/* Account-scoped, local-only form preferences. No credentials or report data. */
(function(root, factory) {
  if (typeof module === 'object' && module.exports) module.exports = factory();
  else root.ProfileStore = factory();
})(typeof window !== 'undefined' ? window : this, function() {
  'use strict';
  function key(user) {
    return user && user.kind === 'wechat' && typeof user.id === 'string' && user.id.length <= 128 && user.id
      ? 'juzi.profile.v1.' + user.kind + '.' + encodeURIComponent(user.id) : null;
  }
  function age(birth, now) {
    if (typeof birth !== 'string' || !/^\d{4}-(0[1-9]|1[0-2])$/.test(birth)) return null;
    now = now || new Date();
    var y = Number(birth.slice(0, 4)), m = Number(birth.slice(5));
    var value = now.getFullYear() - y - (now.getMonth() + 1 < m ? 1 : 0);
    return value >= 1 && value <= 99 ? value : null;
  }
  function clean(input, regions, skinCount, now) {
    input = input && typeof input === 'object' ? input : {};
    var region = input.region, validRegion = null;
    if (region && typeof region === 'object') (regions || []).some(function(p) {
      if (p[0] !== region.province || p[1].indexOf(region.city) < 0) return false;
      validRegion = { province: p[0], city: region.city }; return true;
    });
    return { birth: age(input.birth, now) == null ? '' : input.birth,
      gender: ['女', '男'].indexOf(input.gender) < 0 ? '' : input.gender,
      region: validRegion, skinIndex: Number.isInteger(input.skinIndex) && input.skinIndex >= 0 && input.skinIndex < skinCount ? input.skinIndex : 0 };
  }
  function create(getStorage) {
    var memory = Object.create(null);
    return {
      read: function(user) {
        var name = key(user), raw;
        if (!name) return null;
        if (Object.prototype.hasOwnProperty.call(memory, name)) return memory[name];
        try { raw = getStorage().getItem(name); } catch (_) { /* Private/restricted storage. */ }
        if (raw == null) return null;
        try { return raw.length <= 4096 ? JSON.parse(raw) : null; } catch (_) { return null; }
      },
      write: function(user, value) {
        var name = key(user);
        if (!name) return;
        memory[name] = value;
        try { getStorage().setItem(name, JSON.stringify(value)); } catch (_) { /* Keep this page usable without persistence. */ }
      }
    };
  }
  return { key: key, age: age, clean: clean, create: create };
});