import os
import pathlib
import shutil
import signal
import subprocess
import tempfile
import time
import unittest
from unittest import mock

import pytest
from openpilot.selfdrive.manager.process import ManagerProcess


from openpilot.selfdrive.test.helpers import processes_context
from openpilot.common.params import Params


def run(args, **kwargs):
  return subprocess.run(args, **kwargs, check=True)


def update_release(directory, name, version, agnos_version, release_notes):
  with open(directory / "RELEASES.md", "w") as f:
    f.write(release_notes)

  (directory / "common").mkdir(exist_ok=True)

  with open(directory / "common" / "version.h", "w") as f:
    f.write(f'#define COMMA_VERSION "{version}"')

  with open(directory / "launch_env.sh", "w") as f:
    f.write(f'export AGNOS_VERSION="{agnos_version}"')


@pytest.mark.slow # TODO: can we test overlayfs in GHA?
class BaseUpdateTest(unittest.TestCase):
  @classmethod
  def setUpClass(cls):
    if "Base" in cls.__name__:
      raise unittest.SkipTest

  def setUp(self):
    self.tmpdir = tempfile.mkdtemp()

    run(["sudo", "mount", "-t", "tmpfs", "tmpfs", self.tmpdir]) # overlayfs doesn't work inside of docker unless this is a tmpfs

    self.mock_update_path = pathlib.Path(self.tmpdir)

    self.params = Params()

    self.basedir = self.mock_update_path / "openpilot"
    self.basedir.mkdir()

    self.staging_root = self.mock_update_path / "safe_staging"
    self.staging_root.mkdir()

    self.remote_dir = self.mock_update_path / "remote"
    self.remote_dir.mkdir()

    mock.patch("openpilot.common.basedir.BASEDIR", self.basedir).start()

    os.environ["UPDATER_STAGING_ROOT"] = str(self.staging_root)
    os.environ["UPDATER_LOCK_FILE"] = str(self.mock_update_path / "safe_staging_overlay.lock")

    self.MOCK_RELEASES = {
      "release3": ("0.1.2", "1.2", "0.1.2 release notes"),
      "master": ("0.1.3", "1.2", "0.1.3 release notes"),
    }

  def set_target_branch(self, branch):
    self.params.put("UpdaterTargetBranch", branch)

  def setup_basedir_release(self, release):
    self.params = Params()
    self.set_target_branch(release)

  def update_remote_release(self, release):
    raise NotImplementedError("")

  def setup_remote_release(self, release):
    raise NotImplementedError("")

  def additional_context(self):
    raise NotImplementedError("")

  def tearDown(self):
    mock.patch.stopall()
    try:
      run(["sudo", "umount", "-l", str(self.staging_root / "merged")])
      run(["sudo", "umount", "-l", self.tmpdir])
      shutil.rmtree(self.tmpdir)
    except Exception:
      print("cleanup failed...")

  def send_check_for_updates_signal(self, updated: ManagerProcess):
    updated.signal(signal.SIGUSR1.value)

  def send_download_signal(self, updated: ManagerProcess):
    updated.signal(signal.SIGHUP.value)

  def _test_params(self, branch, fetch_available, update_available):
    self.assertEqual(self.params.get("UpdaterTargetBranch", encoding="utf-8"), branch)
    self.assertEqual(self.params.get_bool("UpdaterFetchAvailable"), fetch_available)
    self.assertEqual(self.params.get_bool("UpdateAvailable"), update_available)

  def _test_update_params(self, branch, version, agnos_version, release_notes):
    self.assertTrue(self.params.get("UpdaterNewDescription", encoding="utf-8").startswith(f"{version} / {branch}"))
    self.assertEqual(self.params.get("UpdaterNewReleaseNotes", encoding="utf-8"), f"<p>{release_notes}</p>\n")

  def wait_for_condition(self, condition, timeout=12):
    start = time.monotonic()
    while True:
      waited = time.monotonic() - start
      if condition():
        print(f"waited {waited}s for condition ")
        return waited

      if waited > timeout:
        raise TimeoutError("timed out waiting for condition")

      time.sleep(1)

  def wait_for_idle(self):
    self.wait_for_condition(lambda: self.params.get("UpdaterState", encoding="utf-8") == "idle")

  def wait_for_fetch_available(self):
    self.wait_for_condition(lambda: self.params.get_bool("UpdaterFetchAvailable"))

  def wait_for_update_available(self):
    self.wait_for_condition(lambda: self.params.get_bool("UpdateAvailable"))

  def test_no_update(self):
    # Start on release3, ensure we don't fetch any updates
    self.setup_remote_release("release3")
    self.setup_basedir_release("release3")

    with self.additional_context(), processes_context(["updated"]) as [updated]:
      self._test_params("release3", False, False)
      self.wait_for_idle()
      self._test_params("release3", False, False)

      self.send_check_for_updates_signal(updated)

      self.wait_for_idle()

      self._test_params("release3", False, False)

  def test_new_release(self):
    # Start on release3, simulate a release3 commit, ensure we fetch that update properly
    self.setup_remote_release("release3")
    self.setup_basedir_release("release3")

    with self.additional_context(), processes_context(["updated"]) as [updated]:
      self._test_params("release3", False, False)
      self.wait_for_idle()
      self._test_params("release3", False, False)

      self.MOCK_RELEASES["release3"] = ("0.1.3", "1.2", "0.1.3 release notes")
      self.update_remote_release("release3")

      self.send_check_for_updates_signal(updated)

      self.wait_for_fetch_available()

      self._test_params("release3", True, False)

      self.send_download_signal(updated)

      self.wait_for_update_available()

      self._test_params("release3", False, True)
      self._test_update_params("release3", *self.MOCK_RELEASES["release3"])

  def test_switch_branches(self):
    # Start on release3, request to switch to master manually, ensure we switched
    self.setup_remote_release("release3")
    self.setup_remote_release("master")
    self.setup_basedir_release("release3")

    with self.additional_context(), processes_context(["updated"]) as [updated]:
      self._test_params("release3", False, False)
      self.wait_for_idle()
      self._test_params("release3", False, False)

      self.set_target_branch("master")
      self.send_check_for_updates_signal(updated)

      self.wait_for_fetch_available()

      self._test_params("master", True, False)

      self.send_download_signal(updated)

      self.wait_for_update_available()

      self._test_params("master", False, True)
      self._test_update_params("master", *self.MOCK_RELEASES["master"])

  def test_agnos_update(self):
    # Start on release3, push an update with an agnos change
    self.setup_remote_release("release3")
    self.setup_basedir_release("release3")

    with self.additional_context(), \
        mock.patch("openpilot.system.hardware.AGNOS", "True"), \
        mock.patch("openpilot.system.hardware.tici.hardware.Tici.get_os_version", "1.2"), \
        mock.patch("openpilot.system.hardware.tici.agnos.get_target_slot_number"), \
        mock.patch("openpilot.system.hardware.tici.agnos.flash_agnos_update"), \
          processes_context(["updated"]) as [updated]:

      self._test_params("release3", False, False)
      self.wait_for_idle()
      self._test_params("release3", False, False)

      self.MOCK_RELEASES["release3"] = ("0.1.3", "1.3", "0.1.3 release notes")
      self.update_remote_release("release3")

      self.send_check_for_updates_signal(updated)

      self.wait_for_fetch_available()

      self._test_params("release3", True, False)

      self.send_download_signal(updated)

      self.wait_for_update_available()

      self._test_params("release3", False, True)
      self._test_update_params("release3", *self.MOCK_RELEASES["release3"])