import json
import os
import signal
import sys
import re

from modules.timer import startup_timer
from modules import patches
from functools import wraps


def gradio_server_name():
    from modules.shared_cmd_options import cmd_opts

    if cmd_opts.server_name:
        return cmd_opts.server_name
    else:
        return "0.0.0.0" if cmd_opts.listen else None


def fix_torch_version():
    import torch

    # Truncate version number of nightly/local build of PyTorch to not cause exceptions with CodeFormer or Safetensors
    if ".dev" in torch.__version__ or "+git" in torch.__version__:
        torch.__long_version__ = torch.__version__
        torch.__version__ = re.search(r'[\d.]+[\d]', torch.__version__).group(0)

def fix_pytorch_lightning():
    # Checks if pytorch_lightning.utilities.distributed already exists in the sys.modules cache
    if 'pytorch_lightning.utilities.distributed' not in sys.modules:
        import pytorch_lightning
        # Lets the user know that the library was not found and then will set it to pytorch_lightning.utilities.rank_zero
        print("Pytorch_lightning.distributed not found, attempting pytorch_lightning.rank_zero")
        sys.modules["pytorch_lightning.utilities.distributed"] = pytorch_lightning.utilities.rank_zero

def fix_asyncio_event_loop_policy():
    """
        The default `asyncio` event loop policy only automatically creates
        event loops in the main threads. Other threads must create event
        loops explicitly or `asyncio.get_event_loop` (and therefore
        `.IOLoop.current`) will fail. Installing this policy allows event
        loops to be created automatically on any thread, matching the
        behavior of Tornado versions prior to 5.0 (or 5.0 on Python 2).
    """

    import asyncio

    if sys.platform == "win32" and hasattr(asyncio, "WindowsSelectorEventLoopPolicy"):
        # "Any thread" and "selector" should be orthogonal, but there's not a clean
        # interface for composing policies so pick the right base.
        _BasePolicy = asyncio.WindowsSelectorEventLoopPolicy  # type: ignore
    else:
        _BasePolicy = asyncio.DefaultEventLoopPolicy

    class AnyThreadEventLoopPolicy(_BasePolicy):  # type: ignore
        """Event loop policy that allows loop creation on any thread.
        Usage::

            asyncio.set_event_loop_policy(AnyThreadEventLoopPolicy())
        """

        def get_event_loop(self) -> asyncio.AbstractEventLoop:
            try:
                return super().get_event_loop()
            except (RuntimeError, AssertionError):
                # This was an AssertionError in python 3.4.2 (which ships with debian jessie)
                # and changed to a RuntimeError in 3.4.3.
                # "There is no current event loop in thread %r"
                loop = self.new_event_loop()
                self.set_event_loop(loop)
                return loop

    asyncio.set_event_loop_policy(AnyThreadEventLoopPolicy())


def restore_config_state_file():
    from modules import shared, config_states

    config_state_file = shared.opts.restore_config_state_file
    if config_state_file == "":
        return

    shared.opts.restore_config_state_file = ""
    shared.opts.save(shared.config_filename)

    if os.path.isfile(config_state_file):
        print(f"*** About to restore extension state from file: {config_state_file}")
        with open(config_state_file, "r", encoding="utf-8") as f:
            config_state = json.load(f)
            config_states.restore_extension_config(config_state)
        startup_timer.record("restore extension config")
    elif config_state_file:
        print(f"!!! Config state backup not found: {config_state_file}")


def validate_tls_options():
    from modules.shared_cmd_options import cmd_opts

    if not (cmd_opts.tls_keyfile and cmd_opts.tls_certfile):
        return

    try:
        if not os.path.exists(cmd_opts.tls_keyfile):
            print("Invalid path to TLS keyfile given")
        if not os.path.exists(cmd_opts.tls_certfile):
            print(f"Invalid path to TLS certfile: '{cmd_opts.tls_certfile}'")
    except TypeError:
        cmd_opts.tls_keyfile = cmd_opts.tls_certfile = None
        print("TLS setup invalid, running webui without TLS")
    else:
        print("Running with TLS")
    startup_timer.record("TLS")


def get_gradio_auth_creds():
    """
    Convert the gradio_auth and gradio_auth_path commandline arguments into
    an iterable of (username, password) tuples.
    """
    from modules.shared_cmd_options import cmd_opts

    def process_credential_line(s):
        s = s.strip()
        if not s:
            return None
        return tuple(s.split(':', 1))

    if cmd_opts.gradio_auth:
        for cred in cmd_opts.gradio_auth.split(','):
            cred = process_credential_line(cred)
            if cred:
                yield cred

    if cmd_opts.gradio_auth_path:
        with open(cmd_opts.gradio_auth_path, 'r', encoding="utf8") as file:
            for line in file.readlines():
                for cred in line.strip().split(','):
                    cred = process_credential_line(cred)
                    if cred:
                        yield cred


def dumpstacks():
    import threading
    import traceback

    id2name = {th.ident: th.name for th in threading.enumerate()}
    code = []
    for threadId, stack in sys._current_frames().items():
        code.append(f"\n# Thread: {id2name.get(threadId, '')}({threadId})")
        for filename, lineno, name, line in traceback.extract_stack(stack):
            code.append(f"""File: "{filename}", line {lineno}, in {name}""")
            if line:
                code.append("  " + line.strip())

    print("\n".join(code))


def configure_sigint_handler():
    # make the program just exit at ctrl+c without waiting for anything

    from modules import shared

    def sigint_handler(sig, frame):
        print(f'Interrupted with signal {sig} in {frame}')

        if shared.opts.dump_stacks_on_signal:
            dumpstacks()

        os._exit(0)

    if not os.environ.get("COVERAGE_RUN"):
        # Don't install the immediate-quit handler when running under coverage,
        # as then the coverage report won't be generated.
        signal.signal(signal.SIGINT, sigint_handler)


def configure_opts_onchange():
    from modules import shared, sd_models, sd_vae, ui_tempdir, sd_hijack
    from modules.call_queue import wrap_queued_call

    shared.opts.onchange("sd_model_checkpoint", wrap_queued_call(lambda: sd_models.reload_model_weights()), call=False)
    shared.opts.onchange("sd_vae", wrap_queued_call(lambda: sd_vae.reload_vae_weights()), call=False)
    shared.opts.onchange("sd_vae_overrides_per_model_preferences", wrap_queued_call(lambda: sd_vae.reload_vae_weights()), call=False)
    shared.opts.onchange("temp_dir", ui_tempdir.on_tmpdir_changed)
    shared.opts.onchange("gradio_theme", shared.reload_gradio_theme)
    shared.opts.onchange("cross_attention_optimization", wrap_queued_call(lambda: sd_hijack.model_hijack.redo_hijack(shared.sd_model)), call=False)
    shared.opts.onchange("fp8_storage", wrap_queued_call(lambda: sd_models.reload_model_weights()), call=False)
    shared.opts.onchange("cache_fp16_weight", wrap_queued_call(lambda: sd_models.reload_model_weights(forced_reload=True)), call=False)
    startup_timer.record("opts onchange")


def setup_middleware(app):
    from starlette.middleware.gzip import GZipMiddleware
    app.add_middleware(GZipMiddleware, minimum_size=1000)
    configure_cors_middleware(app)


def configure_cors_middleware(app):
    from starlette.middleware.cors import CORSMiddleware
    from modules.shared_cmd_options import cmd_opts

    cors_options = {
        "allow_methods": ["*"],
        "allow_headers": ["*"],
        "allow_credentials": True,
    }
    if cmd_opts.cors_allow_origins:
        cors_options["allow_origins"] = cmd_opts.cors_allow_origins.split(',')
    if cmd_opts.cors_allow_origins_regex:
        cors_options["allow_origin_regex"] = cmd_opts.cors_allow_origins_regex
    app.add_middleware(CORSMiddleware, **cors_options)


def allow_add_middleware_after_start():
    from starlette.applications import Starlette

    def add_middleware_wrapper(func):
        """Patch Starlette.add_middleware to allow for middleware to be added after the app has started

        Starlette.add_middleware raises RuntimeError("Cannot add middleware after an application has started") if middleware_stack is not None.
        We can force add new middleware by first setting middleware_stack to None, then adding the middleware.
        When middleware_stack is None, it will rebuild the middleware_stack on the next request (Lazily build middleware stack).

        If packages are updated in the future, things may break, so we have two ways to add middleware after the app has started:
        the first way is to just set middleware_stack to None and then retry
        the second manually insert the middleware into the user_middleware list without calling add_middleware
        """

        @wraps(func)
        def wrapper(self, *args, **kwargs):
            res = None
            try:
                res = func(self, *args, **kwargs)
            except RuntimeError as _:
                try:
                    self.middleware_stack = None
                    res = func(self, *args, **kwargs)
                except RuntimeError as e:
                    print(f'Warning: "{e}", Retrying...')
                    from starlette.middleware import Middleware
                    self.user_middleware.insert(0, Middleware(*args, **kwargs))
                self.middleware_stack = None  # ensure middleware_stack in the event of concurrent requests
            return res

        return wrapper

    patches.patch(__name__, obj=Starlette, field="add_middleware", replacement=add_middleware_wrapper(Starlette.add_middleware))