# CursorManager —— 对齐 ClientVS22 mousemodule.py 的光标状态机。
#
# 光标和“鼠标跟随物品”是两层：本节点只管理当前交互语义，
# MouseController 负责跟随鼠标的物品图标。使用 40250 的 .sub 纹理注册真实光标，
# 没有对应资源时回退到 Godot 系统光标。
extends Node

signal changed(shape: String)

const UiAssets = preload("res://ui/ui_assets.gd")

const NORMAL := "NORMAL"
const ATTACK := "ATTACK"
const TARGET := "TARGET"
const TALK := "TALK"
const CANT_GO := "CANT_GO"
const PICK := "PICK"
const DOOR := "DOOR"
const CHAIR := "CHAIR"
const MAGIC := "MAGIC"
const BUY := "BUY"
const SELL := "SELL"
const CAMERA_ROTATE := "CAMERA_ROTATE"
const HSIZE := "HSIZE"
const VSIZE := "VSIZE"
const HVSIZE := "HVSIZE"
const ITEM := "ITEM"

const ALL_CURSORS := [
	NORMAL, ATTACK, TARGET, TALK, CANT_GO, PICK, DOOR, CHAIR, MAGIC,
	BUY, SELL, CAMERA_ROTATE, HSIZE, VSIZE, HVSIZE, ITEM
]

var _shape := NORMAL
var _assets_root := ""
var _custom_cursors_registered := false
var _cursor_images: Dictionary = {}

func setup(assets_root: String) -> void:
	_assets_root = assets_root
	_register_custom_cursors()

func _register_custom_cursors() -> void:
	if _assets_root.is_empty():
		return
	var cursors := {
		NORMAL: "ETC/ymir work/ui/cursor/cursor.sub",
		ATTACK: "ETC/ymir work/ui/cursor/cursor_attack.sub",
		TARGET: "ETC/ymir work/ui/cursor/cursor_attack.sub",
		TALK: "ETC/ymir work/ui/cursor/cursor_talk.sub",
		CANT_GO: "ETC/ymir work/ui/cursor/cursor_no.sub",
		PICK: "ETC/ymir work/ui/cursor/cursor_pick.sub",
		DOOR: "ETC/ymir work/ui/cursor/cursor_door.sub",
		CHAIR: "ETC/ymir work/ui/cursor/cursor_chair.sub",
		MAGIC: "ETC/ymir work/ui/cursor/cursor_chair.sub",
		BUY: "ETC/ymir work/ui/cursor/cursor_buy.sub",
		SELL: "ETC/ymir work/ui/cursor/cursor_sell.sub",
		CAMERA_ROTATE: "ETC/ymir work/ui/cursor/cursor_camera_rotate.sub",
		HSIZE: "ETC/ymir work/ui/cursor/cursor_hsize.sub",
		VSIZE: "ETC/ymir work/ui/cursor/cursor_vsize.sub",
		HVSIZE: "ETC/ymir work/ui/cursor/cursor_hvsize.sub",
	}
	var shape_to_godot := {
		NORMAL: Input.CURSOR_ARROW,
		ATTACK: Input.CURSOR_CROSS,
		TALK: Input.CURSOR_POINTING_HAND,
		PICK: Input.CURSOR_CAN_DROP,
		CANT_GO: Input.CURSOR_FORBIDDEN,
		BUY: Input.CURSOR_DRAG,
		SELL: Input.CURSOR_MOVE,
		DOOR: Input.CURSOR_HELP,
		CHAIR: Input.CURSOR_WAIT,
		CAMERA_ROTATE: Input.CURSOR_BDIAGSIZE,
		HSIZE: Input.CURSOR_HSIZE,
		VSIZE: Input.CURSOR_VSIZE,
		HVSIZE: Input.CURSOR_FDIAGSIZE,
	}
	var hotspots := {
		HSIZE: Vector2(16, 16),
		VSIZE: Vector2(16, 16),
		HVSIZE: Vector2(16, 16),
	}
	for name in cursors:
		var rel: String = cursors[name]
		var tex: Texture2D = UiAssets.load_tex(_assets_root, rel)
		if tex != null:
			var img: Image = _extract_image(tex)
			if img != null:
				_cursor_images[name] = img
				var hs: Vector2 = hotspots.get(name, Vector2.ZERO)
				if shape_to_godot.has(name):
					Input.set_custom_mouse_cursor(img, shape_to_godot[name], hs)
	_custom_cursors_registered = true

func _extract_image(tex: Texture2D) -> Image:
	if tex is AtlasTexture:
		var at := tex as AtlasTexture
		if at.atlas:
			var base_img: Image = at.atlas.get_image()
			if base_img:
				var r := Rect2i(int(at.region.position.x), int(at.region.position.y), int(at.region.size.x), int(at.region.size.y))
				return base_img.get_region(r)
	elif tex:
		return tex.get_image()
	return null

func set_cursor(shape: String) -> void:
	if shape not in ALL_CURSORS:
		shape = NORMAL
	_shape = shape
	Input.set_default_cursor_shape(_godot_shape(shape))
	if _cursor_images.has(shape):
		var hs := Vector2(16, 16) if shape in [HSIZE, VSIZE, HVSIZE] else Vector2.ZERO
		Input.set_custom_mouse_cursor(_cursor_images[shape], Input.CURSOR_ARROW, hs)
	changed.emit(shape)

func get_cursor() -> String:
	return _shape

func reset() -> void:
	set_cursor(NORMAL)

func _godot_shape(shape: String) -> Input.CursorShape:
	match shape:
		ATTACK, TARGET:
			return Input.CURSOR_CROSS
		PICK:
			return Input.CURSOR_CAN_DROP
		TALK:
			return Input.CURSOR_POINTING_HAND
		DOOR:
			return Input.CURSOR_HELP
		CHAIR, MAGIC:
			return Input.CURSOR_WAIT
		BUY:
			return Input.CURSOR_DRAG
		SELL:
			return Input.CURSOR_MOVE
		CAMERA_ROTATE:
			return Input.CURSOR_BDIAGSIZE
		HSIZE:
			return Input.CURSOR_HSIZE
		VSIZE:
			return Input.CURSOR_VSIZE
		HVSIZE:
			return Input.CURSOR_FDIAGSIZE
		CANT_GO:
			return Input.CURSOR_FORBIDDEN
		ITEM:
			return Input.CURSOR_DRAG
		_:
			return Input.CURSOR_ARROW