from typing import List, Literal
from uuid import uuid4
from pydantic import BaseModel
from src.security.rbac.rbac import authorization_verify_based_on_roles_and_authorship, authorization_verify_if_user_is_anon
from src.services.users.users import PublicUser
from fastapi import HTTPException, status, Request

#### Classes ####################################################


class Collection(BaseModel):
    name: str
    description: str
    courses: List[str]  # course_id
    public: bool
    org_id: str  # org_id


class CollectionInDB(Collection):
    collection_id: str
    authors: List[str]  # user_id


#### Classes ####################################################

####################################################
# CRUD
####################################################


async def get_collection(
    request: Request, collection_id: str, current_user: PublicUser
):
    collections = request.app.db["collections"]

    collection = await collections.find_one({"collection_id": collection_id})

    # verify collection rights
    await verify_collection_rights(
        request, collection_id, current_user, "read", collection["org_id"]
    )

    if not collection:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT, detail="Collection does not exist"
        )

    collection = Collection(**collection)

    # add courses to collection
    courses = request.app.db["courses"]
    courseids = [course for course in collection.courses]

    collection.courses = []
    collection.courses = courses.find({"course_id": {"$in": courseids}}, {"_id": 0})

    collection.courses = [
        course for course in await collection.courses.to_list(length=100)
    ]

    return collection


async def create_collection(
    request: Request, collection_object: Collection, current_user: PublicUser
):
    collections = request.app.db["collections"]

    # find if collection already exists using name
    isCollectionNameAvailable = await collections.find_one(
        {"name": collection_object.name}
    )

    # TODO
    # await verify_collection_rights("*", current_user, "create")

    if isCollectionNameAvailable:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Collection name already exists",
        )

    # generate collection_id with uuid4
    collection_id = str(f"collection_{uuid4()}")

    collection = CollectionInDB(
        collection_id=collection_id,
        authors=[current_user.user_id],
        **collection_object.dict(),
    )

    collection_in_db = await collections.insert_one(collection.dict())

    if not collection_in_db:
        raise HTTPException(
            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
            detail="Unavailable database",
        )

    return collection.dict()


async def update_collection(
    request: Request,
    collection_object: Collection,
    collection_id: str,
    current_user: PublicUser,
):
    # verify collection rights

    collections = request.app.db["collections"]

    collection = await collections.find_one({"collection_id": collection_id})

    await verify_collection_rights(
        request, collection_id, current_user, "update", collection["org_id"]
    )

    if not collection:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT, detail="Collection does not exist"
        )

    updated_collection = CollectionInDB(
        collection_id=collection_id, **collection_object.dict()
    )

    await collections.update_one(
        {"collection_id": collection_id}, {"$set": updated_collection.dict()}
    )

    return Collection(**updated_collection.dict())


async def delete_collection(
    request: Request, collection_id: str, current_user: PublicUser
):
    collections = request.app.db["collections"]

    collection = await collections.find_one({"collection_id": collection_id})

    await verify_collection_rights(
        request, collection_id, current_user, "delete", collection["org_id"]
    )

    if not collection:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT, detail="Collection does not exist"
        )

    isDeleted = await collections.delete_one({"collection_id": collection_id})

    if isDeleted:
        return {"detail": "collection deleted"}
    else:
        raise HTTPException(
            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
            detail="Unavailable database",
        )


####################################################
# Misc
####################################################


async def get_collections(
    request: Request,
    org_id: str,
    current_user: PublicUser,
    page: int = 1,
    limit: int = 10,
):
    collections = request.app.db["collections"]


    if current_user.user_id == "anonymous":
        all_collections = collections.find(
            {"org_id": org_id, "public": True}, {"_id": 0}
        )
    else:
        # get all collections from database without ObjectId
        all_collections = (
            collections.find({"org_id": org_id})
            .sort("name", 1)
            .skip(10 * (page - 1))
            .limit(limit)
        )

    # create list of collections and include courses in each collection
    collections_list = []
    for collection in await all_collections.to_list(length=100):
        collection = CollectionInDB(**collection)
        collections_list.append(collection)

        collection_courses = [course for course in collection.courses]
        # add courses to collection
        courses = request.app.db["courses"]
        collection.courses = []
        collection.courses = courses.find(
            {"course_id": {"$in": collection_courses}}, {"_id": 0}
        )

        collection.courses = [
            course for course in await collection.courses.to_list(length=100)
        ]

    return collections_list


#### Security ####################################################


async def verify_collection_rights(
    request: Request,
    collection_id: str,
    current_user: PublicUser,
    action: Literal["create", "read", "update", "delete"],
    org_id: str,
):
    collections = request.app.db["collections"]
    users = request.app.db["users"]
    user = await users.find_one({"user_id": current_user.user_id})
    collection = await collections.find_one({"collection_id": collection_id})

    if not collection and action != "create" and collection_id != "*":
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT, detail="Collection does not exist"
        )

    # Collections are public by default for now
    if current_user.user_id == "anonymous" and action == "read":
        return True

    await authorization_verify_if_user_is_anon(current_user.user_id)

    await authorization_verify_based_on_roles_and_authorship(
        request, current_user.user_id, action, user["roles"], collection_id
    )


#### Security ####################################################