#!/usr/bin/env bash
# Builds the three images for the checked-out commit, runs the checks, and
# restarts the stack on it. If the new containers don't come up healthy, the
# stack goes back to the last good tag. Run from the repo root on Cosmos, by the
# deploy timer (pull-and-deploy.sh) or by hand. See docs/deploy.md.
set -euo pipefail

STACK="${GK_STACK_DIR:-/home/greg/homelab/gregkilmer}"
ENV_FILE="$STACK/.env"
TAG="$(git rev-parse --short=12 HEAD)"
compose() { docker compose --project-directory "$STACK" -f "$STACK/compose.yaml" "$@"; }
setting() { grep -E "^$1=" "$ENV_FILE" | tail -n 1 | cut -d= -f2- || true; }
set_setting() {
  if grep -qE "^$1=" "$ENV_FILE"; then sed -i "s|^$1=.*|$1=$2|" "$ENV_FILE"; else echo "$1=$2" >> "$ENV_FILE"; fi
}

for f in .env content.env admin.env site.env; do
  [ -f "$STACK/$f" ] || { echo "Missing $STACK/$f (see docs/deploy.md)"; exit 1; }
done

CURRENT="$(setting GK_TAG)"
PREVIOUS="$(setting GK_PREVIOUS_TAG)"
if [ "$CURRENT" = "$TAG" ] && [ "${FORCE:-}" != "1" ]; then
  echo "Already running $TAG; nothing to do (FORCE=1 to rebuild)."
  exit 0
fi

echo "== Checks"
docker build --target check .

echo "== Images for $TAG"
for t in content admin site; do
  docker build --target "$t" -t "gregkilmer/$t:$TAG" .
done

echo "== Deploy"
mkdir -p "$STACK/data/content"
cp deploy/compose.yaml "$STACK/compose.yaml"
set_setting GK_TAG "$TAG"
[ -n "$CURRENT" ] && set_setting GK_PREVIOUS_TAG "$CURRENT"

# No --remove-orphans: another stack may share the project name, and its
# containers must never be touched by this deploy.
if ! compose up -d --wait --wait-timeout 120; then
  echo "!! $TAG did not come up healthy"
  compose ps
  compose logs --tail 50 || true
  if [ -n "$CURRENT" ]; then
    echo "== Rolling back to $CURRENT"
    set_setting GK_TAG "$CURRENT"
    set_setting GK_PREVIOUS_TAG "$PREVIOUS"
    compose up -d --wait --wait-timeout 120
  fi
  exit 1
fi

echo "== Prune old images (keeping $TAG and ${CURRENT:-none})"
for t in content admin site; do
  docker images "gregkilmer/$t" --format '{{.Tag}}' | while read -r old; do
    [ "$old" = "$TAG" ] || [ "$old" = "$CURRENT" ] || docker rmi "gregkilmer/$t:$old" >/dev/null || true
  done
done
echo "Deployed $TAG"