/**
 * AKSRT Follow — 前台关注交互
 *
 * 监听 [data-aksrt-follow] 按钮点击，切换关注状态。
 *
 * @package AKSRT
 */
(function () {
  'use strict';

  var API_ROOT = (window.aksrtData && window.aksrtData.apiUrl) || '/wp-json/aksrt/v1';
  var NONCE    = (window.aksrtData && window.aksrtData.restNonce) || '';

  function initFollowButtons() {
    document.addEventListener('click', function (e) {
      var btn = e.target.closest('[data-aksrt-follow]');
      if (!btn) return;
      e.preventDefault();

      var targetUserId = parseInt(btn.getAttribute('data-aksrt-follow'));
      if (!targetUserId) return;

      btn.disabled = true;

      fetch(API_ROOT + '/follow/toggle', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'X-WP-Nonce': NONCE,
        },
        body: JSON.stringify({ target_user_id: targetUserId }),
      })
        .then(function (res) { return res.json(); })
        .then(function (result) {
          if (result.success && result.data) {
            var isFollowing = result.data.is_following;
            updateFollowButton(btn, isFollowing, result.data.follower_count);
          } else {
            showToast(result.message || '操作失败', 'error');
          }
        })
        .catch(function () {
          showToast('网络错误，请重试', 'error');
        })
        .finally(function () {
          btn.disabled = false;
        });
    });

    // Check initial follow status for all follow buttons
    document.querySelectorAll('[data-aksrt-follow]').forEach(function (btn) {
      var targetUserId = parseInt(btn.getAttribute('data-aksrt-follow'));
      if (!targetUserId) return;

      fetch(API_ROOT + '/follow/status?target_user_id=' + targetUserId, {
        headers: { 'X-WP-Nonce': NONCE },
      })
        .then(function (res) { return res.json(); })
        .then(function (result) {
          if (result.success && result.data) {
            updateFollowButton(btn, result.data.is_following, result.data.follower_count);
          }
        })
        .catch(function () { /* silent */ });
    });
  }

  function updateFollowButton(btn, isFollowing, count) {
    var icon = btn.querySelector('i');
    var text = btn.querySelector('span');
    function setLabel(label) {
      if (text) {
        text.textContent = label;
        return;
      }
      // Fallback when markup has bare text nodes next to the icon.
      var nodes = Array.prototype.slice.call(btn.childNodes);
      var textNode = nodes.filter(function (n) { return n.nodeType === 3 && n.textContent.trim() !== ''; })[0];
      if (textNode) {
        textNode.textContent = ' ' + label + ' ';
      }
    }

    if (isFollowing) {
      btn.classList.add('is-following');
      if (icon) icon.className = 'fas fa-heart';
      setLabel('已关注');
      btn.title = '点击取消关注';
    } else {
      btn.classList.remove('is-following');
      if (icon) icon.className = 'far fa-heart';
      setLabel('关注');
      btn.title = '关注该用户';
    }

    // Update follower count display if exists
    var countEl = document.querySelector('.aksrt-user-home__stat-value[data-followers]');
    if (countEl && count !== undefined) {
      countEl.textContent = count;
    }
  }

  function showToast(msg, type) {
    var toast = document.createElement('div');
    toast.textContent = msg;
    toast.style.cssText = 'position:fixed;top:20px;left:50%;transform:translateX(-50%);padding:12px 24px;border-radius:6px;color:#fff;font-size:14px;z-index:10000;transition:opacity 0.3s;';
    toast.style.background = type === 'error' ? '#e74c3c' : '#27ae60';
    document.body.appendChild(toast);
    setTimeout(function () {
      toast.style.opacity = '0';
      setTimeout(function () { toast.remove(); }, 300);
    }, 3000);
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', initFollowButtons);
  } else {
    initFollowButtons();
  }
})();