const STORAGE_KEY = "euchre-scoreboard";

const defaultState = () => ({
  teamUsName: "Us",
  teamThemName: "Them",
  teamUsScore: 0,
  teamThemScore: 0,
  targetScore: 10,
  loneEnabled: true,
  history: [],
  gameOver: false,
});

let state = loadState();

const els = {
  teamUsName: document.getElementById("teamUsName"),
  teamThemName: document.getElementById("teamThemName"),
  teamUsScore: document.getElementById("teamUsScore"),
  teamThemScore: document.getElementById("teamThemScore"),
  targetScore: document.getElementById("targetScore"),
  loneEnabled: document.getElementById("loneEnabled"),
  historyList: document.getElementById("historyList"),
  handCount: document.getElementById("handCount"),
  undoBtn: document.getElementById("undoBtn"),
  resetBtn: document.getElementById("resetBtn"),
  settingsBtn: document.getElementById("settingsBtn"),
  settingsPanel: document.getElementById("settingsPanel"),
  closeSettings: document.getElementById("closeSettings"),
  winnerOverlay: document.getElementById("winnerOverlay"),
  winnerText: document.getElementById("winnerText"),
  winnerScore: document.getElementById("winnerScore"),
  newGameBtn: document.getElementById("newGameBtn"),
  teamUsCard: document.getElementById("teamUsCard"),
  teamThemCard: document.getElementById("teamThemCard"),
};

function loadState() {
  try {
    const saved = localStorage.getItem(STORAGE_KEY);
    if (saved) {
      return { ...defaultState(), ...JSON.parse(saved) };
    }
  } catch {
    /* ignore corrupt storage */
  }
  return defaultState();
}

function saveState() {
  localStorage.setItem(STORAGE_KEY, JSON.stringify(state));
}

function teamLabel(team) {
  return team === "us" ? state.teamUsName : state.teamThemName;
}

function addScore(team, points, label) {
  if (state.gameOver) return;

  const entry = {
    team,
    points,
    label,
    teamUsScore: state.teamUsScore,
    teamThemScore: state.teamThemScore,
    timestamp: Date.now(),
  };

  if (team === "us") {
    state.teamUsScore += points;
  } else {
    state.teamThemScore += points;
  }

  state.history.push(entry);
  checkWinner();
  saveState();
  render();
}

function undoLast() {
  if (!state.history.length) return;

  const last = state.history.pop();
  state.teamUsScore = last.teamUsScore;
  state.teamThemScore = last.teamThemScore;
  state.gameOver = false;
  saveState();
  render();
}

function resetGame(skipConfirm = false) {
  if (
    !skipConfirm &&
    state.history.length &&
    !confirm("Start a new game? Current scores will be lost.")
  ) {
    return;
  }
  state = defaultState();
  state.teamUsName = els.teamUsName.value.trim() || "Us";
  state.teamThemName = els.teamThemName.value.trim() || "Them";
  state.targetScore = Number(els.targetScore.value);
  state.loneEnabled = els.loneEnabled.checked;
  saveState();
  render();
}

function checkWinner() {
  const target = state.targetScore;
  state.gameOver = state.teamUsScore >= target || state.teamThemScore >= target;
}

function renderHistory() {
  const count = state.history.length;
  els.handCount.textContent = `${count} hand${count === 1 ? "" : "s"}`;

  if (!count) {
    els.historyList.innerHTML = '<li class="history-empty">No hands played yet</li>';
    return;
  }

  els.historyList.innerHTML = state.history
    .slice()
    .reverse()
    .map((entry, i) => {
      const handNum = count - i;
      const name = teamLabel(entry.team);
      return `<li>
        <span>#${handNum} — ${name}: ${entry.label}</span>
        <span class="history-points">+${entry.points}</span>
      </li>`;
    })
    .join("");
}

function renderWinner() {
  if (!state.gameOver) {
    els.winnerOverlay.hidden = true;
    els.teamUsCard.classList.remove("winner");
    els.teamThemCard.classList.remove("winner");
    return;
  }

  const usWins = state.teamUsScore >= state.targetScore;
  const winner = usWins ? state.teamUsName : state.teamThemName;
  const winnerScore = usWins ? state.teamUsScore : state.teamThemScore;
  const loserScore = usWins ? state.teamThemScore : state.teamUsScore;

  els.winnerText.textContent = `${winner} wins!`;
  els.winnerScore.textContent = `${winnerScore} – ${loserScore}`;
  els.winnerOverlay.hidden = false;

  if (usWins) {
    els.teamUsCard.classList.add("winner");
    els.teamThemCard.classList.remove("winner");
  } else {
    els.teamThemCard.classList.add("winner");
    els.teamUsCard.classList.remove("winner");
  }
}

function updateLoneButtons() {
  document.querySelectorAll(".lone-btn").forEach((btn) => {
    btn.classList.toggle("hidden", !state.loneEnabled);
  });
}

function render() {
  els.teamUsName.value = state.teamUsName;
  els.teamThemName.value = state.teamThemName;
  els.teamUsScore.textContent = state.teamUsScore;
  els.teamThemScore.textContent = state.teamThemScore;
  els.targetScore.value = String(state.targetScore);
  els.loneEnabled.checked = state.loneEnabled;

  els.undoBtn.disabled = !state.history.length;
  updateLoneButtons();
  renderHistory();
  renderWinner();

  document.querySelectorAll(".btn-score, .btn-euchre").forEach((btn) => {
    btn.disabled = state.gameOver;
  });
}

document.querySelectorAll(".btn-score, .btn-euchre").forEach((btn) => {
  btn.addEventListener("click", () => {
    addScore(btn.dataset.team, Number(btn.dataset.points), btn.dataset.label);
  });
});

els.undoBtn.addEventListener("click", undoLast);
els.resetBtn.addEventListener("click", resetGame);
els.newGameBtn.addEventListener("click", () => resetGame(true));

els.settingsBtn.addEventListener("click", () => {
  els.settingsPanel.hidden = !els.settingsPanel.hidden;
});

els.closeSettings.addEventListener("click", () => {
  state.targetScore = Number(els.targetScore.value);
  state.loneEnabled = els.loneEnabled.checked;
  saveState();
  render();
  els.settingsPanel.hidden = true;
});

els.teamUsName.addEventListener("change", () => {
  state.teamUsName = els.teamUsName.value.trim() || "Us";
  saveState();
  renderHistory();
});

els.teamThemName.addEventListener("change", () => {
  state.teamThemName = els.teamThemName.value.trim() || "Them";
  saveState();
  renderHistory();
});

els.targetScore.addEventListener("change", () => {
  state.targetScore = Number(els.targetScore.value);
  checkWinner();
  saveState();
  render();
});

els.loneEnabled.addEventListener("change", () => {
  state.loneEnabled = els.loneEnabled.checked;
  saveState();
  render();
});

checkWinner();
saveState();
render();