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

pkg/bot/handler.go

@@ -0,0 +1,24 @@
+package bot
+
+import (
+	"context"
+
+	"git.konjactw.dev/patyhank/minego/pkg/protocol/packet/game/client"
+	"github.com/Tnze/go-mc/data/packetid"
+)
+
+type PacketHandler interface {
+	AddPacketHandler(id packetid.ClientboundPacketID, handler func(ctx context.Context, p client.ClientboundPacket))
+	AddGenericPacketHandler(handler func(ctx context.Context, p client.ClientboundPacket))
+	HandlePacket(ctx context.Context, p client.ClientboundPacket)
+}
+
+type HandlerFunc[T client.ClientboundPacket] func(ctx context.Context, p T)
+
+func AddHandler[T client.ClientboundPacket](c Client, f HandlerFunc[T]) {
+	var t T
+	handler := c.PacketHandler()
+	handler.AddPacketHandler(t.PacketID(), func(ctx context.Context, p client.ClientboundPacket) {
+		f(ctx, p.(T))
+	})
+}