implement 6xDE command

src/CommandFormats.hh

@@ -849,15 +849,17 @@ struct SC_GameGuardCheck_BB_0022 {
 // header.flag indicates if an item was exchanged: 0 means success, 1 means
 // failure.
 
-// 24 (S->C): Good Luck result (BB)
+// 24 (S->C): Secret Lottery Ticket exchange result (BB)
 // Sent in response to a 6xDE command from the client.
 // header.flag indicates whether the client had any Secret Lottery Tickets in
 // their inventory (and hence could participate): 0 means success, 1 means
 // failure.
 
-struct S_GoodLuckResult_BB_24 {
-  le_uint16_t unknown_a1 = 0;
+struct S_ExchangeSecretLotteryTicketResult_BB_24 {
+  // These fields map to unknown_a1 and unknown_a2 in the 6xDE command (but
+  // their order is swapped here).
   le_uint16_t unknown_a2 = 0;
+  le_uint16_t unknown_a1 = 0;
   parray<le_uint32_t, 8> unknown_a3;
 } __packed__;
 
@@ -5672,7 +5674,7 @@ struct G_UpgradeWeaponAttribute_BB_6xDA {
 struct G_ExchangeItemInQuest_BB_6xDB {
   G_ClientIDHeader header;
   le_uint32_t unknown_a1 = 0;
-  le_uint32_t unknown_a2 = 0;
+  le_uint32_t item_id = 0;
   le_uint32_t unknown_a3 = 0;
 } __packed__;
 
@@ -5692,20 +5694,20 @@ struct G_SetEXPMultiplier_BB_6xDD {
   G_ParameterHeader header;
 } __packed__;
 
-// 6xDE: Good Luck quest (BB; handled by server)
+// 6xDE: Exchange Secret Lottery Ticket (BB; handled by server)
 // The client sends this when it executes an F95C quest opcode.
 
-struct G_GoodLuckQuestActions_BB_6xDE {
+struct G_ExchangeSecretLotteryTicket_BB_6xDE {
   G_ClientIDHeader header;
   uint8_t unknown_a1 = 0;
   uint8_t unknown_a2 = 0;
   le_uint16_t unknown_a3 = 0;
 } __packed__;
 
-// 6xDF: Black Paper's Deal Photon Crystal exchange (BB; handled by server)
+// 6xDF: Exchange Photon Crystals (BB; handled by server)
 // The client sends this when it executes an F95D quest opcode.
 
-struct G_BlackPaperDealPhotonCrystalExchange_BB_6xDF {
+struct G_ExchangePhotonCrystals_BB_6xDF {
   G_ClientIDHeader header;
 } __packed__;
 

src/ReceiveSubcommands.cc

@@ -2291,10 +2291,65 @@ static void on_photon_drop_exchange_bb(shared_ptr<Client> c, uint8_t, uint8_t, c
   }
 }
 
+static void on_secret_lottery_ticket_exchange_bb(shared_ptr<Client> c, uint8_t, uint8_t, const void* data, size_t size) {
+  auto s = c->require_server_state();
+  auto l = c->require_lobby();
+  if (l->is_game() && (l->base_version == GameVersion::BB) && l->check_flag(Lobby::Flag::QUEST_IN_PROGRESS)) {
+    const auto& cmd = check_size_t<G_ExchangeSecretLotteryTicket_BB_6xDE>(data, size);
+
+    if (s->secret_lottery_results.empty()) {
+      throw runtime_error("no secret lottery results are defined");
+    }
+
+    auto p = c->game_data.character();
+    ssize_t slt_index = -1;
+    try {
+      slt_index = p->inventory.find_item_by_primary_identifier(0x031003); // Secret Lottery Ticket
+    } catch (const out_of_range&) {
+    }
+
+    if (slt_index >= 0) {
+      uint32_t slt_item_id = p->inventory.items[slt_index].data.id;
+
+      G_ExchangeItemInQuest_BB_6xDB exchange_cmd;
+      exchange_cmd.header.subcommand = 0xDB;
+      exchange_cmd.header.size = 4;
+      exchange_cmd.header.client_id = c->lobby_client_id;
+      exchange_cmd.unknown_a1 = 1;
+      exchange_cmd.item_id = slt_item_id;
+      exchange_cmd.unknown_a3 = 1;
+      send_command_t(c, 0x60, 0x00, exchange_cmd);
+
+      send_destroy_item(c, slt_item_id, 1);
+
+      ItemData item = (s->secret_lottery_results.size() == 1)
+          ? s->secret_lottery_results[0]
+          : s->secret_lottery_results[random_object<uint32_t>() % s->secret_lottery_results.size()];
+      item.id = l->generate_item_id(c->lobby_client_id);
+      p->add_item(item);
+      send_create_inventory_item(c, item);
+    }
+
+    S_ExchangeSecretLotteryTicketResult_BB_24 out_cmd;
+    out_cmd.unknown_a1 = cmd.unknown_a1;
+    out_cmd.unknown_a2 = cmd.unknown_a2;
+    if (s->secret_lottery_results.empty()) {
+      out_cmd.unknown_a3.clear(0);
+    } else if (s->secret_lottery_results.size() == 1) {
+      out_cmd.unknown_a3.clear(1);
+    } else {
+      for (size_t z = 0; z < out_cmd.unknown_a3.size(); z++) {
+        out_cmd.unknown_a3[z] = random_object<uint32_t>() % s->secret_lottery_results.size();
+      }
+    }
+    send_command_t(c, 0x24, (slt_index >= 0) ? 0 : 1, out_cmd);
+  }
+}
+
 static void on_photon_crystal_exchange_bb(shared_ptr<Client> c, uint8_t, uint8_t, const void* data, size_t size) {
   auto l = c->require_lobby();
   if (l->is_game() && (l->base_version == GameVersion::BB) && l->check_flag(Lobby::Flag::QUEST_IN_PROGRESS)) {
-    check_size_t<G_BlackPaperDealPhotonCrystalExchange_BB_6xDF>(data, size);
+    check_size_t<G_ExchangePhotonCrystals_BB_6xDF>(data, size);
     auto p = c->game_data.character();
     size_t index = p->inventory.find_item_by_primary_identifier(0x031002);
     auto item = p->remove_item(p->inventory.items[index].data.id, 1, false);
@@ -2648,7 +2703,7 @@ subcommand_handler_t subcommand_handlers[0x100] = {
     /* 6xDB */ nullptr,
     /* 6xDC */ on_forward_check_size_game,
     /* 6xDD */ nullptr,
-    /* 6xDE */ nullptr,
+    /* 6xDE */ on_secret_lottery_ticket_exchange_bb,
     /* 6xDF */ on_photon_crystal_exchange_bb,
     /* 6xE0 */ on_quest_F95E_result_bb,
     /* 6xE1 */ nullptr,

src/ServerState.cc

@@ -715,6 +715,15 @@ void ServerState::parse_config(const JSON& json, bool is_reload) {
   } catch (const out_of_range&) {
   }
 
+  try {
+    this->secret_lottery_results.clear();
+    for (const auto& it : json.get_list("SecretLotteryResultItems")) {
+      string data = parse_data_string(it->as_string());
+      this->secret_lottery_results.emplace_back(ItemData::from_data(data));
+    }
+  } catch (const out_of_range&) {
+  }
+
   set_log_levels_from_json(json.get("LogLevels", JSON::dict()));
 
   if (!is_reload) {

src/ServerState.hh

@@ -115,6 +115,7 @@ struct ServerState : public std::enable_shared_from_this<ServerState> {
 
   // Indexed as [type][difficulty][random_choice]
   std::vector<std::vector<std::vector<ItemData>>> quest_F95E_results;
+  std::vector<ItemData> secret_lottery_results;
 
   std::shared_ptr<Episode3::TournamentIndex> ep3_tournament_index;