#!/usr/bin/env bash

# Unofficial Bash Strict Mode
set -euo pipefail
IFS='
'

FILENAME="student/auto-exec-bin.sh"
BINFILE="~/myBins/01exec"
script_dirS=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd)

setupbin() {
    if [ -f ${BINFILE} ]; then
        echo "bin already exists!"
    else
        mkdir -p ~/myBins
        echo "echo Hello 01 Scripting Pool" > $HOME/myBins/01exec
    fi
    chmod +x $HOME/myBins/01exec
}

challenge() {
    OLD_PATH=$PATH
    # run soultion script
    source "$script_dirS"/$FILENAME
	submitted=$(cd / && 01exec)

    PATH=$OLD_PATH
    # run student script
	source "$script_dirS"/solutions/auto-exec-bin.sh
	expected=$(cd / && 01exec)

    # diff
	diff <(echo "$submitted") <(echo "$expected")
}

# True if FILE exists and is a regular file
if [ -f ${FILENAME} ]; then
    # FILE exists and it's not empty
    if [ -s ${FILENAME} ]; then
        if [[ $(cat $FILENAME | grep echo | wc -l) -ne 0 ]]; then
            echo "echo is not allowed in this exercise!"
            exit 1
        fi
        setupbin
        challenge
    else
        echo "The file exist but is empty"
        exit 1
    fi
else
    echo "File does not exist"
    exit 1
fi