const configuredLimit = parseInt(process.env.MAX_REQUESTS_PER_DAY, 10)
const MAX_REQUESTS_PER_DAY = Number.isFinite(configuredLimit) && configuredLimit > 0
  ? configuredLimit
  : Infinity

const userCounts = new Map()
let currentDate = new Date().toDateString()

function resetIfNeeded() {
  const today = new Date().toDateString()
  if (today !== currentDate) {
    userCounts.clear()
    currentDate = today
    console.log('Rate limiter: daily counters reset')
  }
}

function checkLimit(userId) {
  resetIfNeeded()
  const count = userCounts.get(userId) || 0
  return {
    allowed: count < MAX_REQUESTS_PER_DAY,
    count,
    max: MAX_REQUESTS_PER_DAY
  }
}

function increment(userId) {
  resetIfNeeded()
  const count = (userCounts.get(userId) || 0) + 1
  userCounts.set(userId, count)
  return count
}

module.exports = { checkLimit, increment, MAX_REQUESTS_PER_DAY }