crazycharge-app/util/index.ts

import { Linking, Alert } from 'react-native';
import * as Clipboard from 'expo-clipboard';
export const handleGoWhatsApp = async () => {
  const phoneWithCountryCode = '85291382139'; // 不带 "+"，如 +60 改成 60（马来西亚）
  const message = '';

  const whatsappUrl = `whatsapp://send?phone=${phoneWithCountryCode}&text=${encodeURIComponent(message)}`;
  const webWhatsappUrl = `https://wa.me/${phoneWithCountryCode}`;

  try {
    const supported = await Linking.canOpenURL(whatsappUrl);
    if (supported) {
      await Linking.openURL(whatsappUrl);
    } else {
      // If WhatsApp app URL fails, try the web URL
      await Linking.openURL(webWhatsappUrl);
      Alert.alert('WhatsApp 未安裝', '請先安裝 WhatsApp 應用');
    }
  } catch (error) {
    console.error('Error opening WhatsApp:', error);
    // Fallback to showing the number if both methods fail
    Alert.alert('聯絡我們', `請通過WhatsApp聯繫我們：${phoneWithCountryCode}`, [
      { text: '複製號碼', onPress: async () => await Clipboard.setStringAsync(phoneWithCountryCode) },
      { text: '取消', style: 'cancel' }
    ]);
  }
};