syntax = "proto2";

package topotext;

// Apple's topotext CRDT protocol, as extracted from iCloud Reminders main.js.
// This is the wire format used for TitleDocument in CloudKit.

message String {
    optional string string = 2;

    // Only needed for mergeable strings.
    repeated Substring substring = 3;
    optional VectorTimestamp timestamp = 4;

    repeated AttributeRun attributeRun = 5;

    // Optional attachment data.
    repeated Attachment attachment = 6;
}

message VectorTimestamp {
    message Clock {
        optional bytes replicaUUID = 1;
        message ReplicaClock {
            optional uint32 clock = 1;
            optional uint32 subclock = 2;
        }
        repeated ReplicaClock replicaClock = 2;
    }
    repeated Clock clock = 1;
}

message CharID {
    optional uint32 replicaID = 1;
    optional uint32 clock = 2;
}

message Substring {
    optional CharID charID = 1;
    // Length of substring in UTF-16 characters.
    optional uint32 length = 2;

    // Style timestamp.
    optional CharID timestamp = 3;

    optional bool tombstone = 4;

    // Index into String.substring.
    repeated uint32 child = 5;
}

message Selection {
    message Range {
        optional CharID fromChar = 1;
        optional CharID toChar = 2;
    };
    repeated bytes replicaUUID = 1;
    repeated Range range = 2;

    enum Affinity {
        Backward = 0;
        Forward = 1;
    }
    optional Affinity affinity = 3;
}

message AttributeRun {
    // Length of run in UTF-16 characters.
    optional uint32 length = 1;

    optional ParagraphStyle paragraphStyle = 2;

    // Overrides bold, italic and paragraph styles.
    optional Font font = 3;

    // Modifiers applied on-top of paragraph style (bold, italic...).
    optional uint32 fontHints = 5;

    optional uint32 underline = 6;
    optional uint32 strikethrough = 7;

    optional int32 superscript = 8;
    optional string link = 9;
    optional Color color = 10;

    enum WritingDirection {
        NaturalDirection = 0;
        LeftToRight = 1;
        RightToLeft = 2;
        LeftToRightOverride = 3;
        RightToLeftOverride = 4;
    }

    optional WritingDirection writingDirection = 11;

    optional AttachmentInfo attachmentInfo = 12;

    optional uint64 timestamp = 13;

    // Reminders hashtags
    optional HashtagInfo hashtagInfo = 14;
}

message Font {
    optional string name = 1;
    optional float pointSize = 2;
    optional uint32 fontHints = 3;
}

message ParagraphStyle {
    enum Alignment {
        Left = 0;
        Center = 1;
        Right = 2;
        Justified = 3;
        Natural = 4;
    }

    optional uint32 style = 1;
    optional Alignment alignment = 2;
    optional AttributeRun.WritingDirection writingDirection = 3;
    optional int32 indent = 4;
    optional Todo todo = 5;
    optional uint32 paragraphHints = 6;
    optional uint32 startingListItemNumber = 7;
    optional uint32 blockQuoteLevel = 8;
}

message HashtagInfo {
    optional string objectIdentifier = 1;
}

message AttachmentInfo {
    optional string attachmentIdentifier = 1;
    optional string typeUTI = 2;
}

message Attachment {
    optional string identifier = 2;
    optional bytes mergeableData = 3;
    optional float sizeHeight = 4;
    optional float sizeWidth = 5;
    optional string summary = 6;
    optional string title = 7;
    optional string typeUTI = 8;
    optional string urlString = 9;
}

message Todo {
    optional bytes todoUUID = 1;
    optional bool done = 2;
}

message Color {
    optional float red = 1;
    optional float green = 2;
    optional float blue = 3;
    optional float alpha = 4;
}