#!/bin/bash

USAGE="$0 ROOT FOLDERS FILES FILENAMES INTEGERS USER DIR :\
\n\tgenerate a semi-random seed in the DIR folder, which can be then used to \n\
\trandomize exercises.\n\
Parameters:\n\
\tROOT : the folder in which to find folders, files, ... Usually, the student's\n\
\thome directory.\n\
\tFOLDERS : how many random folders to pick \n\
\tFILES : how many random files to pick\n\
\tFILENAMES : how many random filenames to pick from the dictionnary haddock.list\n\
\tINTEGERS : how many random integers to pick\n\
\tUSER : username of the student\n\
\tDIR : folder in which to store the generated seeds"

if [[ $# != 7 ]] ; then echo -e $USAGE ; exit 0 ; fi

# This users home
root=$1

# How many random folders, files, filenames and integers you need
folders=$2
files=$3
filenames=$4
ints=$5

# username
USER=$6

# Seeds storage
DIR=$7

if echo $DIR | grep -v /$ > /dev/null ; then DIR=$DIR/ ; fi

mkdir -p $DIR$USER ; 

if [[ ! -s $DIR$USER/folders.seed ]] ; then
    find $root -type d | shuf | head -n $folders > $DIR$USER/folders.seed
    echo folders
fi

if [[ ! -s $DIR$USER/files.seed ]] ; then
    find $root -type f | shuf | head -n $files > $DIR$USER/files.seed
    echo files
fi

if [[ ! -s $DIR$USER/filenames.seed ]] ; then
    cat haddock.list | shuf | head -n $filenames > $DIR$USER/filenames.seed
    echo names
fi

if [[ ! -s $DIR$USER/ints.seed ]] ; then 
    for i in $(seq 1 $ints) ; do
        echo $((3 + $RANDOM % 13)) >> $DIR$USER/ints.seed
    done
    echo ints
fi