const express = require('express')
const session = require('express-session')
const fs = require('fs')
const path = require('path')
const morgan = require('morgan')
const bodyParser = require('body-parser')
const sqlite3 = require('sqlite3').verbose()
const bole = require('bole')

const config = require('./config')

const log = bole('app')
const app = express()

// Create an SQLite database and initialize tables
const db = new sqlite3.Database(config.db_path, (err) => {
  if (err) {
    log.error('Error opening SQLite database:', err.message)
  } else {
    log.info('Connected to SQLite database', config.db_path)
    db.run(`
            CREATE TABLE IF NOT EXISTS button_clicks (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                session_id TEXT,
                animal_name TEXT,
                button_name TEXT,
                timestamp DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
                time_difference INTEGER  -- Add this column for time difference
            )
        `)
    db.run(`
            CREATE TABLE IF NOT EXISTS animals (
              id INTEGER PRIMARY KEY AUTOINCREMENT,
              name TEXT NOT NULL UNIQUE,
              timestamp DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL
              )
        `)
  }
})

if (config.PRODUCTION) {
  let accessLogStream = fs.createWriteStream(
    path.join(__dirname, 'log', 'access.log'),
    { flags: 'a' }
  )
  app.use(morgan('combined', { stream: accessLogStream }))
} else {
  app.use(morgan('combined'))
}

app.use(bodyParser.json())
app.use(session({
  resave: false,
  saveUninitialized: false,
  cookie: { maxAge: 3600000 },
  secret: config.session_token
}))

let animals
// check and load animals into redis
try {
  fs.readFile('./animals.json', function (err, data) {
    if (err) {
      throw err
    }
    const jsondata = JSON.parse(data)
    animals = jsondata.animals
    for (const animal of animals) {
      db.run(`
              INSERT INTO animals(name)
                SELECT ?
                WHERE NOT EXISTS(SELECT 1 FROM animals WHERE name = ?);
      `,
      [animal, animal],
      (err) => {
        if (err) {
          log.error(`Error inserting animal ${animal}: `, err.message)
        } else {
          log.info(`Success inserting animal ${animal}`)
        }
      }
      )
    }
  })
} catch (error) {
  log.error('Error loading animals:', error)
  animals = ['Dog', 'Cat', 'Elephant', 'Lion', 'Giraffe']
}

// Serve the HTML file
app.get('/', (req, res) => {
  res.sendFile(path.join(__dirname, 'index.html'))
})
app.get('/asset/frontend.js', (req, res) => {
  res.sendFile(path.join(__dirname, 'asset/frontend.js'))
})

app.get('/newSession', (req, res) => {
  log.info(req.session.id)
  req.session.regenerate((error) => {
    if (error) {
      log.error(error)
    }
  })
  log.info(req.session.id)
})

// Route to get a random animal name
app.get('/getNextAnimal', async (req, res) => {
  try {
    // TODO this is currently random, and should have a bit of reasoning behind the next choice
    const randomIndex = Math.floor(Math.random() * animals.length)
    const randomAnimal = animals[randomIndex]
    res.json({ animalName: randomAnimal })
  } catch (error) {
    log.error('Error fetching random animal:', error)
    res.status(500).json({ error: 'Internal server error' })
  }
})

// Route to record button clicks along with session IDs in SQLite
app.post('/recordButtonClick', (req, res) => {
  try {
    // const { buttonName, sessionId } = req.body;
    const result = req.body
    db.run(
      'INSERT INTO button_clicks (session_id, animal_name, button_name, timestamp, time_difference) VALUES (?, ?, ?, ?, ?)',
      [
        req.session.id,
        result.animal,
        result.button,
        result.time,
        result.difference
      ],
      (err) => {
        if (err) {
          log.error('Error recording button click:', err.message)
          res.status(500).json({ error: 'Internal server error' })
        } else {
          res.sendStatus(200)
        }
      }
    )
  } catch (error) {
    log.error('Error recording button click:', error)
    res.status(500).json({ error: 'Internal server error' })
  }
})

// Route to show the current results from SQLite
app.get('/results', async (req, res) => {
  try {
    const results = {
      count: {},
      avgTimes: {}
    }
    const getCount = new Promise((resolve, reject) => {
      db.all(
        `
          SELECT animal_name, button_name, COUNT(*) AS count
          FROM button_clicks
          GROUP BY button_name, animal_name
        `,
        (err, rows) => {
          if (err) {
            reject(new Error('getCount: ' + err.message))
          } else {
            rows.forEach((row) => {
              if (typeof results.count[row.animal_name] === 'undefined') {
                results.count[row.animal_name] = {}
              }
              results.count[row.animal_name][row.button_name] = row.count
            })
            resolve()
          }
        }
      )
    })
    const getAvgTime = new Promise((resolve, reject) => {
      db.all(
        `
            SELECT animal_name, button_name, AVG(time_difference) AS time
            FROM button_clicks
            GROUP BY animal_name, button_name;
        `,
        (err, rows) => {
          if (err) {
            reject(new Error('getAvgTime: ' + err.message))
          } else {
            rows.forEach((row) => {
              if (typeof results.avgTimes[row.animal_name] === 'undefined') {
                results.avgTimes[row.animal_name] = {}
              }
              results.avgTimes[row.animal_name][row.button_name] = row.time
            })
            resolve()
          }
        }
      )
    })
    const getTotalAvgTime = new Promise((resolve, reject) => {
      db.all(
        `
            SELECT animal_name, AVG(time_difference) AS time
            FROM button_clicks
            GROUP BY animal_name;
        `,
        (err, rows) => {
          if (err) {
            reject(new Error('getTotalAvgTime: ' + err.message))
          } else {
            rows.forEach((row) => {
              if (typeof results.avgTimes[row.animal_name] === 'undefined') {
                results.avgTimes[row.animal_name] = {}
              }
              results.avgTimes[row.animal_name].total = row.time
            })
            resolve()
          }
        }
      )
    })
    await Promise.all([getCount, getTotalAvgTime, getAvgTime])
    res.json(results)
  } catch (error) {
    log.error('Error fetching results:', error)
    res.status(500).json({ error: 'Internal server error' })
  }
})

module.exports = app

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