syntax = "proto2";

//
// To compile:
// cd client_libraries/java
// protoc --proto_path=../../ --java_out=src/main/java ../../sparkplug_b.proto 
//
package com.cirruslink.sparkplug.protobuf;

option java_package         = "com.cirruslink.sparkplug.protobuf";
option java_outer_classname = "SparkplugBProto";

message Payload {
    /*
        // Indexes of Data Types

        // Unknown placeholder for future expansion.
        Unknown         = 0;

        // Basic Types
        Int8            = 1;
        Int16           = 2;
        Int32           = 3;
        Int64           = 4;
        UInt8           = 5;
        UInt16          = 6;
        UInt32          = 7;
        UInt64          = 8;
        Float           = 9;
        Double          = 10;
        Boolean         = 11;
        String          = 12;
        DateTime        = 13;
        Text            = 14;

        // Additional Metric Types
        UUID            = 15;
        DataSet         = 16;
        Bytes           = 17;
        File            = 18;
        Template        = 19;
        
        // Additional PropertyValue Types
        PropertySet     = 20;
        PropertySetList = 21;

    */

    message Template {
        
        message Parameter {
            optional string name        = 1;
            optional uint32 type        = 2;

            oneof value {
                uint32 int_value        = 3;
                uint64 long_value       = 4;
                float  float_value      = 5;
                double double_value     = 6;
                bool   boolean_value    = 7;
                string string_value     = 8;
                ParameterValueExtension extension_value = 9;
            }

            message ParameterValueExtension {
                extensions              1 to max;
            }
        }

        optional string version         = 1;          // The version of the Template to prevent mismatches
        repeated Metric metrics         = 2;          // Each metric is the name of the metric and the datatype of the member but does not contain a value
        repeated Parameter parameters   = 3;
        optional string template_ref    = 4;          // Reference to a template if this is extending a Template or an instance - must exist if an instance
        optional bool is_definition     = 5;
        extensions                      6 to max;
    }

    message DataSet {

        message DataSetValue {

            oneof value {
                uint32 int_value                        = 1;
                uint64 long_value                       = 2;
                float  float_value                      = 3;
                double double_value                     = 4;
                bool   boolean_value                    = 5;
                string string_value                     = 6;
                DataSetValueExtension extension_value   = 7;
            }

            message DataSetValueExtension {
                extensions  1 to max;
            }
        }

        message Row {
            repeated DataSetValue elements  = 1;
            extensions                      2 to max;   // For third party extensions
        }

        optional uint64   num_of_columns    = 1;
        repeated string   columns           = 2;
        repeated uint32   types             = 3;
        repeated Row      rows              = 4;
        extensions                          5 to max;   // For third party extensions
    }

    message PropertyValue {

        optional uint32     type                    = 1;
        optional bool       is_null                 = 2; 

        oneof value {
            uint32          int_value               = 3;
            uint64          long_value              = 4;
            float           float_value             = 5;
            double          double_value            = 6;
            bool            boolean_value           = 7;
            string          string_value            = 8;
            PropertySet     propertyset_value       = 9;
            PropertySetList propertysets_value      = 10;      // List of Property Values
            PropertyValueExtension extension_value  = 11;
        }

        message PropertyValueExtension {
            extensions                             1 to max;
        }
    }

    message PropertySet {
        repeated string        keys     = 1;         // Names of the properties
        repeated PropertyValue values   = 2;
        extensions                      3 to max;
    }

    message PropertySetList {
        repeated PropertySet propertyset = 1;
        extensions                       2 to max;
    }

    message MetaData {
        // Bytes specific metadata
        optional bool   is_multi_part   = 1;

        // General metadata
        optional string content_type    = 2;        // Content/Media type
        optional uint64 size            = 3;        // File size, String size, Multi-part size, etc
        optional uint64 seq             = 4;        // Sequence number for multi-part messages

        // File metadata
        optional string file_name       = 5;        // File name
        optional string file_type       = 6;        // File type (i.e. xml, json, txt, cpp, etc)
        optional string md5             = 7;        // md5 of data

        // Catchalls and future expansion
        optional string description     = 8;        // Could be anything such as json or xml of custom properties
        extensions                      9 to max;
    }

    message Metric {

        optional string   name          = 1;        // Metric name - should only be included on birth
        optional uint64   alias         = 2;        // Metric alias - tied to name on birth and included in all later DATA messages
        optional uint64   timestamp     = 3;        // Timestamp associated with data acquisition time
        optional uint32   datatype      = 4;        // DataType of the metric/tag value
        optional bool     is_historical = 5;        // If this is historical data and should not update real time tag
        optional bool     is_transient  = 6;        // Tells consuming clients such as MQTT Engine to not store this as a tag
        optional bool     is_null       = 7;        // If this is null - explicitly say so rather than using -1, false, etc for some datatypes.
        optional MetaData metadata      = 8;        // Metadata for the payload
        optional PropertySet properties = 9;

        oneof value {
            uint32   int_value                      = 10;
            uint64   long_value                     = 11;
            float    float_value                    = 12;
            double   double_value                   = 13;
            bool     boolean_value                  = 14;
            string   string_value                   = 15;
            bytes    bytes_value                    = 16;       // Bytes, File
            DataSet  dataset_value                  = 17;
            Template template_value                 = 18;
            MetricValueExtension extension_value    = 19;
        }

        message MetricValueExtension {
            extensions  1 to max;
        }
    }

    optional uint64   timestamp     = 1;        // Timestamp at message sending time
    repeated Metric   metrics       = 2;        // Repeated forever - no limit in Google Protobufs
    optional uint64   seq           = 3;        // Sequence number
    optional string   uuid          = 4;        // UUID to track message type in terms of schema definitions
    optional bytes    body          = 5;        // To optionally bypass the whole definition above
    extensions                      6 to max;   // For third party extensions
}