import json
from pathlib import Path
from types import SimpleNamespace
from typing import Any, Callable, Iterator
from unittest import mock

import pytest
from fastapi.testclient import TestClient
from PIL import Image

from immich_ml.config import log
from immich_ml.main import app
from immich_ml.models.base import InferenceModel
from immich_ml.schemas import Shape
from immich_ml.sessions.ort import Device

TEST_ASSETS = Path(__file__).parent.parent / "e2e/test-assets"


@pytest.fixture(scope="session")
def asset() -> Callable[[str], bytes]:
    return lambda path: (TEST_ASSETS / path).read_bytes()


@pytest.fixture
def pil_image() -> Image.Image:
    return Image.new("RGB", (600, 800))


@pytest.fixture(scope="session")
def deployed_app() -> Iterator[TestClient]:
    with TestClient(app) as client:
        yield client


@pytest.fixture(scope="session")
def responses() -> dict[str, Any]:
    responses: dict[str, Any] = json.load(open("responses.json", "r"))
    return responses


@pytest.fixture(scope="session")
def clip_model_cfg() -> dict[str, Any]:
    return {
        "embed_dim": 512,
        "vision_cfg": {"image_size": 224, "layers": 12, "width": 768, "patch_size": 32},
        "text_cfg": {"context_length": 77, "vocab_size": 49408, "width": 512, "heads": 8, "layers": 12},
    }


@pytest.fixture(scope="session")
def clip_preprocess_cfg() -> dict[str, Any]:
    return {
        "size": [224, 224],
        "mode": "RGB",
        "mean": [0.48145466, 0.4578275, 0.40821073],
        "std": [0.26862954, 0.26130258, 0.27577711],
        "interpolation": "bicubic",
        "resize_mode": "shortest",
        "fill_color": 0,
    }


@pytest.fixture(scope="session")
def clip_tokenizer_cfg() -> dict[str, Any]:
    return {
        "add_prefix_space": False,
        "added_tokens_decoder": {
            "49406": {
                "content": "<|startoftext|>",
                "lstrip": False,
                "normalized": True,
                "rstrip": False,
                "single_word": False,
                "special": True,
            },
            "49407": {
                "content": "<|endoftext|>",
                "lstrip": False,
                "normalized": True,
                "rstrip": False,
                "single_word": False,
                "special": True,
            },
        },
        "bos_token": "<|startoftext|>",
        "clean_up_tokenization_spaces": True,
        "do_lower_case": True,
        "eos_token": "<|endoftext|>",
        "errors": "replace",
        "model_max_length": 77,
        "pad_token": "<|endoftext|>",
        "tokenizer_class": "CLIPTokenizer",
        "unk_token": "<|endoftext|>",
    }


@pytest.fixture(scope="function")
def providers(request: pytest.FixtureRequest) -> Iterator[mock.Mock]:
    marker = request.node.get_closest_marker("providers")
    if marker is None:
        raise ValueError("Missing marker 'providers'")

    providers = marker.args[0]
    with mock.patch("immich_ml.sessions.ort.ort.get_available_providers") as mocked:
        mocked.return_value = providers
        yield providers


@pytest.fixture(autouse=True)
def gpus() -> Iterator[None]:
    with (
        mock.patch("immich_ml.sessions.ort._intel_gpu", return_value=Device("12.71.4-128eu", "26.22.38646.4")),
        mock.patch("immich_ml.sessions.ort._amd_gpu", return_value=Device("gfx1100", "7.2.0")),
        mock.patch("immich_ml.sessions.ort._nvidia_gpu", return_value=Device("sm89", "617.14 10601")),
    ):
        yield


@pytest.fixture(scope="function")
def ort_pybind() -> Iterator[mock.Mock]:
    with mock.patch("immich_ml.sessions.ort.ort.capi._pybind_state") as mocked:
        yield mocked


@pytest.fixture(scope="function")
def ov_device_ids(request: pytest.FixtureRequest, ort_pybind: mock.Mock) -> Iterator[mock.Mock]:
    marker = request.node.get_closest_marker("ov_device_ids")
    if marker is None:
        raise ValueError("Missing marker 'ov_device_ids'")
    ort_pybind.get_available_openvino_device_ids.return_value = marker.args[0]
    return ort_pybind


@pytest.fixture(scope="function")
def ort_session() -> Iterator[mock.Mock]:
    # a graph is opened as it is: preparing one takes a child process and real files
    with (
        mock.patch("immich_ml.sessions.ort.ort.InferenceSession") as mocked,
        mock.patch("immich_ml.sessions.ort.prepared", side_effect=lambda spec: spec.model_path),
    ):
        yield mocked


@pytest.fixture(scope="function")
def stub_session() -> Callable[..., mock.Mock]:
    def _make(
        shape: tuple[Any, ...],
        outputs: Any = None,
        name: str = "input.1",
        normalizes_input: bool = False,
        shapes: tuple[Shape, ...] = (Shape(batch=1),),
    ) -> mock.Mock:
        session = mock.Mock()
        session.get_inputs.return_value = [SimpleNamespace(name=name, shape=shape)]
        session.normalizes_input = normalizes_input
        session.shapes = shapes
        session.batches = tuple(sorted({shape.batch for shape in shapes}, reverse=True))
        session.for_shape.return_value = session  # a stub is the session and the one graph in it
        if outputs is not None:
            session.run.return_value = outputs
        return session

    return _make


@pytest.fixture(scope="function")
def ann_session() -> Iterator[mock.Mock]:
    with mock.patch("immich_ml.sessions.ann.Ann") as mocked:
        mocked.return_value.input_shapes.__getitem__.return_value = [(1, 3, 112, 112)]  # armnn compiles one batch
        yield mocked


@pytest.fixture(scope="function")
def rknn_session() -> Iterator[mock.Mock]:
    with mock.patch("immich_ml.sessions.rknn.RknnPoolExecutor") as mocked:
        mocked.return_value.custom_string = ""  # an unstamped binary, i.e. one that wants normalized input
        compiled = SimpleNamespace(name="input", shape=(1, 224, 224, 3))  # the compiler reports NHWC either way
        mocked.return_value.inputs = [compiled, compiled]
        yield mocked


@pytest.fixture(scope="function")
def rmtree() -> Iterator[mock.Mock]:
    with mock.patch("immich_ml.models.base.rmtree", autospec=True) as mocked:
        mocked.avoids_symlink_attacks = True
        yield mocked


@pytest.fixture(scope="function")
def path() -> Iterator[mock.Mock]:
    path = mock.MagicMock()
    path.exists.return_value = True
    path.is_dir.return_value = True
    path.is_file.return_value = True
    path.with_suffix.return_value = path
    path.return_value = path

    with mock.patch("immich_ml.models.base.Path", return_value=path) as mocked:
        yield mocked


@pytest.fixture(scope="function")
def info() -> Iterator[mock.Mock]:
    with mock.patch.object(log, "info") as mocked:
        yield mocked


@pytest.fixture(scope="function")
def warning() -> Iterator[mock.Mock]:
    with mock.patch.object(log, "warning") as mocked:
        yield mocked


@pytest.fixture(scope="function")
def exception() -> Iterator[mock.Mock]:
    with mock.patch.object(log, "exception") as mocked:
        yield mocked


@pytest.fixture(scope="function")
def snapshot_download() -> Iterator[mock.Mock]:
    # a download that leaves the model cached, as one that found the artifact does
    with (
        mock.patch("immich_ml.models.base.snapshot_download") as mocked,
        mock.patch.object(InferenceModel, "cached", new_callable=mock.PropertyMock, side_effect=lambda: mocked.called),
    ):
        yield mocked