// 设置：用户名 + 手机虚拟手柄按钮的自定义（位置/大小，拖动调整）
import { Save } from './save.js';

// 每个可自定义的手柄按钮：key 对应 touch.js 里的 data-touch，
// def 为默认布局（cx/cy 为相对舞台中心的百分比，size 为按钮边长 px）
const BUTTONS = [
  { key: 'left',    label: '◀',  shape: 'round', def: { cx: 12, cy: 80, size: 62 } },
  { key: 'right',   label: '▶',  shape: 'round', def: { cx: 24, cy: 80, size: 62 } },
  { key: 'jump',    label: '跳', shape: 'jump',  def: { cx: 88, cy: 84, size: 94 } },
  { key: 'shoot',   label: '🔫', shape: 'item',  label2: '射击', def: { cx: 79, cy: 72, size: 54 } },
  { key: 'down',    label: '▼',  shape: 'item',  label2: '下蹲', def: { cx: 90, cy: 72, size: 54 } },
  { key: 'pause',   label: '❚❚', shape: 'sm',    def: { cx: 81, cy: 58, size: 42 } },
  { key: 'suicide', label: '↺',  shape: 'sm',    def: { cx: 90, cy: 58, size: 42 } },
];

const clone = (o) => JSON.parse(JSON.stringify(o));
const DEFAULT_TOUCH = {};
BUTTONS.forEach(b => { DEFAULT_TOUCH[b.key] = clone(b.def); });
const makeDefaults = () => ({ username: '', touch: clone(DEFAULT_TOUCH) });

// 工作副本（未点「确定」前不落盘，点「返回」即丢弃）
let work = makeDefaults();
let wrap = null;
const els = {};

/** 读取/补全存档里的设置对象（保证 touch 字段齐全） */
function meta() {
  if (!Save.data.settings) Save.data.settings = { username: '' };
  if (!Save.data.settings.touch) Save.data.settings.touch = clone(DEFAULT_TOUCH);
  return Save.data.settings;
}

/** 把某个按钮按 p={cx,cy,size} 绝对定位（百分比定位 + 像素边长） */
function place(el, p) {
  el.style.left = p.cx + '%';
  el.style.top = p.cy + '%';
  el.style.width = p.size + 'px';
  el.style.height = p.size + 'px';
}

/** 把当前存档布局应用到真正的 #touch 手柄按钮（游戏内生效） */
function apply() {
  const t = meta().touch;
  for (const b of BUTTONS) {
    const el = document.querySelector(`#touch [data-touch="${b.key}"]`);
    if (!el) continue;
    const p = t[b.key];
    if (!p) continue;
    el.style.left = p.cx + '%';
    el.style.top = p.cy + '%';
    el.style.width = p.size + 'px';
    el.style.height = p.size + 'px';
  }
}

/** 标题界面显示当前用户名 */
function showUsername() {
  const el = document.getElementById('title-user');
  if (el) el.textContent = '玩家：' + (meta().username || '无名氏');
}

export const Settings = {
  init() {
    wrap = document.getElementById('touch-preview');
    work = clone(meta());
    this.build();
    showUsername();
    apply();
  },

  /** 构建设置界面里的可拖拽手柄预览（克隆 #touch 的按钮形状） */
  build() {
    if (!wrap) return;
    wrap.querySelectorAll('.tc-btn').forEach(n => n.remove());
    for (const b of BUTTONS) {
      const el = document.createElement('div');
      el.className = 'tc-btn tc-' + b.shape;
      el.innerHTML = `<span>${b.label}</span>` + (b.label2 ? `<span class="lbl">${b.label2}</span>` : '');
      const h = document.createElement('div');
      h.className = 'tc-rsz';
      el.appendChild(h);
      wrap.appendChild(el);
      els[b.key] = el;
      place(el, work.touch[b.key]);
      wire(el, h, b.key);
    }
  },

  /** 打开设置界面：从存档同步工作副本与输入框 */
  enter() {
    const s = meta();
    work = { username: s.username || '', touch: clone(s.touch) };
    const inp = document.getElementById('set-username');
    if (inp) inp.value = work.username;
    this.build();
  },

  /** 确定：保存用户名与手柄布局到存档 */
  confirm() {
    const s = meta();
    const inp = document.getElementById('set-username');
    work.username = (inp ? inp.value : '').trim().slice(0, 16);
    s.username = work.username;
    s.touch = clone(work.touch);
    Save.flush();
    showUsername();
    apply();
  },

  /** 恢复默认：布局与用户名全部回到出厂值（仅影响工作副本，需点确定才落盘） */
  reset() {
    work = makeDefaults();
    const inp = document.getElementById('set-username');
    if (inp) inp.value = '';
    this.build();
  },

  /** 供调试 / 测试使用 */
  _state() { return work; },
  _els() { return els; },
};

/** 给单个预览按钮绑定「拖动移动」与「右下角缩放」 */
function wire(el, handle, key) {
  let mode = null;                 // 'move' | 'resize'
  let rect = null;                 // 预览区矩形（按下时记录）
  let lastX = 0, lastY = 0;        // 上一帧指针（相对位移用）
  let startSize = 0, startDist = 1, cx0 = 0, cy0 = 0;  // 缩放用：按下时按钮中心与指针距离

  // 按下：只记录基准，不重算绝对坐标 —— 避免任何「按下即跳角」
  const begin = (e, m) => {
    e.preventDefault();
    try { (m === 'resize' ? handle : el).setPointerCapture(e.pointerId); } catch (_) { }
    mode = m;
    rect = wrap.getBoundingClientRect();
    const W = rect.width || 1, H = rect.height || 1;
    const p = work.touch[key];
    lastX = e.clientX; lastY = e.clientY;
    if (m === 'resize') {
      cx0 = rect.left + p.cx / 100 * W;
      cy0 = rect.top + p.cy / 100 * H;
      startSize = p.size;
      startDist = Math.max(1, Math.hypot(e.clientX - cx0, e.clientY - cy0));
    }
  };

  // 移动：用「相对上一帧的位移」累加，第一帧必然停在正确位置
  const drag = (e) => {
    if (!mode || !rect) return;
    const p = work.touch[key];
    if (mode === 'move') {
      const W = rect.width || 1, H = rect.height || 1;
      const dx = (e.clientX - lastX) / W * 100;   // 像素位移 → 百分比
      const dy = (e.clientY - lastY) / H * 100;
      lastX = e.clientX; lastY = e.clientY;
      p.cx = Math.max(3, Math.min(97, p.cx + dx));
      p.cy = Math.max(3, Math.min(97, p.cy + dy));
    } else {
      const d = Math.max(1, Math.hypot(e.clientX - cx0, e.clientY - cy0));
      p.size = Math.max(24, Math.min(160, startSize * (d / startDist)));
    }
    place(el, p);
  };

  const end = (e) => {
    if (mode) { try { (mode === 'resize' ? handle : el).releasePointerCapture(e.pointerId); } catch (_) { } }
    mode = null;
  };

  el.addEventListener('pointerdown', (e) => { if (e.target === handle) return; begin(e, 'move'); });
  handle.addEventListener('pointerdown', (e) => { e.stopPropagation(); begin(e, 'resize'); });
  el.addEventListener('pointermove', drag);
  handle.addEventListener('pointermove', drag);
  el.addEventListener('pointerup', end);
  handle.addEventListener('pointerup', end);
  el.addEventListener('pointercancel', end);
  handle.addEventListener('pointercancel', end);
}