feat: Implement WhatsApp QR code flow

- Store instanceId and instanceName after instance creation.
- Add "Ver QR Code" button to fetch and display QR code from API.
- Implement QR code refresh functionality.
- Display success/error messages.

src/pages/WhatsApp.tsx

@@ -6,7 +6,8 @@ import { Input } from '@/components/ui/input';
 import { Button } from '@/components/ui/button';
 import { useToast } from '@/hooks/use-toast';
 import { Label } from '@/components/ui/label';
-import { MessageCircle } from 'lucide-react';
+import { MessageCircle, QrCode, RefreshCw } from 'lucide-react';
+import { Alert, AlertDescription } from '@/components/ui/alert';
 
 interface WhatsAppInstance {
   instanceName: string;
@@ -18,13 +19,28 @@ interface WhatsAppInstance {
 const WhatsApp = () => {
   const { toast } = useToast();
   const [loading, setLoading] = useState(false);
+  const [loadingQR, setLoadingQR] = useState(false);
   const [instanceName, setInstanceName] = useState(() => {
     // Get user's name from localStorage as default value
     const userName = localStorage.getItem('userName') || '';
     return userName;
   });
   const [phoneNumber, setPhoneNumber] = useState('');
-  const [instance, setInstance] = useState<WhatsAppInstance | null>(null);
+  const [instance, setInstance] = useState<WhatsAppInstance | null>(() => {
+    // Check if we have a stored instance
+    const storedInstanceId = localStorage.getItem('whatsappInstanceId');
+    const storedInstanceName = localStorage.getItem('whatsappInstanceName');
+    
+    if (storedInstanceId && storedInstanceName) {
+      return {
+        instanceName: storedInstanceName,
+        instanceId: storedInstanceId
+      };
+    }
+    return null;
+  });
+  const [qrCodeData, setQrCodeData] = useState<string | null>(null);
+  const [qrError, setQrError] = useState<string | null>(null);
 
   const createInstance = async () => {
     // Validate form fields
@@ -74,20 +90,28 @@ const WhatsApp = () => {
       }
 
       // Handle successful response
-      setInstance({
+      const newInstance = {
         instanceName,
         instanceId: data.instanceId,
         status: data.status,
         qrcode: data.qrcode
-      });
+      };
+      
+      setInstance(newInstance);
 
-      // Save the instance ID for later use
+      // Save the instance details for later use
       localStorage.setItem('whatsappInstanceId', data.instanceId);
+      localStorage.setItem('whatsappInstanceName', instanceName);
       
       toast({
         title: "Sucesso!",
         description: "Instância do WhatsApp criada com sucesso!"
       });
+      
+      // If there's a QR code in the response, set it
+      if (data.qrcode) {
+        setQrCodeData(data.qrcode);
+      }
     } catch (error) {
       console.error("Error creating WhatsApp instance:", error);
       toast({
@@ -95,11 +119,61 @@ const WhatsApp = () => {
         description: "Ocorreu um erro ao conectar com a API. Tente novamente mais tarde.",
         variant: "destructive",
       });
+      setQrError("Falha ao obter QR Code. Tente novamente.");
     } finally {
       setLoading(false);
     }
   };
 
+  const fetchQrCode = async () => {
+    if (!instance?.instanceId) {
+      toast({
+        title: "Erro",
+        description: "Nenhuma instância disponível. Crie uma instância primeiro.",
+        variant: "destructive",
+      });
+      return;
+    }
+
+    setLoadingQR(true);
+    setQrError(null);
+
+    try {
+      const serverUrl = "evolutionapi2.innova1001.com.br";
+      const apiKey = "beeb77fbd7f48f91db2cd539a573c130";
+
+      const response = await fetch(`https://${serverUrl}/instance/qrcode/${instance.instanceId}`, {
+        method: 'GET',
+        headers: {
+          'Content-Type': 'application/json',
+          'apikey': apiKey
+        }
+      });
+
+      const data = await response.json();
+
+      if (!response.ok) {
+        throw new Error(data.message || 'Erro ao obter QR Code');
+      }
+
+      if (data && data.qrcode) {
+        setQrCodeData(data.qrcode);
+      } else {
+        setQrError("QR Code não disponível. A instância pode já estar conectada.");
+      }
+    } catch (error) {
+      console.error("Error fetching QR code:", error);
+      setQrError("Falha ao obter QR Code. Tente novamente.");
+      toast({
+        title: "Erro ao obter QR Code",
+        description: "Não foi possível obter o QR Code. Tente novamente mais tarde.",
+        variant: "destructive",
+      });
+    } finally {
+      setLoadingQR(false);
+    }
+  };
+
   return (
     <Layout>
       <div className="space-y-6">
@@ -107,57 +181,125 @@ const WhatsApp = () => {
           <h1 className="text-2xl font-bold tracking-tight">Conectar WhatsApp</h1>
         </div>
         
-        <Card className="max-w-md mx-auto">
-          <CardHeader>
-            <div className="flex items-center mb-2">
-              <MessageCircle className="h-6 w-6 mr-2 text-green-600" />
-              <CardTitle>Vincular WhatsApp ao App</CardTitle>
-            </div>
-            <CardDescription>
-              Preencha os campos abaixo para conectar sua conta WhatsApp
-            </CardDescription>
-          </CardHeader>
-          <CardContent className="space-y-4">
-            <div className="space-y-2">
-              <Label htmlFor="instanceName">Nome da Instância</Label>
-              <Input
-                id="instanceName"
-                value={instanceName}
-                onChange={(e) => setInstanceName(e.target.value)}
-                placeholder="Digite um nome para a instância"
-                required
-              />
-              <p className="text-xs text-muted-foreground">O nome será usado para identificar esta conexão</p>
-            </div>
-            
-            <div className="space-y-2">
-              <Label htmlFor="phoneNumber">Número do WhatsApp</Label>
-              <Input
-                id="phoneNumber"
-                value={phoneNumber}
-                onChange={(e) => setPhoneNumber(e.target.value)}
-                placeholder="559999999999"
-                required
-              />
-              <p className="text-xs text-muted-foreground">Digite o número com DDD e código do país</p>
-            </div>
-            
-            <Button 
-              className="w-full mt-4" 
-              onClick={createInstance}
-              disabled={loading}
-            >
-              {loading ? "Criando..." : "Criar Instância"}
-            </Button>
-            
-            {instance && instance.instanceId && (
-              <div className="p-3 bg-green-50 text-green-800 rounded-md mt-4 text-sm">
+        {!instance?.instanceId ? (
+          <Card className="max-w-md mx-auto">
+            <CardHeader>
+              <div className="flex items-center mb-2">
+                <MessageCircle className="h-6 w-6 mr-2 text-green-600" />
+                <CardTitle>Vincular WhatsApp ao App</CardTitle>
+              </div>
+              <CardDescription>
+                Preencha os campos abaixo para conectar sua conta WhatsApp
+              </CardDescription>
+            </CardHeader>
+            <CardContent className="space-y-4">
+              <div className="space-y-2">
+                <Label htmlFor="instanceName">Nome da Instância</Label>
+                <Input
+                  id="instanceName"
+                  value={instanceName}
+                  onChange={(e) => setInstanceName(e.target.value)}
+                  placeholder="Digite um nome para a instância"
+                  required
+                />
+                <p className="text-xs text-muted-foreground">O nome será usado para identificar esta conexão</p>
+              </div>
+              
+              <div className="space-y-2">
+                <Label htmlFor="phoneNumber">Número do WhatsApp</Label>
+                <Input
+                  id="phoneNumber"
+                  value={phoneNumber}
+                  onChange={(e) => setPhoneNumber(e.target.value)}
+                  placeholder="559999999999"
+                  required
+                />
+                <p className="text-xs text-muted-foreground">Digite o número com DDD e código do país</p>
+              </div>
+              
+              <Button 
+                className="w-full mt-4" 
+                onClick={createInstance}
+                disabled={loading}
+              >
+                {loading ? "Criando..." : "Criar Instância"}
+              </Button>
+            </CardContent>
+          </Card>
+        ) : (
+          <Card className="max-w-md mx-auto">
+            <CardHeader>
+              <div className="flex items-center mb-2">
+                <QrCode className="h-6 w-6 mr-2 text-green-600" />
+                <CardTitle>WhatsApp - {instance.instanceName}</CardTitle>
+              </div>
+              <CardDescription>
+                Escaneie o QR Code com seu WhatsApp para finalizar a conexão
+              </CardDescription>
+            </CardHeader>
+            <CardContent className="space-y-4">
+              <div className="p-3 bg-green-50 text-green-800 rounded-md text-sm">
                 <p><strong>Instância criada com sucesso!</strong></p>
                 <p className="text-xs mt-1">ID da instância: {instance.instanceId}</p>
               </div>
-            )}
-          </CardContent>
-        </Card>
+              
+              {!qrCodeData && !qrError && !loadingQR && (
+                <Button 
+                  className="w-full" 
+                  onClick={fetchQrCode}
+                  disabled={loadingQR}
+                >
+                  Ver QR Code
+                </Button>
+              )}
+              
+              {loadingQR && (
+                <div className="text-center py-8">
+                  <p>Carregando QR Code...</p>
+                </div>
+              )}
+              
+              {qrCodeData && (
+                <div className="flex flex-col items-center space-y-4">
+                  <div className="border p-4 bg-white rounded-md">
+                    <img 
+                      src={qrCodeData}
+                      alt="QR Code WhatsApp" 
+                      className="w-full h-auto max-w-[250px]" 
+                    />
+                  </div>
+                  <p className="text-sm text-center">
+                    Escaneie este QR Code com seu WhatsApp para finalizar a conexão.
+                  </p>
+                  <Button
+                    variant="outline"
+                    onClick={fetchQrCode}
+                    disabled={loadingQR}
+                    className="flex items-center"
+                  >
+                    <RefreshCw className="w-4 h-4 mr-2" />
+                    Atualizar QR Code
+                  </Button>
+                </div>
+              )}
+              
+              {qrError && (
+                <div className="space-y-4">
+                  <Alert variant="destructive">
+                    <AlertDescription>{qrError}</AlertDescription>
+                  </Alert>
+                  <Button 
+                    onClick={fetchQrCode}
+                    disabled={loadingQR}
+                    className="w-full"
+                  >
+                    Tentar Novamente
+                  </Button>
+                </div>
+              )}
+            </CardContent>
+          </Card>
+        )}
       </div>
     </Layout>
   );