// ============================================================
// 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);

    // 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 || [];
      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) {
    if (!confirm('Delete this milestone? This action cannot be undone.')) return;

    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');
    });
  };

})();