#include "Trivia.h"
#include "NumericQuestion.h"
#include "SingleChoiceQuestion.h"
#include "TextualQuestion.h"

#include <cassert>
#include <ctime>
#include <fstream>
#include <iomanip>
#include <iostream>

Trivia::Trivia()
{
}

Trivia::~Trivia()
{
	for ( size_t index = 0; index < questions.size(); ++index )
		delete questions[index];
}

int Trivia::run()
{
	std::cout << "Welcome to Trivia 1.0..." << std::endl;
	std::srand( std::time(nullptr) );

	if ( ! loadQuestions() )
		return 1;

	while ( askQuestion() )
		showStatistics();

	showFinalStatistics();

	return 0;
}

bool Trivia::loadQuestions()
{
	const std::string filename = "preguntas.txt";
	std::ifstream inputFile(filename);
	if ( ! inputFile )
	{
		std::cerr << "Could not open file " << filename << std::endl;
		return false;
	}

	std::string questionType;
	while ( std::getline(inputFile, questionType) )
	{
		Question* question = createQuestion(questionType);
		if ( question != nullptr )
		{
			inputFile >> *question;
			questions.push_back( question );
		}
		else
		{
			std::cerr << "Error parsing: '" << questionType << "'\n";
			assert(false);
		}
	}

	return true;
}

bool Trivia::askQuestion()
{
/*
	std::cout << questions.size() << " total questions\n";
	for ( size_t index = 0; index < questions.size(); ++index )
		std::cout << "Question " << index + 1 << ":\n" << *questions[index] << std::endl;
*/
	long result = questions[ rand() % questions.size() ]->ask();
	if ( result < 0 )
		return false;

	playerScore += result;
	return true;
}

void Trivia::showStatistics() const
{
	std::cout << "Your score: " << playerScore << std::endl << std::endl;
}

void Trivia::showFinalStatistics() const
{
}

Question* Trivia::createQuestion(const std::string& questionType)
{
	if ( questionType == "numerica" )
		return new NumericQuestion();
	if ( questionType == "seleccion_unica" )
		return new SingleChoiceQuestion();
	if ( questionType == "textual" )
		return new TextualQuestion();

	return nullptr;
}