package bookstore;
// The book store service definition.
service Bookstore {
  // Retrieve a book
  rpc GetBook(GetBookRequest) returns (GetBookResponse) {}
}

// The request with a id of the book
message GetBookRequest {
  string id = 1;
}
// The response details of a book
message GetBookResponse {
  string id = 1;
  string name = 2;
  string author = 3;
  int32 year = 4;
}

package rfkpos;

enum TransactionState {
    TRANS_OPEN = 0;
    TRANS_PAYED = 1;
    TRANS_REVOKED = 2;

enum Units {
    U_D = 0; // discrete
    U_G = 1; // gram
    U_M = 2; // metre
    U_L = 3; // litre
}
message Usage {
    double amount = 0;
    uint64 item = 1;
    optional string comment = 2;
}
message Product {
    string name = 0;
    Money price = 1; // default price to use
    Units units = 2;
    bool to_sell = 10;
    bool to_buy = 11;
    bool need_date_from = 12;
    bool need_date_to = 13;
    optional string comment = 40;
    repeated Usage usage = 50;
    repeated string tag = 51; // product is shown in different places depending on tag
    repeated uint64 invalidates = 90; // tid's of products to invalidate

enum TransactionType {
    TRANS_SELL = 0;
    TRANS_BUY = 1;

message TransactionEntry {
    uint64 product = 0;
    double amount = 1;
    Money price = 2;
    optional Money discount = 3;
    optional Timestamp valid_from = 4;
    optional Timestamp valid_to = 5;

    Timestamp ts = 2;
    TransactionType type = 3;
    Money discount = 4;
    Timestamp expire = 5;
    optional string comment = 6;

    Timestamp ts = 0;
    Timestamp valid_until = 2;
    optional uint64 customer = 1; // customer tid
    optional Money discount = 2;
    repeated TransactionEntry entry = 3;

message Transaction {
    uint64 id = 0;
    TransactionData data = 1;
    TransactionState state = 2;

message Invalidate {
    optional string comment = 0;
    repeated uint64 invalidate = 1; // tid of transaction to invalidate

message CommitTransactionRequest {
    TransactionData tr = 0;
    Signature signature = 1;

message SellTransaction {
    TransactionData data = 0;
    Invalidate invalidate = 1;

message CommitTransactionResponse {
    optional Created created = 0;
    optional Error err = 1;

message BuyTransaction {
    TransactionData data = 0;
    Invalidate invalidate = 1;
}
message RentTransaction {
    TransactionData data = 0;
    Invalidate invalidate = 1;

message Transaction {
    uint64 tid = 0;
    uint64 parent = 1;
    uint64 user = 2;
    uint64 ts = 3; // unix time in seconds
    string signature = 4;
    oneof transaction_type {
        SellTransaction sell = 10;
        BuyTransaction buy = 11;
        RentTransaction rent = 12;
        Invalidate invalidate = 13;
        Customer customer = 20;
        Product product = 21;
        Payment payment = 30;
        User user = 90;
    }
}
message Database {
    uint64 next_tid = 0;
    map<uint64, Transaction> transactions = 1;
}