import asyncio
from copy import deepcopy
import os
import tempfile
from time import perf_counter
import unittest
from unittest.mock import AsyncMock, Mock, patch

from server.Server import Server

class TestBattlesnakeLifecycle(unittest.IsolatedAsyncioTestCase):
  def setUp(self):
    self.server = Server(
      data_path=os.path.dirname(os.path.dirname(__file__)),
      snake_type='TemplateSnake', storage_type='LocalStorage',
      gameplay_db_enabled=False,
    )
    snake = {
      'id': 'snake-1', 'name': 'test', 'health': 100, 'length': 3,
      'head': {'x': 1, 'y': 1},
      'body': [{'x': 1, 'y': 1}] * 3,
    }
    self.state = {
      'game': {
        'id': 'game-1', 'source': 'test', 'map': 'standard', 'timeout': 500,
        'ruleset': {'name': 'standard', 'version': 'v1'},
      },
      'turn': 0, 'you': snake,
      'board': {'width': 11, 'height': 11, 'food': [], 'hazards': [], 'snakes': [snake]},
    }
    self.headers = {'User-Agent': 'BattlesnakeArena'}

  async def test_slow_io_does_not_delay_acknowledgements_or_reorder_events(self):
    events = []
    gate = asyncio.Event()

    async def slow_start(*args):
      await gate.wait()
      await asyncio.sleep(0.55)
      events.append('start')

    async def slow_end(*args):
      await asyncio.sleep(0.55)
      events.append('end')

    async def record_turn(*args):
      events.append('turn')

    server = self.server
    server.logger = Mock()
    server.logger.info.return_value = None
    server.gameplay_tracking.record_gameplay_start = slow_start
    server.gameplay_tracking.record_gameplay_end = slow_end
    server.gameplay_tracking.record_gameplay_turn_snapshot = record_turn
    server.dashboard_query.push_dashboard_games_update = AsyncMock()
    server.dashboard_query.push_dashboard_game_replay_update = AsyncMock()
    server.metrics_collector.record_game_started = AsyncMock()
    server.metrics_collector.record_game_end = AsyncMock()
    client = server.app.test_client()

    started = perf_counter()
    response = await client.post('/start', json=self.state, headers=self.headers)
    start_ms = (perf_counter() - started) * 1000
    self.assertEqual(response.status_code, 200)
    self.assertEqual(await response.get_data(), b'ok')
    self.assertLess(start_ms, 500)
    self.assertIn('game-1', server.game_runtime.running_games)
    self.assertEqual(events, [])

    # A real move request must not overtake the pending start DB write.
    response = await client.post('/move', json=self.state, headers=self.headers)
    self.assertEqual(response.status_code, 200)
    self.assertIn((await response.get_json())['move'], ('up', 'down', 'left', 'right'))
    end_state = deepcopy(self.state)
    end_state['turn'] = 1
    started = perf_counter()
    response = await client.post('/end', json=end_state, headers=self.headers)
    end_ms = (perf_counter() - started) * 1000
    self.assertEqual(response.status_code, 200)
    self.assertLess(end_ms, 500)
    self.assertNotIn('game-1', server.game_runtime.running_games)
    self.assertEqual(events, [])

    gate.set()
    await server.game_lifecycle.drain()
    self.assertEqual(events, ['start', 'turn', 'end'])
    self.assertEqual(server.game_lifecycle.pending, {})
    server.metrics_collector.record_game_started.assert_awaited_once_with(1)
    server.metrics_collector.record_game_end.assert_awaited_once_with(end_state)
    print(f'Lifecycle HTTP timings with >500 ms I/O: start={start_ms:.1f} ms, end={end_ms:.1f} ms')

  async def test_export_failure_still_records_result_and_cleans_runtime(self):
    server = self.server
    server.logger = Mock()
    server.logger.info.return_value = None
    server.gameplay_tracking.record_gameplay_start = AsyncMock()
    server.gameplay_tracking.record_gameplay_end = AsyncMock()
    server.dashboard_query.push_dashboard_games_update = AsyncMock()
    server.metrics_collector.record_game_end = AsyncMock()
    client = server.app.test_client()
    await client.post('/start', json=self.state, headers=self.headers)
    await server.game_lifecycle.drain()
    board = server.game_runtime.running_games['game-1']
    board.save = AsyncMock(side_effect=OSError('export failed'))
    server.store_game_state = True
    with patch('server.services.game_lifecycle.StorageLoader.build', return_value=object):
      response = await client.post('/end', json=self.state, headers=self.headers)
      await server.game_lifecycle.drain()
    self.assertEqual(response.status_code, 200)
    self.assertNotIn('game-1', server.game_runtime.running_games)
    board.save.assert_awaited_once()
    server.gameplay_tracking.record_gameplay_end.assert_awaited_once()
    server.metrics_collector.record_game_end.assert_awaited_once()

  async def test_real_sqlite_lifecycle_persists_after_acknowledgements(self):
    with tempfile.TemporaryDirectory() as folder:
      server = Server(
        data_path=folder, snake_type='TemplateSnake', storage_type='LocalStorage',
        gameplay_db_path=os.path.join(folder, 'gameplay.sqlite3'),
      )
      server.logger = Mock()
      server.logger.info.return_value = None
      async with server.app.test_app():
        client = server.app.test_client()
        timings = {}
        for endpoint in ('start', 'end'):
          started = perf_counter()
          response = await client.post('/' + endpoint, json=self.state, headers=self.headers)
          timings[endpoint] = (perf_counter() - started) * 1000
          self.assertEqual(response.status_code, 200)
          self.assertLess(timings[endpoint], 500)
        await server.game_lifecycle.drain()
        replay = await server.gameplay_database.get_game_replay('game-1')
        self.assertIsNotNone(replay)
        self.assertNotEqual(replay['game']['status'], 'running')
        print(f'Real SQLite HTTP timings: {timings}')

  async def test_invalid_agent_does_not_schedule_work(self):
    response = await self.server.app.test_client().post('/start', json=self.state)
    self.assertEqual(response.status_code, 404)
    self.assertEqual(self.server.game_lifecycle.pending, {})