import time
import datetime
import requests
from flask import current_app

class WebexManager:
    def __init__(self, db_collection, client_id, client_secret, redirect_uri, team_id, user_id):
        self.db = db_collection
        self.client_id = client_id
        self.client_secret = client_secret
        self.redirect_uri = redirect_uri
        self.team_id = team_id
        self.user_id = user_id
        self.base_url = "https://webexapis.com/v1"

    def save_tokens(self, token_data: dict):
        """Saves or updates Webex OAuth tokens in MongoDB."""
        now = time.time()
        doc = {
            "_id": "webex_credentials",
            "access_token": token_data.get("access_token"),
            "refresh_token": token_data.get("refresh_token"),
            "expires_at": now + token_data.get("expires_in", 43200) - 300, # Subtract 5 mins buffer
            "refresh_token_expires_at": now + token_data.get("refresh_token_expires_in", 7776000),
            "updated_at": datetime.datetime.now(datetime.timezone.utc).isoformat()
        }
        self.db.replace_one({"_id": "webex_credentials"}, doc, upsert=True)
        return doc

    def get_access_token(self) -> str:
        """Retrieves a valid access token from MongoDB, auto-refreshing if expired."""
        token_doc = self.db.find_one({"_id": "webex_credentials"})
        if not token_doc:
            raise Exception("No Webex OAuth tokens found. Please complete login at /oauth/login.")

        # Check if access token is expired
        if time.time() >= token_doc.get("expires_at", 0):
            current_app.logger.info("Webex access token expired. Refreshing...")
            return self.refresh_token(token_doc.get("refresh_token"))

        return token_doc.get("access_token")

    def exchange_code(self, code: str) -> dict:
        """Exchanges OAuth code for access and refresh tokens."""
        payload = {
            "grant_type": "authorization_code",
            "client_id": self.client_id,
            "client_secret": self.client_secret,
            "code": code,
            "redirect_uri": self.redirect_uri
        }
        res = requests.post(f"{self.base_url}/access_token", data=payload)
        res.raise_for_status()
        return self.save_tokens(res.json())

    def refresh_token(self, refresh_token: str) -> str:
        """Refreshes the Webex access token using the stored refresh_token."""
        payload = {
            "grant_type": "refresh_token",
            "client_id": self.client_id,
            "client_secret": self.client_secret,
            "refresh_token": refresh_token
        }
        res = requests.post(f"{self.base_url}/access_token", data=payload)
        res.raise_for_status()
        new_doc = self.save_tokens(res.json())
        return new_doc["access_token"]

    def create_support_room(self, client_name: str, client_email: str) -> str:
        """Creates a team support room and invites the client and yourself."""
        access_token = self.get_access_token()
        headers = {
            "Authorization": f"Bearer {access_token}",
            "Content-Type": "application/json"
        }

        # 1. Create room under team
        room_res = requests.post(
            f"{self.base_url}/rooms",
            headers=headers,
            json={
                "title": f"Smartwave Support: {client_name}",
                "teamId": self.team_id
            }
        )
        room_res.raise_for_status()
        room_id = room_res.json()["id"]

        # 2. Add Client via email (Webex sends invite if user does not exist)
        if client_email:
            requests.post(
                f"{self.base_url}/memberships",
                headers=headers,
                json={"roomId": room_id, "personEmail": client_email}
            )

        # 3. Add yourself (WEBEX_NINLUC_ID)
        if self.user_id:
            requests.post(
                f"{self.base_url}/memberships",
                headers=headers,
                json={"roomId": room_id, "personId": self.user_id}
            )

        # 4. Optional: Send initial welcome message in the room
        requests.post(
            f"{self.base_url}/messages",
            headers=headers,
            json={
                "roomId": room_id,
                "text": f"Support room initialized for {client_name}. An agent will be with you shortly."
            }
        )

        return room_id