import os
import sys
import threading
import time
import importlib
import signal
import re
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.middleware.gzip import GZipMiddleware

from modules import import_hook, errors
from modules.call_queue import wrap_queued_call, queue_lock, wrap_gradio_gpu_call
from modules.paths import script_path

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.__version__ = re.search(r'[\d.]+', torch.__version__).group(0)

from modules import shared, devices, sd_samplers, upscaler, extensions, localization, ui_tempdir
import modules.codeformer_model as codeformer
import modules.extras
import modules.face_restoration
import modules.gfpgan_model as gfpgan
import modules.img2img

import modules.lowvram
import modules.paths
import modules.scripts
import modules.sd_hijack
import modules.sd_models
import modules.sd_vae
import modules.txt2img
import modules.script_callbacks

import modules.ui
from modules import modelloader
from modules.shared import cmd_opts
import modules.hypernetworks.hypernetwork


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


def initialize():
    extensions.list_extensions()
    localization.list_localizations(cmd_opts.localizations_dir)

    if cmd_opts.ui_debug_mode:
        shared.sd_upscalers = upscaler.UpscalerLanczos().scalers
        modules.scripts.load_scripts()
        return

    modelloader.cleanup_models()
    modules.sd_models.setup_model()
    codeformer.setup_model(cmd_opts.codeformer_models_path)
    gfpgan.setup_model(cmd_opts.gfpgan_models_path)
    shared.face_restorers.append(modules.face_restoration.FaceRestoration())

    modelloader.list_builtin_upscalers()
    modules.scripts.load_scripts()
    modelloader.load_upscalers()

    modules.sd_vae.refresh_vae_list()

    try:
        modules.sd_models.load_model()
    except Exception as e:
        errors.display(e, "loading stable diffusion model")
        print("", file=sys.stderr)
        print("Stable diffusion model failed to load, exiting", file=sys.stderr)
        exit(1)

    shared.opts.onchange("sd_model_checkpoint", wrap_queued_call(lambda: modules.sd_models.reload_model_weights()))
    shared.opts.onchange("sd_vae", wrap_queued_call(lambda: modules.sd_vae.reload_vae_weights()), call=False)
    shared.opts.onchange("sd_vae_as_default", wrap_queued_call(lambda: modules.sd_vae.reload_vae_weights()), call=False)
    shared.opts.onchange("sd_hypernetwork", wrap_queued_call(lambda: shared.reload_hypernetworks()))
    shared.opts.onchange("sd_hypernetwork_strength", modules.hypernetworks.hypernetwork.apply_strength)
    shared.opts.onchange("temp_dir", ui_tempdir.on_tmpdir_changed)

    if cmd_opts.tls_keyfile is not None and cmd_opts.tls_keyfile is not None:

        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")

    # make the program just exit at ctrl+c without waiting for anything
    def sigint_handler(sig, frame):
        print(f'Interrupted with signal {sig} in {frame}')
        os._exit(0)

    signal.signal(signal.SIGINT, sigint_handler)


def setup_cors(app):
    if cmd_opts.cors_allow_origins and cmd_opts.cors_allow_origins_regex:
        app.add_middleware(CORSMiddleware, allow_origins=cmd_opts.cors_allow_origins.split(','), allow_origin_regex=cmd_opts.cors_allow_origins_regex, allow_methods=['*'], allow_credentials=True, allow_headers=['*'])
    elif cmd_opts.cors_allow_origins:
        app.add_middleware(CORSMiddleware, allow_origins=cmd_opts.cors_allow_origins.split(','), allow_methods=['*'], allow_credentials=True, allow_headers=['*'])
    elif cmd_opts.cors_allow_origins_regex:
        app.add_middleware(CORSMiddleware, allow_origin_regex=cmd_opts.cors_allow_origins_regex, allow_methods=['*'], allow_credentials=True, allow_headers=['*'])


def create_api(app):
    from modules.api.api import Api
    api = Api(app, queue_lock)
    return api


def wait_on_server(demo=None):
    while 1:
        time.sleep(0.5)
        if shared.state.need_restart:
            shared.state.need_restart = False
            time.sleep(0.5)
            demo.close()
            time.sleep(0.5)
            break


def api_only():
    initialize()

    app = FastAPI()
    setup_cors(app)
    app.add_middleware(GZipMiddleware, minimum_size=1000)
    api = create_api(app)

    modules.script_callbacks.app_started_callback(None, app)

    api.launch(server_name="0.0.0.0" if cmd_opts.listen else "127.0.0.1", port=cmd_opts.port if cmd_opts.port else 7861)


def webui():
    launch_api = cmd_opts.api
    initialize()

    while 1:
        if shared.opts.clean_temp_dir_at_start:
            ui_tempdir.cleanup_tmpdr()

        shared.demo = modules.ui.create_ui()

        app, local_url, share_url = shared.demo.queue(default_enabled=False).launch(
            share=cmd_opts.share,
            server_name=server_name,
            server_port=cmd_opts.port,
            ssl_keyfile=cmd_opts.tls_keyfile,
            ssl_certfile=cmd_opts.tls_certfile,
            debug=cmd_opts.gradio_debug,
            auth=[tuple(cred.split(':')) for cred in cmd_opts.gradio_auth.strip('"').split(',')] if cmd_opts.gradio_auth else None,
            inbrowser=cmd_opts.autolaunch,
            prevent_thread_lock=True
        )
        # after initial launch, disable --autolaunch for subsequent restarts
        cmd_opts.autolaunch = False

        # gradio uses a very open CORS policy via app.user_middleware, which makes it possible for
        # an attacker to trick the user into opening a malicious HTML page, which makes a request to the
        # running web ui and do whatever the attacker wants, including installing an extension and
        # running its code. We disable this here. Suggested by RyotaK.
        app.user_middleware = [x for x in app.user_middleware if x.cls.__name__ != 'CORSMiddleware']

        setup_cors(app)

        app.add_middleware(GZipMiddleware, minimum_size=1000)

        if launch_api:
            create_api(app)

        modules.script_callbacks.app_started_callback(shared.demo, app)
        modules.script_callbacks.app_started_callback(shared.demo, app)

        wait_on_server(shared.demo)
        print('Restarting UI...')

        sd_samplers.set_samplers()

        modules.script_callbacks.script_unloaded_callback()
        extensions.list_extensions()

        localization.list_localizations(cmd_opts.localizations_dir)

        modelloader.forbid_loaded_nonbuiltin_upscalers()
        modules.scripts.reload_scripts()
        modules.script_callbacks.model_loaded_callback(shared.sd_model)
        modelloader.load_upscalers()

        for module in [module for name, module in sys.modules.items() if name.startswith("modules.ui")]:
            importlib.reload(module)

        modules.sd_models.list_models()


if __name__ == "__main__":
    if cmd_opts.nowebui:
        api_only()
    else:
        webui()