// Copyright (C) 2018 Storj Labs, Inc.
// See LICENSE for copying information.

syntax = "proto3";
option go_package = "pb";

import "google/protobuf/duration.proto";

package overlay;

// NodeTransport is an enum of possible transports for the overlay network
enum NodeTransport {
    TCP_TLS_GRPC = 0;
}

// Overlay defines the interface for communication with the overlay network
service Overlay {
    // Lookup finds a nodes address from the network
    rpc Lookup(LookupRequest) returns (LookupResponse);
    // BulkLookup finds nodes addresses from the network
    rpc BulkLookup(LookupRequests) returns (LookupResponses);
    // FindStorageNodes finds a list of nodes in the network that meet the specified request parameters
    rpc FindStorageNodes(FindStorageNodesRequest) returns (FindStorageNodesResponse);
}

service Nodes {
    rpc Query(QueryRequest) returns (QueryResponse);
    rpc Ping(PingRequest) returns (PingResponse);
}

// LookupRequest is is request message for the lookup rpc call
message LookupRequest {
    string nodeID = 1;
}

// LookupResponse is is response message for the lookup rpc call
message LookupResponse {
    Node node = 1;
}

//LookupRequests is a list of LookupRequest
message LookupRequests {
    repeated LookupRequest lookuprequest = 1;
}

//LookupResponse is a list of LookupResponse
message LookupResponses {
    repeated LookupResponse lookupresponse = 1;
}


// FindStorageNodesResponse is is response message for the FindStorageNodes rpc call
message FindStorageNodesResponse {
    repeated Node nodes = 1;
}

// FindStorageNodesRequest is is request message for the FindStorageNodes rpc call
message FindStorageNodesRequest {
    int64 objectSize = 1;
    google.protobuf.Duration contractLength = 2;
    OverlayOptions opts = 3;
}

// NodeAddress contains the information needed to communicate with a node on the network
message NodeAddress {
    NodeTransport transport = 1;
    string address = 2;
}

// OverlayOptions is a set of criteria that a node must meet to be considered for a storage opportunity
message OverlayOptions {
    google.protobuf.Duration maxLatency = 1;
    NodeRep minReputation = 2;
    int64 minSpeedKbps = 3;
    int64 amount = 4;
    NodeRestrictions restrictions = 5;
    repeated string excluded_nodes = 6;
}

// NodeRep is the reputation characteristics of a node
message NodeRep {
    float minUptime = 1;
    float minAuditSuccess = 2;
    int64 minAuditCount = 3;
}

//  NodeRestrictions contains all relevant data about a nodes ability to store data
message NodeRestrictions {
    int64 freeBandwidth = 1;
    int64 freeDisk = 2;
}

// Node represents a node in the overlay network
message Node {
    string id = 1;
    NodeAddress address = 2;
    NodeType type = 3;
    NodeRestrictions restrictions = 4;
}

// NodeType is an enum of possible node types
enum NodeType {
    ADMIN = 0;
    STORAGE = 1;
}

message QueryRequest {
    overlay.Node sender = 1;
    overlay.Node target = 2;
    int64 limit = 3;
    bool pingback = 4;
}

message QueryResponse {
    overlay.Node sender = 1;

    repeated overlay.Node response = 2;
}

message PingRequest {};
message PingResponse {};

message Restriction {
    enum Operator {
        LT = 0;
        EQ = 1;
        GT = 2;
        LTE = 3;
        GTE = 4;
    }
    enum Operand {
        freeBandwidth = 0;
        freeDisk = 1;
    }

    Operator operator = 1;
    Operand operand = 2;
    int64 value = 3;
}