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

APP_NAME=""
TAG=""
PORT=""
INTERNAL_PORT="80"
ENV=""
ENV_OVERRIDE=""

while [[ $# -gt 0 ]]; do
case $1 in
    --name)          APP_NAME="$2";     shift 2 ;;
    --tag)           TAG="$2";          shift 2 ;;
    --port)          PORT="$2";         shift 2 ;;
    --internal-port) INTERNAL_PORT="$2";shift 2 ;;
    --env)           ENV="$2";          shift 2 ;;
    --env-override)  ENV_OVERRIDE="$2"; shift 2 ;;
    *) echo "Unknown arg: $1"; exit 1 ;;
esac
done

CONTAINER="${APP_NAME}-${TAG}"
ON_DISK="/opt/apps/${APP_NAME}/.env.${ENV}"

echo "→ Deploying container: ${CONTAINER} on port ${PORT}"

docker stop "${CONTAINER}" 2>/dev/null && docker rm "${CONTAINER}" 2>/dev/null || true

ENV_FILE_ARG=""
HAS_ON_DISK=0
HAS_OVERRIDE=0
[[ -f "${ON_DISK}" ]] && HAS_ON_DISK=1
[[ -n "${ENV_OVERRIDE}" && -f "${ENV_OVERRIDE}" ]] && HAS_OVERRIDE=1

if (( HAS_ON_DISK == 1 && HAS_OVERRIDE == 0 )); then
  ENV_FILE_ARG="--env-file ${ON_DISK}"
elif (( HAS_OVERRIDE == 1 && HAS_ON_DISK == 0 )); then
  ENV_FILE_ARG="--env-file ${ENV_OVERRIDE}"
elif (( HAS_ON_DISK == 1 && HAS_OVERRIDE == 1 )); then
  MERGED=$(mktemp)
  # On-disk first, override second; tac/awk/tac keeps the last occurrence per key.
  { cat "${ON_DISK}"; echo; cat "${ENV_OVERRIDE}"; } \
    | grep -Ev '^[[:space:]]*(#|$)' \
    | tac | awk -F= '!seen[$1]++' | tac \
    > "${MERGED}"
  ENV_FILE_ARG="--env-file ${MERGED}"
fi

docker run -d \
--name "${CONTAINER}" \
--restart unless-stopped \
-p "0.0.0.0:${PORT}:${INTERNAL_PORT}" \
-e NODE_ENV=production \
-e PORT="${INTERNAL_PORT}" \
${ENV_FILE_ARG} \
"${APP_NAME}:${TAG}"

echo "✓ Container ${CONTAINER} running on 0.0.0.0:${PORT}"