[Feature] Add opcodes for Cast and Scribe book buttons (#3578)

This is just the packet framework for the Scribe button on recipe books
and the Cast Spell button on books that allow casting spells on
targets. It will need to be hooked up to a content implementation

zone/client.cpp

@@ -2211,25 +2211,13 @@ void Client::ReadBook(BookRequest_Struct *book) {
 
 
 		if (ClientVersion() >= EQ::versions::ClientVersion::SoF) {
-			// Find out what slot the book was read from.
 			// SoF+ need to look up book type for the output message.
-			int16	read_from_slot;
-
-			if (book->subslot >= 0) {
-				uint16 offset;
-				offset = (book->invslot-23) * 10;	// How many packs to skip.
-				read_from_slot = 251 + offset + book->subslot;
-			}
-			else {
-				read_from_slot = book->invslot -1;
-			}
-
 			const EQ::ItemInstance *inst = nullptr;
 
-			if (read_from_slot <= EQ::invbag::GENERAL_BAGS_END)
-				{
-				inst = m_inv[read_from_slot];
-				}
+			if (book->invslot <= EQ::invbag::GENERAL_BAGS_END)
+			{
+				inst = m_inv[book->invslot];
+			}
 
 			if(inst)
 				out->type = inst->GetItem()->Book;
@@ -2240,6 +2228,9 @@ void Client::ReadBook(BookRequest_Struct *book) {
 			out->type = book->type;
 		}
 		out->invslot = book->invslot;
+		out->target_id = book->target_id;
+		out->can_cast = 0; // todo: implement
+		out->can_scribe = 0; // todo: implement
 
 		memcpy(out->booktext, booktxt2.c_str(), length);
 

zone/client_packet.cpp

@@ -145,6 +145,7 @@ void MapOpcodes()
 	ConnectedOpcodes[OP_Bind_Wound] = &Client::Handle_OP_Bind_Wound;
 	ConnectedOpcodes[OP_BlockedBuffs] = &Client::Handle_OP_BlockedBuffs;
 	ConnectedOpcodes[OP_BoardBoat] = &Client::Handle_OP_BoardBoat;
+	ConnectedOpcodes[OP_BookButton] = &Client::Handle_OP_BookButton;
 	ConnectedOpcodes[OP_Buff] = &Client::Handle_OP_Buff;
 	ConnectedOpcodes[OP_BuffRemoveRequest] = &Client::Handle_OP_BuffRemoveRequest;
 	ConnectedOpcodes[OP_Bug] = &Client::Handle_OP_Bug;
@@ -4130,6 +4131,28 @@ void Client::Handle_OP_BoardBoat(const EQApplicationPacket *app)
 	return;
 }
 
+void Client::Handle_OP_BookButton(const EQApplicationPacket* app)
+{
+	if (app->size != sizeof(BookButton_Struct))
+	{
+		LogError("Size mismatch in OP_BookButton. expected [{}] got [{}]", sizeof(BookButton_Struct), app->size);
+		DumpPacket(app);
+		return;
+	}
+
+	BookButton_Struct* book = reinterpret_cast<BookButton_Struct*>(app->pBuffer);
+
+	const EQ::ItemInstance* const inst = GetInv().GetItem(book->invslot);
+	if (inst && inst->GetItem()->Book)
+	{
+		// todo: if scribe book learn recipes and delete book from inventory
+		// todo: if cast book use its spell on target and delete book from inventory (unless reusable?)
+	}
+
+	EQApplicationPacket outapp(OP_FinishWindow, 0);
+	QueuePacket(&outapp);
+}
+
 void Client::Handle_OP_Buff(const EQApplicationPacket *app)
 {
 	/*

zone/client_packet.h

@@ -56,6 +56,7 @@
 	void Handle_OP_Bind_Wound(const EQApplicationPacket *app);
 	void Handle_OP_BlockedBuffs(const EQApplicationPacket *app);
 	void Handle_OP_BoardBoat(const EQApplicationPacket *app);
+	void Handle_OP_BookButton(const EQApplicationPacket *app);
 	void Handle_OP_Buff(const EQApplicationPacket *app);
 	void Handle_OP_BuffRemoveRequest(const EQApplicationPacket *app);
 	void Handle_OP_Bug(const EQApplicationPacket *app);