from typing import List
from uuid import UUID

from auth.auth_bearer import AuthBearer, get_current_user
from fastapi import APIRouter, Depends, HTTPException
from models.brains import Brain
from models.brains_subscription_invitations import BrainSubscription
from models.users import User
from pydantic import BaseModel
from repository.brain.update_user_rights import update_brain_user_rights
from repository.brain_subscription.resend_invitation_email import (
    resend_invitation_email,
)
from repository.brain_subscription.subscription_invitation_service import (
    SubscriptionInvitationService,
)
from repository.user.get_user_email_by_user_id import get_user_email_by_user_id
from repository.user.get_user_id_by_user_email import get_user_id_by_user_email

from routes.authorizations.brain_authorization import (
    has_brain_authorization,
    validate_brain_authorization,
)
from routes.headers.get_origin_header import get_origin_header

subscription_router = APIRouter()
subscription_service = SubscriptionInvitationService()


@subscription_router.post(
    "/brains/{brain_id}/subscription",
    dependencies=[
        Depends(
            AuthBearer(),
        ),
        Depends(has_brain_authorization),
        Depends(get_origin_header),
    ],
    tags=["BrainSubscription"],
)
def invite_users_to_brain(
    brain_id: UUID,
    users: List[dict],
    origin: str = Depends(get_origin_header),
    current_user: User = Depends(get_current_user),
):
    """
    Invite multiple users to a brain by their emails. This function creates
    or updates a brain subscription invitation for each user and sends an
    invitation email to each user.
    """

    for user in users:
        subscription = BrainSubscription(
            brain_id=brain_id, email=user["email"], rights=user["rights"]
        )

        try:
            subscription_service.create_or_update_subscription_invitation(subscription)
            resend_invitation_email(
                subscription, inviter_email=current_user.email or "Quivr", origin=origin
            )
        except Exception as e:
            raise HTTPException(status_code=400, detail=f"Error inviting user: {e}")

    return {"message": "Invitations sent successfully"}


@subscription_router.get(
    "/brains/{brain_id}/users",
    dependencies=[Depends(AuthBearer()), Depends(has_brain_authorization())],
)
def get_brain_users(
    brain_id: UUID,
):
    """
    Get all users for a brain
    """
    brain = Brain(
        id=brain_id,
    )
    brain_users = brain.get_brain_users()

    brain_access_list = []

    for brain_user in brain_users:
        brain_access = {}
        # TODO: find a way to fetch user email concurrently
        brain_access["email"] = get_user_email_by_user_id(brain_user["user_id"])
        brain_access["rights"] = brain_user["rights"]
        brain_access_list.append(brain_access)

    return brain_access_list


@subscription_router.delete(
    "/brains/{brain_id}/subscription",
)
async def remove_user_subscription(
    brain_id: UUID, current_user: User = Depends(get_current_user)
):
    """
    Remove a user's subscription to a brain
    """
    brain = Brain(
        id=brain_id,
    )
    user_brain = brain.get_brain_for_user(current_user.id)
    if user_brain is None:
        raise HTTPException(
            status_code=403,
            detail="You don't have permission for this brain",
        )

    if user_brain.get("rights") != "Owner":
        brain.delete_user_from_brain(current_user.id)
    else:
        brain_users = brain.get_brain_users()
        brain_other_owners = [
            brain
            for brain in brain_users
            if brain["rights"] == "Owner"
            and str(brain["user_id"]) != str(current_user.id)
        ]

        if len(brain_other_owners) == 0:
            brain.delete_brain(current_user.id)
        else:
            brain.delete_user_from_brain(current_user.id)

    return {"message": f"Subscription removed successfully from brain {brain_id}"}


@subscription_router.get(
    "/brains/{brain_id}/subscription",
    dependencies=[Depends(AuthBearer())],
    tags=["BrainSubscription"],
)
def get_user_invitation(brain_id: UUID, current_user: User = Depends(get_current_user)):
    """
    Get an invitation to a brain for a user. This function checks if the user
    has been invited to the brain and returns the invitation status.
    """
    if not current_user.email:
        raise HTTPException(status_code=400, detail="User email is not defined")

    subscription = BrainSubscription(brain_id=brain_id, email=current_user.email)

    invitation = subscription_service.fetch_invitation(subscription)

    if invitation is None:
        raise HTTPException(
            status_code=404,
            detail="You have not been invited to this brain",
        )

    brain = Brain(id=brain_id)
    brain_details = brain.get_brain_details()

    if len(brain_details) == 0:
        raise HTTPException(
            status_code=404,
            detail="Brain not found while trying to get invitation",
        )

    return {"name": brain_details[0]["name"]}


@subscription_router.post(
    "/brains/{brain_id}/subscription/accept",
    tags=["Brain"],
)
async def accept_invitation(
    brain_id: UUID, current_user: User = Depends(get_current_user)
):
    """
    Accept an invitation to a brain for a user. This function removes the
    invitation from the subscription invitations and adds the user to the
    brain users.
    """
    if not current_user.email:
        raise HTTPException(status_code=400, detail="User email is not defined")

    subscription = BrainSubscription(brain_id=brain_id, email=current_user.email)

    try:
        invitation = subscription_service.fetch_invitation(subscription)
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Error fetching invitation: {e}")

    if not invitation:
        raise HTTPException(status_code=404, detail="Invitation not found")

    try:
        brain = Brain(id=brain_id)
        brain.create_brain_user(
            user_id=current_user.id, rights=invitation["rights"], default_brain=False
        )
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Error adding user to brain: {e}")

    try:
        subscription_service.remove_invitation(subscription)
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Error removing invitation: {e}")

    return {"message": "Invitation accepted successfully"}


@subscription_router.post(
    "/brains/{brain_id}/subscription/decline",
    tags=["Brain"],
)
async def decline_invitation(
    brain_id: UUID, current_user: User = Depends(get_current_user)
):
    """
    Decline an invitation to a brain for a user. This function removes the
    invitation from the subscription invitations.
    """
    if not current_user.email:
        raise HTTPException(status_code=400, detail="User email is not defined")

    subscription = BrainSubscription(brain_id=brain_id, email=current_user.email)

    try:
        invitation = subscription_service.fetch_invitation(subscription)
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Error fetching invitation: {e}")

    if not invitation:
        raise HTTPException(status_code=404, detail="Invitation not found")

    try:
        subscription_service.remove_invitation(subscription)
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Error removing invitation: {e}")

    return {"message": "Invitation declined successfully"}


class BrainSubscriptionUpdatableProperties(BaseModel):
    rights: str | None
    email: str


@subscription_router.put("/brains/{brain_id}/subscription")
def update_brain_subscription(
    brain_id: UUID,
    subscription: BrainSubscriptionUpdatableProperties,
    current_user: User = Depends(get_current_user),
):
    validate_brain_authorization(brain_id, current_user.id, "Owner")
    user_email = subscription.email

    if user_email == current_user.email:
        raise HTTPException(
            status_code=403,
            detail="You can't change your own permissions",
        )

    user_id = get_user_id_by_user_email(user_email)

    if subscription.rights is None:
        brain = Brain(
            id=brain_id,
        )
        brain.delete_user_from_brain(user_id)
    else:
        update_brain_user_rights(brain_id, user_id, subscription.rights)

    return {"message": "Brain subscription updated successfully"}