/**
 * AKSRT Admin AI SEO — SEO generate + summary → excerpt
 */
(function () {
  'use strict';

  if (!window.aksrtAiSeo) return;

  var CFG = window.aksrtAiSeo;
  var REST = (CFG.restUrl || '/wp-json/aksrt/v1').replace(/\/$/, '');
  var NONCE = CFG.nonce || '';
  var I18N = CFG.i18n || {};

  function notify($btn, msg, type) {
    var wrap = $btn.closest('.aksrt-seo-meta-box, td, .form-field, p, .aksrt-ai-summary-row') || $btn.parentNode;
    if (!wrap) return;
    var old = wrap.querySelector('.aksrt-ai-seo-msg');
    if (old) old.remove();
    var el = document.createElement('span');
    el.className = 'aksrt-ai-seo-msg ' + (type === 'error' ? 'is-error' : 'is-ok');
    el.textContent = msg;
    wrap.appendChild(el);
    setTimeout(function () {
      if (el.parentNode) el.parentNode.removeChild(el);
    }, 8000);
  }

  function fillPost(data) {
    var map = {
      title: 'aksrt_seo_title',
      keywords: 'aksrt_seo_keywords',
      description: 'aksrt_seo_description',
    };
    Object.keys(map).forEach(function (key) {
      var field = data[key] || {};
      if (!field.content) return;
      var input = document.getElementById(map[key]) || document.querySelector('[name="' + map[key] + '"]');
      if (input) input.value = field.content;
    });
  }

  function fillTerm(data) {
    var map = {
      title: '.aksrt-term-seo-title, #aksrt_seo_title',
      keywords: '.aksrt-term-seo-keywords, #aksrt_seo_keywords',
      description: '.aksrt-term-seo-description, #aksrt_seo_description',
    };
    Object.keys(map).forEach(function (key) {
      var field = data[key] || {};
      if (!field.content) return;
      var input = document.querySelector(map[key]);
      if (input) input.value = field.content;
    });
  }

  function collectErrors(data) {
    var errors = [];
    ['title', 'keywords', 'description'].forEach(function (key) {
      if (data[key] && data[key].error) errors.push(data[key].error);
    });
    return errors;
  }

  function getEditorTitle() {
    var titleInput = document.getElementById('title');
    if (titleInput && titleInput.value) return titleInput.value.trim();
    // Block editor
    try {
      if (window.wp && wp.data && wp.data.select) {
        var ed = wp.data.select('core/editor');
        if (ed && ed.getEditedPostAttribute) {
          return String(ed.getEditedPostAttribute('title') || '').trim();
        }
      }
    } catch (e) { /* ignore */ }
    return '';
  }

  function getEditorContent() {
    var content = '';
    var ta = document.getElementById('content');
    if (ta && ta.value) content = ta.value;
    try {
      if (window.wp && wp.data && wp.data.select) {
        var ed = wp.data.select('core/editor');
        if (ed && ed.getEditedPostContent) {
          var blockContent = ed.getEditedPostContent();
          if (blockContent) content = blockContent;
        }
      }
    } catch (e) { /* ignore */ }
    // Strip tags for length check / API
    var div = document.createElement('div');
    div.innerHTML = content || '';
    return (div.textContent || div.innerText || content || '').trim();
  }

  function setExcerptValue(summary) {
    if (!summary) return false;

    // Classic: #excerpt
    var classic = document.getElementById('excerpt');
    if (classic) {
      classic.value = summary;
      classic.dispatchEvent(new Event('input', { bubbles: true }));
      classic.dispatchEvent(new Event('change', { bubbles: true }));
      return true;
    }

    // Block editor excerpt attribute
    try {
      if (window.wp && wp.data && wp.data.dispatch) {
        var d = wp.data.dispatch('core/editor');
        if (d && d.editPost) {
          d.editPost({ excerpt: summary });
          return true;
        }
      }
    } catch (e) { /* ignore */ }

    // Fallback name selector
    var named = document.querySelector('textarea[name="excerpt"]');
    if (named) {
      named.value = summary;
      named.dispatchEvent(new Event('input', { bubbles: true }));
      return true;
    }
    return false;
  }

  function setLoading(btn, on, original) {
    if (on) {
      btn.classList.add('is-loading');
      btn.textContent = I18N.generating || '生成中…';
    } else {
      btn.classList.remove('is-loading');
      btn.textContent = original;
    }
  }

  document.addEventListener('click', function (e) {
    // SEO generate
    var seoBtn = e.target.closest('.aksrt-ai-seo-generate');
    if (seoBtn) {
      e.preventDefault();
      if (seoBtn.classList.contains('is-loading') || seoBtn.disabled) return;

      var type = seoBtn.getAttribute('data-type') || 'post';
      var id = parseInt(seoBtn.getAttribute('data-id') || '0', 10);
      if (!id) {
        notify(seoBtn, I18N.needSave || '请先保存后再生成 SEO', 'error');
        return;
      }
      if (CFG.ai && CFG.ai.available === false) {
        notify(seoBtn, I18N.notAvailable || 'AI 未配置或未启用', 'error');
        return;
      }

      var seoOriginal = seoBtn.textContent;
      setLoading(seoBtn, true, seoOriginal);

      fetch(REST + '/ai/seo-generate', {
        method: 'POST',
        credentials: 'same-origin',
        headers: {
          'Content-Type': 'application/json',
          'X-WP-Nonce': NONCE,
        },
        body: JSON.stringify({ type: type, id: id }),
      })
        .then(function (r) {
          return r.json().then(function (json) {
            return { ok: r.ok, json: json };
          });
        })
        .then(function (res) {
          setLoading(seoBtn, false, seoOriginal);
          if (!res.ok || !res.json || res.json.success === false) {
            var msg =
              (res.json && (res.json.message || (res.json.data && res.json.data.message))) ||
              I18N.failed ||
              '生成失败';
            notify(seoBtn, msg, 'error');
            return;
          }
          var data = res.json.data || {};
          if (type === 'term') fillTerm(data);
          else fillPost(data);
          var errors = collectErrors(data);
          if (errors.length) notify(seoBtn, errors.join('；'), 'error');
          else notify(seoBtn, I18N.success || '已填入 SEO 字段，请检查后更新保存', 'ok');
        })
        .catch(function () {
          setLoading(seoBtn, false, seoOriginal);
          notify(seoBtn, I18N.failed || '生成失败', 'error');
        });
      return;
    }

    // Summary → excerpt
    var sumBtn = e.target.closest('.aksrt-ai-summary-generate');
    if (!sumBtn) return;
    e.preventDefault();
    if (sumBtn.classList.contains('is-loading') || sumBtn.disabled) return;

    if (CFG.ai && CFG.ai.available === false) {
      notify(sumBtn, I18N.notAvailable || 'AI 未配置或未启用', 'error');
      return;
    }

    var content = getEditorContent();
    if (!content) {
      notify(sumBtn, I18N.needContent || '请先填写正文内容', 'error');
      return;
    }

    var sumOriginal = sumBtn.textContent;
    setLoading(sumBtn, true, sumOriginal);

    fetch(REST + '/ai/summary-suggest', {
      method: 'POST',
      credentials: 'same-origin',
      headers: {
        'Content-Type': 'application/json',
        'X-WP-Nonce': NONCE,
      },
      body: JSON.stringify({
        title: getEditorTitle(),
        content: content,
        max_length: 200,
      }),
    })
      .then(function (r) {
        return r.json().then(function (json) {
          return { ok: r.ok, json: json };
        });
      })
      .then(function (res) {
        setLoading(sumBtn, false, sumOriginal);
        if (!res.ok || !res.json || res.json.success === false) {
          var msg =
            (res.json && (res.json.message || (res.json.data && res.json.data.message))) ||
            I18N.failed ||
            '生成失败';
          notify(sumBtn, msg, 'error');
          return;
        }
        var summary = (res.json.data && res.json.data.summary) || '';
        if (!setExcerptValue(summary)) {
          notify(sumBtn, I18N.noExcerptField || '未找到摘要字段，请展开「摘要」面板', 'error');
          return;
        }
        notify(sumBtn, I18N.summarySuccess || '已填入摘要字段，请检查后更新保存', 'ok');
      })
      .catch(function () {
        setLoading(sumBtn, false, sumOriginal);
        notify(sumBtn, I18N.failed || '生成失败', 'error');
      });
  });
})();