#!/bin/sh
set -e

INSTALL_DIR="${SSH0_DIR:-$HOME/.ssh0}"
BIN_DIR="${SSH0_BIN:-$HOME/.local/bin}"
TARBALL="https://ssh0.sh/latest.tar.gz"

main() {
  printf '\033[1mssh0\033[0m installer\n'
  printf 'install dir: %s\n' "$INSTALL_DIR"
  printf 'bin dir:     %s\n\n' "$BIN_DIR"

  need_cmd curl
  need_cmd tar
  check_node

  if [ -d "$INSTALL_DIR" ]; then
    printf 'updating existing installation...\n'
    rm -rf "$INSTALL_DIR.bak"
    mv "$INSTALL_DIR" "$INSTALL_DIR.bak"
  fi

  printf 'downloading ssh0...\n'
  mkdir -p "$INSTALL_DIR"
  curl -fsSL "$TARBALL" | tar xz -C "$INSTALL_DIR" --strip-components=1

  cd "$INSTALL_DIR"
  if [ -f package.json ] && command -v npm >/dev/null 2>&1; then
    npm install --production --no-fund --no-audit 2>/dev/null || true
  fi

  mkdir -p "$BIN_DIR"
  ln -sf "$INSTALL_DIR/bin/wh" "$BIN_DIR/wh"
  ln -sf "$INSTALL_DIR/bin/ssh0" "$BIN_DIR/ssh0"
  chmod +x "$INSTALL_DIR/bin/wh" "$INSTALL_DIR/bin/ssh0"

  ensure_path
  rm -rf "$INSTALL_DIR.bak"

  printf '\n\033[32mdone.\033[0m\n'
  printf '  wh   — wormhole CLI (exec, shell, put, get, ping)\n'
  printf '  ssh0 — full protocol server + client\n'
  printf '\ntry: wh help\n'
}

check_node() {
  if command -v node >/dev/null 2>&1; then
    ver=$(node -v 2>/dev/null | sed 's/v//')
    major=$(echo "$ver" | cut -d. -f1)
    if [ "$major" -ge 18 ] 2>/dev/null; then
      printf 'node %s ✓\n' "$ver"
      return
    fi
    printf 'node %s found but >=18 required\n' "$ver"
  fi

  printf 'node not found or too old. install options:\n'
  printf '  curl -fsSL https://fnm.vercel.app/install | bash && fnm install 22\n'
  printf '  brew install node  (macOS)\n'
  printf '  apt install nodejs  (Debian/Ubuntu)\n'
  printf '  pacman -S nodejs  (Arch)\n'
  exit 1
}

need_cmd() {
  if ! command -v "$1" >/dev/null 2>&1; then
    printf 'error: %s is required but not found\n' "$1"
    exit 1
  fi
}

ensure_path() {
  case ":$PATH:" in
    *":$BIN_DIR:"*) return ;;
  esac

  shell_name=$(basename "${SHELL:-/bin/sh}")
  rc=""
  case "$shell_name" in
    zsh)  rc="$HOME/.zshrc" ;;
    bash)
      if [ -f "$HOME/.bash_profile" ]; then rc="$HOME/.bash_profile"
      else rc="$HOME/.bashrc"; fi ;;
    fish) rc="$HOME/.config/fish/config.fish" ;;
    *)    rc="$HOME/.profile" ;;
  esac

  if [ -n "$rc" ] && [ -f "$rc" ]; then
    if ! grep -q "$BIN_DIR" "$rc" 2>/dev/null; then
      printf '\nexport PATH="%s:$PATH"\n' "$BIN_DIR" >> "$rc"
      printf 'added %s to PATH in %s\n' "$BIN_DIR" "$rc"
    fi
  fi

  export PATH="$BIN_DIR:$PATH"
}

main "$@"