Bowling/src/ScoreCalculator.cpp

#include "../include/ScoreCalculator.h"

int ScoreCalculator::getScore(vector<int> rolls) {
    int score = 0;
    int frame = 0;
    
    while (true) {
        // Strike
        if (rolls[frame] == 10) {
            // If we're on our last frame, and roll a strike, we're given two bonus rolls.
            if (frame + 3 == rolls.size() && rolls[frame - 3] == 10) {
                score += 10 + rolls[frame + 1] + rolls[frame + 2];
                break;
            }
            
            score += 10 + rolls[frame + 1] + rolls[frame + 2];
            frame += 1;
        }
        
        // Spare
        else if (rolls[frame] + rolls[frame + 1] == 10) {
            // If we're on our last frame, and roll a spare, we're given a bonus roll.
            if (frame + 3 == rolls.size() && rolls[frame] + rolls[frame + 1] == 10)
            {
                score += 10 + rolls[frame + 1];
                break;
            }
            
            score += 10 + rolls[frame + 2];
            frame += 2;
        }
        
        // Open Frame
        else {
            score += rolls[frame] + rolls[frame + 1];
            frame += 2;
        }
        
        // No more frames
        if (frame == rolls.size()) {
            break;
        }
    }
    
    return score;
}