implementing storing chest data into Manager.Screens in bot/screen (#279)

bot/screen/chest.go

@@ -0,0 +1,39 @@
+package screen
+
+import (
+	"errors"
+
+	"github.com/Tnze/go-mc/chat"
+	"github.com/Tnze/go-mc/data/inventory"
+)
+
+type Chest struct {
+	Type  inventory.InventoryID
+	Title chat.Message
+	Slots []Slot
+	Rows  int
+}
+
+func (c *Chest) onSetSlot(i int, slot Slot) error {
+	if i < 0 || i >= len(c.Slots) {
+		return errors.New("slot index out of bounds")
+	}
+	c.Slots[i] = slot
+	return nil
+}
+
+func (c *Chest) onClose() error {
+	return nil
+}
+
+func (c *Chest) Container() []Slot {
+	return c.Slots[0 : c.Rows*9]
+}
+
+func (c *Chest) Main() []Slot {
+	return c.Slots[c.Rows*9 : c.Rows*9+27]
+}
+
+func (c *Chest) Hotbar() []Slot {
+	return c.Slots[c.Rows*9+27 : (c.Rows+4)*9]
+}