document.addEventListener('DOMContentLoaded', () => {
  // Configurações
  const API_URL = '/api/admin/clinics';
  
  // Pegar Token JWT do Admin
  const token = localStorage.getItem('token') || '';

  // Se não tem token, redirecionar imediatamente para login
  if (!token) {
    window.location.href = '/login';
    return;
  }

  const fetchOptions = {
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Bearer ${token}`
    }
  };

  // Elementos UI
  const clinicsTableBody = document.getElementById('clinicsTableBody');
  const addClinicBtn = document.getElementById('addClinicBtn');
  const clinicModal = document.getElementById('clinicModal');
  const tokenModal = document.getElementById('tokenModal');
  const closeModals = document.querySelectorAll('.close-modal');
  const closeTokenModal = document.querySelector('.close-token-modal');
  const clinicForm = document.getElementById('clinicForm');
  const generatedTokenElem = document.getElementById('generatedToken');
  const copyTokenBtn = document.getElementById('copyTokenBtn');
  
  // Stats
  const totalDevicesElem = document.getElementById('totalDevices');
  const activeDevicesElem = document.getElementById('activeDevices');
  const blockedDevicesElem = document.getElementById('blockedDevices');

  // Inicializar
  loadClinics();

  // ==========================================
  // Carregar Clínicas
  // ==========================================
  async function loadClinics() {
    try {
      const response = await fetch(API_URL, fetchOptions);

      // Se recebeu 401 ou 403, token expirou — vai para login
      if (response.status === 401 || response.status === 403) {
        localStorage.removeItem('token');
        window.location.href = '/login';
        return;
      }

      // Verificar se a resposta é realmente JSON (evita erro com HTML)
      const contentType = response.headers.get('content-type') || '';
      if (!contentType.includes('application/json')) {
        throw new Error('Sessão expirada ou servidor indisponível. Faça login novamente.');
      }

      if (!response.ok) {
        throw new Error(`Erro HTTP ${response.status}`);
      }
      
      const data = await response.json();
      if (data.success) {
        renderClinics(data.clinics);
        updateStats(data.clinics);
      } else {
        showToast(data.message, 'error');
      }
    } catch (error) {
      console.error(error);
      clinicsTableBody.innerHTML = `<tr><td colspan="7" style="text-align:center;color:red;">${error.message || 'Erro ao carregar dados.'}</td></tr>`;
    }
  }

  // ==========================================
  // Renderizar Tabela
  // ==========================================
  function renderClinics(clinics) {
    if (clinics.length === 0) {
      clinicsTableBody.innerHTML = `<tr><td colspan="7" style="text-align:center;padding:30px;color:#a0aec0;">Nenhum dispositivo cadastrado.</td></tr>`;
      return;
    }

    clinicsTableBody.innerHTML = '';
    clinics.forEach(c => {
      const isAct = c.is_active;
      const statusClass = isAct ? 'status-active' : 'status-inactive';
      const statusIcon = isAct ? 'fa-check' : 'fa-ban';
      const statusText = isAct ? 'Ativo' : 'Bloqueado';
      
      const tr = document.createElement('tr');
      tr.innerHTML = `
        <td><span class="status-badge ${statusClass}"><i class="fa-solid ${statusIcon}"></i> ${statusText}</span></td>
        <td><strong>${c.clinic_name}</strong></td>
        <td><i class="fa-solid fa-desktop" style="color:#a0aec0;margin-right:6px"></i>${c.pc_name || '-'}</td>
        <td>${c.email}</td>
        <td>${c.last_ip || 'Nunca conectou'}</td>
        <td><span class="token-blur" title="Clique para copiar" onclick="navigator.clipboard.writeText('${c.machine_token}');showToast('Token copiado!')">${c.machine_token.split('-')[0]}...</span></td>
        <td>
          <div style="display:flex;gap:12px;align-items:center;">
            <label class="toggle-switch" title="${isAct ? 'Bloquear Acesso' : 'Ativar Acesso'}">
              <input type="checkbox" ${isAct ? 'checked' : ''} onchange="toggleStatus(${c.id}, this.checked)">
              <span class="slider"></span>
            </label>
            <button class="icon-btn delete" onclick="deleteClinic(${c.id})" title="Excluir">
              <i class="fa-solid fa-trash"></i>
            </button>
          </div>
        </td>
      `;
      clinicsTableBody.appendChild(tr);
    });
  }

  function updateStats(clinics) {
    const total = clinics.length;
    const active = clinics.filter(c => c.is_active).length;
    const blocked = total - active;

    totalDevicesElem.textContent = total;
    activeDevicesElem.textContent = active;
    blockedDevicesElem.textContent = blocked;
  }

  // ==========================================
  // Cadastrar Clínica
  // ==========================================
  clinicForm.addEventListener('submit', async (e) => {
    e.preventDefault();
    const submitBtn = document.getElementById('submitBtn');
    submitBtn.disabled = true;
    submitBtn.innerHTML = '<i class="fa-solid fa-spinner fa-spin"></i> Salvando...';

    const formData = new FormData(clinicForm);
    const bodyData = Object.fromEntries(formData.entries());

    try {
      const response = await fetch(API_URL, {
        method: 'POST',
        headers: fetchOptions.headers,
        body: JSON.stringify(bodyData)
      });
      
      const data = await response.json();
      
      if (data.success) {
        clinicModal.classList.remove('active');
        clinicForm.reset();
        loadClinics();
        
        // Show Token Modal
        generatedTokenElem.textContent = data.machine_token;
        tokenModal.classList.add('active');
      } else {
        showToast(data.message, 'error');
      }
    } catch (error) {
      showToast('Erro de conexão ao salvar', 'error');
    } finally {
      submitBtn.disabled = false;
      submitBtn.innerHTML = '<i class="fa-solid fa-check"></i> Salvar e Gerar Token';
    }
  });

  // ==========================================
  // Toggle Status
  // ==========================================
  window.toggleStatus = async (id, isActive) => {
    try {
      const response = await fetch(`${API_URL}/${id}/status`, {
        method: 'PUT',
        headers: fetchOptions.headers,
        body: JSON.stringify({ is_active: isActive })
      });
      const data = await response.json();
      if(data.success) {
        showToast(isActive ? 'Dispositivo Ativado' : 'Dispositivo Bloqueado', 'success');
        loadClinics();
      } else {
        showToast(data.message, 'error');
        loadClinics(); // revert UI
      }
    } catch (error) {
      showToast('Erro ao alterar status', 'error');
      loadClinics();
    }
  };

  // ==========================================
  // Deletar
  // ==========================================
  window.deleteClinic = async (id) => {
    if(!confirm('Tem certeza que deseja excluir este dispositivo permanentemente? O Desktop perderá acesso instantaneamente.')) return;
    
    try {
      const response = await fetch(`${API_URL}/${id}`, {
        method: 'DELETE',
        headers: fetchOptions.headers
      });
      const data = await response.json();
      if(data.success) {
        showToast('Dispositivo removido', 'success');
        loadClinics();
      } else {
        showToast(data.message, 'error');
      }
    } catch (error) {
      showToast('Erro ao excluir', 'error');
    }
  };

  // ==========================================
  // UI Actions (Modals, Copy, Logout)
  // ==========================================
  addClinicBtn.addEventListener('click', () => clinicModal.classList.add('active'));
  
  closeModals.forEach(btn => btn.addEventListener('click', () => {
    clinicModal.classList.remove('active');
  }));

  closeTokenModal.addEventListener('click', () => {
    tokenModal.classList.remove('active');
  });

  copyTokenBtn.addEventListener('click', () => {
    navigator.clipboard.writeText(generatedTokenElem.textContent).then(() => {
      showToast('Token copiado com sucesso!', 'success');
      copyTokenBtn.innerHTML = '<i class="fa-solid fa-check" style="color:var(--success)"></i>';
      setTimeout(() => {
        copyTokenBtn.innerHTML = '<i class="fa-regular fa-copy"></i>';
      }, 2000);
    });
  });

  document.getElementById('logoutBtn').addEventListener('click', () => {
    localStorage.removeItem('token');
    window.location.href = '/login';
  });

  function showToast(message, type = 'success') {
    const toast = document.getElementById('toast');
    toast.textContent = message;
    toast.className = `toast show ${type}`;
    
    setTimeout(() => {
      toast.className = 'toast';
    }, 3000);
  }
});