#!/usr/bin/env bash
#
# install-dependencies-deb.sh
#
# Installs everything needed to build and run this project on Debian/Ubuntu:
#   - system packages (git, curl, build tools, ...)
#   - Node.js LTS (>= 20.9.0, required by Next.js 16) + npm
#   - project dependencies via `npm install`
#   - a production build via `npm run build`
#
# Usage:
#   ./install-dependencies-deb.sh            # install deps + npm install + npm run build
#   ./install-dependencies-deb.sh --no-build # install deps + npm install only
#   ./install-dependencies-deb.sh --no-npm   # system packages only
#
set -euo pipefail

MIN_NODE_MAJOR=20
MIN_NODE_MINOR=9

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
DO_NPM=1
DO_BUILD=1

usage() {
  cat <<'EOF'
install-dependencies-deb.sh — set up everything needed to build/run this project.

Installs system packages, Node.js LTS (>= 20.9.0) + npm, then runs
`npm install` and `npm run build`.

Usage:
  ./install-dependencies-deb.sh             system deps + npm install + build
  ./install-dependencies-deb.sh --no-build  system deps + npm install only
  ./install-dependencies-deb.sh --no-npm    system packages only
  ./install-dependencies-deb.sh -h|--help   show this help
EOF
}

for arg in "$@"; do
  case "$arg" in
    --no-npm)   DO_NPM=0; DO_BUILD=0 ;;
    --no-build) DO_BUILD=0 ;;
    -h|--help)  usage; exit 0 ;;
    *)
      echo "Unknown option: $arg" >&2
      exit 1
      ;;
  esac
done

log()  { printf '\n\033[1;34m==>\033[0m %s\n' "$*"; }
warn() { printf '\033[1;33mwarning:\033[0m %s\n' "$*" >&2; }
die()  { printf '\033[1;31merror:\033[0m %s\n' "$*" >&2; exit 1; }

# --- must be Debian/Ubuntu ------------------------------------------------
if [ ! -f /etc/os-release ]; then
  die "Cannot detect the OS (missing /etc/os-release). This script is for Debian/Ubuntu."
fi
# shellcheck disable=SC1091
. /etc/os-release
case "${ID:-}${ID_LIKE:-}" in
  *debian*|*ubuntu*) ;;
  *) warn "Detected '${PRETTY_NAME:-unknown OS}', not Debian/Ubuntu. Continuing anyway." ;;
esac

# --- root / sudo helper ---------------------------------------------------
# Prefer sudo when present, otherwise fall back to OpenDoas (doas).
SUDO=""
SUDO_ENV_FLAG=""
if [ "$(id -u)" -eq 0 ]; then
  SUDO=""
elif command -v sudo >/dev/null 2>&1; then
  SUDO="sudo"
  SUDO_ENV_FLAG="-E"   # sudo resets the environment by default; keep ours
elif command -v doas >/dev/null 2>&1; then
  SUDO="doas"
  SUDO_ENV_FLAG=""     # doas has no -E; it preserves the environment itself
else
  die "Not root and neither 'sudo' nor 'doas' is installed. Re-run as root."
fi

# --- system packages ------------------------------------------------------
log "Updating apt package lists"
$SUDO apt-get update -y

log "Installing base system packages"
$SUDO apt-get install -y --no-install-recommends \
  ca-certificates \
  curl \
  gnupg \
  git \
  build-essential \
  python3 \
  make \
  g++

# --- node.js --------------------------------------------------------------
node_ok() {
  command -v node >/dev/null 2>&1 || return 1
  local major minor
  major="$(node -p 'process.versions.node.split(".")[0]' 2>/dev/null || echo 0)"
  minor="$(node -p 'process.versions.node.split(".")[1]' 2>/dev/null || echo 0)"
  if [ "$major" -gt "$MIN_NODE_MAJOR" ] || { [ "$major" -eq "$MIN_NODE_MAJOR" ] && [ "$minor" -ge "$MIN_NODE_MINOR" ]; }; then
    return 0
  fi
  return 1
}

if node_ok; then
  log "Node.js $(node -v) already satisfies >= ${MIN_NODE_MAJOR}.${MIN_NODE_MINOR}.0"
else
  if command -v node >/dev/null 2>&1; then
    warn "Node.js $(node -v) is too old for Next.js 16; installing current LTS."
  fi
  log "Installing Node.js LTS from NodeSource"
  curl -fsSL https://deb.nodesource.com/setup_lts.x | $SUDO $SUDO_ENV_FLAG bash -
  $SUDO apt-get install -y nodejs
fi

node_ok || die "Node.js is still below ${MIN_NODE_MAJOR}.${MIN_NODE_MINOR}.0. Check 'node -v'."
command -v npm >/dev/null 2>&1 || die "npm was not installed alongside Node.js."
log "Using node $(node -v) / npm $(npm -v)"

# --- project dependencies -------------------------------------------------
if [ "$DO_NPM" -eq 1 ]; then
  [ -f "$SCRIPT_DIR/package.json" ] || die "package.json not found in $SCRIPT_DIR."
  log "Installing project dependencies (npm install)"
  ( cd "$SCRIPT_DIR" && npm install )

  if [ "$DO_BUILD" -eq 1 ]; then
    log "Building the project (npm run build)"
    ( cd "$SCRIPT_DIR" && npm run build )
  fi
fi

log "Done."
printf 'Start the dev server with:\n  cd %s && npm run dev\n' "$SCRIPT_DIR"