# Copyright 2025 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
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# limitations under the License.

"""Testings for the SequentialAgent."""

from typing import AsyncGenerator

from google.adk.agents.base_agent import BaseAgent
from google.adk.agents.invocation_context import InvocationContext
from google.adk.agents.sequential_agent import SequentialAgent
from google.adk.events.event import Event
from google.adk.sessions.in_memory_session_service import InMemorySessionService
from google.genai import types
import pytest
from typing_extensions import override


class _TestingAgent(BaseAgent):

  @override
  async def _run_async_impl(
      self, ctx: InvocationContext
  ) -> AsyncGenerator[Event, None]:
    yield Event(
        author=self.name,
        invocation_id=ctx.invocation_id,
        content=types.Content(
            parts=[types.Part(text=f'Hello, async {self.name}!')]
        ),
    )

  @override
  async def _run_live_impl(
      self, ctx: InvocationContext
  ) -> AsyncGenerator[Event, None]:
    yield Event(
        author=self.name,
        invocation_id=ctx.invocation_id,
        content=types.Content(
            parts=[types.Part(text=f'Hello, live {self.name}!')]
        ),
    )


async def _create_parent_invocation_context(
    test_name: str, agent: BaseAgent
) -> InvocationContext:
  session_service = InMemorySessionService()
  session = await session_service.create_session(
      app_name='test_app', user_id='test_user'
  )
  return InvocationContext(
      invocation_id=f'{test_name}_invocation_id',
      agent=agent,
      session=session,
      session_service=session_service,
  )


@pytest.mark.asyncio
async def test_run_async(request: pytest.FixtureRequest):
  agent_1 = _TestingAgent(name=f'{request.function.__name__}_test_agent_1')
  agent_2 = _TestingAgent(name=f'{request.function.__name__}_test_agent_2')
  sequential_agent = SequentialAgent(
      name=f'{request.function.__name__}_test_agent',
      sub_agents=[
          agent_1,
          agent_2,
      ],
  )
  parent_ctx = await _create_parent_invocation_context(
      request.function.__name__, sequential_agent
  )
  events = [e async for e in sequential_agent.run_async(parent_ctx)]

  assert len(events) == 2
  assert events[0].author == agent_1.name
  assert events[1].author == agent_2.name
  assert events[0].content.parts[0].text == f'Hello, async {agent_1.name}!'
  assert events[1].content.parts[0].text == f'Hello, async {agent_2.name}!'


@pytest.mark.asyncio
async def test_run_async_skip_if_no_sub_agent(request: pytest.FixtureRequest):
  sequential_agent = SequentialAgent(
      name=f'{request.function.__name__}_test_agent',
      sub_agents=[],
  )
  parent_ctx = await _create_parent_invocation_context(
      request.function.__name__, sequential_agent
  )
  events = [e async for e in sequential_agent.run_async(parent_ctx)]

  assert not events


@pytest.mark.asyncio
async def test_run_live(request: pytest.FixtureRequest):
  agent_1 = _TestingAgent(name=f'{request.function.__name__}_test_agent_1')
  agent_2 = _TestingAgent(name=f'{request.function.__name__}_test_agent_2')
  sequential_agent = SequentialAgent(
      name=f'{request.function.__name__}_test_agent',
      sub_agents=[
          agent_1,
          agent_2,
      ],
  )
  parent_ctx = await _create_parent_invocation_context(
      request.function.__name__, sequential_agent
  )
  events = [e async for e in sequential_agent.run_live(parent_ctx)]

  assert len(events) == 2
  assert events[0].author == agent_1.name
  assert events[1].author == agent_2.name
  assert events[0].content.parts[0].text == f'Hello, live {agent_1.name}!'
  assert events[1].content.parts[0].text == f'Hello, live {agent_2.name}!'
