/**
 * AKSRT Admin AI SEO — generate button for post/term SEO fields
 */
(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') || $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;
  }

  document.addEventListener('click', function (e) {
    var btn = e.target.closest('.aksrt-ai-seo-generate');
    if (!btn) return;
    e.preventDefault();

    if (btn.classList.contains('is-loading') || btn.disabled) return;

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

    var original = btn.textContent;
    btn.classList.add('is-loading');
    btn.textContent = I18N.generating || '生成中…';

    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) {
        btn.classList.remove('is-loading');
        btn.textContent = original;

        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(btn, msg, 'error');
          return;
        }

        var data = res.json.data || {};
        if (type === 'term') fillTerm(data);
        else fillPost(data);

        var errors = collectErrors(data);
        if (errors.length) {
          notify(btn, errors.join('；'), 'error');
        } else {
          notify(btn, I18N.success || '已填入 SEO 字段，请检查后更新保存', 'ok');
        }
      })
      .catch(function () {
        btn.classList.remove('is-loading');
        btn.textContent = original;
        notify(btn, I18N.failed || '生成失败', 'error');
      });
  });
})();