# Setup Ruby environment: version managers (rbenv, chruby, rvm), Homebrew Ruby, and gem bin paths
_setup_ruby() {
    [ -n "$ZSH_VERSION" ] && setopt localoptions nonomatch nullglob

    _add_to_path() {
        [ -d "$1" ] || return 0
        case ":$PATH:" in
            *":$1:"*) ;;
            *) PATH="$1:$PATH"; export PATH ;;
        esac
    }

    _ruby_manager_active=0

    # 1. Check for rbenv (prefer managed Ruby)
    if [ -d "$HOME/.rbenv/bin" ]; then
        _add_to_path "$HOME/.rbenv/bin"
    fi
    if command -v rbenv >/dev/null 2>&1; then
        eval "$(rbenv init - 2>/dev/null)"
        _ruby_manager_active=1

        # Fast OpenSSL detection for ruby-build without calling slow `brew --prefix`
        if [ -z "$RUBY_CONFIGURE_OPTS" ]; then
            for _ssl_dir in \
                "/opt/homebrew/opt/openssl@3" \
                "/opt/homebrew/opt/openssl@1.1" \
                "/usr/local/opt/openssl@3" \
                "/usr/local/opt/openssl@1.1"
            do
                if [ -d "$_ssl_dir" ]; then
                    export RUBY_CONFIGURE_OPTS="--with-openssl-dir=$_ssl_dir"
                    break
                fi
            done
        fi
    fi

    # 2. Check for chruby
    if [ "$_ruby_manager_active" -eq 0 ]; then
        for _chruby_sh in \
            "/opt/homebrew/opt/chruby/share/chruby/chruby.sh" \
            "/usr/local/share/chruby/chruby.sh" \
            "/usr/share/chruby/chruby.sh"
        do
            if [ -r "$_chruby_sh" ]; then
                \. "$_chruby_sh"
                [ -r "${_chruby_sh%/*}/auto.sh" ] && \. "${_chruby_sh%/*}/auto.sh"
                _ruby_manager_active=1
                break
            fi
        done
    fi

    # 3. Check for RVM
    if [ "$_ruby_manager_active" -eq 0 ]; then
        if [ -s "$HOME/.rvm/scripts/rvm" ]; then
            \. "$HOME/.rvm/scripts/rvm"
            _ruby_manager_active=1
        fi
    fi

    # 4. If no version manager is active, fallback to Homebrew keg-only Ruby or standard locations
    # (Avoids Apple's deprecated /usr/bin/ruby on macOS when Homebrew Ruby is installed)
    if [ "$_ruby_manager_active" -eq 0 ]; then
        for _brew_ruby in $(
            for _r in /opt/homebrew/opt/ruby/bin \
                      /opt/homebrew/opt/ruby@*/bin \
                      /usr/local/opt/ruby/bin \
                      /usr/local/opt/ruby@*/bin; do
                [ -x "$_r/ruby" ] && echo "$_r"
            done | sort -V -r 2>/dev/null
        ); do
            _add_to_path "$_brew_ruby"
            break
        done
    fi

    # 5. Add user gem binaries to PATH (dynamically resolved, not hardcoded to a fixed version)
    if command -v ruby >/dev/null 2>&1; then
        _gem_user_bin="$(ruby -e 'puts Gem.user_dir' 2>/dev/null)/bin"
        if [ -n "$_gem_user_bin" ] && [ -d "$_gem_user_bin" ]; then
            _add_to_path "$_gem_user_bin"
        fi
        unset _gem_user_bin

        for _gbin in $(
            for _gd in "$HOME/.gem/ruby"/*/bin "$HOME/.local/share/gem/ruby"/*/bin; do
                [ -d "$_gd" ] && echo "$_gd"
            done | sort -V -r 2>/dev/null
        ); do
            _add_to_path "$_gbin"
            break
        done
    fi

    unset _ruby_manager_active
}
_setup_ruby
unset -f _setup_ruby _add_to_path