import numpy as np
import pytest
from openai import APIStatusError
from sync.embeddings_client import EmbeddingsClient


class _FakeEmbeddingDatum:
    def __init__(self, embedding, index):
        self.embedding = embedding
        self.index = index


class _FakeEmbeddingsResponse:
    def __init__(self, data):
        self.data = data


def test_embed_batch_parses_response(monkeypatch):
    captured = {}

    def fake_create(self, model, input):
        captured["model"] = model
        captured["input"] = input
        return _FakeEmbeddingsResponse([
            _FakeEmbeddingDatum([0.2] * 1024, 1),
            _FakeEmbeddingDatum([0.1] * 1024, 0),
        ])

    monkeypatch.setattr("openai.resources.embeddings.Embeddings.create", fake_create)

    client = EmbeddingsClient(base_url="http://fake", api_key="k")
    result = client.embed_batch(["a", "b"])

    assert captured["input"] == ["a", "b"]
    assert len(result) == 2
    assert result[0].shape == (1024,)
    assert result[0].dtype == np.float32
    assert np.isclose(result[0][0], 0.1)
    assert np.isclose(result[1][0], 0.2)


def test_embed_batch_empty_input_makes_no_requests(monkeypatch):
    called = {"n": 0}

    def fake_create(self, model, input):
        called["n"] += 1
        return _FakeEmbeddingsResponse([])

    monkeypatch.setattr("openai.resources.embeddings.Embeddings.create", fake_create)

    client = EmbeddingsClient(base_url="http://fake", api_key="k")
    assert client.embed_batch([]) == []
    assert called["n"] == 0


def test_embed_batch_chunks_large_input(monkeypatch):
    captured = []

    def fake_create(self, model, input):
        captured.append(list(input))
        # index resets to 0 within each request, as on the real API
        return _FakeEmbeddingsResponse([
            _FakeEmbeddingDatum([float(i)] * 1024, i) for i in range(len(input))
        ])

    monkeypatch.setattr("openai.resources.embeddings.Embeddings.create", fake_create)
    monkeypatch.setattr("sync.embeddings_client._BATCH_SIZE", 32)

    client = EmbeddingsClient(base_url="http://fake", api_key="k")
    texts = [f"t{i}" for i in range(80)]
    result = client.embed_batch(texts)

    assert len(captured) == 3  # 32 + 32 + 16
    assert captured[0] == texts[:32]
    assert captured[1] == texts[32:64]
    assert captured[2] == texts[64:]
    assert len(result) == 80
    # order preserved within and across chunks (each chunk's vectors come back 0..n-1)
    assert [round(v[0]) for v in result] == list(range(32)) + list(range(32)) + list(range(16))


def test_embed_batch_retries_on_timeout_then_succeeds(monkeypatch):
    import httpx
    from openai import APITimeoutError

    calls = {"n": 0}

    def fake_create(self, model, input):
        calls["n"] += 1
        if calls["n"] == 1:
            raise APITimeoutError(request=httpx.Request("POST", "http://fake/embeddings"))
        return _FakeEmbeddingsResponse([_FakeEmbeddingDatum([0.5] * 1024, 0)])

    monkeypatch.setattr("openai.resources.embeddings.Embeddings.create", fake_create)
    monkeypatch.setattr("sync.embeddings_client.time.sleep", lambda _: None)

    client = EmbeddingsClient(base_url="http://fake", api_key="k")
    result = client.embed_batch(["a"])

    assert calls["n"] == 2
    assert np.isclose(result[0][0], 0.5)


def test_embed_batch_raises_after_exhausted_retries(monkeypatch):
    import httpx
    from openai import APITimeoutError

    calls = {"n": 0}

    def fake_create(self, model, input):
        calls["n"] += 1
        raise APITimeoutError(request=httpx.Request("POST", "http://fake/embeddings"))

    monkeypatch.setattr("openai.resources.embeddings.Embeddings.create", fake_create)
    monkeypatch.setattr("sync.embeddings_client.time.sleep", lambda _: None)

    client = EmbeddingsClient(base_url="http://fake", api_key="k")
    with pytest.raises(RuntimeError):
        client.embed_batch(["a"])
    assert calls["n"] == 3  # _MAX_RETRIES attempts


def test_embed_batch_raises_runtime_error_on_api_error(monkeypatch):
    import httpx

    def fake_create(self, model, input):
        request = httpx.Request("POST", "http://fake/embeddings")
        response = httpx.Response(500, request=request, json={"error": "boom"})
        raise APIStatusError("boom", response=response, body={"error": "boom"})

    monkeypatch.setattr("openai.resources.embeddings.Embeddings.create", fake_create)

    client = EmbeddingsClient(base_url="http://fake", api_key="k")
    with pytest.raises(RuntimeError):
        client.embed_batch(["a"])