import express from "express";
import helmet from "helmet";
import path from "path";
import { fileURLToPath } from "url";
import rateLimit from "express-rate-limit";
import { convertRouter } from "./routes/convert.js";
import { templatesRouter } from "./routes/templates.js";
import { healthRouter } from "./routes/health.js";
import { signupRouter } from "./routes/signup.js";
import { billingRouter } from "./routes/billing.js";
import { authMiddleware } from "./middleware/auth.js";
import { usageMiddleware } from "./middleware/usage.js";
import { getUsageStats } from "./middleware/usage.js";
import { initBrowser, closeBrowser } from "./services/browser.js";
import { loadKeys, getAllKeys } from "./services/keys.js";

const app = express();
const PORT = parseInt(process.env.PORT || "3100", 10);

// Load API keys from persistent store
loadKeys();

app.use(helmet());
// Raw body for Stripe webhook signature verification
app.use("/v1/billing/webhook", express.raw({ type: "application/json" }));
app.use(express.json({ limit: "2mb" }));
app.use(express.text({ limit: "2mb", type: "text/*" }));

// Rate limiting
const limiter = rateLimit({
  windowMs: 60_000,
  max: 100,
  standardHeaders: true,
  legacyHeaders: false,
});
app.use(limiter);

// Public routes
app.use("/health", healthRouter);
app.use("/v1/signup", signupRouter);
app.use("/v1/billing", billingRouter);

// Authenticated routes
app.use("/v1/convert", authMiddleware, usageMiddleware, convertRouter);
app.use("/v1/templates", authMiddleware, usageMiddleware, templatesRouter);

// Admin: usage stats
app.get("/v1/usage", authMiddleware, (_req, res) => {
  res.json(getUsageStats());
});

// Landing page
const __dirname = path.dirname(fileURLToPath(import.meta.url));
app.use(express.static(path.join(__dirname, "../public")));

// API root
app.get("/api", (_req, res) => {
  res.json({
    name: "DocFast API",
    version: "0.2.0",
    endpoints: [
      "POST /v1/signup/free — Get a free API key",
      "POST /v1/convert/html",
      "POST /v1/convert/markdown",
      "POST /v1/convert/url",
      "POST /v1/templates/:id/render",
      "GET  /v1/templates",
      "POST /v1/billing/checkout — Start Pro subscription",
    ],
  });
});

async function start() {
  await initBrowser();
  console.log(`Loaded ${getAllKeys().length} API keys`);
  app.listen(PORT, () => console.log(`DocFast API running on :${PORT}`));

  const shutdown = async () => {
    console.log("Shutting down...");
    await closeBrowser();
    process.exit(0);
  };
  process.on("SIGTERM", shutdown);
  process.on("SIGINT", shutdown);
}

start().catch((err) => {
  console.error("Failed to start:", err);
  process.exit(1);
});

export { app };