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

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_DIR="${REPO_DIR:-$(dirname "$SCRIPT_DIR")}"
TRIGGER_FILE="${TRIGGER_FILE:-$REPO_DIR/deploy-trigger/redeploy.flag}"
POLL_INTERVAL="${POLL_INTERVAL:-10}"
# Compose service name from docker-compose.yml (not the generated image name).
SERVICE="${SERVICE:-portfolio}"
log() { echo "[deploy-watch] $(date -Iseconds) $*"; }

log "watching for $TRIGGER_FILE (repo: $REPO_DIR, service: $SERVICE, interval: ${POLL_INTERVAL}s)"

while true; do
  if [ -f "$TRIGGER_FILE" ]; then
    log "trigger detected, redeploying"
    rm -f "$TRIGGER_FILE"

    # set -e is ignored inside a subshell that is part of an && / || list, so
    # each step is chained explicitly to stop at the first failure.
    (
      cd "$REPO_DIR" &&
      git pull --ff-only &&
      docker compose build "$SERVICE" &&
      docker compose up -d "$SERVICE" &&
      docker image prune -f
    ) && log "redeploy complete" || log "redeploy FAILED, see output above"
  fi
  sleep "$POLL_INTERVAL"
done