import express from 'express'
import cors from 'cors'
import dotenv from 'dotenv'
import { pool } from './db.js'
import fs from 'fs'
import path from 'path'

dotenv.config()

const app = express()
app.use(cors())
app.use(express.json())

// Simple health
app.get('/api/health', (req, res) => res.json({ ok: true }))

// List available cargobikes
app.get('/api/bikes', async (req, res) => {
  // fixed bike types
  const bikes = [1000, 2000, 3000, 4000, 5000]
  res.json({ bikes })
})

// Create a booking
app.post('/api/bookings', async (req, res) => {
  try {
    const { bike_type, start_date, end_date, name, email } = req.body
    if (!bike_type || !start_date || !end_date || !name || !email) {
      return res.status(400).json({ error: 'Missing fields' })
    }

    const text = `INSERT INTO bookings(bike_type, start_date, end_date, name, email) VALUES($1, $2, $3, $4, $5) RETURNING *`
    const values = [bike_type, start_date, end_date, name, email]
    const result = await pool.query(text, values)
    res.status(201).json({ booking: result.rows[0] })
  } catch (err) {
    console.error(err)
    res.status(500).json({ error: 'Server error' })
  }
})

// List bookings (simple)
app.get('/api/bookings', async (req, res) => {
  try {
    const result = await pool.query('SELECT * FROM bookings ORDER BY created_at DESC LIMIT 100')
    res.json({ bookings: result.rows })
  } catch (err) {
    console.error(err)
    res.status(500).json({ error: 'Server error' })
  }
})

// --- ensure DB tables exist (auto-migration for dev) ---
async function ensureTables() {
  const createSql = `
    CREATE TABLE IF NOT EXISTS bookings (
      id SERIAL PRIMARY KEY,
      bike_type INTEGER NOT NULL,
      start_date DATE NOT NULL,
      end_date DATE NOT NULL,
      name TEXT NOT NULL,
      email TEXT NOT NULL,
      created_at TIMESTAMP WITH TIME ZONE DEFAULT now()
    );
  `

  try {
    await pool.query(createSql)
    console.log('Database: bookings table is present (created if it did not exist)')
  } catch (err) {
    // If DATABASE_URL is not configured or DB not reachable, warn but still allow server to start for frontend dev
    console.warn('Warning: could not ensure bookings table (DB may be unavailable).', err.message)
  }
}

const port = process.env.PORT || 3000

// Run migrations (if possible) then start server
;(async () => {
  await ensureTables()
  app.listen(port, () => console.log(`Backend listening on port ${port}`))
})()