import types
import pytest

from application.llm.openai import OpenAILLM


class FakeChatCompletions:
    def __init__(self):
        self.last_kwargs = None

    class _Msg:
        def __init__(self, content=None, tool_calls=None):
            self.content = content
            self.tool_calls = tool_calls

    class _Delta:
        def __init__(self, content=None):
            self.content = content

    class _Choice:
        def __init__(self, content=None, delta=None, finish_reason="stop"):
            self.message = FakeChatCompletions._Msg(content=content)
            self.delta = FakeChatCompletions._Delta(content=delta)
            self.finish_reason = finish_reason

    class _StreamLine:
        def __init__(self, deltas):
            self.choices = [FakeChatCompletions._Choice(delta=d) for d in deltas]

    class _Response:
        def __init__(self, choices=None, lines=None):
            self._choices = choices or []
            self._lines = lines or []

        @property
        def choices(self):
            return self._choices

        def __iter__(self):
            for line in self._lines:
                yield line

    def create(self, **kwargs):
        self.last_kwargs = kwargs
        # default non-streaming: return content
        if not kwargs.get("stream"):
            return FakeChatCompletions._Response(choices=[
                FakeChatCompletions._Choice(content="hello world")
            ])
        # streaming: yield line objects each with choices[0].delta.content
        return FakeChatCompletions._Response(lines=[
            FakeChatCompletions._StreamLine(["part1"]),
            FakeChatCompletions._StreamLine(["part2"]),
        ])


class FakeClient:
    def __init__(self):
        self.chat = types.SimpleNamespace(completions=FakeChatCompletions())


@pytest.fixture
def openai_llm(monkeypatch):
    llm = OpenAILLM(api_key="sk-test", user_api_key=None)
    llm.storage = types.SimpleNamespace(
        get_file=lambda path: types.SimpleNamespace(read=lambda: b"img"),
        file_exists=lambda path: True,
        process_file=lambda path, processor_func, **kwargs: "file_id_123",
    )
    llm.client = FakeClient()
    return llm


def test_clean_messages_openai_variants(openai_llm):
    messages = [
        {"role": "system", "content": "sys"},
        {"role": "model", "content": "asst"}, 
        {"role": "user", "content": [
            {"text": "hello"},
            {"function_call": {"call_id": "c1", "name": "fn", "args": {"a": 1}}},
            {"function_response": {"call_id": "c1", "name": "fn", "response": {"result": 42}}},
            {"type": "image_url", "image_url": {"url": "data:image/png;base64,AAA"}},
        ]},
    ]

    cleaned = openai_llm._clean_messages_openai(messages)

    roles = [m["role"] for m in cleaned]
    assert roles.count("assistant") >= 1
    assert any(m["role"] == "tool" for m in cleaned)

    assert any(isinstance(m["content"], list) and any(
        part.get("type") == "image_url" for part in m["content"] if isinstance(part, dict)
    ) for m in cleaned if m["role"] == "user")


def test_raw_gen_calls_openai_client_and_returns_content(openai_llm):
    msgs = [
        {"role": "system", "content": "sys"},
        {"role": "user", "content": "hello"},
    ]
    content = openai_llm._raw_gen(openai_llm, model="gpt-4o", messages=msgs, stream=False)
    assert content == "hello world"

    passed = openai_llm.client.chat.completions.last_kwargs
    assert passed["model"] == "gpt-4o"
    assert isinstance(passed["messages"], list)
    assert passed["stream"] is False


def test_raw_gen_stream_yields_chunks(openai_llm):
    msgs = [
        {"role": "user", "content": "hi"},
    ]
    gen = openai_llm._raw_gen_stream(openai_llm, model="gpt", messages=msgs, stream=True)
    chunks = list(gen)
    assert "part1" in "".join(chunks)
    assert "part2" in "".join(chunks)


def test_prepare_structured_output_format_enforces_required_and_strict(openai_llm):
    schema = {
        "type": "object",
        "properties": {
            "a": {"type": "string"},
            "b": {"type": "number"},
        },
    }
    result = openai_llm.prepare_structured_output_format(schema)
    assert result["type"] == "json_schema"
    js = result["json_schema"]
    assert js["strict"] is True
    assert set(js["schema"]["required"]) == {"a", "b"}
    assert js["schema"]["additionalProperties"] is False


def test_prepare_messages_with_attachments_image_and_pdf(openai_llm, monkeypatch):

    monkeypatch.setattr(openai_llm, "_get_base64_image", lambda att: "AAA=")
    monkeypatch.setattr(openai_llm, "_upload_file_to_openai", lambda att: "file_xyz")

    messages = [{"role": "user", "content": "Hi"}]
    attachments = [
        {"path": "/tmp/img.png", "mime_type": "image/png"},
        {"path": "/tmp/doc.pdf", "mime_type": "application/pdf"},
    ]
    out = openai_llm.prepare_messages_with_attachments(messages, attachments)

    # last user message should have list content with text and two attachments
    user_msg = next(m for m in out if m["role"] == "user")
    assert isinstance(user_msg["content"], list)
    types_in_content = [p.get("type") for p in user_msg["content"] if isinstance(p, dict)]
    assert "image_url" in types_in_content or any(
        isinstance(p, dict) and p.get("image_url") for p in user_msg["content"]
    )
    assert any(isinstance(p, dict) and p.get("file", {}).get("file_id") == "file_xyz" for p in user_msg["content"])