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

APP_NAME="${1:-}"
GIT_REF="${2:-}"

if [[ -z "$APP_NAME" || -z "$GIT_REF" ]]; then
  echo "usage: deploy-app <app_name> <git_ref>" >&2
  exit 2
fi

if ! [[ "$APP_NAME" =~ ^[A-Za-z0-9._-]+$ ]]; then
  echo "invalid app name: $APP_NAME" >&2
  exit 2
fi

if ! [[ "$GIT_REF" =~ ^[0-9a-fA-F]{7,40}$ ]]; then
  echo "invalid git ref: $GIT_REF" >&2
  exit 2
fi

APP_DIR="/srv/apps/$APP_NAME"

if [[ ! -d "$APP_DIR/.git" ]]; then
  echo "app repo not present at $APP_DIR; clone it first (or extend deploy-app to clone)" >&2
  exit 1
fi

cd "$APP_DIR"
git fetch --all --prune

git checkout -f "$GIT_REF"

git submodule update --init --recursive

if [[ -x "./deploy.sh" ]]; then
  ./deploy.sh
else
  echo "ERROR: deploy.sh missing or not executable" >&2
  exit 1
fi