/**
 * AKSRT Front Submit
 *
 * Handles front-end post submission, draft save/load,
 * editor toolbar, cover preview, and form protection.
 *
 * @package AKSRT
 */

(function () {
  'use strict';

  var i18n = (window.aksrtSubmitData && window.aksrtSubmitData.i18n) || {};
  var ajaxUrl = (window.aksrtSubmitData && window.aksrtSubmitData.ajaxUrl) || '/wp-admin/admin-ajax.php';
  var nonce = (window.aksrtSubmitData && window.aksrtSubmitData.nonce) || '';
  var restUrl = ((window.aksrtSubmitData && window.aksrtSubmitData.restUrl) || '/wp-json/aksrt/v1').replace(/\/$/, '');
  var restNonce = (window.aksrtSubmitData && window.aksrtSubmitData.restNonce) || '';
  var aiCfg = (window.aksrtSubmitData && window.aksrtSubmitData.ai) || {};

  var FRONT_SUBMIT = {
    form: null,
    isDirty: false,
    isSubmitting: false,

    init: function () {
      this.form = document.getElementById('aksrt-submit-form');
      if (!this.form) return;

      this.bindDirtyTracking();
      this.bindSubmit();
      this.bindDraftSave();
      this.bindDraftDelete();
      this.bindEditorToolbar();
      this.bindCoverPreview();
      this.bindWordCount();
      this.bindLeaveWarning();
      this.bindAiAssist();
    },

    /**
     * Track form changes
     */
    bindDirtyTracking: function () {
      var self = this;
      this.form.addEventListener('input', function () {
        self.isDirty = true;
        self.form.setAttribute('data-dirty', 'true');
      });
    },

    /**
     * Leave page warning
     */
    bindLeaveWarning: function () {
      var self = this;
      window.addEventListener('beforeunload', function (e) {
        if (self.isDirty && !self.isSubmitting) {
          e.preventDefault();
          e.returnValue = i18n.confirmLeave || '';
        }
      });
    },

    /**
     * Form submission
     */
    bindSubmit: function () {
      var self = this;
      this.form.addEventListener('submit', function (e) {
        e.preventDefault();
        if (self.isSubmitting) return;

        var submitBtn = document.getElementById('aksrt-submit-btn');
        var statusInput = document.getElementById('submit-status');
        statusInput.value = 'pending';

        self.submitForm(submitBtn, 'pending');
      });
    },

    /**
     * Draft save
     */
    bindDraftSave: function () {
      var self = this;
      var draftBtn = document.getElementById('aksrt-save-draft');
      if (!draftBtn) return;

      draftBtn.addEventListener('click', function () {
        if (self.isSubmitting) return;
        var statusInput = document.getElementById('submit-status');
        statusInput.value = 'draft';
        self.submitForm(draftBtn, 'draft');
      });
    },

    /**
     * Submit form via AJAX
     */
    submitForm: function (btn, status) {
      var self = this;
      var formData = new FormData(this.form);
      formData.append('action', 'aksrt_submit_post');
      formData.append('_nonce', nonce);

      var originalText = btn.innerHTML;
      btn.disabled = true;
      btn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> ' + (status === 'draft' ? (i18n.saving || '保存中...') : (i18n.submitting || '提交中...'));
      self.isSubmitting = true;

      fetch(ajaxUrl, {
        method: 'POST',
        body: formData,
        credentials: 'same-origin',
      })
        .then(function (res) { return res.json(); })
        .then(function (data) {
          if (data.success) {
            self.isDirty = false;
            self.form.setAttribute('data-dirty', 'false');
            btn.innerHTML = '<i class="fas fa-check"></i> ' + (data.data && data.data.message ? data.data.message : (status === 'draft' ? (i18n.saved || '草稿已保存') : (i18n.submitted || '投稿已提交')));
            btn.classList.add('is-success');

            if (status === 'pending' && data.data && data.data.redirect) {
              setTimeout(function () { window.location.href = data.data.redirect; }, 1500);
            } else if (status === 'draft') {
              // Reload to update draft list
              setTimeout(function () { window.location.reload(); }, 1000);
            }
          } else {
            alert(data.data && data.data.message ? data.data.message : (i18n.error || '操作失败'));
            btn.disabled = false;
            btn.innerHTML = originalText;
          }
        })
        .catch(function () {
          alert(i18n.error || '操作失败，请重试');
          btn.disabled = false;
          btn.innerHTML = originalText;
        })
        .finally(function () {
          self.isSubmitting = false;
        });
    },

    /**
     * Draft delete
     */
    bindDraftDelete: function () {
      document.addEventListener('click', function (e) {
        var btn = e.target.closest('.aksrt-submit-drafts__delete');
        if (!btn) return;

        var draftId = btn.getAttribute('data-draft-id');
        if (!draftId) return;
        if (!confirm(i18n.confirmDelete || '确定要删除这个草稿吗？')) return;

        var formData = new FormData();
        formData.append('action', 'aksrt_delete_draft');
        formData.append('_nonce', nonce);
        formData.append('draft_id', draftId);

        fetch(ajaxUrl, {
          method: 'POST',
          body: formData,
          credentials: 'same-origin',
        })
          .then(function (res) { return res.json(); })
          .then(function (data) {
            if (data.success) {
              var item = btn.closest('.aksrt-submit-drafts__item');
              if (item) item.remove();
            } else {
              alert(data.data && data.data.message ? data.data.message : '删除失败');
            }
          })
          .catch(function () { alert('删除失败'); });
      });
    },

    /**
     * Editor toolbar actions
     */
    bindEditorToolbar: function () {
      var textarea = document.getElementById('submit-content');
      if (!textarea) return;

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

        var action = btn.getAttribute('data-action');
        var form = btn.closest('.aksrt-submit-form');
        if (!form) return;
        var ta = form.querySelector('textarea');
        if (!ta) return;

        switch (action) {
          case 'bold':
            FRONT_SUBMIT.wrapSelection(ta, '**');
            break;
          case 'italic':
            FRONT_SUBMIT.wrapSelection(ta, '*');
            break;
          case 'code':
            var sel = ta.value.substring(ta.selectionStart, ta.selectionEnd);
            if (sel.indexOf('\n') >= 0) {
              FRONT_SUBMIT.insertAtCursor(ta, '```\n', '\n```');
            } else {
              FRONT_SUBMIT.wrapSelection(ta, '`');
            }
            break;
          case 'link':
            FRONT_SUBMIT.askUrl(btn, '链接地址', function (url) {
              if (url) {
                var linkText = ta.value.substring(ta.selectionStart, ta.selectionEnd) || '链接文字';
                FRONT_SUBMIT.insertAtCursor(ta, '[' + linkText + '](' + url + ')');
              }
            });
            break;
          case 'image':
            FRONT_SUBMIT.askUrl(btn, '图片地址', function (url) {
              if (url) {
                FRONT_SUBMIT.insertAtCursor(ta, '![图片](' + url + ')');
              }
            });
            break;
          case 'quote':
            FRONT_SUBMIT.insertAtCursor(ta, '> ', '\n');
            break;
          case 'heading':
            FRONT_SUBMIT.insertAtCursor(ta, '## ', '\n');
            break;
          case 'list':
            FRONT_SUBMIT.insertAtCursor(ta, '- ', '\n');
            break;
        }
      });
    },

    askUrl: function (anchor, placeholder, callback) {
      var existing = document.querySelector('.aksrt-inline-url-input');
      if (existing) existing.remove();

      var input = document.createElement('input');
      input.type = 'url';
      input.className = 'aksrt-inline-url-input';
      input.placeholder = placeholder || 'https://';
      input.value = 'https://';
      input.style.cssText = 'display:block;width:100%;max-width:320px;margin:4px 0;padding:6px 10px;border:1px solid #dce3ec;border-radius:8px;font-size:13px;';

      var parent = anchor.parentElement;
      parent.insertBefore(input, anchor.nextSibling);
      input.focus();
      input.select();

      function done() {
        var val = input.value.trim();
        input.remove();
        callback(val);
      }

      input.addEventListener('keydown', function (e) {
        if (e.key === 'Enter') { e.preventDefault(); done(); }
        if (e.key === 'Escape') { input.remove(); callback(''); }
      });
      input.addEventListener('blur', function () { done(); });
    },

    insertAtCursor: function (textarea, before, after) {
      var start = textarea.selectionStart;
      var end = textarea.selectionEnd;
      var text = textarea.value;
      var selected = text.substring(start, end);
      var replacement = before + (selected || '') + (after || '');
      textarea.value = text.substring(0, start) + replacement + text.substring(end);
      textarea.focus();
      var newPos = start + before.length + selected.length;
      textarea.setSelectionRange(newPos, newPos);
      textarea.dispatchEvent(new Event('input', { bubbles: true }));
    },

    wrapSelection: function (textarea, marker) {
      this.insertAtCursor(textarea, marker, marker);
    },

    /**
     * Cover image preview
     */
    bindCoverPreview: function () {
      var thumbInput = document.getElementById('submit-thumbnail');
      var previewWrap = document.getElementById('cover-preview');
      var previewImg = document.getElementById('cover-preview-img');
      var removeBtn = document.getElementById('cover-remove');

      if (!thumbInput || !previewWrap || !previewImg) return;

      thumbInput.addEventListener('change', function () {
        var url = thumbInput.value.trim();
        if (url && /^https?:\/\//.test(url)) {
          previewImg.src = url;
          previewWrap.style.display = 'flex';
          previewImg.onerror = function () { previewWrap.style.display = 'none'; };
        } else {
          previewWrap.style.display = 'none';
        }
      });

      if (removeBtn) {
        removeBtn.addEventListener('click', function () {
          thumbInput.value = '';
          previewWrap.style.display = 'none';
          thumbInput.dispatchEvent(new Event('input', { bubbles: true }));
        });
      }

      // Media library picker
      var pickBtn = document.getElementById('aksrt-pick-cover');
      if (pickBtn && window.wp && window.wp.media) {
        pickBtn.addEventListener('click', function (e) {
          e.preventDefault();
          var mediaFrame = wp.media({
            title: '选择封面图',
            button: { text: '使用此图片' },
            multiple: false,
            library: { type: 'image' },
          });
          mediaFrame.on('select', function () {
            var attachment = mediaFrame.state().get('selection').first().toJSON();
            thumbInput.value = attachment.url;
            previewImg.src = attachment.url;
            previewWrap.style.display = 'flex';
            thumbInput.dispatchEvent(new Event('input', { bubbles: true }));
          });
          mediaFrame.open();
        });
      }
    },

    /**
     * Word count
     */
    bindWordCount: function () {
      var contentEl = document.getElementById('submit-content');
      var countEl = document.getElementById('submit-word-count');
      if (!contentEl || !countEl) return;

      var updateCount = function () {
        var text = contentEl.value.replace(/<[^>]*>/g, '').trim();
        var chars = text.length;
        var words = text ? text.split(/\s+/).length : 0;
        countEl.textContent = chars + ' 字 · ~' + words + ' 词';
      };

      contentEl.addEventListener('input', updateCount);
      updateCount();
    },

    /**
     * AI 摘要 / 标签辅助（仅建议回填，不自动提交）
     */
    bindAiAssist: function () {
      var self = this;
      if (!aiCfg.available) return;

      var buttons = this.form.querySelectorAll('.aksrt-ai-assist-btn');
      if (!buttons.length) return;

      buttons.forEach(function (btn) {
        btn.hidden = false;
        btn.addEventListener('click', function (e) {
          e.preventDefault();
          var action = btn.getAttribute('data-ai-action');
          if (action === 'summary') self.runAiSummary(btn);
          if (action === 'tags') self.runAiTags(btn);
        });
      });
    },

    getSubmitContent: function () {
      var titleEl = document.getElementById('submit-title');
      var contentEl = document.getElementById('submit-content');
      return {
        title: titleEl ? titleEl.value.trim() : '',
        content: contentEl ? contentEl.value.trim() : '',
      };
    },

    runAiSummary: function (btn) {
      var data = this.getSubmitContent();
      if (!data.content) {
        alert(i18n.needContent || '请先填写正文内容');
        return;
      }
      this.aiRequest(btn, '/ai/summary-suggest', {
        title: data.title,
        content: data.content,
        max_length: 200,
      }, function (payload) {
        var summary = payload && payload.summary ? String(payload.summary) : '';
        var el = document.getElementById('submit-excerpt');
        if (el && summary) {
          el.value = summary;
          el.dispatchEvent(new Event('input', { bubbles: true }));
        }
      });
    },

    runAiTags: function (btn) {
      var data = this.getSubmitContent();
      if (!data.content && !data.title) {
        alert(i18n.needContent || '请先填写正文内容');
        return;
      }
      this.aiRequest(btn, '/ai/tags-suggest', {
        title: data.title,
        content: data.content,
      }, function (payload) {
        var tags = payload && Array.isArray(payload.tags) ? payload.tags : [];
        var el = document.getElementById('submit-tags');
        if (el && tags.length) {
          el.value = tags.join(', ');
          el.dispatchEvent(new Event('input', { bubbles: true }));
        }
      });
    },

    aiRequest: function (btn, path, body, onSuccess) {
      if (btn.getAttribute('data-loading') === '1') return;
      var original = btn.textContent;
      btn.setAttribute('data-loading', '1');
      btn.textContent = i18n.aiGenerating || '生成中…';

      fetch(restUrl + path, {
        method: 'POST',
        credentials: 'same-origin',
        headers: {
          'Content-Type': 'application/json',
          'X-WP-Nonce': restNonce,
        },
        body: JSON.stringify(body || {}),
      })
        .then(function (r) {
          return r.json().then(function (json) {
            return { ok: r.ok, json: json };
          });
        })
        .then(function (res) {
          btn.removeAttribute('data-loading');
          btn.textContent = original;
          if (!res.ok || !res.json || res.json.success === false) {
            var msg = (res.json && res.json.message) || i18n.aiFailed || 'AI 生成失败';
            alert(msg);
            return;
          }
          onSuccess(res.json.data || {});
        })
        .catch(function () {
          btn.removeAttribute('data-loading');
          btn.textContent = original;
          alert(i18n.aiFailed || 'AI 生成失败');
        });
    },
  };

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