# Parse claudebox flags
SHELL_MODE=false
for arg in "$@"; do
  case "$arg" in
    --shell) SHELL_MODE=true; shift; break ;;
    --) shift; break ;;
    *) break ;;
  esac
done

# SANDBOX_PATH is injected by flake.nix via makeBinPath (only runtimeInputs, no host PATH)
# Resolve binary paths from runtimeInputs
SANDBOX_BASH="$(command -v bash)"
CLAUDE_BIN="$(command -v claude)"

# Record CWD
CWD=$(pwd)

# Ensure ~/.claudebox exists
mkdir -p "$HOME/.claudebox"

# Generate minimal .gitconfig (D-05)
GIT_NAME=$(git config --global user.name 2>/dev/null || echo "Claude User")
GIT_EMAIL=$(git config --global user.email 2>/dev/null || echo "claude@localhost")

GITCONFIG_TMP=$(mktemp)
trap 'rm -f "$GITCONFIG_TMP"' EXIT

cat > "$GITCONFIG_TMP" <<GITEOF
[user]
    name = $GIT_NAME
    email = $GIT_EMAIL
[safe]
    directory = *
GITEOF

# Build environment --setenv args array (D-03, D-04, SAND-02, SAND-03)
# Sandbox-generated vars -- set directly, never from host
ENV_ARGS=(
  --setenv HOME "$HOME"
  --setenv USER "$USER"
  --setenv PATH "$SANDBOX_PATH"
  --setenv SHELL "$SANDBOX_BASH"
  --setenv TMPDIR /tmp
  --setenv XDG_RUNTIME_DIR /tmp
  --setenv NIX_SSL_CERT_FILE /etc/ssl/certs/ca-certificates.crt
  --setenv SSL_CERT_FILE /etc/ssl/certs/ca-certificates.crt
)

# Allowlisted host vars -- only pass if set on host
HOST_ALLOWLIST=(TERM EDITOR LANG LC_ALL ANTHROPIC_API_KEY)
for var in "${HOST_ALLOWLIST[@]}"; do
  if [[ -v "$var" ]]; then
    ENV_ARGS+=(--setenv "$var" "${!var}")
  fi
done

# CLAUDEBOX_EXTRA_ENV escape hatch (D-03, comma-separated)
if [[ -v CLAUDEBOX_EXTRA_ENV ]]; then
  IFS=',' read -ra EXTRAS <<< "$CLAUDEBOX_EXTRA_ENV"
  for var in "${EXTRAS[@]}"; do
    var="${var// /}"  # trim whitespace
    if [[ -n "$var" ]] && [[ -v "$var" ]]; then
      ENV_ARGS+=(--setenv "$var" "${!var}")
    fi
  done
fi

# Build sandbox command
if [[ "$SHELL_MODE" == true ]]; then
  SANDBOX_CMD=("$SANDBOX_BASH" "$@")
else
  SANDBOX_CMD=("$CLAUDE_BIN" --dangerously-skip-permissions "$@")
fi

# exec bwrap (SAND-04 through SAND-15, UX-06, D-01)
exec bwrap \
  --clearenv \
  "${ENV_ARGS[@]}" \
  --tmpfs / \
  --proc /proc \
  --dev /dev \
  --tmpfs /tmp \
  --ro-bind /nix/store /nix/store \
  --bind /nix/var/nix /nix/var/nix \
  --ro-bind /etc/resolv.conf /etc/resolv.conf \
  --ro-bind /etc/ssl /etc/ssl \
  --ro-bind /etc/static /etc/static \
  --ro-bind /etc/passwd /etc/passwd \
  --ro-bind /etc/group /etc/group \
  --ro-bind /etc/hosts /etc/hosts \
  --ro-bind /etc/nsswitch.conf /etc/nsswitch.conf \
  --ro-bind /etc/nix /etc/nix \
  --symlink "$(readlink -f "$(command -v env)")" /usr/bin/env \
  --tmpfs "$HOME" \
  --bind "$HOME/.claudebox" "$HOME/.claude" \
  --ro-bind "$GITCONFIG_TMP" "$HOME/.gitconfig" \
  --bind "$CWD" "$CWD" \
  --chdir "$CWD" \
  -- "${SANDBOX_CMD[@]}"