import os
import json
import importlib
from typing import Any
import torch
import diffusers


def extract_device(args: list, kwargs: dict):
    device = kwargs.get("device", None)

    if device is None:
        for arg in args:
            if isinstance(arg, torch.device):
                device = arg

    return device


def move_inference_session(session, device: torch.device): # session: ort.InferenceSession
    from modules.devices import device as default_device
    from modules.devices import backend as default_backend

    if default_device.type == "cpu" and default_backend != "openvino": # CPU-only torch without any other external ops overriding. This transfer will be led to mistake.
        return session

    from . import DynamicSessionOptions, TemporalModule
    from .execution_providers import TORCH_DEVICE_TO_EP

    previous_provider = session._providers # pylint: disable=protected-access
    provider = TORCH_DEVICE_TO_EP[device.type] if device.type in TORCH_DEVICE_TO_EP else previous_provider
    path = session._model_path # pylint: disable=protected-access

    try:
        return diffusers.OnnxRuntimeModel.load_model(path, provider, DynamicSessionOptions.from_sess_options(session._sess_options)) # pylint: disable=protected-access
    except Exception:
        return TemporalModule(previous_provider, path, session._sess_options) # pylint: disable=protected-access


def check_diffusers_cache(path: os.PathLike):
    from modules.shared import opts
    return opts.diffusers_dir in os.path.abspath(path)


def check_pipeline_sdxl(cls: type[diffusers.DiffusionPipeline]) -> bool:
    return 'XL' in cls.__name__


def check_cache_onnx(path: os.PathLike) -> bool:
    if not os.path.isdir(path):
        return False

    init_dict_path = os.path.join(path, "model_index.json")

    if not os.path.isfile(init_dict_path):
        return False

    init_dict = None

    with open(init_dict_path, encoding="utf-8") as file:
        init_dict = file.read()

    if "OnnxRuntimeModel" not in init_dict:
        return False

    return True


def load_init_dict(cls: type[diffusers.DiffusionPipeline], path: os.PathLike):
    merged: dict[str, Any] = {}
    extracted = cls.extract_init_dict(diffusers.DiffusionPipeline.load_config(path))

    for item in extracted:
        merged.update(item)

    merged = merged.items()
    R: dict[str, tuple[str]] = {}

    for k, v in merged:
        if isinstance(v, list):
            if k not in cls.__init__.__annotations__:
                continue
            R[k] = v

    return R


def load_submodel(path: os.PathLike, is_sdxl: bool, submodel_name: str, item: list[str | None], **kwargs_ort):
    lib, atr = item

    if lib is None or atr is None:
        return None

    library = importlib.import_module(lib)
    attribute = getattr(library, atr)
    path = os.path.join(path, submodel_name)

    if issubclass(attribute, diffusers.OnnxRuntimeModel):
        return diffusers.OnnxRuntimeModel.load_model(
            os.path.join(path, "model.onnx"),
            **kwargs_ort,
        ) if is_sdxl else diffusers.OnnxRuntimeModel.from_pretrained(
            path,
            **kwargs_ort,
        )

    return attribute.from_pretrained(path)


def load_submodels(path: os.PathLike, is_sdxl: bool, init_dict: dict[str, type], **kwargs_ort):
    loaded = {}

    for k, v in init_dict.items():
        if not isinstance(v, list):
            loaded[k] = v
            continue
        try:
            loaded[k] = load_submodel(path, is_sdxl, k, v, **kwargs_ort)
        except Exception:
            pass

    return loaded


def load_pipeline(cls: type[diffusers.DiffusionPipeline], path: os.PathLike, **kwargs_ort) -> diffusers.DiffusionPipeline:
    if os.path.isdir(path):
        return cls(**patch_kwargs(cls, load_submodels(path, check_pipeline_sdxl(cls), load_init_dict(cls, path), **kwargs_ort)))
    else:
        return cls.from_single_file(path)


def patch_kwargs(cls: type[diffusers.DiffusionPipeline], kwargs: dict) -> dict:
    if cls == diffusers.OnnxStableDiffusionPipeline or cls == diffusers.OnnxStableDiffusionImg2ImgPipeline or cls == diffusers.OnnxStableDiffusionInpaintPipeline:
        kwargs["safety_checker"] = None
        kwargs["requires_safety_checker"] = False

    if cls == diffusers.OnnxStableDiffusionXLPipeline or cls == diffusers.OnnxStableDiffusionXLImg2ImgPipeline:
        kwargs["config"] = {}

    return kwargs


def get_base_constructor(cls: type[diffusers.DiffusionPipeline], is_refiner: bool):
    if cls == diffusers.OnnxStableDiffusionImg2ImgPipeline or cls == diffusers.OnnxStableDiffusionInpaintPipeline:
        return diffusers.OnnxStableDiffusionPipeline

    if cls == diffusers.OnnxStableDiffusionXLImg2ImgPipeline and not is_refiner:
        return diffusers.OnnxStableDiffusionXLPipeline

    return cls


def get_io_config(submodel: str, is_sdxl: bool):
    from modules.paths import sd_configs_path

    with open(os.path.join(sd_configs_path, "olive", 'sdxl' if is_sdxl else 'sd', f"{submodel}.json"), encoding="utf-8") as config_file:
        io_config: dict[str, Any] = json.load(config_file)["input_model"]["config"]["io_config"]

    for axe in io_config["dynamic_axes"]:
        io_config["dynamic_axes"][axe] = { int(k): v for k, v in io_config["dynamic_axes"][axe].items() }

    return io_config