#!/usr/bin/env bash

# Require root to install it.
if [[ "$(whoami)" != "root" ]]; then
  echo "Please rerun this installer as root." >&2
  exit 1
fi

# Check for the presence of git.
if ! command -v git >/dev/null 2>&1 ; then
  echo "Please ensure git is installed and available in PATH to continue." >&2
  exit 1
fi

# Load the rvm config.
if [[ -z "$rvm_ignore_rvmrc" ]]; then
  [[ -s /etc/rvmrc ]] && source /etc/rvmrc
  [[ -s "$HOME/.rvmrc" ]] && source "$HOME/.rvmrc"
fi

rvm_path="${rvm_path:-"/usr/local/rvm"}"
export rvm_selfcontained=0

mkdir -p "$rvm_path/src/"
builtin cd "$rvm_path/src"

rm -rf ./rvm/

git clone --depth 1 git://github.com/wayneeseguin/rvm.git || git clone http://github.com/wayneeseguin/rvm.git

builtin cd rvm

echo "Running the install script."
bash ./scripts/install "$@"

rvm_group_name="${rvm_group_name:-"rvm"}"

if cat /etc/group | cut -d: -f1 | grep -q "^${rvm_group_name}$"; then
  echo "Group exists, proceeding with installation."
else
  echo "Creating the group '$rvm_group_name'"
  groupadd -f "$rvm_group_name"
fi
echo "Adding root the '$rvm_group_name'"
usermod -a -G "$rvm_group_name" "$(whoami)"

echo "Setting up group permissions"
for dir in rvm bin share/man; do
  chown -R root:"$rvm_group_name" /usr/local/$dir
  chmod -R g+w /usr/local/$dir
done; unset dir

echo "Generating system wide rvmrc"
rm -f /etc/rvmrc
touch /etc/rvmrc
cat > /etc/rvmrc <<END_OF_RVMRC
# Setup default configuration for rvm.
umask g+w
export rvm_selfcontained=0
export rvm_prefix="/usr/local/"
END_OF_RVMRC

echo "Generating /usr/local/lib/rvm to load rvm"
rm -f /usr/local/lib/rvm
touch /usr/local/lib/rvm
cat > /usr/local/lib/rvm <<END_OF_RVM_SH
# Automatically source rvm
if [[ -s "\$HOME/.rvm/scripts/rvm" ]]; then
  source "\$HOME/.rvm/scripts/rvm"
elif [[ -s "/usr/local/rvm/scripts/rvm" ]]; then
  source "/usr/local/rvm/scripts/rvm"
fi
END_OF_RVM_SH

echo "Correct permissions on rvmrc and the rvm loader"
# Finally, ensure the rvmrc is owned by the group.
for file in /etc/rvmrc /usr/local/lib/rvm ; do
  chown root:"$rvm_group_name" "$file"
  chmod g+w "$file"
done; unset file

echo "To use, source '/usr/local/lib/rvm' to your shell profile."