/**
 * AKSRT Post Share
 *
 * Handles share dropdowns, social share targets, copy link,
 * and WeChat bridge handoff with QR fallback.
 *
 * @package AKSRT
 */

(function () {
  'use strict';

  function notify(message, type) {
    if (!message) return;
    if (typeof window.AksrtToast === 'function') {
      window.AksrtToast(message, type || 'info');
      return;
    }
    if (typeof window.showToast === 'function') {
      window.showToast(message, type || 'info');
      return;
    }
    if (typeof window.aksrtToast === 'function') {
      window.aksrtToast(message, type || 'info');
      return;
    }
    window.alert(message);
  }

  function getMetaContent(selectors) {
    for (var i = 0; i < selectors.length; i += 1) {
      var node = document.querySelector(selectors[i]);
      var content = node ? node.getAttribute('content') : '';
      if (content) return content;
    }
    return '';
  }

  function getPlatform(node) {
    if (!node) return '';
    return node.getAttribute('data-share-platform') || node.getAttribute('data-platform') || '';
  }

  function resolvePayload(node) {
    // Unified payload via the shared builder; fall back to local resolution
    // only if the builder script is unavailable.
    if (window.AksrtShareData && typeof window.AksrtShareData.resolve === 'function') {
      return window.AksrtShareData.resolve(node);
    }

    var dropdown = document.getElementById('share-dropdown');
    var source = node && typeof node.closest === 'function'
      ? node.closest('[data-share-url], [data-share-title], [data-share-desc], [data-share-image]')
      : null;
    var context = source || dropdown;

    function readAttr(name) {
      return (node && node.getAttribute(name)) || (context && context.getAttribute(name)) || '';
    }

    return {
      title: readAttr('data-share-title') || document.title,
      url: readAttr('data-share-url') || window.location.href,
      desc: readAttr('data-share-desc') || getMetaContent(['meta[property="og:description"]', 'meta[name="description"]']),
      text: readAttr('data-share-text') || '',
      image: readAttr('data-share-image') || getMetaContent(['meta[property="og:image"]']),
      qrcode: readAttr('data-share-qrcode') || ''
    };
  }

  function openWindow(url) {
    if (!url) return;
    window.open(url, '_blank', 'width=640,height=560,scrollbars=yes,resizable=yes');
  }

  function buildShareUrl(platform, payload) {
    switch (platform) {
      case 'weibo':
        return 'https://service.weibo.com/share/share.php?url=' + encodeURIComponent(payload.url) + '&title=' + encodeURIComponent(payload.title + (payload.text ? ' ' + payload.text : ''));
      case 'qq':
        return 'https://connect.qq.com/widget/shareqq/index.html?url=' + encodeURIComponent(payload.url) + '&title=' + encodeURIComponent(payload.title) + '&desc=' + encodeURIComponent(payload.desc || payload.text || '');
      case 'twitter':
        return 'https://x.com/intent/tweet?url=' + encodeURIComponent(payload.url) + '&text=' + encodeURIComponent(payload.title);
      case 'telegram':
        return 'https://t.me/share/url?url=' + encodeURIComponent(payload.url) + '&text=' + encodeURIComponent(payload.title);
      case 'linkedin':
        return 'https://www.linkedin.com/sharing/share-offsite/?url=' + encodeURIComponent(payload.url);
      default:
        return '';
    }
  }

  function fallbackCopy(text) {
    var textarea = document.createElement('textarea');
    textarea.value = text;
    textarea.style.cssText = 'position:fixed;left:-9999px;top:-9999px;opacity:0;';
    textarea.setAttribute('readonly', '');
    document.body.appendChild(textarea);
    try {
      textarea.select();
      textarea.setSelectionRange(0, textarea.value.length);
      if (!document.execCommand('copy')) {
        throw new Error('copy command failed');
      }
    } finally {
      document.body.removeChild(textarea);
    }
  }

  function copyLink(text) {
    if (navigator.clipboard && navigator.clipboard.writeText) {
      return navigator.clipboard.writeText(text).catch(function () {
        fallbackCopy(text);
      });
    }

    try {
      fallbackCopy(text);
      return Promise.resolve();
    } catch (error) {
      return Promise.reject(error);
    }
  }

  function initShareDropdown() {
    var trigger = document.getElementById('action-share-trigger');
    var dropdown = document.getElementById('share-dropdown');
    if (!trigger || !dropdown || dropdown.dataset.aksrtShareBound === '1') return;

    dropdown.dataset.aksrtShareBound = '1';

    var qrBox = document.getElementById('share-qrcode-box');
    var qrImage = document.getElementById('share-qrcode-image');

    function closeDropdown() {
      dropdown.setAttribute('aria-hidden', 'true');
      trigger.setAttribute('aria-expanded', 'false');
      if (window.AksrtShare && typeof window.AksrtShare.hideQrFallback === 'function') {
        window.AksrtShare.hideQrFallback(qrBox);
      } else if (qrBox) {
        qrBox.classList.remove('is-visible');
        qrBox.setAttribute('aria-hidden', 'true');
      }
    }

    function toggleDropdown() {
      var isOpen = dropdown.getAttribute('aria-hidden') === 'false';
      if (isOpen) {
        closeDropdown();
        return;
      }

      dropdown.setAttribute('aria-hidden', 'false');
      trigger.setAttribute('aria-expanded', 'true');
    }

    trigger.addEventListener('click', function (event) {
      event.preventDefault();
      event.stopPropagation();
      toggleDropdown();
    });

    document.addEventListener('click', function (event) {
      if (!trigger.contains(event.target) && !dropdown.contains(event.target)) {
        closeDropdown();
      }
    });

    document.addEventListener('keydown', function (event) {
      if (event.key === 'Escape') {
        closeDropdown();
      }
    });

    dropdown.addEventListener('click', function (event) {
      var item = event.target.closest('.share-item');
      if (!item) return;

      event.preventDefault();
      event.stopPropagation();

      handleShareAction(item, {
        qrBox: qrBox,
        qrImage: qrImage,
        closeDropdown: closeDropdown,
        withinDropdown: true
      });
    });
  }

  function handleWeixinShare(node, payload, options) {
    options = options || {};

    var share = window.AksrtShare;
    if (!share || typeof share.openWeixinShare !== 'function') {
      notify('微信分享模块未加载', 'error');
      return Promise.resolve({ mode: 'error' });
    }

    if (
      options.qrBox &&
      options.qrBox.classList.contains('is-visible') &&
      (!share.isWeixinEnv || !share.isWeixinEnv())
    ) {
      share.hideQrFallback(options.qrBox);
      return Promise.resolve({ mode: 'closed' });
    }

    return share.openWeixinShare({
      title: payload.title,
      url: payload.url,
      desc: payload.desc || payload.text || '',
      image: payload.image,
      qrBox: options.qrBox || null,
      qrImage: options.qrImage || null
    }).then(function (result) {
      if (result && result.message) {
        notify(result.message, result.mode === 'error' ? 'error' : (result.mode === 'bridge' ? 'success' : 'info'));
      }
      return result;
    });
  }

  function handleShareAction(node, options) {
    var platform = getPlatform(node);
    if (!platform) return Promise.resolve({ mode: 'noop' });

    var payload = resolvePayload(node);
    if (!payload.url) return Promise.resolve({ mode: 'noop' });

    if (platform === 'copy') {
      return copyLink(payload.url).then(function () {
        notify('链接已复制', 'success');
        if (options && typeof options.closeDropdown === 'function') {
          options.closeDropdown();
        }
        return { mode: 'copy' };
      }).catch(function () {
        notify('复制失败，请手动复制链接', 'error');
        return { mode: 'error' };
      });
    }

    if (platform === 'wechat') {
      return handleWeixinShare(node, payload, options).then(function (result) {
        if (result && result.mode !== 'qr' && result.mode !== 'error' && options && typeof options.closeDropdown === 'function') {
          options.closeDropdown();
        }
        return result;
      });
    }

    if (platform === 'poster') {
      if (window.AksrtPosterShare && typeof window.AksrtPosterShare.open === 'function') {
        window.AksrtPosterShare.open(payload);
        if (options && typeof options.closeDropdown === 'function') options.closeDropdown();
        return Promise.resolve({ mode: 'poster' });
      }
      notify('海报模块未加载', 'error');
      return Promise.resolve({ mode: 'error' });
    }

    var shareUrl = buildShareUrl(platform, payload);
    if (!shareUrl) {
      return Promise.resolve({ mode: 'noop' });
    }

    openWindow(shareUrl);
    if (options && typeof options.closeDropdown === 'function') {
      options.closeDropdown();
    }

    return Promise.resolve({ mode: 'window' });
  }

  function bindGenericShareButtons() {
    document.addEventListener('click', function (event) {
      var node = event.target.closest('[data-share-platform]');
      if (!node || node.closest('#share-dropdown')) return;

      event.preventDefault();
      handleShareAction(node, {});
    });

    document.addEventListener('click', function (event) {
      var node = event.target.closest('[data-share-copy]');
      if (!node) return;

      event.preventDefault();
      var url = node.getAttribute('data-share-url') || window.location.href;
      copyLink(url).then(function () {
        notify('链接已复制', 'success');
      }).catch(function () {
        notify('复制失败，请手动复制链接', 'error');
      });
    });
  }

  function init() {
    initShareDropdown();
    bindGenericShareButtons();
  }

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