feat: add redis cache to store polls state

model/poll.py

@@ -0,0 +1,65 @@
+from typing import Dict, List
+
+class Poll:
+
+    OPTION_EMOJIS = ["1️⃣", "2️⃣", "3️⃣", "4️⃣", "5️⃣"]
+    BAR_CHAR = "█"
+    BAR_LENGTH = 20
+
+    def __init__(self, message_id: int, question: str, options: List[str], votes: Dict = None):
+        self.message_id = message_id
+        self.question = question
+        self.options = options 
+        self.votes = {option: [] for option in options} if not votes else votes
+
+    def get_vote_count(self, option: str) -> int:
+        if option not in self.options:
+            return 0 
+        return len(self.votes[option])
+
+    def get_total_vote_count(self) -> int:
+        return sum([self.get_vote_count(option) for option in self.options])
+
+    def get_vote_percentage(self, option: str) -> float:
+        vote_count = self.get_vote_count(option)
+
+        # avoid divide by zero
+        return 0 if self.get_total_vote_count() == 0 else vote_count / self.get_total_vote_count()
+
+    def add_vote(self, user_id: str, emoji: str) -> None:
+        option = self._get_option(emoji)
+
+        # only add vote if user has not already voted
+        if user_id not in self.votes[option]:
+            self.votes[option].append(user_id)
+        
+        print(self.votes) # TODO: remove
+
+    def remove_vote(self, user_id: str, emoji: str) -> None:
+        option = self._get_option(emoji)
+
+        # only remove if user has voted
+        if user_id in self.votes[option]:
+            self.votes[option].remove(user_id)
+        
+        print(self.votes) # TODO: remove
+
+    def get_emoji(self, option: str) -> str:
+        return Poll.OPTION_EMOJIS[self.options.index(option)]
+
+    def _get_option(self, emoji: str) -> str:
+        # check if valid emoji
+        if emoji not in self.OPTION_EMOJIS:
+            return None
+
+        option_index = Poll.OPTION_EMOJIS.index(emoji)
+
+        # check if valid vote
+        if option_index >= len(self.options):
+            return None
+
+        return self.options[option_index]
+
+    @staticmethod
+    def create_from(poll_dict: Dict) -> "Poll":
+        return Poll(int(poll_dict["message_id"]), poll_dict["question"], poll_dict["options"], poll_dict["votes"])