#!/bin/bash
# Compare deployed container versions against local git HEAD
# Warns if containers are stale (built from an older commit)
#
# Usage:
#   ./scripts/build-check.sh
#
# What it shows:
#   - Local git HEAD commit SHA
#   - Each container's built commit SHA (from Docker labels)
#   - Whether containers are up-to-date or stale
#   - Warnings if labels are missing (pre-07-02 containers)
#
# Label fields read:
#   - org.opencontainers.image.revision = Git commit SHA embedded by deploy.sh
#   - org.opencontainers.image.created = Build timestamp (ISO 8601 format)
#
# Exit codes:
#   0 = All containers up to date
#   1+ = Warnings or stale containers detected
#
# See: /docs/DEPLOYMENT.md for troubleshooting

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_DIR="$(dirname "$SCRIPT_DIR")"

cd "$REPO_DIR"

LOCAL_COMMIT=$(git rev-parse HEAD)
echo "Local HEAD: $(git rev-parse --short HEAD) ($LOCAL_COMMIT)"
echo ""

# Check a single container's build status
# Args: $1 = container name
check() {
  local name="$1"

  # Container not running
  if ! docker inspect "$name" &>/dev/null; then
    echo "[$name] Not running"
    return
  fi

  # Read Docker labels set by deploy.sh
  # If labels are missing, container was built before phase 07-02
  local commit date
  commit=$(docker inspect "$name" --format '{{index .Config.Labels "org.opencontainers.image.revision"}}' 2>/dev/null)
  date=$(docker inspect "$name" --format '{{index .Config.Labels "org.opencontainers.image.created"}}' 2>/dev/null)

  if [ -z "$commit" ] || [ "$commit" = "unknown" ]; then
    echo "[$name] WARNING: no build label found — redeploy with scripts/deploy.sh to add tracking"
    return
  fi

  # Display container info
  echo "[$name] Built: ${commit:0:7} on ${date:-unknown}"

  # Compare container commit to local HEAD
  if [ "$commit" = "$LOCAL_COMMIT" ]; then
    echo "[$name] OK: up to date"
  else
    echo "[$name] STALE: container is behind local code — run scripts/deploy.sh"
  fi
}

# Check both containers
check "gravl-backend"
check "gravl-frontend"