//router/api.js
const cookieSession = require("cookie-session");
const express = require("express");
const bodyParser = require("body-parser");
let db = require("../pass_db");


const router = express.Router();

router.use(bodyParser.json());

const WEATHER_API_KEY = process.env.WEATHER_API_KEY;
const WEATHER_API_URL = process.env.WEATHER_API_URL;

// 註冊 API
router.post('/signup', (req, res) => {
  const { username, password } = req.body;
  if (db.createUser(username, password)) {
    // 註冊成功，進行自動登錄操作
    req.session.username = username;
    res.status(200).json({ success: true, data: { username } });
  } else {
    // 用戶名已存在
    res.status(400).json({ success: false, error: 'Username is already taken.' });
  }
});

// 登錄 API
router.post('/login', (req, res) => {
  const { username, password } = req.body;
  const user = db.authenticateUser(username, password);
  if (user) {
    req.session.username = username;
    res.status(200).json({ success: true, data: { username } });
  } else {
    res.status(401).json({ success: false, error: 'Invalid username or password.' });
  }
}); 


// 登出 API
router.post('/logout', (req, res) => {
  req.session = null;
  res.status(200).json({ success: true, data: null });
});

// 獲取會話 API
router.get('/getSession', (req, res) => {
  if (req.session.username) {
    res.status(200).json({ success: true, data: { username: req.session.username } });
  } else {
    res.status(200).json({ success: true, data: null });
  }
});

// 獲取投票數據 API
router.get('/votes/list', (req, res) => {
  const votes = db.getVotesAllDays();
  res.status(200).json({ success: true, data: votes });
});

// 設定投票 API (為SATIS Tier準備)
router.post('/votes/set', (req, res) => {
  const { username, date, vote } = req.body;
  if (req.session.username === username) {
    db.placeVote(username, date, vote);
    res.status(200).json({ success: true });
  } else {
    res.status(403).json({ success: false, error: "Unauthorized" });
  }
});

router.get("/weather", async (req, res) => {
  const { lat, lon } = req.query;
  try {
    const weatherResponse = await fetch(
      `${WEATHER_API_URL}?lat=${lat}&lon=${lon}&appid=${WEATHER_API_KEY}&units=metric`
    );
    const weatherData = await weatherResponse.json();

    if (!weatherResponse.ok) throw new Error("Weather API request failed.");

    res.json({ success: true, data: weatherData });
  } catch (error) {
    console.error(error);
    res
      .status(500)
      .json({ success: false, error: "Failed to fetch weather data" });
  }
});

module.exports = router;