From ec6387c2c7714efa716cad5a647478fe78d8ce2d Mon Sep 17 00:00:00 2001
From: Natalie <natalie@lilithuwu.com>
Date: Sat, 18 Apr 2026 17:16:02 -0700
Subject: [PATCH] =?UTF-8?q?feat(ai):=20=E2=9C=A8=20add=20unit=20catalog=20?=
 =?UTF-8?q?builder=20for=20tactical=20state?=
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Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>
---
 .../engine/src/modules/ai/ai_turn_bridge.gd   | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/src/game/engine/src/modules/ai/ai_turn_bridge.gd b/src/game/engine/src/modules/ai/ai_turn_bridge.gd
index 9391bc4e..061d215c 100644
--- a/src/game/engine/src/modules/ai/ai_turn_bridge.gd
+++ b/src/game/engine/src/modules/ai/ai_turn_bridge.gd
@@ -220,9 +220,41 @@ static func _build_tactical_state(focal: RefCounted) -> Dictionary:
 		"turn": int(GameState.turn_number),
 		"map": {"width": width, "height": height, "tiles": tiles},
 		"players": players,
+		"unit_catalog": _build_unit_catalog(),
 	}
 
 
+static func _build_unit_catalog() -> Array:
+	# Emit the unit catalog for `tactical::production::pick_best_melee` (p0-39).
+	# Populated from DataLoader's unit pack; tier-2+ units carry
+	# `tech_required` which the Rust helper filters against each player's
+	# `researched_techs`. All unit kinds included — Rust filters by
+	# `unit_type == "military"` at selection time.
+	var out: Array = []
+	var data: Dictionary = DataLoader.get_data("units")
+	if data == null:
+		return out
+	for uid: String in data.keys():
+		var entry: Dictionary = data.get(uid, {})
+		if entry == null or entry.is_empty():
+			continue
+		var tier_raw: int = int(entry.get("tier", 1))
+		var tech_raw: String = String(entry.get("tech_required", ""))
+		var tech_dict_val: Dictionary = {}
+		if tech_raw.is_empty():
+			tech_dict_val = {"tech_required": null}
+		else:
+			tech_dict_val = {"tech_required": tech_raw}
+		var item: Dictionary = {
+			"id": String(entry.get("id", uid)),
+			"tier": tier_raw,
+			"unit_type": String(entry.get("unit_type", "military")),
+		}
+		item.merge(tech_dict_val)
+		out.append(item)
+	return out
+
+
 static func _tile_to_dict(game_map: RefCounted, col: int, row: int) -> Dictionary:
 	var tile: Resource = game_map.get_tile(Vector2i(col, row))
 	if tile == null: