// Lista completa con país y siglas según ISO 3166-1 alpha-2
const countryList = [
  { name: "España", code: "ES" }, { name: "Francia", code: "FR" }, { name: "Alemania", code: "DE" }, { name: "Italia", code: "IT" },
  { name: "Portugal", code: "PT" }, { name: "Reino Unido", code: "GB" }, { name: "Estados Unidos", code: "US" }, { name: "Canadá", code: "CA" },
  { name: "México", code: "MX" }, { name: "Brasil", code: "BR" }, { name: "Argentina", code: "AR" }, { name: "Chile", code: "CL" },
  { name: "Japón", code: "JP" }, { name: "China", code: "CN" }, { name: "Australia", code: "AU" }, { name: "Rusia", code: "RU" },
  { name: "Sudáfrica", code: "ZA" }, { name: "Nueva Zelanda", code: "NZ" }, { name: "India", code: "IN" }, { name: "Egipto", code: "EG" },
  { name: "Grecia", code: "GR" }, { name: "Turquía", code: "TR" }, { name: "Ucrania", code: "UA" }, { name: "Suecia", code: "SE" },
  { name: "Noruega", code: "NO" }, { name: "Dinamarca", code: "DK" }, { name: "Finlandia", code: "FI" }, { name: "Irlanda", code: "IE" },
  { name: "Bélgica", code: "BE" }, { name: "Polonia", code: "PL" }, { name: "Suiza", code: "CH" }, { name: "Países Bajos", code: "NL" }
];

function getFlagEmoji(code) {
  // Las banderas se generan a partir de letras usando unicode, no por siglas textuales
  // Solo funcionan para países con código alpha-2 y script latino
  if (!code || code.length !== 2) return "";
  return String.fromCodePoint(
    ...code.toUpperCase().split("").map(c => 0x1F1E6 + c.charCodeAt(0) - 65)
  );
}

// Para elegir N países aleatorios distintos con bandera
function pickRandomCountries(list, n) {
  const chosen = [];
  const used = {};
  while (chosen.length < n && list.length > 0) {
    let idx = Math.floor(Math.random() * list.length);
    let c = list[idx];
    let flag = getFlagEmoji(c.code);
    if (flag && !used[c.code]) {
      chosen.push({name: c.name, code: c.code, flag});
      used[c.code] = true;
    }
    list.splice(idx,1);
  }
  return chosen;
}

let flagsDiv = document.getElementById('flags');
let countriesDiv = document.getElementById('countries');
let statusDiv = document.getElementById('status');
let scoreSpan = document.getElementById('score-value');
let scoreTotal = document.getElementById('score-total');
let restartBtn = document.getElementById('restart-btn');

let pairs = [], flags = [], countries = [], selectedFlag = null, selectedCountry = null, score = 0, totalPairs = 12;

function shuffle(arr) {
  for (let i = arr.length-1; i>0; i--) {
    const j = Math.floor(Math.random() * (i+1));
    [arr[i], arr[j]] = [arr[j], arr[i]];
  }
}

function startGame() {
  let fullList = countryList.slice(); // copia
  pairs = pickRandomCountries(fullList, totalPairs);
  flags = pairs.map(o=>o);
  countries = pairs.map(o=>o);
  shuffle(flags); shuffle(countries);
  score = 0;
  scoreSpan.textContent = score;
  scoreTotal.textContent = pairs.length;
  selectedFlag = selectedCountry = null;
  renderFlags();
  renderCountries();
  statusDiv.textContent = 'Empareja todas las banderas con su país';
}

function renderFlags() {
  flagsDiv.innerHTML = '';
  flags.forEach((p, i) => {
    const d = document.createElement('div');
    d.className = 'flag';
    d.textContent = p.flag;
    d.setAttribute('tabindex', 0);
    d.onclick = () => selectFlag(i);
    if (p.matched) d.classList.add('matched');
    if (selectedFlag === i) d.classList.add('selected');
    flagsDiv.appendChild(d);
  });
}

function renderCountries() {
  countriesDiv.innerHTML = '';
  countries.forEach((p, i) => {
    const d = document.createElement('div');
    d.className = 'country';
    d.textContent = p.name;
    d.setAttribute('tabindex', 0);
    d.onclick = () => selectCountry(i);
    if (p.matched) d.classList.add('matched');
    if (selectedCountry === i) d.classList.add('selected');
    countriesDiv.appendChild(d);
  });
}

function selectFlag(i) {
  if (flags[i].matched) return;
  selectedFlag = i;
  renderFlags();
  if (selectedCountry !== null) checkMatch();
}

function selectCountry(i) {
  if (countries[i].matched) return;
  selectedCountry = i;
  renderCountries();
  if (selectedFlag !== null) checkMatch();
}

function checkMatch() {
  const flagObj = flags[selectedFlag];
  const countryObj = countries[selectedCountry];
  if (flagObj.code === countryObj.code) {
    flags[selectedFlag].matched = true;
    countries[selectedCountry].matched = true;
    score++;
    scoreSpan.textContent = score;
    statusDiv.textContent = '¡Correcto!';
    renderFlags();
    renderCountries();
    if (score === pairs.length) {
      statusDiv.textContent = '¡Has emparejado todas las banderas! 🎉';
    }
  } else {
    statusDiv.textContent = 'No es correcto, intenta otra vez.';
    setTimeout(() => {
      statusDiv.textContent = '';
      selectedFlag = selectedCountry = null;
      renderFlags();
      renderCountries();
    }, 850);
    return;
  }
  selectedFlag = null;
  selectedCountry = null;
}

restartBtn.onclick = startGame;
startGame();