", async (req, res) => {
  try {
    const dbName = req.params.dbname;
    console.log(`[Test] Creating database: ${dbName}`);
    const db = new PouchDB(dbName);
    const info = await db.info();
    console.log(`[Test] Database info:`, info);

    // Try to add a test doc
    const result = await db.put({ _id: 'test-doc', hello: 'world' });
    console.log(`[Test] Added doc:`, result);

    // Read it back
    const doc = await db.get('test-doc');
    console.log(`[Test] Got doc:`, doc);

    res.json({ success: true, info, doc });
  } catch (err) {
    console.error(`[Test] Error:`, err);
    res.status(500).json({ error: err.message, stack: err.stack });
  }
});

// PouchDB database sync endpoint with auth middleware
// Public databases (/pouchdb/public-*) are accessible without auth
// Private databases (/pouchdb/private-*) require authentication
// Patch req.query for Express 5 compatibility with express-pouchdb
app.use("/pouchdb", dbAuthMiddleware, (req, res, next) => {
  // Express 5 makes req.query read-only, but express-pouchdb needs to write to it
  // Redefine as writable property
  Object.defineProperty(req, 'query', {
    value: { ...req.query },
    writable: true,
    configurable: true
  });
  next();
}, pouchApp, (err, req, res, next) => {
  // Error handler for express-pouchdb
  console.error('[PouchDB Error]', err);
  res.status(500).json({ error: err.message, stack: err.stack });
});

// Check if running in API-only mode (split deployment)
const apiOnly = process.env.API_ONLY === "true";

if (apiOnly) {
  // API-only mode: no static file serving
  app.listen(process.env.PORT || 3000, () => {
    console.log(`API server running on port ${process.env.PORT || 3000}`);
  });
} else {
  // Combined mode: Vite handles static files + SPA
  ViteExpress.listen(app, process.env.PORT || 3001, () => {
    console.log(`Server running on port ${process.env.PORT || 3001}`);
  });
}