/**
 * Service for working with CRDT tree.
 */
syntax = "proto3";

package tree;

import "pkg/services/tree/types.proto";

option go_package = "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/tree";

service TreeService {
  /* Client API */

  // Client methods are mapped to the object RPC:
  //  [ Add, AddByPath, Remove, Move ] -> PUT;
  //  [ GetNodeByPath, GetSubTree ] -> GET.
  //  One of the following must be true:
  //  - a signer passes non-extended basic ACL;
  //  - a signer passes extended basic ACL AND bearer token is
  //    attached AND the basic ACL allows attaching bearer token
  //    to the GET/PUT operation AND eACL table in the bearer contains
  //    an explicit allowing the signer's key (or its role) rule
  //    for the GET/PUT operation;
  //  - a signer passes extended basic ACL AND the extension
  //    contains an explicit allowing the signer's key (or its role)
  //    rule for GET/PUT operation.
  //  Otherwise, a request is denied.

  // Add adds new node to the tree. Invoked by a client.
  rpc Add (AddRequest) returns (AddResponse);
  // AddByPath adds new node to the tree by path. Invoked by a client.
  rpc AddByPath (AddByPathRequest) returns (AddByPathResponse);
  // Remove removes node from the tree. Invoked by a client.
  rpc Remove (RemoveRequest) returns (RemoveResponse);
  // Move moves node from one parent to another. Invoked by a client.
  rpc Move (MoveRequest) returns (MoveResponse);
  // GetNodeByPath returns list of IDs corresponding to a specific filepath.
  rpc GetNodeByPath (GetNodeByPathRequest) returns (GetNodeByPathResponse);
  // GetSubTree returns tree corresponding to a specific node.
  rpc GetSubTree (GetSubTreeRequest) returns (stream GetSubTreeResponse);
  // TreeList return list of the existing trees in the container.
  rpc TreeList (TreeListRequest) returns (TreeListResponse);

  /* Synchronization API */

  // Apply pushes log operation from another node to the current.
  // The request must be signed by a container node.
  rpc Apply (ApplyRequest) returns (ApplyResponse);
  // GetOpLog returns a stream of logged operations starting from some height.
  rpc GetOpLog(GetOpLogRequest) returns (stream GetOpLogResponse);
  // Healthcheck is a dummy rpc to check service availability
  rpc Healthcheck(HealthcheckRequest) returns (HealthcheckResponse);
}

message AddRequest {
  message Body {
    // Container ID in V2 format.
    bytes container_id = 1;
    // The name of the tree.
    string tree_id = 2;
    // ID of the parent to attach node to.
    uint64 parent_id = 3;
    // Key-Value pairs with meta information.
    repeated KeyValue meta = 4;
    // Bearer token in V2 format.
    bytes bearer_token = 5;
  }

  // Request body.
  Body body = 1;
  // Request signature.
  Signature signature = 2;
}

message AddResponse {
  message Body {
    // ID of the created node.
    uint64 node_id = 1;
  }

  // Response body.
  Body body = 1;
  // Response signature.
  Signature signature = 2;
};


message AddByPathRequest {
  message Body {
    // Container ID in V2 format.
    bytes container_id = 1;
    // The name of the tree.
    string tree_id = 2;
    // Attribute to build path with. Default: "FileName".
    string path_attribute = 3;
    // List of path components.
    repeated string path = 4;
    // Node meta-information.
    repeated KeyValue meta = 5;
    // Bearer token in V2 format.
    bytes bearer_token = 6;
  }

  // Request body.
  Body body = 1;
  // Request signature.
  Signature signature = 2;
}

message AddByPathResponse {
  message Body {
    // List of all created nodes. The first one is the leaf.
    repeated uint64 nodes = 1;
    // ID of the parent node where new nodes were attached.
    uint64 parent_id = 2;
  }

  // Response body.
  Body body = 1;
  // Response signature.
  Signature signature = 2;
};


message RemoveRequest {
  message Body {
    // Container ID in V2 format.
    bytes container_id = 1;
    // The name of the tree.
    string tree_id = 2;
    // ID of the node to remove.
    uint64 node_id = 3;
    // Bearer token in V2 format.
    bytes bearer_token = 4;
  }

  // Request body.
  Body body = 1;
  // Request signature.
  Signature signature = 2;
}

message RemoveResponse {
  message Body {
  }

  // Response body.
  Body body = 1;
  // Response signature.
  Signature signature = 2;
};


message MoveRequest {
  message Body {
    // TODO import neo.fs.v2.refs.ContainerID directly.
    // Container ID in V2 format.
    bytes container_id = 1;
    // The name of the tree.
    string tree_id = 2;
    // ID of the new parent.
    uint64 parent_id = 3;
    // ID of the node to move.
    uint64 node_id = 4;
    // Node meta-information.
    repeated KeyValue meta = 5;
    // Bearer token in V2 format.
    bytes bearer_token = 6;
  }

  // Request body.
  Body body = 1;
  // Request signature.
  Signature signature = 2;
}

message MoveResponse {
  message Body {
  }

  // Response body.
  Body body = 1;
  // Response signature.
  Signature signature = 2;
};


message GetNodeByPathRequest {
  message Body {
    // Container ID in V2 format.
    bytes container_id = 1;
    // The name of the tree.
    string tree_id = 2;
    // Attribute to build path with. Default: "FileName".
    string path_attribute = 3;
    // List of path components.
    repeated string path = 4;
    // List of attributes to include in response.
    repeated string attributes = 5;
    // Flag to return only the latest version of node.
    bool latest_only = 6;
    // Flag to return all stored attributes.
    bool all_attributes = 7;
    // Bearer token in V2 format.
    bytes bearer_token = 8;
  }

  // Request body.
  Body body = 1;
  // Request signature.
  Signature signature = 2;
}

message GetNodeByPathResponse {
  // Information about a single tree node.
  message Info {
    // Node ID.
    uint64 node_id = 1;
    // Timestamp of the last operation with the node.
    uint64 timestamp = 2;
    // Node meta-information.
    repeated KeyValue meta = 3;
    // Parent ID.
    uint64 parent_id = 4;
  }
  message Body {
    // List of nodes stored by path.
    repeated Info nodes = 1;
  }

  // Response body.
  Body body = 1;
  // Response signature.
  Signature signature = 2;
};


message GetSubTreeRequest {
  message Body {
    message Order {
      enum Direction {
        None = 0;
        Asc = 1;
      }
      Direction direction = 1;
    }
    // Container ID in V2 format.
    bytes container_id = 1;
    // The name of the tree.
    string tree_id = 2;
    // ID of the root node of a subtree.
    uint64 root_id = 3;
    // Optional depth of the traversal. Zero means return only root.
    // Maximum depth is 10.
    uint32 depth = 4;
    // Bearer token in V2 format.
    bytes bearer_token = 5;
    // Result ordering.
    Order order_by = 6;
  }

  // Request body.
  Body body = 1;
  // Request signature.
  Signature signature = 2;
}

message GetSubTreeResponse {
  message Body {
    // ID of the node.
    uint64 node_id = 1;
    // ID of the parent.
    uint64 parent_id = 2;
    // Time node was first added to a tree.
    uint64 timestamp = 3;
    // Node meta-information.
    repeated KeyValue meta = 4;
  }

  // Response body.
  Body body = 1;
  // Response signature.
  Signature signature = 2;
};

message TreeListRequest {
  message Body {
    // Container ID in V2 format.
    bytes container_id = 1;
  }

  // Request body.
  Body body = 1;
  // Request signature.
  Signature signature = 2;
}

message TreeListResponse {
  message Body {
    // Tree IDs.
    repeated string ids = 1;
  }

  // Response body.
  Body body = 1;
  Signature signature = 2;
}


message ApplyRequest {
  message Body {
    // Container ID in V2 format.
    bytes container_id = 1;
    // The name of the tree.
    string tree_id = 2;
    // Operation to be applied.
    LogMove operation = 3;
  }

  // Request body.
  Body body = 1;
  // Request signature.
  Signature signature = 2;
}

message ApplyResponse {
  message Body {
  }

  // Response body.
  Body body = 1;
  // Response signature.
  Signature signature = 2;
};


message GetOpLogRequest {
  message Body {
    // Container ID in V2 format.
    bytes container_id = 1;
    // The name of the tree.
    string tree_id = 2;
    // Starting height to return logs from.
    uint64 height = 3;
    // Amount of operations to return.
    uint64 count = 4;
  }

  // Request body.
  Body body = 1;
  // Request signature.
  Signature signature = 2;
}

message GetOpLogResponse {
  message Body {
    // Operation on a tree.
    LogMove operation = 1;
  }

  // Response body.
  Body body = 1;
  // Response signature.
  Signature signature = 2;
};

message HealthcheckResponse {
  message Body {
  }

  // Response body.
  Body body = 1;
  // Response signature.
  Signature signature = 2;
};

message HealthcheckRequest {
  message Body {
  }

  // Request body.
  Body body = 1;
  // Request signature.
  Signature signature = 2;
}