require("dotenv").config(); // Load environment variables from .env file
const express = require("express");
const axios = require("axios");
const bodyParser = require("body-parser");

const app = express();
const port = 3000; // Backend server will run on this port

// Middleware to parse JSON request bodies
app.use(bodyParser.json());

// API Key validation middleware
const validateApiKey = (req, res, next) => {
  const apiKey = req.headers["api-key"];
  const authHeader = req.headers["authorization"];

  // Try to extract token from Authorization: Bearer <token>
  let token = null;
  if (authHeader && authHeader.startsWith("Bearer ")) {
    token = authHeader.split(" ")[1];
  }

  const providedKey = apiKey || token;

  if (!providedKey) {
    return res.status(400).json({ error: "API key is missing" });
  }

  if (providedKey !== process.env.API_KEY) {
    return res.status(403).json({ error: "Invalid API key" });
  }

  next(); // Proceed if the API key is valid
};

// Forward request to localhost:11434 (ollama)
app.post("/api/generate/chat/completions", validateApiKey, async (req, res) => {
  try {
    // Forwarding the request to localhost:11434 with the prompt
    console.log("Body: ", req.body);
    const response = await axios.post(
      "http://localhost:11434/api/generate",
      req.body,
    );
    console.log("Response: ", response.data);

    // Send the response from localhost:11434 back to the client
    res.status(response.status).json(response.data);
  } catch (error) {
    // Enhanced error logging
    console.error(
      "Error forwarding request to localhost:11434:",
      error.response ? error.response.data : error.message,
    );
    res
      .status(500)
      .json({ error: "Internal Server Error", message: error.message });
  }
});

// Forward request to localhost:11434 (ollama)
app.post("/api/generate", validateApiKey, async (req, res) => {
  try {
    // Forwarding the request to localhost:11434 with the prompt
    const authHeader = req.headers["authorization"];
    console.log("Authorization header:", authHeader);
    console.log("checking api", apiKey !== process.env.API_KEY);
    console.log("Body: ", req.body);
    const response = await axios.post(
      "http://localhost:11434/api/generate",
      req.body,
    );

    // Send the response from localhost:11434 back to the client
    res.status(response.status).json(response.data);
  } catch (error) {
    // Enhanced error logging
    console.error(
      "Error forwarding request to localhost:11434:",
      error.response ? error.response.data : error.message,
    );
    res
      .status(500)
      .json({ error: "Internal Server Error", message: error.message });
  }
});

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