From d1a7fd7da118d9470c037f7374445f0f086ede6a Mon Sep 17 00:00:00 2001
From: Bryce Wilson <gyroscope15@gmail.com>
Date: Fri, 23 Aug 2024 17:51:52 -0700
Subject: [PATCH] Pokemon Emerald: Send current map to trackers (#3726)

---
 worlds/pokemon_emerald/client.py | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/worlds/pokemon_emerald/client.py b/worlds/pokemon_emerald/client.py
index a830957e9c7e..eeae3a5248a5 100644
--- a/worlds/pokemon_emerald/client.py
+++ b/worlds/pokemon_emerald/client.py
@@ -137,6 +137,8 @@ class PokemonEmeraldClient(BizHawkClient):
     previous_death_link: float
     ignore_next_death_link: bool
 
+    current_map: Optional[int]
+
     def __init__(self) -> None:
         super().__init__()
         self.local_checked_locations = set()
@@ -150,6 +152,7 @@ def __init__(self) -> None:
         self.death_counter = None
         self.previous_death_link = 0
         self.ignore_next_death_link = False
+        self.current_map = None
 
     async def validate_rom(self, ctx: "BizHawkClientContext") -> bool:
         from CommonClient import logger
@@ -243,6 +246,7 @@ async def game_watcher(self, ctx: "BizHawkClientContext") -> None:
             sb1_address = int.from_bytes(guards["SAVE BLOCK 1"][1], "little")
             sb2_address = int.from_bytes(guards["SAVE BLOCK 2"][1], "little")
 
+            await self.handle_tracker_info(ctx, guards)
             await self.handle_death_link(ctx, guards)
             await self.handle_received_items(ctx, guards)
             await self.handle_wonder_trade(ctx, guards)
@@ -403,6 +407,31 @@ async def game_watcher(self, ctx: "BizHawkClientContext") -> None:
             # Exit handler and return to main loop to reconnect
             pass
 
+    async def handle_tracker_info(self, ctx: "BizHawkClientContext", guards: Dict[str, Tuple[int, bytes, str]]) -> None:
+        # Current map
+        sb1_address = int.from_bytes(guards["SAVE BLOCK 1"][1], "little")
+
+        read_result = await bizhawk.guarded_read(
+            ctx.bizhawk_ctx,
+            [(sb1_address + 0x4, 2, "System Bus")],
+            [guards["SAVE BLOCK 1"]]
+        )
+        if read_result is None:  # Save block moved
+            return
+
+        current_map = int.from_bytes(read_result[0], "big")
+        if current_map != self.current_map:
+            self.current_map = current_map
+            await ctx.send_msgs([{
+                "cmd": "Bounce",
+                "slots": [ctx.slot],
+                "tags": ["Tracker"],
+                "data": {
+                    "type": "MapUpdate",
+                    "mapId": current_map,
+                },
+            }])
+
     async def handle_death_link(self, ctx: "BizHawkClientContext", guards: Dict[str, Tuple[int, bytes, str]]) -> None:
         """
         Checks whether the player has died while connected and sends a death link if so. Queues a death link in the game