import "dotenv/config";
import express from "express";
import { createServer } from "http";
import net from "net";
import path from "path";
import fs from "fs";
import { createExpressMiddleware } from "@trpc/server/adapters/express";
import { registerOAuthRoutes } from "./oauth";
import { appRouter } from "../routers";
import { createContext } from "./context";
import { serveStatic, setupVite } from "./vite";

function isPortAvailable(port: number): Promise<boolean> {
  return new Promise(resolve => {
    const server = net.createServer();
    server.listen(port, () => {
      server.close(() => resolve(true));
    });
    server.on("error", () => resolve(false));
  });
}

async function findAvailablePort(startPort: number = 3000): Promise<number> {
  for (let port = startPort; port < startPort + 20; port++) {
    if (await isPortAvailable(port)) {
      return port;
    }
  }
  throw new Error(`No available port found starting from ${startPort}`);
}

async function startServer() {
  const app = express();
  const server = createServer(app);
  // Configure body parser with larger size limit for file uploads
  app.use(express.json({ limit: "50mb" }));
  app.use(express.urlencoded({ limit: "50mb", extended: true }));
  // OAuth callback under /api/oauth/callback
  registerOAuthRoutes(app);
  // Serve local storage files
  app.use("/storage", express.static("storage"));

  // Route de téléchargement forcé du PDF annoté BAP
  // Accepte les chemins avec sous-dossiers : /api/download-bap/2026-04/filename.pdf
  // ou via query param pdfPath : /api/download-bap/file.pdf?pdfPath=/storage/2026-04/file.pdf
  app.get("/api/download-bap", (req, res) => {
    // Mode 1 : query param pdfPath (chemin complet depuis /storage/...)
    const pdfPath = req.query.pdfPath as string | undefined;
    if (!pdfPath) {
      res.status(400).json({ error: "Paramètre pdfPath manquant" });
      return;
    }
    // Sécurité : s'assurer que le chemin est bien dans le dossier storage
    const normalized = path.normalize(pdfPath).replace(/^\/+/, '');
    if (normalized.startsWith('..') || !normalized.startsWith('storage')) {
      res.status(403).json({ error: "Accès refusé" });
      return;
    }
    const storagePath = path.resolve(normalized);
    if (!fs.existsSync(storagePath)) {
      res.status(404).json({ error: "Fichier introuvable" });
      return;
    }
    const filename = path.basename(storagePath);
    res.setHeader("Content-Disposition", `attachment; filename="${encodeURIComponent(filename)}"`);
    res.setHeader("Content-Type", "application/pdf");
    res.sendFile(storagePath);
  });

  // Compat. ancienne route avec :filename (sans sous-dossier)
  app.get("/api/download-bap/:filename", (req, res) => {
    const filename = path.basename(req.params.filename);
    // Chercher dans tous les sous-dossiers de storage
    const storageRoot = path.resolve("storage");
    let found: string | null = null;
    try {
      const subdirs = fs.readdirSync(storageRoot);
      for (const sub of subdirs) {
        const candidate = path.join(storageRoot, sub, filename);
        if (fs.existsSync(candidate)) { found = candidate; break; }
      }
      // Aussi essayer directement dans storage/
      const direct = path.join(storageRoot, filename);
      if (!found && fs.existsSync(direct)) found = direct;
    } catch { /* ignore */ }
    if (!found) {
      res.status(404).json({ error: "Fichier introuvable" });
      return;
    }
    res.setHeader("Content-Disposition", `attachment; filename="${encodeURIComponent(filename)}"`);
    res.setHeader("Content-Type", "application/pdf");
    res.sendFile(found);
  });

  // tRPC API
  app.use(
    "/api/trpc",
    createExpressMiddleware({
      router: appRouter,
      createContext,
    })
  );
  // development mode uses Vite, production mode uses static files
  if (process.env.NODE_ENV === "development") {
    await setupVite(app, server);
  } else {
    serveStatic(app);
  }

  const preferredPort = parseInt(process.env.PORT || "3000");
  const port = await findAvailablePort(preferredPort);

  if (port !== preferredPort) {
    console.log(`Port ${preferredPort} is busy, using port ${port} instead`);
  }

  server.listen(port, () => {
    console.log(`Server running on http://localhost:${port}/`);
  });
}

startServer().catch(console.error);