check_numberdealers/parse_numberdealers.py

#!/usr/bin/env python3

import re
import json
from dataclasses import dataclass
from typing import Optional, List


@dataclass
class Message:
	id: str
	username: Optional[str]
	message: Optional[str]
	first_filename: Optional[str]
	create_at: int
	recognized_number: Optional[int]

@dataclass
class NumberdealersError:
	message: Message
	previous_message: Message
	expected_number: Optional[int]
class UnrecognizedNumber(NumberdealersError): pass
class EditedMessage(NumberdealersError): pass
class NonNumberMessage(NumberdealersError): pass
class ShouldHaveBeen(NumberdealersError): pass
class Duplicate(NumberdealersError): pass
class Stray(NumberdealersError): pass
class Skipped(NumberdealersError): pass
class Jump(NumberdealersError): pass


try:
	USERS = __import__("users").users()
except ImportError:
	USERS = None

NUMBER_EMOJI = {
	"zero": "0",
	"one": "1",
	"two": "2",
	"three": "3",
	"four": "4",
	"five": "5",
	"six": "6",
	"seven": "7",
	"eight": "8",
	"nine": "9",
}

URL_PREFIX = "https://mattermost.zeus.gent/zeus/pl/"

def parse(message_json_lines):
	second_last_number = None
	second_last_message = None
	last_number = None
	last_message = None
	numbers = []
	errors = []
	start_number = None
	for line in message_json_lines:
		line = json.loads(line)
		# Ignore non-message posts (e.g. join/leave)
		if line.get("type") is not None:
			continue

		username = None
		if "user_id" in line and USERS is not None and line["user_id"] in USERS:
			username = USERS[line["user_id"]].get("username")
		if username is None:
			username = line.get("username")

		try:
			first_filename = line["metadata"]["files"][0]["name"]
		except (KeyError, IndexError):
			first_filename = None

		message_obj = Message(
			id=line["id"],
			username=username,
			message=line.get("message"),
			first_filename=first_filename,
			create_at=line["create_at"],
			recognized_number=None
		)
		message = None

		if "message" in line and line["message"] != "":
			message = line["message"]
			message = re.sub(r"^[#>]* ?|[*_`]*", "", message)
			for emoji, numb in NUMBER_EMOJI.items():
				message = re.sub(f" *:{emoji}: *", numb, message)
			message = re.sub(" ?:(?:green)?num([0-9]+): ?", lambda m: m.group(1), message)
			message = message.replace("\ufe0f", "").replace("\u20e3", "").replace("\u200b", "")
			message = message.strip()
		elif first_filename is not None:
			message = first_filename.split(".")[0]
		else:
			errors.append(
				UnrecognizedNumber(
					message_obj, last_message, last_number+1 if last_number is not None else None
				)
			)
			continue

		if line.get("edit_at") is not None:
				errors.append(
					EditedMessage(message_obj, last_message, last_number+1 if last_number is not None else None)
				)

		m = re.fullmatch(r"-?[1-9][0-9]*|0", message)
		if not m:
			errors.append(
				NonNumberMessage(message_obj, last_message, last_number+1 if last_number is not None else None)
			)
		else:
			number = int(m.group(0))
			message_obj.recognized_number = number
			if last_number is None:
				start_number = number
				last_number = number - 1
				second_last_number = number - 2

			numbers.append(message_obj)
			if number != last_number + 1:
				if number == second_last_number + 2 and last_number != second_last_number + 1:
					errors.pop()
					errors.append(
						ShouldHaveBeen(last_message, second_last_message, number-1)
					)
				elif number == last_number:
					errors.append(
						Duplicate(message_obj, last_message, last_number+1)
					)
				elif number == second_last_number + 1 and last_number != second_last_number + 1:
					errors.pop()
					errors.append(
						Stray(last_message, second_last_message, last_number+1)
					)
				elif last_number == second_last_number + 1 and number == last_number + 2:
					errors.pop()
					errors.append(
						Skipped(last_message, second_last_message, number-1)
					)
				else:
					errors.append(
						Jump(message_obj, last_message, last_number+1)
					)

			second_last_number = last_number
			second_last_message = last_message
			last_number = number
			last_message = message_obj

	return numbers, errors


def main():
	import sys
	from datetime import datetime, timezone

	numbers, _errors = parse(sys.stdin)
	for number in numbers:
		moment = datetime.fromtimestamp(number.create_at / 1000, timezone.utc)
		moment_str = str(moment).replace("+00:00", "")
		print(f"{moment_str}\t{number.username}\t{number.recognized_number}")

if __name__ == "__main__":
	main()