#!/usr/bin/env bash
# ==============================================================================
# docker-update.sh — Automatic daily update for the Dockerized EpicNext-CMS.
#
# Steps:
#   1. Verify the working tree is clean (uncommitted changes abort).
#   2. git pull (fast-forward only).
#   3. Run CMS migrations on the HOST (the slim runtime container has no source).
#   4. docker compose build (auto-detects pnpm/yarn/npm via lockfile).
#   5. docker compose up -d && wait for a healthy container.
#   6. Record everything in update.log.
#
# Exit codes: 0 ok, 1 update skipped, 2 build/deploy failed, 3 health failed.
# ==============================================================================

set -uo pipefail

DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "$DIR" || exit 2

LOG_FILE="${LOG_FILE:-$DIR/logs/docker-update.log}"
PM2_APP="${PM2_APP:-next}" # host-side CMS that must stay stopped (port 3002)

log()  { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" | tee -a "$LOG_FILE"; }
die()  { log "ERROR: $*"; exit "${2:-2}"; }

touch "$LOG_FILE"

log "=== Start docker-update ==="

# --- 0. Guard: uncommitted changes would break git pull / taint deploys ---
if ! { git diff --quiet --exit-code && git diff --cached --quiet --exit-code; }; then
  die "working tree has uncommitted changes; commit or stash first" 1
fi

# --- 1. Pull latest ---
git pull --ff-only --quiet 2>>"$LOG_FILE"
pull_status=$?
if [ $pull_status -ne 0 ]; then
  die "git pull failed (status $pull_status)" 1
fi
log "git pull OK: $(git rev-parse --short HEAD)"

# --- 2. Host-side migrations (idempotent; only applies CMS-owned tables) ---
if [ -f pnpm-lock.yaml ] && command -v pnpm >/dev/null 2>&1; then
  pnpm db:migrate >>"$LOG_FILE" 2>&1 || die "db:migrate (pnpm) failed"
elif command -v npm >/dev/null 2>&1; then
  npm run db:migrate >>"$LOG_FILE" 2>&1 || die "db:migrate (npm) failed"
else
  die "no package manager found for migrations" 2
fi
log "db:migrate OK"

# --- 3. Rebuild the image ---
docker compose build >>"$LOG_FILE" 2>&1 || die "docker compose build failed" 2
log "docker compose build OK"

# --- 4. Recreate the container ---
docker compose up -d >>"$LOG_FILE" 2>&1 || die "docker compose up failed" 2
log "docker compose up OK"

# --- 5. Wait for health (up to ~4 min) ---
healthy=0
for i in $(seq 1 16); do
  status="$(docker inspect --format='{{.State.Health.Status}}' epicnext-cms 2>/dev/null || true)"
  case "$status" in
    healthy) healthy=1; break ;;
    unhealthy) break ;;
  esac
  sleep 15
done

if [ "$healthy" -eq 1 ]; then
  log "CMS healthy after update (commit $(git rev-parse --short HEAD))"
else
  log "WARNING: container not healthy (status='${status:-unknown}')"
  # Leave the container running so it can be debugged; report failure exit.
  exit 3
fi

# --- 6. Make sure the stale host-side PM2 CMS stays stopped ---
if command -v pm2 >/dev/null 2>&1 && pm2 jlist >/dev/null 2>&1; then
  if pm2 list 2>/dev/null | grep -q "${PM2_APP}"; then
    pm2 stop "$PM2_APP" >/dev/null 2>&1 && log "pm2 '${PM2_APP}' kept stopped (avoids port 3002 clash)"
  fi
fi

log "=== docker-update finished OK ==="
exit 0