#!/usr/bin/env bash
set -euo pipefail

STACK_DIR="${STACK_DIR:-/opt/gitea}"
TARGET_VERSION="${TARGET_VERSION:?set TARGET_VERSION, e.g. TARGET_VERSION=1.26.2}"
GITEA_CONTAINER="${GITEA_CONTAINER:-gitea}"
APPLY="${APPLY:-0}"
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

cd "$STACK_DIR"

if [ ! -f docker-compose.yml ]; then
  echo "docker-compose.yml not found in $STACK_DIR" >&2
  exit 1
fi

echo "== Current version =="
docker exec -u git "$GITEA_CONTAINER" gitea --version || true

echo "== Creating backup first =="
"$SCRIPT_DIR/backup-gitea.sh"

echo "== Pulling target image =="
docker pull "gitea/gitea:$TARGET_VERSION"
docker run --rm --user git --entrypoint /usr/local/bin/gitea "gitea/gitea:$TARGET_VERSION" --version || true

OLD_IMAGE_ID="$(docker image inspect "$(docker inspect --format '{{.Config.Image}}' "$GITEA_CONTAINER")" --format '{{.Id}}' 2>/dev/null || true)"
if [ -n "$OLD_IMAGE_ID" ]; then
  ROLLBACK_TAG="gitea/gitea:rollback-$(date -u +%Y%m%d-%H%M%S)"
  docker tag "$OLD_IMAGE_ID" "$ROLLBACK_TAG"
  echo "Rollback image tag: $ROLLBACK_TAG"
fi

echo "== Pinning docker-compose.yml to target version =="
python3 - <<PY
from pathlib import Path
import re
p = Path('$STACK_DIR/docker-compose.yml')
s = p.read_text()
s2 = re.sub(r'image:\s*gitea/gitea:[^\s]+', 'image: gitea/gitea:$TARGET_VERSION', s, count=1)
if s2 == s:
    raise SystemExit('Could not find gitea/gitea image line to replace')
p.write_text(s2)
PY

docker compose config >/dev/null

if [ "$APPLY" != "1" ]; then
  echo "Dry-run complete. Compose file was pinned, but service was not recreated."
  echo "Review the diff, then run with APPLY=1 to recreate the Gitea service."
  exit 0
fi

echo "== Recreating Gitea service only =="
docker compose up -d server

echo "== Waiting for readiness =="
for _ in $(seq 1 90); do
  if curl -fsS "http://127.0.0.1:3001/api/v1/version" | grep -q "$TARGET_VERSION"; then
    echo
    echo "Gitea $TARGET_VERSION is ready."
    exit 0
  fi
  sleep 2
done

echo "Gitea did not report target version in time" >&2
exit 1