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

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
ENV_FILE="${1:-$ROOT_DIR/.env.production}"
COMPOSE_FILE="${2:-$ROOT_DIR/infra/docker-compose.prod.yml}"

if [[ "${1:-}" == "--help" || "${1:-}" == "-h" ]]; then
  cat <<'USAGE'
Usage:
  scripts/ops/preflight-prod.sh [env-file] [compose-file]

Examples:
  scripts/ops/preflight-prod.sh
  scripts/ops/preflight-prod.sh .env.production infra/docker-compose.prod.yml

Checks:
  - required host tools exist and docker daemon is reachable
  - production environment values pass validation
  - production compose file renders successfully
  - expected core services are present in compose config
USAGE
  exit 0
fi

if [[ ! -f "$ENV_FILE" ]]; then
  echo "[error] env file not found: $ENV_FILE" >&2
  exit 1
fi

if [[ ! -f "$COMPOSE_FILE" ]]; then
  echo "[error] compose file not found: $COMPOSE_FILE" >&2
  exit 1
fi

require_cmd() {
  local cmd="$1"
  if ! command -v "$cmd" >/dev/null 2>&1; then
    echo "[error] required command not found: $cmd" >&2
    exit 1
  fi
}

for cmd in docker node bash; do
  require_cmd "$cmd"
done

if ! docker info >/dev/null 2>&1; then
  echo "[error] docker daemon is not reachable" >&2
  exit 1
fi

echo "[step] validating production environment values..."
node "$ROOT_DIR/scripts/check-production-env.mjs" "$ENV_FILE"

echo "[step] validating compose rendering..."
if ! docker compose --env-file "$ENV_FILE" -f "$COMPOSE_FILE" config >/dev/null; then
  echo "[error] docker compose config validation failed" >&2
  exit 1
fi

mapfile -t configured_services < <(docker compose --env-file "$ENV_FILE" -f "$COMPOSE_FILE" config --services)
required_services=(gateway frontend auth api postgres rustfs rustfs-init)

for service in "${required_services[@]}"; do
  found=0
  for configured in "${configured_services[@]}"; do
    if [[ "$configured" == "$service" ]]; then
      found=1
      break
    fi
  done
  if [[ "$found" -ne 1 ]]; then
    echo "[error] required service missing from compose config: $service" >&2
    exit 1
  fi
done

echo "[ok] production preflight checks passed"