add player package with key client-side player functionality, update protocol codecs, and refactor metadata definitions and slot usage

pkg/game/inventory/inventory.go

@@ -0,0 +1,96 @@
+package inventory
+
+import (
+	"context"
+
+	"git.konjactw.dev/patyhank/minego/pkg/bot"
+	"git.konjactw.dev/patyhank/minego/pkg/protocol/packet/game/server"
+	"git.konjactw.dev/patyhank/minego/pkg/protocol/slot"
+	"github.com/Tnze/go-mc/level/item"
+)
+
+// Container 代表一個容器
+type Container struct {
+	containerID int32
+	slots       []slot.Slot
+	c           bot.Client
+}
+
+func NewContainer(c bot.Client, cID int32) *Container {
+	return &Container{
+		c:           c,
+		containerID: cID,
+		slots:       make([]slot.Slot, 0),
+	}
+}
+
+func NewContainerWithSize(c bot.Client, cID, size int32) *Container {
+	return &Container{
+		c:           c,
+		containerID: cID,
+		slots:       make([]slot.Slot, size),
+	}
+}
+
+func (c *Container) GetSlot(index int) slot.Slot {
+	if index < 0 || index >= len(c.slots) {
+		return slot.Slot{}
+	}
+	return c.slots[index]
+}
+
+func (c *Container) Slots() []slot.Slot {
+	return c.slots
+}
+
+func (c *Container) SlotCount() int {
+	return len(c.slots)
+}
+
+func (c *Container) FindEmpty() int16 {
+	for i, s := range c.slots {
+		if s.Count <= 0 {
+			return int16(i)
+		}
+	}
+	return -1
+}
+
+func (c *Container) FindItem(itemID item.ID) int16 {
+	for i, s := range c.slots {
+		if s.ItemID == itemID && s.Count > 0 {
+			return int16(i)
+		}
+	}
+	return -1
+}
+
+func (c *Container) SetSlot(index int, s slot.Slot) {
+	// 自動擴容
+	for len(c.slots) <= index {
+		c.slots = append(c.slots, slot.Slot{})
+	}
+	if index >= 0 && index < len(c.slots) {
+		c.slots[index] = s
+	}
+}
+
+func (c *Container) SetSlots(slots []slot.Slot) {
+	c.slots = make([]slot.Slot, len(slots))
+	copy(c.slots, slots)
+}
+
+func (c *Container) Clear() {
+	c.slots = make([]slot.Slot, 0)
+}
+
+func (c *Container) Click(idx int16, mode int32, button int32) error {
+	clickPacket := &server.ContainerClick{
+		WindowID: c.containerID,
+		StateID:  c.c.Player().StateID(),
+		Slot:     idx,
+		Button:   int8(button),
+		Mode:     mode,
+	}
+	return c.c.WritePacket(context.Background(), clickPacket)
+}