"""
Business logic reusable functions related to IAM

Exports:
 - service_key_dependency: bool: verifies request headers contain the correct api key for the service
"""

from typing import Annotated
from datetime import datetime, timedelta, timezone

from src.service.models import Service
from src.database import db_dependency
from src.exceptions import UnauthorizedException
from src.utils import send_email, generate_jwt

from src.iam.schemas import IAMCAoRRequest
from src.iam.models import Group


from fastapi import Request, Depends


def valid_service_key(
	db: db_dependency, request: Request, request_model: IAMCAoRRequest
) -> bool:
	rn = request_model.rn
	api_key = request.headers.get("X-API-Key", None)
	if not api_key:
		raise UnauthorizedException("Missing API key")
	service = rn.service
	result = (
		db.query(Service)
		.filter(Service.name == service)
		.filter(Service.api_key == api_key)
		.first()
	)
	if result is None:
		raise UnauthorizedException("Invalid API key")

	return True


service_key_dependency = Annotated[bool, Depends(valid_service_key)]


async def send_user_group_invitation(
	user_email: str, org_name: str, org_id: int, group_id: int, group_name: str
):
	expiry_delta = timedelta(hours=24)
	expiry = datetime.now(timezone.utc) + expiry_delta
	claims = {
		"email": user_email,
		"org_id": org_id,
		"group_id": group_id,
		"group_name": group_name,
		"exp": expiry,
		"type": "group_invite",
	}

	token = await generate_jwt(claims)
	subject = f"You have been invited to join a group of {org_name}"
	body = f"You have been invited to join {group_name}.\nClick the link to accept.\nfrontend.capture/send/to/endpoint/{token}"

	await send_email(
		recipient=user_email,
		subject=subject,
		body=body,
	)


async def create_default_user_group(db: db_dependency, org_model):
	new_group = Group(name="Default Users", org_id=org_model.id)
	db.add(new_group)
	db.flush()
	# Grant default permissions here
	db.flush()
	return new_group


async def assign_default_user_group(db: db_dependency, org_model, user_model):
	group_model = None
	for group in org_model.group_rel:
		if group.name == "Default Users":
			group_model = group
			break

	if group_model is None:
		group_model = await create_default_user_group(db=db, org_model=org_model)

	user_model.group_rel.append(group_model)
	db.flush()


async def create_default_root_group(db: db_dependency, org_model):
	new_group = Group(name="Root User", org_id=org_model.id)
	db.add(new_group)
	db.flush()
	# Grant default permissions here
	db.flush()
	return new_group


async def assign_default_root_group(db: db_dependency, org_model, user_model):
	group_model = None
	for group in org_model.group_rel:
		if group.name == "Root User":
			group_model = group
			break

	if group_model is None:
		group_model = await create_default_root_group(db=db, org_model=org_model)

	user_model.group_rel.append(group_model)
	db.flush()