#include "todolist.hpp"

#include "task.hpp"

namespace todo
{

  ToDoList::ToDoList()
  {
    completedCount = 0;
    incompleteCount = 0;
  }

  void ToDoList::add(const Task& t)
  {
    if (incompleteCount + completedCount < MAX_TASKS)
      {
	todo[incompleteCount] = t;
	incompleteCount++;
      }
  }

  bool ToDoList::isIncomplete() const
  {
    return (incompleteCount > 0);
  }

  Task ToDoList::getNext() const
  {
    if (incompleteCount > 0)
      {
	return todo[0];
      }
    else
      {
	throw std::logic_error{"no incomplete tasks"};
      }
  }

  void ToDoList::completeNext()
  {
    if (incompleteCount > 0)
      {
	// mark completed
	todo[0].complete();

	// move to list of completed
	completed[completedCount] = todo[0];
	completedCount++;

	// shift incomplete tasks back
	incompleteCount--;
	for (int i = 0; i < incompleteCount; i++)
	  {
	    todo[i] = todo[i + 1];
	  }
      }
  }

  void ToDoList::delayNext()
  {
    if (incompleteCount >= 2)
      {
	Task delayed = todo[0];
	todo[0] = todo[1];
	todo[1] = delayed;
      }
  }

  void ToDoList::postponeNext()
  {
    if (incompleteCount >= 2)
      {
	Task postponed = todo[0];
	for (int i = 0; i < incompleteCount - 1; i++)
	  {
	    todo[i] = todo[i + 1];
	  }
	todo[incompleteCount - 1] = postponed;
      }
  }

  int ToDoList::timeRemaining() const
  {
    int tot = 0;

    for (int i = 0; i < incompleteCount; i++)
      {
	tot += todo[i].time();
      }

    return tot;
  }
  
  int ToDoList::remainingTasks() const
  {
    return incompleteCount;
  }

  ToDoList ToDoList::makeDrinkTasks(const std::string& drink)
  {
    ToDoList drinkTasks{};

    Task makeTask(std::string("make ") + drink, 5);
    Task drinkTask(std::string("drink ") + drink, 90);

    drinkTasks.add(makeTask);
    drinkTasks.add(drinkTask);
    
    return drinkTasks;
  }    
}