/**
 * Jio Follow — 前台关注交互
 *
 * @package Jio
 */
(function () {
  'use strict';

  var CONFIG = window.jioData || {};
  var API_ROOT = (function () {
    var raw = CONFIG.apiUrl || CONFIG.restUrl || CONFIG.rest_url || '/index.php?rest_route=/jio/v1';
    return String(raw).replace(/\/$/, '');
  })();
  var NONCE = CONFIG.restNonce || '';

  function buttonsFor(userId) {
    return Array.prototype.slice.call(document.querySelectorAll('[data-jio-follow="' + userId + '"]'));
  }

  function notify(message, type) {
    if (typeof window.notyf !== 'function') return;
    window.notyf(message, type || 'info');
  }

  /** 站点登录弹窗由 auth.js 的全局委托接管，这里只点一下触发器。 */
  function openLoginModal() {
    var trigger = document.querySelector('.signin-loader') ||
      document.querySelector('[data-jio-auth-required]') ||
      document.querySelector('#nav-login-btn');
    if (trigger) trigger.click();
  }

  /** 待发送态：按钮置灰不可重复提交，文案换成行内加载点。 */
  function setPending(button, pending) {
    var label = button.querySelector('[data-jio-follow-label]');
    if (pending) {
      button.setAttribute('disabled', '');
      button.setAttribute('aria-disabled', 'true');
      if (label) {
        label.dataset.jioFollowLabel = label.textContent;
        label.innerHTML = '<i class="loading zts"></i>';
      }
      return;
    }
    button.removeAttribute('disabled');
    button.removeAttribute('aria-disabled');
    if (label && label.dataset.jioFollowLabel !== undefined) {
      label.textContent = label.dataset.jioFollowLabel;
      delete label.dataset.jioFollowLabel;
    }
  }

  function updateButton(button, isFollowing) {
    var label = button.querySelector('[data-jio-follow-label]');
    if (!label) return;

    button.classList.toggle('actived', isFollowing);
    var icon = button.querySelector('i');
    if (icon) {
      var sizeClass = /\bem09\b/.test(icon.className) ? ' em09' : '';
      icon.className = (isFollowing ? 'fa fas fa-heart' : 'fa far fa-heart') + sizeClass;
    }
    label.textContent = isFollowing
      ? button.getAttribute('data-jio-follow-ok') || '已关注'
      : button.getAttribute('data-jio-follow-text') || '关注';
    delete label.dataset.jioFollowLabel;
    button.title = isFollowing ? '点击取消关注' : '关注该用户';
  }

  /** 关注数只在浏览被关注者本人的主页时同步，避免改到别人的粉丝数。 */
  function updateFollowerCount(targetUserId, count) {
    if (count === undefined || count === null) return;
    var scope = document.querySelector('.dashboard[data-user-id="' + targetUserId + '"]');
    if (!scope) return;
    scope.querySelectorAll('[data-follow-count="followers"]').forEach(function (node) {
      node.textContent = count;
    });
  }

  document.addEventListener('click', function (event) {
    var button = event.target.closest('[data-jio-follow]');
    if (!button) return;
    event.preventDefault();

    var targetUserId = parseInt(button.getAttribute('data-jio-follow'), 10);
    if (!targetUserId || button.hasAttribute('disabled')) return;

    var matchingButtons = buttonsFor(targetUserId);
    matchingButtons.forEach(function (matchingButton) {
      setPending(matchingButton, true);
    });

    fetch(API_ROOT + '/follow/toggle', {
      method: 'POST',
      credentials: 'same-origin',
      headers: {
        'Content-Type': 'application/json',
        'X-WP-Nonce': NONCE,
      },
      body: JSON.stringify({ target_user_id: targetUserId }),
    })
      .then(function (response) {
        // 会话失效时直接拉起登录弹窗，不再额外弹错误提示。
        if (response.status === 401 || response.status === 403) {
          openLoginModal();
          return null;
        }
        return response.json().catch(function () {
          throw new Error('操作失败');
        });
      })
      .then(function (result) {
        if (!result) return;
        if (!result.success || !result.data) {
          notify(result.message || '操作失败', 'danger');
          return;
        }

        var isFollowing = Boolean(result.data.is_following);
        matchingButtons.forEach(function (matchingButton) {
          updateButton(matchingButton, isFollowing);
        });
        updateFollowerCount(targetUserId, result.data.follower_count);

        if (!isFollowing) {
          var managementItem = button.closest('.uc-follow-management__item');
          if (managementItem) managementItem.remove();
        }
        notify(isFollowing ? '已关注此用户' : '已取消关注此用户', 'success');
      })
      .catch(function (error) {
        notify((error && error.message) || '网络错误，请重试', 'danger');
      })
      .finally(function () {
        matchingButtons.forEach(function (matchingButton) {
          setPending(matchingButton, false);
        });
      });
  });
})();