import os
import boto3
import requests
import jwt
from fastapi import Depends, HTTPException, status, Request
from fastapi.security import OAuth2AuthorizationCodeBearer
from fastapi.security.utils import get_authorization_scheme_param
from fastapi.responses import RedirectResponse

REGION = "us-east-2"
USER_POOL_ID = os.getenv("COGNITO_USER_POOL_ID")
CLIENT_ID = os.getenv("COGNITO_CLIENT_ID")
DOMAIN = f"https://iptv-updater.auth.{REGION}.amazoncognito.com"

class BrowserAwareOAuth2(OAuth2AuthorizationCodeBearer):
    async def __call__(self, request: Request) -> str:
        # Check if this is a browser request
        is_browser = "text/html" in request.headers.get("accept", "")
        
        # Try to get token from cookie first, then header
        authorization = request.cookies.get("token")
        if not authorization:
            authorization = request.headers.get("Authorization")
        
        scheme, param = get_authorization_scheme_param(authorization)
        
        if not authorization or scheme.lower() != "bearer":
            if is_browser:
                redirect_uri = str(request.base_url) + "auth/callback"
                # Return redirect for browser requests
                return RedirectResponse(
                    f"{DOMAIN}/login?client_id={CLIENT_ID}"
                    f"&response_type=code"
                    f"&scope=openid+email+profile"
                    f"&redirect_uri={redirect_uri}",
                    status_code=302
                )
            # Return 401 for API requests
            raise HTTPException(
                status_code=401,
                detail="Not authenticated",
                headers={"WWW-Authenticate": "Bearer"},
            )
                
        return param

# Update the oauth2_scheme to use our custom class
oauth2_scheme = BrowserAwareOAuth2(
    authorizationUrl=f"{DOMAIN}/oauth2/authorize",
    tokenUrl=f"{DOMAIN}/oauth2/token"
)

def exchange_code_for_token(code: str, redirect_uri: str):
    token_url = f"{DOMAIN}/oauth2/token"
    data = {
        'grant_type': 'authorization_code',
        'client_id': CLIENT_ID,
        'code': code,
        'redirect_uri': redirect_uri
    }
    
    response = requests.post(token_url, data=data)
    if response.status_code == 200:
        return response.json()
    print(f"Token exchange failed: {response.text}")
    raise HTTPException(status_code=400, detail="Failed to exchange code for token")

async def get_current_user(request: Request, token: str = Depends(oauth2_scheme)):
    if not token:
        redirect_uri = str(request.base_url) + "auth/callback"
        return RedirectResponse(
            f"{DOMAIN}/login?client_id={CLIENT_ID}"
            f"&response_type=code"
            f"&scope=openid+email+profile"
            f"&redirect_uri={redirect_uri}"
        )
    
    try:
        decoded = jwt.decode(
            token,
            options={"verify_signature": False}
        )
        return {
            "Username": decoded.get("email") or decoded.get("sub"),
            "UserAttributes": [
                {"Name": k, "Value": v}
                for k, v in decoded.items()
            ]
        }
    except Exception as e:
        print(f"Token verification failed: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid authentication credentials",
            headers={"WWW-Authenticate": "Bearer"},
        )