class_name MoveApplier
extends RefCounted
## Writes validated §6 moves to game state. Town-NPC disposition lives in
## GameState.npc_dispositions (NOT CanonLog.party — that is companions only).
## Called by the conversation caller after NpcService.speak, so state writes
## stay explicit (§2). Unknown move names are ignored (they never pass the
## validator, but this stays defensive).

const MAX_DELTA := 15       # one line cannot swing standing wholesale (§7 spirit)
const HOSTILE_FLOOR := -100


static func apply(moves: Array, game_state, canon_log, content_db, npc_id: String) -> void:
	for move in moves:
		var name: String = move.get("name", "")
		var args: Array = move.get("args", [])
		match name:
			"offer_quest":
				var q: String = str(args[0])
				var qd: Dictionary = content_db.quest(q)
				canon_log.add_quest(q, qd.get("name", ""), qd.get("objective", ""))
			"reveal":
				game_state.mark_revealed(str(args[0]))
			"give_item":
				var i: String = str(args[0])
				game_state.grant(i, 1)
				if not Currency.is_currency(i):
					game_state.mark_gift_given(i)  # the one-shot gate is for real items only
			"accept_item":
				game_state.take(str(args[0]), 1)
			"adjust_disposition":
				var delta: int = clampi(int(str(args[0])), -MAX_DELTA, MAX_DELTA)
				var cur: int = int(game_state.npc_dispositions.get(npc_id, 0))
				game_state.set_npc_disposition(npc_id, cur + delta)
			"become_hostile":
				game_state.set_npc_disposition(npc_id, HOSTILE_FLOOR)
			_:
				pass  # refuse, end_conversation, and anything unknown: no state