import { Network, ServerMessage } from './network.js';
import { ClientMessage } from './protocol.js';
import { startBattle } from './battle.js';
import { unlockAudio } from './audio.js';
import { getLang } from '../i18n.js';

const container = document.getElementById('lobby');

// Статичные подписи UI лобби переводим; данные из сервера (ники, room id,
// текст ошибок) остаются как есть — они генерируются на сервере только на русском.
const STR = {
  ru: {
    connecting: 'подключение...',
    join: 'войти',
    createCoop: 'создать комнату (coop)',
    createPvp: 'создать комнату (pvp)',
    refresh: 'обновить список',
    empty: 'пока пусто — создай комнату',
    ready: 'готов',
    readySuffix: ' — готов',
    waitingForSecond: 'жду второго игрока (1/2) — открой комнату во второй вкладке/другим человеком',
    soloHint: 'можно начать соло, второй игрок сможет подключиться позже',
    room: 'комната',
    mode: 'режим:',
    leave: 'выйти в лобби',
  },
  en: {
    connecting: 'connecting...',
    join: 'join',
    createCoop: 'create room (coop)',
    createPvp: 'create room (pvp)',
    refresh: 'refresh list',
    empty: 'nothing here yet — create a room',
    ready: 'ready',
    readySuffix: ' — ready',
    waitingForSecond: 'waiting for a second player (1/2) — open the room in another tab or have someone else join',
    soloHint: 'you can start solo, a second player can join later',
    room: 'room',
    mode: 'mode:',
    leave: 'leave to lobby',
  },
};

function t() {
  return STR[getLang()];
}

let net;
let myPlayerId = null;
let rooms = [];
let currentRoom = null;
let errorMessage = '';
let connected = false;
let nickname = 'cacto-' + Math.floor(Math.random() * 1000);

// Ники приходят от других игроков (сервер их только режет по длине, не
// экранирует) и попадают сюда через innerHTML — без экранирования это XSS.
function escapeHtml(str) {
  return String(str).replace(/[&<>"']/g, (c) => ({
    '&': '&amp;',
    '<': '&lt;',
    '>': '&gt;',
    '"': '&quot;',
    "'": '&#39;',
  }[c]));
}

function roomRow(room) {
  const full = room.players >= room.max_players;
  return `
    <li class="room-list__item">
      <span class="room-list__name">${room.name}</span>
      <span class="tag">${room.mode}</span>
      <span class="room-list__count">${room.players}/${room.max_players}</span>
      <span class="room-list__state">${room.state}</span>
      <button data-action="join" data-room-id="${room.id}" ${full || room.state !== 'waiting' || !connected ? 'disabled' : ''}>${t().join}</button>
    </li>`;
}

function errorBanner() {
  return errorMessage ? `<p class="lobby-error">! ${errorMessage}</p>` : '';
}

function renderLobbyView() {
  const dis = connected ? '' : 'disabled';
  container.innerHTML = `
    <div class="lobby-panel">
      ${errorBanner()}
      ${connected ? '' : `<p class="lobby-error">${t().connecting}</p>`}
      <div class="lobby-panel__row">
        <label class="prompt-inline">nickname</label>
        <input id="nickname-input" type="text" value="${escapeHtml(nickname)}" maxlength="20" ${dis} />
      </div>
      <div class="lobby-panel__row">
        <button data-action="create" data-mode="coop" ${dis}>${t().createCoop}</button>
        <button data-action="create" data-mode="pvp" ${dis}>${t().createPvp}</button>
        <button data-action="refresh" ${dis}>${t().refresh}</button>
      </div>
      <ul class="room-list">
        ${rooms.length === 0 ? `<li class="room-list__empty">${t().empty}</li>` : rooms.map(roomRow).join('')}
      </ul>
    </div>`;
}

function renderRoomView() {
  const full = currentRoom.players.length >= 2;
  let statusLine = '';
  let readyBtn = `<button data-action="ready">${t().ready}</button>`;
  if (currentRoom.mode === 'pvp' && !full) {
    statusLine = `<p class="lobby-error">${t().waitingForSecond}</p>`;
    readyBtn = `<button data-action="ready" disabled>${t().ready}</button>`;
  } else if (currentRoom.mode === 'coop' && !full) {
    statusLine = `<p class="lobby-error">${t().soloHint}</p>`;
  }
  container.innerHTML = `
    <div class="lobby-panel">
      ${errorBanner()}
      <h3 class="prompt">${t().room} ${currentRoom.name}</h3>
      <p>${t().mode} <span class="tag">${currentRoom.mode}</span></p>
      <ul class="room-players">
        ${currentRoom.players.map((p) => `<li>${escapeHtml(p.nickname)}${p.ready ? t().readySuffix : ''}</li>`).join('')}
      </ul>
      ${statusLine}
      ${readyBtn}
      <button data-action="leave">${t().leave}</button>
    </div>`;
}

function render() {
  if (currentRoom) {
    renderRoomView();
  } else {
    renderLobbyView();
  }
}

// Вызывается из battle.js по кнопкам экрана победы/поражения.
export function returnToLobbyContainer() {
  document.getElementById('tanks-canvas-container').style.display = 'none';
  container.style.display = '';
  render();
}

export function leaveRoomAndReturn() {
  currentRoom = null;
  net.leaveRoom();
  returnToLobbyContainer();
}

container?.addEventListener('click', (e) => {
  const btn = e.target.closest('[data-action]');
  if (!btn) return;
  errorMessage = '';
  switch (btn.dataset.action) {
    case 'create':
      net.createRoom(btn.dataset.mode);
      break;
    case 'join':
      net.joinRoom(btn.dataset.roomId);
      break;
    case 'ready':
      unlockAudio();
      net.send(ClientMessage.GAME_READY);
      break;
    case 'leave':
      currentRoom = null;
      net.leaveRoom();
      render();
      break;
    case 'refresh':
      net.listRooms();
      break;
  }
});

container?.addEventListener('change', (e) => {
  if (e.target.id === 'nickname-input') {
    nickname = e.target.value.trim() || nickname;
  }
});

export function initLobby() {
  net = new Network();

  net.on('_open', () => net.hello(nickname));
  net.on(ServerMessage.HELLO_ACK, (payload) => {
    connected = true;
    myPlayerId = payload.player_id;
    net.listRooms();
  });
  net.on('_close', () => {
    connected = false;
    render();
  });

  net.on(ServerMessage.LOBBY_ROOMS, (payload) => {
    rooms = payload.rooms;
    render();
  });

  net.on(ServerMessage.LOBBY_ROOM_JOINED, (payload) => {
    currentRoom = payload;
    render();
  });

  net.on(ServerMessage.LOBBY_ROOM_UPDATED, (payload) => {
    if (currentRoom) {
      currentRoom.players = payload.players;
      render();
    }
  });

  net.on(ServerMessage.GAME_START, (payload) => {
    startBattle(net, payload, myPlayerId);
  });

  net.on(ServerMessage.ERROR, (payload) => {
    console.error('[gameserver] error:', payload);
    errorMessage = payload.message;
    render();
  });

  window.addEventListener('cacto:langchange', render);

  render();
  return net;
}