syntax = "proto3";

message Metadata {
    // this format is versioned
    int32 version = 1;
    // complete command line used to write this message
    string cmdline = 2;
    // repository's name
    string repository = 3;
    // timestamp of the first analysed commit
    int64 begin_unix_time = 4;
    // timestamp of the last analysed commit
    int64 end_unix_time = 5;
    // how many days are in each band [burndown_project, burndown_file, burndown_developer]
    int32 granularity = 6;
    // how frequently we measure the state of each band [burndown_project, burndown_file, burndown_developer]
    int32 sampling = 7;
}

message BurndownSparseMatrixRow {
    // the first `len(column)` elements are stored,
    // the rest `number_of_columns - len(column)` values are zeros
    repeated uint32 columns = 1;
}

message BurndownSparseMatrix {
    string name = 1;
    int32 number_of_rows = 2;
    int32 number_of_columns = 3;
    // `len(row)` matches `number_of_rows`
    repeated BurndownSparseMatrixRow rows = 4;
}

message CompressedSparseRowMatrix {
    int32 number_of_rows = 1;
    int32 number_of_columns = 2;
    // https://en.wikipedia.org/wiki/Sparse_matrix#Compressed_sparse_row_.28CSR.2C_CRS_or_Yale_format.29
    repeated int64 data = 3;
    repeated int32 indices = 4;
    repeated int64 indptr = 5;
}

message Couples {
    // name of each `matrix`'s row and column
    repeated string index = 1;
    // is always square
    CompressedSparseRowMatrix matrix = 2;
}

message TouchedFiles {
    repeated int32 files = 1;  // values correspond to `file_couples::index`
}

message DeveloperTouchedFiles {
    // order corresponds to `developer_couples::index`
    repeated TouchedFiles developers = 1;
}

message AnalysisResults {
    // these two are always included
    Metadata header = 1;
    BurndownSparseMatrix burndown_project = 2;

    // this is included if `-files` was specified
    repeated BurndownSparseMatrix burndown_files = 3;

    // these two are included if `-people` was specified
    repeated BurndownSparseMatrix burndown_developers = 4;
    // rows and cols order correspond to `burndown_developer`
    CompressedSparseRowMatrix developers_interaction = 5;

    // these three are included if `-couples` was specified
    Couples file_couples = 6;
    Couples developer_couples = 7;
    DeveloperTouchedFiles touched_files = 8;
}