[Commands] Add #viewzoneloot [item id] command. (#1382)

* [Commands] Add #viewzoneloot [item id] command.
- Allows GMs to search for a specific item across all the loot currently available on the spawned NPCs in the zone.
- Specifying item ID 0 will allow GMs to see all the droppable items, I tested in Sanctus Seru (a huge zone) and it sent approximately 1,200 messages, which didn't lag or desync my client.

* Adjustments.

* Adjustments.

zone/command.cpp

@@ -433,6 +433,7 @@ int command_init(void)
 		command_add("version", "- Display current version of EQEmu server", 0, command_version) ||
 		command_add("viewnpctype", "[npctype id] - Show info about an npctype", 100, command_viewnpctype) ||
 		command_add("viewpetition", "[petition number] - View a petition", 20, command_viewpetition) ||
+		command_add("viewzoneloot", "[item id] - Allows you to search a zone's loot for a specific item ID. (0 shows all loot in the zone)", 80, command_viewzoneloot) ||
 		command_add("wc", "[wear slot] [material] - Sends an OP_WearChange for your target", 200, command_wc) ||
 		command_add("weather", "[0/1/2/3] (Off/Rain/Snow/Manual) - Change the weather", 80, command_weather) ||
 		command_add("who", "[search]", 20, command_who) ||
@@ -14106,6 +14107,115 @@ void command_network(Client *c, const Seperator *sep)
 	}
 }
 
+void command_viewzoneloot(Client *c, const Seperator *sep)
+{
+	std::map<uint32,ItemList> zone_loot_list;
+	auto npc_list = entity_list.GetNPCList();
+	uint32 loot_amount = 0, loot_id = 1, search_item_id = 0;
+	if (sep->argnum == 1 && sep->IsNumber(1)) {
+		search_item_id = atoi(sep->arg[1]);
+	} else if (sep->argnum == 1 && !sep->IsNumber(1)) {
+		c->Message(
+			Chat::Yellow,
+			"Usage: #viewzoneloot [item id]"
+		);
+		return;
+	}
+	for (auto npc_entity : npc_list) {
+		auto current_npc_item_list = npc_entity.second->GetItemList();
+		zone_loot_list.insert({ npc_entity.second->GetID(), current_npc_item_list });
+	}
+	for (auto loot_item : zone_loot_list) {
+		uint32 current_entity_id = loot_item.first;
+		auto current_item_list = loot_item.second;
+		auto current_npc = entity_list.GetNPCByID(current_entity_id);
+		std::string npc_link;
+		if (current_npc) {
+			std::string npc_name = current_npc->GetCleanName();
+			uint32 instance_id = zone->GetInstanceID();
+			uint32 zone_id = zone->GetZoneID();
+			std::string command_link = EQ::SayLinkEngine::GenerateQuestSaylink(
+				fmt::format(
+					"#{} {} {} {} {}",
+					(instance_id != 0 ? "zoneinstance" : "zone"),
+					(instance_id != 0 ? instance_id : zone_id),
+					current_npc->GetX(),
+					current_npc->GetY(),
+					current_npc->GetZ()
+				),
+				false,
+				"Goto"
+			);
+			npc_link = fmt::format(
+				" NPC: {} (ID {}) [{}]",
+				npc_name,
+				current_entity_id,
+				command_link
+			);
+		}
+
+		for (auto current_item : current_item_list) {
+			if (search_item_id == 0 || current_item->item_id == search_item_id) {
+				EQ::SayLinkEngine linker;
+				linker.SetLinkType(EQ::saylink::SayLinkLootItem);
+				linker.SetLootData(current_item);
+				c->Message(
+					Chat::White,
+					fmt::format(
+						"{}. {} ({}){}",
+						loot_id,
+						linker.GenerateLink(),
+						current_item->item_id,
+						npc_link
+					).c_str()
+				);
+				loot_id++;
+				loot_amount++;
+			}
+		}
+	}
+
+	
+	if (search_item_id != 0) {
+		std::string drop_string = (
+			loot_amount > 0 ?
+			fmt::format(
+				"dropping in {} {}",
+				loot_amount,
+				(loot_amount > 1 ? "places" : "place")
+			) :
+			"not dropping"
+		);
+		c->Message(
+			Chat::White,
+			fmt::format(
+				"{} ({}) is {}.",
+				database.CreateItemLink(search_item_id),
+				search_item_id,
+				drop_string
+			).c_str()
+		);
+	} else {
+		std::string drop_string = (
+			loot_amount > 0 ?
+			fmt::format(
+				"{} {} {}",
+				(loot_amount > 1 ? "items" : "item"),
+				(loot_amount > 1 ? "are" : "is"),
+				(loot_amount > 1 ? "dropping" : "not dropping")
+			) :
+			"items are dropping"
+		);
+		c->Message(
+			Chat::White,
+			fmt::format(
+				"{} {}.",
+				loot_amount,
+				drop_string
+			).c_str()
+		);	
+	}
+}
 // All new code added to command.cpp should be BEFORE this comment line. Do no append code to this file below the BOTS code block.
 #ifdef BOTS
 #include "bot_command.h"

zone/command.h

@@ -354,6 +354,7 @@ void command_zone(Client *c, const Seperator *sep);
 void command_zone_instance(Client *c, const Seperator *sep);
 void command_zonebootup(Client *c, const Seperator *sep);
 void command_zonelock(Client *c, const Seperator *sep);
+void command_viewzoneloot(Client *c, const Seperator *sep);
 void command_zoneshutdown(Client *c, const Seperator *sep);
 void command_zonespawn(Client *c, const Seperator *sep);
 void command_zonestatus(Client *c, const Seperator *sep);

zone/npc.h

@@ -198,6 +198,7 @@ public:
 	void	RemoveItem(uint32 item_id, uint16 quantity = 0, uint16 slot = 0);
 	void	CheckTrivialMinMaxLevelDrop(Mob *killer);
 	void	ClearItemList();
+	inline const ItemList &GetItemList() { return itemlist; }
 	ServerLootItem_Struct*	GetItem(int slot_id);
 	void	AddCash(uint16 in_copper, uint16 in_silver, uint16 in_gold, uint16 in_platinum);
 	void	AddCash();