/** 消息管理：详情、选择与批量操作、发送计数及角色群发确认。仅本页入队。 */
(function () {
  'use strict';

  var root = document.querySelector('.aksrt-messages-admin');
  if (!root) return;
  var compose = document.getElementById('aksrt-msg-compose');
  var detail = document.getElementById('aksrt-msg-detail');
  var confirmDialog = document.getElementById('aksrt-msg-confirm');
  if (!compose || !detail || !confirmDialog || typeof compose.showModal !== 'function') return;

  function text(element, key, values) {
    var value = element.getAttribute('data-i18n-' + key) || '';
    return value.replace(/\{(\w+)\}/g, function (match, name) {
      return values && values[name] !== undefined ? String(values[name]) : match;
    });
  }

  function syncScroll() {
    document.documentElement.classList.toggle('aksrt-msg-modal-open', !!root.querySelector('dialog[open]'));
  }

  function open(dialog) {
    if (!dialog.open) dialog.showModal();
    syncScroll();
  }

  root.querySelectorAll('.aksrt-msg-dialog').forEach(function (dialog) {
    var outsideStart = false;
    function outside(event) {
      var rect = dialog.getBoundingClientRect();
      return event.clientX < rect.left || event.clientX > rect.right || event.clientY < rect.top || event.clientY > rect.bottom;
    }
    dialog.querySelectorAll('[data-aksrt-dialog-close]').forEach(function (button) {
      button.addEventListener('click', function () { dialog.close(); });
    });
    dialog.addEventListener('pointerdown', function (event) {
      outsideStart = event.target === dialog && outside(event);
    });
    dialog.addEventListener('click', function (event) {
      if (outsideStart && event.target === dialog && outside(event)) dialog.close();
      outsideStart = false;
    });
    dialog.addEventListener('close', syncScroll);
  });

  var pending = null;
  var confirmButton = confirmDialog.querySelector('[data-aksrt-msg-confirm]');
  function ask(title, message, label, danger, callback) {
    pending = callback;
    confirmDialog.querySelector('[data-aksrt-dialog-title]').textContent = title;
    confirmDialog.querySelector('#aksrt-msg-confirm-text').textContent = message;
    confirmButton.textContent = label;
    confirmButton.classList.toggle('aksrt-messages-admin__danger', danger);
    confirmButton.classList.toggle('button-primary', !danger);
    open(confirmDialog);
    confirmDialog.querySelector('[data-aksrt-dialog-close][autofocus]').focus();
  }
  confirmDialog.addEventListener('cancel', function () { pending = null; });
  confirmDialog.addEventListener('close', function () { pending = null; });
  confirmButton.addEventListener('click', function () {
    var callback = pending;
    pending = null;
    confirmDialog.close();
    if (callback) callback();
  });

  root.querySelectorAll('[data-aksrt-msg-view]').forEach(function (button) {
    button.addEventListener('click', function () {
      var template = document.getElementById('aksrt-msg-detail-' + button.getAttribute('data-aksrt-msg-view'));
      if (!template) return;
      detail.querySelector('[data-aksrt-msg-detail-body]').replaceChildren(template.content.cloneNode(true));
      open(detail);
    });
  });

  var list = root.querySelector('[data-aksrt-msg-list]');
  var listSubmitting = false;
  var syncSelection;
  if (list) {
    var checks = Array.from(list.querySelectorAll('[data-aksrt-msg-check]'));
    var checkAll = list.querySelector('[data-aksrt-msg-check-all]');
    var selection = list.querySelector('[data-aksrt-msg-selection]');
    var bulkButtons = list.querySelectorAll('[data-aksrt-msg-action]:not([data-id])');

    function selected() { return checks.filter(function (check) { return check.checked; }); }
    syncSelection = function () {
      var count = selected().length;
      selection.textContent = selection.getAttribute('data-label').replace('%d', String(count));
      checkAll.checked = count > 0 && count === checks.length;
      checkAll.indeterminate = count > 0 && count < checks.length;
      checkAll.disabled = listSubmitting || checks.length === 0;
      bulkButtons.forEach(function (button) { button.disabled = listSubmitting || count === 0; });
      checks.forEach(function (check) { check.closest('tr').classList.toggle('is-selected', check.checked); });
    };
    checkAll.addEventListener('change', function () {
      checks.forEach(function (check) { check.checked = checkAll.checked; });
      syncSelection();
    });
    checks.forEach(function (check) { check.addEventListener('change', syncSelection); });
    function mutate(op, id) {
      if (listSubmitting) return;
      list.elements.bulk_action.value = op;
      list.elements.message_id.value = id || '';
      list.requestSubmit();
    }
    list.querySelectorAll('[data-aksrt-msg-action]').forEach(function (button) {
      button.addEventListener('click', function () {
        if (listSubmitting) return;
        var op = button.getAttribute('data-aksrt-msg-action');
        var id = button.getAttribute('data-id');
        var count = id ? 1 : selected().length;
        if (!count) return;
        if (op === 'delete') {
          ask(text(confirmDialog, 'delete-title'), text(confirmDialog, 'delete-text', { count: count }), text(confirmDialog, 'delete-send'), true, function () { mutate(op, id); });
        } else {
          mutate(op, id);
        }
      });
    });
    list.addEventListener('submit', function (event) {
      if (listSubmitting || !list.elements.bulk_action.value || (!list.elements.message_id.value && !selected().length)) {
        event.preventDefault();
        return;
      }
      listSubmitting = true;
      // 只锁操作按钮，不禁用复选框，否则 ids[] 不会随表单提交。
      list.querySelectorAll('button').forEach(function (button) { button.disabled = true; });
      syncSelection();
    });
    syncSelection();
  }

  var form = compose.querySelector('[data-aksrt-msg-compose]');
  var send = form.querySelector('[data-aksrt-msg-send]');
  var role = form.elements.role;
  var counters = form.querySelectorAll('[data-count-limit]');
  var sending = false;
  var approved = '';

  function clearApproval() {
    approved = '';
    form.elements.confirmed_role.value = '';
    form.elements.confirmed_count.value = '';
  }
  function syncCounters() {
    counters.forEach(function (field) {
      // 与 PHP mb_strlen 一致按 Unicode 码点计数，emoji 不占两个字。
      var count = Array.from(field.value).length;
      var limit = Number(field.getAttribute('data-count-limit'));
      var counter = form.querySelector('[data-count-for="' + field.name + '"]');
      counter.textContent = count + ' / ' + limit;
      counter.classList.toggle('is-over', count > limit);
      field.setCustomValidity(count > limit ? text(form, 'count-error', { count: limit }) : '');
    });
  }
  function syncRole() {
    var option = role.options[role.selectedIndex];
    var count = option ? Number(option.getAttribute('data-count')) : 0;
    form.querySelector('[data-aksrt-msg-role-hint]').textContent = count > 0 && !option.disabled ? text(form, 'role-hint', { count: count }) : '';
  }
  function mode() { return form.querySelector('input[name="recipient_mode"]:checked').value; }
  function syncMode() {
    clearApproval();
    form.querySelectorAll('[data-aksrt-msg-pane]').forEach(function (pane) {
      var active = pane.getAttribute('data-aksrt-msg-pane') === mode();
      pane.hidden = !active;
      pane.querySelectorAll('input, select, textarea').forEach(function (field) { field.disabled = !active; });
    });
    syncRole();
  }
  form.querySelectorAll('input[name="recipient_mode"]').forEach(function (radio) { radio.addEventListener('change', syncMode); });
  role.addEventListener('change', function () { clearApproval(); syncRole(); });
  form.addEventListener('input', function () { clearApproval(); syncCounters(); });

  function snapshot() {
    return JSON.stringify([role.value, role.options[role.selectedIndex].getAttribute('data-count'), form.elements.title.value, form.elements.content.value, form.elements.target_url.value]);
  }
  form.addEventListener('submit', function (event) {
    syncCounters();
    if (sending || !form.reportValidity()) {
      event.preventDefault();
      return;
    }
    if (mode() === 'role' && approved !== snapshot()) {
      event.preventDefault();
      var option = role.options[role.selectedIndex];
      if (!option || option.disabled || !role.value) return;
      var count = Number(option.getAttribute('data-count'));
      var current = snapshot();
      ask(text(form, 'role-title'), text(form, 'role-confirm', { role: option.getAttribute('data-label'), count: count }), text(form, 'role-send'), false, function () {
        if (mode() !== 'role' || current !== snapshot()) return;
        approved = current;
        form.elements.confirmed_role.value = role.value;
        form.elements.confirmed_count.value = String(count);
        form.requestSubmit(send);
      });
      return;
    }
    sending = true;
    send.disabled = true;
  });

  root.querySelectorAll('[data-aksrt-dialog-open]').forEach(function (button) {
    button.addEventListener('click', function () {
      open(compose);
      var field = mode() === 'role' ? role : form.elements.users;
      field.focus();
    });
  });
  window.addEventListener('pageshow', function () {
    sending = false;
    send.disabled = false;
    clearApproval();
    if (list) {
      listSubmitting = false;
      list.elements.bulk_action.value = '';
      list.elements.message_id.value = '';
      list.querySelectorAll('button[data-id], button[data-aksrt-msg-view]').forEach(function (button) { button.disabled = false; });
      syncSelection();
    }
    syncCounters();
  });
  syncMode();
  syncCounters();
  if (compose.hasAttribute('data-aksrt-dialog-autoopen')) open(compose);
})();