from __future__ import annotations

import importlib
import logging
import os
import shutil
import sys
import time
import types
from contextlib import contextmanager
from typing import Dict, List, Iterable
from os.path import join, basename, dirname, isdir, isfile, exists, abspath, split, splitext, realpath

from . import base_nodes
from .package_typing import ExportedNodes
from ..component_model.plugins import prompt_server_instance_routes


class _PromptServerStub():
    def __init__(self):
        self.routes = prompt_server_instance_routes


def _vanilla_load_importing_execute_prestartup_script(node_paths: Iterable[str]) -> None:
    def execute_script(script_path):
        module_name = splitext(script_path)[0]
        try:
            spec = importlib.util.spec_from_file_location(module_name, script_path)
            module = importlib.util.module_from_spec(spec)
            spec.loader.exec_module(module)
            return True
        except Exception as e:
            print(f"Failed to execute startup-script: {script_path} / {e}", file=sys.stderr)
        return False

    node_prestartup_times = []
    for custom_node_path in node_paths:
        # patched
        if not isdir(custom_node_path):
            continue
        # end patch
        possible_modules = os.listdir(custom_node_path)

        for possible_module in possible_modules:
            module_path = join(custom_node_path, possible_module)
            if isfile(module_path) or module_path.endswith(".disabled") or module_path == "__pycache__":
                continue

            script_path = join(module_path, "prestartup_script.py")
            if exists(script_path):
                time_before = time.perf_counter()
                success = execute_script(script_path)
                node_prestartup_times.append((time.perf_counter() - time_before, module_path, success))
    if len(node_prestartup_times) > 0:
        print("\nPrestartup times for custom nodes:", file=sys.stderr)
        for n in sorted(node_prestartup_times):
            if n[2]:
                import_message = ""
            else:
                import_message = " (PRESTARTUP FAILED)"
            print("{:6.1f} seconds{}:".format(n[0], import_message), n[1], file=sys.stderr)
        print("\n", file=sys.stderr)


@contextmanager
def _exec_mitigations(module: types.ModuleType, module_path: str) -> ExportedNodes:
    if module.__name__ == "ComfyUI-Manager":
        from ..cmd import folder_paths
        old_file = folder_paths.__file__

        try:
            # mitigate path
            new_path = join(abspath(join(dirname(old_file), "..", "..")), basename(old_file))
            folder_paths.__file__ = new_path
            # mitigate JS copy
            sys.modules['nodes'].EXTENSION_WEB_DIRS = {}
            yield ExportedNodes()
        finally:
            folder_paths.__file__ = old_file
            # todo: mitigate "/manager/reboot"
            # todo: mitigate process_wrap
    else:
        yield ExportedNodes()


def _vanilla_load_custom_nodes_1(module_path, ignore=set()) -> ExportedNodes:
    exported_nodes = ExportedNodes()
    module_name = basename(module_path)
    if isfile(module_path):
        sp = splitext(module_path)
        module_name = sp[0]
    try:
        if isfile(module_path):
            module_spec = importlib.util.spec_from_file_location(module_name, module_path)
            module_dir = split(module_path)[0]
        else:
            module_spec = importlib.util.spec_from_file_location(module_name, join(module_path, "__init__.py"))
            module_dir = module_path

        module = importlib.util.module_from_spec(module_spec)
        sys.modules[module_name] = module

        with _exec_mitigations(module, module_path) as mitigated_exported_nodes:
            module_spec.loader.exec_module(module)
            exported_nodes.update(mitigated_exported_nodes)

        if hasattr(module, "WEB_DIRECTORY") and getattr(module, "WEB_DIRECTORY") is not None:
            web_dir = abspath(join(module_dir, getattr(module, "WEB_DIRECTORY")))
            if isdir(web_dir):
                exported_nodes.EXTENSION_WEB_DIRS[module_name] = web_dir

        if hasattr(module, "NODE_CLASS_MAPPINGS") and getattr(module, "NODE_CLASS_MAPPINGS") is not None:
            for name in module.NODE_CLASS_MAPPINGS:
                if name not in ignore:
                    exported_nodes.NODE_CLASS_MAPPINGS[name] = module.NODE_CLASS_MAPPINGS[name]
            if hasattr(module, "NODE_DISPLAY_NAME_MAPPINGS") and getattr(module,
                                                                         "NODE_DISPLAY_NAME_MAPPINGS") is not None:
                exported_nodes.NODE_DISPLAY_NAME_MAPPINGS.update(module.NODE_DISPLAY_NAME_MAPPINGS)
            return exported_nodes
        else:
            print(f"Skip {module_path} module for custom nodes due to the lack of NODE_CLASS_MAPPINGS.", file=sys.stderr)
            return exported_nodes
    except Exception as e:
        import traceback
        print(traceback.format_exc())
        print(f"Cannot import {module_path} module for custom nodes:", e, file=sys.stderr)
        return exported_nodes


def _vanilla_load_custom_nodes_2(node_paths: Iterable[str]) -> ExportedNodes:
    base_node_names = set(base_nodes.NODE_CLASS_MAPPINGS.keys())
    node_import_times = []
    exported_nodes = ExportedNodes()
    for custom_node_path in node_paths:
        if not exists(custom_node_path) or not isdir(custom_node_path):
            continue
        possible_modules = os.listdir(realpath(custom_node_path))
        if "__pycache__" in possible_modules:
            possible_modules.remove("__pycache__")

        for possible_module in possible_modules:
            module_path = join(custom_node_path, possible_module)
            if isfile(module_path) and splitext(module_path)[1] != ".py": continue
            if module_path.endswith(".disabled"): continue
            time_before = time.perf_counter()
            possible_exported_nodes = _vanilla_load_custom_nodes_1(module_path, base_node_names)
            # comfyui-manager mitigation
            import_succeeded = len(possible_exported_nodes.NODE_CLASS_MAPPINGS) > 0 or "ComfyUI-Manager" in module_path
            node_import_times.append(
                (time.perf_counter() - time_before, module_path, import_succeeded))
            exported_nodes.update(possible_exported_nodes)

    if len(node_import_times) > 0:
        print("\nImport times for custom nodes:", file=sys.stderr)
        for n in sorted(node_import_times):
            if n[2]:
                import_message = ""
            else:
                import_message = " (IMPORT FAILED)"
            print("{:6.1f} seconds{}:".format(n[0], import_message), n[1], file=sys.stderr)
        print("\n", file=sys.stderr)
    return exported_nodes


def mitigated_import_of_vanilla_custom_nodes() -> ExportedNodes:
    # only vanilla custom nodes will ever go into the custom_nodes directory
    # this mitigation puts files that custom nodes expects are at the root of the repository back where they should be
    # found. we're in the middle of executing the import of execution and server, in all likelihood, so like all things,
    # the way community custom nodes is pretty radioactive
    from ..cmd import cuda_malloc, folder_paths, latent_preview
    from .. import graph, graph_utils, caching
    from .. import node_helpers
    from .. import __version__
    for module in (cuda_malloc, folder_paths, latent_preview, node_helpers):
        module_short_name = module.__name__.split(".")[-1]
        sys.modules[module_short_name] = module
    sys.modules['nodes'] = base_nodes
    sys.modules['comfy_execution.graph'] = graph
    sys.modules['comfy_execution.graph_utils'] = graph_utils
    sys.modules['comfy_execution.caching'] = caching
    comfyui_version = types.ModuleType('comfyui_version', '')
    setattr(comfyui_version, "__version__", __version__)
    sys.modules['comfyui_version'] = comfyui_version
    from ..cmd import execution, server
    for module in (execution, server):
        module_short_name = module.__name__.split(".")[-1]
        sys.modules[module_short_name] = module

    if server.PromptServer.instance is None:
        server.PromptServer.instance = _PromptServerStub()

    # Impact Pack wants to find model_patcher
    from .. import model_patcher
    sys.modules['model_patcher'] = model_patcher

    comfy_extras_mitigation: Dict[str, types.ModuleType] = {}

    import comfy_extras
    for module_name, module in sys.modules.items():
        if not module_name.startswith("comfy_extras.nodes"):
            continue
        module_short_name = module_name.split(".")[-1]
        setattr(comfy_extras, module_short_name, module)
        comfy_extras_mitigation[f'comfy_extras.{module_short_name}'] = module
    sys.modules.update(comfy_extras_mitigation)
    node_paths = folder_paths.get_folder_paths("custom_nodes")

    potential_git_dir_parent = join(dirname(__file__), "..", "..")
    is_git_repository = exists(join(potential_git_dir_parent, ".git"))
    if is_git_repository:
        node_paths += [abspath(join(potential_git_dir_parent, "custom_nodes"))]

    node_paths = frozenset(abspath(custom_node_path) for custom_node_path in node_paths)

    _vanilla_load_importing_execute_prestartup_script(node_paths)
    vanilla_custom_nodes = _vanilla_load_custom_nodes_2(node_paths)
    return vanilla_custom_nodes