(function (root, factory) {
  // 反馈模块同时支持浏览器页面和 Node 测试。
  if (typeof module === 'object' && module.exports) {
    module.exports = factory(root);
    return;
  }

  root.FeedbackPages = factory(root);
  if (root.document) {
    root.document.addEventListener('DOMContentLoaded', function () {
      root.FeedbackPages.init();
    });
  }
})(typeof globalThis !== 'undefined' ? globalThis : window, function (root) {
  'use strict';

  var documentRef = root.document;

  function normalizeList(data) {
    // 兼容分页 rows、records、list 和直接数组。
    if (Array.isArray(data)) return data;
    if (!data || typeof data !== 'object') return [];
    if (Array.isArray(data.rows)) return data.rows;
    if (Array.isArray(data.records)) return data.records;
    if (Array.isArray(data.list)) return data.list;
    if (Array.isArray(data.data)) return data.data;
    return [];
  }

  function pick(item, keys, fallback) {
    var source = item || {};
    var index;
    var value;

    for (index = 0; index < keys.length; index += 1) {
      value = source[keys[index]];
      if (value !== undefined && value !== null && value !== '') return value;
    }

    return fallback || '';
  }

  function buildFeedbackBody(values) {
    // 接口只接收类型、内容、联系方式；页面上的标题合并到内容前面。
    var title = values.feedbackTitle ? '【' + values.feedbackTitle + '】' : '';

    return {
      feedbackType: values.feedbackType || 'suggestion',
      feedbackContent: title + (values.feedbackContent || ''),
      contactInfo: values.contactInfo || ''
    };
  }

  function buildFeedbackRow(item) {
    var type = pick(item, ['feedbackType', 'typeName'], '反馈');
    var content = pick(item, ['feedbackContent', 'content'], '暂无描述');
    var status = pick(item, ['status', 'statusName'], '已提交');
    var time = pick(item, ['createTime', 'createDate', 'createdAt'], '时间待确认');

    return '<div class="module-row"><div><h3>' + type + '</h3><p>' +
      status + ' · ' + time + ' · ' + content +
      '</p></div><span class="pill">查看</span></div>';
  }

  function getApi() {
    return root.GenealogyApi && root.GenealogyApi.defaultClient;
  }

  function query(selector, rootNode) {
    return (rootNode || documentRef).querySelector(selector);
  }

  function queryAll(selector, rootNode) {
    return Array.prototype.slice.call((rootNode || documentRef).querySelectorAll(selector));
  }

  function readForm(form) {
    // name 属性和反馈接口字段保持一致，减少页面文案变化带来的影响。
    var values = {};

    queryAll('input[name], textarea[name], select[name]', form).forEach(function (field) {
      values[field.name] = String(field.value || '').trim();
    });

    return values;
  }

  function setBusy(button, busy) {
    // 加载态只切换 class，具体样式在 CSS 中维护。
    if (!button) return;
    button.classList.toggle('is-loading', busy);
    if ('disabled' in button) button.disabled = busy;
    button.setAttribute('aria-busy', busy ? 'true' : 'false');
  }

  function showMessage(message) {
    if (root.layui && root.layui.layer) {
      root.layui.layer.msg(message);
      return;
    }

    root.alert(message);
  }

  function renderFeedbackList(items) {
    var container = query('[data-feedback-list]');

    if (!container) return;
    if (!items.length) {
      container.innerHTML = '<div class="api-empty">暂无历史反馈</div>';
      return;
    }

    container.innerHTML = items.map(buildFeedbackRow).join('');
  }

  async function loadFeedbackList() {
    var api = getApi();
    var container = query('[data-feedback-list]');

    if (!api || !container) return;
    container.classList.add('is-loading');
    try {
      renderFeedbackList(normalizeList(await api.feedbackList()));
    } catch (error) {
      showMessage(error.message || '历史反馈加载失败');
    } finally {
      container.classList.remove('is-loading');
    }
  }

  async function submitFeedback(form, button) {
    var api = getApi();
    var values = readForm(form);

    if (!api) return;
    if (!values.feedbackContent) {
      showMessage('请填写反馈内容');
      return;
    }

    setBusy(button, true);
    try {
      await api.submitFeedback(buildFeedbackBody(values));
      form.reset();
      showMessage('反馈已提交');
      loadFeedbackList();
    } catch (error) {
      showMessage(error.message || '反馈提交失败');
    } finally {
      setBusy(button, false);
    }
  }

  function bindFeedbackForms() {
    queryAll('[data-feedback-form]').forEach(function (form) {
      form.addEventListener('submit', function (event) {
        event.preventDefault();
        submitFeedback(form, query('[type="submit"]', form));
      });
    });
  }

  function init() {
    if (!documentRef) return;

    bindFeedbackForms();
    loadFeedbackList();
  }

  return {
    normalizeList: normalizeList,
    buildFeedbackBody: buildFeedbackBody,
    buildFeedbackRow: buildFeedbackRow,
    init: init
  };
});