import os
import sys
import warnings
from typing import Any, Mapping, Sequence, Union


def find_path(name: str, path: str = None) -> str:
    """Recursively search parent folders until the named entry is found."""
    if path is None:
        path = os.getcwd()

    if name in os.listdir(path):
        path_name = os.path.join(path, name)
        print(f"{name} found: {path_name}")
        return path_name

    parent_directory = os.path.dirname(path)
    if parent_directory == path:
        return None

    return find_path(name, parent_directory)


def get_comfyui_path() -> str:
    """Return the configured ComfyUI path, preferring COMFYUI_PATH when set."""
    comfyui_path = os.environ.get("COMFYUI_PATH")
    if comfyui_path:
        return comfyui_path
    return find_path("ComfyUI")


def add_comfyui_directory_to_sys_path() -> None:
    """Add the ComfyUI checkout to sys.path."""
    comfyui_path = get_comfyui_path()
    if comfyui_path is not None and os.path.isdir(comfyui_path):
        if comfyui_path in sys.path:
            sys.path.remove(comfyui_path)
        sys.path.insert(0, comfyui_path)
        print(f"'{comfyui_path}' added to sys.path")


def add_extra_model_paths() -> None:
    """Load ComfyUI extra model paths configuration when available."""
    try:
        from main import load_extra_path_config
    except ImportError:
        print(
            "Could not import load_extra_path_config from main.py. Looking in utils.extra_config instead."
        )
        from utils.extra_config import load_extra_path_config

    extra_model_paths = find_path("extra_model_paths.yaml")
    if extra_model_paths is not None:
        load_extra_path_config(extra_model_paths)
    else:
        print("Could not find the extra_model_paths config file.")


def bootstrap_comfyui_runtime() -> None:
    """Mirror the allocator-related ComfyUI startup steps before torch import."""
    add_comfyui_directory_to_sys_path()

    import comfy.options

    comfy.options.enable_args_parsing()

    from comfy.cli_args import args

    if os.name == "nt":
        os.environ["MIMALLOC_PURGE_DELAY"] = "0"

    if args.default_device is not None:
        default_dev = args.default_device
        devices = list(range(32))
        devices.remove(default_dev)
        devices.insert(0, default_dev)
        devices = ",".join(map(str, devices))
        os.environ["CUDA_VISIBLE_DEVICES"] = str(devices)
        os.environ["HIP_VISIBLE_DEVICES"] = str(devices)

    if args.cuda_device is not None:
        os.environ["CUDA_VISIBLE_DEVICES"] = str(args.cuda_device)
        os.environ["HIP_VISIBLE_DEVICES"] = str(args.cuda_device)
        os.environ["ASCEND_RT_VISIBLE_DEVICES"] = str(args.cuda_device)

    if args.oneapi_device_selector is not None:
        os.environ["ONEAPI_DEVICE_SELECTOR"] = args.oneapi_device_selector

    if args.deterministic and "CUBLAS_WORKSPACE_CONFIG" not in os.environ:
        os.environ["CUBLAS_WORKSPACE_CONFIG"] = ":4096:8"

    import cuda_malloc

    if "rocm" in cuda_malloc.get_torch_version_noimport():
        os.environ["OCL_SET_SVM_SIZE"] = "262144"


def cleanup_comfyui_runtime(unload_models: bool | None = None) -> None:
    """Best-effort cleanup for embedded or repeated generated-script execution."""
    import gc

    def run_cleanup_hook(name: str, should_run: bool = True) -> None:
        if not should_run or not hasattr(model_management, name):
            return
        cleanup_fn = getattr(model_management, name)
        try:
            cleanup_fn()
        except Exception as exc:
            warnings.warn(
                f"ComfyUI cleanup hook {name} failed during teardown: {exc}",
                RuntimeWarning,
                stacklevel=2,
            )

    should_unload = unload_models
    if should_unload is None:
        should_unload = os.environ.get("COMFYUI_TOPYTHON_UNLOAD_MODELS", "").lower() in {
            "1",
            "true",
            "yes",
            "on",
        }

    try:
        import comfy.model_management as model_management
    except ModuleNotFoundError:
        gc.collect()
        return

    run_cleanup_hook("cleanup_models_gc")
    run_cleanup_hook("unload_all_models", should_run=should_unload)
    run_cleanup_hook("soft_empty_cache")
    gc.collect()


def import_custom_nodes() -> None:
    """Initialize ComfyUI custom nodes in the exporter runtime."""
    comfyui_path = get_comfyui_path()
    if comfyui_path and comfyui_path not in sys.path:
        sys.path.insert(0, comfyui_path)

    import asyncio
    import execution
    from nodes import init_extra_nodes

    if comfyui_path in sys.path:
        sys.path.remove(comfyui_path)
    sys.path.insert(0, comfyui_path)

    import server

    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    server_instance = server.PromptServer(loop)
    execution.PromptQueue(server_instance)
    asyncio.run(init_extra_nodes())


def get_node_class_mappings() -> dict:
    """Load ComfyUI node mappings on demand."""
    add_comfyui_directory_to_sys_path()
    from nodes import NODE_CLASS_MAPPINGS

    return NODE_CLASS_MAPPINGS


def get_value_at_index(obj: Union[Sequence, Mapping], index: int) -> Any:
    """Return a sequence or mapping result item by index."""
    try:
        return obj[index]
    except KeyError:
        return obj["result"][index]