import os
from telethon import TelegramClient
from config import settings

class SessionManager:
    def __init__(self):
        self.client = TelegramClient(settings.SESSION_NAME, settings.API_ID, settings.API_HASH)
        self.is_connected = False

    def connect(self):
        """Connects to Telegram, handling session loading or new login."""
        print("Attempting to connect to Telegram...")
        try:
            # Attempt to start the client. If the session file exists, it loads.
            self.client.start()
            self.is_connected = True
            print("✅ Session connected successfully.")
            return True
        except FileNotFoundError:
            print("Session file not found. Starting new session login...")
            # First run: prompts for phone, code, and 2FA password
            self.client.start(phone=input("Enter your phone number (e.g., +1234567890): "), 
                              api_id=settings.API_ID, 
                              api_hash=settings.API_HASH)
            self.is_connected = True
            print("✅ Session established for the first time.")
            return True
        except Exception as e:
            print(f"❌ Connection Error: {e}")
            self.is_connected = False
            return False

    def disconnect(self):
        """Gracefully disconnects the client."""
        if self.is_connected:
            self.client.disconnect()
            self.is_connected = False
            print("🔌 Session disconnected.")

    def get_client(self):
        """Returns the active Telethon client."""
        if self.is_connected:
            return self.client
        else:
            print("⚠️ Session is not active. Reconnecting...")
            self.connect()
            return self.client
            
    def save_session(self):
        """Saves the active session state (optional, mainly for confirmation)."""
        if self.is_connected:
            self.client.disconnect()
            # In a real app, you might save client parameters, but Telethon handles session file saving automatically.
            print("Session explicitly disconnected and ready to be reconnected.")
            return True
        return False

    def delete_session(self):
        """Deletes the session file, forcing a fresh login next time."""
        if os.path.exists(settings.SESSION_FILE):
            os.remove(settings.SESSION_FILE)
            print(f"🗑️ Session file '{settings.SESSION_FILE}' deleted. Next run requires re-authentication.")
            return True
        print("Session file does not exist to delete.")
        return False