try:
    import gevent.monkey

    gevent.monkey.patch_all()
except ImportError:
    pass

import os
import sys
from pathlib import Path

import simplejson as json
from flask import Flask, jsonify, render_template, request

from llm_server.cluster.cluster_config import cluster_config
from llm_server.cluster.model_choices import get_model_choices
from llm_server.config.config import mode_ui_names
from llm_server.config.load import load_config
from llm_server.database.conn import database
from llm_server.database.create import create_db
from llm_server.pre_fork import server_startup
from llm_server.routes.openai import openai_bp
from llm_server.routes.server_error import handle_server_error
from llm_server.routes.v1 import bp
from llm_server.sock import init_socketio

# TODO: per-backend workers
# TODO: allow setting concurrent gens per-backend
# TODO: set the max tokens to that of the lowest backend
# TODO: implement RRD backend loadbalancer option
# TODO: have VLLM reject a request if it already has n == concurrent_gens running
# TODO: add a way to cancel VLLM gens. Maybe use websockets?
# TODO: use coloredlogs
# TODO: need to update opts. for workers
# TODO: add a healthcheck to VLLM
# TODO: allow choosing the model by the URL path
# TODO: have VLLM report context size, uptime

# Lower priority
# TODO: set VLLM to stream ALL data using socket.io. If the socket disconnects, cancel generation.
# TODO: estiamted wait time needs to account for full concurrent_gens but the queue is less than concurrent_gens
# TODO: the estiamted wait time lags behind the stats
# TODO: simulate OpenAI error messages regardless of endpoint
# TODO: send extra headers when ratelimited?
# TODO: make sure log_prompt() is used everywhere, including errors and invalid requests
# TODO: unify logging thread in a function and use async/await instead
# TODO: move the netdata stats to a seperate part of the stats and have it set to the currently selected backend
# TODO: have VLLM reply with stats (TPS, generated token count, processing time)
# TODO: add config reloading via stored redis variables

# Done, but need to verify
# TODO: add more excluding to SYSTEM__ tokens
# TODO: return 200 when returning formatted sillytavern error

try:
    import vllm
except ModuleNotFoundError as e:
    print('Could not import vllm-gptq:', e)
    print('Please see README.md for install instructions.')
    sys.exit(1)

import config
from llm_server import opts
from llm_server.helpers import auto_set_base_client_api
from llm_server.llm.vllm.info import vllm_info
from llm_server.custom_redis import flask_cache
from llm_server.llm import redis
from llm_server.routes.v1.generate_stats import generate_stats

app = Flask(__name__)
init_socketio(app)
app.register_blueprint(bp, url_prefix='/api/')
app.register_blueprint(openai_bp, url_prefix='/api/openai/v1/')
flask_cache.init_app(app)
flask_cache.clear()

script_path = os.path.dirname(os.path.realpath(__file__))
config_path_environ = os.getenv("CONFIG_PATH")
if config_path_environ:
    config_path = config_path_environ
else:
    config_path = Path(script_path, 'config', 'config.yml')

success, config, msg = load_config(config_path)
if not success:
    print('Failed to load config:', msg)
    sys.exit(1)

database.init_db(config['mysql']['host'], config['mysql']['username'], config['mysql']['password'], config['mysql']['database'])
create_db()


@app.route('/')
@app.route('/api')
@app.route('/api/openai')
@flask_cache.cached(timeout=10)
def home():
    base_client_api = redis.get('base_client_api', dtype=str)
    stats = generate_stats()

    model_choices, default_backend_info = get_model_choices()

    if default_backend_info['queued'] == 0 and default_backend_info['queued'] >= opts.concurrent_gens:
        # There will be a wait if the queue is empty but prompts are processing, but we don't
        # know how long.
        default_estimated_wait_sec = f"less than {int(default_backend_info['estimated_wait'])} seconds"
    else:
        default_estimated_wait_sec = f"{int(default_backend_info['estimated_wait'])} seconds"

    if len(config['analytics_tracking_code']):
        analytics_tracking_code = f"<script>\n{config['analytics_tracking_code']}\n</script>"
    else:
        analytics_tracking_code = ''

    if config['info_html']:
        info_html = config['info_html']
    else:
        info_html = ''

    mode_info = ''
    for k, v in cluster_config.all().items():
        if v['mode'] == 'vllm':
            mode_info = vllm_info
            break

    return render_template('home.html',
                           llm_middleware_name=opts.llm_middleware_name,
                           analytics_tracking_code=analytics_tracking_code,
                           info_html=info_html,
                           default_model=default_backend_info['model'],
                           default_active_gen_workers=default_backend_info['processing'],
                           default_proompters_in_queue=default_backend_info['queued'],
                           current_model=opts.manual_model_name if opts.manual_model_name else None,  # else running_model,
                           client_api=f'https://{base_client_api}/v1',
                           ws_client_api=f'wss://{base_client_api}/v1/stream' if opts.enable_streaming else 'disabled',
                           default_estimated_wait=default_estimated_wait_sec,
                           mode_name=mode_ui_names[opts.mode][0],
                           api_input_textbox=mode_ui_names[opts.mode][1],
                           streaming_input_textbox=mode_ui_names[opts.mode][2],
                           default_context_size=default_backend_info['context_size'],
                           stats_json=json.dumps(stats, indent=4, ensure_ascii=False),
                           extra_info=mode_info,
                           openai_client_api=f'https://{base_client_api}/openai/v1' if opts.enable_openi_compatible_backend else 'disabled',
                           expose_openai_system_prompt=opts.expose_openai_system_prompt,
                           enable_streaming=opts.enable_streaming,
                           model_choices=model_choices,
                           proompters_5_min=stats['stats']['proompters']['5_min'],
                           proompters_24_hrs=stats['stats']['proompters']['24_hrs'],
                           )


@app.route('/<first>')
@app.route('/<first>/<path:rest>')
def fallback(first=None, rest=None):
    return jsonify({
        'code': 404,
        'msg': 'not found'
    }), 404


@app.errorhandler(500)
def server_error(e):
    return handle_server_error(e)


@app.before_request
def before_app_request():
    auto_set_base_client_api(request)


if __name__ == "__main__":
    server_startup(None)
    print('FLASK MODE - Startup complete!')
    app.run(host='0.0.0.0', threaded=False, processes=15)