// A radio's category is protected in the stock gadget component.
modded class SCR_RadioComponent
{
	bool ERR_IsHQManpack()
	{
		return m_iRadioCategory == ERadioCategory.MANPACK;
	}
}

class ERR_HQRadio
{
	// 0: no radio, 1: basic radio, 2: manpack. Inventory is checked live.
	static int Capability(IEntity character)
	{
		if (!ERR_Actors.CanFight(character))
			return 0;
		InventoryStorageManagerComponent inventory = InventoryStorageManagerComponent.Cast(character.FindComponent(InventoryStorageManagerComponent));
		if (!inventory)
			return 0;
		array<IEntity> items = {};
		inventory.GetItems(items);
		int result;
		foreach (IEntity item : items)
		{
			if (!item || !item.FindComponent(BaseRadioComponent))
				continue;
			result = 1;
			SCR_RadioComponent gadget = SCR_RadioComponent.Cast(item.FindComponent(SCR_RadioComponent));
			if (gadget && gadget.ERR_IsHQManpack())
				return 2;
		}
		return result;
	}
}

// HQ uses entity identity only for matching observations, never for its origin.
// Visible details are captured at intake and copied as scalar snapshots.
// Reports and orders contain immutable observed coordinates and timestamps.
class ERR_HQReport
{
	int MessageId;
	IEntity Target;
	SCR_AIGroup Source;
	vector Position;
	vector Velocity;
	float ObservedAt = -1;
	float LastSent = -60000;
	float PerceptionStamp = -1;
	bool HasVelocity;
	bool Engaged;
	bool Distress;
	int SeenEscapists = -1;
	string TravelMode = "unknown";
	string SeenWeapons = "unknown";
	float DetailsObservedAt = -1;

	ERR_HQReport Snapshot()
	{
		ERR_HQReport copy = new ERR_HQReport();
		copy.MessageId = MessageId;
		copy.Target = Target;
		copy.Source = Source;
		copy.Position = Position;
		copy.Velocity = Velocity;
		copy.ObservedAt = ObservedAt;
		copy.Engaged = Engaged;
		copy.Distress = Distress;
		copy.HasVelocity = HasVelocity;
		copy.SeenEscapists = SeenEscapists;
		copy.TravelMode = TravelMode;
		copy.SeenWeapons = SeenWeapons;
		copy.DetailsObservedAt = DetailsObservedAt;
		return copy;
	}

	string TravelDirection()
	{
		if (!HasVelocity)
			return "unknown";
		if (Velocity.Length() < 0.5)
			return "stationary";
		float x = Math.AbsFloat(Velocity[0]);
		float z = Math.AbsFloat(Velocity[2]);
		string northSouth = "N";
		string eastWest = "E";
		if (Velocity[2] < 0)
			northSouth = "S";
		if (Velocity[0] < 0)
			eastWest = "W";
		if (x < z * 0.414214)
			return northSouth;
		if (z < x * 0.414214)
			return eastWest;
		return northSouth + eastWest;
	}

	string Description(float now, bool brief = false)
	{
		if (Distress)
			return string.Format("Distress at friendly X=%1 Z=%2; enemy details unknown (%3s ago)", Math.Round(Position[0]), Math.Round(Position[2]), Math.Round(Math.Max(0, now - ObservedAt) / 1000));
		string count = "count unknown";
		if (SeenEscapists >= 0)
			count = "at least " + SeenEscapists.ToString() + " spotted nearby";
		string motion = "speed/direction unknown";
		if (HasVelocity)
		{
			float speed = Math.Round(Velocity.Length() * 10) / 10.0;
			float azimuth = Math.Atan2(Velocity[0], Velocity[2]) * Math.RAD2DEG;
			if (azimuth < 0)
				azimuth += 360;
			int heading = Math.Round(azimuth);
			motion = string.Format("%1 km/h, azimuth %2 degrees (%3)", Math.Round(speed * 3.6), heading % 360, TravelDirection());
		}
		string details = count + "; " + TravelMode + "; " + motion + "; seen weapons: " + SeenWeapons;
		if (brief)
			return details;
		string velocity = "unknown";
		if (HasVelocity)
			velocity = string.Format("[%1,%2] m/s", Math.Round(Velocity[0] * 10) / 10.0, Math.Round(Velocity[2] * 10) / 10.0);
		return string.Format("X=%1 Z=%2: %3; vector X/Z=%4 (%5s ago)", Math.Round(Position[0]), Math.Round(Position[2]), details, velocity, Math.Round(Math.Max(0, now - ObservedAt) / 1000));
	}

	static vector Predict(vector position, vector velocity, float seconds)
	{
		vector offset = velocity * Math.Clamp(seconds, 0, 20);
		offset[1] = 0;
		if (offset.Length() > 300)
			offset = offset.Normalized() * 300;
		return position + offset;
	}

	int Priority(float now)
	{
		if (Distress)
			return 0;
		if (now - ObservedAt <= 15000)
		{
			if (Engaged)
				return 3;
			return 2;
		}
		return 1;
	}
}