#!/usr/bin/env bash
#
# The Great Bear deploy — push the current commit, build it with podman, and
# install the Quadlet unit on emily with ansible.
#
# The image is built from the committed tree (`git archive HEAD`) and tagged
# with its commit id, so what runs on the host is exactly what git knows about.
#
#   ./deploy.sh              deploy HEAD (tracked tree must be clean and pushed)
#   ./deploy.sh --force      skip the guards (know what you are doing)
#   ./deploy.sh --no-push    skip the push, if you already pushed
#
# Log in to the registry once beforehand: podman login registry.tanshu.com
set -euo pipefail
cd "$(dirname "${BASH_SOURCE[0]}")"

BRANCH="${BRANCH:-main}"

FORCE=false
NO_PUSH=false
for arg in "$@"; do
	case "$arg" in
	--force) FORCE=true ;;
	--no-push) NO_PUSH=true ;;
	*)
		echo "Usage: $0 [--force] [--no-push]" >&2
		exit 1
		;;
	esac
done

# The build takes HEAD, so push first: otherwise the registry collects an image
# for a commit that exists only on this machine.
if [ "$NO_PUSH" != true ]; then
	echo "==> pushing"
	git push
fi

# Guards. Only tracked-file state matters — untracked and ignored files never
# enter a `git archive HEAD` build. HEAD must match origin/$BRANCH so the commit
# the image is tagged with is one the remote actually has.
if [ "$FORCE" != true ]; then
	if [ -n "$(git status --porcelain --untracked-files=no)" ]; then
		echo "x tracked files modified - commit or stash first (or --force)" >&2
		exit 1
	fi
	git fetch origin --quiet
	if [ "$(git rev-parse HEAD)" != "$(git rev-parse "origin/$BRANCH")" ]; then
		echo "x HEAD != origin/$BRANCH - push or pull first (or --force)" >&2
		exit 1
	fi
fi

TAG=$(git rev-parse --short HEAD)
echo "==> deploying commit $TAG"

echo "========================================================"
echo " Building & Uploading Container Image (Podman)"
echo "========================================================"
make build-production COMMIT="$TAG"

echo ""
echo "========================================================"
echo " Executing Ansible Deployment"
echo "========================================================"
# The play configures rootless Podman Quadlet units that belong to the
# connecting user, so it must connect as that user and must NOT become root.
# `-u` is the account that owns ~/.config/containers/systemd on the target.
deploy_user="${ANSIBLE_USER:-tanshu}"
cd ansible || exit
# image_tag pins the exact commit; rollback is -e image_tag=<older-commit>.
ansible-playbook -u "$deploy_user" playbook.yml -e "image_tag=$TAG"