# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the terms described in the LICENSE file in
# the root directory of this source tree.

import os

import pytest
import pytest_asyncio

from llama_stack.apis.agents import *  # noqa: F403
from llama_stack.providers.tests.resolver import resolve_impls_for_test
from llama_stack.providers.datatypes import *  # noqa: F403

from dotenv import load_dotenv

# How to run this test:
#
# 1. Ensure you have a conda environment with the right dependencies installed.
#    This includes `pytest` and `pytest-asyncio`.
#
# 2. Copy and modify the provider_config_example.yaml depending on the provider you are testing.
#
# 3. Run:
#
# ```bash
# PROVIDER_ID=<your_provider> \
#   MODEL_ID=<your_model> \
#   PROVIDER_CONFIG=provider_config.yaml \
#   pytest -s llama_stack/providers/tests/agents/test_agents.py \
#   --tb=short --disable-warnings
# ```

load_dotenv()


@pytest_asyncio.fixture(scope="session")
async def agents_settings():
    impls = await resolve_impls_for_test(
        Api.agents, deps=[Api.inference, Api.memory, Api.safety]
    )

    return {
        "impl": impls[Api.agents],
        "memory_impl": impls[Api.memory],
        "common_params": {
            "model": os.environ["MODEL_ID"] or "Llama3.1-8B-Instruct",
            "instructions": "You are a helpful assistant.",
        },
    }


@pytest.fixture
def sample_messages():
    return [
        UserMessage(content="What's the weather like today?"),
    ]


@pytest.fixture
def search_query_messages():
    return [
        UserMessage(content="What are the latest developments in quantum computing?"),
    ]


@pytest.fixture
def attachment_message():
    return [
        UserMessage(
            content="I am attaching some documentation for Torchtune. Help me answer questions I will ask next.",
        ),
    ]


@pytest.fixture
def query_attachment_messages():
    return [
        UserMessage(
            content="What are the top 5 topics that were explained? Only list succinct bullet points."
        ),
    ]


@pytest.mark.asyncio
async def test_create_agent_turn(agents_settings, sample_messages):
    agents_impl = agents_settings["impl"]

    # First, create an agent
    agent_config = AgentConfig(
        model=agents_settings["common_params"]["model"],
        instructions=agents_settings["common_params"]["instructions"],
        enable_session_persistence=True,
        sampling_params=SamplingParams(temperature=0.7, top_p=0.95),
        input_shields=[],
        output_shields=[],
        tools=[],
        max_infer_iters=5,
    )

    create_response = await agents_impl.create_agent(agent_config)
    agent_id = create_response.agent_id

    # Create a session
    session_create_response = await agents_impl.create_agent_session(
        agent_id, "Test Session"
    )
    session_id = session_create_response.session_id

    # Create and execute a turn
    turn_request = dict(
        agent_id=agent_id,
        session_id=session_id,
        messages=sample_messages,
        stream=True,
    )

    turn_response = [
        chunk async for chunk in await agents_impl.create_agent_turn(**turn_request)
    ]

    assert len(turn_response) > 0
    assert all(
        isinstance(chunk, AgentTurnResponseStreamChunk) for chunk in turn_response
    )

    # Check for expected event types
    event_types = [chunk.event.payload.event_type for chunk in turn_response]
    assert AgentTurnResponseEventType.turn_start.value in event_types
    assert AgentTurnResponseEventType.step_start.value in event_types
    assert AgentTurnResponseEventType.step_complete.value in event_types
    assert AgentTurnResponseEventType.turn_complete.value in event_types

    # Check the final turn complete event
    final_event = turn_response[-1].event.payload
    assert isinstance(final_event, AgentTurnResponseTurnCompletePayload)
    assert isinstance(final_event.turn, Turn)
    assert final_event.turn.session_id == session_id
    assert final_event.turn.input_messages == sample_messages
    assert isinstance(final_event.turn.output_message, CompletionMessage)
    assert len(final_event.turn.output_message.content) > 0


@pytest.mark.asyncio
async def test_rag_agent_as_attachments(
    agents_settings, attachment_message, query_attachment_messages
):
    urls = [
        "memory_optimizations.rst",
        "chat.rst",
        "llama3.rst",
        "datasets.rst",
        "qat_finetune.rst",
        "lora_finetune.rst",
    ]

    attachments = [
        Attachment(
            content=f"https://raw.githubusercontent.com/pytorch/torchtune/main/docs/source/tutorials/{url}",
            mime_type="text/plain",
        )
        for i, url in enumerate(urls)
    ]

    agents_impl = agents_settings["impl"]

    agent_config = AgentConfig(
        model=agents_settings["common_params"]["model"],
        instructions=agents_settings["common_params"]["instructions"],
        enable_session_persistence=True,
        sampling_params=SamplingParams(temperature=0.7, top_p=0.95),
        input_shields=[],
        output_shields=[],
        tools=[
            MemoryToolDefinition(
                memory_bank_configs=[],
                query_generator_config={
                    "type": "default",
                    "sep": " ",
                },
                max_tokens_in_context=4096,
                max_chunks=10,
            ),
        ],
        max_infer_iters=5,
    )

    create_response = await agents_impl.create_agent(agent_config)
    agent_id = create_response.agent_id

    # Create a session
    session_create_response = await agents_impl.create_agent_session(
        agent_id, "Test Session"
    )
    session_id = session_create_response.session_id

    # Create and execute a turn
    turn_request = dict(
        agent_id=agent_id,
        session_id=session_id,
        messages=attachment_message,
        attachments=attachments,
        stream=True,
    )

    turn_response = [
        chunk async for chunk in await agents_impl.create_agent_turn(**turn_request)
    ]

    assert len(turn_response) > 0

    # Create a second turn querying the agent
    turn_request = dict(
        agent_id=agent_id,
        session_id=session_id,
        messages=query_attachment_messages,
        stream=True,
    )

    turn_response = [
        chunk async for chunk in await agents_impl.create_agent_turn(**turn_request)
    ]

    assert len(turn_response) > 0


@pytest.mark.asyncio
async def test_create_agent_turn_with_brave_search(
    agents_settings, search_query_messages
):
    agents_impl = agents_settings["impl"]

    if "BRAVE_SEARCH_API_KEY" not in os.environ:
        pytest.skip("BRAVE_SEARCH_API_KEY not set, skipping test")

    # Create an agent with Brave search tool
    agent_config = AgentConfig(
        model=agents_settings["common_params"]["model"],
        instructions=agents_settings["common_params"]["instructions"],
        enable_session_persistence=True,
        sampling_params=SamplingParams(temperature=0.7, top_p=0.95),
        input_shields=[],
        output_shields=[],
        tools=[
            SearchToolDefinition(
                type=AgentTool.brave_search.value,
                api_key=os.environ["BRAVE_SEARCH_API_KEY"],
                engine=SearchEngineType.brave,
            )
        ],
        tool_choice=ToolChoice.auto,
        max_infer_iters=5,
    )

    create_response = await agents_impl.create_agent(agent_config)
    agent_id = create_response.agent_id

    # Create a session
    session_create_response = await agents_impl.create_agent_session(
        agent_id, "Test Session with Brave Search"
    )
    session_id = session_create_response.session_id

    # Create and execute a turn
    turn_request = dict(
        agent_id=agent_id,
        session_id=session_id,
        messages=search_query_messages,
        stream=True,
    )

    turn_response = [
        chunk async for chunk in await agents_impl.create_agent_turn(**turn_request)
    ]

    assert len(turn_response) > 0
    assert all(
        isinstance(chunk, AgentTurnResponseStreamChunk) for chunk in turn_response
    )

    # Check for expected event types
    event_types = [chunk.event.payload.event_type for chunk in turn_response]
    assert AgentTurnResponseEventType.turn_start.value in event_types
    assert AgentTurnResponseEventType.step_start.value in event_types
    assert AgentTurnResponseEventType.step_complete.value in event_types
    assert AgentTurnResponseEventType.turn_complete.value in event_types

    # Check for tool execution events
    tool_execution_events = [
        chunk
        for chunk in turn_response
        if isinstance(chunk.event.payload, AgentTurnResponseStepCompletePayload)
        and chunk.event.payload.step_details.step_type == StepType.tool_execution.value
    ]
    assert len(tool_execution_events) > 0, "No tool execution events found"

    # Check the tool execution details
    tool_execution = tool_execution_events[0].event.payload.step_details
    assert isinstance(tool_execution, ToolExecutionStep)
    assert len(tool_execution.tool_calls) > 0
    assert tool_execution.tool_calls[0].tool_name == BuiltinTool.brave_search
    assert len(tool_execution.tool_responses) > 0

    # Check the final turn complete event
    final_event = turn_response[-1].event.payload
    assert isinstance(final_event, AgentTurnResponseTurnCompletePayload)
    assert isinstance(final_event.turn, Turn)
    assert final_event.turn.session_id == session_id
    assert final_event.turn.input_messages == search_query_messages
    assert isinstance(final_event.turn.output_message, CompletionMessage)
    assert len(final_event.turn.output_message.content) > 0