# For Mac with M1 processor

## Install Homebrew
which brew >/dev/null 2>/dev/null
if [ $? -ne 0 ]; then
    /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
    if [ "$(uname -a | sed 's/ /\n/g' | tail -n1)" = "arm64" ]; then
        echo 'if [ "$(uname -a | sed '\''s/ /\n/g'\'' | tail -n1)" = "arm64" ]; then' >> /Users/$USER/.zprofile
        echo '    eval $(/opt/homebrew/bin/brew shellenv)' >> /Users/$USER/.zprofile
        echo 'fi' >> /Users/$USER/.zprofile
        source /Users/$USER/.zprofile
    fi
fi


## Check installing homebrew
if [ `which brew >/dev/null 2>/dev/null; echo $?` -ne 0 ]; then
    echo "Homebrew is not installed." 1>&2
    exit 1
fi

# For Homebrew

GCC_VERSION="11"

TARGET_PACKAGES=(wget emacs gcc@${GCC_VERSION})
CHECKED_PACKAGES=(wget emacs gcc gfortran)
check_flag=1

## Check installing homebrew
if [ `which brew >/dev/null 2>/dev/null; echo $?` -ne 0 ]; then
    echo "Homebrew is not installed." 1>&2
    exit 1
fi

BREW_ROOT=`brew --prefix`

## Install each package
echo "Install packages"
for package in ${TARGET_PACKAGES[@]}; do
    echo ${package}
done
for package in ${TARGET_PACKAGES[@]}; do
    brew install ${package}
done


## Use GCC instead of Clang
if [ -f "${BREW_ROOT}/bin/gcc" ]; then
    rm "${BREW_ROOT}/bin/gcc"
fi	
ln -s ${BREW_ROOT}/bin/gcc-${GCC_VERSION} ${BREW_ROOT}/bin/gcc
if [ $? -ne 0 ]; then
    echo "Symbolic link of GCC cannot be created." 1>&2
    exit 1
fi
if [ "`readlink ${BREW_ROOT}/bin/gcc`" != "${BREW_ROOT}/bin/gcc-${GCC_VERSION}" ]; then
    echo "gcc command may use Clang or default GCC instead of GCC installed by Homebrew." 1>&2
fi


## Check whether each packages is installed or not.
echo ""
echo ""
echo "Check packages"
for package in ${CHECKED_PACKAGES[@]}; do
    ${package} --version >/dev/null 2>/dev/null
    if [ $? -ne 0 ]; then
        echo "${package} is not installed." 1>&2
        check_flag=0
    fi
done

echo ""
if [ ${check_flag} -eq 1 ]; then
    echo "Completed!"
else
    echo "Some packages are not installed correctly."
fi