import { deleteJson, getJson, sendJson } from './api.js';
import { renderCmsCategoryList, renderCmsContentEmpty, renderCmsContentRow } from './cmsRenderer.js';
import { esc } from './sanitize.js';

export function createCmsController(deps) {
  var contentData = [];

  function loadStats() {
    getJson('/api/admin/learning/stats')
      .then(function(data) {
        if (!data.success) return;
        var s = data.stats;
        setText('cms-stat-published', s.publishedContent);
        setText('cms-stat-drafts', s.totalContent - s.publishedContent);
        setText('cms-stat-categories', s.totalCategories);
        setText('cms-stat-quizzes', s.totalQuizzes);
        setText('cms-stat-attempts', s.totalAttempts);
      });
  }

  function loadCategories(editorCategoryId, filterCategoryId) {
    getJson('/api/admin/learning/categories')
      .then(function(data) {
        if (!data.success) return;
        var container = document.getElementById('lh-cms-categories');
        if (!container) return;

        container.innerHTML = renderCmsCategoryList(data.categories);
        updateCategorySelects(data.categories, editorCategoryId, filterCategoryId);
        setActiveCategory((document.getElementById('cms-filter-category') || {}).value || 'all');
      });
  }

  function addCategory() {
    var input = document.getElementById('lh-cms-cat-name');
    if (!input || !input.value.trim()) { deps.showToast('Enter category name', 'error'); return; }

    sendJson('/api/admin/learning/categories', 'POST', { name: input.value.trim() })
      .then(function(data) {
        if (data.success) {
          input.value = '';
          loadCategories();
          deps.refreshUserCategories();
          deps.showToast('Category created', 'success');
        } else deps.showToast(data.error || 'Failed', 'error');
      })
      .catch(function() { deps.showToast('Request failed', 'error'); });
  }

  function deleteCategory(id) {
    if (!window.__confirmDeleteCat) {
      window.__confirmDeleteCat = id;
      deps.showToast('Click delete again to confirm removing this category', 'info');
      setTimeout(function() { window.__confirmDeleteCat = null; }, 4000);
      return;
    }
    window.__confirmDeleteCat = null;
    deleteJson('/api/admin/learning/categories/' + id)
      .then(function(data) {
        if (data.success) {
          loadCategories();
          deps.refreshUserCategories();
          deps.showToast('Category deleted', 'info');
        } else deps.showToast(data.error || 'Failed', 'error');
      });
  }

  function loadContent() {
    var container = document.getElementById('lh-cms-content-list');
    if (!container) return;
    container.innerHTML = '<p style="text-align:center;color:var(--g400);padding:12px;">Loading...</p>';

    getJson('/api/admin/learning/content')
      .then(function(data) {
        if (!data.success) return;
        contentData = data.content || [];
        if (contentData.length === 0) {
          container.innerHTML = '<p style="text-align:center;color:var(--g400);padding:12px;">No content yet. Click "New Content" to create.</p>';
          return;
        }
        renderContentList(contentData);
      });
  }

  function handleFilterInput(e) {
    if (e.target.id === 'cms-search') filterContent();
  }

  function handleFilterChange(e) {
    if (e.target.id !== 'cms-filter-status' && e.target.id !== 'cms-filter-category') return;
    if (e.target.id === 'cms-filter-category') setActiveCategory(e.target.value || 'all');
    filterContent();
  }

  function filterByCategory(categoryId) {
    var filterSel = document.getElementById('cms-filter-category');
    if (filterSel) filterSel.value = String(categoryId);
    setActiveCategory(categoryId);
    filterContent();
  }

  function refreshAll() {
    loadContent();
    loadCategories();
    loadStats();
  }

  function renderContentList(items) {
    var container = document.getElementById('lh-cms-content-list');
    if (!container) return;
    if (!items || items.length === 0) {
      container.innerHTML = renderCmsContentEmpty();
      return;
    }

    container.innerHTML = items.map(renderCmsContentRow).join('');
  }

  function filterContent() {
    var search = (document.getElementById('cms-search') || {}).value || '';
    var statusFilter = (document.getElementById('cms-filter-status') || {}).value || 'all';
    var catFilter = (document.getElementById('cms-filter-category') || {}).value || 'all';

    search = search.toLowerCase().trim();
    var filtered = contentData.filter(function(item) {
      var title = (item.title || '').toLowerCase();
      var subject = (item.subject || '').toLowerCase();
      if (search && title.indexOf(search) === -1 && subject.indexOf(search) === -1) return false;
      if (statusFilter === 'published' && !item.published) return false;
      if (statusFilter === 'draft' && item.published) return false;
      if (catFilter !== 'all' && String(item.category_id) !== catFilter) return false;
      return true;
    });
    renderContentList(filtered);
  }

  return {
    addCategory: addCategory,
    deleteCategory: deleteCategory,
    filterByCategory: filterByCategory,
    handleFilterChange: handleFilterChange,
    handleFilterInput: handleFilterInput,
    loadCategories: loadCategories,
    loadContent: loadContent,
    loadStats: loadStats,
    refreshAll: refreshAll
  };
}

function updateCategorySelects(categories, editorCategoryId, filterCategoryId) {
  var sel = document.getElementById('lh-cms-edit-category');
  if (sel) {
    var selectedEditorId = editorCategoryId !== undefined ? editorCategoryId : sel.value;
    sel.innerHTML = '<option value="">Uncategorized</option>';
    categories.forEach(function(c) {
      sel.innerHTML += '<option value="' + c.id + '">' + esc(c.name) + '</option>';
    });
    if (selectedEditorId && hasSelectValue(sel, selectedEditorId)) sel.value = selectedEditorId;
  }

  var filterSel = document.getElementById('cms-filter-category');
  if (filterSel) {
    var selectedFilterId = filterCategoryId !== undefined ? filterCategoryId : filterSel.value;
    filterSel.innerHTML = '<option value="all">All Categories</option>';
    categories.forEach(function(c) {
      filterSel.innerHTML += '<option value="' + c.id + '">' + esc(c.name) + '</option>';
    });
    if (selectedFilterId && hasSelectValue(filterSel, selectedFilterId)) filterSel.value = selectedFilterId;
  }
}

function setText(id, val) {
  var el = document.getElementById(id);
  if (el) el.textContent = val;
}

function setActiveCategory(categoryId) {
  categoryId = String(categoryId || 'all');
  document.querySelectorAll('.lh-cms-cat-filter').forEach(function(item) {
    item.classList.toggle('active', categoryId !== 'all' && item.dataset.id === categoryId);
  });
}

function hasSelectValue(sel, value) {
  value = String(value);
  for (var i = 0; i < sel.options.length; i++) {
    if (sel.options[i].value === value) return true;
  }
  return false;
}