package legacypacket

import (
	"github.com/akmalfairuz/legacy-version/legacyver/proto"
	"github.com/sandertv/gophertunnel/minecraft/protocol"
	"github.com/sandertv/gophertunnel/minecraft/protocol/packet"
)

// InventoryTransaction is a packet sent by the client. It essentially exists out of multiple sub-packets,
// each of which have something to do with the inventory in one way or another. Some of these sub-packets
// directly relate to the inventory, others relate to interaction with the world, that could potentially
// result in a change in the inventory.
type InventoryTransaction struct {
	// LegacyRequestID is an ID that is only non-zero at times when sent by the client. The server should
	// always send 0 for this. When this field is not 0, the LegacySetItemSlots slice below will have values
	// in it.
	// LegacyRequestID ties in with the ItemStackResponse packet. If this field is non-0, the server should
	// respond with an ItemStackResponse packet. Some inventory actions such as dropping an item out of the
	// hotbar are still one using this packet, and the ItemStackResponse packet needs to tie in with it.
	LegacyRequestID int32
	// LegacySetItemSlots are only present if the LegacyRequestID is non-zero. These item slots inform the
	// server of the slots that were changed during the inventory transaction, and the server should send
	// back an ItemStackResponse packet with these slots present in it. (Or false with no slots, if rejected.)
	LegacySetItemSlots []protocol.LegacySetItemSlot
	// Actions is a list of actions that took place, that form the inventory transaction together. Each of
	// these actions hold one slot in which one item was changed to another. In general, the combination of
	// all of these actions results in a balanced inventory transaction. This should be checked to ensure that
	// no items are cheated into the inventory.
	Actions []protocol.InventoryAction
	// TransactionData is a data object that holds data specific to the type of transaction that the
	// TransactionPacket held. Its concrete type must be one of NormalTransactionData, MismatchTransactionData
	// UseItemTransactionData, UseItemOnEntityTransactionData or ReleaseItemTransactionData. If nil is set,
	// the transaction will be assumed to of type InventoryTransactionTypeNormal.
	TransactionData proto.InventoryTransactionData
}

// ID ...
func (*InventoryTransaction) ID() uint32 {
	return packet.IDInventoryTransaction
}

func (pk *InventoryTransaction) Marshal(io protocol.IO) {
	io.Varint32(&pk.LegacyRequestID)
	if pk.LegacyRequestID != 0 {
		protocol.Slice(io, &pk.LegacySetItemSlots)
	}
	proto.TransactionDataType(io, &pk.TransactionData)
	protocol.Slice(io, &pk.Actions)
	pk.TransactionData.Marshal(io)
}