#
# Copyright 2016 The BigDL Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# This file is adapted from
# https://github.com/oobabooga/text-generation-webui/blob/main/server.py


import os
import warnings

from modules import shared

import accelerate  # This early import makes Intel GPUs happy

from modules.block_requests import OpenMonkeyPatch, RequestBlocker
from modules.logging_colors import logger

os.environ['GRADIO_ANALYTICS_ENABLED'] = 'False'
os.environ['BITSANDBYTES_NOWELCOME'] = '1'
warnings.filterwarnings('ignore', category=UserWarning, message='TypedStorage is deprecated')
warnings.filterwarnings('ignore', category=UserWarning, message='Using the update method is deprecated')
warnings.filterwarnings('ignore', category=UserWarning, message='Field "model_name" has conflict')
warnings.filterwarnings('ignore', category=UserWarning, message='The value passed into gr.Dropdown()')
warnings.filterwarnings('ignore', category=UserWarning, message='Field "model_names" has conflict')

with RequestBlocker():
    import gradio as gr

import matplotlib

matplotlib.use('Agg')  # This fixes LaTeX rendering on some systems

import json
import os
import signal
import sys
import time
from functools import partial
from pathlib import Path
from threading import Lock

import yaml

import modules.extensions as extensions_module
from modules import chat, utils
from modules import (
    ui,
    ui_chat,
    ui_default,
    ui_file_saving,
    ui_model_menu,
    ui_notebook,
    ui_parameters,
    ui_session,
)
from modules.extensions import apply_extensions
from modules.models import load_model
from modules.models_settings import (
    get_fallback_settings,
    get_model_metadata,
    update_model_parameters
)
from modules.shared import do_cmd_flags_warnings
from modules.utils import gradio


def signal_handler(sig, frame):
    logger.info("Received Ctrl+C. Shutting down Text generation web UI gracefully.")
    sys.exit(0)

signal.signal(signal.SIGINT, signal_handler)

def create_interface():

    title = 'Text generation web UI'

    # Password authentication
    auth = []
    if shared.args.gradio_auth:
        auth.extend(x.strip() for x in shared.args.gradio_auth.strip('"').replace('\n', '').split(',') if x.strip())
    if shared.args.gradio_auth_path:
        with open(shared.args.gradio_auth_path, 'r', encoding="utf8") as file:
            auth.extend(x.strip() for line in file for x in line.split(',') if x.strip())
    auth = [tuple(cred.split(':')) for cred in auth]

    # Import the extensions and execute their setup() functions
    if shared.args.extensions is not None and len(shared.args.extensions) > 0:
        extensions_module.load_extensions()

    # Force some events to be triggered on page load
    shared.persistent_interface_state.update({
        'loader': shared.args.loader or 'BigDL-LLM',
        'mode': shared.settings['mode'],
        'character_menu': shared.args.character or shared.settings['character'],
        'instruction_template_str': shared.settings['instruction_template_str'],
        'prompt_menu-default': shared.settings['prompt-default'],
        'prompt_menu-notebook': shared.settings['prompt-notebook'],
        'filter_by_loader': shared.args.loader or 'All'
    })

    if Path("cache/pfp_character.png").exists():
        Path("cache/pfp_character.png").unlink()

    # css/js strings
    css = ui.css
    js = ui.js
    css += apply_extensions('css')
    js += apply_extensions('js')

    # Interface state elements
    shared.input_elements = ui.list_interface_input_elements()

    with gr.Blocks(css=css, analytics_enabled=False, title=title, theme=ui.theme) as shared.gradio['interface']:

        # Interface state
        shared.gradio['interface_state'] = gr.State({k: None for k in shared.input_elements})

        # Audio notification
        if Path("notification.mp3").exists():
            shared.gradio['audio_notification'] = gr.Audio(interactive=False, value="notification.mp3", elem_id="audio_notification", visible=False)

        # Floating menus for saving/deleting files
        ui_file_saving.create_ui()

        # Temporary clipboard for saving files
        shared.gradio['temporary_text'] = gr.Textbox(visible=False)

        # Text Generation tab
        ui_chat.create_ui()
        ui_default.create_ui()
        ui_notebook.create_ui()

        ui_parameters.create_ui(shared.settings['preset'])  # Parameters tab
        ui_model_menu.create_ui()  # Model tab
        ui_session.create_ui()  # Session tab

        # Generation events
        ui_chat.create_event_handlers()
        ui_default.create_event_handlers()
        ui_notebook.create_event_handlers()

        # Other events
        ui_file_saving.create_event_handlers()
        ui_parameters.create_event_handlers()
        ui_model_menu.create_event_handlers()

        # Interface launch events
        if shared.settings['dark_theme']:
            shared.gradio['interface'].load(lambda: None, None, None, _js="() => document.getElementsByTagName('body')[0].classList.add('dark')")

        shared.gradio['interface'].load(lambda: None, None, None, _js=f"() => {{{js}}}")
        shared.gradio['interface'].load(None, gradio('show_controls'), None, _js=f'(x) => {{{ui.show_controls_js}; toggle_controls(x)}}')
        shared.gradio['interface'].load(partial(ui.apply_interface_values, {}, use_persistent=True), None, gradio(ui.list_interface_input_elements()), show_progress=False)
        shared.gradio['interface'].load(chat.redraw_html, gradio(ui_chat.reload_arr), gradio('display'))

        extensions_module.create_extensions_tabs()  # Extensions tabs
        extensions_module.create_extensions_block()  # Extensions block

    # Launch the interface
    shared.gradio['interface'].queue(concurrency_count=64)
    with OpenMonkeyPatch():
        shared.gradio['interface'].launch(
            prevent_thread_lock=True,
            share=True,
            server_name=None if not shared.args.listen else (shared.args.listen_host or '0.0.0.0'),
            server_port=shared.args.listen_port,
            inbrowser=shared.args.auto_launch,
            auth=auth or None,
            ssl_verify=False if (shared.args.ssl_keyfile or shared.args.ssl_certfile) else True,
            ssl_keyfile=shared.args.ssl_keyfile,
            ssl_certfile=shared.args.ssl_certfile
        )


if __name__ == "__main__":

    logger.info("Starting Text generation web UI")
    do_cmd_flags_warnings()

    # Load custom settings
    settings_file = None
    if shared.args.settings is not None and Path(shared.args.settings).exists():
        settings_file = Path(shared.args.settings)
    elif Path('settings.yaml').exists():
        settings_file = Path('settings.yaml')
    elif Path('settings.json').exists():
        settings_file = Path('settings.json')

    if settings_file is not None:
        logger.info(f"Loading settings from {settings_file}")
        file_contents = open(settings_file, 'r', encoding='utf-8').read()
        new_settings = json.loads(file_contents) if settings_file.suffix == "json" else yaml.safe_load(file_contents)
        shared.settings.update(new_settings)

    # Fallback settings for models
    shared.model_config['.*'] = get_fallback_settings()
    shared.model_config.move_to_end('.*', last=False)  # Move to the beginning

    # Activate the extensions listed on settings.yaml
    extensions_module.available_extensions = utils.get_available_extensions()
    for extension in shared.settings['default_extensions']:
        shared.args.extensions = shared.args.extensions or []
        if extension not in shared.args.extensions:
            shared.args.extensions.append(extension)

    available_models = utils.get_available_models()

    # Model defined through --model
    if shared.args.model is not None:
        shared.model_name = shared.args.model

    # Select the model from a command-line menu
    elif shared.args.model_menu:
        if len(available_models) == 0:
            logger.error('No models are available! Please download at least one.')
            sys.exit(0)
        else:
            print('The following models are available:\n')
            for i, model in enumerate(available_models):
                print(f'{i+1}. {model}')

            print(f'\nWhich one do you want to load? 1-{len(available_models)}\n')
            i = int(input()) - 1
            print()

        shared.model_name = available_models[i]

    # If any model has been selected, load it
    if shared.model_name != 'None':
        p = Path(shared.model_name)
        if p.exists():
            model_name = p.parts[-1]
            shared.model_name = model_name
        else:
            model_name = shared.model_name

        model_settings = get_model_metadata(model_name)
        update_model_parameters(model_settings, initial=True)  # hijack the command-line arguments

        # Load the model
        shared.model, shared.tokenizer = load_model(model_name)

    shared.generation_lock = Lock()

    if shared.args.nowebui:
        # Start the API in standalone mode
        shared.args.extensions = [x for x in shared.args.extensions if x != 'gallery']
        if shared.args.extensions is not None and len(shared.args.extensions) > 0:
            extensions_module.load_extensions()
    else:
        # Launch the web UI
        create_interface()
        while True:
            time.sleep(0.5)
            if shared.need_restart:
                shared.need_restart = False
                time.sleep(0.5)
                shared.gradio['interface'].close()
                time.sleep(0.5)
                create_interface()