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

# ── usage ─────────────────────────────────────────────────────────────────────
usage() {
  echo "Usage: $0 <runner-name>"
  echo "  runner-name: runner-node-1 | runner-node-2 | runner-node-3"
  exit 1
}

[[ $# -ne 1 ]] && usage

RUNNER_NAME="$1"

# validate
case "$RUNNER_NAME" in
  runner-node-1|runner-node-2|runner-node-3) ;;
  *) echo "ERROR: unknown runner name '$RUNNER_NAME'"; usage ;;
esac

# ── config ────────────────────────────────────────────────────────────────────
CACHE_PORT=8088
GITEA_URL="https://gitea.kalekber.cc/"
REGISTRATION_TOKEN="AboxpDKWx7gizwJ9xeheHVqKjj9J9N9BgyX96wvu"
IMAGE="docker.io/gitea/act_runner:latest"
DATA_DIR="$PWD/data/$RUNNER_NAME"
CFG_PATH="$DATA_DIR/config.yaml"

# ── detect THIS machine's LAN IP ──────────────────────────────────────────────
HOST_IP=$(ip route get 1.1.1.1 | awk '{for(i=1;i<=NF;i++) if($i=="src") print $(i+1); exit}')
if [[ -z "$HOST_IP" ]]; then
  echo "ERROR: could not detect host LAN IP" >&2
  exit 1
fi
echo "Host LAN IP: $HOST_IP"

# ── generate config.yaml ──────────────────────────────────────────────────────
mkdir -p "$DATA_DIR"

docker run --rm --entrypoint="" "$IMAGE" \
  act_runner generate-config > "$CFG_PATH"

awk -v host="$HOST_IP" -v port="$CACHE_PORT" '
  /^cache:/ { in_cache=1 }
  in_cache && /enabled:/ { $0 = "  enabled: true" }
  in_cache && /dir:/     { $0 = "  dir: \"/data/cache\"" }
  in_cache && /host:/    { $0 = "  host: \"" host "\"" }
  in_cache && /port:/    { $0 = "  port: " port; in_cache=0 }
  { print }
' "$CFG_PATH" > "${CFG_PATH}.tmp" && mv "${CFG_PATH}.tmp" "$CFG_PATH"

echo "Config written to $CFG_PATH (cache $HOST_IP:$CACHE_PORT)"

# ── stop + remove old container if exists ────────────────────────────────────
if docker inspect "$RUNNER_NAME" &>/dev/null; then
  echo "Removing existing $RUNNER_NAME..."
  docker stop "$RUNNER_NAME" || true
  docker rm   "$RUNNER_NAME" || true
fi

# ── start runner ──────────────────────────────────────────────────────────────
docker run \
  -v "$DATA_DIR:/data" \
  -v "$CFG_PATH:/config.yaml" \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -e CONFIG_FILE=/config.yaml \
  -e GITEA_INSTANCE_URL="$GITEA_URL" \
  -e GITEA_RUNNER_REGISTRATION_TOKEN="$REGISTRATION_TOKEN" \
  -e GITEA_RUNNER_NAME="$RUNNER_NAME" \
  -p "${CACHE_PORT}:${CACHE_PORT}" \
  --restart unless-stopped \
  --name "$RUNNER_NAME" \
  -d "$IMAGE"

echo "Runner $RUNNER_NAME started"
docker ps --filter "name=$RUNNER_NAME" --format "table {{.Names}}\t{{.Status}}\t{{.Ports}}"