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

REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
STACKS_DIR="$REPO_ROOT/stacks"
TARGET_ROOT="/srv"

usage() {
  echo "Usage:"
  echo "  $0 <stackname>        Deploy one stack (e.g. n8n)"
  echo "  $0 --all              Deploy all stacks"
  echo "  $0 --list             List stacks"
  exit 1
}

list_stacks() {
  find "$STACKS_DIR" -maxdepth 1 -mindepth 1 -type d -printf "%f\n" | sort
}

deploy_stack() {
  local stack="$1"
  local src="$STACKS_DIR/$stack"
  local dst="$TARGET_ROOT/$stack"

  if [[ ! -d "$src" ]]; then
    echo "ERROR: Stack '$stack' not found in $STACKS_DIR"
    exit 2
  fi

  if [[ ! -d "$dst" ]]; then
    echo "ERROR: Target dir '$dst' does not exist. Create it first:"
    echo "  sudo mkdir -p $dst && sudo chown -R $USER:$USER $dst"
    exit 3
  fi

  echo "==> Deploying stack: $stack"
  cp "$src/docker-compose.yml" "$dst/docker-compose.yml"

  # safety hint only
  if [[ -f "$src/.env.example" && ! -f "$dst/.env" ]]; then
    echo "NOTE: $dst/.env is missing. Create it from .env.example before starting."
  fi

  ( cd "$dst" && docker compose pull && docker compose up -d )
  ( cd "$dst" && docker compose ps )
  echo
}

main() {
  cd "$REPO_ROOT"
  git pull --ff-only

  if [[ "${1:-}" == "--list" ]]; then
    list_stacks
    exit 0
  fi

  if [[ "${1:-}" == "--all" ]]; then
    while read -r s; do
      deploy_stack "$s"
    done < <(list_stacks)
    exit 0
  fi

  [[ $# -eq 1 ]] || usage
  deploy_stack "$1"
}

main "$@"