#!/bin/bash

CHARS="abcdefghijklmnopqrstuvwxyz0123456789_ .-,@:;()%\$!{}[]=*+#°§ēģ"
FIRST_CHARS="abcdefghijklmnopqrstuvwxyz0123456789_"
BASE_DIR="source"

((DIR_LEVELS=$RANDOM%5))
((DIR_COUNT=$RANDOM%50))
((FILES_PER_DIRECTORY=$RANDOM%50))

export CHARS FIRST_CHARS DIR_LEVELS DIR_COUNT FILES_PER_DIRECTORY BASE_DIR

randfirstchar() {
        local idx
        ((idx=$RANDOM%${#FIRST_CHARS}))
        echo "${FIRST_CHARS:$idx:1}"

}

randchar() {
        local idx
        ((idx=$RANDOM%${#CHARS}))
        echo "${CHARS:$idx:1}"

}

mk_token() {
        local length
        local token=""
        ((length=$RANDOM % 20 + 4))
        token=$(randfirstchar)
        for((i=1;i<=$length;i++));do
                token="$token$(randchar)"
        done
        echo "$token"
}

mk_content() {

        local dir_levels="$1"
        local files_per_directory="$2"
        local new_dir="$(mk_token)"
        local i

        if [ $dir_levels -gt 0 ] ;then
                mkdir "$new_dir"
                cd "$new_dir"
                mk_content $((dir_levels - 1)) $files_per_directory
                cd ..
        fi
        for ((i=1;i<=$files_per_directory;i++));do
                touch "$(mk_token)"
        done

}

main() {
        cd "$BASE_DIR"
        local a b c
        local current_dir

        for((a=1;a<$DIR_COUNT;a++));do
                mk_content $DIR_LEVELS $FILES_PER_DIRECTORY
        done
}

main