[golang] implement trading and contracting

1 files changed, 51 insertions, 2 deletions

diff --git a/golang/pkg/api/contracts.go b/golang/pkg/api/contracts.go
index 573d938..6a9a28a 100644
--- a/golang/pkg/api/contracts.go
+++ b/golang/pkg/api/contracts.go
@@ -20,16 +20,65 @@ func (c *Client) Accept(contract *model.Contract, db *database.DB) error {
 	}
 	var response acceptResponse
 	if err := c.Send("POST", &uriRef, nil, &response); err != nil {
-		return fmt.Errorf("failed to accept contract %s: %w", contract.Id, err)
+		return fmt.Errorf("failed API request: %w", err)
 	}
 	if err := db.SaveAgent(response.Agent); err != nil {
-		return fmt.Errorf("failed to accept contract %s: %w", contract.Id, err)
+		return fmt.Errorf("failed to save agent: %w", err)
 	}
 	contract.Accepted = response.Contract.Accepted
 	contract.Terms = response.Contract.Terms
 	return nil
 }
 
+func (c *Client) Deliver(contract *model.Contract, ship *model.Ship, db *database.DB) error {
+	deliver := contract.Terms.Deliver[0]
+	var units int
+	for _, cargoItem := range ship.Cargo.Inventory {
+		if cargoItem.Symbol == deliver.TradeSymbol {
+			units = min(deliver.UnitsRequired-deliver.UnitsFulfilled, cargoItem.Units)
+			break
+		}
+	}
+	uriRef := url.URL{Path: path.Join("my/contracts", contract.Id, "deliver")}
+	type deliverRequest struct {
+		ShipSymbol  string `json:"shipSymbol"`
+		TradeSymbol string `json:"tradeSymbol"`
+		Units       int    `json:"units"`
+	}
+	type deliverResponse struct {
+		Cargo    *model.Cargo    `json:"cargo"`
+		Contract *model.Contract `json:"contract"`
+	}
+	var response deliverResponse
+	if err := c.Send("POST", &uriRef, deliverRequest{ship.Symbol, deliver.TradeSymbol, units}, &response); err != nil {
+		return fmt.Errorf("failed API request: %w", err)
+	}
+	ship.Cargo = response.Cargo
+	contract.Terms = response.Contract.Terms
+	return nil
+}
+
+func (c *Client) Fulfill(contract *model.Contract, db *database.DB) error {
+	if contract.Fulfilled {
+		return nil
+	}
+	uriRef := url.URL{Path: path.Join("my/contracts", contract.Id, "fulfill")}
+	type fulfillResponse struct {
+		Agent    *model.Agent    `json:"agent"`
+		Contract *model.Contract `json:"contract"`
+	}
+	var response fulfillResponse
+	if err := c.Send("POST", &uriRef, nil, &response); err != nil {
+		return fmt.Errorf("failed API request: %w", err)
+	}
+	if err := db.SaveAgent(response.Agent); err != nil {
+		return fmt.Errorf("failed to save agent: %w", err)
+	}
+	contract.Fulfilled = response.Contract.Fulfilled
+	contract.Terms = response.Contract.Terms
+	return nil
+}
+
 func (c *Client) MyContracts() ([]model.Contract, error) {
 	uriRef := url.URL{Path: "my/contracts"}
 	var contracts []model.Contract