// ============================================================
// ADMIN: DEVELOPMENTAL MILESTONES MANAGEMENT
// ============================================================

(function() {
  var _inited = false;

  document.addEventListener('tabChanged', function(e) {
    if (e.detail.tab !== 'admin' || _inited) return;
    _inited = true;
    initMilestonesAdmin();
  });

  var milestones = [];
  var ageGroups = [];
  var domains = [];
  var editingId = null;

  function initMilestonesAdmin() {
    console.log('[AdminMilestones] Initializing...');

    // Buttons
    document.getElementById('btn-refresh-milestones')?.addEventListener('click', loadMilestones);
    document.getElementById('btn-add-milestone')?.addEventListener('click', function() {
      editingId = null;
      openMilestoneModal();
    });
    document.getElementById('btn-close-milestone-modal')?.addEventListener('click', closeMilestoneModal);
    document.getElementById('btn-cancel-milestone-modal')?.addEventListener('click', closeMilestoneModal);
    document.getElementById('btn-save-milestone')?.addEventListener('click', saveMilestone);
    document.getElementById('btn-bulk-import-milestones')?.addEventListener('click', bulkImportMilestones);
    document.getElementById('btn-reimport-milestones')?.addEventListener('click', function() {
      showConfirm('This will DELETE all existing milestones and re-import from static data. Continue?', function() {
        bulkImportMilestones(true);
      }, { danger: true, confirmText: 'Re-import' });
    });

    // Filter
    document.getElementById('ms-filter-age')?.addEventListener('change', renderMilestones);

    // Load data
    loadMetadata();
    loadMilestones();
  }

  function loadMetadata() {
    fetch('/api/admin/milestones/meta', {
      headers: getAuthHeaders()
    })
    .then(r => r.json())
    .then(data => {
      if (!data.success) return;
      ageGroups = data.age_groups || [];
      domains = data.domains || [];

      // Populate filter dropdown
      var filterSelect = document.getElementById('ms-filter-age');
      if (filterSelect) {
        filterSelect.innerHTML = '<option value="">All Age Groups</option>';
        ageGroups.forEach(function(age) {
          var opt = document.createElement('option');
          opt.value = age;
          opt.textContent = age;
          filterSelect.appendChild(opt);
        });
      }

      // Populate datalists for modal
      var ageDatalist = document.getElementById('ms-age-list');
      if (ageDatalist) {
        ageDatalist.innerHTML = '';
        ageGroups.forEach(function(age) {
          var opt = document.createElement('option');
          opt.value = age;
          ageDatalist.appendChild(opt);
        });
      }

      var domainDatalist = document.getElementById('ms-domain-list');
      if (domainDatalist) {
        domainDatalist.innerHTML = '';
        domains.forEach(function(domain) {
          var opt = document.createElement('option');
          opt.value = domain;
          domainDatalist.appendChild(opt);
        });
      }
    })
    .catch(err => console.error('[AdminMilestones] Failed to load metadata:', err));
  }

  function loadMilestones() {
    var filterAge = document.getElementById('ms-filter-age')?.value;
    var url = '/api/admin/milestones' + (filterAge ? '?age_group=' + encodeURIComponent(filterAge) : '');

    fetch(url, {
      headers: getAuthHeaders()
    })
    .then(r => r.json())
    .then(data => {
      if (!data.success) {
        showToast(data.error || 'Failed to load milestones', 'error');
        return;
      }
      milestones = data.milestones || [];

      // Show/hide empty notice
      var emptyNotice = document.getElementById('ms-empty-notice');
      if (emptyNotice) {
        emptyNotice.style.display = (milestones.length === 0 && !filterAge) ? 'block' : 'none';
      }

      renderMilestones();
    })
    .catch(err => {
      console.error('[AdminMilestones] Failed to load:', err);
      showToast('Failed to load milestones: ' + err.message, 'error');
    });
  }

  function renderMilestones() {
    var list = document.getElementById('milestones-list');
    if (!list) return;

    var filterAge = document.getElementById('ms-filter-age')?.value;
    var filtered = filterAge ? milestones.filter(m => m.age_group === filterAge) : milestones;

    if (filtered.length === 0) {
      list.innerHTML = '<p style="text-align:center;color:var(--g400);padding:40px;">No milestones found. Click "Add Milestone" to create one.</p>';
      return;
    }

    // Group by age_group and domain
    var grouped = {};
    filtered.forEach(function(m) {
      if (!grouped[m.age_group]) grouped[m.age_group] = {};
      if (!grouped[m.age_group][m.domain]) grouped[m.age_group][m.domain] = [];
      grouped[m.age_group][m.domain].push(m);
    });

    var html = '';
    Object.keys(grouped).forEach(function(age) {
      html += '<div style="border:1px solid var(--g200);border-radius:8px;padding:12px;background:var(--g50);">';
      html += '<h4 style="margin:0 0 12px 0;font-size:15px;color:var(--g700);">' + age + '</h4>';

      Object.keys(grouped[age]).forEach(function(domain) {
        html += '<div style="margin-bottom:10px;">';
        html += '<div style="font-size:13px;font-weight:600;color:var(--g600);margin-bottom:6px;">' + domain + '</div>';

        grouped[age][domain].forEach(function(m) {
          html += '<div style="display:flex;align-items:center;gap:8px;padding:6px;border:1px solid var(--g200);border-radius:6px;background:white;margin-bottom:4px;">';
          html += '<span style="flex:1;font-size:13px;color:var(--g700);">' + m.milestone_text + '</span>';
          html += '<button class="btn-sm btn-ghost" style="padding:4px 8px;font-size:11px;" onclick="editMilestone(' + m.id + ')"><i class="fas fa-edit"></i></button>';
          html += '<button class="btn-sm" style="padding:4px 8px;font-size:11px;background:var(--red);color:white;border:none;" onclick="deleteMilestone(' + m.id + ')"><i class="fas fa-trash"></i></button>';
          html += '</div>';
        });

        html += '</div>';
      });

      html += '</div>';
    });

    list.innerHTML = html;
  }

  function openMilestoneModal(milestone) {
    var modal = document.getElementById('milestone-modal');
    var title = document.getElementById('milestone-modal-title');

    if (!modal) return;

    if (milestone) {
      title.innerHTML = '<i class="fas fa-edit"></i> Edit Milestone';
      document.getElementById('ms-edit-id').value = milestone.id;
      document.getElementById('ms-edit-age').value = milestone.age_group;
      document.getElementById('ms-edit-domain').value = milestone.domain;
      document.getElementById('ms-edit-text').value = milestone.milestone_text;
      document.getElementById('ms-edit-sort').value = milestone.sort_order;
    } else {
      title.innerHTML = '<i class="fas fa-plus"></i> Add Milestone';
      document.getElementById('ms-edit-id').value = '';
      document.getElementById('ms-edit-age').value = '';
      document.getElementById('ms-edit-domain').value = '';
      document.getElementById('ms-edit-text').value = '';
      document.getElementById('ms-edit-sort').value = '0';
    }

    modal.style.display = 'flex';
  }

  function closeMilestoneModal() {
    var modal = document.getElementById('milestone-modal');
    if (modal) modal.style.display = 'none';
  }

  function saveMilestone() {
    var id = document.getElementById('ms-edit-id').value;
    var age_group = document.getElementById('ms-edit-age').value.trim();
    var domain = document.getElementById('ms-edit-domain').value.trim();
    var milestone_text = document.getElementById('ms-edit-text').value.trim();
    var sort_order = parseInt(document.getElementById('ms-edit-sort').value) || 0;

    if (!age_group || !domain || !milestone_text) {
      showToast('Please fill in all fields', 'error');
      return;
    }

    var method = id ? 'PUT' : 'POST';
    var url = id ? '/api/admin/milestones/' + id : '/api/admin/milestones';

    fetch(url, {
      method: method,
      headers: getAuthHeaders(),
      body: JSON.stringify({ age_group, domain, milestone_text, sort_order })
    })
    .then(r => r.json())
    .then(data => {
      if (!data.success) {
        showToast(data.error || 'Failed to save', 'error');
        return;
      }
      showToast(id ? 'Milestone updated' : 'Milestone added', 'success');
      closeMilestoneModal();
      loadMetadata();
      loadMilestones();
    })
    .catch(err => {
      console.error('[AdminMilestones] Save error:', err);
      showToast('Failed to save: ' + err.message, 'error');
    });
  }

  window.editMilestone = function(id) {
    var milestone = milestones.find(m => m.id === id);
    if (!milestone) return;
    editingId = id;
    openMilestoneModal(milestone);
  };

  window.deleteMilestone = function(id) {
    showConfirm('Delete this milestone? This action cannot be undone.', function() {
      fetch('/api/admin/milestones/' + id, {
        method: 'DELETE',
        headers: getAuthHeaders()
      })
      .then(r => r.json())
      .then(data => {
        if (!data.success) {
          showToast(data.error || 'Failed to delete', 'error');
          return;
        }
        showToast('Milestone deleted', 'success');
        loadMetadata();
        loadMilestones();
      })
      .catch(err => {
        console.error('[AdminMilestones] Delete error:', err);
        showToast('Failed to delete: ' + err.message, 'error');
      });
    }, { danger: true, confirmText: 'Delete' });
  };

  function bulkImportMilestones(clearExisting) {
    if (!window.MILESTONES_DATA_STATIC) {
      showToast('Static milestones data not available', 'error');
      return;
    }

    var btn = clearExisting ? document.getElementById('btn-reimport-milestones') : document.getElementById('btn-bulk-import-milestones');
    if (btn) {
      btn.disabled = true;
      btn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> Importing...';
    }

    // Convert static data to array format for bulk import
    var milestonesToImport = [];
    var sortOrder = 0;

    Object.keys(window.MILESTONES_DATA_STATIC).forEach(function(ageGroup) {
      Object.keys(window.MILESTONES_DATA_STATIC[ageGroup]).forEach(function(domain) {
        var items = window.MILESTONES_DATA_STATIC[ageGroup][domain];
        items.forEach(function(text) {
          milestonesToImport.push({
            age_group: ageGroup,
            domain: domain,
            milestone_text: text,
            sort_order: sortOrder++
          });
        });
      });
    });

    // Import directly (backend will handle existing data)
    fetch('/api/admin/milestones/bulk-import', {
      method: 'POST',
      headers: getAuthHeaders(),
      body: JSON.stringify({ milestones: milestonesToImport, clearExisting: clearExisting })
    })
      .then(function(r) { return r.json(); })
      .then(function(data) {
        if (btn) {
          btn.disabled = false;
          btn.innerHTML = clearExisting ? '<i class="fas fa-sync"></i> Re-import All' : '<i class="fas fa-download"></i> Import Default Milestones Data';
        }

        if (!data.success) {
          showToast(data.error || 'Import failed', 'error');
          return;
        }

        showToast('Successfully imported ' + data.imported + ' milestones', 'success');
        loadMetadata();
        loadMilestones();
      })
      .catch(function(err) {
        if (btn) {
          btn.disabled = false;
          btn.innerHTML = clearExisting ? '<i class="fas fa-sync"></i> Re-import All' : '<i class="fas fa-download"></i> Import Default Milestones Data';
        }
        console.error('[AdminMilestones] Import error:', err);
        showToast('Import failed: ' + err.message, 'error');
      });
  }

})();