from io import BytesIO
from typing import TypeAlias
from unittest import mock

import cv2
import numpy as np
import pytest
from fastapi.testclient import TestClient
from PIL import Image
from pytest_mock import MockerFixture

from .config import settings
from .models.cache import ModelCache
from .models.clip import CLIPSTEncoder
from .models.facial_recognition import FaceRecognizer
from .models.image_classification import ImageClassifier
from .schemas import ModelType

ndarray: TypeAlias = np.ndarray[int, np.dtype[np.float32]]


class TestImageClassifier:
    classifier_preds = [
        {"label": "that's an image alright", "score": 0.8},
        {"label": "well it ends with .jpg", "score": 0.1},
        {"label": "idk, im just seeing bytes", "score": 0.05},
        {"label": "not sure", "score": 0.04},
        {"label": "probably a virus", "score": 0.01},
    ]

    def test_eager_init(self, mocker: MockerFixture) -> None:
        mocker.patch.object(ImageClassifier, "download")
        mock_load = mocker.patch.object(ImageClassifier, "load")
        classifier = ImageClassifier("test_model_name", cache_dir="test_cache", eager=True, test_arg="test_arg")

        assert classifier.model_name == "test_model_name"
        mock_load.assert_called_once_with(test_arg="test_arg")

    def test_lazy_init(self, mocker: MockerFixture) -> None:
        mock_download = mocker.patch.object(ImageClassifier, "download")
        mock_load = mocker.patch.object(ImageClassifier, "load")
        face_model = ImageClassifier("test_model_name", cache_dir="test_cache", eager=False, test_arg="test_arg")

        assert face_model.model_name == "test_model_name"
        mock_download.assert_called_once_with(test_arg="test_arg")
        mock_load.assert_not_called()

    def test_min_score(self, pil_image: Image.Image, mocker: MockerFixture) -> None:
        mocker.patch.object(ImageClassifier, "load")
        classifier = ImageClassifier("test_model_name", min_score=0.0)
        assert classifier.min_score == 0.0

        classifier.model = mock.Mock()
        classifier.model.return_value = self.classifier_preds

        all_labels = classifier.predict(pil_image)
        classifier.min_score = 0.5
        filtered_labels = classifier.predict(pil_image)

        assert all_labels == [
            "that's an image alright",
            "well it ends with .jpg",
            "idk",
            "im just seeing bytes",
            "not sure",
            "probably a virus",
        ]
        assert filtered_labels == ["that's an image alright"]


class TestCLIP:
    embedding = np.random.rand(512).astype(np.float32)

    def test_eager_init(self, mocker: MockerFixture) -> None:
        mocker.patch.object(CLIPSTEncoder, "download")
        mock_load = mocker.patch.object(CLIPSTEncoder, "load")
        clip_model = CLIPSTEncoder("test_model_name", cache_dir="test_cache", eager=True, test_arg="test_arg")

        assert clip_model.model_name == "test_model_name"
        mock_load.assert_called_once_with(test_arg="test_arg")

    def test_lazy_init(self, mocker: MockerFixture) -> None:
        mock_download = mocker.patch.object(CLIPSTEncoder, "download")
        mock_load = mocker.patch.object(CLIPSTEncoder, "load")
        clip_model = CLIPSTEncoder("test_model_name", cache_dir="test_cache", eager=False, test_arg="test_arg")

        assert clip_model.model_name == "test_model_name"
        mock_download.assert_called_once_with(test_arg="test_arg")
        mock_load.assert_not_called()

    def test_basic_image(self, pil_image: Image.Image, mocker: MockerFixture) -> None:
        mocker.patch.object(CLIPSTEncoder, "load")
        clip_encoder = CLIPSTEncoder("test_model_name", cache_dir="test_cache")
        clip_encoder.model = mock.Mock()
        clip_encoder.model.encode.return_value = self.embedding
        embedding = clip_encoder.predict(pil_image)

        assert isinstance(embedding, list)
        assert len(embedding) == 512
        assert all([isinstance(num, float) for num in embedding])
        clip_encoder.model.encode.assert_called_once()

    def test_basic_text(self, mocker: MockerFixture) -> None:
        mocker.patch.object(CLIPSTEncoder, "load")
        clip_encoder = CLIPSTEncoder("test_model_name", cache_dir="test_cache")
        clip_encoder.model = mock.Mock()
        clip_encoder.model.encode.return_value = self.embedding
        embedding = clip_encoder.predict("test search query")

        assert isinstance(embedding, list)
        assert len(embedding) == 512
        assert all([isinstance(num, float) for num in embedding])
        clip_encoder.model.encode.assert_called_once()


class TestFaceRecognition:
    def test_eager_init(self, mocker: MockerFixture) -> None:
        mocker.patch.object(FaceRecognizer, "download")
        mock_load = mocker.patch.object(FaceRecognizer, "load")
        face_model = FaceRecognizer("test_model_name", cache_dir="test_cache", eager=True, test_arg="test_arg")

        assert face_model.model_name == "test_model_name"
        mock_load.assert_called_once_with(test_arg="test_arg")

    def test_lazy_init(self, mocker: MockerFixture) -> None:
        mock_download = mocker.patch.object(FaceRecognizer, "download")
        mock_load = mocker.patch.object(FaceRecognizer, "load")
        face_model = FaceRecognizer("test_model_name", cache_dir="test_cache", eager=False, test_arg="test_arg")

        assert face_model.model_name == "test_model_name"
        mock_download.assert_called_once_with(test_arg="test_arg")
        mock_load.assert_not_called()

    def test_set_min_score(self, mocker: MockerFixture) -> None:
        mocker.patch.object(FaceRecognizer, "load")
        face_recognizer = FaceRecognizer("test_model_name", cache_dir="test_cache", min_score=0.5)

        assert face_recognizer.min_score == 0.5

    def test_basic(self, cv_image: cv2.Mat, mocker: MockerFixture) -> None:
        mocker.patch.object(FaceRecognizer, "load")
        face_recognizer = FaceRecognizer("test_model_name", min_score=0.0, cache_dir="test_cache")

        det_model = mock.Mock()
        num_faces = 2
        bbox = np.random.rand(num_faces, 4).astype(np.float32)
        score = np.array([[0.67]] * num_faces).astype(np.float32)
        kpss = np.random.rand(num_faces, 5, 2).astype(np.float32)
        det_model.detect.return_value = (np.concatenate([bbox, score], axis=-1), kpss)
        face_recognizer.det_model = det_model

        rec_model = mock.Mock()
        embedding = np.random.rand(num_faces, 512).astype(np.float32)
        rec_model.get_feat.return_value = embedding
        face_recognizer.rec_model = rec_model

        faces = face_recognizer.predict(cv_image)

        assert len(faces) == num_faces
        for face in faces:
            assert face["imageHeight"] == 800
            assert face["imageWidth"] == 600
            assert isinstance(face["embedding"], list)
            assert len(face["embedding"]) == 512
            assert all([isinstance(num, float) for num in face["embedding"]])

        det_model.detect.assert_called_once()
        assert rec_model.get_feat.call_count == num_faces


@pytest.mark.asyncio
class TestCache:
    async def test_caches(self, mock_get_model: mock.Mock) -> None:
        model_cache = ModelCache()
        await model_cache.get("test_model_name", ModelType.IMAGE_CLASSIFICATION)
        await model_cache.get("test_model_name", ModelType.IMAGE_CLASSIFICATION)
        assert len(model_cache.cache._cache) == 1
        mock_get_model.assert_called_once()

    async def test_kwargs_used(self, mock_get_model: mock.Mock) -> None:
        model_cache = ModelCache()
        await model_cache.get("test_model_name", ModelType.IMAGE_CLASSIFICATION, cache_dir="test_cache")
        mock_get_model.assert_called_once_with(
            ModelType.IMAGE_CLASSIFICATION, "test_model_name", cache_dir="test_cache"
        )

    async def test_different_clip(self, mock_get_model: mock.Mock) -> None:
        model_cache = ModelCache()
        await model_cache.get("test_image_model_name", ModelType.CLIP)
        await model_cache.get("test_text_model_name", ModelType.CLIP)
        mock_get_model.assert_has_calls(
            [
                mock.call(ModelType.CLIP, "test_image_model_name"),
                mock.call(ModelType.CLIP, "test_text_model_name"),
            ]
        )
        assert len(model_cache.cache._cache) == 2

    @mock.patch("app.models.cache.OptimisticLock", autospec=True)
    async def test_model_ttl(self, mock_lock_cls: mock.Mock, mock_get_model: mock.Mock) -> None:
        model_cache = ModelCache(ttl=100)
        await model_cache.get("test_model_name", ModelType.IMAGE_CLASSIFICATION)
        mock_lock_cls.return_value.__aenter__.return_value.cas.assert_called_with(mock.ANY, ttl=100)

    @mock.patch("app.models.cache.SimpleMemoryCache.expire")
    async def test_revalidate(self, mock_cache_expire: mock.Mock, mock_get_model: mock.Mock) -> None:
        model_cache = ModelCache(ttl=100, revalidate=True)
        await model_cache.get("test_model_name", ModelType.IMAGE_CLASSIFICATION)
        await model_cache.get("test_model_name", ModelType.IMAGE_CLASSIFICATION)
        mock_cache_expire.assert_called_once_with(mock.ANY, 100)


@pytest.mark.skipif(
    not settings.test_full,
    reason="More time-consuming since it deploys the app and loads models.",
)
class TestEndpoints:
    def test_tagging_endpoint(self, pil_image: Image.Image, deployed_app: TestClient) -> None:
        byte_image = BytesIO()
        pil_image.save(byte_image, format="jpeg")
        headers = {"Content-Type": "image/jpg"}
        response = deployed_app.post(
            "http://localhost:3003/image-classifier/tag-image",
            content=byte_image.getvalue(),
            headers=headers,
        )
        assert response.status_code == 200

    def test_clip_image_endpoint(self, pil_image: Image.Image, deployed_app: TestClient) -> None:
        byte_image = BytesIO()
        pil_image.save(byte_image, format="jpeg")
        headers = {"Content-Type": "image/jpg"}
        response = deployed_app.post(
            "http://localhost:3003/sentence-transformer/encode-image",
            content=byte_image.getvalue(),
            headers=headers,
        )
        assert response.status_code == 200

    def test_clip_text_endpoint(self, deployed_app: TestClient) -> None:
        response = deployed_app.post(
            "http://localhost:3003/sentence-transformer/encode-text",
            json={"text": "test search query"},
        )
        assert response.status_code == 200

    def test_face_endpoint(self, pil_image: Image.Image, deployed_app: TestClient) -> None:
        byte_image = BytesIO()
        pil_image.save(byte_image, format="jpeg")
        headers = {"Content-Type": "image/jpg"}
        response = deployed_app.post(
            "http://localhost:3003/facial-recognition/detect-faces",
            content=byte_image.getvalue(),
            headers=headers,
        )
        assert response.status_code == 200