import logging
import traceback
import signal
import sys

from flask import Flask
from flask_cors import CORS
from flask_restful import Api

import lib.api.util.CONFIG as CONFIG
import lib.api.util.LogWrapper as LogWrapper
from lib.api.endpoints.VectorStoreAPI import VectorStoreAPI
from lib.api.endpoints.MappingAPI import MappingAPI

lv_logger = logging.getLogger(__name__)

def fn_signal_handler(sig, frame):
    print('Flask server shutting down...')
    sys.exit(0)

def start_rest_app():
    LogWrapper.fn_start_logging()

    try:
        lv_app = Flask(__name__)
        CORS(lv_app)
        lv_api = Api(lv_app)
        
        # Service to Create Vector Store
        lv_api.add_resource(
                            VectorStoreAPI, 
                            '/api/create/vectordb'
                           )
        
        # Service to Map Source to Target
        lv_api.add_resource(
                            MappingAPI, 
                            '/api/create/mapping'
                           )

        signal.signal(signal.SIGTERM, fn_signal_handler)
        signal.signal(signal.SIGINT, fn_signal_handler)
        lv_app.run( 
                    use_reloader=True,
                    host='0.0.0.0',
                    port=int(CONFIG.SERVER_PORT),
                    debug=True
                  )
        lv_logger.info("Running FlaskServer")
    except Exception as e:
        lv_logger.error(e)
        lv_logger.error(traceback.format_exc())
        lv_logger.error("Unable to start FlaskServer")
        return None