From 1ccbf1b8e8f822e7c24d2e1e8792688a4a81e733 Mon Sep 17 00:00:00 2001
From: Ethan Moffat <ethan@moffat.io>
Date: Fri, 26 May 2023 10:47:53 -0700
Subject: [PATCH] Implement NPCDialogHandler for priest chat on GameServer

---
 EOLib/PacketHandlers/NPC/NPCDialogHandler.cs | 71 ++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 EOLib/PacketHandlers/NPC/NPCDialogHandler.cs

diff --git a/EOLib/PacketHandlers/NPC/NPCDialogHandler.cs b/EOLib/PacketHandlers/NPC/NPCDialogHandler.cs
new file mode 100644
index 000000000..072f2c527
--- /dev/null
+++ b/EOLib/PacketHandlers/NPC/NPCDialogHandler.cs
@@ -0,0 +1,71 @@
+using AutomaticTypeMapper;
+using EOLib.Domain.Chat;
+using EOLib.Domain.Login;
+using EOLib.Domain.Map;
+using EOLib.Domain.Notifiers;
+using EOLib.IO.Repositories;
+using EOLib.Net;
+using EOLib.Net.Handlers;
+using Optional;
+using Optional.Collections;
+using System.Collections.Generic;
+
+namespace EOLib.PacketHandlers.NPC
+{
+    /// <summary>
+    /// Special dialog packet for NPC speech. Sent by GameServer when the priest talks.
+    /// </summary>
+    [AutoMappedType]
+    public class NPCDialogHandler : InGameOnlyPacketHandler
+    {
+        private readonly ICurrentMapStateRepository _currentMapStateRepository;
+        private readonly IENFFileProvider _enfFileProvider;
+        private readonly IChatRepository _chatRepository;
+        private readonly IEnumerable<INPCActionNotifier> _npcActionNotifiers;
+
+        public override PacketFamily Family => PacketFamily.NPC;
+
+        public override PacketAction Action => PacketAction.Dialog;
+
+        public NPCDialogHandler(IPlayerInfoProvider playerInfoProvider,
+                                ICurrentMapStateRepository currentMapStateRepository,
+                                IENFFileProvider enfFileProvider,
+                                IChatRepository chatRepository,
+                                IEnumerable<INPCActionNotifier> npcActionNotifiers)
+            : base(playerInfoProvider)
+        {
+            _currentMapStateRepository = currentMapStateRepository;
+            _enfFileProvider = enfFileProvider;
+            _chatRepository = chatRepository;
+            _npcActionNotifiers = npcActionNotifiers;
+        }
+
+        // note: this is the same implementation as NPCPlayerHandler::HandleNPCTalk
+        public override bool HandlePacket(IPacket packet)
+        {
+            var index = packet.ReadShort();
+            var message = packet.ReadEndString();
+
+            var npc = GetNPC(index);
+            npc.Match(
+                some: n =>
+                {
+                    var npcData = _enfFileProvider.ENFFile[n.ID];
+
+                    var chatData = new ChatData(ChatTab.Local, npcData.Name, message, ChatIcon.Note, filter: false);
+                    _chatRepository.AllChat[ChatTab.Local].Add(chatData);
+
+                    foreach (var notifier in _npcActionNotifiers)
+                        notifier.ShowNPCSpeechBubble(index, message);
+                },
+                none: () => _currentMapStateRepository.UnknownNPCIndexes.Add(index));
+
+            return true;
+        }
+
+        private Option<Domain.NPC.NPC> GetNPC(int index)
+        {
+            return _currentMapStateRepository.NPCs.SingleOrNone(n => n.Index == index);
+        }
+    }
+}