// Taobao scopes are independent: userInfo login does not grant camera/album.
var denied = {};
function state(settings, scope) {
  settings = settings || {};
  var key = scope.replace(/^scope\./, '');
  return typeof settings[scope] === 'boolean' ? settings[scope] : settings[key];
}
function settings() {
  return new Promise(function (resolve) {
    if (typeof my.getSetting !== 'function') { resolve({}); return; }
    my.getSetting({ success: function (res) { resolve(res.authSetting || {}); }, fail: function () { resolve({}); } });
  });
}
function rejected(scope) {
  var err = new Error(scope === 'scope.camera' ? '相机权限未开启，可在授权设置中开启，或使用相册' : '相册权限未开启，请在授权设置中开启');
  err.permission = scope; return err;
}
function ensure(scope) {
  return settings().then(function (current) {
    if (state(current, scope) === true) { delete denied[scope]; return; }
    if (state(current, scope) === false || denied[scope]) throw rejected(scope);
    return new Promise(function (resolve, reject) {
      if (typeof my.authorize !== 'function') { reject(new Error('当前淘宝版本不支持授权，请升级后重试')); return; }
      my.authorize({ scopes: scope, success: function () { delete denied[scope]; resolve(); },
        fail: function () { denied[scope] = true; reject(rejected(scope)); } });
    });
  });
}
function open() {
  return new Promise(function (resolve, reject) {
    if (typeof my.openSetting !== 'function') { reject(new Error('请在小程序右上角的授权设置中开启权限')); return; }
    my.openSetting({ success: function (res) {
      var current = res.authSetting || {};
      ['scope.camera', 'scope.album'].forEach(function (scope) { if (state(current, scope) === true) delete denied[scope]; });
      resolve(current);
    }, fail: function () { reject(new Error('无法打开授权设置，请从小程序右上角进入')); } });
  });
}
module.exports = { ensure: ensure, settings: settings, state: state, open: open };