//===========================================================================//
// File:	misthrst.cpp                                                        //
// Project: BattleTech           Brick: Mech weapons                          //
// Contents: MissileThruster -- the missile's propulsion subsystem           //
//---------------------------------------------------------------------------//
// Copyright (C) 1995, Virtual World Entertainment, Inc.                     //
// All Rights reserved worldwide                                             //
// This unpublished sourcecode is PROPRIETARY and CONFIDENTIAL               //
//===========================================================================//
//
// The class interface is the AUTHENTIC surviving CODE/BT/BT/MISTHRST.HPP.
// Bodies reconstructed via the BT411 decomp (ctor @004be7c4).  The Subsystem
// base chain is the NAME ctor with the shipped string "MissleThruster"
// @00512e25 (the 1995 misspelling is AUTHENTIC -- keep it).  No streamed
// resource in the pod content: the flight envelope defaults below are
// STAGED until the missile GameModel record decode (see MISSILE.NOTES.md).
//

#include <bt.hpp>
#pragma hdrstop

#if !defined(MISTHRST_HPP)
#	include <misthrst.hpp>
#endif

#if !defined(MISSILE_HPP)
#	include <missile.hpp>
#endif

//
// STAGED-DEFAULT burn envelope (a believable SRM: short hard burn).
//
static const Scalar DefaultBurnTime					= 2.0f;
static const Scalar DefaultThrusterAcceleration		= 120.0f;	// u/s^2
static const Scalar DefaultThrusterClimb			= 0.0f;

Derivation
	MissileThruster::ClassDerivations(
		Subsystem::ClassDerivations,
		"MissileThruster"
	);

const MissileThruster::IndexEntry
	MissileThruster::AttributePointers[] =
{
	ATTRIBUTE_ENTRY(MissileThruster, BurnTimeRemaining,		burnTimeRemaining),
	ATTRIBUTE_ENTRY(MissileThruster, MaxThrusterRotationRate,	maxThrusterRotationRate),
	ATTRIBUTE_ENTRY(MissileThruster, ThrusterAcceleration,		thrusterAcceleration)
};

MissileThruster::AttributeIndexSet
	MissileThruster::AttributeIndex(
		ELEMENTS(MissileThruster::AttributePointers),
		MissileThruster::AttributePointers,
		Subsystem::AttributeIndex
	);

MissileThruster::SharedData
	MissileThruster::DefaultData(
		MissileThruster::ClassDerivations,
		Subsystem::MessageHandlers,
		MissileThruster::AttributeIndex,
		MissileThruster::StateCount
	);

//
//#############################################################################
// Construction (binary @004be7c4).  The const burn/thrust envelope streams
// from the missile resource in the binary; staged defaults here.
//#############################################################################
//
MissileThruster::MissileThruster(
	Missile				*owner,
	int					subsystem_ID,
	SubsystemResource	*subsystem_resource
):
	Subsystem(
		owner,
		subsystem_ID,
		"MissleThruster",
		(RegisteredClass::ClassID)ThrusterClassID,
		DefaultData
	),
	thrusterAcceleration(
		(subsystem_resource != NULL)
			? subsystem_resource->thrusterAcceleration
			: DefaultThrusterAcceleration
	),
	thrusterClimb(
		(subsystem_resource != NULL)
			? subsystem_resource->thrusterClimb
			: DefaultThrusterClimb
	)
{
	Check(owner);

	burnTimeRemaining		= (subsystem_resource != NULL)
								? subsystem_resource->burnTime
								: DefaultBurnTime;
	maxThrusterRotationRate	= 0.0f;

	Check_Fpu();
}

MissileThruster::~MissileThruster()
{
}

Logical
	MissileThruster::TestInstance() const
{
	return IsDerivedFrom(ClassDerivations);
}

//
//#############################################################################
// MissileThrusterSimulation -- bleed the burn.  (Driven from the Missile's
// MoveAndCollide integrator, not a roster Performance -- the binary folds
// the thruster work into the integrate pass.)
//#############################################################################
//
void
	MissileThruster::MissileThrusterSimulation(Scalar time_slice)
{
	Check(this);

	if (burnTimeRemaining > 0.0f)
	{
		burnTimeRemaining -= time_slice;
		if (burnTimeRemaining < 0.0f)
		{
			burnTimeRemaining = 0.0f;
		}
	}
}