const express = require('express');
const sqlite3 = require('sqlite3');
const cors = require('cors');
const app = express();

app.use(cors());
app.use(express.json());

function getDb() {
  return new sqlite3.Database('db.sqlite', (err) => {
    if (err) console.log('db error:', err);
    console.log('Connected to database!');
  });
}

const db = getDb();
db.run(
  `CREATE TABLE IF NOT EXISTS appointments (
    id INTEGER PRIMARY KEY,
    date TEXT,
    time TEXT,
    name TEXT
)`,
  (err) => {
    console.log('Table creation error:', err);
  }
);
db.close();

app.post('/api/appointments', (req, res) => {
  const d = req.body;
  console.log('data:', d);

  const db = getDb();
  db.run(
    'INSERT INTO appointments (date, time, name) VALUES (?, ?, ?)',
    [d.date, d.time, d.name],
    function (err) {
      if (err) {
        console.log('error:', err);
        res.status(500).json({ msg: 'error' });
      } else {
        db.all('SELECT * FROM appointments', [], (err, rows) => {
          if (err) {
            console.log('error:', err);
            res.status(500).json({ msg: 'error' });
          } else {
            console.log('all data:', rows);
            res.json({ msg: 'ok', data: rows });
          }
          db.close();
        });
      }
    }
  );
});

app.get('/api/slots', (req, res) => {
  const db = getDb();

  db.all('SELECT * FROM appointments', [], (err, rows) => {
    let temp = [];
    for (let i = 28; i <= 29; i++) {
      for (let h = 13; h <= 17; h++) {
        for (let m = 0; m < 60; m += 30) {
          let d = `2024-02-${i}`;
          let t = `${h}:${m === 0 ? '00' : m}`;
          temp.push({ date: d, time: t });
        }
      }
    }
    for (let i = 1; i <= 3; i++) {
      for (let h = 13; h <= 17; h++) {
        for (let m = 0; m < 60; m += 30) {
          let d = `2024-03-0${i}`;
          let t = `${h}:${m === 0 ? '00' : m}`;
          temp.push({ date: d, time: t });
        }
      }
    }

    let available = temp.filter((slot) => {
      return !rows.some((r) => r.date === slot.date && r.time === slot.time);
    });

    console.log('available slots:', available);
    res.json(available);
    db.close();
  });
});

app.get('/api/appointments', (req, res) => {
  const db = getDb();
  db.all('SELECT * FROM appointments', [], (err, rows) => {
    if (err) {
      console.log('error:', err);
      res.status(500).json({ msg: 'error' });
    } else {
      console.log('all appointments:', rows);
      res.json(rows);
    }
    db.close();
  });
});

app.listen(3000, () => console.log('Server running at http://localhost:3000'));