#include <algorithm>
#include <chrono>
#include <cstdio>
#include <ctime>
#include <functional>
#include <iostream>
#include <memory>
#include <ncurses.h>
#include <string>
#include <thread>
#include <unistd.h>
#include <vector>

/*
  todo
  figure out namespaces, using, and auto
  formalize timer struct
  read about std function and std bind
  try to do with objects / classes instead
  centralize into event sender and subscriber
*/

/*
  find a way to eject timer
  find a way to group timers into an object
*/

struct mysecondsdisplay {
  int intervalcount = 10;
  void myupdatedisplay() {
    intervalcount -= 1;
    mvprintw(intervalcount, intervalcount, "hello %d", intervalcount);
    if (intervalcount < 1) {
      intervalcount = 10;
    }
  }
};

// calls callbackfunc on specified interval based on accumulated deltatime
class timer {
public:
  std::string name;
  std::function<void()> callbackfunc;

  timer(std::string name, size_t interval_input, std::function<void()> callback)
      : name(name), callbackfunc(callback), time_interval(interval_input) {}

  // callbackfunc once enough time has accumulated
  void updatetime(double DeltaTime) {
    accumulator += DeltaTime;
    if (accumulator >= time_interval) {
      accumulator -= time_interval;
      callbackfunc();
    }
  }

private:
  double accumulator = 0;
  double time_interval = 1; // only display every 1 seconds
};

// manage collection of timers
class timermanager {
  std::vector<std::unique_ptr<timer>> timers;

public:
  void addtimer(std::unique_ptr<timer> input_timer) {
    timers.push_back(std::move(input_timer)); }

  void updatetimers(double dtime) {
    for (auto &mytimer : timers) {
      mytimer->updatetime(dtime);
      mvprintw(12, 0, "updated timer %s", mytimer->name.c_str());
    };
    refresh();
  }
};

int main() {
  initscr();
  nodelay(stdscr, FALSE);
  refresh();
  // printf("verification\n");

  auto starttime = std::chrono::system_clock::now(); // initial starttime
  mysecondsdisplay secdisp;
  auto clocktimer = std::make_unique<timer>("secondsprinter", 1, [&]() { secdisp.myupdatedisplay(); });
  timermanager mytimermanager;  
  mytimermanager.addtimer(std::move(clocktimer));
  
  mvprintw(5, 5, "timer added");
  // calculate delta between current and previous time
  while (true) {
    auto currenttime = std::chrono::system_clock::now();
    std::chrono::duration<double> myDeltaTime = currenttime - starttime;
    double dtime = myDeltaTime.count();
    // mvprintw(11, 11, "dtime: %f", dtime);
    //  clocktimer.updatetime(dtime);
    mytimermanager.updatetimers(dtime);

    starttime = currenttime;
    std::this_thread::sleep_for(std::chrono::milliseconds(500));
  }

  getch();
  endwin();

  return 0;
}