const state = {
  roomId: null,
  participantId: null,
  snapshot: null,
  socket: null,
  reconnectTimer: null,
};

const dom = {};

document.addEventListener("DOMContentLoaded", () => {
  bindDom();
  bindEvents();
  restoreSession();
});

function bindDom() {
  dom.flash = document.getElementById("flash");
  dom.createRoomForm = document.getElementById("create-room-form");
  dom.joinRoomForm = document.getElementById("join-room-form");
  dom.joinRoomId = document.getElementById("join-room-id");
  dom.roomView = document.getElementById("room-view");
  dom.roomCode = document.getElementById("room-code");
  dom.shareLink = document.getElementById("share-link");
  dom.copyLinkButton = document.getElementById("copy-link-button");
  dom.renameForm = document.getElementById("rename-form");
  dom.renameInput = document.getElementById("rename-input");
  dom.viewerRole = document.getElementById("viewer-role");
  dom.connectionState = document.getElementById("connection-state");
  dom.startGameButton = document.getElementById("start-game-button");
  dom.leaveSeatButton = document.getElementById("leave-seat-button");
  dom.seatGrid = document.getElementById("seat-grid");
  dom.participantList = document.getElementById("participant-list");
  dom.activityList = document.getElementById("activity-list");
  dom.turnTitle = document.getElementById("turn-title");
  dom.redRemaining = document.getElementById("red-remaining");
  dom.blueRemaining = document.getElementById("blue-remaining");
  dom.clueHelp = document.getElementById("clue-help");
  dom.clueForm = document.getElementById("clue-form");
  dom.clueWord = document.getElementById("clue-word");
  dom.clueCount = document.getElementById("clue-count");
  dom.activeClue = document.getElementById("active-clue");
  dom.endTurnButton = document.getElementById("end-turn-button");
  dom.boardGrid = document.getElementById("board-grid");
  dom.boardEmpty = document.getElementById("board-empty");
}

function bindEvents() {
  dom.createRoomForm.addEventListener("submit", async (event) => {
    event.preventDefault();
    const formData = new FormData(dom.createRoomForm);
    const payload = await api("/api/rooms", {
      method: "POST",
      body: JSON.stringify({ displayName: formData.get("displayName") }),
    });
    enterRoom(payload);
  });

  dom.joinRoomForm.addEventListener("submit", async (event) => {
    event.preventDefault();
    const formData = new FormData(dom.joinRoomForm);
    const roomId = String(formData.get("roomId") || "").trim().toUpperCase();
    const payload = await api(`/api/rooms/${encodeURIComponent(roomId)}/join`, {
      method: "POST",
      body: JSON.stringify({ displayName: formData.get("displayName") }),
    });
    enterRoom(payload);
  });

  dom.renameForm.addEventListener("submit", (event) => {
    event.preventDefault();
    sendAction("rename", { displayName: dom.renameInput.value.trim() });
  });

  dom.copyLinkButton.addEventListener("click", async () => {
    await navigator.clipboard.writeText(dom.shareLink.value);
    flash("Join-Link in die Zwischenablage kopiert.");
  });

  dom.startGameButton.addEventListener("click", () => sendAction("start-game"));
  dom.leaveSeatButton.addEventListener("click", () => sendAction("leave-seat"));
  dom.endTurnButton.addEventListener("click", () => sendAction("end-turn"));

  dom.clueForm.addEventListener("submit", (event) => {
    event.preventDefault();
    sendAction("submit-clue", {
      word: dom.clueWord.value.trim(),
      count: Number(dom.clueCount.value),
    });
    dom.clueWord.value = "";
  });

  document.addEventListener("click", (event) => {
    const button = event.target.closest("[data-action]");
    if (!button) {
      return;
    }

    const action = button.dataset.action;
    if (action === "take-seat") {
      sendAction("take-seat", {
        team: button.dataset.team,
        role: button.dataset.role,
      });
    }
    if (action === "guess-card") {
      sendAction("guess-card", {
        cardIndex: Number(button.dataset.cardIndex),
      });
    }
  });
}

async function restoreSession() {
  const params = new URLSearchParams(window.location.search);
  const roomId = (params.get("room") || "").trim().toUpperCase();
  const participantId = params.get("player") || "";

  if (roomId) {
    dom.joinRoomId.value = roomId;
  }

  if (!roomId || !participantId) {
    return;
  }

  try {
    const snapshot = await api(`/api/rooms/${encodeURIComponent(roomId)}?participantId=${encodeURIComponent(participantId)}`);
    state.roomId = roomId;
    state.participantId = participantId;
    state.snapshot = snapshot;
    render();
    connectSocket();
  } catch (error) {
    flash(error.message);
  }
}

async function enterRoom(payload) {
  state.roomId = payload.roomId;
  state.participantId = payload.participantId;
  state.snapshot = payload.snapshot;
  const params = new URLSearchParams({ room: state.roomId, player: state.participantId });
  window.history.replaceState({}, "", `${window.location.pathname}?${params.toString()}`);
  render();
  connectSocket(true);
}

function connectSocket(forceReconnect = false) {
  if (forceReconnect && state.socket) {
    state.socket.close();
  }
  if (!state.roomId || !state.participantId) {
    return;
  }
  if (state.socket && state.socket.readyState === WebSocket.OPEN) {
    return;
  }

  const protocol = window.location.protocol === "https:" ? "wss" : "ws";
  const socketUrl = `${protocol}://${window.location.host}/ws?roomId=${encodeURIComponent(state.roomId)}&participantId=${encodeURIComponent(state.participantId)}`;
  state.socket = new WebSocket(socketUrl);

  setConnectionState("verbinde ...");

  state.socket.addEventListener("open", () => {
    setConnectionState("verbunden");
  });

  state.socket.addEventListener("message", (event) => {
    const message = JSON.parse(event.data);
    if (message.type === "snapshot") {
      state.snapshot = message.snapshot;
      render();
      return;
    }
    if (message.type === "error") {
      flash(message.message);
    }
  });

  state.socket.addEventListener("close", () => {
    setConnectionState("getrennt");
    if (state.reconnectTimer) {
      window.clearTimeout(state.reconnectTimer);
    }
    state.reconnectTimer = window.setTimeout(() => connectSocket(), 1500);
  });
}

function sendAction(type, payload = {}) {
  if (!state.socket || state.socket.readyState !== WebSocket.OPEN) {
    flash("Die WebSocket-Verbindung ist noch nicht bereit.");
    return;
  }
  state.socket.send(JSON.stringify({ type, ...payload }));
}

function render() {
  const snapshot = state.snapshot;
  const inRoom = Boolean(snapshot);
  dom.roomView.classList.toggle("hidden", !inRoom);
  if (!inRoom) {
    return;
  }

  document.title = `Codenames ${snapshot.roomId}`;
  dom.roomCode.textContent = snapshot.roomId;
  dom.shareLink.value = `${window.location.origin}${window.location.pathname}?room=${snapshot.roomId}`;
  dom.renameInput.value = snapshot.viewer.displayName;
  dom.viewerRole.textContent = formatViewerRole(snapshot.viewer);

  renderSeats(snapshot);
  renderParticipants(snapshot);
  renderActivity(snapshot);
  renderGame(snapshot);
  renderControls(snapshot);
}

function renderSeats(snapshot) {
  const canChangeSeats = snapshot.game.status !== "IN_PROGRESS";
  dom.seatGrid.innerHTML = snapshot.seats.map((seat) => {
    const occupied = Boolean(seat.participantId);
    return `
      <button
        type="button"
        class="seat-card ${seat.team.toLowerCase()} ${occupied ? "occupied" : "vacant"} ${seat.yours ? "yours" : ""}"
        data-action="${occupied || !canChangeSeats ? "" : "take-seat"}"
        data-team="${seat.team}"
        data-role="${seat.role}"
      >
        <span class="seat-team">${labelForTeam(seat.team)}</span>
        <strong>${labelForRole(seat.role)}</strong>
        <span>${occupied ? seat.participantName : "Frei"}</span>
      </button>
    `;
  }).join("");

  const hasSeat = snapshot.viewer.team && snapshot.viewer.role;
  dom.leaveSeatButton.classList.toggle("hidden", !(hasSeat && canChangeSeats));
}

function renderParticipants(snapshot) {
  dom.participantList.innerHTML = snapshot.participants.map((participant) => {
    const role = participant.team && participant.role
      ? `${labelForTeam(participant.team)} ${labelForRole(participant.role)}`
      : "Zuschauer";
    return `
      <article class="participant-card ${participant.host ? "host" : ""}">
        <div>
          <strong>${escapeHtml(participant.displayName)}</strong>
          <span>${role}</span>
        </div>
        ${participant.participantId === snapshot.viewer.participantId ? "<em>Du</em>" : participant.host ? "<em>Host</em>" : ""}
      </article>
    `;
  }).join("");
}

function renderActivity(snapshot) {
  dom.activityList.innerHTML = snapshot.activity.map((item) => {
    const time = new Date(item.timestamp).toLocaleTimeString("de-AT", {
      hour: "2-digit",
      minute: "2-digit",
    });
    return `
      <article class="activity-item">
        <span>${time}</span>
        <p>${escapeHtml(item.message)}</p>
      </article>
    `;
  }).join("");
}

function renderGame(snapshot) {
  const game = snapshot.game;
  dom.redRemaining.textContent = String(game.redRemaining);
  dom.blueRemaining.textContent = String(game.blueRemaining);

  if (game.status === "LOBBY") {
    dom.turnTitle.textContent = "Lobby bereit machen";
    dom.boardGrid.innerHTML = "";
    dom.boardEmpty.classList.remove("hidden");
    dom.boardEmpty.textContent = "Sobald der Host startet, werden hier 25 Begriffe ausgespielt.";
    dom.activeClue.classList.add("hidden");
    return;
  }

  dom.turnTitle.textContent = describeTurn(game);
  dom.boardEmpty.classList.add("hidden");
  dom.boardGrid.innerHTML = game.cards.map((card) => {
    const classes = [
      "board-card",
      card.revealed ? "revealed" : "hidden-card",
      card.visibleAffiliation ? card.visibleAffiliation.toLowerCase() : "unknown",
      card.clickable ? "clickable" : "",
    ].join(" ");

    return `
      <button
        type="button"
        class="${classes}"
        ${card.clickable ? `data-action="guess-card" data-card-index="${card.index}"` : "disabled"}
      >
        <span class="word">${escapeHtml(card.word)}</span>
        <span class="affiliation">${card.visibleAffiliation ? labelForAffiliation(card.visibleAffiliation) : "verdeckt"}</span>
      </button>
    `;
  }).join("");

  if (game.clue) {
    const guesses = game.remainingGuesses == null ? "?" : String(game.remainingGuesses);
    dom.activeClue.classList.remove("hidden");
    dom.activeClue.innerHTML = `
      <span>Aktueller Hinweis</span>
      <strong>${escapeHtml(game.clue.word)}</strong>
      <p>${game.clue.count} Karten, noch ${guesses} Versuche.</p>
    `;
  } else {
    dom.activeClue.classList.add("hidden");
  }
}

function renderControls(snapshot) {
  const viewer = snapshot.viewer;
  const game = snapshot.game;

  dom.startGameButton.classList.toggle("hidden", !viewer.canStartGame);
  dom.clueForm.classList.toggle("hidden", !viewer.canGiveClue);
  dom.endTurnButton.classList.toggle("hidden", !viewer.canEndTurn);

  if (game.status === "FINISHED") {
    dom.clueHelp.textContent = `${labelForTeam(game.winner)} gewinnt diese Runde. Rollen koennen in derselben Lobby neu verteilt werden.`;
    return;
  }
  if (viewer.canGiveClue) {
    dom.clueHelp.textContent = "Du bist Hinweisgeber. Gib jetzt ein einziges Wort plus Anzahl weiter.";
    return;
  }
  if (viewer.canGuess) {
    dom.clueHelp.textContent = "Du bist Ermittler. Klickt die passenden Karten oder beendet den Zug freiwillig.";
    return;
  }
  if (game.status === "LOBBY") {
    dom.clueHelp.textContent = "Vier Rollen besetzen, dann kann der Host das Match starten.";
    return;
  }
  if (game.phase === "CLUE") {
    dom.clueHelp.textContent = `${labelForTeam(game.currentTeam)} wartet gerade auf den naechsten Hinweis.`;
    return;
  }
  dom.clueHelp.textContent = "Die Runde laeuft. Beobachte den aktuellen Hinweis und das Board.";
}

function describeTurn(game) {
  if (game.status === "FINISHED") {
    return `${labelForTeam(game.winner)} gewinnt`;
  }
  if (game.phase === "CLUE") {
    return `${labelForTeam(game.currentTeam)} gibt den Hinweis`;
  }
  return `${labelForTeam(game.currentTeam)} raet`;
}

function formatViewerRole(viewer) {
  if (!viewer.team || !viewer.role) {
    return viewer.host ? "Host und Zuschauer" : "Zuschauer";
  }
  return `${labelForTeam(viewer.team)} ${labelForRole(viewer.role)}${viewer.host ? " und Host" : ""}`;
}

function setConnectionState(text) {
  dom.connectionState.textContent = text;
}

async function api(url, options = {}) {
  const response = await fetch(url, {
    headers: {
      "Content-Type": "application/json",
    },
    ...options,
  });

  const body = await response.json().catch(() => ({}));
  if (!response.ok) {
    throw new Error(body.message || "Die Anfrage konnte nicht verarbeitet werden.");
  }
  return body;
}

function flash(message) {
  dom.flash.textContent = message;
  dom.flash.classList.remove("hidden");
  window.setTimeout(() => dom.flash.classList.add("hidden"), 3200);
}

function labelForTeam(team) {
  return team === "RED" ? "Rot" : "Blau";
}

function labelForRole(role) {
  return role === "SPYMASTER" ? "Hinweisgeber" : "Ermittler";
}

function labelForAffiliation(affiliation) {
  if (affiliation === "ASSASSIN") {
    return "Attentaeter";
  }
  if (affiliation === "NEUTRAL") {
    return "Neutral";
  }
  return labelForTeam(affiliation);
}

function escapeHtml(text) {
  return String(text)
    .replaceAll("&", "&amp;")
    .replaceAll("<", "&lt;")
    .replaceAll(">", "&gt;")
    .replaceAll("\"", "&quot;")
    .replaceAll("'", "&#039;");
}