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

ROOT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)
# shellcheck source=tests/lib/assert.sh
source "${ROOT_DIR}/tests/lib/assert.sh"

maybe_enter_namespace() {
  if (( EUID == 0 )); then
    return 0
  fi

  if [[ ${IPF_IN_NAMESPACE:-0} == 1 ]]; then
    return 0
  fi

  if command -v unshare >/dev/null 2>&1 && unshare -Ur true >/dev/null 2>&1; then
    exec unshare -Ur env IPF_IN_NAMESPACE=1 bash "$0"
  fi

  printf 'SKIP: 安装测试需要 root 或可用的 unshare。\n'
  exit 0
}

status_of() {
  set +e
  "$@" >/dev/null 2>&1
  local rc=$?
  set -e
  printf '%s\n' "${rc}"
}

maybe_enter_namespace

TMP_DIR=$(mktemp -d)
trap 'rm -rf "${TMP_DIR}"' EXIT

TARGET_BIN="${TMP_DIR}/bin/iptables-forward"
OTHER_TARGET="${TMP_DIR}/bin/not-ours"
SOURCE_SCRIPT="${ROOT_DIR}/iptables-forward.sh"

install_output=$(INSTALL_TARGET="${TARGET_BIN}" "${ROOT_DIR}/install.sh")
assert_contains "${install_output}" '已创建链接:' 'install should create symlink on first run'
[[ -L ${TARGET_BIN} ]] || fail 'install should create a symlink'
assert_eq "${SOURCE_SCRIPT}" "$(readlink -- "${TARGET_BIN}")" 'install should link to project entry script'

install_output=$(INSTALL_TARGET="${TARGET_BIN}" "${ROOT_DIR}/install.sh")
assert_contains "${install_output}" '链接已存在:' 'install should be idempotent for existing project link'

printf 'keep-me\n' >"${OTHER_TARGET}"
assert_status '1' "$(status_of env INSTALL_TARGET="${OTHER_TARGET}" "${ROOT_DIR}/install.sh")" 'install should refuse to overwrite non-project target'
assert_eq 'keep-me' "$(cat "${OTHER_TARGET}")" 'install refusal should keep existing target untouched'

uninstall_output=$(INSTALL_TARGET="${TARGET_BIN}" "${ROOT_DIR}/install.sh" --uninstall)
assert_contains "${uninstall_output}" '已删除链接:' 'uninstall should remove project symlink'
[[ ! -e ${TARGET_BIN} && ! -L ${TARGET_BIN} ]] || fail 'uninstall should remove installed symlink'

assert_status '1' "$(status_of env INSTALL_TARGET="${OTHER_TARGET}" "${ROOT_DIR}/install.sh" --uninstall)" 'uninstall should refuse to delete non-project target'
assert_eq 'keep-me' "$(cat "${OTHER_TARGET}")" 'uninstall refusal should keep existing target untouched'

pass 'test_install.sh'