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// Copyright 2021 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::{BlsShareAuth, NodeAuth, ServiceAuth, SrcLocation};
use serde::{Deserialize, Serialize};

/// Source authority of a message.
///
/// Source of message and authority to send it. Authority is validated by the signature.
/// Messages do not need to sign this field as it is all verifiable (i.e. if the signature validates
/// against the public key and we know the public key then we are good. If the proof is not
/// recognised we can ask for a longer chain that can be recognised).
#[allow(clippy::large_enum_variant)]
#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)]
pub enum MsgKind {
    /// A data message, with the requesting peer's authority.
    ///
    /// Authority is needed to access private data, such as reading or writing a private file.
    ServiceMsg(ServiceAuth),

    /// A message from a Node with its own independent authority.
    ///
    /// Node authority is needed when nodes send messages directly to other nodes.
    // FIXME: is the above true? What does is the recieving node validating against?
    NodeAuthMsg(NodeAuth),

    /// A message from an Elder node with its share of the section authority.
    ///
    /// Section share authority is needed for messages related to section administration, such as
    /// DKG and relocation.
    NodeBlsShareAuthMsg(BlsShareAuth),
}

impl MsgKind {
    /// The priority of the message, when handled by lower level comms.
    pub fn priority(&self) -> i32 {
        match self {
            Self::NodeBlsShareAuthMsg(_) => 1,
            Self::NodeAuthMsg(_) => 0,
            Self::ServiceMsg(_) => -2,
        }
    }

    /// The src location of the msg.
    pub fn src(&self) -> SrcLocation {
        match self {
            Self::NodeBlsShareAuthMsg(auth) => SrcLocation::Node {
                name: auth.src_name,
                section_pk: auth.sig_share.public_key_set.public_key(),
            },
            Self::NodeAuthMsg(auth) => SrcLocation::Node {
                name: crate::types::PublicKey::Ed25519(auth.public_key).into(),
                section_pk: auth.section_pk,
            },
            Self::ServiceMsg(auth) => SrcLocation::EndUser(super::EndUser(auth.public_key.into())),
        }
    }
}