from typing import Any, Dict
from flask import Flask, json, request
from dataclasses import dataclass
from flask_cors import CORS, cross_origin

@dataclass
class Score:
	score: int
	username: str
	ip: str | None = None

@dataclass()
class ScoreDTO:
	score: int
	username: str

app = Flask(__name__)
cors = CORS(app)
scores: list[Score] = []

@app.route('/')
def root():
	return 'This is the snakes backend for the leaderboard and should only be requested by the snakes webapp'

@app.route('/score', methods = ['GET'])
@cross_origin()
def get_score() -> str:
    scoreDTOs: list[ScoreDTO] = list(map(lambda score: ScoreDTO(score.score, score.username), scores))
    scoreDTOs.sort(reverse = True, key = lambda score: score.score)
    return json.dumps(scoreDTOs)


@app.route('/score', methods = ['POST'])
@cross_origin()
def add_score() -> str:
	body: Any | None = request.json

	if body is None:
		return json.dumps({'status': 'error', 'msg': 'could not parse passed json'})

	score: Score = Score(**body)

	ip = request.remote_addr

	if ip is None:
		return json.dumps({'status': 'error', "msg": 'not allowed. Ip of sender required'})

	score.ip = ip
	allready_saved_score = find_score_by(score.username)
	print(allready_saved_score)

	if allready_saved_score is None:
		scores.append(score)
		writeScores()
		return json.dumps({'status': 'success', 'msg': 'created score'})

	if allready_saved_score.ip == score.ip:

		if score.score > allready_saved_score.score:
			allready_saved_score.score = score.score
			writeScores()
			return json.dumps({'status': 'success', 'msg': 'updated score'})
		else:
			return json.dumps({'status': 'success', 'msg': 'score is not better. no update'})
	else:
		return json.dumps({'status': 'error', 'msg': 'score has been achieved on different machine'})


def json_body():
	return request.json


def writeScores():
    f = open('scores.json', 'w')
    f.write(json.dumps(scores))


def find_score_by(username: str) -> Score | None:
	for score in scores:
		if score.username == username:
			return score

	return None

def main():
	f = open('scores.json', 'r')
	scoresDictionary: list[Dict[str, Any]] = json.loads(f.read())

	for scoreObject in scoresDictionary:
		scores.append(Score(**scoreObject))

	app.run(debug = True)

if __name__ == "__main__":
    main()