Implemented first pass of character and inventory services

services/inventory/inventory.go

@@ -3,28 +3,76 @@ package inventoryapi
 import (
 	"context"
 	inventory "crossnokaye-interview-assignment/services/inventory/gen/inventory"
+	"errors"
 	"log"
 )
 
 // inventory service example implementation.
 // The example methods log the requests and return zero values.
 type inventorysrvc struct {
-	logger *log.Logger
+	logger      *log.Logger
+	inventories map[int]*[]int //key = characterId, value = array of itemIds
 }
 
 // NewInventory returns the inventory service implementation.
 func NewInventory(logger *log.Logger) inventory.Service {
-	return &inventorysrvc{logger}
+	inventoryMap := make(map[int]*[]int)
+	return &inventorysrvc{logger, inventoryMap}
 }
 
 // AddItem implements addItem.
-func (s *inventorysrvc) AddItem(ctx context.Context, p int) (err error) {
+func (s *inventorysrvc) AddItem(ctx context.Context, p *inventory.InventoryRecord) (err error) {
 	s.logger.Print("inventory.addItem")
+
+	itemList := s.inventories[*p.CharacterID]
+	if itemList == nil {
+		itemList = s.initCharacterInventory(p.CharacterID)
+	}
+	newItemList := append(*itemList, *p.ItemID)
+	s.inventories[*p.CharacterID] = &newItemList
+
 	return
 }
 
 // RemoveItem implements removeItem.
-func (s *inventorysrvc) RemoveItem(ctx context.Context, p int) (err error) {
+func (s *inventorysrvc) RemoveItem(ctx context.Context, p *inventory.InventoryRecord) (err error) {
 	s.logger.Print("inventory.removeItem")
+
+	itemList := s.inventories[*p.CharacterID]
+	if itemList == nil {
+		s.logger.Printf("inventory for character with id %d not found", p.CharacterID)
+		return errors.New("item not found")
+	}
+
+	idx := indexOf(*p.ItemID, *itemList)
+	if idx != -1 {
+		newItemList := remove(*itemList, idx)
+		s.inventories[*p.CharacterID] = &newItemList
+	} else {
+		s.logger.Printf("character with id %d does not have item %d in inventory", &p.CharacterID, &p.ItemID)
+		return errors.New("item not found for character")
+	}
+
 	return
 }
+
+func (s *inventorysrvc) initCharacterInventory(characterId *int) (itemList *[]int) {
+	list := make([]int, 0)
+	itemList = &list
+	s.inventories[*characterId] = &list
+	return
+}
+
+func indexOf(element int, data []int) int {
+	for k, v := range data {
+		if element == v {
+			return k
+		}
+	}
+	return -1 //not found.
+}
+
+func remove(s []int, i int) []int {
+	s[i] = s[len(s)-1]
+	return s[:len(s)-1]
+}