#!/bin/bash
RANDOM_NUM=0
ATTEMPTS_NUM=7
POOL_NUM=100
RE='^[0-9]+$'

usage ()
{
  echo "Usage: ./guess_number.sh -p 50 -a 30"
  echo ""
  echo "PARAMETERS"
  echo "    -h (Show this help prompt)"
  echo "    -a $ (set the amount of available attempts)"
  echo "    -p $ (set the amount of numbers that will be generated)"
  exit
}

while getopts a:p:h flag; do
  case "${flag}" in
    a) ATTEMPTS_NUM=${OPTARG};;
    p) POOL_NUM=${OPTARG};;
    h) usage;;
  esac
done

status() {
  clear
  cat <<'END_CAT'
 ______________
< Buena suerte >
 --------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||
END_CAT
  echo "Intenta adivinar el número entre 0 y $POOL_NUM!"
  echo "Intentos restantes: $ATTEMPTS_NUM"
}

checkWin() {
  if [[ "$1" == "$RANDOM_NUM" ]]; then
    echo "Enhorabuena! El número era $RANDOM_NUM!"
    exit
  fi

  if [[ "$1" != "$RANDOM_NUM" ]]; then
    if [[ $1 -gt $RANDOM_NUM ]]; then
      echo "El número es demasiado alto!"
      ATTEMPTS_NUM=$((ATTEMPTS_NUM - 1))
      return 0
    fi
    if [[ $1 -lt $RANDOM_NUM ]]; then
      echo "El número es demasiado bajo!"
      ATTEMPTS_NUM=$((ATTEMPTS_NUM - 1))
      return 0
    fi
  fi
}

checkLose() {
  if [[ $ATTEMPTS_NUM == 0 ]]; then
    echo "Pierdes! El número era $RANDOM_NUM :/"
    exit
  fi
}

main() {
  RANDOM_NUM=$(seq 0 $POOL_NUM | tr " " "\n" | shuf -n1)
  for (( ; ; )); do

    status
    checkLose


    num_attempt="-1"
    while [[ ! $num_attempt =~ $RE || $num_attempt > $POOL_NUM ]]; do
      read -p "Número: " num_attempt
    done

    checkWin $num_attempt
    read -p "Pulse enter para continuar: "
  done
}

main