Added inventory resource

inventory.go

@@ -0,0 +1,73 @@
+package bigcommerce
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+type InventoryResource struct {
+	Inventories []Inventory `json:"data"`
+	Meta        Meta        `json:"meta"`
+}
+
+type Identity struct {
+	Sku       string `json:"sku"`
+	VariantID int    `json:"variant_id"`
+	ProductID int    `json:"product_id"`
+}
+type Settings struct {
+	SafetyStock      int    `json:"safety_stock"`
+	IsInStock        bool   `json:"is_in_stock"`
+	WarningLevel     int    `json:"warning_level"`
+	BinPickingNumber string `json:"bin_picking_number"`
+}
+type Inventory struct {
+	Identity             Identity `json:"identity"`
+	AvailableToSell      int      `json:"available_to_sell"`
+	TotalInventoryOnhand int      `json:"total_inventory_onhand"`
+	Settings             Settings `json:"settings"`
+}
+
+type Links struct {
+	Previous string `json:"previous"`
+	Current  string `json:"current"`
+	Next     string `json:"next"`
+}
+
+type Meta struct {
+	Pagination Pagination `json:"pagination"`
+}
+
+func (bc *Client) GetInventoryForLocation(ID int64, filters map[string]string) (*InventoryResource, error) {
+	var params []string
+	for k, v := range filters {
+		params = append(params, fmt.Sprintf("%s=%s", k, v))
+	}
+
+	url := fmt.Sprintf("/v3/inventory/locations/%d/items", ID) + strings.Join(params, "&")
+
+	req := bc.getAPIRequest(http.MethodGet, url, nil)
+	res, err := bc.HTTPClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	defer res.Body.Close()
+	body, err := processBody(res)
+	if err != nil {
+		if res.StatusCode == http.StatusNoContent {
+			return &InventoryResource{}, nil
+		}
+		return nil, err
+	}
+
+	var resource InventoryResource
+	err = json.Unmarshal(body, &resource)
+
+	if err != nil {
+		return nil, err
+	}
+	return &resource, nil
+}