#!/bin/sh
# script/bootstrap: install all dependencies needed to build and develop
# this repo, idempotently. Assumes nothing is present (not git, make, or
# go). Base tooling comes from nix, apt, brew, or apk (detected in that
# order; apt runs noninteractive). golangci-lint is deliberately not
# installed: linting runs only in docker, via script/lint and the
# Dockerfile lint phase.
set -eu

ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"

PKGMGR=""
SUDO=""

detect_pkgmgr() {
	[ -n "$PKGMGR" ] && return 0
	if command -v nix-env >/dev/null 2>&1; then
		PKGMGR="nix"
	elif command -v apt-get >/dev/null 2>&1; then
		PKGMGR="apt"
	elif command -v brew >/dev/null 2>&1; then
		PKGMGR="brew"
	elif command -v apk >/dev/null 2>&1; then
		PKGMGR="apk"
	else
		echo "bootstrap: no supported package manager (nix, apt, brew, apk)" >&2
		exit 1
	fi
	if [ "$PKGMGR" = "apt" ]; then
		export DEBIAN_FRONTEND=noninteractive
		if [ "$(id -u)" != "0" ]; then
			SUDO="sudo"
		fi
	fi
}

# pkg_install <nix-attr> <apt-pkg> <brew-formula> <apk-pkg>
pkg_install() {
	detect_pkgmgr
	case "$PKGMGR" in
	nix) nix-env -iA "nixpkgs.$1" ;;
	apt) $SUDO env DEBIAN_FRONTEND=noninteractive apt-get install -y "$2" ;;
	brew) brew install "$3" ;;
	apk) apk add --no-cache "$4" ;;
	esac
}

missing() {
	! command -v "$1" >/dev/null 2>&1
}

main() {
	cd "$ROOT"

	if missing git; then pkg_install git git git git; fi
	if missing make; then pkg_install gnumake make make make; fi
	if missing go; then pkg_install go golang go go; fi

	# docker is platform-specific and out of scope for a package-manager
	# bootstrap, but script/lint and script/test need it.
	if missing docker; then
		echo "bootstrap: docker not found; script/lint and script/test require it" >&2
	fi

	go mod download

	echo "bootstrap complete"
}

main "$@"
