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/* CaptureOdds.h
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.
You should have received a copy of the GNU General Public License along with
this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <vector>
class Ship;
// This class stores the odds that one ship will be able to capture another, and
// can report the odds for any number of crew up to what each ship starts out
// with (because the odds change each time a crew member is lost). If either
// ship has hand-to-hand weapons available, the crew members will make use of
// them starting with whatever weapon is most useful to them. In each round of
// combat, one ship will lose one crew member. Which ship loses depends on the
// ratio of the strengths of the two crews (plus weapons), and whether each crew
// is attacking or defending; defending crew get a +1 power bonus.
class CaptureOdds {
public:
// Calculate odds that the first given ship can capture the second, assuming
// the first ship always attacks and the second one always defends.
CaptureOdds(const Ship &attacker, const Ship &defender);
// Get the odds of the attacker winning if the two ships have the given
// number of crew members remaining.
double Odds(int attackingCrew, int defendingCrew) const;
// Get the expected number of casualties in the remainder of the battle if
// the two ships have the given number of crew remaining.
double AttackerCasualties(int attackingCrew, int defendingCrew) const;
double DefenderCasualties(int attackingCrew, int defendingCrew) const;
// Get the total power (inherent crew power plus bonuses from hand to hand
// weapons) for each ship when they have the given number of crew remaining.
double AttackerPower(int attackingCrew) const;
double DefenderPower(int defendingCrew) const;
private:
// Generate the lookup table.
void Calculate();
// Map crew numbers into an index in the lookup table.
int Index(int attackingCrew, int defendingCrew) const;
// Calculate attack or defense power for each number of crew members up to
// the given ship's full complement.
static std::vector<double> Power(const Ship &ship, bool isDefender);
private:
// Attacker and defender power lookup tables.
std::vector<double> powerA;
std::vector<double> powerD;
// Capture odds lookup table.
std::vector<double> capture;
// Expected casualties lookup table.
std::vector<double> casualtiesA;
std::vector<double> casualtiesD;
};
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