"use strict";

const ALL_REGIONS = "All Regions";
const FLAG_DIR = "flags";

const answersHTML = document.getElementById("answers");
const answerAHTML = document.getElementById("answer_a");
const answerBHTML = document.getElementById("answer_b");
const answerCHTML = document.getElementById("answer_c");
const answerDHTML = document.getElementById("answer_d");
const bodyHTML = document.getElementsByTagName("body")[0];
const incorrectAnswersTable = document.getElementById("incorrectAnswersTable");
const correctAnswersTable = document.getElementById("correctAnswersTable");
const previousQuestionAnswer = document.getElementById(
  "previousQuestionAnswer"
);
const previousQuestionText = document.getElementById("previousQuestionText");
const regionListHTML = document.getElementById("regionList");
const resultsHTML = document.getElementById("results");
const scoreHTML = document.getElementById("score");
const settingsHTML = document.getElementById("settings");
const questionHTML = document.getElementById("question");
const timeHTML = document.getElementById("time");

var gameTimeStartTime = 0;
var gameTimeIntervalId = 0;
var selectedRegion = null;

const guessCapital = () =>
  document.getElementById("questionTypeCapital").checked;
const guessCountry = () =>
  document.getElementById("questionTypeCountry").checked;
const guessFlag = () => document.getElementById("questionTypeFlag").checked;
const guessReverseFlag = () =>
  document.getElementById("questionTypeReverseFlag").checked;

const updateTime = () => {
  const secondsPassed = (
    (new Date().getTime() - gameTimeStartTime.getTime()) /
    1000
  ).toFixed(3);
  timeHTML.innerHTML = secondsPassed;
};

const getMasterQuestionList = () => {
  return countries;
};

const getQuestionByCountryName = (name) => {
  var c = getMasterQuestionList().filter((c) => c.countryname === name);
  if (c.length > 0) return c[0];
  return null;
};

const getQuestionByCapital = (capital) => {
  var c = getMasterQuestionList().filter((c) => c.capital === capital);
  if (c.length > 0) return c[0];
  return null;
};

const optionToAnswer = (option) => {
  if (guessCapital()) return option.capital;
  else if (guessCountry()) return option.countryname;
  else if (guessReverseFlag()) return option.countryname;
  else return option.code;
};

const optionToAnswerFormatted = (option) => {
  const r = optionToAnswer(option);
  if (guessFlag()) return getImageURLFromCountryCode(r);
  return r;
};

const optionToQuestion = (option) => {
  if (guessCapital()) return option.countryname;
  else if (guessCountry()) return option.capital;
  else if (guessReverseFlag()) return option.code;
  else return option.countryname;
};

const optionToQuestionFormatted = (option) => {
  const r = optionToQuestion(option);
  if (guessReverseFlag()) return getImageURLFromCountryCode(r);
  return r;
};

const getQuestionHTML = (state) => {
  if (guessCountry())
    return `what country is <span id="questionCapital">${state.question.capital}</span> the capital of?`;
  if (guessCapital())
    return `what is the capital of <span id="questionCountry">${state.question.countryname}</span>?`;
  if (guessFlag())
    return `what is the flag of <span id="questionCountry">${state.question.countryname}</span>?`;
  if (guessReverseFlag())
    return `which country's flag is ${getImageURLFromCountryCode(
      state.question.code
    )}?`;
};

const answerList = () => {
  return getMasterQuestionList().map((q) => {
    if (guessCountry()) return q.countryname;
    if (guessCapital()) return q.capital;
    if (guessFlag()) return q.code;
    if (guessReverseFlag()) return q.countryname;
  });
};

const getImageURLFromCountryCode = (code) =>
  `<img src="${FLAG_DIR}/${code}.svg" />`;

const regionList = () =>
  [...new Set(getMasterQuestionList().map((item) => item.region))]
    .concat([...new Set(getMasterQuestionList().map((item) => item.subregion))])
    .concat([ALL_REGIONS])
    .sort();
const date = new Date();

var questionList, state;

var resultsChart = new Chart(document.getElementById("resultsChart"), {
  type: "doughnut",
  data: {
    labels: [],
    datasets: [
      {
        labels: [],
        data: [],
        backgroundColor: ["#a1b56c", "#ab4642"],
      },
    ],
  },
  options: {},
});

// set up game
function init() {
  // generate question list
  questionList = getMasterQuestionList()
    .filter(
      (q) =>
        q.region == selectedRegion ||
        q.subregion == selectedRegion ||
        selectedRegion == ALL_REGIONS
    )
    .sort(() => Math.random() - 0.5);

  // set up state variable
  state.endTime = 0;
  state.finishedGame = false;
  state.startedGame = true;
  state.maxScore = questionList.length;
  state.score = 0;
  state.startTime = date.getTime();
  state.correctAnswers = [];
  state.incorrectAnswers = [];
  state.userAnswer = null;

  // show and hide appropriate elements
  answersHTML.style.display = "";
  settingsHTML.style.display = "none";
  questionHTML.onclick = deinit;
  incorrectAnswersTable.innerHTML =
    "<tr> <th> question </th> <th> answer </th> <th> your answer </th> </tr>";
  correctAnswersTable.innerHTML =
    "<tr> <th> country </th> <th> capital </th>  </tr>";

  // start game
  updateState();
  updateScreen();
  gameTimeStartTime = new Date();
  gameTimeIntervalId = setInterval(updateTime, 1);
}

// stop game, go back to start screen
function deinit() {
  clearInterval(gameTimeIntervalId);

  answersHTML.style.display = "none";
  resultsHTML.style.display = "none";
  settingsHTML.style.display = "";
  questionHTML.innerHTML = "capitals_quiz - select a region to start!";
  scoreHTML.innerHTML = "score";
  questionHTML.onclick = init;
  timeHTML.innerHTML = "time";

  questionList = null;
  state = {
    score: 0,
    maxScore: 0,
    startTime: 0,
    endTime: 0,
    finishedGame: true,
    startedGame: false,
  };
}

function updateState() {
  // check if game is over
  if (questionList.length == 0) {
    state.finishedGame = true;
    return;
  }

  // set up new question
  const newQuestion = questionList.pop();
  console.log(newQuestion);

  var options = [];
  while (options.length < 4) {
    var c =
      getMasterQuestionList()[Math.floor(Math.random() * answerList().length)];
    var question = getQuestionByCountryName(newQuestion.countryname);
    if (question == undefined)
      question = getQuestionByCapital(newQuestion.capital);
    console.log(c);
    console.log(question);
    if (
      c !== getQuestionByCountryName(newQuestion.countryname) &&
      !options.includes(c)
    ) {
      options.push(c);
    }
  }
  var question = getQuestionByCountryName(newQuestion.countryname);
  if (question == undefined)
    question = getQuestionByCapital(newQuestion.capital);
  options[Math.floor(Math.random() * 4)] = question;

  if (state.question)
    state.previousQuestion = {
      question: state.question,
      options: state.options,
      answer: state.answer,
    };

  state.question = newQuestion;
  state.options = options;
  state.answer = question;
  console.log(state);
}

// update HTML elements to reflect values of state
function updateScreen() {
  scoreHTML.innerHTML = state.score + "/" + state.maxScore;
  if (state.finishedGame) {
    displayEndScreen();
    return;
  }

  answerAHTML.getElementsByClassName("text")[0].innerHTML =
    optionToAnswerFormatted(state.options[0]);
  answerBHTML.getElementsByClassName("text")[0].innerHTML =
    optionToAnswerFormatted(state.options[1]);
  answerCHTML.getElementsByClassName("text")[0].innerHTML =
    optionToAnswerFormatted(state.options[2]);
  answerDHTML.getElementsByClassName("text")[0].innerHTML =
    optionToAnswerFormatted(state.options[3]);

  questionHTML.innerHTML = getQuestionHTML(state);
  if (state.previousQuestion) {
    previousQuestionAnswer.innerHTML = optionToAnswerFormatted(
      state.previousQuestion.question
    );
    previousQuestionText.style.display = "";
  }
}

function displayEndScreen() {
  questionHTML.innerHTML = "you did it! click here to restart";
  answers.style.display = "none";
  answers.style.display = "none";

  clearInterval(gameTimeIntervalId);

  if (guessReverseFlag() || guessFlag()) {
    incorrectAnswersTable.innerHTML =
      "<tr> <th> country </th> <th> answer </th> <th> your answer </th> </tr>";
    correctAnswersTable.innerHTML =
      "<tr> <th> flag </th> <th> country </th>  </tr>";
  }

  state.incorrectAnswers.forEach((ans) => {
    var tr = document.createElement("tr");
    console.log(ans);

    tr.appendChild(document.createElement("td"));
    tr.lastChild.innerHTML = optionToQuestionFormatted(ans.question);

    tr.appendChild(document.createElement("td"));
    tr.lastChild.innerHTML = optionToAnswerFormatted(ans.answer);

    tr.appendChild(document.createElement("td"));
    tr.lastChild.innerHTML = optionToAnswerFormatted(
      ans.options[ans.userAnswer]
    );

    incorrectAnswersTable.appendChild(tr);
  });
  if (state.incorrectAnswers.length <= 0)
    incorrectAnswersTable.innerHTML = "no incorrect answers! go you!";

  state.correctAnswers.forEach((ans) => {
    var tr = document.createElement("tr");
    tr.appendChild(document.createElement("td"));
    tr.lastChild.innerHTML = optionToQuestionFormatted(ans.question);
    tr.appendChild(document.createElement("td"));
    tr.lastChild.innerHTML = optionToAnswerFormatted(ans.answer);
    correctAnswersTable.appendChild(tr);
  });
  if (state.correctAnswers.length <= 0)
    correctAnswersTable.innerHTML =
      "no correct answers. better luck next time :')";

  resultsChart.config.data.labels = ["correct", "incorrect"];
  resultsChart.config.data.labels = ["correct", "incorrect"];
  resultsChart.config.data.datasets[0].labels = ["correct", "incorrect"];
  resultsChart.config.data.datasets[0].data = [
    state.correctAnswers.length,
    state.incorrectAnswers.length,
  ];
  resultsChart.update();
  resultsHTML.style.display = "";
}

function processClick(answer) {
  if (state.finishedGame) return;
  // check if answer to previous question  was correct
  var isAnswerCorrect = state.options[answer] == state.answer;
  state.score += isAnswerCorrect ? 1 : 0;
  state.userAnswer = answer;
  state[isAnswerCorrect ? "correctAnswers" : "incorrectAnswers"].push({
    question: state.question,
    options: state.options,
    userAnswer: state.userAnswer,
    answer: state.answer,
  });
  state.userAnswer = null;

  // change background color based on if answer was correct for 500ms
  bodyHTML.classList.add(isAnswerCorrect ? "correct" : "incorrect");
  setTimeout(() => (bodyHTML.classList = []), 500);

  updateState();
  updateScreen();
}

function setRegion(region) {
  selectedRegion = region;
}

// set up event listeners

answerAHTML.addEventListener("click", () => processClick(0));
answerBHTML.addEventListener("click", () => processClick(1));
answerCHTML.addEventListener("click", () => processClick(2));
answerDHTML.addEventListener("click", () => processClick(3));
document.addEventListener("keyup", (e) => {
  if (e.code == "Digit1") processClick(0);
  if (e.code == "Digit2") processClick(1);
  if (e.code == "Digit3") processClick(2);
  if (e.code == "Digit4") processClick(3);
  if (
    e.code == "Enter" &&
    settingsHTML.style.display === "none" &&
    state.finishedGame
  ) {
    deinit();
    return;
  }
  if (e.code == "Enter" && !state.startedGame) init();
});

// start game

deinit();
regionListHTML.innerHTML = regionList()
  .map(
    (region) =>
      `<div class="regionListItem" onclick="setRegion('${region}'); init()"> ${region} </div>`
  )
  .sort()
  .join("");