/// @file
/// @brief task A
/// compile/run: g++ -g -std=c++20 taskA.cpp -o taskA && ./taskA

/// @todo add debug statements in function findMax
/// @todo compile and run this file, inspect output
/// @todo runtime debug the program and add breakpoints
///   - at the beginning of each function
///   - inside the loops
///   - at the end of each function

#include <iostream>
#include <vector>

// prints a vector to the console
void print(const std::vector<int>& vec) {
  std::cout << "[ ";
  for (int i = 0; i < vec.size(); ++i) {
    std::cout << vec[i] << " ";
  }
  std::cout << "]" << std::endl;
}

// takes an input vector and returns a vector where each element is doubled
std::vector<int> doubleVec(std::vector<int> vec) {
  std::cout << "'doubleVec' input: ";
  print(vec);

  for (int i = 0; i < vec.size(); ++i) {
    vec[i] *= 2;
    std::cout << "   loop(i=" << i << "): " << std::endl;
    std::cout << "   ";
    print(vec);
  }

  std::cout << "'doubleVec' output: ";
  print(vec);
  return vec;
}

// returns the greatest element of a vector
int findMax(const std::vector<int>& vec) {
  int max = vec[0];
  for (int i = 1; i < vec.size(); ++i) {
    std::cout << "   loop(i=" << i << "): " << std::endl;
    std::cout << "   current: " << vec[i] << std::endl;
    if (vec[i] > max) {
      max = vec[i];
      std::cout << "   new max: " << max << std::endl;
    }
  }
  return max;
}

int main() {

  std::vector<int> vec = {3, 7, 12, 9, 15};
  vec = doubleVec(vec);
  int max = findMax(vec);
  std::cout << "max: " << max << std::endl;
  return 0;
}