"""Test ChatOpenAI chat model."""

import base64
import json
import os
from collections.abc import AsyncIterator
from pathlib import Path
from textwrap import dedent
from typing import TYPE_CHECKING, Any, Literal, cast

import httpx
import pytest
from langchain_core.callbacks import CallbackManager
from langchain_core.messages import (
    AIMessage,
    AIMessageChunk,
    BaseMessage,
    BaseMessageChunk,
    HumanMessage,
    SystemMessage,
    ToolCall,
    ToolMessage,
)
from langchain_core.outputs import ChatGeneration, ChatResult, LLMResult
from langchain_tests.utils.stream_lifecycle import assert_valid_event_stream
from pydantic import BaseModel, Field, field_validator
from typing_extensions import TypedDict

from langchain_openai import ChatOpenAI
from tests.unit_tests.fake.callbacks import FakeCallbackHandler

if TYPE_CHECKING:
    from langchain_core.language_models.chat_model_stream import ChatModelStream

MAX_TOKEN_COUNT = 100


@pytest.mark.scheduled
def test_chat_openai() -> None:
    """Test ChatOpenAI wrapper."""
    chat = ChatOpenAI(
        temperature=0.7,
        base_url=None,
        organization=None,
        openai_proxy=None,
        timeout=10.0,
        max_retries=3,
        http_client=None,
        n=1,
        max_tokens=MAX_TOKEN_COUNT,  # type: ignore[call-arg]
        default_headers=None,
        default_query=None,
    )
    message = HumanMessage(content="Hello")
    response = chat.invoke([message])
    assert isinstance(response, BaseMessage)
    assert isinstance(response.content, str)


def test_chat_openai_model() -> None:
    """Test ChatOpenAI wrapper handles model_name."""
    chat = ChatOpenAI(model="foo")
    assert chat.model_name == "foo"
    chat = ChatOpenAI(model_name="bar")  # type: ignore[call-arg]
    assert chat.model_name == "bar"


def test_callable_api_key(monkeypatch: pytest.MonkeyPatch) -> None:
    original_key = os.environ["OPENAI_API_KEY"]

    calls = {"sync": 0}

    def get_openai_api_key() -> str:
        calls["sync"] += 1
        return original_key

    monkeypatch.delenv("OPENAI_API_KEY")

    model = ChatOpenAI(model="gpt-4.1-mini", api_key=get_openai_api_key)
    response = model.invoke("hello")
    assert isinstance(response, AIMessage)
    assert calls["sync"] == 1


async def test_callable_api_key_async(monkeypatch: pytest.MonkeyPatch) -> None:
    original_key = os.environ["OPENAI_API_KEY"]

    calls = {"sync": 0, "async": 0}

    def get_openai_api_key() -> str:
        calls["sync"] += 1
        return original_key

    async def get_openai_api_key_async() -> str:
        calls["async"] += 1
        return original_key

    monkeypatch.delenv("OPENAI_API_KEY")

    model = ChatOpenAI(model="gpt-4.1-mini", api_key=get_openai_api_key)
    response = model.invoke("hello")
    assert isinstance(response, AIMessage)
    assert calls["sync"] == 1

    response = await model.ainvoke("hello")
    assert isinstance(response, AIMessage)
    assert calls["sync"] == 2

    model = ChatOpenAI(model="gpt-4.1-mini", api_key=get_openai_api_key_async)
    async_response = await model.ainvoke("hello")
    assert isinstance(async_response, AIMessage)
    assert calls["async"] == 1

    with pytest.raises(ValueError, match="Sync client is not available"):
        # This intentionally records a failed ChatOpenAI run in scheduled LangSmith
        # traces: async API-key callables are valid for async methods, but sync
        # invocation must fail.
        _ = model.invoke("hello")


@pytest.mark.parametrize("use_responses_api", [False, True])
def test_chat_openai_system_message(use_responses_api: bool) -> None:
    """Test ChatOpenAI wrapper with system message."""
    chat = ChatOpenAI(use_responses_api=use_responses_api, max_tokens=MAX_TOKEN_COUNT)  # type: ignore[call-arg]
    system_message = SystemMessage(content="You are to chat with the user.")
    human_message = HumanMessage(content="Hello")
    response = chat.invoke([system_message, human_message])
    assert isinstance(response, BaseMessage)
    assert isinstance(response.text, str)


@pytest.mark.scheduled
def test_chat_openai_generate() -> None:
    """Test ChatOpenAI wrapper with generate."""
    chat = ChatOpenAI(max_tokens=MAX_TOKEN_COUNT, n=2)  # type: ignore[call-arg]
    message = HumanMessage(content="Hello")
    response = chat.generate([[message], [message]])
    assert isinstance(response, LLMResult)
    assert len(response.generations) == 2
    assert response.llm_output
    for generations in response.generations:
        assert len(generations) == 2
        for generation in generations:
            assert isinstance(generation, ChatGeneration)
            assert isinstance(generation.text, str)
            assert generation.text == generation.message.content


@pytest.mark.scheduled
def test_chat_openai_multiple_completions() -> None:
    """Test ChatOpenAI wrapper with multiple completions."""
    chat = ChatOpenAI(max_tokens=MAX_TOKEN_COUNT, n=5)  # type: ignore[call-arg]
    message = HumanMessage(content="Hello")
    response = chat._generate([message])
    assert isinstance(response, ChatResult)
    assert len(response.generations) == 5
    for generation in response.generations:
        assert isinstance(generation.message, BaseMessage)
        assert isinstance(generation.message.content, str)


@pytest.mark.scheduled
@pytest.mark.parametrize("use_responses_api", [False, True])
def test_chat_openai_streaming(use_responses_api: bool) -> None:
    """Test that streaming correctly invokes on_llm_new_token callback."""
    callback_handler = FakeCallbackHandler()
    callback_manager = CallbackManager([callback_handler])
    chat = ChatOpenAI(
        max_tokens=MAX_TOKEN_COUNT,  # type: ignore[call-arg]
        streaming=True,
        temperature=0,
        callbacks=callback_manager,
        verbose=True,
        use_responses_api=use_responses_api,
    )
    message = HumanMessage(content="Hello")
    response = chat.invoke([message])
    assert callback_handler.llm_streams > 0
    assert isinstance(response, BaseMessage)


@pytest.mark.scheduled
def test_chat_openai_streaming_generation_info() -> None:
    """Test that generation info is preserved when streaming."""

    class _FakeCallback(FakeCallbackHandler):
        saved_things: dict = {}

        def on_llm_end(self, *args: Any, **kwargs: Any) -> Any:
            # Save the generation
            self.saved_things["generation"] = args[0]

    callback = _FakeCallback()
    callback_manager = CallbackManager([callback])
    chat = ChatOpenAI(max_tokens=2, temperature=0, callbacks=callback_manager)  # type: ignore[call-arg]
    list(chat.stream("hi"))
    generation = callback.saved_things["generation"]
    # `Hello!` is two tokens, assert that is what is returned
    assert generation.generations[0][0].text == "Hello!"


def test_chat_openai_llm_output_contains_model_name() -> None:
    """Test llm_output contains model_name."""
    chat = ChatOpenAI(max_tokens=MAX_TOKEN_COUNT)  # type: ignore[call-arg]
    message = HumanMessage(content="Hello")
    llm_result = chat.generate([[message]])
    assert llm_result.llm_output is not None
    assert llm_result.llm_output["model_name"] == chat.model_name


def test_chat_openai_streaming_llm_output_contains_model_name() -> None:
    """Test llm_output contains model_name."""
    chat = ChatOpenAI(max_tokens=MAX_TOKEN_COUNT, streaming=True)  # type: ignore[call-arg]
    message = HumanMessage(content="Hello")
    llm_result = chat.generate([[message]])
    assert llm_result.llm_output is not None
    assert llm_result.llm_output["model_name"] == chat.model_name


def test_chat_openai_invalid_streaming_params() -> None:
    """Test that streaming correctly invokes on_llm_new_token callback."""
    with pytest.raises(ValueError):
        ChatOpenAI(max_tokens=MAX_TOKEN_COUNT, streaming=True, temperature=0, n=5)  # type: ignore[call-arg]


@pytest.mark.scheduled
@pytest.mark.parametrize("use_responses_api", [False, True])
async def test_openai_abatch_tags(use_responses_api: bool) -> None:
    """Test batch tokens from ChatOpenAI."""
    llm = ChatOpenAI(max_tokens=MAX_TOKEN_COUNT, use_responses_api=use_responses_api)  # type: ignore[call-arg]

    result = await llm.abatch(
        ["I'm Pickle Rick", "I'm not Pickle Rick"], config={"tags": ["foo"]}
    )
    for token in result:
        assert isinstance(token.text, str)


@pytest.mark.flaky(retries=3, delay=1)
def test_openai_invoke() -> None:
    """Test invoke tokens from ChatOpenAI."""
    llm = ChatOpenAI(
        model="gpt-5-nano",
        service_tier="flex",  # Also test service_tier
        max_retries=3,  # Add retries for 503 capacity errors
    )

    result = llm.invoke("Hello", config={"tags": ["foo"]})
    assert isinstance(result.content, str)

    usage_metadata = result.usage_metadata  # type: ignore[attr-defined]

    # assert no response headers if include_response_headers is not set
    assert "headers" not in result.response_metadata
    assert usage_metadata is not None
    flex_input = usage_metadata.get("input_token_details", {}).get("flex")
    assert isinstance(flex_input, int)
    assert flex_input > 0
    assert flex_input == usage_metadata.get("input_tokens")
    flex_output = usage_metadata.get("output_token_details", {}).get("flex")
    assert isinstance(flex_output, int)
    assert flex_output > 0
    # GPT-5-nano/reasoning model specific. Remove if model used in test changes.
    flex_reasoning = usage_metadata.get("output_token_details", {}).get(
        "flex_reasoning"
    )
    assert isinstance(flex_reasoning, int)
    assert flex_reasoning > 0
    assert flex_reasoning + flex_output == usage_metadata.get("output_tokens")


@pytest.mark.flaky(retries=3, delay=1)
def test_stream() -> None:
    """Test streaming tokens from OpenAI."""
    llm = ChatOpenAI(
        model="gpt-5-nano",
        service_tier="flex",  # Also test service_tier
        max_retries=3,  # Add retries for 503 capacity errors
    )

    full: BaseMessageChunk | None = None
    for chunk in llm.stream("I'm Pickle Rick"):
        assert isinstance(chunk.content, str)
        full = chunk if full is None else full + chunk
    assert isinstance(full, AIMessageChunk)
    assert full.response_metadata.get("finish_reason") is not None
    assert full.response_metadata.get("model_name") is not None

    # check token usage
    aggregate: BaseMessageChunk | None = None
    chunks_with_token_counts = 0
    chunks_with_response_metadata = 0
    for chunk in llm.stream("Hello"):
        assert isinstance(chunk.content, str)
        aggregate = chunk if aggregate is None else aggregate + chunk
        assert isinstance(chunk, AIMessageChunk)
        if chunk.usage_metadata is not None:
            chunks_with_token_counts += 1
        if chunk.response_metadata and not set(chunk.response_metadata.keys()).issubset(
            {"model_provider", "output_version"}
        ):
            chunks_with_response_metadata += 1
    if chunks_with_token_counts != 1 or chunks_with_response_metadata != 1:
        msg = (
            "Expected exactly one chunk with metadata. "
            "AIMessageChunk aggregation can add these metadata. Check that "
            "this is behaving properly."
        )
        raise AssertionError(msg)
    assert isinstance(aggregate, AIMessageChunk)
    assert aggregate.usage_metadata is not None
    assert aggregate.usage_metadata["input_tokens"] > 0
    assert aggregate.usage_metadata["output_tokens"] > 0
    assert aggregate.usage_metadata["total_tokens"] > 0
    assert aggregate.usage_metadata.get("input_token_details", {}).get("flex", 0) > 0  # type: ignore[operator]
    assert aggregate.usage_metadata.get("output_token_details", {}).get("flex", 0) > 0  # type: ignore[operator]
    assert (
        aggregate.usage_metadata.get("output_token_details", {}).get(  # type: ignore[operator]
            "flex_reasoning", 0
        )
        > 0
    )
    assert aggregate.usage_metadata.get("output_token_details", {}).get(  # type: ignore[operator]
        "flex_reasoning", 0
    ) + aggregate.usage_metadata.get("output_token_details", {}).get(
        "flex", 0
    ) == aggregate.usage_metadata.get("output_tokens")


async def test_astream() -> None:
    """Test streaming tokens from OpenAI."""

    async def _test_stream(stream: AsyncIterator, expect_usage: bool) -> None:
        full: BaseMessageChunk | None = None
        chunks_with_token_counts = 0
        chunks_with_response_metadata = 0
        async for chunk in stream:
            assert isinstance(chunk.content, str)
            full = chunk if full is None else full + chunk
            assert isinstance(chunk, AIMessageChunk)
            if chunk.usage_metadata is not None:
                chunks_with_token_counts += 1
            if chunk.response_metadata and not set(
                chunk.response_metadata.keys()
            ).issubset({"model_provider", "output_version"}):
                chunks_with_response_metadata += 1
        assert isinstance(full, AIMessageChunk)
        if chunks_with_response_metadata != 1:
            msg = (
                "Expected exactly one chunk with metadata. "
                "AIMessageChunk aggregation can add these metadata. Check that "
                "this is behaving properly."
            )
            raise AssertionError(msg)
        assert full.response_metadata.get("finish_reason") is not None
        assert full.response_metadata.get("model_name") is not None
        if expect_usage:
            if chunks_with_token_counts != 1:
                msg = (
                    "Expected exactly one chunk with token counts. "
                    "AIMessageChunk aggregation adds counts. Check that "
                    "this is behaving properly."
                )
                raise AssertionError(msg)
            assert full.usage_metadata is not None
            assert full.usage_metadata["input_tokens"] > 0
            assert full.usage_metadata["output_tokens"] > 0
            assert full.usage_metadata["total_tokens"] > 0
        else:
            assert chunks_with_token_counts == 0
            assert full.usage_metadata is None

    llm = ChatOpenAI(model="gpt-4.1-mini", temperature=0, max_tokens=MAX_TOKEN_COUNT)  # type: ignore[call-arg]
    await _test_stream(llm.astream("Hello", stream_usage=False), expect_usage=False)
    await _test_stream(
        llm.astream("Hello", stream_options={"include_usage": True}), expect_usage=True
    )
    await _test_stream(llm.astream("Hello", stream_usage=True), expect_usage=True)
    llm = ChatOpenAI(
        model="gpt-4.1-mini",
        temperature=0,
        max_tokens=MAX_TOKEN_COUNT,  # type: ignore[call-arg]
        model_kwargs={"stream_options": {"include_usage": True}},
    )
    await _test_stream(llm.astream("Hello"), expect_usage=True)
    await _test_stream(
        llm.astream("Hello", stream_options={"include_usage": False}),
        expect_usage=False,
    )
    llm = ChatOpenAI(
        model="gpt-4.1-mini",
        temperature=0,
        max_tokens=MAX_TOKEN_COUNT,  # type: ignore[call-arg]
        stream_usage=True,
    )
    await _test_stream(llm.astream("Hello"), expect_usage=True)
    await _test_stream(llm.astream("Hello", stream_usage=False), expect_usage=False)


@pytest.mark.parametrize("streaming", [False, True])
def test_flex_usage_responses(streaming: bool) -> None:
    llm = ChatOpenAI(
        model="gpt-5-nano",
        service_tier="flex",
        max_retries=3,
        use_responses_api=True,
        streaming=streaming,
    )
    result = llm.invoke("Hello")
    assert result.usage_metadata
    flex_input = result.usage_metadata.get("input_token_details", {}).get("flex")
    flex_output = result.usage_metadata.get("output_token_details", {}).get("flex")
    flex_reasoning = result.usage_metadata.get("output_token_details", {}).get(
        "flex_reasoning"
    )
    assert isinstance(flex_input, int)
    assert isinstance(flex_output, int)
    assert isinstance(flex_reasoning, int)
    assert flex_output + flex_reasoning == result.usage_metadata.get("output_tokens")


async def test_abatch_tags() -> None:
    """Test batch tokens from ChatOpenAI."""
    llm = ChatOpenAI()

    result = await llm.abatch(
        ["I'm Pickle Rick", "I'm not Pickle Rick"], config={"tags": ["foo"]}
    )
    for token in result:
        assert isinstance(token.content, str)


def test_response_metadata() -> None:
    llm = ChatOpenAI()
    result = llm.invoke([HumanMessage(content="I'm PickleRick")], logprobs=True)
    assert result.response_metadata
    assert all(
        k in result.response_metadata
        for k in (
            "token_usage",
            "model_name",
            "logprobs",
            "system_fingerprint",
            "finish_reason",
            "service_tier",
        )
    )
    assert "content" in result.response_metadata["logprobs"]


async def test_async_response_metadata() -> None:
    llm = ChatOpenAI()
    result = await llm.ainvoke([HumanMessage(content="I'm PickleRick")], logprobs=True)
    assert result.response_metadata
    assert all(
        k in result.response_metadata
        for k in (
            "token_usage",
            "model_name",
            "logprobs",
            "system_fingerprint",
            "finish_reason",
            "service_tier",
        )
    )
    assert "content" in result.response_metadata["logprobs"]


def test_response_metadata_streaming() -> None:
    llm = ChatOpenAI()
    full: BaseMessageChunk | None = None
    for chunk in llm.stream("I'm Pickle Rick", logprobs=True):
        assert isinstance(chunk.content, str)
        full = chunk if full is None else full + chunk
    assert all(
        k in cast(BaseMessageChunk, full).response_metadata
        for k in ("logprobs", "finish_reason", "service_tier")
    )
    assert "content" in cast(BaseMessageChunk, full).response_metadata["logprobs"]


async def test_async_response_metadata_streaming() -> None:
    llm = ChatOpenAI()
    full: BaseMessageChunk | None = None
    async for chunk in llm.astream("I'm Pickle Rick", logprobs=True):
        assert isinstance(chunk.content, str)
        full = chunk if full is None else full + chunk
    assert all(
        k in cast(BaseMessageChunk, full).response_metadata
        for k in ("logprobs", "finish_reason", "service_tier")
    )
    assert "content" in cast(BaseMessageChunk, full).response_metadata["logprobs"]


class GenerateUsername(BaseModel):
    "Get a username based on someone's name and hair color."

    name: str
    hair_color: str


class MakeASandwich(BaseModel):
    "Make a sandwich given a list of ingredients."

    bread_type: str
    cheese_type: str
    condiments: list[str]
    vegetables: list[str]


def test_tool_use() -> None:
    llm = ChatOpenAI(model="gpt-5-nano", temperature=0)
    llm_with_tool = llm.bind_tools(tools=[GenerateUsername], tool_choice=True)
    msgs: list = [HumanMessage("Sally has green hair, what would her username be?")]
    ai_msg = llm_with_tool.invoke(msgs)

    assert isinstance(ai_msg, AIMessage)
    assert isinstance(ai_msg.tool_calls, list)
    assert len(ai_msg.tool_calls) == 1
    tool_call = ai_msg.tool_calls[0]
    assert "args" in tool_call

    tool_msg = ToolMessage("sally_green_hair", tool_call_id=ai_msg.tool_calls[0]["id"])
    msgs.extend([ai_msg, tool_msg])
    llm_with_tool.invoke(msgs)

    # Test streaming
    ai_messages = llm_with_tool.stream(msgs)
    first = True
    for message in ai_messages:
        if first:
            gathered = message
            first = False
        else:
            gathered = gathered + message  # type: ignore
    assert isinstance(gathered, AIMessageChunk)
    assert isinstance(gathered.tool_call_chunks, list)
    assert len(gathered.tool_call_chunks) == 1
    tool_call_chunk = gathered.tool_call_chunks[0]
    assert "args" in tool_call_chunk
    assert gathered.content_blocks == gathered.tool_calls

    streaming_tool_msg = ToolMessage(
        "sally_green_hair", tool_call_id=gathered.tool_calls[0]["id"]
    )
    msgs.extend([gathered, streaming_tool_msg])
    llm_with_tool.invoke(msgs)


@pytest.mark.parametrize("use_responses_api", [False, True])
def test_manual_tool_call_msg(use_responses_api: bool) -> None:
    """Test passing in manually construct tool call message."""
    llm = ChatOpenAI(
        model="gpt-5-nano", temperature=0, use_responses_api=use_responses_api
    )
    llm_with_tool = llm.bind_tools(tools=[GenerateUsername])
    msgs: list = [
        HumanMessage("Sally has green hair, what would her username be?"),
        AIMessage(
            content="",
            tool_calls=[
                ToolCall(
                    name="GenerateUsername",
                    args={"name": "Sally", "hair_color": "green"},
                    id="foo",
                    type="tool_call",
                )
            ],
        ),
        ToolMessage("sally_green_hair", tool_call_id="foo"),
    ]
    output: AIMessage = cast(AIMessage, llm_with_tool.invoke(msgs))
    assert output.content
    # Should not have called the tool again.
    assert not output.tool_calls
    assert not output.invalid_tool_calls

    # OpenAI should error when tool call id doesn't match across AIMessage and
    # ToolMessage
    msgs = [
        HumanMessage("Sally has green hair, what would her username be?"),
        AIMessage(
            content="",
            tool_calls=[
                ToolCall(
                    name="GenerateUsername",
                    args={"name": "Sally", "hair_color": "green"},
                    id="bar",
                    type="tool_call",
                )
            ],
        ),
        ToolMessage("sally_green_hair", tool_call_id="foo"),
    ]
    with pytest.raises(Exception):
        llm_with_tool.invoke(msgs)


@pytest.mark.parametrize("use_responses_api", [False, True])
def test_bind_tools_tool_choice(use_responses_api: bool) -> None:
    """Test passing in manually construct tool call message."""
    llm = ChatOpenAI(
        model="gpt-5-nano", temperature=0, use_responses_api=use_responses_api
    )
    for tool_choice in ("any", "required"):
        llm_with_tools = llm.bind_tools(
            tools=[GenerateUsername, MakeASandwich], tool_choice=tool_choice
        )
        msg = cast(AIMessage, llm_with_tools.invoke("how are you"))
        assert msg.tool_calls

    llm_with_tools = llm.bind_tools(tools=[GenerateUsername, MakeASandwich])
    msg = cast(AIMessage, llm_with_tools.invoke("how are you"))
    assert not msg.tool_calls


def test_disable_parallel_tool_calling() -> None:
    llm = ChatOpenAI(model="gpt-5-nano")
    llm_with_tools = llm.bind_tools([GenerateUsername], parallel_tool_calls=False)
    result = llm_with_tools.invoke(
        "Use the GenerateUsername tool to generate user names for:\n\n"
        "Sally with green hair\n"
        "Bob with blue hair"
    )
    assert isinstance(result, AIMessage)
    assert len(result.tool_calls) == 1


@pytest.mark.parametrize("model", ["gpt-4o-mini", "gpt-4.1-mini", "gpt-5-nano"])
def test_openai_structured_output(model: str) -> None:
    class MyModel(BaseModel):
        """A Person"""

        name: str
        age: int

    llm = ChatOpenAI(model=model).with_structured_output(MyModel)
    result = llm.invoke("I'm a 27 year old named Erick")
    assert isinstance(result, MyModel)
    assert result.name == "Erick"
    assert result.age == 27


def test_openai_proxy() -> None:
    """Test ChatOpenAI with proxy."""
    chat_openai = ChatOpenAI(openai_proxy="http://localhost:8080")
    mounts = chat_openai.client._client._client._mounts
    assert len(mounts) == 1
    for value in mounts.values():
        proxy = value._pool._proxy_url.origin
        assert proxy.scheme == b"http"
        assert proxy.host == b"localhost"
        assert proxy.port == 8080

    async_client_mounts = chat_openai.async_client._client._client._mounts
    assert len(async_client_mounts) == 1
    for value in async_client_mounts.values():
        proxy = value._pool._proxy_url.origin
        assert proxy.scheme == b"http"
        assert proxy.host == b"localhost"
        assert proxy.port == 8080


@pytest.mark.parametrize("use_responses_api", [False, True])
def test_openai_response_headers(use_responses_api: bool) -> None:
    """Test ChatOpenAI response headers."""
    chat_openai = ChatOpenAI(
        include_response_headers=True, use_responses_api=use_responses_api
    )
    query = "I'm Pickle Rick"
    result = chat_openai.invoke(query, max_tokens=MAX_TOKEN_COUNT)  # type: ignore[call-arg]
    headers = result.response_metadata["headers"]
    assert headers
    assert isinstance(headers, dict)
    assert "content-type" in headers

    # Stream
    full: BaseMessageChunk | None = None
    for chunk in chat_openai.stream(query, max_tokens=MAX_TOKEN_COUNT):  # type: ignore[call-arg]
        full = chunk if full is None else full + chunk
    assert isinstance(full, AIMessage)
    headers = full.response_metadata["headers"]
    assert headers
    assert isinstance(headers, dict)
    assert "content-type" in headers


@pytest.mark.parametrize("use_responses_api", [False, True])
async def test_openai_response_headers_async(use_responses_api: bool) -> None:
    """Test ChatOpenAI response headers."""
    chat_openai = ChatOpenAI(
        include_response_headers=True, use_responses_api=use_responses_api
    )
    query = "I'm Pickle Rick"
    result = await chat_openai.ainvoke(query, max_tokens=MAX_TOKEN_COUNT)  # type: ignore[call-arg]
    headers = result.response_metadata["headers"]
    assert headers
    assert isinstance(headers, dict)
    assert "content-type" in headers

    # Stream
    full: BaseMessageChunk | None = None
    async for chunk in chat_openai.astream(query, max_tokens=MAX_TOKEN_COUNT):  # type: ignore[call-arg]
        full = chunk if full is None else full + chunk
    assert isinstance(full, AIMessage)
    headers = full.response_metadata["headers"]
    assert headers
    assert isinstance(headers, dict)
    assert "content-type" in headers


def test_image_token_counting_jpeg() -> None:
    model = ChatOpenAI(model="gpt-4o", temperature=0)
    image_url = "https://raw.githubusercontent.com/langchain-ai/docs/9f99bb977307a1bd5efeb8dc6b67eb13904c4af1/src/oss/images/checkpoints.jpg"
    message = HumanMessage(
        content=[
            {"type": "text", "text": "describe the weather in this image"},
            {"type": "image_url", "image_url": {"url": image_url}},
        ]
    )
    expected = cast(AIMessage, model.invoke([message])).usage_metadata[  # type: ignore[index]
        "input_tokens"
    ]
    actual = model.get_num_tokens_from_messages([message])
    assert expected == actual

    image_data = base64.b64encode(httpx.get(image_url, timeout=10.0).content).decode(
        "utf-8"
    )
    message = HumanMessage(
        content=[
            {"type": "text", "text": "describe the weather in this image"},
            {
                "type": "image_url",
                "image_url": {"url": f"data:image/jpeg;base64,{image_data}"},
            },
        ]
    )
    expected = cast(AIMessage, model.invoke([message])).usage_metadata[  # type: ignore[index]
        "input_tokens"
    ]
    actual = model.get_num_tokens_from_messages([message])
    assert expected == actual


def test_image_token_counting_png() -> None:
    model = ChatOpenAI(model="gpt-4o", temperature=0)
    image_url = "https://raw.githubusercontent.com/langchain-ai/docs/4d11d08b6b0e210bd456943f7a22febbd168b543/src/images/agentic-rag-output.png"
    message = HumanMessage(
        content=[
            {"type": "text", "text": "how many dice are in this image"},
            {"type": "image_url", "image_url": {"url": image_url}},
        ]
    )
    expected = cast(AIMessage, model.invoke([message])).usage_metadata[  # type: ignore[index]
        "input_tokens"
    ]
    actual = model.get_num_tokens_from_messages([message])
    assert expected == actual

    image_data = base64.b64encode(httpx.get(image_url, timeout=10.0).content).decode(
        "utf-8"
    )
    message = HumanMessage(
        content=[
            {"type": "text", "text": "how many dice are in this image"},
            {
                "type": "image_url",
                "image_url": {"url": f"data:image/png;base64,{image_data}"},
            },
        ]
    )
    expected = cast(AIMessage, model.invoke([message])).usage_metadata[  # type: ignore[index]
        "input_tokens"
    ]
    actual = model.get_num_tokens_from_messages([message])
    assert expected == actual


@pytest.mark.parametrize("use_responses_api", [False, True])
@pytest.mark.parametrize(
    ("model", "method"),
    [("gpt-4.1-mini", "function_calling"), ("gpt-4.1-mini", "json_schema")],
)
def test_structured_output_strict(
    model: str,
    method: Literal["function_calling", "json_schema"],
    use_responses_api: bool,
) -> None:
    """Test to verify structured output with strict=True."""

    from pydantic import BaseModel as BaseModelProper
    from pydantic import Field as FieldProper

    llm = ChatOpenAI(model=model, use_responses_api=use_responses_api)

    class Joke(BaseModelProper):
        """Joke to tell user."""

        setup: str = FieldProper(description="question to set up a joke")
        punchline: str = FieldProper(description="answer to resolve the joke")

    # Pydantic class
    chat = llm.with_structured_output(Joke, method=method, strict=True)
    result = chat.invoke("Tell me a joke about cats.")
    assert isinstance(result, Joke)

    for chunk in chat.stream("Tell me a joke about cats."):
        assert isinstance(chunk, Joke)

    # Schema
    chat = llm.with_structured_output(
        Joke.model_json_schema(), method=method, strict=True
    )
    result = chat.invoke("Tell me a joke about cats.")
    assert isinstance(result, dict)
    assert set(result.keys()) == {"setup", "punchline"}

    for chunk in chat.stream("Tell me a joke about cats."):
        assert isinstance(chunk, dict)
    assert isinstance(chunk, dict)  # for mypy
    assert set(chunk.keys()) == {"setup", "punchline"}


@pytest.mark.parametrize("use_responses_api", [False, True])
@pytest.mark.parametrize(("model", "method"), [("gpt-4.1-mini", "json_schema")])
def test_nested_structured_output_strict(
    model: str, method: Literal["json_schema"], use_responses_api: bool
) -> None:
    """Test to verify structured output with strict=True for nested object."""

    from typing import TypedDict

    llm = ChatOpenAI(model=model, temperature=0, use_responses_api=use_responses_api)

    class SelfEvaluation(TypedDict):
        score: int
        text: str

    class JokeWithEvaluation(TypedDict):
        """Joke to tell user."""

        setup: str
        punchline: str
        self_evaluation: SelfEvaluation

    # Schema
    chat = llm.with_structured_output(JokeWithEvaluation, method=method, strict=True)
    result = chat.invoke("Tell me a joke about cats.")
    assert isinstance(result, dict)
    assert set(result.keys()) == {"setup", "punchline", "self_evaluation"}
    assert set(result["self_evaluation"].keys()) == {"score", "text"}

    for chunk in chat.stream("Tell me a joke about cats."):
        assert isinstance(chunk, dict)
    assert isinstance(chunk, dict)  # for mypy
    assert set(chunk.keys()) == {"setup", "punchline", "self_evaluation"}
    assert set(chunk["self_evaluation"].keys()) == {"score", "text"}


@pytest.mark.parametrize(
    ("strict", "method"),
    [
        (True, "json_schema"),
        (False, "json_schema"),
        (True, "function_calling"),
        (False, "function_calling"),
    ],
)
def test_json_schema_openai_format(
    strict: bool, method: Literal["json_schema", "function_calling"]
) -> None:
    """Test we can pass in OpenAI schema format specifying strict."""
    llm = ChatOpenAI(model="gpt-5-nano")
    schema = {
        "name": "get_weather",
        "description": "Fetches the weather in the given location",
        "strict": strict,
        "parameters": {
            "type": "object",
            "properties": {
                "location": {
                    "type": "string",
                    "description": "The location to get the weather for",
                },
                "unit": {
                    "type": "string",
                    "description": "The unit to return the temperature in",
                    "enum": ["F", "C"],
                },
            },
            "additionalProperties": False,
            "required": ["location", "unit"],
        },
    }
    chat = llm.with_structured_output(schema, method=method)
    result = chat.invoke("What is the weather in New York?")
    assert isinstance(result, dict)


def test_audio_output_modality() -> None:
    llm = ChatOpenAI(
        model="gpt-audio",
        temperature=0,
        model_kwargs={
            "modalities": ["text", "audio"],
            "audio": {"voice": "alloy", "format": "wav"},
        },
    )

    history: list[BaseMessage] = [
        HumanMessage("Make me a short audio clip of you yelling")
    ]

    output = llm.invoke(history)

    assert isinstance(output, AIMessage)
    assert "audio" in output.additional_kwargs

    history.append(output)
    history.append(HumanMessage("Make me a short audio clip of you whispering"))

    output = llm.invoke(history)

    assert isinstance(output, AIMessage)
    assert "audio" in output.additional_kwargs


def test_audio_input_modality() -> None:
    llm = ChatOpenAI(
        model="gpt-audio",
        temperature=0,
        model_kwargs={
            "modalities": ["text", "audio"],
            "audio": {"voice": "alloy", "format": "wav"},
        },
    )
    filepath = Path(__file__).parent / "audio_input.wav"

    audio_data = filepath.read_bytes()
    b64_audio_data = base64.b64encode(audio_data).decode("utf-8")

    history: list[BaseMessage] = [
        HumanMessage(
            [
                {"type": "text", "text": "What is happening in this audio clip"},
                {
                    "type": "input_audio",
                    "input_audio": {"data": b64_audio_data, "format": "wav"},
                },
            ]
        )
    ]

    output = llm.invoke(history)

    assert isinstance(output, AIMessage)
    assert "audio" in output.additional_kwargs

    history.append(output)
    history.append(HumanMessage("Why?"))

    output = llm.invoke(history)

    assert isinstance(output, AIMessage)
    assert "audio" in output.additional_kwargs


@pytest.mark.flaky(retries=3, delay=1)
def test_prediction_tokens() -> None:
    code = dedent(
        """
    /// <summary>
    /// Represents a user with a first name, last name, and username.
    /// </summary>
    public class User
    {
        /// <summary>
        /// Gets or sets the user's first name.
        /// </summary>
        public string FirstName { get; set; }

        /// <summary>
        /// Gets or sets the user's last name.
        /// </summary>
        public string LastName { get; set; }

        /// <summary>
        /// Gets or sets the user's username.
        /// </summary>
        public string Username { get; set; }
    }
    """
    )

    llm = ChatOpenAI(model="gpt-4.1-mini")
    query = (
        "Replace the Username property with an Email property. "
        "Respond only with code, and with no markdown formatting."
    )
    response = llm.invoke(
        [{"role": "user", "content": query}, {"role": "user", "content": code}],
        prediction={"type": "content", "content": code},
    )
    assert isinstance(response, AIMessage)
    assert response.response_metadata is not None
    output_token_details = response.response_metadata["token_usage"][
        "completion_tokens_details"
    ]
    assert output_token_details["accepted_prediction_tokens"] > 0
    assert output_token_details["rejected_prediction_tokens"] > 0


@pytest.mark.parametrize("use_responses_api", [False, True])
def test_stream_reasoning_model(use_responses_api: bool) -> None:
    list(
        ChatOpenAI(model="gpt-5-nano", use_responses_api=use_responses_api).stream(
            "how are you"
        )
    )


@pytest.mark.parametrize("use_responses_api", [False, True])
async def test_astream_reasoning_model(use_responses_api: bool) -> None:
    async for _ in ChatOpenAI(
        model="gpt-5-nano", use_responses_api=use_responses_api
    ).astream("how are you"):
        pass


class Foo(BaseModel):
    response: str


def test_stream_response_format() -> None:
    full: BaseMessageChunk | None = None
    chunks = []
    for chunk in ChatOpenAI(model="gpt-5-nano").stream(
        "how are ya", response_format=Foo
    ):
        chunks.append(chunk)
        full = chunk if full is None else full + chunk
    assert len(chunks) > 1
    assert isinstance(full, AIMessageChunk)
    parsed = full.additional_kwargs["parsed"]
    assert isinstance(parsed, Foo)
    assert isinstance(full.content, str)
    parsed_content = json.loads(full.content)
    assert parsed.response == parsed_content["response"]


async def test_astream_response_format() -> None:
    full: BaseMessageChunk | None = None
    chunks = []
    async for chunk in ChatOpenAI(model="gpt-5-nano").astream(
        "how are ya", response_format=Foo
    ):
        chunks.append(chunk)
        full = chunk if full is None else full + chunk
    assert len(chunks) > 1
    assert isinstance(full, AIMessageChunk)
    parsed = full.additional_kwargs["parsed"]
    assert isinstance(parsed, Foo)
    assert isinstance(full.content, str)
    parsed_content = json.loads(full.content)
    assert parsed.response == parsed_content["response"]


@pytest.mark.scheduled
def test_reasoning_model_stream_default_works() -> None:
    result = list(ChatOpenAI(model="gpt-5-nano").stream("say 'hi'"))
    assert len(result) > 0


def test_reasoning_effort_parameter() -> None:
    """Test that the standard `reasoning_effort` parameter is accepted by the API."""
    llm = ChatOpenAI(model="gpt-5-nano", reasoning_effort="low")

    result = llm.invoke("Say hello in one sentence")

    assert isinstance(result.content, str)
    assert len(result.content) > 0
    assert result.usage_metadata is not None
    assert result.usage_metadata["input_tokens"] > 0
    assert result.usage_metadata["output_tokens"] > 0


def test_reasoning_effort_call_time_kwarg() -> None:
    """Test that `reasoning_effort` is accepted as a call-time kwarg."""
    llm = ChatOpenAI(model="gpt-5-nano")

    result = llm.invoke("Say hello in one sentence", reasoning_effort="low")

    assert isinstance(result.content, str)
    assert len(result.content) > 0
    assert result.usage_metadata is not None


@pytest.mark.flaky(retries=3, delay=1)
def test_multi_party_conversation() -> None:
    llm = ChatOpenAI(model="gpt-5-nano")
    messages = [
        HumanMessage("Hi, I have black hair.", name="Alice"),
        HumanMessage("Hi, I have brown hair.", name="Bob"),
        HumanMessage("Who just spoke?", name="Charlie"),
    ]
    response = llm.invoke(messages)
    assert "Bob" in response.content


class ResponseFormat(BaseModel):
    response: str
    explanation: str


class ResponseFormatDict(TypedDict):
    response: str
    explanation: str


@pytest.mark.flaky(retries=3, delay=1)
@pytest.mark.parametrize(
    "schema", [ResponseFormat, ResponseFormat.model_json_schema(), ResponseFormatDict]
)
def test_structured_output_and_tools(schema: Any) -> None:
    llm = ChatOpenAI(model="gpt-5-nano", verbosity="low").bind_tools(
        [GenerateUsername], strict=True, response_format=schema
    )

    response = llm.invoke("What weighs more, a pound of feathers or a pound of gold?")
    if schema == ResponseFormat:
        parsed = response.additional_kwargs["parsed"]
        assert isinstance(parsed, ResponseFormat)
    else:
        parsed = json.loads(response.text)
        assert isinstance(parsed, dict)
        assert parsed["response"]
        assert parsed["explanation"]

    # Test streaming tool calls
    full: BaseMessageChunk | None = None
    for chunk in llm.stream(
        "Generate a user name for Alice, black hair. Use the tool."
    ):
        assert isinstance(chunk, AIMessageChunk)
        full = chunk if full is None else full + chunk
    assert isinstance(full, AIMessageChunk)
    assert len(full.tool_calls) == 1
    tool_call = full.tool_calls[0]
    assert tool_call["name"] == "GenerateUsername"


def test_tools_and_structured_output() -> None:
    llm = ChatOpenAI(model="gpt-5-nano").with_structured_output(
        ResponseFormat, strict=True, include_raw=True, tools=[GenerateUsername]
    )

    expected_keys = {"raw", "parsing_error", "parsed"}
    query = "Hello"
    tool_query = "Generate a user name for Alice, black hair. Use the tool."
    # Test invoke
    ## Engage structured output
    response = llm.invoke(query)
    assert isinstance(response["parsed"], ResponseFormat)
    ## Engage tool calling
    response_tools = llm.invoke(tool_query)
    ai_msg = response_tools["raw"]
    assert isinstance(ai_msg, AIMessage)
    assert ai_msg.tool_calls
    assert response_tools["parsed"] is None

    # Test stream
    aggregated: dict = {}
    for chunk in llm.stream(tool_query):
        assert isinstance(chunk, dict)
        assert all(key in expected_keys for key in chunk)
        aggregated = {**aggregated, **chunk}
    assert all(key in aggregated for key in expected_keys)
    assert isinstance(aggregated["raw"], AIMessage)
    assert aggregated["raw"].tool_calls
    assert aggregated["parsed"] is None


@pytest.mark.scheduled
def test_prompt_cache_key_invoke() -> None:
    """Test that `prompt_cache_key` works with invoke calls."""
    chat = ChatOpenAI(model="gpt-5-nano", max_completion_tokens=500)
    messages = [HumanMessage("Say hello")]

    # Test that invoke works with prompt_cache_key parameter
    response = chat.invoke(messages, prompt_cache_key="integration-test-v1")

    assert isinstance(response, AIMessage)
    assert isinstance(response.content, str)
    assert len(response.content) > 0

    # Test that subsequent call with same cache key also works
    response2 = chat.invoke(messages, prompt_cache_key="integration-test-v1")

    assert isinstance(response2, AIMessage)
    assert isinstance(response2.content, str)
    assert len(response2.content) > 0


@pytest.mark.scheduled
def test_prompt_cache_key_usage_methods_integration() -> None:
    """Integration test for `prompt_cache_key` usage methods."""
    messages = [HumanMessage("Say hi")]

    # Test keyword argument method
    chat = ChatOpenAI(model="gpt-5-nano", max_completion_tokens=10)
    response = chat.invoke(messages, prompt_cache_key="integration-test-v1")
    assert isinstance(response, AIMessage)
    assert isinstance(response.content, str)

    # Test model-level via model_kwargs
    chat_model_level = ChatOpenAI(
        model="gpt-5-nano",
        max_completion_tokens=10,
        model_kwargs={"prompt_cache_key": "integration-model-level-v1"},
    )
    response_model_level = chat_model_level.invoke(messages)
    assert isinstance(response_model_level, AIMessage)
    assert isinstance(response_model_level.content, str)


@pytest.mark.scheduled
@pytest.mark.flaky(retries=3, delay=1)
def test_explicit_prompt_cache_breakpoint_invoke() -> None:
    """Explicit cache breakpoints produce a cache read on a repeated prefix.

    Uses a long, stable prefix marked with a `prompt_cache_breakpoint` and
    `prompt_cache_options={"mode": "explicit"}`. The first invocation writes the
    cache and the second should read it back.
    """
    chat = ChatOpenAI(
        model="gpt-5.6-sol",
        max_completion_tokens=10,
        prompt_cache_options={"mode": "explicit"},
    )
    # A prefix long enough to exceed OpenAI's minimum cacheable prompt length.
    stable_prefix = "Stable, cacheable instructions and reference material. " * 400
    messages = [
        HumanMessage(
            content=[
                {
                    "type": "text",
                    "text": stable_prefix,
                    "prompt_cache_breakpoint": {"mode": "explicit"},
                },
                {"type": "text", "text": "Say hello."},
            ]
        )
    ]

    first = chat.invoke(messages)
    assert isinstance(first, AIMessage)

    second = chat.invoke(messages)
    assert isinstance(second, AIMessage)
    assert second.usage_metadata is not None
    cache_read = second.usage_metadata["input_token_details"].get("cache_read", 0)
    assert cache_read > 0


class BadModel(BaseModel):
    response: str

    @field_validator("response")
    @classmethod
    def validate_response(cls, v: str) -> str:
        if v != "bad":
            msg = 'response must be exactly "bad"'
            raise ValueError(msg)
        return v


# VCR can't handle parameterized tests
@pytest.mark.vcr
def test_schema_parsing_failures() -> None:
    llm = ChatOpenAI(model="gpt-5-nano", use_responses_api=False)
    try:
        llm.invoke("respond with good", response_format=BadModel)
    except Exception as e:
        assert e.response is not None  # type: ignore[attr-defined]
    else:
        raise AssertionError


# VCR can't handle parameterized tests
@pytest.mark.vcr
def test_schema_parsing_failures_responses_api() -> None:
    llm = ChatOpenAI(model="gpt-5-nano", use_responses_api=True)
    try:
        llm.invoke("respond with good", response_format=BadModel)
    except Exception as e:
        assert e.response is not None  # type: ignore[attr-defined]
    else:
        raise AssertionError


# VCR can't handle parameterized tests
@pytest.mark.vcr
async def test_schema_parsing_failures_async() -> None:
    llm = ChatOpenAI(model="gpt-5-nano", use_responses_api=False)
    try:
        await llm.ainvoke("respond with good", response_format=BadModel)
    except Exception as e:
        assert e.response is not None  # type: ignore[attr-defined]
    else:
        raise AssertionError


# VCR can't handle parameterized tests
@pytest.mark.vcr
async def test_schema_parsing_failures_responses_api_async() -> None:
    llm = ChatOpenAI(model="gpt-5-nano", use_responses_api=True)
    try:
        await llm.ainvoke("respond with good", response_format=BadModel)
    except Exception as e:
        assert e.response is not None  # type: ignore[attr-defined]
    else:
        raise AssertionError


class _Person(BaseModel):
    """A person with a name and age."""

    name: str = Field(description="The person's name")
    age: int = Field(description="The person's age in years")


@pytest.mark.vcr
def test_streaming_tool_call_v1_v2_parity() -> None:
    """`stream()` and `stream_events(version="v3")` agree on their final `AIMessage`.

    Both paths are invoked against the same HTTP response (the cassette's
    single recorded interaction, replayed for both calls via
    `allow_playback_repeats=True`). Any remaining divergence is a real
    library issue, not a difference between two LLM calls.
    """
    llm = ChatOpenAI(
        model="gpt-4o-mini",
        temperature=0,
        output_version="v1",
        stream_usage=False,
    )
    with_tool = llm.bind_tools([_Person], tool_choice="_Person")
    prompt = "Extract: Erick is 27 years old."

    v1: AIMessageChunk | None = None
    for chunk in with_tool.stream(prompt):
        assert isinstance(chunk, AIMessageChunk)
        v1 = chunk if v1 is None else v1 + chunk
    assert isinstance(v1, AIMessageChunk)

    stream = cast("ChatModelStream", with_tool.stream_events(prompt, version="v3"))
    events = list(stream)
    assert_valid_event_stream(events)
    v2 = stream.output
    assert isinstance(v2, AIMessage)

    assert v1.tool_calls == v2.tool_calls
    assert v1.invalid_tool_calls == v2.invalid_tool_calls
    assert v1.content_blocks == v2.content_blocks

    # `usage_metadata` top-level counts must match. The detail dicts
    # (`input_token_details`, `output_token_details`) survive in v1 but
    # are dropped by the bridge's `_to_protocol_usage` because
    # `langchain_protocol.UsageInfo` has no fields for them. Tracked
    # as a protocol-repo change; compare counts strictly for now.
    detail_keys = {"input_token_details", "output_token_details"}
    v1_usage = {
        k: v for k, v in (v1.usage_metadata or {}).items() if k not in detail_keys
    }
    v2_usage = {
        k: v for k, v in (v2.usage_metadata or {}).items() if k not in detail_keys
    }
    assert v1_usage == v2_usage

    # `response_metadata` must match exactly: the bridge passes the
    # provider's raw `finish_reason` through without normalization, so
    # OpenAI's `"stop"` on a forced tool call appears on both paths.
    assert v1.response_metadata == v2.response_metadata
