syntax = "proto3";

package backend_proto;

message Empty {}

message BackendInput {
    oneof value {
        PlusOneIn plus_one = 2;
        TemplateRequirementsIn template_requirements = 3;
    }
}

message BackendOutput {
    oneof value {
        BackendError error = 1;
        PlusOneOut plus_one = 2;
        TemplateRequirementsOut template_requirements = 3;
    }
}

message BackendError {
    oneof value {
        InvalidInputError invalid_input = 1;
        TemplateParseError template_parse = 2;
    }
}

message InvalidInputError {
    string info = 1;
}

message PlusOneIn {
    int32 num = 1;
}

message PlusOneOut {
    int32 num = 1;
}

message TemplateParseError {
    string info = 1;
}

message TemplateRequirementsIn {
    repeated string template_front = 1;
    map<string, uint32> field_names_to_ordinals = 2;
}

message TemplateRequirementsOut {
    repeated TemplateRequirement requirements = 1;
}

message TemplateRequirement {
    oneof value {
        TemplateRequirementAll all = 1;
        TemplateRequirementAny any = 2;
        Empty none = 3;
    }
}

message TemplateRequirementAll {
    repeated uint32 ords = 1;
}

message TemplateRequirementAny {
    repeated uint32 ords = 1;
}