#!/usr/bin/env python
#
# Copyright (C) 2021 GNS3 Technologies Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""
API routes for roles.
"""

import logging
from typing import List, Optional
from uuid import UUID

from fastapi import APIRouter, Depends, status

import gns3server.db.models as models
from gns3server import schemas
from gns3server.controller.controller_error import (
    ControllerBadRequestError,
    ControllerError,
    ControllerForbiddenError,
    ControllerNotFoundError,
)
from gns3server.db.repositories.rbac import RbacRepository

from .dependencies.database import get_repository
from .dependencies.rbac import has_privilege

log = logging.getLogger(__name__)

router = APIRouter()


@router.get("", response_model=List[schemas.Role], dependencies=[Depends(has_privilege("Role.Audit"))])
async def get_roles(rbac_repo: RbacRepository = Depends(get_repository(RbacRepository))) -> List[models.Role]:
    """
    Get all roles.

    Required privilege: Role.Audit
    """

    return await rbac_repo.get_roles()


@router.post(
    "",
    response_model=schemas.Role,
    status_code=status.HTTP_201_CREATED,
    dependencies=[Depends(has_privilege("Role.Allocate"))],
)
async def create_role(
    role_create: schemas.RoleCreate, rbac_repo: RbacRepository = Depends(get_repository(RbacRepository))
) -> Optional[models.Role]:
    """
    Create a new role.

    Required privilege: Role.Allocate
    """

    if await rbac_repo.get_role_by_name(role_create.name):
        raise ControllerBadRequestError(f"Role '{role_create.name}' already exists")

    return await rbac_repo.create_role(role_create)


@router.get("/{role_id}", response_model=schemas.Role, dependencies=[Depends(has_privilege("Role.Audit"))])
async def get_role(
    role_id: UUID,
    rbac_repo: RbacRepository = Depends(get_repository(RbacRepository)),
) -> models.Role:
    """
    Get a role.

    Required privilege: Role.Audit
    """

    role = await rbac_repo.get_role(role_id)
    if not role:
        raise ControllerNotFoundError(f"Role '{role_id}' not found")
    return role


@router.put("/{role_id}", response_model=schemas.Role, dependencies=[Depends(has_privilege("Role.Modify"))])
async def update_role(
    role_id: UUID, role_update: schemas.RoleUpdate, rbac_repo: RbacRepository = Depends(get_repository(RbacRepository))
) -> Optional[models.Role]:
    """
    Update a role.

    Required privilege: Role.Modify
    """

    role = await rbac_repo.get_role(role_id)
    if not role:
        raise ControllerNotFoundError(f"Role '{role_id}' not found")

    if role.is_builtin:
        raise ControllerForbiddenError(f"Built-in role '{role_id}' cannot be updated")

    return await rbac_repo.update_role(role_id, role_update)


@router.delete(
    "/{role_id}", status_code=status.HTTP_204_NO_CONTENT, dependencies=[Depends(has_privilege("Role.Allocate"))]
)
async def delete_role(
    role_id: UUID,
    rbac_repo: RbacRepository = Depends(get_repository(RbacRepository)),
) -> None:
    """
    Delete a role.

    Required privilege: Role.Allocate
    """

    role = await rbac_repo.get_role(role_id)
    if not role:
        raise ControllerNotFoundError(f"Role '{role_id}' not found")

    if role.is_builtin:
        raise ControllerForbiddenError(f"Built-in role '{role_id}' cannot be deleted")

    success = await rbac_repo.delete_role(role_id)
    if not success:
        raise ControllerError(f"Role '{role_id}' could not be deleted")
    await rbac_repo.delete_all_ace_starting_with_path(f"/roles/{role_id}")


@router.get(
    "/{role_id}/privileges", response_model=List[schemas.Privilege], dependencies=[Depends(has_privilege("Role.Audit"))]
)
async def get_role_privileges(
    role_id: UUID, rbac_repo: RbacRepository = Depends(get_repository(RbacRepository))
) -> List[models.Privilege]:
    """
    Get all role privileges.

    Required privilege: Role.Audit
    """

    return await rbac_repo.get_role_privileges(role_id)


@router.put(
    "/{role_id}/privileges/{privilege_id}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(has_privilege("Role.Modify"))],
)
async def add_privilege_to_role(
    role_id: UUID, privilege_id: UUID, rbac_repo: RbacRepository = Depends(get_repository(RbacRepository))
) -> None:
    """
    Add a privilege to a role.

    Required privilege: Role.Modify
    """

    privilege = await rbac_repo.get_privilege(privilege_id)
    if not privilege:
        raise ControllerNotFoundError(f"Privilege '{privilege_id}' not found")

    role = await rbac_repo.add_privilege_to_role(role_id, privilege)
    if not role:
        raise ControllerNotFoundError(f"Role '{role_id}' not found")


@router.delete(
    "/{role_id}/privileges/{privilege_id}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(has_privilege("Role.Modify"))],
)
async def remove_privilege_from_role(
    role_id: UUID,
    privilege_id: UUID,
    rbac_repo: RbacRepository = Depends(get_repository(RbacRepository)),
) -> None:
    """
    Remove privilege from a role.

    Required privilege: Role.Modify
    """

    privilege = await rbac_repo.get_privilege(privilege_id)
    if not privilege:
        raise ControllerNotFoundError(f"Privilege '{privilege_id}' not found")

    role = await rbac_repo.remove_privilege_from_role(role_id, privilege)
    if not role:
        raise ControllerNotFoundError(f"Role '{role_id}' not found")