/* Astrion 品牌形象组件 —— 渲染 + 眨眼 + 鼠标追踪
 *
 * 用法：
 *   AstrionAvatar.mount(el, { mode: 'idle' | 'think', blink: true, track: true })
 *
 * idle 模式：竖线双眼，随机眨眼，眼睛组随鼠标方向轻微偏移。
 * think 模式：三个波浪圆点（不追踪、不眨眼）。
 */

(function () {
  'use strict';

  var SVG_NS = 'http://www.w3.org/2000/svg';

  // —— 精确还原 StatusAvatar.vue 的几何参数 ——
  var FRAME_PATH =
    'M 175.959,107.000 Q 180.000,100.000 175.959,93.000 ' +
    'L 144.041,37.718 Q 140.000,30.718 131.917,30.718 ' +
    'L 68.083,30.718 Q 60.000,30.718 55.959,37.718 ' +
    'L 24.041,93.000 Q 20.000,100.000 24.041,107.000 ' +
    'L 55.959,162.282 Q 60.000,169.282 68.083,169.282 ' +
    'L 131.917,169.282 Q 140.000,169.282 144.041,162.282 Z';

  // 眼睛 path 的 18 个数字：M a,b Q c,d e,f Q g,h i,j Q k,l m,n Q o,p q,r
  var EYE_IDLE = [0, -11, 0, -5.5, 0, 0, 0, 5.5, 0, 11, 0, 5.5, 0, 0, 0, -5.5, 0, -11];
  var EYE_BLINK = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
  var EYE_LEFT = { x: 84, y: 96 };
  var EYE_RIGHT = { x: 116, y: 96 };

  // 鼠标追踪参数（viewBox 单位）
  var TRACK_MAX = 7; // 最大偏移
  var TRACK_RANGE = 140; // 屏幕 px 内达到最大偏移
  var TRACK_LERP = 0.14;

  function eyePathD(n) {
    return (
      'M ' + n[0] + ',' + n[1] +
      ' Q ' + n[2] + ',' + n[3] + ' ' + n[4] + ',' + n[5] +
      ' Q ' + n[6] + ',' + n[7] + ' ' + n[8] + ',' + n[9] +
      ' Q ' + n[10] + ',' + n[11] + ' ' + n[12] + ',' + n[13] +
      ' Q ' + n[14] + ',' + n[15] + ' ' + n[16] + ',' + n[17]
    );
  }

  function svgEl(tag, attrs) {
    var el = document.createElementNS(SVG_NS, tag);
    for (var k in attrs) el.setAttribute(k, attrs[k]);
    return el;
  }

  // —— 眨眼 morph：同构 path 数字线性插值 ——
  function morphEyes(eyes, from, to, duration, done) {
    var start = null;
    function step(ts) {
      if (!start) start = ts;
      var t = Math.min((ts - start) / duration, 1);
      var e = t < 0.5 ? 2 * t * t : 1 - Math.pow(-2 * t + 2, 2) / 2; // easeInOutQuad
      var cur = from.map(function (v, i) { return v + (to[i] - v) * e; });
      var d = eyePathD(cur);
      eyes[0].setAttribute('d', d);
      eyes[1].setAttribute('d', d);
      if (t < 1) requestAnimationFrame(step);
      else if (done) done();
    }
    requestAnimationFrame(step);
  }

  // —— 全局注视驱动（单 rAF 循环驱动所有实例） ——
  // 每个实例二选一：useMouse 跟随鼠标；或 manual 目标（动画模块用 handle().lookAt 驱动）
  var tracked = [];
  var mouse = { x: -9999, y: -9999 };
  var rafRunning = false;

  function trackLoop() {
    for (var i = 0; i < tracked.length; i++) {
      var inst = tracked[i];
      if (!document.contains(inst.svg)) { tracked.splice(i--, 1); continue; }
      var tx, ty;
      if (inst.manual) {
        tx = inst.manual.x;
        ty = inst.manual.y;
      } else if (inst.useMouse) {
        var rect = inst.svg.getBoundingClientRect();
        if (rect.width === 0) continue;
        var cx = rect.left + rect.width / 2;
        var cy = rect.top + rect.height / 2;
        var dx = mouse.x - cx;
        var dy = mouse.y - cy;
        var dist = Math.hypot(dx, dy) || 1;
        var reach = Math.min(dist / TRACK_RANGE, 1) * TRACK_MAX;
        tx = (dx / dist) * reach;
        ty = (dy / dist) * reach;
      } else {
        tx = 0;
        ty = 0;
      }
      inst.cur.x += (tx - inst.cur.x) * TRACK_LERP;
      inst.cur.y += (ty - inst.cur.y) * TRACK_LERP;
      inst.eyes.setAttribute(
        'transform',
        'translate(' + inst.cur.x.toFixed(2) + ',' + inst.cur.y.toFixed(2) + ')'
      );
    }
    if (tracked.length > 0) requestAnimationFrame(trackLoop);
    else rafRunning = false;
  }

  window.addEventListener('mousemove', function (e) {
    mouse.x = e.clientX;
    mouse.y = e.clientY;
  }, { passive: true });

  function mount(el, opts) {
    opts = opts || {};
    var mode = opts.mode || 'idle';
    var svg = svgEl('svg', {
      class: 'astrion-avatar',
      viewBox: '0 0 200 200',
      'aria-hidden': 'true'
    });
    svg.appendChild(svgEl('path', { class: 'aa-frame', d: FRAME_PATH }));

    if (mode === 'think') {
      var think = svgEl('g', { class: 'aa-think' });
      [80, 100, 120].forEach(function (x) {
        think.appendChild(svgEl('circle', { class: 'aa-think-dot', cx: x, cy: 100, r: 7 }));
      });
      svg.appendChild(think);
    } else {
      var eyes = svgEl('g', { class: 'aa-eyes' });
      var eyeL = svgEl('path', {
        class: 'aa-eye',
        transform: 'translate(' + EYE_LEFT.x + ',' + EYE_LEFT.y + ')',
        d: eyePathD(EYE_IDLE)
      });
      var eyeR = svgEl('path', {
        class: 'aa-eye',
        transform: 'translate(' + EYE_RIGHT.x + ',' + EYE_RIGHT.y + ')',
        d: eyePathD(EYE_IDLE)
      });
      eyes.appendChild(eyeL);
      eyes.appendChild(eyeR);
      svg.appendChild(eyes);

      var pair = [eyeL, eyeR];

      if (opts.blink !== false) {
        (function scheduleBlink() {
          var delay = 2200 + Math.random() * 2600;
          setTimeout(function () {
            if (!document.contains(svg)) return;
            morphEyes(pair, EYE_IDLE, EYE_BLINK, 120, function () {
              setTimeout(function () {
                morphEyes(pair, EYE_BLINK, EYE_IDLE, 170, scheduleBlink);
              }, 60);
            });
          }, delay);
        })();
      }

      // 所有 idle 实例都注册进驱动循环：useMouse=false 时由 handle().lookAt 手动驱动
      var inst = {
        svg: svg,
        eyes: eyes,
        eyeL: eyeL,
        eyeR: eyeR,
        cur: { x: 0, y: 0 },
        manual: null,
        useMouse: opts.track !== false,
        pathNums: EYE_IDLE.slice(),
        morphToken: 0
      };
      svg._aaInst = inst;
      tracked.push(inst);
      if (!rafRunning) {
        rafRunning = true;
        requestAnimationFrame(trackLoop);
      }
    }

    el.appendChild(svg);
    return svg;
  }

  /* 动画模块用的眼睛控制手柄（仅 idle 模式实例可用）：
     lookAt(dx,dy) 直接给 viewBox 偏移；lookAtPoint(cx,cy) 看向屏幕某点；
     morphEyesTo(nums,ms) 眼睛形状渐变（困眼/瞪眼）；setEyePath 瞬切。 */
  function handle(svg) {
    var inst = svg && svg._aaInst;
    if (!inst) return null;
    var h = {
      lookAt: function (dx, dy) {
        var m = Math.hypot(dx, dy);
        if (m > TRACK_MAX) { dx = (dx / m) * TRACK_MAX; dy = (dy / m) * TRACK_MAX; }
        inst.manual = { x: dx, y: dy };
      },
      lookAtPoint: function (clientX, clientY) {
        var rect = inst.svg.getBoundingClientRect();
        if (rect.width === 0) return;
        var cx = rect.left + rect.width / 2;
        var cy = rect.top + rect.height / 2;
        var dx = (clientX - cx) / (rect.width / 200);
        var dy = (clientY - cy) / (rect.height / 200);
        var d = Math.hypot(dx, dy) || 1;
        var s = Math.min(d / 60, 1); /* 60 个 viewBox 单位外达到最大注视 */
        h.lookAt((dx / d) * TRACK_MAX * s, (dy / d) * TRACK_MAX * s);
      },
      releaseLook: function () { inst.manual = null; },
      setEyePath: function (nums) {
        inst.morphToken++;
        inst.pathNums = nums.slice();
        var d = eyePathD(nums);
        inst.eyeL.setAttribute('d', d);
        inst.eyeR.setAttribute('d', d);
      },
      morphEyesTo: function (nums, ms, done) {
        var token = ++inst.morphToken;
        var from = inst.pathNums.slice();
        var start = null;
        function stepFn(ts) {
          if (token !== inst.morphToken) return; /* 被更新的 morph 接管，静默退出 */
          if (!start) start = ts;
          var t = Math.min((ts - start) / ms, 1);
          var e = t < 0.5 ? 2 * t * t : 1 - Math.pow(-2 * t + 2, 2) / 2;
          var cur = from.map(function (v, i) { return v + (nums[i] - v) * e; });
          var d = eyePathD(cur);
          inst.eyeL.setAttribute('d', d);
          inst.eyeR.setAttribute('d', d);
          if (t < 1) requestAnimationFrame(stepFn);
          else { inst.pathNums = nums.slice(); if (done) done(); }
        }
        requestAnimationFrame(stepFn);
      }
    };
    return h;
  }

  /* 由 IDLE 眼睛派生缩放版本（困=缩短，瞪=加长）：只缩放 y 分量（x 分量全为 0） */
  function eyeScale(k) {
    return EYE_IDLE.map(function (v, i) { return i % 2 ? v * k : v; });
  }

  window.AstrionAvatar = {
    mount: mount,
    handle: handle,
    eyeScale: eyeScale,
    EYE_IDLE: EYE_IDLE,
    EYE_BLINK: EYE_BLINK
  };
})();