#!/bin/bash

num=$1

echo "$num" | grep -q "^[1-9][0-9]\{,4\}$" || {
    echo "Err: no valid number given" >&2
    exit 1
}

parent=$((num / 100))
pdir="solutions/${parent}/q${num}"
sol_file="${pdir}/solution.go"

if [ -f "$sol_file" ]; then
    exit 0
fi

echo "Creating template for question No. $num" >&2
mkdir -pv "$pdir"
echo "package q$num" > "$sol_file"
echo "Created $sol_file"