/* ═════ 巨子测肤 H5 — 交互逻辑 ═════ */
(function () {
  'use strict';

  var $ = function (sel, root) { return (root || document).querySelector(sel); };

  /* ─── Toast ─── */
  var toastEl = $('#toast'), toastTimer = null;
  function toast(msg) {
    toastEl.textContent = msg;
    toastEl.classList.add('show');
    clearTimeout(toastTimer);
    toastTimer = setTimeout(function () { toastEl.classList.remove('show'); }, 1800);
  }

  /* ─── 屏幕管理 ─── */
  var currentScreen = 's-splash';
  function showScreen(id) {
    document.querySelectorAll('.screen').forEach(function (s) {
      s.classList.toggle('active', s.id === id);
    });
    var sc = document.getElementById(id);
    sc.scrollTop = 0;
    currentScreen = id;
  }

  /* ─── 弹窗管理 ─── */
  function openOverlay(id)  { $('#' + id).classList.add('show'); }
  function closeOverlay(id) { $('#' + id).classList.remove('show'); }

  /* ─── 肤质轮播 ─── */
  var SKINS = [
    { img: 'assets/img/skin-0-dry.png',       name: '干性肌肤',     desc: '全脸干燥，容易紧绷、缺乏光泽' },
    { img: 'assets/img/skin-1-mixeddry.png',  name: '混合偏干肌肤', desc: '两颊偏干，T区油脂较少或偶尔出油' },
    { img: 'assets/img/skin-2-neutral.png',   name: '中性肌肤',     desc: '水油平衡，肤感舒适，无明显干燥出油' },
    { img: 'assets/img/skin-3-oily.png',      name: '油性肌肤',     desc: '全脸易出油，容易泛油光、毛孔明显' },
    { img: 'assets/img/skin-4-mixedoily.png', name: '混合偏油肌肤', desc: 'T区易出油，两颊相对清爽或轻微干燥' }
  ];
  var skinIndex = 0;
  var track = $('#skin-track'), dotsBox = $('#skin-dots');

  SKINS.forEach(function (s, i) {
    var item = document.createElement('div');
    item.className = 'skin-item';
    item.innerHTML =
      '<img src="' + s.img + '" alt="' + s.name + '">' +
      '<span class="skin-name">' + s.name + '</span>' +
      '<p class="skin-desc">' + s.desc + '</p>';
    track.appendChild(item);
    var dot = document.createElement('i');
    if (i === 0) dot.className = 'on';
    dot.addEventListener('click', function () { goSkin(i); });
    dotsBox.appendChild(dot);
  });

  function goSkin(i) {
    skinIndex = Math.max(0, Math.min(SKINS.length - 1, i));
    track.style.transform = 'translateX(-' + skinIndex * 100 + '%)';
    dotsBox.querySelectorAll('i').forEach(function (d, k) {
      d.classList.toggle('on', k === skinIndex);
    });
  }

  // 触摸滑动
  var touchX = null;
  $('#skin-carousel').addEventListener('touchstart', function (e) {
    touchX = e.touches[0].clientX;
  }, { passive: true });
  $('#skin-carousel').addEventListener('touchend', function (e) {
    if (touchX === null) return;
    var dx = e.changedTouches[0].clientX - touchX;
    if (Math.abs(dx) > 30) goSkin(skinIndex + (dx < 0 ? 1 : -1));
    touchX = null;
  }, { passive: true });

  /* ─── 地区选项 ─── */
  var REGIONS = ['北京', '上海', '广州', '深圳', '杭州', '成都', '重庆', '武汉', '西安', '南京', '天津', '苏州', '长沙', '郑州', '青岛', '其他'];
  var regionSel = $('#f-region');
  REGIONS.forEach(function (r) {
    var o = document.createElement('option');
    o.textContent = r;
    regionSel.appendChild(o);
  });

  /* ─── 拍照流程 ─── */
  var CAM_STEPS = [
    { bg: 'assets/img/cam-front.jpg', step: '1/3<br>请单人正脸出镜', guides: ['正脸居中', '取下眼镜', '光线充足'] },
    { bg: 'assets/img/cam-left.jpg',  step: '2/3<br>请单人右脸出镜', guides: ['右脸居中', '取下眼镜', '光线充足'] },
    { bg: 'assets/img/cam-right.jpg', step: '3/3<br>请单人左脸出镜', guides: ['左脸居中', '取下眼镜', '光线充足'] }
  ];
  var camStep = 0;

  function renderCamStep() {
    var cfg = CAM_STEPS[camStep];
    $('#cam-bg').style.backgroundImage = 'url(' + cfg.bg + ')';
    $('#cam-step').innerHTML = cfg.step;
    $('#cam-guide').innerHTML = cfg.guides
      .map(function (g) { return '<span>' + g + '</span>'; })
      .join('<i></i>');
  }

  function shutter() {
    var flash = $('#cam-flash');
    flash.classList.add('on');
    setTimeout(function () { flash.classList.remove('on'); }, 220);
    setTimeout(function () {
      if (camStep < CAM_STEPS.length - 1) {
        camStep++;
        renderCamStep();
      } else {
        camStep = 0;
        renderCamStep();
        openOverlay('p-analyzing');
        setTimeout(function () {
          closeOverlay('p-analyzing');
          showScreen('s-report');
        }, 1600);
      }
    }, 260);
  }

  /* ─── 隐私勾选 ─── */
  var agreed = false;
  $('#privacy-row').addEventListener('click', function (e) {
    e.preventDefault();
    agreed = !agreed;
    $('#privacy-check').classList.toggle('checked', agreed);
  });

  /* ─── 报告页 Tab ─── */
  $('#detail-tabs').addEventListener('click', function (e) {
    var btn = e.target.closest('.dtab');
    if (!btn) return;
    var idx = btn.dataset.tab;
    document.querySelectorAll('.dtab').forEach(function (t) { t.classList.toggle('active', t === btn); });
    document.querySelectorAll('.dpanel').forEach(function (p) {
      p.classList.toggle('active', p.dataset.panel === idx);
    });
  });

  /* ─── 动作分发 ─── */
  var actions = {
    'open-privacy':    function () { openOverlay('p-privacy'); },
    'close-privacy':   function () { closeOverlay('p-privacy'); },
    'agree-continue':  function () {
      if (!agreed) { toast('请先阅读并同意隐私协议'); return; }
      closeOverlay('p-privacy');
      showScreen('s-profile');
    },
    'back-splash':     function () { showScreen('s-splash'); },
    'submit-profile':  function () {
      var age = $('#f-age').value.trim();
      if (!age || !/^\d{1,2}$/.test(age) || +age < 1 || +age > 99) { toast('请输入有效年龄'); return; }
      if (!$('#f-gender').value) { toast('请选择性别'); return; }
      if (!regionSel.value) { toast('请选择所在地区'); return; }
      openOverlay('p-photoguide');
    },
    'close-photoguide': function () { closeOverlay('p-photoguide'); },
    'start-camera':    function () {
      closeOverlay('p-photoguide');
      camStep = 0;
      renderCamStep();
      showScreen('s-cam');
    },
    'cam-back':        function () {
      if (camStep > 0) { camStep--; renderCamStep(); }
      else { showScreen('s-profile'); }
    },
    'shutter':         shutter,
    'album':           function () { toast('相册功能开发中'); },
    'flip':            function () { toast('切换镜头功能开发中'); },
    'back-profile':    function () { showScreen('s-profile'); },
    'more':            function () { toast('了解更多功能开发中'); }
  };

  document.addEventListener('click', function (e) {
    var el = e.target.closest('[data-action]');
    if (!el) return;
    var fn = actions[el.dataset.action];
    if (fn) fn();
  });

  /* ─── 初始化 ─── */
  renderCamStep();
})();