# atlas_navigation_system.gd —— 40250 Atlas M 键全景大地图与 NPC 寻路导航光标系统 1:1
# 严格对照：
#   Client/Eternexus/root/uiminimap.py (AtlasWindow, MiniMap)
#   ClientVS22/source/UserInterface/PythonMiniMap.cpp, PythonMiniMap.h (AddSignalPoint, ClearAllSignalPoint)
#   Client/Eternexus/root/atlasinfo.txt
extends RefCounted

# 地图手绘全景 Atlas 纹理与尺寸映射
const MAP_ATLAS_REGISTRY := {
	"metin2_map_a1": { "name": "赤蛇国主城 (Yongan)", "size": Vector2(256, 256), "world_size": Vector2(4000, 4000) },
	"metin2_map_b1": { "name": "白虎国主城 (Joan)",   "size": Vector2(256, 256), "world_size": Vector2(4000, 4000) },
	"metin2_map_c1": { "name": "苍龙国主城 (Pyungmoo)", "size": Vector2(256, 256), "world_size": Vector2(4000, 4000) },
	"metin2_map_milgyo": { "name": "幽冥神殿 (Dark Temple)", "size": Vector2(256, 256), "world_size": Vector2(2000, 2000) },
	"metin2_map_deviltower": { "name": "恶魔之塔 (Demon Tower)", "size": Vector2(256, 256), "world_size": Vector2(1000, 1000) },
}

# 官方预设标准城镇 NPC 索引目录 (NPC VID -> 数据)
const PRESET_TOWN_NPCS := [
	{ "vid": 20016, "name": "铁匠 (Blacksmith)", "category": "Smith", "pos": Vector2(580, 620) },
	{ "vid": 9001,  "name": "武器商人 (Weapon Dealer)", "category": "Shop", "pos": Vector2(610, 630) },
	{ "vid": 9002,  "name": "防具商人 (Armor Dealer)", "category": "Shop", "pos": Vector2(590, 650) },
	{ "vid": 9003,  "name": "杂货商人 (General Store)", "category": "Shop", "pos": Vector2(630, 600) },
	{ "vid": 9005,  "name": "仓库保管员 (Storekeeper)", "category": "Safebox", "pos": Vector2(550, 580) },
	{ "vid": 20084, "name": "生物学家采吉拉布 (Biologist)", "category": "Quest", "pos": Vector2(680, 520) },
	{ "vid": 20092, "name": "老行商 (Old Wanderer)", "category": "Special", "pos": Vector2(450, 710) },
	{ "vid": 20008, "name": "城门守卫 (City Guard)", "category": "Guard", "pos": Vector2(800, 800) },
	{ "vid": 20001, "name": "药店掌柜 (Alchemist)", "category": "Craft", "pos": Vector2(520, 640) },
	{ "vid": 20091, "name": "修仙道长 (Taoist)", "category": "Skill", "pos": Vector2(640, 750) },
]

# 状态变量
var is_atlas_visible: bool = false
var current_map_id: String = "metin2_map_a1"
var zoom_level: float = 1.0           # 滚轮缩放倍率 (0.5x ~ 3.0x)
var pan_offset: Vector2 = Vector2.ZERO # 拖拽平移偏移

# 动态信标点列表 (1:1 CPythonMiniMap::m_SignalPointVector)
var signal_points: Array = []

func _init(map_id: String = "metin2_map_a1") -> void:
	current_map_id = map_id
	is_atlas_visible = false
	zoom_level = 1.0
	pan_offset = Vector2.ZERO
	signal_points.clear()

# 1. M 键快捷切换全景大地图 (1:1 ToggleAtlasWindow)
func toggle_atlas() -> bool:
	is_atlas_visible = !is_atlas_visible
	return is_atlas_visible

func show_atlas() -> void:
	is_atlas_visible = true

func hide_atlas() -> void:
	is_atlas_visible = false

# 2. 切换当前地图与底图载入 (SetMapName)
func set_map(map_id: String) -> bool:
	if not MAP_ATLAS_REGISTRY.has(map_id):
		return false
	current_map_id = map_id
	clear_all_signals()
	pan_offset = Vector2.ZERO
	zoom_level = 1.0
	return true

func get_current_map_info() -> Dictionary:
	return MAP_ATLAS_REGISTRY.get(current_map_id, {})

# 3. 缩放与平移控制
func set_zoom(zoom: float) -> void:
	zoom_level = clamp(zoom, 0.5, 3.0)

func apply_pan(delta_offset: Vector2) -> void:
	pan_offset += delta_offset

# 4. NPC 目录检索与过滤
func get_npcs(category_filter: String = "") -> Array:
	if category_filter.is_empty():
		return PRESET_TOWN_NPCS
	var filtered: Array = []
	for npc in PRESET_TOWN_NPCS:
		if npc.get("category") == category_filter:
			filtered.append(npc)
	return filtered

func find_npc_by_vid(vid: int) -> Dictionary:
	for npc in PRESET_TOWN_NPCS:
		if npc.get("vid") == vid:
			return npc
	return {}

# 5. 信标寻路导航点机制 (1:1 CPythonMiniMap::AddSignalPoint / ClearAllSignalPoint)
func add_signal_point(target_x: float, target_y: float) -> Dictionary:
	var pt := {
		"x": target_x,
		"y": target_y,
		"active": true
	}
	signal_points.append(pt)
	return pt

func clear_all_signals() -> void:
	signal_points.clear()

# 6. 指南针方位角与距离计算 (角色与目标间的连线向量)
func calculate_navigation_vector(player_pos: Vector2, target_pos: Vector2) -> Dictionary:
	var diff := target_pos - player_pos
	var dist := diff.length()
	var angle_rad := diff.angle()
	var angle_deg := rad_to_deg(angle_rad)

	return {
		"distance": dist,
		"direction_vector": diff.normalized() if dist > 0.001 else Vector2.ZERO,
		"angle_rad": angle_rad,
		"angle_deg": angle_deg,
		"arrived": (dist <= 30.0) # 30 码内视为到达目标
	}

# 7. 世界坐标至大地图 UI 局部像素坐标投影转换
func world_to_atlas_coord(world_pos: Vector2) -> Vector2:
	var map_info := get_current_map_info()
	var world_size: Vector2 = map_info.get("world_size", Vector2(4000, 4000))
	var atlas_size: Vector2 = map_info.get("size", Vector2(256, 256))

	var ratio_x := atlas_size.x / world_size.x
	var ratio_y := atlas_size.y / world_size.y

	var projected := Vector2(world_pos.x * ratio_x, world_pos.y * ratio_y)
	return (projected * zoom_level) + pan_offset