"""
Auth API Router - Login, Logout, Me endpoints
"""
from fastapi import APIRouter, HTTPException, status, Request, Depends, Response
from pydantic import BaseModel
from typing import Optional
from app.core.auth_service import AuthService
from app.core.config import settings
from app.core.auth_dependencies import get_current_user
import logging

logger = logging.getLogger(__name__)

router = APIRouter()


class LoginRequest(BaseModel):
    username: str
    password: str
    otp_code: Optional[str] = None


class LoginResponse(BaseModel):
    access_token: str
    token_type: str = "bearer"
    user: dict
    requires_2fa_setup: bool = False


class LogoutRequest(BaseModel):
    token_jti: Optional[str] = None


class TwoFactorCodeRequest(BaseModel):
    otp_code: str


@router.post("/login", response_model=LoginResponse)
async def login(request: Request, credentials: LoginRequest, response: Response):
    """
    Authenticate user and return JWT token
    """
    ip_address = request.client.host if request.client else None
    
    # Authenticate user
    user, error_detail = AuthService.authenticate_user(
        username=credentials.username,
        password=credentials.password,
        ip_address=ip_address,
        otp_code=credentials.otp_code
    )

    if error_detail:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail=error_detail,
            headers={"WWW-Authenticate": "Bearer"},
        )

    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid username or password",
            headers={"WWW-Authenticate": "Bearer"},
        )
    
    # Create access token
    access_token = AuthService.create_access_token(
        user_id=user['user_id'],
        username=user['username'],
        is_superadmin=user['is_superadmin'],
        is_shadow_admin=user.get('is_shadow_admin', False)
    )

    requires_2fa_setup = (
        not user.get("is_shadow_admin", False)
        and not settings.AUTH_DISABLE_2FA
        and AuthService.is_2fa_supported()
        and not user.get("is_2fa_enabled", False)
    )
    
    response.set_cookie(
        key="access_token",
        value=access_token,
        httponly=True,
        samesite=settings.COOKIE_SAMESITE,
        secure=settings.COOKIE_SECURE
    )

    return LoginResponse(
        access_token=access_token,
        user=user,
        requires_2fa_setup=requires_2fa_setup
    )


@router.post("/logout")
async def logout(
    response: Response,
    current_user: dict = Depends(get_current_user),
    request: Optional[LogoutRequest] = None
):
    """
    Revoke JWT token (logout)
    """
    token_jti = request.token_jti if request and request.token_jti else current_user.get("token_jti")
    if token_jti:
        AuthService.revoke_token(
            token_jti,
            current_user['id'],
            current_user.get('is_shadow_admin', False)
        )
    
    response.delete_cookie("access_token")

    return {"message": "Successfully logged out"}


@router.get("/me")
async def get_me(current_user: dict = Depends(get_current_user)):
    """
    Get current authenticated user info
    """
    return {
        "id": current_user['id'],
        "username": current_user['username'],
        "email": current_user['email'],
        "full_name": current_user['full_name'],
        "is_superadmin": current_user['is_superadmin'],
        "is_2fa_enabled": current_user.get('is_2fa_enabled', False),
        "permissions": current_user['permissions']
    }


@router.post("/2fa/setup")
async def setup_2fa(current_user: dict = Depends(get_current_user)):
    """Generate and store TOTP secret (requires verification to enable)"""
    if current_user.get("is_shadow_admin"):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Shadow admin cannot configure 2FA",
        )

    try:
        result = AuthService.setup_user_2fa(
            user_id=current_user["id"],
            username=current_user["username"]
        )
    except RuntimeError as exc:
        if "2FA columns missing" in str(exc):
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail="2FA er ikke tilgaengelig i denne database (mangler kolonner).",
            )
        raise

    return result


@router.post("/2fa/enable")
async def enable_2fa(
    request: TwoFactorCodeRequest,
    current_user: dict = Depends(get_current_user)
):
    """Enable 2FA after verifying the provided code"""
    if current_user.get("is_shadow_admin"):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Shadow admin cannot configure 2FA",
        )

    ok = AuthService.enable_user_2fa(
        user_id=current_user["id"],
        otp_code=request.otp_code
    )

    if not ok:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Invalid 2FA code or missing setup",
        )

    return {"message": "2FA enabled"}


@router.post("/2fa/disable")
async def disable_2fa(
    request: TwoFactorCodeRequest,
    current_user: dict = Depends(get_current_user)
):
    """Disable 2FA after verifying the provided code"""
    if current_user.get("is_shadow_admin"):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Shadow admin cannot configure 2FA",
        )

    ok = AuthService.disable_user_2fa(
        user_id=current_user["id"],
        otp_code=request.otp_code
    )

    if not ok:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Invalid 2FA code or missing setup",
        )

    return {"message": "2FA disabled"}