"""Unit tests for ChatFireworks."""

from __future__ import annotations

import logging
import os
from typing import Any
from unittest.mock import MagicMock

import httpx
import pytest
from fireworks import (
    AuthenticationError,
    BadRequestError,
    FireworksError,
    InternalServerError,
    RateLimitError,
)
from langchain_core.exceptions import ContextOverflowError
from langchain_core.messages import (
    AIMessage,
    AIMessageChunk,
    ChatMessage,
    HumanMessage,
    SystemMessage,
    ToolMessage,
)

from langchain_fireworks import ChatFireworks
from langchain_fireworks.chat_models import (
    _ALLOWED_CONTENT_PART_KEYS,
    FireworksContextOverflowError,
    _acompletion_with_retry,
    _completion_with_retry,
    _convert_chunk_to_message_chunk,
    _convert_dict_to_message,
    _convert_message_to_dict,
    _format_message_content,
    _sanitize_chat_completions_content,
    _update_token_usage,
    _usage_to_metadata,
)

MODEL_NAME = "accounts/fireworks/models/test-model"


def _make_model(**kwargs: Any) -> ChatFireworks:
    defaults: dict[str, Any] = {"model": MODEL_NAME, "api_key": "fake-key"}
    defaults.update(kwargs)
    return ChatFireworks(**defaults)  # type: ignore[arg-type]


def _api_error(cls: type, msg: str, status_code: int) -> Exception:
    """Construct a 1.x SDK `APIStatusError` subclass with a synthetic response.

    Stainless-generated SDK errors require `message`, `response`, and `body`,
    so this helper keeps the test setup readable.
    """
    request = httpx.Request("POST", "https://api.fireworks.ai/inference/v1")
    response = httpx.Response(status_code=status_code, request=request)
    return cls(msg, response=response, body=None)


_STREAM_CHUNKS: list[dict[str, Any]] = [
    {
        "choices": [{"delta": {"role": "assistant", "content": ""}, "index": 0}],
    },
    {
        "choices": [{"delta": {"content": "Hello"}, "index": 0}],
    },
    {
        "choices": [{"delta": {}, "finish_reason": "stop", "index": 0}],
    },
    # Final usage-only chunk (empty choices)
    {
        "choices": [],
        "usage": {"prompt_tokens": 5, "completion_tokens": 2, "total_tokens": 7},
    },
]


def test_fireworks_model_param() -> None:
    llm = ChatFireworks(model="foo", api_key="fake-key")  # type: ignore[arg-type]
    assert llm.model_name == "foo"
    assert llm.model == "foo"
    llm = ChatFireworks(model_name="foo", api_key="fake-key")  # type: ignore[call-arg, arg-type]
    assert llm.model_name == "foo"
    assert llm.model == "foo"


def test_convert_dict_to_message_with_reasoning_content() -> None:
    """Test that reasoning_content is correctly extracted from API response."""
    response_dict = {
        "role": "assistant",
        "content": "The answer is 42.",
        "reasoning_content": "Let me think about this step by step...",
    }

    message = _convert_dict_to_message(response_dict)

    assert isinstance(message, AIMessage)
    assert message.content == "The answer is 42."
    assert "reasoning_content" in message.additional_kwargs
    expected_reasoning = "Let me think about this step by step..."
    assert message.additional_kwargs["reasoning_content"] == expected_reasoning


def test_convert_dict_to_message_without_reasoning_content() -> None:
    """Test that messages without reasoning_content work correctly."""
    response_dict = {
        "role": "assistant",
        "content": "The answer is 42.",
    }

    message = _convert_dict_to_message(response_dict)

    assert isinstance(message, AIMessage)
    assert message.content == "The answer is 42."
    assert "reasoning_content" not in message.additional_kwargs


def test_metadata_versions() -> None:
    """Test that metadata reports the correct version info."""
    os.environ.setdefault("FIREWORKS_API_KEY", "fake-key")
    llm = ChatFireworks(model="accounts/fireworks/models/llama-v3-70b-instruct")
    assert llm.metadata is not None
    versions = llm.metadata["lc_versions"]
    assert "langchain-core" in versions
    assert "langchain-fireworks" in versions


def test_format_message_content_passthrough_string() -> None:
    """Plain string content is returned unchanged."""
    assert _format_message_content("hello") == "hello"


def test_sanitize_chat_completions_text_blocks_strips_id() -> None:
    """LangChain auto-generated `id` on text blocks must not reach the wire.

    Fireworks's chat completions schema rejects unknown keys on tool message
    content blocks (`Extra inputs are not permitted, ... [0].id`). A single
    text-only block also collapses to a plain string, since the Fireworks
    `content` union lists `str` first.
    """
    message = ToolMessage(
        content=[{"type": "text", "text": "foo", "id": "lc_abc123"}],
        tool_call_id="def456",
    )
    assert _convert_message_to_dict(message) == {
        "role": "tool",
        "content": "foo",
        "tool_call_id": "def456",
    }


def test_sanitize_chat_completions_content_passthrough_string() -> None:
    assert _sanitize_chat_completions_content("hello") == "hello"


def test_sanitize_chat_completions_content_passthrough_non_text_block() -> None:
    blocks = [{"type": "image_url", "image_url": {"url": "https://x/y.png"}}]
    assert _sanitize_chat_completions_content(blocks) == blocks


def test_sanitize_chat_completions_content_strips_anthropic_v1_index() -> None:
    """Reproduction for the Kimi-via-Fireworks 400 from cross-provider history.

    Anthropic-shaped AIMessage text blocks carry an `index` streaming-reassembly
    marker that Fireworks rejects as `Extra inputs are not permitted, field:
    'messages[N].content.list[ChatMessageContent][0].index'`. After sanitization
    the single text block collapses to a plain string, matching the first branch
    of Fireworks's `content` union.
    """
    blocks = [{"text": "hello", "type": "text", "index": 0}]

    assert _sanitize_chat_completions_content(blocks) == "hello"


def test_sanitize_chat_completions_content_strips_tool_use_extras() -> None:
    """Unknown keys on a `tool_use` block are stripped down to allowlisted keys.

    `_format_message_content` is the real guard against `tool_use` blocks on
    outbound messages — it drops them entirely. The sanitizer only enforces
    the per-block key allowlist; it does not validate `type` against
    Fireworks's content union, so the surviving `{"type": "tool_use"}` is not
    itself wire-valid. This test pins the key-stripping contract; wire
    validity of `tool_use` blocks is `_format_message_content`'s job.
    """
    blocks = [
        {
            "type": "tool_use",
            "id": "toolu_1",
            "name": "foo",
            "input": {},
            "caller": {"type": "direct"},
            "index": 0,
        }
    ]

    sanitized = _sanitize_chat_completions_content(blocks)

    assert sanitized == [{"type": "tool_use"}]


def test_sanitize_chat_completions_content_keeps_multi_block_list() -> None:
    """A multi-block list is not coerced to a string."""
    blocks = [
        {"type": "text", "text": "a", "index": 0},
        {"type": "text", "text": "b", "index": 1},
    ]

    assert _sanitize_chat_completions_content(blocks) == [
        {"type": "text", "text": "a"},
        {"type": "text", "text": "b"},
    ]


def test_sanitize_chat_completions_content_does_not_coerce_image_only() -> None:
    """Coercion to string is gated on a single `{type:text,text:str}` block."""
    blocks = [{"type": "image_url", "image_url": {"url": "https://x/y.png"}}]

    assert _sanitize_chat_completions_content(blocks) == blocks


def test_sanitize_does_not_coerce_when_text_is_non_string() -> None:
    """Coercion is gated on `text` being a `str` — non-string `text` stays a list.

    Without the `isinstance(..., str)` guard the gate would send a malformed
    payload (e.g. `content=123`) downstream, which is worse than letting
    Fireworks reject the list.
    """
    blocks = [{"type": "text", "text": 123}]

    assert _sanitize_chat_completions_content(blocks) == [{"type": "text", "text": 123}]


def test_sanitize_does_not_coerce_when_text_key_missing_after_strip() -> None:
    """After stripping, a `{"type":"text"}` block with no `text` is not coerced."""
    blocks = [{"type": "text", "index": 0}]

    assert _sanitize_chat_completions_content(blocks) == [{"type": "text"}]


def test_convert_human_message_with_anthropic_v1_blocks_is_wire_clean() -> None:
    """`HumanMessage` content also routes through the sanitizer end-to-end."""
    message = HumanMessage(
        content=[{"type": "text", "text": "hi", "index": 0}],
    )

    assert _convert_message_to_dict(message) == {"role": "user", "content": "hi"}


def test_convert_ai_message_with_anthropic_v1_blocks_is_wire_clean() -> None:
    """End-to-end: an AIMessage carrying Anthropic v1 markers serializes clean.

    Mirrors the actual payload that triggered the 400 in production (Fleet ran
    a Sonnet-started conversation through ChatFireworks/Kimi).
    """
    message = AIMessage(
        content=[
            {
                "text": (
                    "I don't have a direct Hex API integration available "
                    "as a built-in tool."
                ),
                "type": "text",
                "index": 0,
            }
        ],
    )

    assert _convert_message_to_dict(message) == {
        "role": "assistant",
        "content": (
            "I don't have a direct Hex API integration available as a built-in tool."
        ),
    }


def test_fireworks_sdk_request_layout_stable() -> None:
    """Fail loudly if `fireworks-ai` reshuffles its request TypedDict layout.

    The content-part allowlist (`_ALLOWED_CONTENT_PART_KEYS`) is derived from
    the SDK's stainless-generated TypedDict at import time. If a future SDK
    version renames the module, renames the class, or drops a key the
    sanitizer assumes is present, this test fails so the strip logic gets
    updated in the same PR as the `fireworks-ai` bump.
    """
    from typing import get_type_hints

    from fireworks.types.shared_params.chat_message import (
        ChatMessage as SDKChatMessage,
    )
    from fireworks.types.shared_params.chat_message import (
        ContentUnionMember1,
    )

    content_keys = set(get_type_hints(ContentUnionMember1))
    message_keys = set(get_type_hints(SDKChatMessage))

    assert "type" in content_keys, (
        "Fireworks SDK no longer exposes `type` on ContentUnionMember1; "
        "update `_allowed_content_part_keys` / the sanitizer."
    )
    assert "text" in content_keys
    assert {"role", "content"} <= message_keys
    # The sanitizer's allowlist must equal the SDK TypedDict's keys; this is
    # the actual production contract, not just the `type`/`text` spot-checks.
    assert frozenset(content_keys) == _ALLOWED_CONTENT_PART_KEYS


def test_format_message_content_translates_v1_image_block() -> None:
    """Canonical v1 image block is translated to OpenAI image_url + data URI."""
    blocks = [{"type": "image", "base64": "abc", "mime_type": "image/png"}]

    formatted = _format_message_content(blocks)

    assert formatted == [
        {"type": "image_url", "image_url": {"url": "data:image/png;base64,abc"}},
    ]


def test_format_message_content_translates_v0_base64_image_block() -> None:
    """v0 source_type='base64' image block is translated."""
    blocks = [
        {
            "type": "image",
            "source_type": "base64",
            "data": "qqq",
            "mime_type": "image/png",
        }
    ]

    formatted = _format_message_content(blocks)

    assert formatted == [
        {"type": "image_url", "image_url": {"url": "data:image/png;base64,qqq"}},
    ]


def test_format_message_content_passes_through_existing_image_url() -> None:
    """Already-OpenAI image_url blocks pass through unchanged."""
    blocks = [
        {"type": "image_url", "image_url": {"url": "https://example.com/y.png"}},
    ]

    formatted = _format_message_content(blocks)

    assert formatted == blocks


@pytest.mark.parametrize(
    "btype",
    [
        "tool_use",
        "thinking",
        "reasoning_content",
        "function_call",
        "code_interpreter_call",
    ],
)
def test_format_message_content_drops_unsupported_block_types(btype: str) -> None:
    """Block types not part of the OpenAI chat completions wire format are stripped."""
    blocks = [
        {"type": "text", "text": "visible"},
        {"type": btype, "foo": "bar"},
    ]

    formatted = _format_message_content(blocks)

    assert formatted == [{"type": "text", "text": "visible"}]


def test_format_message_content_preserves_order_around_dropped_blocks() -> None:
    """Surviving blocks keep their order when interleaved drops are removed."""
    blocks = [
        {"type": "text", "text": "before"},
        {"type": "thinking", "thinking": "..."},
        {"type": "image", "base64": "abc", "mime_type": "image/png"},
        {"type": "tool_use", "name": "t", "input": {}},
        {"type": "text", "text": "after"},
    ]

    formatted = _format_message_content(blocks)

    assert formatted == [
        {"type": "text", "text": "before"},
        {"type": "image_url", "image_url": {"url": "data:image/png;base64,abc"}},
        {"type": "text", "text": "after"},
    ]


def test_format_message_content_translates_v1_url_image_block() -> None:
    """v1 image block with a top-level URL maps to an OpenAI image_url block."""
    blocks = [{"type": "image", "url": "https://example.com/img.png"}]

    formatted = _format_message_content(blocks)

    assert formatted == [
        {"type": "image_url", "image_url": {"url": "https://example.com/img.png"}},
    ]


def test_format_message_content_translates_v0_url_image_block() -> None:
    """v0 source_type=url image block is translated."""
    blocks = [
        {
            "type": "image",
            "source_type": "url",
            "url": "https://example.com/v0.png",
        }
    ]

    formatted = _format_message_content(blocks)

    assert formatted == [
        {"type": "image_url", "image_url": {"url": "https://example.com/v0.png"}},
    ]


def test_format_message_content_translates_anthropic_source_base64_image() -> None:
    """Legacy Anthropic-shape image with base64 source maps to a data URI."""
    blocks = [
        {
            "type": "image",
            "source": {
                "type": "base64",
                "media_type": "image/png",
                "data": "abc",
            },
        }
    ]

    formatted = _format_message_content(blocks)

    assert formatted == [
        {"type": "image_url", "image_url": {"url": "data:image/png;base64,abc"}},
    ]


def test_format_message_content_translates_anthropic_source_url_image() -> None:
    """Legacy Anthropic-shape image with url source maps to image_url."""
    blocks = [
        {
            "type": "image",
            "source": {"type": "url", "url": "https://example.com/anthropic.png"},
        }
    ]

    formatted = _format_message_content(blocks)

    assert formatted == [
        {
            "type": "image_url",
            "image_url": {"url": "https://example.com/anthropic.png"},
        },
    ]


def test_format_message_content_translates_v1_audio_block() -> None:
    """v1 audio block is translated to OpenAI input_audio shape."""
    blocks = [{"type": "audio", "base64": "aGVsbG8=", "mime_type": "audio/wav"}]

    formatted = _format_message_content(blocks)

    assert formatted == [
        {"type": "input_audio", "input_audio": {"data": "aGVsbG8=", "format": "wav"}},
    ]


def test_format_message_content_translates_v1_file_block_base64() -> None:
    """v1 file block with base64 + filename maps to OpenAI file_data shape."""
    blocks = [
        {
            "type": "file",
            "base64": "JVBERi0=",
            "mime_type": "application/pdf",
            "filename": "x.pdf",
        }
    ]

    formatted = _format_message_content(blocks)

    assert formatted == [
        {
            "type": "file",
            "file": {
                "file_data": "data:application/pdf;base64,JVBERi0=",
                "filename": "x.pdf",
            },
        },
    ]


def test_convert_message_to_dict_translates_tool_message_image() -> None:
    """ToolMessage with a canonical image block lands as OpenAI image_url on the wire.

    Reproduces the failure mode where a tool that returns an image (e.g. a
    file-reader) hands back `content_blocks=[{"type": "image", ...}]` and the
    message round-trips into a Fireworks chat completions request.
    """
    tool_message = ToolMessage(
        content=[{"type": "image", "base64": "abc", "mime_type": "image/png"}],
        tool_call_id="call_1",
    )

    result = _convert_message_to_dict(tool_message)

    assert result == {
        "role": "tool",
        "content": [
            {"type": "image_url", "image_url": {"url": "data:image/png;base64,abc"}},
        ],
        "tool_call_id": "call_1",
    }


def test_convert_message_to_dict_translates_human_mixed_content() -> None:
    """HumanMessage with mixed text + image blocks translates correctly."""
    human_message = HumanMessage(
        content=[
            {"type": "text", "text": "what is this?"},
            {"type": "image", "base64": "xyz", "mime_type": "image/jpeg"},
        ]
    )

    result = _convert_message_to_dict(human_message)

    assert result == {
        "role": "user",
        "content": [
            {"type": "text", "text": "what is this?"},
            {
                "type": "image_url",
                "image_url": {"url": "data:image/jpeg;base64,xyz"},
            },
        ],
    }


def test_convert_message_to_dict_chat_message_uses_translator() -> None:
    """ChatMessage path also runs content through the formatter."""
    chat_message = ChatMessage(
        role="custom",
        content=[{"type": "image", "base64": "zz", "mime_type": "image/gif"}],
    )

    result = _convert_message_to_dict(chat_message)

    assert result == {
        "role": "custom",
        "content": [
            {"type": "image_url", "image_url": {"url": "data:image/gif;base64,zz"}},
        ],
    }


def test_convert_message_to_dict_string_content_unchanged() -> None:
    """String content on common message types passes through unmodified."""
    assert _convert_message_to_dict(HumanMessage(content="hi"))["content"] == "hi"
    assert _convert_message_to_dict(SystemMessage(content="sys"))["content"] == "sys"
    assert (
        _convert_message_to_dict(ToolMessage(content="r1", tool_call_id="t"))["content"]
        == "r1"
    )


def test_convert_message_to_dict_translates_system_list_content() -> None:
    """SystemMessage with list content is routed through the formatter."""
    system_message = SystemMessage(
        content=[
            {"type": "text", "text": "rules"},
            {"type": "thinking", "thinking": "drop me"},
        ]
    )

    result = _convert_message_to_dict(system_message)

    # `thinking` is dropped by `_format_message_content`; the lone text block
    # is coerced to a plain string by `_sanitize_chat_completions_content`
    # since Fireworks's `content` union lists `str` as its first branch.
    assert result == {
        "role": "system",
        "content": "rules",
    }


def test_convert_message_to_dict_translates_ai_message_image_content() -> None:
    """AIMessage with a canonical image block is translated, not forwarded raw."""
    ai_message = AIMessage(
        content=[
            {"type": "text", "text": "see attached"},
            {"type": "image", "base64": "abc", "mime_type": "image/png"},
        ]
    )

    result = _convert_message_to_dict(ai_message)

    assert result == {
        "role": "assistant",
        "content": [
            {"type": "text", "text": "see attached"},
            {"type": "image_url", "image_url": {"url": "data:image/png;base64,abc"}},
        ],
    }


def test_convert_message_to_dict_propagates_translator_value_error() -> None:
    """Translator errors surface to callers instead of shipping bad payloads.

    Chat completions does not support file URLs; the translator raises rather
    than letting an unsupported block through.
    """
    bad_message = HumanMessage(
        content=[{"type": "file", "url": "https://example.com/doc.pdf"}]
    )

    with pytest.raises(ValueError, match="file URLs"):
        _convert_message_to_dict(bad_message)


def _make_llm(max_retries: int | None = 2) -> ChatFireworks:
    return ChatFireworks(
        model="accounts/fireworks/models/test",
        api_key="fake-key",  # type: ignore[arg-type]
        max_retries=max_retries,
    )


def _success_response() -> dict[str, Any]:
    return {
        "choices": [
            {
                "message": {"role": "assistant", "content": "hello"},
                "finish_reason": "stop",
            }
        ],
        "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2},
    }


@pytest.fixture(autouse=True)
def _no_retry_sleep(monkeypatch: pytest.MonkeyPatch) -> None:
    """Avoid tenacity's exponential backoff in tests."""
    import asyncio
    import time

    monkeypatch.setattr(time, "sleep", lambda _s: None)

    async def _no_async_sleep(_s: float) -> None:
        return None

    monkeypatch.setattr(asyncio, "sleep", _no_async_sleep)


def test_completion_with_retry_retries_on_retryable_error() -> None:
    """Retryable errors trigger retries up to the configured limit."""
    llm = _make_llm(max_retries=2)
    mock_client = MagicMock()
    mock_client.create.side_effect = [
        _api_error(RateLimitError, "rate limited", 429),
        _api_error(InternalServerError, "unavailable", 503),
        _success_response(),
    ]
    llm.client = mock_client

    result = _completion_with_retry(llm, messages=[])

    assert result == _success_response()
    assert mock_client.create.call_count == 3


def test_completion_with_retry_does_not_retry_non_retryable() -> None:
    """Non-retryable errors propagate after a single attempt."""
    llm = _make_llm(max_retries=3)
    mock_client = MagicMock()
    mock_client.create.side_effect = _api_error(AuthenticationError, "bad key", 401)
    llm.client = mock_client

    with pytest.raises(AuthenticationError):
        _completion_with_retry(llm, messages=[])

    assert mock_client.create.call_count == 1


def test_completion_with_retry_respects_max_retries_none() -> None:
    """`max_retries=None` disables retries."""
    llm = _make_llm(max_retries=None)
    mock_client = MagicMock()
    mock_client.create.side_effect = _api_error(RateLimitError, "rate limited", 429)
    llm.client = mock_client

    with pytest.raises(RateLimitError):
        _completion_with_retry(llm, messages=[])

    assert mock_client.create.call_count == 1


def test_completion_with_retry_exhausts_and_raises() -> None:
    """When every attempt fails, the last error is re-raised."""
    llm = _make_llm(max_retries=2)
    mock_client = MagicMock()
    mock_client.create.side_effect = _api_error(RateLimitError, "rate limited", 429)
    llm.client = mock_client

    with pytest.raises(RateLimitError):
        _completion_with_retry(llm, messages=[])

    # 1 initial attempt + 2 retries = 3 total attempts
    assert mock_client.create.call_count == 3


def test_completion_with_retry_streaming_retries_on_setup() -> None:
    """Streaming errors raised during the first-chunk pull are retried."""
    llm = _make_llm(max_retries=1)

    calls = {"n": 0}

    def _fail_then_stream(**_kwargs: Any) -> Any:
        calls["n"] += 1
        if calls["n"] == 1:

            def _failing_gen() -> Any:
                msg = "rate limited"
                raise _api_error(RateLimitError, msg, 429)
                yield  # pragma: no cover

            return _failing_gen()

        def _good_gen() -> Any:
            yield {"id": 0, "choices": [{"delta": {"content": "one"}}]}
            yield {"id": 1, "choices": [{"delta": {"content": "two"}}]}

        return _good_gen()

    mock_client = MagicMock()
    mock_client.create.side_effect = _fail_then_stream
    llm.client = mock_client

    chunks = list(_completion_with_retry(llm, messages=[], stream=True))

    # First chunk is preserved and in order — guards `_prepend_chunk` regression
    assert [c["id"] for c in chunks] == [0, 1]
    assert calls["n"] == 2


def test_completion_with_retry_streaming_accepts_iterable_only_result() -> None:
    """Streaming setup accepts iterable-only custom client wrappers."""

    class _IterableOnlyStream:
        def __iter__(self) -> Any:
            yield {"id": 0, "choices": [{"delta": {"content": "one"}}]}
            yield {"id": 1, "choices": [{"delta": {"content": "two"}}]}

    llm = _make_llm(max_retries=0)
    mock_client = MagicMock()
    mock_client.create.return_value = _IterableOnlyStream()
    llm.client = mock_client

    chunks = list(_completion_with_retry(llm, messages=[], stream=True))

    assert [c["id"] for c in chunks] == [0, 1]
    assert mock_client.create.call_count == 1


def test_completion_with_retry_retries_on_5xx_http_status_error() -> None:
    """5xx `httpx.HTTPStatusError` is promoted and retried."""
    llm = _make_llm(max_retries=1)
    mock_client = MagicMock()
    response_504 = httpx.Response(status_code=504, request=httpx.Request("POST", "x"))
    mock_client.create.side_effect = [
        httpx.HTTPStatusError(
            "504", request=response_504.request, response=response_504
        ),
        _success_response(),
    ]
    llm.client = mock_client

    result = _completion_with_retry(llm, messages=[])

    assert result == _success_response()
    assert mock_client.create.call_count == 2


def test_completion_with_retry_does_not_retry_on_4xx_http_status_error() -> None:
    """Non-5xx `httpx.HTTPStatusError` passes through unretried."""
    llm = _make_llm(max_retries=3)
    mock_client = MagicMock()
    response_422 = httpx.Response(status_code=422, request=httpx.Request("POST", "x"))
    mock_client.create.side_effect = httpx.HTTPStatusError(
        "422", request=response_422.request, response=response_422
    )
    llm.client = mock_client

    with pytest.raises(httpx.HTTPStatusError):
        _completion_with_retry(llm, messages=[])
    assert mock_client.create.call_count == 1


def test_completion_with_retry_retries_on_timeout_exception() -> None:
    """`httpx.TimeoutException` is in the retryable set."""
    llm = _make_llm(max_retries=1)
    mock_client = MagicMock()
    mock_client.create.side_effect = [
        httpx.ConnectTimeout("slow"),
        _success_response(),
    ]
    llm.client = mock_client

    result = _completion_with_retry(llm, messages=[])

    assert result == _success_response()
    assert mock_client.create.call_count == 2


def test_completion_with_retry_max_retries_zero_is_single_attempt() -> None:
    """`max_retries=0` disables retries (same as `None`)."""
    llm = _make_llm(max_retries=0)
    mock_client = MagicMock()
    mock_client.create.side_effect = _api_error(RateLimitError, "rate limited", 429)
    llm.client = mock_client

    with pytest.raises(RateLimitError):
        _completion_with_retry(llm, messages=[])
    assert mock_client.create.call_count == 1


def test_completion_with_retry_raises_on_empty_stream() -> None:
    """Empty streams surface as a descriptive `FireworksError`."""
    llm = _make_llm(max_retries=0)
    mock_client = MagicMock()

    def _empty_gen(**_kwargs: Any) -> Any:
        if False:
            yield  # pragma: no cover
        return

    mock_client.create.side_effect = _empty_gen
    llm.client = mock_client

    with pytest.raises(FireworksError, match="empty stream"):
        list(_completion_with_retry(llm, messages=[], stream=True))


def test_chat_fireworks_invoke_routes_through_retry() -> None:
    """`.invoke()` end-to-end exercises the retry helper on `self.client.create`.

    Guards against a regression that bypasses `_completion_with_retry` from
    `_generate`.
    """
    llm = _make_llm(max_retries=2)
    mock_client = MagicMock()
    mock_client.create.side_effect = [
        _api_error(RateLimitError, "rate limited", 429),
        _success_response(),
    ]
    llm.client = mock_client

    result = llm.invoke("hello")

    assert isinstance(result, AIMessage)
    assert result.content == "hello"
    assert mock_client.create.call_count == 2


async def test_acompletion_with_retry_streaming_retries_on_setup() -> None:
    """Async streaming errors during the first-chunk pull are retried."""
    llm = _make_llm(max_retries=1)
    calls = {"n": 0}

    async def _create(**_kwargs: Any) -> Any:
        calls["n"] += 1
        if calls["n"] == 1:

            async def _failing_agen() -> Any:
                msg = "rate limited"
                raise _api_error(RateLimitError, msg, 429)
                yield  # pragma: no cover

            return _failing_agen()

        async def _good_agen() -> Any:
            yield {"id": 0, "choices": [{"delta": {"content": "one"}}]}
            yield {"id": 1, "choices": [{"delta": {"content": "two"}}]}

        return _good_agen()

    mock_async = MagicMock()
    mock_async.create = _create
    llm.async_client = mock_async

    agen = await _acompletion_with_retry(llm, messages=[], stream=True)
    chunks = [c async for c in agen]

    assert [c["id"] for c in chunks] == [0, 1]
    assert calls["n"] == 2


async def test_acompletion_with_retry_streaming_accepts_async_iterable_only_result() -> (  # noqa: E501
    None
):
    """Async streaming setup accepts async-iterable-only custom wrappers."""

    class _AsyncIterableOnlyStream:
        def __aiter__(self) -> Any:
            async def _aiter() -> Any:
                yield {"id": 0, "choices": [{"delta": {"content": "one"}}]}
                yield {"id": 1, "choices": [{"delta": {"content": "two"}}]}

            return _aiter()

    llm = _make_llm(max_retries=0)
    mock_async = MagicMock()

    async def _create(**_kwargs: Any) -> Any:
        return _AsyncIterableOnlyStream()

    mock_async.create = MagicMock(side_effect=_create)
    llm.async_client = mock_async

    agen = await _acompletion_with_retry(llm, messages=[], stream=True)
    chunks = [c async for c in agen]

    assert [c["id"] for c in chunks] == [0, 1]
    assert mock_async.create.call_count == 1


async def test_achat_fireworks_ainvoke_routes_through_retry() -> None:
    """`.ainvoke()` end-to-end exercises the async retry helper."""
    llm = _make_llm(max_retries=2)
    calls = {"n": 0}

    async def _create(**_kwargs: Any) -> dict[str, Any]:
        calls["n"] += 1
        if calls["n"] == 1:
            msg = "rate limited"
            raise _api_error(RateLimitError, msg, 429)
        return _success_response()

    mock_async = MagicMock()
    mock_async.create = _create
    llm.async_client = mock_async

    result = await llm.ainvoke("hello")
    assert isinstance(result, AIMessage)
    assert result.content == "hello"
    assert calls["n"] == 2


async def test_acompletion_with_retry_retries_on_retryable_error() -> None:
    """Async retries on retryable errors up to the configured limit."""
    llm = _make_llm(max_retries=2)
    mock_async = MagicMock()

    call_count = {"n": 0}

    async def _create(**_kwargs: Any) -> dict[str, Any]:
        call_count["n"] += 1
        if call_count["n"] < 3:
            msg = "rate limited"
            raise _api_error(RateLimitError, msg, 429)
        return _success_response()

    mock_async.create = _create
    llm.async_client = mock_async

    result = await _acompletion_with_retry(llm, messages=[])
    assert result == _success_response()
    assert call_count["n"] == 3


async def test_acompletion_with_retry_does_not_retry_non_retryable() -> None:
    """Async does not retry non-retryable errors."""
    llm = _make_llm(max_retries=3)
    mock_async = MagicMock()
    call_count = {"n": 0}

    async def _create(**_kwargs: Any) -> dict[str, Any]:
        call_count["n"] += 1
        msg = "bad input"
        raise _api_error(BadRequestError, msg, 400)

    mock_async.create = _create
    llm.async_client = mock_async

    with pytest.raises(BadRequestError):
        await _acompletion_with_retry(llm, messages=[HumanMessage(content="hi")])
    assert call_count["n"] == 1


async def test_acompletion_with_retry_retries_on_5xx_http_status_error() -> None:
    """Async 5xx `httpx.HTTPStatusError` is promoted and retried."""
    llm = _make_llm(max_retries=1)
    call_count = {"n": 0}
    response_504 = httpx.Response(status_code=504, request=httpx.Request("POST", "x"))

    async def _create(**_kwargs: Any) -> dict[str, Any]:
        call_count["n"] += 1
        if call_count["n"] == 1:
            msg = "504"
            raise httpx.HTTPStatusError(
                msg, request=response_504.request, response=response_504
            )
        return _success_response()

    mock_async = MagicMock()
    mock_async.create = _create
    llm.async_client = mock_async

    result = await _acompletion_with_retry(llm, messages=[])
    assert result == _success_response()
    assert call_count["n"] == 2


async def test_acompletion_with_retry_raises_on_empty_stream() -> None:
    """Async empty streams surface as a descriptive `FireworksError`."""
    llm = _make_llm(max_retries=0)

    async def _create(**_kwargs: Any) -> Any:
        async def _empty_agen() -> Any:
            if False:
                yield  # pragma: no cover
            return

        return _empty_agen()

    mock_async = MagicMock()
    mock_async.create = _create
    llm.async_client = mock_async

    with pytest.raises(FireworksError, match="empty stream"):
        agen = await _acompletion_with_retry(llm, messages=[], stream=True)
        async for _ in agen:
            pass


def test_completion_with_retry_retries_on_transport_error() -> None:
    """`httpx.TransportError` is in the retryable set."""
    llm = _make_llm(max_retries=1)
    mock_client = MagicMock()
    mock_client.create.side_effect = [
        httpx.ConnectError("refused"),
        _success_response(),
    ]
    llm.client = mock_client

    result = _completion_with_retry(llm, messages=[])

    assert result == _success_response()
    assert mock_client.create.call_count == 2


class TestUsageToMetadata:
    """Tests for the `_usage_to_metadata` helper."""

    def test_all_fields_present(self) -> None:
        result = _usage_to_metadata(
            {"prompt_tokens": 10, "completion_tokens": 5, "total_tokens": 15}
        )
        assert result == {"input_tokens": 10, "output_tokens": 5, "total_tokens": 15}

    def test_total_tokens_fallback_sums_input_and_output(self) -> None:
        """When provider omits total_tokens, sum input + output."""
        result = _usage_to_metadata({"prompt_tokens": 7, "completion_tokens": 3})
        assert result == {"input_tokens": 7, "output_tokens": 3, "total_tokens": 10}

    def test_missing_fields_default_to_zero(self) -> None:
        result = _usage_to_metadata({})
        assert result == {"input_tokens": 0, "output_tokens": 0, "total_tokens": 0}

    def test_explicit_none_fields_coerced_to_zero(self) -> None:
        """Provider may send explicit `None` values; coerce them to `0`.

        Guards the `or`-based fallbacks against a `.get(key, default)` regression,
        which would preserve `None` for a present-but-null key.
        """
        result = _usage_to_metadata(
            {
                "prompt_tokens": None,
                "completion_tokens": None,
                "total_tokens": None,
            }
        )
        assert result == {"input_tokens": 0, "output_tokens": 0, "total_tokens": 0}

    def test_total_tokens_falls_back_to_sum_when_none(self) -> None:
        """A null `total_tokens` falls back to `input + output`."""
        result = _usage_to_metadata(
            {"prompt_tokens": 7, "completion_tokens": 3, "total_tokens": None}
        )
        assert result == {"input_tokens": 7, "output_tokens": 3, "total_tokens": 10}

    def test_cached_prompt_tokens_mapped_to_cache_read(self) -> None:
        result = _usage_to_metadata(
            {
                "prompt_tokens": 10,
                "completion_tokens": 5,
                "total_tokens": 15,
                "prompt_tokens_details": {"cached_tokens": 7},
            }
        )
        assert result == {
            "input_tokens": 10,
            "output_tokens": 5,
            "total_tokens": 15,
            "input_token_details": {"cache_read": 7},
        }

    def test_cached_tokens_zero_preserved(self) -> None:
        """A genuine `0` cache hit is reported, not dropped.

        Guards the `is not None` check against a truthiness (`if cached_tokens:`)
        regression that would silently omit `cache_read` for a real zero.
        """
        result = _usage_to_metadata(
            {
                "prompt_tokens": 10,
                "completion_tokens": 5,
                "total_tokens": 15,
                "prompt_tokens_details": {"cached_tokens": 0},
            }
        )
        assert result["input_token_details"] == {"cache_read": 0}

    def test_prompt_tokens_details_without_cached_tokens_omits_detail(self) -> None:
        """A details dict lacking (or nulling) `cached_tokens` adds no detail."""
        assert "input_token_details" not in _usage_to_metadata(
            {"prompt_tokens": 5, "prompt_tokens_details": {}}
        )
        assert "input_token_details" not in _usage_to_metadata(
            {"prompt_tokens": 5, "prompt_tokens_details": {"cached_tokens": None}}
        )


class TestCombineLLMOutputs:
    """Tests for combining raw provider token usage across generations."""

    def test_combines_nested_token_usage(self) -> None:
        model = _make_model()
        result = model._combine_llm_outputs(
            [
                {
                    "token_usage": {
                        "prompt_tokens": 32,
                        "completion_tokens": 51,
                        "total_tokens": 83,
                        "prompt_tokens_details": {"cached_tokens": 0},
                    },
                    "system_fingerprint": "fp-1",
                },
                {
                    "token_usage": {
                        "prompt_tokens": 44341,
                        "completion_tokens": 10,
                        "total_tokens": 44351,
                        "prompt_tokens_details": {"cached_tokens": 41518},
                    },
                },
            ]
        )
        assert result == {
            "token_usage": {
                "prompt_tokens": 44373,
                "completion_tokens": 61,
                "total_tokens": 44434,
                "prompt_tokens_details": {"cached_tokens": 41518},
            },
            "model_name": MODEL_NAME,
            "system_fingerprint": "fp-1",
        }

    def test_preserves_prior_nested_token_usage_keys(self) -> None:
        model = _make_model()
        result = model._combine_llm_outputs(
            [
                {
                    "token_usage": {
                        "prompt_tokens_details": {
                            "audio_tokens": 4,
                            "cached_tokens": 8,
                        },
                    },
                },
                {
                    "token_usage": {
                        "prompt_tokens_details": {
                            "audio_tokens": 6,
                        },
                    },
                },
                {
                    "token_usage": {
                        "prompt_tokens_details": {
                            "cached_tokens": None,
                        },
                    },
                },
            ]
        )

        assert result["token_usage"] == {
            "prompt_tokens_details": {
                "audio_tokens": 10,
                "cached_tokens": 8,
            },
        }

    def test_skips_none_token_usage_values(self) -> None:
        model = _make_model()
        result = model._combine_llm_outputs(
            [
                {"token_usage": {"prompt_tokens_details": None}},
                {
                    "token_usage": {
                        "prompt_tokens_details": {"cached_tokens": 8},
                    }
                },
            ]
        )
        assert result["token_usage"] == {"prompt_tokens_details": {"cached_tokens": 8}}

    def test_skips_none_streaming_outputs(self) -> None:
        """`None` entries (produced during streaming) are skipped, not dereferenced."""
        model = _make_model()
        result = model._combine_llm_outputs(
            [None, {"token_usage": {"prompt_tokens": 5, "total_tokens": 5}}, None]
        )
        assert result["token_usage"] == {"prompt_tokens": 5, "total_tokens": 5}


class TestUpdateTokenUsage:
    """Tests for the recursive `_update_token_usage` merge helper.

    The type-mismatch and unexpected-type branches are unreachable with today's
    stable Fireworks payloads, so they are exercised directly here to lock in the
    behavior: mismatches raise, while a wholly unexpected leaf type is logged and
    passed through rather than failing the response.
    """

    def test_int_accumulator_with_dict_value_raises(self) -> None:
        with pytest.raises(ValueError, match="Got different types for token usage"):
            _update_token_usage(5, {"cached_tokens": 1})

    def test_dict_accumulator_with_int_value_raises(self) -> None:
        with pytest.raises(ValueError, match="Got different types for token usage"):
            _update_token_usage({"cached_tokens": 1}, 5)

    def test_unexpected_value_type_warns_and_passes_through(
        self, caplog: pytest.LogCaptureFixture
    ) -> None:
        with caplog.at_level(logging.WARNING):
            result = _update_token_usage(0, 1.5)  # type: ignore[arg-type]
        assert result == 1.5
        assert "Unexpected type for token usage" in caplog.text

    def test_first_seen_nested_dict_value_merges(self) -> None:
        """A first-seen nested `dict` node seeds as a dict instead of raising."""
        result = _update_token_usage(
            {"details": {"a": 1}},
            {"details": {"a": 2, "nested": {"b": 3}}},
        )
        assert result == {"details": {"a": 3, "nested": {"b": 3}}}


class TestConvertChunkToMessageChunk:
    """Tests for `_convert_chunk_to_message_chunk` empty-choices handling."""

    def test_empty_choices_with_usage_returns_usage_chunk(self) -> None:
        chunk = {
            "choices": [],
            "usage": {"prompt_tokens": 4, "completion_tokens": 1, "total_tokens": 5},
        }
        result = _convert_chunk_to_message_chunk(chunk, AIMessageChunk)
        assert isinstance(result, AIMessageChunk)
        assert result.content == ""
        assert result.usage_metadata == {
            "input_tokens": 4,
            "output_tokens": 1,
            "total_tokens": 5,
        }

    def test_empty_choices_without_usage_logs_and_returns_blank(
        self, caplog: pytest.LogCaptureFixture
    ) -> None:
        chunk: dict[str, Any] = {"choices": []}
        with caplog.at_level("DEBUG", logger="langchain_fireworks.chat_models"):
            result = _convert_chunk_to_message_chunk(chunk, AIMessageChunk)
        assert isinstance(result, AIMessageChunk)
        assert result.content == ""
        assert result.usage_metadata is None
        assert any("no choices and no usage" in rec.message for rec in caplog.records)

    def test_missing_choices_key_treated_as_empty(self) -> None:
        """Provider may omit `choices` entirely on the final usage frame."""
        chunk = {
            "usage": {"prompt_tokens": 1, "completion_tokens": 2, "total_tokens": 3},
        }
        result = _convert_chunk_to_message_chunk(chunk, AIMessageChunk)
        assert isinstance(result, AIMessageChunk)
        assert result.usage_metadata == {
            "input_tokens": 1,
            "output_tokens": 2,
            "total_tokens": 3,
        }

    def test_usage_chunk_maps_cached_prompt_tokens(self) -> None:
        chunk = {
            "choices": [],
            "usage": {
                "prompt_tokens": 10,
                "completion_tokens": 2,
                "total_tokens": 12,
                "prompt_tokens_details": {"cached_tokens": 6},
            },
        }
        result = _convert_chunk_to_message_chunk(chunk, AIMessageChunk)
        assert isinstance(result, AIMessageChunk)
        assert result.usage_metadata == {
            "input_tokens": 10,
            "output_tokens": 2,
            "total_tokens": 12,
            "input_token_details": {"cache_read": 6},
        }


class TestCreateChatResult:
    """Tests for converting Fireworks responses into chat generations."""

    def test_maps_cached_prompt_tokens_to_message_usage_metadata(self) -> None:
        model = _make_model()
        chat_result = model._create_chat_result(
            {
                "choices": [
                    {
                        "message": {"role": "assistant", "content": "ok"},
                        "finish_reason": "stop",
                    }
                ],
                "usage": {
                    "prompt_tokens": 20,
                    "completion_tokens": 3,
                    "total_tokens": 23,
                    "prompt_tokens_details": {"cached_tokens": 11},
                },
            }
        )
        message = chat_result.generations[0].message
        assert isinstance(message, AIMessage)
        assert message.usage_metadata == {
            "input_tokens": 20,
            "output_tokens": 3,
            "total_tokens": 23,
            "input_token_details": {"cache_read": 11},
        }


class TestExtraHeaders:
    """Tests for request-specific HTTP header plumbing."""

    def test_extra_headers_forwarded_to_sync_create(self) -> None:
        model = _make_model()
        model.client = MagicMock()
        model.client.create.return_value = {
            "choices": [{"message": {"role": "assistant", "content": "ok"}}],
            "usage": {},
        }
        headers = {
            "x-session-affinity": "thread-123",
            "x-multi-turn-session-id": "thread-123",
        }

        model.invoke("Hello", extra_headers=headers)

        call_kwargs = model.client.create.call_args[1]
        assert call_kwargs["extra_headers"] == headers
        # `extra_headers` must reach the SDK at the top level, not be folded
        # into `extra_body` by `_prepare_sdk_kwargs`.
        assert "extra_headers" not in call_kwargs.get("extra_body", {})

    async def test_extra_headers_forwarded_to_async_create(self) -> None:
        model = _make_model()
        model.async_client = MagicMock()
        headers = {
            "x-session-affinity": "thread-123",
            "x-multi-turn-session-id": "thread-123",
        }

        async def _create(**_kwargs: Any) -> dict[str, Any]:
            return {
                "choices": [{"message": {"role": "assistant", "content": "ok"}}],
                "usage": {},
            }

        model.async_client.create = MagicMock(side_effect=_create)

        await model.ainvoke("Hello", extra_headers=headers)

        call_kwargs = model.async_client.create.call_args[1]
        assert call_kwargs["extra_headers"] == headers

    def test_extra_headers_forwarded_when_streaming(self) -> None:
        """`extra_headers` must also survive the separate streaming param path."""
        model = _make_model()
        model.client = MagicMock()
        model.client.create.return_value = iter(list(_STREAM_CHUNKS))
        headers = {
            "x-session-affinity": "thread-123",
            "x-multi-turn-session-id": "thread-123",
        }

        list(model.stream("Hello", extra_headers=headers))

        call_kwargs = model.client.create.call_args[1]
        assert call_kwargs["extra_headers"] == headers
        assert "extra_headers" not in call_kwargs.get("extra_body", {})


class TestStreamUsage:
    """Tests for the `stream_usage` field and `stream_options` plumbing."""

    def test_stream_options_passed_by_default(self) -> None:
        model = _make_model()
        model.client = MagicMock()
        model.client.create.return_value = iter(list(_STREAM_CHUNKS))
        list(model.stream("Hello"))
        call_kwargs = model.client.create.call_args[1]
        assert call_kwargs["extra_body"]["stream_options"] == {"include_usage": True}

    def test_stream_options_not_passed_when_disabled(self) -> None:
        model = _make_model(stream_usage=False)
        model.client = MagicMock()
        model.client.create.return_value = iter(list(_STREAM_CHUNKS))
        list(model.stream("Hello"))
        call_kwargs = model.client.create.call_args[1]
        assert "stream_options" not in call_kwargs
        assert "extra_body" not in call_kwargs

    def test_user_stream_options_in_model_kwargs_wins(self) -> None:
        """User-provided stream_options via model_kwargs overrides the default."""
        custom = {"include_usage": False}
        model = _make_model(model_kwargs={"stream_options": custom})
        model.client = MagicMock()
        model.client.create.return_value = iter(list(_STREAM_CHUNKS))
        list(model.stream("Hello"))
        call_kwargs = model.client.create.call_args[1]
        assert call_kwargs["extra_body"]["stream_options"] == custom

    def test_extra_body_stream_options_wins_over_top_level(
        self, caplog: pytest.LogCaptureFixture
    ) -> None:
        """`extra_body['stream_options']` wins over a top-level value.

        When both are supplied, the `extra_body` value is preserved and a
        warning is logged.
        """
        explicit = {"include_usage": False}
        model = _make_model(
            model_kwargs={
                "stream_options": {"include_usage": True},
                "extra_body": {"stream_options": explicit},
            },
        )
        model.client = MagicMock()
        model.client.create.return_value = iter(list(_STREAM_CHUNKS))
        with caplog.at_level("WARNING", logger="langchain_fireworks.chat_models"):
            list(model.stream("Hello"))
        call_kwargs = model.client.create.call_args[1]
        assert call_kwargs["extra_body"]["stream_options"] == explicit
        assert "stream_options" not in call_kwargs
        assert any(
            "extra_body" in rec.message and "discarding" in rec.message
            for rec in caplog.records
        )

    def test_usage_only_chunk_emits_usage_metadata(self) -> None:
        """The final empty-choices + usage chunk propagates as usage_metadata."""
        model = _make_model()
        model.client = MagicMock()
        model.client.create.return_value = iter(list(_STREAM_CHUNKS))
        chunks = list(model.stream("Hello"))
        usage_chunks = [c for c in chunks if c.usage_metadata]
        assert len(usage_chunks) == 1
        assert usage_chunks[0].usage_metadata == {
            "input_tokens": 5,
            "output_tokens": 2,
            "total_tokens": 7,
        }

    async def test_astream_options_passed_by_default(self) -> None:
        model = _make_model()
        model.async_client = MagicMock()

        async def _aiter() -> Any:
            for c in _STREAM_CHUNKS:
                yield c

        async def _create(**_kwargs: Any) -> Any:
            return _aiter()

        model.async_client.create = MagicMock(side_effect=_create)
        [chunk async for chunk in model.astream("Hello")]
        call_kwargs = model.async_client.create.call_args[1]
        assert call_kwargs["extra_body"]["stream_options"] == {"include_usage": True}

    async def test_astream_usage_only_chunk_emits_usage_metadata(self) -> None:
        model = _make_model()
        model.async_client = MagicMock()

        async def _aiter() -> Any:
            for c in _STREAM_CHUNKS:
                yield c

        async def _create(**_kwargs: Any) -> Any:
            return _aiter()

        model.async_client.create = MagicMock(side_effect=_create)
        chunks = [chunk async for chunk in model.astream("Hello")]
        usage_chunks = [c for c in chunks if c.usage_metadata]
        assert len(usage_chunks) == 1
        assert usage_chunks[0].usage_metadata == {
            "input_tokens": 5,
            "output_tokens": 2,
            "total_tokens": 7,
        }


class TestReasoningEffort:
    """Tests for the `reasoning_effort` field plumbing."""

    def test_reasoning_effort_omitted_by_default(self) -> None:
        model = _make_model()
        assert "reasoning_effort" not in model._default_params

    def test_reasoning_effort_in_default_params_when_set(self) -> None:
        model = _make_model(reasoning_effort="high")
        assert model._default_params["reasoning_effort"] == "high"

    def test_reasoning_effort_passed_to_client_when_set(self) -> None:
        model = _make_model(reasoning_effort="high")
        model.client = MagicMock()
        model.client.create.return_value = {
            "choices": [
                {
                    "message": {"role": "assistant", "content": "hi"},
                    "finish_reason": "stop",
                }
            ],
            "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2},
        }
        model.invoke("Hello")
        call_kwargs = model.client.create.call_args[1]
        assert call_kwargs["reasoning_effort"] == "high"

    def test_reasoning_effort_not_passed_when_unset(self) -> None:
        model = _make_model()
        model.client = MagicMock()
        model.client.create.return_value = {
            "choices": [
                {
                    "message": {"role": "assistant", "content": "hi"},
                    "finish_reason": "stop",
                }
            ],
            "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2},
        }
        model.invoke("Hello")
        call_kwargs = model.client.create.call_args[1]
        assert "reasoning_effort" not in call_kwargs

    def test_reasoning_effort_as_call_time_kwarg(self) -> None:
        """`reasoning_effort` also works as a call-time keyword argument.

        This is the standard `reasoning_effort` param shared across chat model
        integrations, so it must work via `model.invoke(..., reasoning_effort=...)`
        without requiring it to be set on the model instance.
        """
        model = _make_model()
        model.client = MagicMock()
        model.client.create.return_value = {
            "choices": [
                {
                    "message": {"role": "assistant", "content": "hi"},
                    "finish_reason": "stop",
                }
            ],
            "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2},
        }
        model.invoke("Hello", reasoning_effort="low")
        call_kwargs = model.client.create.call_args[1]
        assert call_kwargs["reasoning_effort"] == "low"

    def test_reasoning_effort_call_time_kwarg_overrides_construction_time(
        self,
    ) -> None:
        model = _make_model(reasoning_effort="low")
        model.client = MagicMock()
        model.client.create.return_value = {
            "choices": [
                {
                    "message": {"role": "assistant", "content": "hi"},
                    "finish_reason": "stop",
                }
            ],
            "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2},
        }
        model.invoke("Hello", reasoning_effort="high")
        call_kwargs = model.client.create.call_args[1]
        assert call_kwargs["reasoning_effort"] == "high"


class TestServiceTier:
    """Tests for the `service_tier` field plumbing."""

    def test_service_tier_omitted_by_default(self) -> None:
        model = _make_model()
        assert "service_tier" not in model._default_params

    def test_service_tier_in_default_params_when_set(self) -> None:
        model = _make_model(service_tier="priority")
        assert model._default_params["service_tier"] == "priority"

    def test_service_tier_passed_to_client_when_set(self) -> None:
        model = _make_model(service_tier="priority")
        model.client = MagicMock()
        model.client.create.return_value = {
            "choices": [
                {
                    "message": {"role": "assistant", "content": "hi"},
                    "finish_reason": "stop",
                }
            ],
            "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2},
        }
        model.invoke("Hello")
        call_kwargs = model.client.create.call_args[1]
        assert call_kwargs["service_tier"] == "priority"

    def test_service_tier_not_passed_when_unset(self) -> None:
        model = _make_model()
        model.client = MagicMock()
        model.client.create.return_value = {
            "choices": [
                {
                    "message": {"role": "assistant", "content": "hi"},
                    "finish_reason": "stop",
                }
            ],
            "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2},
        }
        model.invoke("Hello")
        call_kwargs = model.client.create.call_args[1]
        assert "service_tier" not in call_kwargs

    def test_service_tier_echoed_in_response_metadata(self) -> None:
        model = _make_model(service_tier="priority")
        model.client = MagicMock()
        model.client.create.return_value = {
            "choices": [
                {
                    "message": {"role": "assistant", "content": "hi"},
                    "finish_reason": "stop",
                }
            ],
            "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2},
            "service_tier": "priority",
        }
        result = model.invoke("Hello")
        assert isinstance(result, AIMessage)
        assert result.response_metadata["service_tier"] == "priority"

    def test_service_tier_echoed_in_stream_chunks(self) -> None:
        model = _make_model(service_tier="priority")
        model.client = MagicMock()
        chunks: list[dict[str, Any]] = [
            {
                "choices": [{"delta": {"role": "assistant", "content": "hi"}}],
                "service_tier": "priority",
            },
            {
                "choices": [],
                "usage": {
                    "prompt_tokens": 1,
                    "completion_tokens": 1,
                    "total_tokens": 2,
                },
                "service_tier": "priority",
            },
        ]
        model.client.create.return_value = iter(chunks)
        out = list(model.stream("Hello"))
        tagged = [c for c in out if c.response_metadata.get("service_tier")]
        assert tagged
        assert all(c.response_metadata["service_tier"] == "priority" for c in tagged)

    def test_service_tier_absent_when_not_in_response(self) -> None:
        model = _make_model()
        model.client = MagicMock()
        model.client.create.return_value = {
            "choices": [
                {
                    "message": {"role": "assistant", "content": "hi"},
                    "finish_reason": "stop",
                }
            ],
            "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2},
        }
        result = model.invoke("Hello")
        assert isinstance(result, AIMessage)
        assert "service_tier" not in result.response_metadata

    def test_service_tier_in_llm_output_when_response_carries_it(self) -> None:
        model = _make_model(service_tier="priority")
        chat_result = model._create_chat_result(
            {
                "choices": [
                    {
                        "message": {"role": "assistant", "content": "hi"},
                        "finish_reason": "stop",
                    }
                ],
                "usage": {
                    "prompt_tokens": 1,
                    "completion_tokens": 1,
                    "total_tokens": 2,
                },
                "service_tier": "priority",
            }
        )
        assert chat_result.llm_output is not None
        assert chat_result.llm_output["service_tier"] == "priority"

    def test_service_tier_not_inferred_from_request(self) -> None:
        """Init-set tier must not leak into response_metadata if API omits it."""
        model = _make_model(service_tier="priority")
        model.client = MagicMock()
        model.client.create.return_value = {
            "choices": [
                {
                    "message": {"role": "assistant", "content": "hi"},
                    "finish_reason": "stop",
                }
            ],
            "usage": {"prompt_tokens": 1, "completion_tokens": 1, "total_tokens": 2},
        }
        result = model.invoke("Hello")
        assert isinstance(result, AIMessage)
        assert "service_tier" not in result.response_metadata


_CONTEXT_OVERFLOW_MESSAGE = (
    '{"error": {"object": "error", "type": "invalid_request_error", '
    '"code": "invalid_request_error", "message": "The prompt is too long: '
    '500208, model maximum context length: 262143"}}'
)


def test_context_overflow_error_invoke_sync() -> None:
    """Prompt-too-long errors surface as `ContextOverflowError` on invoke."""
    llm = _make_llm(max_retries=0)
    mock_client = MagicMock()
    mock_client.create.side_effect = _api_error(
        BadRequestError, _CONTEXT_OVERFLOW_MESSAGE, 400
    )
    llm.client = mock_client

    with pytest.raises(ContextOverflowError) as exc_info:
        llm.invoke([HumanMessage(content="test")])

    assert "prompt is too long" in str(exc_info.value)
    assert isinstance(exc_info.value, FireworksContextOverflowError)


async def test_context_overflow_error_invoke_async() -> None:
    """Prompt-too-long errors surface as `ContextOverflowError` on ainvoke."""
    llm = _make_llm(max_retries=0)
    mock_async = MagicMock()

    async def _create(**_kwargs: Any) -> dict[str, Any]:
        raise _api_error(BadRequestError, _CONTEXT_OVERFLOW_MESSAGE, 400)

    mock_async.create = _create
    llm.async_client = mock_async

    with pytest.raises(ContextOverflowError) as exc_info:
        await llm.ainvoke([HumanMessage(content="test")])

    assert "prompt is too long" in str(exc_info.value)
    assert isinstance(exc_info.value, FireworksContextOverflowError)


def test_context_overflow_error_stream_sync() -> None:
    """Prompt-too-long errors surface as `ContextOverflowError` on stream."""
    llm = _make_llm(max_retries=0)
    mock_client = MagicMock()
    mock_client.create.side_effect = _api_error(
        BadRequestError, _CONTEXT_OVERFLOW_MESSAGE, 400
    )
    llm.client = mock_client

    with pytest.raises(ContextOverflowError) as exc_info:
        list(llm.stream([HumanMessage(content="test")]))

    assert "prompt is too long" in str(exc_info.value)
    assert isinstance(exc_info.value, FireworksContextOverflowError)


async def test_context_overflow_error_stream_async() -> None:
    """Prompt-too-long errors surface as `ContextOverflowError` on astream."""
    llm = _make_llm(max_retries=0)
    mock_async = MagicMock()

    async def _create(**_kwargs: Any) -> Any:
        async def _failing_agen() -> Any:
            raise _api_error(BadRequestError, _CONTEXT_OVERFLOW_MESSAGE, 400)
            yield  # pragma: no cover

        return _failing_agen()

    mock_async.create = _create
    llm.async_client = mock_async

    with pytest.raises(ContextOverflowError) as exc_info:
        async for _ in llm.astream([HumanMessage(content="test")]):
            pass

    assert "prompt is too long" in str(exc_info.value)
    assert isinstance(exc_info.value, FireworksContextOverflowError)


def test_context_overflow_error_backwards_compatibility() -> None:
    """`ContextOverflowError` is also catchable as `BadRequestError`."""
    llm = _make_llm(max_retries=0)
    mock_client = MagicMock()
    mock_client.create.side_effect = _api_error(
        BadRequestError, _CONTEXT_OVERFLOW_MESSAGE, 400
    )
    llm.client = mock_client

    with pytest.raises(BadRequestError) as exc_info:
        llm.invoke([HumanMessage(content="test")])

    assert isinstance(exc_info.value, BadRequestError)
    assert isinstance(exc_info.value, ContextOverflowError)


def test_unrelated_invalid_request_error_not_promoted() -> None:
    """Unrelated `BadRequestError`s should not be wrapped."""
    llm = _make_llm(max_retries=0)
    mock_client = MagicMock()
    mock_client.create.side_effect = _api_error(
        BadRequestError, "some other bad request", 400
    )
    llm.client = mock_client

    with pytest.raises(BadRequestError) as exc_info:
        llm.invoke([HumanMessage(content="test")])

    assert not isinstance(exc_info.value, ContextOverflowError)


def test_context_overflow_error_carries_response_metadata() -> None:
    """Promoted `FireworksContextOverflowError` preserves `response`/`body`.

    Downstream catchers that introspect `.response.status_code` rely on this.
    """
    llm = _make_llm(max_retries=0)
    mock_client = MagicMock()
    mock_client.create.side_effect = _api_error(
        BadRequestError, _CONTEXT_OVERFLOW_MESSAGE, 400
    )
    llm.client = mock_client

    with pytest.raises(FireworksContextOverflowError) as exc_info:
        llm.invoke([HumanMessage(content="test")])

    assert exc_info.value.response.status_code == 400
    assert exc_info.value.body is None


def test_sdk_clients_constructed_with_max_retries_zero(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """`Fireworks` / `AsyncFireworks` must be built with `max_retries=0`.

    Retries are owned by `_create_retry_decorator`; if this kwarg is lost,
    every retryable failure would be retried by both layers.
    """
    sync_mock = MagicMock()
    async_mock = MagicMock()
    monkeypatch.setattr("langchain_fireworks.chat_models.Fireworks", sync_mock)
    monkeypatch.setattr("langchain_fireworks.chat_models.AsyncFireworks", async_mock)

    ChatFireworks(model=MODEL_NAME, api_key="fake-key")  # type: ignore[arg-type]

    assert sync_mock.call_args.kwargs["max_retries"] == 0
    assert async_mock.call_args.kwargs["max_retries"] == 0


def test_request_timeout_tuple_normalized_to_httpx_timeout(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """0.x's `(connect, read)` tuple still works after the 1.x migration.

    1.x's SDK only accepts `float | httpx.Timeout | None`. The validator
    normalizes the legacy tuple so existing user code keeps working.
    """
    sync_mock = MagicMock()
    async_mock = MagicMock()
    monkeypatch.setattr("langchain_fireworks.chat_models.Fireworks", sync_mock)
    monkeypatch.setattr("langchain_fireworks.chat_models.AsyncFireworks", async_mock)

    ChatFireworks(
        model=MODEL_NAME,
        api_key="fake-key",  # type: ignore[arg-type]
        timeout=(5.0, 30.0),
    )

    forwarded = sync_mock.call_args.kwargs["timeout"]
    assert isinstance(forwarded, httpx.Timeout)
    assert forwarded.connect == 5.0
    assert forwarded.read == 30.0
    assert async_mock.call_args.kwargs["timeout"] == forwarded


def test_langsmith_gateway_true(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setenv("LANGSMITH_GATEWAY", "true")
    llm = _make_model()
    assert llm.fireworks_api_base == "https://gateway.smith.langchain.com/fireworks"


def test_langsmith_gateway_false(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setenv("LANGSMITH_GATEWAY", "false")
    monkeypatch.delenv("FIREWORKS_API_BASE", raising=False)
    llm = _make_model()
    assert llm.fireworks_api_base is None


def test_langsmith_gateway_unset(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.delenv("LANGSMITH_GATEWAY", raising=False)
    monkeypatch.delenv("FIREWORKS_API_BASE", raising=False)
    llm = _make_model()
    assert llm.fireworks_api_base is None


def test_langsmith_gateway_custom_url(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setenv("LANGSMITH_GATEWAY", "https://my-gateway.example.com/")
    monkeypatch.delenv("FIREWORKS_API_BASE", raising=False)
    llm = _make_model()
    assert llm.fireworks_api_base == "https://my-gateway.example.com/fireworks"


def test_langsmith_gateway_provider_env_overrides_gateway(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.setenv("LANGSMITH_GATEWAY", "true")
    monkeypatch.setenv("FIREWORKS_API_BASE", "https://api.fireworks.ai/inference/v1")
    llm = _make_model()
    assert llm.fireworks_api_base == "https://api.fireworks.ai/inference/v1"


def test_langsmith_gateway_api_key(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setenv("LANGSMITH_GATEWAY", "true")
    monkeypatch.setenv("LANGSMITH_GATEWAY_API_KEY", "gateway-key")
    monkeypatch.delenv("FIREWORKS_API_KEY", raising=False)
    llm = ChatFireworks(model=MODEL_NAME)  # type: ignore[call-arg]
    assert llm.fireworks_api_key.get_secret_value() == "gateway-key"


def test_langsmith_gateway_api_key_not_used_without_gateway(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.delenv("LANGSMITH_GATEWAY", raising=False)
    monkeypatch.setenv("LANGSMITH_GATEWAY_API_KEY", "gateway-key")
    monkeypatch.setenv("FIREWORKS_API_KEY", "provider-key")
    llm = ChatFireworks(model=MODEL_NAME)  # type: ignore[call-arg]
    assert llm.fireworks_api_key.get_secret_value() == "provider-key"


def test_langsmith_gateway_api_key_overrides_provider_key(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.setenv("LANGSMITH_GATEWAY", "true")
    monkeypatch.setenv("LANGSMITH_GATEWAY_API_KEY", "gateway-key")
    monkeypatch.setenv("FIREWORKS_API_KEY", "provider-key")
    llm = ChatFireworks(model=MODEL_NAME)  # type: ignore[call-arg]
    assert llm.fireworks_api_key.get_secret_value() == "gateway-key"
