# weather_daynight_system.gd —— Metin2 40250 单机本地天候昼夜交替与地图环境特效系统 1:1
# 对照 40250 客户端 PythonBackground.cpp, game.py, environment.h
class_name WeatherDayNightSystem
extends RefCounted

signal phase_changed(old_phase: String, new_phase: String)
signal weather_changed(old_weather: String, new_weather: String)
signal lighting_updated(sun_color: Color, sun_energy: float, ambient_color: Color, fog_density: float)

const PHASE_DAWN := "dawn"   # 黎明晨曦 (05:00 ~ 08:00)
const PHASE_NOON := "noon"   # 正午晴空 (08:00 ~ 17:00)
const PHASE_DUSK := "dusk"   # 黄昏落日 (17:00 ~ 20:00)
const PHASE_NIGHT := "night" # 寂静黑夜 (20:00 ~ 05:00)

const WEATHER_CLEAR := "clear"         # 晴朗明净
const WEATHER_RAIN := "rain"           # 潇潇细雨
const WEATHER_SNOW := "snow"           # 冰山暴雪 (Mount Sohan)
const WEATHER_SANDSTORM := "sandstorm" # 狂沙飞舞 (Yongbi Desert)
const WEATHER_CINDERS := "cinders"     # 烈焰余烬 (Doyyumhwan)

const SECONDS_PER_DAY: float = 86400.0
const DEFAULT_TIME_SCALE: float = 60.0 # 默认 1 秒流逝 60 秒游戏时间 (24 分钟一昼夜)

const MAP_DEFAULT_WEATHER: Dictionary = {
	"village": WEATHER_CLEAR,
	"sohan": WEATHER_SNOW,
	"desert": WEATHER_SANDSTORM,
	"flame": WEATHER_CINDERS,
	"temple": WEATHER_CLEAR,
	"catacomb": WEATHER_CLEAR
}

var time_of_day: float = 43200.0 # 默认正午 12:00:00 (12 * 3600)
var time_scale: float = DEFAULT_TIME_SCALE
var is_frozen: bool = false

var current_phase: String = PHASE_NOON
var current_weather: String = WEATHER_CLEAR
var current_map: String = "village"

# 光影参数
var sun_color: Color = Color(1.0, 0.98, 0.9)
var sun_energy: float = 1.2
var ambient_color: Color = Color(0.9, 0.9, 0.95)
var fog_density: float = 0.001

func _init() -> void:
	_update_phase_and_lighting()

# 帧心跳更新天候流逝
func update(delta: float) -> void:
	if not is_frozen:
		time_of_day = fmod(time_of_day + delta * time_scale, SECONDS_PER_DAY)
		if time_of_day < 0.0:
			time_of_day += SECONDS_PER_DAY

	_update_phase_and_lighting()

# 手动设置指定时间 (小时 0~24，分钟 0~60)
func set_time_of_day(hour: float, minute: float = 0.0) -> void:
	var clamped_h = clampf(hour, 0.0, 23.99)
	var clamped_m = clampf(minute, 0.0, 59.99)
	time_of_day = clamped_h * 3600.0 + clamped_m * 60.0
	_update_phase_and_lighting()

# 直接快速切换至指定时相
func set_phase(target_phase: String) -> void:
	match target_phase:
		PHASE_DAWN:
			set_time_of_day(6.0, 0.0)
		PHASE_NOON:
			set_time_of_day(12.0, 0.0)
		PHASE_DUSK:
			set_time_of_day(18.5, 0.0)
		PHASE_NIGHT:
			set_time_of_day(23.0, 0.0)

# 设置天气模式
func set_weather(weather_type: String) -> Dictionary:
	var valid_weathers = [WEATHER_CLEAR, WEATHER_RAIN, WEATHER_SNOW, WEATHER_SANDSTORM, WEATHER_CINDERS]
	if not (weather_type in valid_weathers):
		return {"ok": false, "reason": "INVALID_WEATHER_TYPE"}

	if current_weather != weather_type:
		var old = current_weather
		current_weather = weather_type
		weather_changed.emit(old, weather_type)

	_update_phase_and_lighting()
	return {"ok": true, "weather": current_weather}

# 设置当前地图并自动匹配环境天气
func set_map_environment(map_name: String) -> void:
	current_map = map_name
	var def_weather = MAP_DEFAULT_WEATHER.get(map_name, WEATHER_CLEAR)
	set_weather(def_weather)

# 核心昼夜时相与光照参数计算
func _update_phase_and_lighting() -> void:
	var hours = time_of_day / 3600.0
	var new_phase = PHASE_NOON

	if hours >= 5.0 and hours < 8.0:
		new_phase = PHASE_DAWN
		sun_color = Color(1.0, 0.8, 0.6) # 晨曦暖金
		sun_energy = 0.75
		ambient_color = Color(0.85, 0.75, 0.65)
		fog_density = 0.002
	elif hours >= 8.0 and hours < 17.0:
		new_phase = PHASE_NOON
		sun_color = Color(1.0, 0.98, 0.92) # 正午白炽日光
		sun_energy = 1.2
		ambient_color = Color(0.9, 0.9, 0.95)
		fog_density = 0.001
	elif hours >= 17.0 and hours < 20.0:
		new_phase = PHASE_DUSK
		sun_color = Color(0.95, 0.45, 0.3) # 晚霞橙红
		sun_energy = 0.65
		ambient_color = Color(0.7, 0.45, 0.4)
		fog_density = 0.003
	else:
		new_phase = PHASE_NIGHT
		sun_color = Color(0.3, 0.4, 0.7) # 冷冽月光
		sun_energy = 0.25
		ambient_color = Color(0.15, 0.2, 0.35)
		fog_density = 0.004

	# 天气修正
	match current_weather:
		WEATHER_RAIN:
			sun_energy *= 0.6
			fog_density += 0.003
		WEATHER_SNOW:
			sun_color = sun_color.lerp(Color(0.85, 0.9, 1.0), 0.5)
			fog_density += 0.002
		WEATHER_SANDSTORM:
			sun_color = sun_color.lerp(Color(0.85, 0.7, 0.4), 0.6)
			fog_density += 0.008
		WEATHER_CINDERS:
			sun_color = sun_color.lerp(Color(1.0, 0.35, 0.2), 0.5)
			fog_density += 0.004

	if current_phase != new_phase:
		var old = current_phase
		current_phase = new_phase
		phase_changed.emit(old, new_phase)

	lighting_updated.emit(sun_color, sun_energy, ambient_color, fog_density)

# 获取格式化时间字符串 "HH:MM:SS"
func get_time_string() -> String:
	var total_sec = int(time_of_day)
	var h = int(total_sec / 3600)
	var m = int((total_sec % 3600) / 60)
	var s = total_sec % 60
	return "%02d:%02d:%02d" % [h, m, s]

# 获取当前光照参数字典
func get_current_lighting() -> Dictionary:
	return {
		"phase": current_phase,
		"weather": current_weather,
		"time_string": get_time_string(),
		"sun_color": sun_color,
		"sun_energy": sun_energy,
		"ambient_color": ambient_color,
		"fog_density": fog_density
	}