/**
 * Comment expand tools — shortcode inserts and comment image upload.
 */
(function () {
  'use strict';

  var uploadStates = new WeakMap();

  function findTextarea(from) {
    var form = from && from.closest ? from.closest('form') : null;
    if (form) {
      return form.querySelector('textarea.grin, textarea#comment, textarea[name="comment"]');
    }
    return document.querySelector('#comment, textarea.grin');
  }

  function insertAtCursor(textarea, value) {
    if (!textarea) return;
    var start = textarea.selectionStart || 0;
    var end = textarea.selectionEnd || 0;
    var val = textarea.value || '';
    textarea.value = val.slice(0, start) + value + val.slice(end);
    var pos = start + value.length;
    textarea.selectionStart = textarea.selectionEnd = pos;
    textarea.focus();
    textarea.dispatchEvent(new Event('input'));
  }

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

  function showImageTab(trigger) {
    var selector = trigger.getAttribute('data-image-tab');
    var wrapper = trigger.closest('.comment-image-tabs');
    if (!selector || !wrapper) return null;
    var target = wrapper.querySelector(selector);
    if (!target) return null;

    wrapper.querySelectorAll('.tab-pane').forEach(function (pane) {
      pane.classList.remove('in', 'active');
    });
    target.classList.add('in', 'active');
    return target;
  }

  function getUploadState(form) {
    var state = uploadStates.get(form);
    if (state) return state;

    var preview = form.querySelector('.preview');
    state = {
      file: null,
      uploading: false,
      previewHtml: preview ? preview.innerHTML : ''
    };
    uploadStates.set(form, state);
    return state;
  }

  function resetUpload(form) {
    var state = getUploadState(form);
    var input = form.querySelector('.comment-image-file');
    var preview = form.querySelector('.preview');

    state.file = null;
    state.uploading = false;
    if (input) {
      input.disabled = false;
      input.value = '';
    }
    if (preview) preview.innerHTML = state.previewHtml;
  }

  function restoreUploadButton(button, html) {
    button.disabled = false;
    button.innerHTML = html;
  }

  function validateImage(input, file) {
    var accepts = (input.getAttribute('accept') || '')
      .split(',')
      .map(function (type) { return type.trim().toLowerCase(); })
      .filter(Boolean);
    var fileType = (file.type || '').toLowerCase();
    if (accepts.length && accepts.indexOf(fileType) === -1) {
      notify('图片格式错误：' + file.name, 'danger');
      return false;
    }

    var maxSize = Number((window.aksrtData || {}).commentUploadMaxSize) || 0;
    if (maxSize > 0 && file.size > maxSize) {
      notify('图片大小不能超过 ' + Math.round(maxSize / 1024 / 1024) + 'MB', 'danger');
      return false;
    }
    return true;
  }

  function previewImage(form, file) {
    var preview = form.querySelector('.preview');
    if (!preview) return;
    if (typeof FileReader === 'undefined') {
      notify('当前浏览器不支持图片预览', 'danger');
      return;
    }

    var reader = new FileReader();
    reader.onload = function (event) {
      if (getUploadState(form).file !== file) return;
      var image = document.createElement('img');
      image.className = 'fit-cover';
      image.alt = '';
      image.src = event.target.result;
      preview.innerHTML = '';
      preview.appendChild(image);
    };
    reader.readAsDataURL(file);
  }

  function parseUploadResponse(xhr) {
    try {
      return JSON.parse(xhr.responseText || '{}');
    } catch (error) {
      return null;
    }
  }

  function uploadImage(button) {
    var form = button.closest('.comment-image-upload');
    if (!form) return;

    var input = form.querySelector('.comment-image-file');
    var state = getUploadState(form);
    if (!input || !state.file) {
      notify('请先选择待上传的图片', 'danger');
      return;
    }
    if (state.uploading) return;

    var data = window.aksrtData || {};
    var uploadUrl = data.commentUploadUrl || '';
    if (!uploadUrl) {
      notify('图片上传服务不可用', 'danger');
      return;
    }

    var originalHtml = button.innerHTML;
    var formData = new FormData();
    formData.append('image', state.file, state.file.name);

    state.uploading = true;
    button.disabled = true;
    input.disabled = true;
    button.innerHTML = '<span class="miniupload-ing"><i class="loading mr3 c-white"></i><span class="loading-text c-white">上传中<count class="px12 ml3"></count></span><span class="progress progress-striped active"><span class="progress-bar progress-bar-success" role="progressbar" style="width:0"></span></span></span>';

    var xhr = new XMLHttpRequest();
    xhr.open('POST', uploadUrl, true);
    if (data.restNonce) xhr.setRequestHeader('X-WP-Nonce', data.restNonce);

    xhr.upload.onprogress = function (event) {
      if (!event.lengthComputable) return;
      var percent = Math.round((event.loaded / event.total) * 100);
      var count = button.querySelector('count');
      var progress = button.querySelector('.progress-bar');
      var loadingText = button.querySelector('.loading-text');
      if (count) count.textContent = percent + '%';
      if (progress) progress.style.width = percent + '%';
      if (percent >= 100 && loadingText) loadingText.firstChild.nodeValue = '处理中';
    };

    xhr.onload = function () {
      var response = parseUploadResponse(xhr);
      var url = response && response.success === true && response.data
        ? response.data.url
        : '';

      if (xhr.status < 200 || xhr.status >= 300 || typeof url !== 'string' || url.length < 6) {
        var message = response && response.message ? response.message : '图片上传失败';
        notify(message, 'danger');
        restoreUploadButton(button, originalHtml);
        resetUpload(form);
        return;
      }

      notify(response.message || '图片已上传', 'success');
      insertAtCursor(findTextarea(button), '[img=' + url + ']\n');
      restoreUploadButton(button, originalHtml);
      resetUpload(form);
    };

    xhr.onerror = function () {
      notify('网络错误，图片上传失败', 'danger');
      restoreUploadButton(button, originalHtml);
      resetUpload(form);
    };

    xhr.send(formData);
  }

  document.addEventListener('change', function (event) {
    var input = event.target && event.target.closest
      ? event.target.closest('.comment-image-file')
      : null;
    if (!input) return;

    var form = input.closest('.comment-image-upload');
    var file = input.files && input.files[0];
    if (!form || !file) return;
    if (!validateImage(input, file)) {
      resetUpload(form);
      return;
    }

    var state = getUploadState(form);
    state.file = file;
    previewImage(form, file);
    var button = form.querySelector('[data-comment-upload-submit]');
    if (button) uploadImage(button);
  });

  document.addEventListener('click', function (event) {
    var linkBtn = event.target && event.target.closest ? event.target.closest('.input-link-submit') : null;
    if (linkBtn) {
      event.preventDefault();
      var linkBox = linkBtn.closest('.dropdown-link');
      var linkTextarea = linkBox ? linkBox.querySelector('textarea.link-textarea') : null;
      var linkUrl = linkTextarea ? (linkTextarea.value || '').trim() : '';
      if (!/^https?:\/\/\S+$/i.test(linkUrl)) {
        notify('请输入有效链接地址', 'warning');
        return;
      }
      var linkTextInput = linkBox ? linkBox.querySelector('.link-text') : null;
      var linkText = linkTextInput ? linkTextInput.value || '' : '';
      insertAtCursor(findTextarea(linkBtn), '[link=' + linkUrl + ']' + (linkText.trim() || linkUrl) + '[/link]');
      if (linkTextarea) linkTextarea.value = '';
      if (linkTextInput) linkTextInput.value = '';
      var linkWrapper = linkBtn.closest('span.dropup');
      if (linkWrapper) linkWrapper.classList.remove('open');
      return;
    }

    var codeBtn = event.target && event.target.closest ? event.target.closest('.input-code-submit') : null;
    if (codeBtn) {
      event.preventDefault();
      var codeBox = codeBtn.closest('.dropdown-code, .input-expand-code');
      var codeTextarea = codeBox ? codeBox.querySelector('textarea') : null;
      var code = codeTextarea ? codeTextarea.value : '';
      if (!code || code.length < 2) {
        notify('请输入代码', 'warning');
        return;
      }
      insertAtCursor(findTextarea(codeBtn), '[code]\n' + code + '\n[/code]\n');
      if (codeTextarea) codeTextarea.value = '';
      var codeWrapper = codeBtn.closest('span.dropup');
      if (codeWrapper) codeWrapper.classList.remove('open');
      return;
    }

    var imageSubmit = event.target && event.target.closest ? event.target.closest('.input-image-submit') : null;
    if (imageSubmit) {
      event.preventDefault();
      var imageBox = imageSubmit.closest('.dropdown-image');
      var imageInput = imageBox ? imageBox.querySelector('.input-image-url') : null;
      var imageUrl = imageInput ? (imageInput.value || '').trim() : '';
      if (imageUrl.length < 6) {
        notify('请输入有效图片地址', 'warning');
        return;
      }
      insertAtCursor(findTextarea(imageSubmit), '[img=' + imageUrl + ']\n');
      return;
    }

    var uploadTab = event.target && event.target.closest ? event.target.closest('.input-image-upload-tab') : null;
    if (uploadTab) {
      event.preventDefault();
      var uploadPane = showImageTab(uploadTab);
      var uploadInput = uploadPane ? uploadPane.querySelector('.comment-image-file') : null;
      if (uploadInput) uploadInput.click();
      return;
    }

    var addressTab = event.target && event.target.closest ? event.target.closest('.input-image-address-tab') : null;
    if (addressTab) {
      event.preventDefault();
      showImageTab(addressTab);
      return;
    }

    var uploadButton = event.target && event.target.closest ? event.target.closest('[data-comment-upload-submit]') : null;
    if (uploadButton) {
      event.preventDefault();
      uploadImage(uploadButton);
    }
  });

  document.addEventListener('keydown', function (event) {
    if (!(event.ctrlKey || event.metaKey) || event.key !== 'Enter') return;
    var textarea = event.target;
    if (!textarea || textarea.id !== 'comment') return;
    var form = textarea.closest('#commentform');
    if (!form) return;
    event.preventDefault();
    var submit = form.querySelector('#submit, [type="submit"]');
    if (submit) submit.click();
  });
})();