//! Keeps information about currently loaded world, like temperature
class WorldData
{
	const float SPAWN_CHANCE_CHOLERA_DEF = 50;
	const float COLD_AREA_TOOL_DMG_MODIF_DEF = 1;
	
	//! directly accesible (defined/overriden in Init())
	float m_TemperaturePerHeightReductionModifier; 	//! amount of °C reduced for each 100 meteres of height above water level
	float m_CloudsTemperatureEffectModifier; 		//! how many % of environment temperature can be lowered by clouds
	float m_TemperatureInsideBuildingsModifier
	float m_WaterContactTemperatureModifier

	protected float SUDDENCHANGE_TIME_MULTIPLIER 	= 0.2;
	protected float SUDDENCHANGE_LENGTH_MULTIPLIER 	= 0.4;
	protected float WIND_MAGNITUDE_TIME_MULTIPLIER 	= 0.1;
	protected float WIND_DIRECTION_TIME_MULTIPLIER 	= 0.05;
	
	protected Weather m_Weather;
	protected float m_EnvironmentTemperature;
	protected bool m_EnTempUpdated;
	protected float m_Timer;
	protected float	m_MaxTemps[12];
	protected float m_MinTemps[12];
	protected float m_Sunrise_Jan;
	protected float m_Sunset_Jan;
	protected float m_Sunrise_Jul;
	protected float m_Sunset_Jul;
	protected ref array<vector> m_FiringPos; // Where we should fire from. On Init set the relevant data
	protected bool m_Pollution;
	protected ref CatchYieldBank m_YieldBank;
	protected ref WorldDataWeatherSettings m_WeatherDefaultSettings;
	protected ref WorldDataLiquidSettings m_LiquidSettings;
	protected ref TStringArray m_DefaultPlayerRestrictedAreas;

	//! weather related
	protected int m_BadWeatherChance;
	protected int m_ClearWeatherChance;
	protected bool m_IsSuddenChange;
	protected float m_WorldWindCoef;

	protected float m_UniversalTemperatureSourceCapModifier;	
	
	//used at next weather calculation
	protected int m_SameWeatherCnt = 0;
	protected int m_StepValue = 5;
	protected int m_Chance = 50;
	protected int m_ChoosenWeather = 1;
	protected int m_LastWeather = 0;
	
	
	void WorldData()
	{
		Init();
		CreateYieldBank();
		InitYieldBank();
		UpdateBaseEnvTemperature(0);
	}
	
	void Init()
	{
		SetupWeatherSettings();
		SetupLiquidTemperatures();

		m_EnTempUpdated = false;
		m_Weather = g_Game.GetWeather();
		m_EnvironmentTemperature = 12.0;
		m_Timer = 0.0;
		m_Sunrise_Jan = 8.54;
		m_Sunset_Jan = 15.52;
		m_Sunrise_Jul = 3.26;
		m_Sunset_Jul = 20.73;
		m_MaxTemps = {3,5,7,14,19,24,26,25,21,16,10,5};
		m_MinTemps = {-3,-2,0,4,9,14,18,17,12,7,4,0};
		m_Pollution = EPollution.NONE;
		m_WorldWindCoef = 0.5;

		m_UniversalTemperatureSourceCapModifier = 0.0;
		
		m_TemperaturePerHeightReductionModifier = 0.02;
		m_CloudsTemperatureEffectModifier 		= 3.0;
		m_TemperatureInsideBuildingsModifier 	= 1.0;
		m_WaterContactTemperatureModifier 		= 20.0;
		
		m_ClearWeatherChance = m_WeatherDefaultSettings.m_ClearWeatherChance;
		m_BadWeatherChance = m_WeatherDefaultSettings.m_BadWeatherChance;
		
		m_DefaultPlayerRestrictedAreas = {};
	}

	float GetApproxSunriseTime( float monthday )
	{
		if ( monthday <= 8.0 )
			return ( ( m_Sunrise_Jan - m_Sunrise_Jul ) / ( 8 - 1 ) ) * ( 1 - monthday ) + m_Sunrise_Jan;
		else
			return ( ( ( monthday - 8 ) * ( m_Sunrise_Jan - m_Sunrise_Jul ) ) / ( 13 - 8 ) ) + m_Sunrise_Jul;
	}
	float GetApproxSunsetTime( float monthday )
	{
		if ( monthday <= 8.0 )
			return ( ( m_Sunset_Jan - m_Sunset_Jul ) / (8 - 1) ) * ( 1 - monthday ) + m_Sunset_Jan;
		else
			return ( ( ( monthday - 8 ) * ( m_Sunset_Jan - m_Sunset_Jul ) ) / ( 13 - 8 ) ) + m_Sunset_Jul;
	}

	int GetDaytime()
	{
		int year, month, day, hour, minute;
		GetGame().GetWorld().GetDate(year, month, day, hour, minute);

		float sunriseTimeStart = g_Game.GetMission().GetWorldData().GetApproxSunriseTime(month);
		float sunsetTimeStart = g_Game.GetMission().GetWorldData().GetApproxSunsetTime(month);

		if (hour >= sunriseTimeStart && hour < (sunriseTimeStart + 2))
			return WorldDataDaytime.DAWN;
		else if (hour >= (sunriseTimeStart + 2) && hour < sunsetTimeStart)
			return WorldDataDaytime.DAY;
		else if (hour >= sunsetTimeStart && hour < (sunsetTimeStart + 2))
			return WorldDataDaytime.DUSK;
			
		return WorldDataDaytime.NIGHT;
	}

	protected float CalcBaseEnvironmentTemperature( float monthday, float daytime )
	{
		float approxSunrise = GetApproxSunriseTime( monthday );
		float approxSunset = GetApproxSunsetTime( monthday );
		float dayLight = approxSunset - approxSunrise;
		float nightTime = 24.0 - dayLight;
		int tempArrayIndex = Math.Floor(monthday) - 1;
		int tempArrayIndexToLerp = tempArrayIndex + 1;
		if ( tempArrayIndexToLerp >= 12 )
			tempArrayIndexToLerp = 0;
		float tempArrayLerp = monthday - Math.Floor(monthday);
		float minTempA = m_MinTemps[tempArrayIndex];
		float minTempB = m_MinTemps[tempArrayIndexToLerp];
		float maxTempA = m_MaxTemps[tempArrayIndex];
		float maxTempB = m_MaxTemps[tempArrayIndexToLerp];
		float eveningMinA = minTempA + ( 0.5 * Math.AbsFloat( minTempA - maxTempA ) );
		float eveningMinB = minTempB + ( 0.5 * Math.AbsFloat( minTempB - maxTempB ) );

		if ( ( daytime >= approxSunrise ) && ( daytime <= approxSunset ) ) {
			if ( daytime <= ( approxSunrise + ( dayLight * 0.75 ) ) )
				return Math.Lerp(
					Math.Lerp( minTempA, minTempB, tempArrayLerp ),
					Math.Lerp( maxTempA, maxTempB, tempArrayLerp ),
					( ( daytime - approxSunrise ) / ( dayLight * 0.75 ) ) );
			else
				return Math.Lerp(
					Math.Lerp( maxTempA, maxTempB, tempArrayLerp ),
					Math.Lerp( eveningMinA, eveningMinB, tempArrayLerp ),
					( ( ( daytime - approxSunrise ) - ( dayLight * 0.75 ) ) / ( dayLight - ( dayLight * 0.75 ) ) ) );
		} else {
			if ( ( daytime > approxSunset ) && ( daytime < 24 ) )
				return Math.Lerp(
					Math.Lerp( eveningMinA, eveningMinB, tempArrayLerp ),
					Math.Lerp( minTempA, minTempB, tempArrayLerp ),
					( ( daytime - approxSunset ) / ( 24 - approxSunset ) ) / 2.0 );
			else
				return Math.Lerp(
					Math.Lerp( eveningMinA, eveningMinB, tempArrayLerp ),
					Math.Lerp( minTempA, minTempB, tempArrayLerp ),
					( ( ( daytime + ( 24 - approxSunset ) ) / nightTime ) / 2.0 ) + 0.5 );
		}
	}
	void UpdateBaseEnvTemperature(float timeslice)
	{
		m_Timer += timeslice;
		if (m_Timer > 30 || !m_EnTempUpdated)
		{
			int year, month, day, hour, minute;
			GetGame().GetWorld().GetDate( year, month, day, hour, minute );
			m_EnvironmentTemperature = CalcBaseEnvironmentTemperature( month + ( day / 32.0 ), hour + ( minute / 60.0 ) );
			m_Timer = 0;
			
			if (!m_EnTempUpdated)
				m_EnTempUpdated = true;
		}
	}
	
	/*!
		\brief Updates *local* weather effects.
		\param weather Weather instance
		\param timeslice Time delta since last update
	*/
	void UpdateWeatherEffects( Weather weather, float timeslice )
	{
		float snowflakeScale = ComputeSnowflakeScale( weather );
		weather.SetSnowflakeScale( snowflakeScale );
	}
	
	/*!
		\brief Returns the desired snowflake scale based on weather simulation state.
		\param weather Weather instance
	*/
	float ComputeSnowflakeScale( Weather weather )
	{
		float overcast01 = Math.Clamp( Math.InverseLerp( 0.4, 1.0, weather.GetOvercast().GetActual() ), 0.0, 1.0 );  // remap range to <0.4, 1.0> snowfall overcast threshold
		float wind01 = weather.GetWindSpeed() / weather.GetWindMaximumSpeed();
		
		float overcastScale = Math.Lerp( 0.50, 1.25, overcast01 );
		float windScale     = Math.Lerp( 1.25, 1.00, wind01 );
		
		return Math.Clamp( overcastScale * windScale, 0.50, 1.25 );
	}

	// getter for the new base enviro temperature
	float GetBaseEnvTemperature()
	{
		return m_EnvironmentTemperature;
	}
	
	float GetBaseEnvTemperatureAtObject(notnull Object object)
	{
		return GetBaseEnvTemperatureAtPosition(object.GetPosition());
	}
	
	float GetBaseEnvTemperatureAtPosition(vector pos)
	{
		float terrainHeight = pos[1];
		float heightCorrection = Math.Max(0, (terrainHeight * m_TemperaturePerHeightReductionModifier));
		return m_EnvironmentTemperature - heightCorrection;
	}

	float GetBaseEnvTemperatureExact(int month, int day, int hour, int minute)
	{
		return CalcBaseEnvironmentTemperature( month + ( day / 32.0 ), hour + ( minute / 60.0 ) );
	}

	float GetLiquidTypeEnviroTemperature(int liquidType)
	{
		if (m_LiquidSettings.m_Temperatures.Count() > 0 && m_LiquidSettings.m_Temperatures.Contains(liquidType) != INDEX_NOT_FOUND)
			return m_LiquidSettings.m_Temperatures.Get(liquidType);
		
		#ifdef DEVELOPER
		ErrorEx("Undefined enviro temperature for liquid type: " + liquidType);
		#endif
		
		return m_EnvironmentTemperature;
	}

	bool WeatherOnBeforeChange( EWeatherPhenomenon type, float actual, float change, float time )
	{
		// default behaviour is same like setting MissionWeather (in Weather) to true
		return false;
	}
	
	// Used to return the artillery firing positions
	array<vector> GetArtyFiringPos()
	{
		return m_FiringPos;
	}
	
	// Returns chance percentage for selected agent to spawn, used with spawned loot
	float GetAgentSpawnChance(eAgents agent)
	{
		if (agent == eAgents.CHOLERA)
			return SPAWN_CHANCE_CHOLERA_DEF;
		
		return 0;
	}
	
	// Returns modifier which is added to the tool damage logic when player is in cold area
	float GetColdAreaToolDamageModifier()
	{
		return COLD_AREA_TOOL_DMG_MODIF_DEF;
	}

	// debug
	void BaseTempDebug(int month, int day)
	{
		Print("--------------------");
		for ( int i = 0; i < 24; i++ )
		{
			for ( int j = 0; j < 6; j++ )
			{
				int minute = ( j * 10 );
				Print(string.Format( "%1:%2      %3", i, minute, GetBaseEnvTemperatureExact( month, day, i, minute ) ) );
			}
		}
	}
	
	int GetPollution()
	{
		return m_Pollution;
	}
	
	float GetWindCoef()
	{
		return m_WorldWindCoef;
	}
	
	float GetUniversalTemperatureSourceCapModifier()
	{
		return m_UniversalTemperatureSourceCapModifier;
	}
	
	protected void CalculateWind(int newWeather, bool suddenChange, out float magnitude, out float direction);
	
	protected void CalculateVolFog(float lerpValue, float windMagnitude, float changeTime);
	
	protected void CreateYieldBank()
	{
		m_YieldBank = new CatchYieldBank();
	}
	
	//! override this to properly register world-specific yields
	protected void InitYieldBank()
	{
		GetDayZGame().GetYieldDataInitInvoker().Invoke(m_YieldBank); //injects defaults from 4_World and above
	}
	
	protected void SetupWeatherSettings()
	{
		m_WeatherDefaultSettings = new WorldDataWeatherSettings();
	}
	
	protected void SetupLiquidTemperatures()
	{
		m_LiquidSettings = new WorldDataLiquidSettings();
		
		m_LiquidSettings.m_Temperatures[LIQUID_SALTWATER] 	= 23.0;
		m_LiquidSettings.m_Temperatures[LIQUID_WATER] 		= 15.0;
		m_LiquidSettings.m_Temperatures[LIQUID_STILLWATER] 	= 15.0;
		m_LiquidSettings.m_Temperatures[LIQUID_RIVERWATER] 	= 15.0;
		m_LiquidSettings.m_Temperatures[LIQUID_FRESHWATER] 	= 15.0;
		m_LiquidSettings.m_Temperatures[LIQUID_CLEANWATER] 	= 10.0;
		m_LiquidSettings.m_Temperatures[LIQUID_SNOW] 		= -5.0;
	}
	
	CatchYieldBank GetCatchYieldBank()
	{
		return m_YieldBank;
	}
	
	TStringArray GetDefaultPRAPaths()
	{
		return m_DefaultPlayerRestrictedAreas;
	}


	//!
	//! DEPRECATED
	//!
	
	protected float m_DayTemperature 	= 10;	// legacy, no longer used
	protected float m_NightTemperature	= 6;	// legacy, no longer used

	float GetDayTemperature()
	{
		return m_DayTemperature;
	}

	float GetNightTemperature()
	{
		return m_NightTemperature;
	}
}

class WorldDataWeatherConstants
{
	const int CLEAR_WEATHER 	= 1;
	const int CLOUDY_WEATHER 	= 2;
	const int BAD_WEATHER 		= 3;
}

class WorldDataWeatherSettings
{
	int m_OvercastMinTime	= 600;
	int m_OvercastMaxTime 	= 900;
	int m_OvercastMinLength = 600;
	int m_OvercastMaxLength = 900;
	
	float m_RainThreshold 	= 0.6;
	int m_RainTimeMin 		= 60;
	int m_RainTimeMax 		= 120;
	int m_RainLengthMin 	= 60;
	int m_RainLengthMax 	= 120;
	
	float m_StormThreshold 			= 0.85;
	float m_ThundersnowThreshold 	= 0.98;
	
	float m_SnowfallThreshold 	= 0.3;
	int m_SnowfallTimeMin 		= 60;
	int m_SnowfallTimeMax 		= 120;
	int m_SnowfallLengthMin 	= 150;
	int m_SnowfallLengthMax 	= 300;

	int m_GlobalSuddenChance		= 95;
	int m_ClearWeatherChance 		= 30;
	int m_BadWeatherChance 			= 80;
	int m_BadWeatherSuddenChance 	= 95;
		
	int m_FoggyMorningHeigthBiasLowLimit = 155;
	int m_DefaultHeigthBias = 170;
	
	int m_CalmAfterStormTimeMin = 480;
	int m_CalmAfterStormTimeMax = 600;
}

class WorldDataLiquidSettings
{
	ref map<int, float> m_Temperatures = new map<int, float>();
}

class WorldDataDaytime
{
	static int ANY		= -1;
	static int NIGHT 	= 0;
	static int DAY 		= 1;
	static int DUSK		= 2;
	static int DAWN		= 3;
	
	static string ToString(int value)
	{
		switch (value)
		{
			case NIGHT:
				return "NIGHT";
			case DAY:
				return "DAY";
			case DUSK:
				return "DUSK";
			case DAWN:
				return "DAWN";
		}
		
		return "ANYTIME";
	}
}