/**
 * AKSRT message center DOM navigation.
 *
 * @package AKSRT
 */
(function () {
  'use strict';

  var root = document.querySelector('[data-message-center]');
  if (!root) return;

  var nonce = typeof aksrtData !== 'undefined' ? aksrtData.nonce : '';
  var ajaxUrl = typeof aksrtData !== 'undefined' ? aksrtData.ajaxUrl : '/wp-admin/admin-ajax.php';
  var content = root.querySelector('[data-message-content]');
  var nav = root.querySelector('[data-message-nav]');
  var state = {
    view: root.dataset.view || 'unread',
    page: 1,
    detail: 0,
    paginateType: root.dataset.paginateType || 'ajax_lists',
  };
  var pollInterval = 60000;

  function post(action, data) {
    var body = new URLSearchParams({ action: action, nonce: nonce });
    Object.keys(data || {}).forEach(function (key) {
      var value = data[key];
      if (Array.isArray(value)) {
        value.forEach(function (item) { body.append(key + '[]', item); });
      } else {
        body.append(key, value);
      }
    });
    return fetch(ajaxUrl, { method: 'POST', body: body, credentials: 'same-origin' })
      .then(function (response) { return response.json(); });
  }

  function routeFor(view) {
    var link = nav.querySelector('[data-message-view="' + view + '"]');
    return link ? link.href : window.location.href;
  }

  function updateHeaderBadge(unread) {
    var count = Math.max(0, Number(unread) || 0);
    var headerBadge = document.querySelector('.aksrt-notification-badge');
    var avatarDot = document.querySelector('.nav-user__dot');
    if (headerBadge) {
      headerBadge.textContent = String(count);
      headerBadge.style.display = count > 0 ? '' : 'none';
    }
    if (avatarDot) avatarDot.style.display = count > 0 ? '' : 'none';
  }

  function renderError(message) {
    content.innerHTML = '<div class="messages-empty"><span class="messages-empty__icon"><i class="fa fas fa-exclamation-circle"></i></span><p class="messages-empty__text"></p></div>';
    content.querySelector('.messages-empty__text').textContent = message || '加载失败，请稍后重试';
  }

  function appendMessagePage(markup) {
    var incoming = document.createElement('div');
    incoming.innerHTML = markup;
    var currentList = content.querySelector('.messages-list');
    var incomingList = incoming.querySelector('.messages-list');
    if (!currentList || !incomingList) {
      content.innerHTML = markup;
      return null;
    }

    var existingIds = new Set();
    currentList.querySelectorAll('[data-notification-id]').forEach(function (item) {
      existingIds.add(item.dataset.notificationId);
    });
    var firstAdded = null;
    incomingList.querySelectorAll('.message-item').forEach(function (item) {
      if (existingIds.has(item.dataset.notificationId)) return;
      if (!firstAdded) firstAdded = item;
      currentList.appendChild(item);
    });

    var currentPagination = content.querySelector('.messages-pagination');
    var incomingPagination = incoming.querySelector('.messages-pagination');
    if (currentPagination) currentPagination.remove();
    if (incomingPagination) content.appendChild(incomingPagination);
    return firstAdded;
  }

  function load(next, options) {
    var requested = {
      view: next.view || state.view,
      page: next.page || 1,
      detail: next.detail || 0,
    };
    var settings = options || {};
    root.classList.add('is-loading');
    content.setAttribute('aria-busy', 'true');

    return post('aksrt_load_message_center', {
      view: requested.view,
      page: requested.page,
      notification_id: requested.detail,
    }).then(function (result) {
      if (!result.success || !result.data) {
        throw new Error(result.data && result.data.message ? result.data.message : '加载失败，请稍后重试');
      }
      requested.paginateType = result.data.paginate_type || state.paginateType;
      state = requested;
      root.dataset.view = state.view;
      root.dataset.paginateType = state.paginateType;
      nav.innerHTML = result.data.nav;
      var firstAdded = null;
      if (settings.append && state.paginateType === 'ajax_lists') {
        firstAdded = appendMessagePage(result.data.content);
      } else {
        content.innerHTML = result.data.content;
      }
      updateHeaderBadge(result.data.unread);

      if (settings.history === 'push') {
        window.history.pushState(state, '', routeFor(state.view));
      } else if (settings.history === 'replace') {
        window.history.replaceState(state, '', routeFor(state.view));
      }
      if (firstAdded) {
        firstAdded.setAttribute('tabindex', '-1');
        firstAdded.focus({ preventScroll: true });
      } else {
        content.focus({ preventScroll: true });
      }
    }).catch(function (error) {
      renderError(error.message);
    }).finally(function () {
      root.classList.remove('is-loading');
      content.removeAttribute('aria-busy');
    });
  }

  function reloadList() {
    return load({ view: state.view, page: state.page, detail: 0 });
  }

  document.addEventListener('click', function (event) {
    var tab = event.target.closest('[data-message-view]');
    if (!tab || !root.contains(tab) || event.button !== 0 || event.metaKey || event.ctrlKey || event.shiftKey || event.altKey) return;
    event.preventDefault();
    load({ view: tab.dataset.messageView, page: 1, detail: 0 }, { history: 'push' });
  });

  document.addEventListener('click', function (event) {
    var button = event.target.closest('.js-msg-detail');
    if (!button || !root.contains(button)) return;
    event.preventDefault();
    load({ view: button.dataset.view || state.view, page: state.page, detail: button.dataset.id });
  });

  document.addEventListener('click', function (event) {
    var button = event.target.closest('[data-message-back]');
    if (!button || !root.contains(button)) return;
    load({ view: button.dataset.view || state.view, page: state.page, detail: 0 });
  });

  document.addEventListener('click', function (event) {
    var button = event.target.closest('[data-message-page]');
    if (!button || !root.contains(button)) return;
    event.preventDefault();
    load({ view: state.view, page: button.dataset.messagePage, detail: 0 });
  });

  document.addEventListener('click', function (event) {
    var button = event.target.closest('[data-message-next-page]');
    if (!button || !root.contains(button)) return;
    event.preventDefault();
    load(
      { view: state.view, page: button.dataset.messageNextPage, detail: 0 },
      { append: true }
    );
  });

  document.addEventListener('click', function (event) {
    var button = event.target.closest('.js-msg-mark-read');
    if (!button || !root.contains(button)) return;
    post('aksrt_mark_notification_read', { notification_id: button.dataset.id }).then(function (result) {
      if (result.success) reloadList();
    });
  });

  document.addEventListener('click', function (event) {
    var button = event.target.closest('.js-msg-delete');
    if (!button || !root.contains(button)) return;
    post('aksrt_delete_notification', { notification_id: button.dataset.id }).then(function (result) {
      if (result.success) reloadList();
    });
  });

  document.addEventListener('click', function (event) {
    var button = event.target.closest('.js-msg-mark-all-read');
    if (!button || !root.contains(button)) return;
    post('aksrt_mark_notification_read', { mark_all: '1' }).then(function (result) {
      if (result.success) reloadList();
    });
  });

  document.addEventListener('click', function (event) {
    var button = event.target.closest('.js-msg-clear-read');
    if (!button || !root.contains(button)) return;
    var ids = [];
    root.querySelectorAll('.message-item:not(.is-unread)[data-notification-id]').forEach(function (item) {
      if (/^\d+$/.test(item.dataset.notificationId)) ids.push(item.dataset.notificationId);
    });
    if (!ids.length) return;
    post('aksrt_delete_notifications', { notification_ids: ids }).then(function (result) {
      if (result.success) reloadList();
    });
  });

  window.addEventListener('popstate', function (event) {
    var previous = event.state;
    if (previous && previous.view) {
      load(previous);
    }
  });

  window.history.replaceState(state, '', routeFor(state.view));
  window.setInterval(function () {
    post('aksrt_check_new_notifications', {}).then(function (result) {
      if (result.success && result.data) updateHeaderBadge(result.data.unread);
    }).catch(function () {});
  }, pollInterval);
})();