"""Exercise the real Linux reader through the real loopback HTTP adapter."""

import http.client
import json
import tempfile
import threading
import unittest
from pathlib import Path
from types import SimpleNamespace

from openpilot.starpilot.galaxy.access import GalaxyAccessOwner
from openpilot.starpilot.galaxy.server import make_server
from openpilot.starpilot.galaxy.system_monitor import SystemMonitor


class SystemMonitorRuntimeTest(unittest.TestCase):
  def setUp(self):
    self.directory = tempfile.TemporaryDirectory()
    self.addCleanup(self.directory.cleanup)
    self.root = Path(self.directory.name)
    self.time = 10.0
    self.monitor = SystemMonitor(self.root, clock=lambda: self.time, wall_clock=lambda: 1_000_000 + self.time,
                                 disk_usage=lambda _: SimpleNamespace(used=2 ** 30, total=4 * 2 ** 30), page_size=4096)
    self.write_snapshot(100, 100, 10)

  def write_snapshot(self, user, idle, ticks, *, start=1000):
    (self.root / 'stat').write_text(f'cpu {user} 0 0 {idle} 0 0 0 0\ncpu0 {user} 0 0 {idle} 0 0 0 0\n')
    (self.root / 'meminfo').write_text('MemTotal: 4096000 kB\nMemAvailable: 1024000 kB\n')
    (self.root / 'uptime').write_text('300 0\n')
    process = self.root / '42'
    process.mkdir(exist_ok=True)
    fields = ['0'] * 22
    fields[0], fields[11], fields[19], fields[21] = 'S', str(ticks), str(start), '256'
    (process / 'stat').write_text(f'42 (worker (test)) {" ".join(fields)}')
    (process / 'cmdline').write_bytes(b'python\0-m\0openpilot.selfdrive.controls.controlsd\0--private-argument\0')

  def test_cpu_capacity_pid_reuse_and_monotonic_reset(self):
    first = self.monitor.sample()
    self.assertIsNone(first['cpuPercent'])
    self.assertIsNone(first['processes'][0]['cpu'])
    self.assertEqual(first['processes'][0]['name'], 'openpilot.selfdrive.controls.controlsd')
    self.assertNotIn('private-argument', json.dumps(first))
    self.time += 2
    self.write_snapshot(160, 140, 30)
    second = self.monitor.sample()
    self.assertEqual(second['cpuPercent'], 60)
    self.assertEqual(second['processes'][0]['cpu'], 20)
    self.assertEqual(second['processes'][0]['memoryMiB'], 1)
    self.time += 2
    self.write_snapshot(220, 180, 40, start=2000)
    self.assertIsNone(self.monitor.sample()['processes'][0]['cpu'])
    self.time = 1
    self.write_snapshot(280, 220, 60, start=2000)
    self.assertIsNone(self.monitor.sample()['cpuPercent'])

  def test_unavailable_fields_and_failed_interval_are_not_zero_or_stale(self):
    self.monitor.sample()
    (self.root / 'meminfo').write_text('MemTotal: 4096000 kB\nMemFree: 1 kB\n')
    (self.root / '53').mkdir()  # Process disappears during enumeration.
    self.time += 2
    sample = self.monitor.sample()
    self.assertIsNone(sample['memory']['usedMiB'])
    self.assertIsNone(sample['memory']['percent'])
    self.assertEqual(sample['processCount'], 1)
    self.assertNotIn('vitals', sample)
    (self.root / 'stat').unlink()
    with self.assertRaises(OSError):
      self.monitor.sample()
    self.time += 2
    self.write_snapshot(300, 200, 50)
    self.assertIsNone(self.monitor.sample()['cpuPercent'])

  def test_real_http_source_origin_static_paths_and_read_only_boundary(self):
    owner = GalaxyAccessOwner(self.root / 'access')
    self.assertTrue(owner.configure('test-password', lambda: True))
    server = make_server(port=0, monitor=self.monitor, owner=owner)
    worker = threading.Thread(target=server.serve_forever, kwargs={'poll_interval': 0.01}, daemon=True)
    worker.start()
    try:
      def request(path, *, method='GET', headers=None, body=None):
        connection = http.client.HTTPConnection('127.0.0.1', server.server_port, timeout=2)
        try:
          connection.request(method, path, body=body, headers=headers or {})
          response = connection.getresponse()
          return response.status, response.read(), dict(response.getheaders())
        finally:
          connection.close()

      self.assertEqual(request('/api/system/monitor')[0], 401)
      origin = f'http://127.0.0.1:{server.server_port}'
      status, body, login_headers = request('/api/auth/login', method='POST', headers={
        'Content-Type': 'application/json', 'Origin': origin}, body='{"password":"test-password"}')
      self.assertEqual(status, 200)
      cookie = login_headers['Set-Cookie'].split(';', 1)[0]
      auth = {'Cookie': cookie}
      status, body, headers = request('/api/system/monitor', headers=auth)
      self.assertEqual(status, 200)
      self.assertEqual(json.loads(body)['mode'], 'local-runtime')
      self.assertEqual(headers['Cache-Control'], 'no-store')
      self.assertNotIn('Access-Control-Allow-Origin', headers)
      self.assertEqual(json.loads(request('/data/runtime.json')[1])['monitor'], 'local')
      self.assertIn(b'galaxy-app', request('/')[1])
      for path in ('/../server.py', '/%2e%2e/server.py'):
        self.assertEqual(request(path)[0], 404)
      for path in ('/api/params', '/api/vehicle'):
        self.assertEqual(request(path, headers=auth)[0], 404)
      self.assertEqual(request('/api/system/monitor', headers={'Host': 'other.example'})[0], 403)
      self.assertEqual(request('/api/system/monitor', headers={'Origin': 'https://other.example'})[0], 403)
      self.assertEqual(request('/api/system/monitor', method='POST', headers={'Origin': origin})[0], 405)
      (self.root / 'stat').unlink()
      status, body, _ = request('/api/system/monitor', headers=auth)
      self.assertEqual(status, 503)
      self.assertNotIn('sampledAt', json.loads(body))
    finally:
      server.shutdown()
      worker.join(timeout=2)
      server.server_close()