/* 妈妈盒子 · MPA 共享层（无框架，普通 <script>，兼容微信 webview）
   window.MB：openid 解析、带 openid 的 fetch、hash 深链、缓存、UI 工具 */
(function (global) {
  'use strict';
  var API = '/api/mp/public/mama-box';

  function readHash(name) {
    try {
      var h = location.hash.slice(1);
      var m = h.match(new RegExp('(?:^|&)' + name + '=([^&]*)'));
      if (m) return decodeURIComponent(m[1]);
      m = location.search.match(new RegExp('[?&]' + name + '=([^&]*)'));
      if (m) return decodeURIComponent(m[1]);
    } catch (e) {}
    return '';
  }

  var MB = {
    openid: function () { return readHash('openid'); },
    param: readHash,

    /* 拼 hash 深链：page.html#openid=x&key=...（微信 webview 内 hash 不丢） */
    buildUrl: function (page, params) {
      var parts = [];
      var oid = MB.openid();
      if (oid) parts.push('openid=' + encodeURIComponent(oid));
      var p = params || {};
      Object.keys(p).forEach(function (k) { parts.push(k + '=' + encodeURIComponent(p[k])); });
      return page + '.html' + (parts.length ? '#' + parts.join('&') : '');
    },
    go: function (page, params) { location.href = MB.buildUrl(page, params); },

    /* 带 openid 的 GET，解包 {code,message,result} → result 或 null（失败回退） */
    fetch: function (path, params) {
      var oid = MB.openid();
      var qs = [];
      var p = params || {};
      Object.keys(p).forEach(function (k) { qs.push(k + '=' + encodeURIComponent(p[k])); });
      if (oid) qs.push('openid=' + encodeURIComponent(oid));
      var url = API + path + (qs.length ? '?' + qs.join('&') : '');
      return fetch(url)
        .then(function (r) { return r.ok ? r.json() : null; })
        .then(function (j) { return (j && j.code === 200) ? j.result : null; })
        .catch(function () { return null; });
    },
    get: function (path, params) { return MB.fetch(path, params); },

    /* 内存缓存（同一页内避免重复请求） */
    cache: {},
    cached: function (key, fn) {
      if (key in MB.cache) return Promise.resolve(MB.cache[key]);
      return fn().then(function (v) { MB.cache[key] = v; return v; });
    },
    pregnancy: function () { return MB.cached('pregnancy', function () { return MB.fetch('/pregnancy'); }); },
    profile: function () { return MB.cached('profile', function () { return MB.fetch('/profile'); }); },

    /* UI 工具 */
    toast: function (msg) {
      var t = document.getElementById('toast');
      if (!t) return;
      t.textContent = msg; t.classList.add('show');
      clearTimeout(MB._tt); MB._tt = setTimeout(function () { t.classList.remove('show'); }, 1800);
    },
    haptic: function () { if (navigator.vibrate) navigator.vibrate(8); },
    ripple: function (ev) {
      var t = ev.target.closest('.ripple');
      if (!t) return;
      var r = t.getBoundingClientRect();
      var size = Math.max(r.width, r.height) * 2.1;
      var sp = document.createElement('span');
      sp.className = 'rp';
      sp.style.cssText = 'width:' + size + 'px;height:' + size + 'px;left:' + (ev.clientX - r.left) + 'px;top:' + (ev.clientY - r.top) + 'px';
      t.appendChild(sp); setTimeout(function () { sp.remove(); }, 600);
    },

    /* 孕周/日期工具（对齐原型） */
    WEEK: ['周日', '周一', '周二', '周三', '周四', '周五', '周六'],
    weekTxt: function (week, day) {
      return '孕 ' + week + ' 周' + (day ? ' +' + day + ' 天' : '');
    },
    fmtFull: function (ms) {
      var d = new Date(ms);
      return d.getFullYear() + '年' + (d.getMonth() + 1) + '月' + d.getDate() + '日';
    }
  };

  global.MB = MB;
})(window);