from flask import Flask, request, jsonify
from flask_restful import Resource, Api
import json
from gevent.pywsgi import WSGIServer
import gevent
from retrieval_index import RetrievalIndex

from utils import logger

app = Flask(__name__)
api = Api(app)

index = RetrievalIndex()

class BuildIndex(Resource):
    def post(self):
        request_body = json.loads(request.data)

        user_id = request_body['user_id']
        image_hashes = request_body['image_hashes']
        image_embeddings = request_body['image_embeddings']

        index.build_index_for_user(user_id,image_hashes,image_embeddings)

        return jsonify({'status':True,'index_size':index.indices[user_id].ntotal})

class SearchIndex(Resource):
    def post(self):
        try:
            request_body = json.loads(request.data)

            user_id = request_body['user_id']
            image_embedding = request_body['image_embedding']
            if 'n' in request_body.keys():
                n = int(request_body['n'])
            else:
                n = 100

            res = index.search_similar(user_id,image_embedding,n)

            return jsonify({'status':True,'result':res})
        except BaseException as e:
            logger.error(str(e))
            return jsonify({'status':False,'result':[]},status=500)

api.add_resource(BuildIndex,'/build/')
api.add_resource(SearchIndex,'/search/')
        
if __name__ == '__main__':
    logger.info('starting server')
    server = WSGIServer(('0.0.0.0', 8002), app)
    server_thread = gevent.spawn(server.serve_forever)
    gevent.joinall([server_thread])