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// Copyright 2018 MaidSafe.net limited.
//
// This SAFE Network Software is licensed to you under The General Public License (GPL), version 3.
// Unless required by applicable law or agreed to in writing, the SAFE Network Software distributed
// under the GPL Licence is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. Please review the Licences for the specific language governing
// permissions and limitations relating to use of the SAFE Network Software.

use super::{containers_from_repr_c, containers_into_vec, AppExchangeInfo, ContainerPermissions};
use crate::ffi::ipc::req as ffi;
use crate::ipc::errors::IpcError;
use ffi_utils::{vec_into_raw_parts, ReprC, StringError};
use safe_nd::AppPermissions;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;

/// Represents an authorisation request.
#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)]
pub struct AuthReq {
    /// The application identifier for this request
    pub app: AppExchangeInfo,
    /// `true` if the app wants dedicated container for itself. `false` otherwise.
    pub app_container: bool,
    /// Stores app permissions, e.g. allowing to work with the user's coin balance.
    pub app_permissions: AppPermissions,
    /// The list of containers the app wishes to access (and desired permissions).
    pub containers: HashMap<String, ContainerPermissions>,
}

impl AuthReq {
    /// Construct FFI wrapper for the native Rust object, consuming self.
    pub fn into_repr_c(self) -> Result<ffi::AuthReq, IpcError> {
        let Self {
            app,
            app_container,
            app_permissions,
            containers,
        } = self;

        let containers = containers_into_vec(containers).map_err(StringError::from)?;
        let (containers_ptr, containers_len) = vec_into_raw_parts(containers);

        Ok(ffi::AuthReq {
            app: app.into_repr_c()?,
            app_container,
            app_permission_transfer_coins: app_permissions.transfer_coins,
            app_permission_perform_mutations: app_permissions.perform_mutations,
            app_permission_get_balance: app_permissions.get_balance,
            containers: containers_ptr,
            containers_len,
        })
    }
}

impl ReprC for AuthReq {
    type C = *const ffi::AuthReq;
    type Error = IpcError;

    /// Constructs the object from the FFI counterpart.
    ///
    /// After calling this function, the subobjects memory is owned by the resulting object.
    unsafe fn clone_from_repr_c(repr_c: Self::C) -> Result<Self, Self::Error> {
        Ok(Self {
            app: AppExchangeInfo::clone_from_repr_c(&(*repr_c).app)?,
            app_container: (*repr_c).app_container,
            app_permissions: AppPermissions {
                transfer_coins: (*repr_c).app_permission_transfer_coins,
                perform_mutations: (*repr_c).app_permission_perform_mutations,
                get_balance: (*repr_c).app_permission_get_balance,
            },
            containers: containers_from_repr_c((*repr_c).containers, (*repr_c).containers_len)?,
        })
    }
}