import json
import os
import sys
from pathlib import Path
from threading import Thread

from flask import Flask, jsonify, render_template, request

import config
from llm_server import opts
from llm_server.config import ConfigLoader, config_default_vars, config_required_vars, mode_ui_names
from llm_server.database import get_number_of_rows, init_db
from llm_server.helpers import resolve_path
from llm_server.llm.hf_textgen.info import hf_textget_info
from llm_server.routes.cache import cache, redis
from llm_server.routes.queue import start_workers
from llm_server.routes.stats import SemaphoreCheckerThread, process_avg_gen_time
from llm_server.routes.v1 import bp
from llm_server.routes.v1.generate_stats import generate_stats
from llm_server.stream import init_socketio
from llm_server.threads import MainBackgroundThread

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')

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

# Resolve relative directory to the directory of the script
if config['database_path'].startswith('./'):
    config['database_path'] = resolve_path(script_path, config['database_path'].strip('./'))

opts.database_path = resolve_path(config['database_path'])
init_db()

if config['mode'] not in ['oobabooga', 'hf-textgen', 'vllm']:
    print('Unknown mode:', config['mode'])
    sys.exit(1)
opts.mode = config['mode']
opts.auth_required = config['auth_required']
opts.log_prompts = config['log_prompts']
opts.concurrent_gens = config['concurrent_gens']
opts.frontend_api_client = config['frontend_api_client']
opts.context_size = config['token_limit']
opts.show_num_prompts = config['show_num_prompts']
opts.show_uptime = config['show_uptime']
opts.backend_url = config['backend_url'].strip('/')
opts.show_total_output_tokens = config['show_total_output_tokens']
opts.netdata_root = config['netdata_root']
opts.simultaneous_requests_per_ip = config['simultaneous_requests_per_ip']
opts.show_backend_info = config['show_backend_info']
opts.max_new_tokens = config['max_new_tokens']

opts.verify_ssl = config['verify_ssl']
if not opts.verify_ssl:
    import urllib3

    urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

flushed_keys = redis.flush()
print('Flushed', len(flushed_keys), 'keys from Redis.')

if config['load_num_prompts']:
    redis.set('proompts', get_number_of_rows('prompts'))

if config['average_generation_time_mode'] not in ['database', 'minute']:
    print('Invalid value for config item "average_generation_time_mode":', config['average_generation_time_mode'])
    sys.exit(1)
opts.average_generation_time_mode = config['average_generation_time_mode']

start_workers(opts.concurrent_gens)

# cleanup_thread = Thread(target=elapsed_times_cleanup)
# cleanup_thread.daemon = True
# cleanup_thread.start()
# Start the background thread
process_avg_gen_time_background_thread = Thread(target=process_avg_gen_time)
process_avg_gen_time_background_thread.daemon = True
process_avg_gen_time_background_thread.start()
MainBackgroundThread().start()
SemaphoreCheckerThread().start()

app = Flask(__name__)
cache.init_app(app)
cache.clear()  # clear redis cache
init_socketio(app)
# with app.app_context():
#     current_app.tokenizer = tiktoken.get_encoding("cl100k_base")
app.register_blueprint(bp, url_prefix='/api/v1/')


# print(app.url_map)


@app.route('/')
@app.route('/api')
@cache.cached(timeout=10, query_string=True)
def home():
    if not opts.base_client_api:
        opts.base_client_api = f'{request.headers.get("Host")}/{opts.frontend_api_client.strip("/")}'
    stats = generate_stats()

    if not bool(redis.get('backend_online')) or not stats['online']:
        running_model = estimated_wait_sec = 'offline'
    else:
        running_model = opts.running_model

        if stats['queue']['queued'] == 0 and stats['queue']['processing'] > 0:
            # There will be a wait if the queue is empty but prompts are processing, but we don't
            # know how long.
            estimated_wait_sec = f"less than {stats['stats']['average_generation_elapsed_sec']} seconds"
        else:
            estimated_wait_sec = f"{stats['queue']['estimated_wait_sec']} 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 = '<br>\n' + config['info_html']
    else:
        info_html = ''

    return render_template('home.html',
                           llm_middleware_name=config['llm_middleware_name'],
                           analytics_tracking_code=analytics_tracking_code,
                           info_html=info_html,
                           current_model=running_model,
                           client_api=stats['endpoints']['blocking'],
                           ws_client_api=stats['endpoints']['streaming'],
                           estimated_wait=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],
                           context_size=opts.context_size,
                           stats_json=json.dumps(stats, indent=4, ensure_ascii=False),
                           extra_info=hf_textget_info if opts.mode == 'hf-textgen' else '',
                           )


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


if __name__ == "__main__":
    app.run(host='0.0.0.0')