// 入口：游戏循环 / 状态机
import { LEVELS, findLevel } from './levels/index.js';
import { Level } from './level.js';
import { Player } from './player.js';
import { Camera } from './camera.js';
import { Input } from './input.js';
import { UI } from './ui.js';
import { Save } from './save.js';
import { Touch } from './touch.js';
import { sfx, unlockAudio, Audio2 } from './audio.js';
import { Editor } from './editor.js';
import { Settings } from './settings.js';
import { clamp } from './util.js';

const W = 800, H = 608;
const STEP = 1000 / 60;

// 移动端检测：触屏设备自动启用虚拟手柄；?touch=1 强制开启，?touch=0 强制关闭（桌面调试用）
// 判定条件：① 是移动端（存在 ontouchstart）/ 支持触屏（maxTouchPoints>0）/ 粗指针（触屏笔或手指）
// 只有命中才给 <html> 加 .touch 类；CSS 里 html:not(.touch) #touch 会强制隐藏，桌面端永远不显示按钮
const _qp = new URLSearchParams(location.search);
const _force = _qp.get('touch');
const _isTouch = ('ontouchstart' in window) || navigator.maxTouchPoints > 0 || matchMedia('(pointer: coarse)').matches;
const useTouch = _force === '1' || (_force !== '0' && _isTouch);
if (useTouch) document.documentElement.classList.add('touch');
function showTouch() { if (useTouch) Touch.show(); }

const canvas = document.getElementById('game');
const ctx = canvas.getContext('2d', { alpha: false });
ctx.imageSmoothingEnabled = false;

const G = {
  state: 'menu',      // menu | playing | paused | result | editor
  level: null, player: null, cam: null,
  data: null, idx: -1,
  map: null, face: 0,   // 多面地图：map=各面 Level 数组，face=当前面下标
  fromEditor: false,    // 是否从编辑器「试玩」进入（决定暂停菜单末项去向）
  deaths: 0, ms: 0, hudTick: 0,
  time: 0,
  lastLevelId: null,
};

// ---------------- 关卡流程 ----------------
// 把一张「面」的数据包装成 Level 可用的 data（门目标来自面自身的 doors）
function faceData(map, face, i) {
  return {
    id: (map.id || 'map') + '-' + i,
    name: face.name || ('面' + (i + 1)),
    type: 'custom',
    width: face.width || (face.grid[0] ? face.grid[0].length : 25),
    grid: face.grid,
    doors: face.doors || [],
    bg: 'custom', hint: '', messages: [],
  };
}

function startLevel(data, idx = -1) {
  unlockAudio();
  G.data = data; G.idx = idx; G.lastLevelId = data.id;
  // 自制多面地图：data.faces 存在则构建每面一个 Level；否则按传统单关处理
  if (data.faces && data.faces.length) {
    G.map = data.faces.map((f, i) => { const L = new Level(faceData(data, f, i)); L.faceIndex = i; return L; });
    G.face = Math.max(0, Math.min(data.startFace || 0, G.map.length - 1));
  } else {
    G.map = [new Level(data)]; G.face = 0;
  }
  G.level = G.map[G.face];
  G.player = new Player(G.level);
  G.cam = new Camera(W, H);
  G.cam.reset(G.level, G.player);
  G.player.onDeath = () => { G.deaths++; };
  G.player.onClear = () => finish();
  G.player.onPortal = (e) => doPortal(e);
  G.player.onRespawnFace = () => doRespawnFace();
  G.level.bosses.forEach(b => { b.onDefeat = () => finish(); });
  G.deaths = 0; G.ms = 0; G.hudTick = 0;
  G.state = 'playing';
  UI.showGame();
  showTouch();
  UI.toast('');
  if (data.hint) UI.toast(data.hint);
}

// 把玩家放到某面某门上（不切面的同面传送也用）
function placeOnDoor(dest) {
  const P = G.player;
  P.x = dest.x + dest.w / 2 - P.w / 2;
  P.y = dest.y + dest.h - P.h;
  P.vx = 0; P.vy = 0; P.jumps = 0;
}

// 踩到门：e.to = {face, door}
function doPortal(e) {
  const to = e.to;
  const tp = Math.max(0, Math.min(G.map.length - 1, to.face | 0));
  if (tp === G.face) {
    const dest = G.map[tp].entities.find(o => o.type === 'warp' && o.doorId === to.door);
    if (dest) { placeOnDoor(dest); dest.cool = 40; }
    sfx.warp();
  } else {
    switchFace(tp, to.door);
  }
}

// 切换到第 f 面，并落到该面的目标门上
function switchFace(f, doorId) {
  G.face = f;
  G.level = G.map[f];
  G.level.reset(true);       // 进入该面时重置其运行时
  G.player.level = G.level;
  const dest = G.level.entities.find(o => o.type === 'warp' && o.doorId === doorId);
  if (dest) { placeOnDoor(dest); dest.cool = 40; }
  else { const sp = G.level.spawn; G.player.x = sp.x; G.player.y = sp.y; G.player.vx = 0; G.player.vy = 0; }
  G.cam.reset(G.level, G.player);
  sfx.warp();
  G.level.particles.spawn(G.player.cx, G.player.cy, 12, { colors: ['#a86bff', '#fff'], speed: 2.5, life: 24 });
}

// 复活回到存档点所在面（跨面）
function doRespawnFace() {
  const sp = G.player.savePoint;
  if (sp && typeof sp.face === 'number' && sp.face !== G.face) {
    G.face = sp.face;
    G.level = G.map[sp.face];
    G.level.reset(true);
    G.player.level = G.level;
    G.cam.reset(G.level, G.player);
  }
}

/** 整关从头再来：保留死亡数，丢弃所有存档点进度 */
function restart() {
  if (!G.data) return;
  const d = G.deaths;
  startLevel(G.data, G.idx);
  G.deaths = d;   // 死亡数不重置
}

/** 自杀（IWBT 的 R 键）：死后自动回到最近的存档点 */
function suicide() {
  if (!G.player || G.state !== 'playing') return;
  G.player.kill();
}

/** 触屏射击：仅在持枪、未死亡且游戏进行中时发射（受玩家自身冷却限制） */
function shoot() {
  const P = G.player;
  if (G.state !== 'playing' || !P || !P.alive || !P.hasGun || P.shootCool !== 0) return;
  P.shoot();
}

function finish() {
  if (G.state !== 'playing') return;
  G.state = 'result';
  Touch.hide();
  sfx.goal();
  const apples = G.player.apples || 0;
  const total = G.level.totalApples || 0;
  const better = Save.clear(G.data.id, G.deaths, G.ms, apples);
  const hasNext = G.idx >= 0 && G.idx + 1 < LEVELS.length;
  UI.result({
    name: G.data.name, ms: G.ms, deaths: G.deaths,
    apples, totalApples: total, better, hasNext,
  });
}

function nextLevel() {
  if (G.idx >= 0 && G.idx + 1 < LEVELS.length) startLevel(LEVELS[G.idx + 1], G.idx + 1);
  else toLevels();
}
function toLevels() { G.state = 'menu'; UI.show('scr-levels'); Touch.hide(); }
function toTitle() { G.state = 'menu'; UI.show('scr-title'); Touch.hide(); }
function toEditor() {
  G.state = 'editor';
  UI.show('scr-editor');
  Touch.hide();
  // 试玩后返回：保留正在编辑的地图；从未进过编辑器时才新建
  if (Editor.faces) Editor.show(); else Editor.open();
}
function pause() {
  if (G.state !== 'playing') return;
  G.state = 'paused';
  // 暂停菜单末项：从编辑器试玩进来 → 「返回编辑器」；否则 → 「返回关卡选择」
  const q = document.querySelector('#scr-pause [data-act="quit"]');
  if (q) q.textContent = G.fromEditor ? '返回编辑器' : '返回关卡选择';
  UI.show('scr-pause');
  Touch.hide();
}
function resume() { if (G.state === 'paused') { G.state = 'playing'; UI.showGame(); showTouch(); } }

// ---------------- 更新 ----------------
function update() {
  const P = G.player;
  // R = 自杀回存档点；Backspace = 整关重开
  if (Input.hit('suicide')) { suicide(); return; }
  if (Input.hit('restart')) { restart(); return; }
  if (Input.hit('pause')) { pause(); return; }

  const wasDead = P.dead;
  G.level.update(1, P, G.cam);
  for (const b of G.level.bosses) b.update(1, P);
  P.update(1);
  // 刚从死亡中复活：若存档点在别的面，先切回该面，再镜头瞬移
  if (P.justRespawned) {
    if (P.savePoint && typeof P.savePoint.face === 'number' && P.savePoint.face !== G.face) doRespawnFace();
    G.cam.snapTo(P, G.level);
    P.justRespawned = false;
  }
  G.cam.update(G.level, P, 1);
  G.ms += STEP;
  G.time++;

  if (++G.hudTick % 5 === 0) {
    const L = G.level;
    UI.hud({
      name: G.data.name + (G.map.length > 1 ? ` · 面${G.face + 1}/${G.map.length}` : ''),
      deaths: G.deaths, ms: G.ms,
      apples: P.apples, totalApples: L.totalApples, hasGun: P.hasGun,
      save: P.saveIdx || 0, totalSaves: L.totalSaves || 0,
    });
    Touch.setGun(P.hasGun);
    const boss = L.bosses.find(b => !b.dead) || L.bosses[0];
    UI.bossBar(L.bosses.length ? boss : null);
  }
}

// ---------------- 渲染 ----------------
function render() {
  const t = G.time;
  if (G.state === 'playing' || G.state === 'paused' || G.state === 'result') {
    const L = G.level, P = G.player, C = G.cam;
    ctx.fillStyle = '#0a0a14';
    ctx.fillRect(0, 0, W, H);
    L.drawBg(ctx, C, t);
    ctx.save();
    C.apply(ctx);
    L.draw(ctx, C, t);
    for (const b of L.bosses) b.draw(ctx, t);
    P.draw(ctx);
    ctx.restore();
    L.drawOverlay(ctx, C, t);
    UI.toast(L.toast || '');
  } else {
    drawTitleBg(t);
  }
}

function drawTitleBg(t) {
  const g = ctx.createLinearGradient(0, 0, 0, H);
  g.addColorStop(0, '#181828'); g.addColorStop(1, '#08080f');
  ctx.fillStyle = g; ctx.fillRect(0, 0, W, H);
  // 漂浮的刺
  ctx.globalAlpha = 0.5;
  for (let i = 0; i < 26; i++) {
    const x = ((i * 137 + t * 0.15) % (W + 60)) - 30;
    const y = 120 + ((i * 71) % (H - 160));
    ctx.fillStyle = i % 3 === 0 ? '#3a3a4c' : '#2a2a38';
    ctx.beginPath();
    ctx.moveTo(x, y + 18); ctx.lineTo(x + 11, y); ctx.lineTo(x + 22, y + 18);
    ctx.closePath(); ctx.fill();
  }
  ctx.globalAlpha = 1;
  // 底部刺海
  ctx.fillStyle = '#1a1a26';
  ctx.fillRect(0, H - 30, W, 30);
  ctx.fillStyle = '#c8c8d8';
  for (let x = 0; x < W; x += 22) {
    ctx.beginPath();
    ctx.moveTo(x, H - 4); ctx.lineTo(x + 11, H - 26); ctx.lineTo(x + 22, H - 4);
    ctx.closePath(); ctx.fill();
  }
}

// ---------------- 主循环 ----------------
let last = performance.now(), acc = 0;
function loop(now) {
  requestAnimationFrame(loop);
  let dt = now - last; last = now;
  if (dt > 200) dt = 200;
  acc += dt;
  let guard = 0;
  while (acc >= STEP && guard++ < 6) {
    acc -= STEP;
    if (G.state === 'playing') update();
    else if (G.state === 'paused' && Input.hit('pause')) resume();
    Input.endFrame();
  }
  if (G.state !== 'playing') G.time++;
  render();
}

// ---------------- 启动 ----------------
let settingsFrom = 'scr-title';   // 进入设置前的界面，确定后返回
Save.load();
Audio2.enabled = Save.data.audio !== false;

UI.init({
  play: (lv) => { G.fromEditor = false; startLevel(lv, lv.builtin === false ? -1 : (lv.index ?? -1)); },
  levels: toLevels,
  manage: () => UI.setManage(!UI.manage),
  editor: toEditor,
  settings: () => { settingsFrom = UI.cur; Settings.enter(); UI.show('scr-settings'); },
  'set-ok': () => { Settings.confirm(); UI.show(settingsFrom); },
  'set-reset': () => Settings.reset(),
  back: toTitle,
  resume,
  restart: () => { restart(); },
  quit: () => (G.fromEditor ? toEditor() : toLevels()),
  retry: () => startLevel(G.data, G.idx),
  next: nextLevel,
  wipe: () => {
    if (confirm('确定清除所有通关记录与自制关卡？')) { Save.wipe(); UI.renderLevels(); }
  },
});

Editor.init({
  startLevel: (data) => { G.fromEditor = true; startLevel(data, -1); },
  refresh: () => UI.renderLevels(),
});

// 首次交互解锁音频
const unlock = () => { unlockAudio(); removeEventListener('pointerdown', unlock); removeEventListener('keydown', unlock); };
addEventListener('pointerdown', unlock);
addEventListener('keydown', unlock);

// 移动端虚拟手柄
Touch.init({ pause, suicide, shoot });
Settings.init(useTouch);

UI.show('scr-title');
requestAnimationFrame(loop);

// 调试钩子
window.__IW = { G, LEVELS, Save, startLevel, pause, resume, restart, suicide };