syntax = "proto3";

package hipstershop;

// -----------------Cart service-----------------

service CartService {
    rpc AddItem(AddItemRequest) returns (Empty) {}
    rpc GetCart(GetCartRequest) returns (Cart) {}
    rpc EmptyCart(EmptyCartRequest) returns (Empty) {}
}

message CartItem {
    string product_id = 1;
    int32  quantity = 2;
}

message AddItemRequest {
    string user_id = 1;
    CartItem item = 2;
}

message EmptyCartRequest {
    string user_id = 1;
}

message GetCartRequest {
    string user_id = 1;
}

message Cart {
    string user_id = 1;
    repeated CartItem items = 2;
}

message Empty {}

// ---------------Recommendation service----------

service RecommendationService {
  rpc ListRecommendations(ListRecommendationsRequest) returns (ListRecommendationsResponse){}
}

message ListRecommendationsRequest {
    string user_id = 1;
    repeated string product_ids = 2;
}

message ListRecommendationsResponse {
    repeated string product_ids = 1;
}

// ---------------Product Catalog----------------

service ProductCatalogService {
    rpc ListProducts(Empty) returns (ListProductsResponse) {}
    rpc GetProduct(GetProductRequest) returns (Product) {}
    rpc SearchProducts(SearchProductsRequest) returns (SearchProductsResponse) {}
}

message Product {
    string id = 1;
    string name = 2;
    string description = 3;
    string picture = 4;
    MoneyAmount price_usd = 5;
}

message ListProductsResponse {
    repeated Product products = 1;
}

message GetProductRequest {
    string id = 1;
}

message SearchProductsRequest {
    string query = 1;
}

message SearchProductsResponse {
    repeated Product results = 1;
}

// ---------------Shipping Service----------

service ShippingService {
    rpc GetQuote(GetQuoteRequest) returns (GetQuoteResponse) {}
    rpc ShipOrder(ShipOrderRequest) returns (ShipOrderResponse) {}
}

message GetQuoteRequest {
    Address address = 1;
    repeated CartItem items = 2;
}

message GetQuoteResponse {
    MoneyAmount cost_usd = 1;
}

message ShipOrderRequest {
    Address address = 1;
    repeated CartItem items = 2;
}

message ShipOrderResponse {
    string tracking_id = 1;
}

message Address {
    string street_address_1 = 1;
    string street_address_2 = 2;
    string city= 3;
    string country = 4;
    int32 zip_code = 5;
}

// -----------------Currency service-----------------

service CurrencyService {
    rpc GetSupportedCurrencies(Empty) returns (GetSupportedCurrenciesResponse) {}
    rpc Convert(ConversionRequest) returns (ConversionResponse) {}
}


// Describes a money amount without currency. For example, decimal=2 and
// fractional=500 (or fractional=5) makes up 2.5 units.
message MoneyAmount {
    uint32 decimal = 1;
    uint32 fractional = 2;
}

message Money {
    // The 3-letter currency code defined in ISO 4217.
    string currency_code = 1;
    MoneyAmount amount = 2;
}

message GetSupportedCurrenciesResponse {
    // The 3-letter currency code defined in ISO 4217.
    repeated string currency_codes = 1;
}

message ConversionRequest {
    Money from = 1;

    // The 3-letter currency code defined in ISO 4217.
    string to_code = 2;
}

message ConversionResponse {
    Money result = 1;
}

// -------------Payment service-----------------

service PaymentService {
    rpc Charge(ChargeRequest) returns (ChargeResponse) {}
}

message CreditCardInfo {
    string credit_card_number = 1;
    int32 credit_card_cvv = 2;
    int32 credit_card_expiration_year = 3;
    int32 credit_card_expiration_month = 4;
}

message ChargeRequest {
    Money amount = 1;
    CreditCardInfo credit_card = 2;
}

message ChargeResponse {
    string transaction_id = 1;
}

// -------------Email service-----------------

service EmailService {
    rpc SendOrderConfirmation(SendOrderConfirmationRequest) returns (Empty) {}
}

message OrderItem {
    CartItem item = 1;
    Money cost = 2;
}

message OrderResult {
    string   order_id = 1;
    string   shipping_tracking_id = 2;
    Money shipping_cost = 3;
    Address  shipping_address = 4;
    repeated OrderItem items = 5;
}

message SendOrderConfirmationRequest {
    string email = 1;
    OrderResult order = 2;
}


// -------------Checkout service-----------------

service CheckoutService {
    rpc CreateOrder(CreateOrderRequest) returns (CreateOrderResponse) {}
    rpc PlaceOrder(PlaceOrderRequest) returns (PlaceOrderResponse) {}
}

message CreateOrderRequest {
    string user_id = 1;
    string user_currency = 2;
    Address address = 3;
}

message CreateOrderResponse {
    repeated OrderItem items = 1;
    Money shipping_cost = 2;
}

message PlaceOrderRequest {
    string user_id = 1;
    string user_currency = 2;

    Address address = 3;
    string email = 5;
    CreditCardInfo credit_card = 6;
}

message PlaceOrderResponse {
    OrderResult order = 1;
}