# intro_empire_phase.gd —— 40250 三国阵营地貌 3D 运镜巡览系统 1:1
# 严格对照：
#   Client/Eternexus/root/introempire.py (SelectEmpireWindow)
#   ClientVS22/source/UserInterface/PythonApplicationCamera.cpp
#   Client/Eternexus/root/uiscript/locale/en/empiredesc_*.txt
extends RefCounted

const EMPIRE_NONE := 0
const EMPIRE_SHINSOO := 1    # 赤蛇国 (进国 / 红色)
const EMPIRE_CHUNJO := 2     # 白虎国 (顺天 / 黄色)
const EMPIRE_JINNO := 3      # 苍龙国 (忍国 / 蓝色)

# 三国官方 3D 摄像机观察预设点位 (Position & Rotation Degrees)
const CAMERA_PRESETS := {
	EMPIRE_SHINSOO: {
		"cam_pos": Vector3(100.0, 50.0, -200.0),
		"cam_rot": Vector3(-15.0, 45.0, 0.0),
		"name": "赤蛇国 (Shinsoo)",
		"capital": "Yongan",
		"color": "#FF3333",
		"desc": "Shinsoo 帝国雄踞大陆南部，商贸繁荣昌盛，是商旅与财富的汇聚之地。",
		"trait": "商贾通达：全帝国交易税率降低 2%，行商收益提升。"
	},
	EMPIRE_CHUNJO: {
		"cam_pos": Vector3(-150.0, 60.0, -180.0),
		"cam_rot": Vector3(-12.0, 135.0, 0.0),
		"name": "白虎国 (Chunjo)",
		"capital": "Joan",
		"color": "#FFCC00",
		"desc": "Chunjo 帝国坐落大陆西部，是古老圣灵信仰的发源地，奉行神圣天道。",
		"trait": "神圣庇佑：全帝国子民魔法防御力与精神抗性 +5%。"
	},
	EMPIRE_JINNO: {
		"cam_pos": Vector3(0.0, 80.0, -250.0),
		"cam_rot": Vector3(-18.0, 0.0, 0.0),
		"name": "苍龙国 (Jinno)",
		"capital": "Pyungmoo",
		"color": "#3366FF",
		"desc": "Jinno 帝国占据大陆东部，崇尚武道强权，铁血军纪森严，武士骁勇善战。",
		"trait": "尚武好战：全帝国子民物理基础攻击力 +5%。"
	}
}

var selected_empire: int = EMPIRE_SHINSOO
var current_cam_pos: Vector3 = Vector3.ZERO
var current_cam_rot: Vector3 = Vector3.ZERO
var target_cam_pos: Vector3 = Vector3.ZERO
var target_cam_rot: Vector3 = Vector3.ZERO
var is_transitioning: bool = false
var transition_t: float = 1.0

func _init(initial_empire: int = EMPIRE_SHINSOO) -> void:
	select_empire(initial_empire)
	current_cam_pos = target_cam_pos
	current_cam_rot = target_cam_rot
	is_transitioning = false
	transition_t = 1.0

# 1. 选中帝国阵营 (1:1 SelectEmpireWindow.OnSelectEmpire)
func select_empire(empire_id: int) -> bool:
	if not CAMERA_PRESETS.has(empire_id):
		return false

	selected_empire = empire_id
	var preset: Dictionary = CAMERA_PRESETS[empire_id]
	target_cam_pos = preset["cam_pos"]
	target_cam_rot = preset["cam_rot"]
	is_transitioning = true
	transition_t = 0.0
	return true

# 2. 摄像机平滑插值运镜更新 (1:1 PythonApplicationCamera::Update)
func update_camera_transition(delta_t: float) -> void:
	if not is_transitioning:
		return

	transition_t = clamp(transition_t + delta_t, 0.0, 1.0)
	current_cam_pos = current_cam_pos.lerp(target_cam_pos, transition_t)
	current_cam_rot = current_cam_rot.lerp(target_cam_rot, transition_t)

	if transition_t >= 1.0:
		is_transitioning = false
		current_cam_pos = target_cam_pos
		current_cam_rot = target_cam_rot

# 3. 获取当前帝国的详情数据
func get_selected_empire_info() -> Dictionary:
	return CAMERA_PRESETS.get(selected_empire, {})

# 4. 确认抉择帝国阵营并过渡到选角界面
func confirm_empire_selection() -> Dictionary:
	var info := get_selected_empire_info()
	return {
		"success": true,
		"empire_id": selected_empire,
		"empire_name": info.get("name", ""),
		"capital": info.get("capital", ""),
		"next_phase": "CHARACTER_SELECT"
	}