class_name NpcContent
extends RefCounted
## Computes available_moves — the single home of move legality (§6). Reads the
## NPC's non-spoiler capability block and filters by live game state so the model
## is shown exactly what it may legally do this turn. persona/knowledge on the
## same file are server-only and ignored here.

const UNIVERSAL := ["adjust_disposition", "refuse", "end_conversation", "become_hostile"]


static func available_moves(npc_dict: Dictionary, game_state, canon_log) -> Array:
	var moves: Array = []
	var caps: Dictionary = npc_dict.get("capabilities", {})

	for q in caps.get("offerable_quests", []):
		if not canon_log.has_quest(q):
			moves.append("offer_quest(%s)" % q)

	for t in caps.get("revealable_topics", []):
		if not game_state.is_revealed(t):
			moves.append("reveal(%s)" % t)

	for i in caps.get("giveable_items", []):
		# Currency is exempt from the one-shot gift gate — an NPC can pay you twice.
		if Currency.is_currency(i) or not game_state.is_gift_given(i):
			moves.append("give_item(%s)" % i)

	for item_id in game_state.inventory.keys():
		if int(game_state.inventory[item_id]) > 0:
			moves.append("accept_item(%s)" % item_id)

	# Money is not in the inventory dict, so it needs its own offer. Only the
	# denominations the purse can actually pay: an NPC cannot ask a party holding
	# 47c for a gold coin.
	for denom in Currency.VALUES:
		if game_state.purse_copper >= Currency.value(denom):
			moves.append("accept_item(%s)" % denom)

	moves.append_array(UNIVERSAL)
	return moves