#!/bin/bash

maxDepth=4
garbagedir="output"

expr=(".jpg" ".png" ".doc" ".xls" ".html" ".sh" ".pdf" ".php" ".txt" ".lib" ".dll")

function randNumber(){

    if [ ! "$1" ]; then
        min=1
    else
        min=$1
    fi

    if [ ! "$2" ]; then
        max=25
    else
        max=$2
    fi

    local myresult=`shuf -i $min-$max -n 1`
    echo "$myresult"
}

function randString(){
    local myresult=`echo $RANDOM | md5sum | awk '{print $1}'`
    echo "${myresult:5:5}"
}

function fillFile(){
    local myresult=$(randString)
    for i in $(seq 1 $(randNumber 7 20))
    do
        myresult="$myresult"$(randString)
    done

    echo "$myresult"
}

function filldir(){
    local basedir="$1"
    local depth="$2"

    #Generate dirs
    for i in $(seq 1 $(randNumber))
    do

        #Generate files in directory
        for i in $(seq 1 $(randNumber 7 20))
        do
            expr_index=$(randNumber 1 ${#expr[@]})
            expr_index=$[expr_index-1]
            echo $(fillFile) > "$basedir/"$(randString)"${expr[$expr_index]}"
        done

        #If loop reach  limit
        if [ "$depth" == "$maxDepth" ]; then
            return
        else
            local dir="$basedir/"$(randString)
            mkdir "$dir"

            depth=$[depth+1]

            echo "$depth:$dir"

            filldir "$dir" "$depth"
        fi
    done
}

mkdir "$garbagedir"
filldir "$garbagedir" 0