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/* Armament.cpp
Copyright (c) 2014 by Michael Zahniser
Endless Sky is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later version.
Endless Sky is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.  See the GNU General Public License for more details.
#include "Armament.h"
#include "Command.h"
#include "Files.h"
#include "Outfit.h"
#include "Ship.h"
#include <algorithm>
#include <cmath>
#include <limits>
using namespace std;
// Add a gun hardpoint (fixed-direction weapon).
void Armament::AddGunPort(const Point &point, const Outfit *outfit)
	hardpoints.emplace_back(point, false, outfit);
// Add a turret hardpoint (omnidirectional weapon).
void Armament::AddTurret(const Point &point, const Outfit *outfit)
	hardpoints.emplace_back(point, true, outfit);
// This must be called after all the outfit data is loaded. If you add more
// of a given weapon than there are slots for it, the extras will not fire.
// But, the "gun ports" attribute should keep that from happening.
void Armament::Add(const Outfit *outfit, int count)
	// Make sure this really is a weapon.
	if(!count || !outfit || !outfit->IsWeapon())
	int existing = 0;
	int added = 0;
	bool isTurret = outfit->Get("turret mounts");
	// Do not equip weapons that do not define how they are mounted.
	if(!isTurret && !outfit->Get("gun ports"))
		Files::LogError("Skipping unmountable outfit \"" + outfit->Name() + "\". Weapon outfits must specify either \"gun ports\" or \"turret mounts\".");
	// To start out with, check how many instances of this weapon are already
	// installed. If "adding" a negative number of outfits, remove the installed
	// instances until the given number have been removed.
	for(Hardpoint &hardpoint : hardpoints)
		if(hardpoint.GetOutfit() == outfit)
			// If this slot has the given outfit in it and we need to uninstall
			// some of them, uninstall it. Otherwise, remember the fact that one
			// of these outfits is installed.
			if(count < 0)
				hardpoint.Uninstall();
				++count;
				++existing;
		else if(!hardpoint.GetOutfit() && hardpoint.IsTurret() == isTurret)
			// If this is an empty, compatible slot, and we're adding outfits,
			// install one of them here and decrease the count of how many we
			// have left to install.
			if(count > 0)
				hardpoint.Install(outfit);
				--count;
				++added;
	// If a stream counter already exists for this outfit (because we did not
	// just add the first one or remove the last one), do nothing.
	if(existing)
	// If this weapon is streamed, create a stream counter. If it is not
	// streamed, or if the last of this weapon has been uninstalled, erase the
	// stream counter (if there is one).
	if(added && outfit->IsStreamed())
		streamReload[outfit] = 0;
		streamReload.erase(outfit);
// Call this once all the outfits have been loaded to make sure they are all
// set up properly (even the ones that were pre-assigned to a hardpoint).
void Armament::FinishLoading()
	for(Hardpoint &hardpoint : hardpoints)
		if(hardpoint.GetOutfit())
			hardpoint.Install(hardpoint.GetOutfit());
	ReloadAll();
// Reload all weapons (because a day passed in-game).
void Armament::ReloadAll()
	streamReload.clear();
	for(Hardpoint &hardpoint : hardpoints)
		if(hardpoint.GetOutfit())
			hardpoint.Reload();
			// If this weapon is streamed, create a stream counter.
			const Outfit *outfit = hardpoint.GetOutfit();
			if(outfit->IsStreamed())
				streamReload[outfit] = 0;
// Swap the weapons in the given two hardpoints.
void Armament::Swap(int first, int second)
	// Make sure both of the given indices are in range, and that both slots are
	// the same type (gun vs. turret).
	if(static_cast<unsigned>(first) >= hardpoints.size())
	if(static_cast<unsigned>(second) >= hardpoints.size())
	if(hardpoints[first].IsTurret() != hardpoints[second].IsTurret())
	// Swap the weapons in the two hardpoints.
	const Outfit *outfit = hardpoints[first].GetOutfit();
	hardpoints[first].Install(hardpoints[second].GetOutfit());
	hardpoints[second].Install(outfit);
// Access the array of weapon hardpoints.
const vector<Hardpoint> &Armament::Get() const
	return hardpoints;
// Determine how many fixed gun hardpoints are on this ship.
int Armament::GunCount() const
	return hardpoints.size() - TurretCount();
// Determine how many turret hardpoints are on this ship.
int Armament::TurretCount() const
	int count = 0;
	for(const Hardpoint &hardpoint : hardpoints)
		count += hardpoint.IsTurret();
	return count;
// Adjust the aim of the turrets.
void Armament::Aim(const Command &command)
	for(unsigned i = 0; i < hardpoints.size(); ++i)
		hardpoints[i].Aim(command.Aim(i));
// Fire the given weapon, if it is ready. If it did not fire because it is
// not ready, return false.
void Armament::Fire(int index, Ship &ship, vector<Projectile> &projectiles, vector<Visual> &visuals)
	if(static_cast<unsigned>(index) >= hardpoints.size() || !hardpoints[index].IsReady())
	// A weapon that has already started a burst ignores stream timing.
	if(!hardpoints[index].WasFiring())
		auto it = streamReload.find(hardpoints[index].GetOutfit());
		if(it != streamReload.end())
			if(it->second > 0)
				return;
			it->second += it->first->Reload() * hardpoints[index].BurstRemaining();
	hardpoints[index].Fire(ship, projectiles, visuals);
bool Armament::FireAntiMissile(int index, Ship &ship, const Projectile &projectile, vector<Visual> &visuals)
	if(static_cast<unsigned>(index) >= hardpoints.size() || !hardpoints[index].IsReady())
		return false;
	return hardpoints[index].FireAntiMissile(ship, projectile, visuals);
// Update the reload counters.
void Armament::Step(const Ship &ship)
	for(Hardpoint &hardpoint : hardpoints)
		hardpoint.Step();
	for(auto &it : streamReload)
		int count = ship.OutfitCount(it.first);
		it.second -= count;
		// Always reload to the quickest firing interval.
		it.second = max(it.second, 1 - count);
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