WellNuo/app/(tabs)/voice.tsx

import React, { useState, useCallback, useRef, useEffect } from 'react';
import {
  View,
  Text,
  StyleSheet,
  FlatList,
  TextInput,
  TouchableOpacity,
  KeyboardAvoidingView,
  Platform,
  Alert,
  ActivityIndicator,
  Modal,
  ScrollView,
  Animated,
} from 'react-native';
import { Ionicons } from '@expo/vector-icons';
import { SafeAreaView } from 'react-native-safe-area-context';
import * as SecureStore from 'expo-secure-store';
import * as Speech from 'expo-speech';
import { useBeneficiary } from '@/contexts/BeneficiaryContext';
import { api } from '@/services/api';
import SherpaTTS from '@/services/sherpaTTS';
import {
  AppColors,
  BorderRadius,
  FontSizes,
  Spacing,
  FontWeights,
  Shadows,
} from '@/constants/theme';
import type { Message, Beneficiary } from '@/types';

// Try to import speech recognition if available (not available in Expo Go)
let ExpoSpeechRecognitionModule: any = null;
let SPEECH_RECOGNITION_AVAILABLE = false;
try {
  const speechRecognition = require('expo-speech-recognition');
  ExpoSpeechRecognitionModule = speechRecognition.ExpoSpeechRecognitionModule;
  SPEECH_RECOGNITION_AVAILABLE = true;
} catch (e) {
  console.log('[Voice] expo-speech-recognition not available in Expo Go');
}

const OLD_API_URL = 'https://eluxnetworks.net/function/well-api/api';

// DEV ONLY: Voice options for testing different TTS voices
const DEV_MODE = __DEV__;

interface VoiceOption {
  id: string;
  name: string;
  language: string;
  voice?: string; // iOS voice identifier
}

// Available iOS voices for testing
const AVAILABLE_VOICES: VoiceOption[] = [
  // English voices
  { id: 'en-US-default', name: 'English (US) - Default', language: 'en-US' },
  { id: 'en-US-samantha', name: 'Samantha (US)', language: 'en-US', voice: 'com.apple.ttsbundle.Samantha-compact' },
  { id: 'en-GB-daniel', name: 'Daniel (UK)', language: 'en-GB', voice: 'com.apple.ttsbundle.Daniel-compact' },
  { id: 'en-AU-karen', name: 'Karen (Australia)', language: 'en-AU', voice: 'com.apple.ttsbundle.Karen-compact' },
  { id: 'en-IE-moira', name: 'Moira (Ireland)', language: 'en-IE', voice: 'com.apple.ttsbundle.Moira-compact' },
  { id: 'en-ZA-tessa', name: 'Tessa (South Africa)', language: 'en-ZA', voice: 'com.apple.ttsbundle.Tessa-compact' },
  { id: 'en-IN-rishi', name: 'Rishi (India)', language: 'en-IN', voice: 'com.apple.ttsbundle.Rishi-compact' },
  // European languages
  { id: 'fr-FR', name: 'French (France)', language: 'fr-FR' },
  { id: 'de-DE', name: 'German', language: 'de-DE' },
  { id: 'es-ES', name: 'Spanish (Spain)', language: 'es-ES' },
  { id: 'es-MX', name: 'Spanish (Mexico)', language: 'es-MX' },
  { id: 'it-IT', name: 'Italian', language: 'it-IT' },
  { id: 'pt-BR', name: 'Portuguese (Brazil)', language: 'pt-BR' },
  { id: 'ru-RU', name: 'Russian', language: 'ru-RU' },
  // Asian languages
  { id: 'zh-CN', name: 'Chinese (Mandarin)', language: 'zh-CN' },
  { id: 'ja-JP', name: 'Japanese', language: 'ja-JP' },
  { id: 'ko-KR', name: 'Korean', language: 'ko-KR' },
];

interface ActivityData {
  name: string;
  rooms: Array<{
    name: string;
    data: Array<{
      title: string;
      events: number;
      hours: number;
    }>;
  }>;
}

interface ActivitiesResponse {
  alert_text: string;
  chart_data: ActivityData[];
}

interface VoiceAskResponse {
  ok: boolean;
  response: {
    Command: string;
    body: string;
    name?: string;
    reflected?: string;
    language?: string;
    time?: number;
  };
  status: string;
}

export default function VoiceAIScreen() {
  const { currentBeneficiary, setCurrentBeneficiary } = useBeneficiary();
  const [messages, setMessages] = useState<Message[]>([
    {
      id: '1',
      role: 'assistant',
      content: 'Hello! I\'m Julia, your voice assistant for monitoring your loved ones. Select a beneficiary and tap the microphone to ask a question.',
      timestamp: new Date(),
    },
  ]);
  const [input, setInput] = useState('');
  const [isSending, setIsSending] = useState(false);
  const [isSpeaking, setIsSpeaking] = useState(false);
  const [isListening, setIsListening] = useState(false);
  const [recognizedText, setRecognizedText] = useState('');
  const [showBeneficiaryPicker, setShowBeneficiaryPicker] = useState(false);
  const [isContinuousMode, setIsContinuousMode] = useState(false);
  const [beneficiaries, setBeneficiaries] = useState<Beneficiary[]>([]);
  const [selectedVoice, setSelectedVoice] = useState<VoiceOption>(AVAILABLE_VOICES[0]);
  const [showVoicePicker, setShowVoicePicker] = useState(false);
  const [sherpaTTSReady, setSherpaTTSReady] = useState(false);
  const [useNeuralTTS, setUseNeuralTTS] = useState(true);
  const flatListRef = useRef<FlatList>(null);
  const lastSendTimeRef = useRef<number>(0);
  const pulseAnim = useRef(new Animated.Value(1)).current;
  const fadeAnim = useRef(new Animated.Value(0)).current;
  const SEND_COOLDOWN_MS = 1000;

  // Speech recognition event handlers
  useEffect(() => {
    if (!SPEECH_RECOGNITION_AVAILABLE || !ExpoSpeechRecognitionModule) {
      return;
    }

    const subscriptions: any[] = [];

    try {
      if (ExpoSpeechRecognitionModule.addListener) {
        subscriptions.push(
          ExpoSpeechRecognitionModule.addListener('start', () => {
            setIsListening(true);
            setRecognizedText('');
          })
        );

        subscriptions.push(
          ExpoSpeechRecognitionModule.addListener('end', () => {
            setIsListening(false);
          })
        );

        subscriptions.push(
          ExpoSpeechRecognitionModule.addListener('result', (event: any) => {
            const transcript = event.results?.[0]?.transcript || '';
            setRecognizedText(transcript);

            if (event.isFinal && transcript.trim()) {
              setInput(transcript);
              setTimeout(() => {
                handleSendWithText(transcript);
              }, 300);
            }
          })
        );

        subscriptions.push(
          ExpoSpeechRecognitionModule.addListener('error', (event: any) => {
            setIsListening(false);
            if (event.error !== 'no-speech') {
              Alert.alert('Voice Error', event.message || 'Could not recognize speech.');
            }
          })
        );
      }
    } catch (e) {
      console.log('[Voice] Could not set up speech recognition listeners:', e);
    }

    return () => {
      subscriptions.forEach((sub) => sub?.remove?.());
    };
  }, []);

  // Load beneficiaries and initialize TTS
  useEffect(() => {
    loadBeneficiaries();

    const initTTS = async () => {
      try {
        const success = await SherpaTTS.initialize();
        setSherpaTTSReady(success);
        if (!success) {
          setUseNeuralTTS(false);
        }
      } catch (error) {
        setUseNeuralTTS(false);
      }
    };
    initTTS();

    return () => {
      Speech.stop();
      SherpaTTS.stop();
      SherpaTTS.deinitialize();
    };
  }, []);

  // Modal animation
  useEffect(() => {
    Animated.timing(fadeAnim, {
      toValue: showBeneficiaryPicker || showVoicePicker ? 1 : 0,
      duration: 250,
      useNativeDriver: true,
    }).start();
  }, [showBeneficiaryPicker, showVoicePicker]);

  const loadBeneficiaries = async () => {
    const response = await api.getAllBeneficiaries();
    if (response.ok && response.data) {
      setBeneficiaries(response.data);
    }
  };

  // Pulse animation for speaking
  useEffect(() => {
    if (isSpeaking) {
      const pulse = Animated.loop(
        Animated.sequence([
          Animated.timing(pulseAnim, {
            toValue: 1.3,
            duration: 500,
            useNativeDriver: true,
          }),
          Animated.timing(pulseAnim, {
            toValue: 1,
            duration: 500,
            useNativeDriver: true,
          }),
        ])
      );
      pulse.start();
      return () => pulse.stop();
    }
  }, [isSpeaking]);

  // Fetch activity data
  const getActivityContext = async (token: string, userName: string, deploymentId: string): Promise<string> => {
    try {
      const response = await fetch(OLD_API_URL, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: new URLSearchParams({
          function: 'activities_report_details',
          user_name: userName,
          token: token,
          deployment_id: deploymentId,
          filter: '0',
        }).toString(),
      });

      const data: ActivitiesResponse = await response.json();

      if (!data.chart_data || data.chart_data.length === 0) {
        return '';
      }

      const weeklyData = data.chart_data.find(d => d.name === 'Weekly');
      if (!weeklyData) return '';

      const lines: string[] = [];
      lines.push(`Alert status: ${data.alert_text || 'No alert'}`);

      const todayStats: string[] = [];
      for (const room of weeklyData.rooms) {
        const todayData = room.data[room.data.length - 1];
        if (todayData && todayData.hours > 0) {
          todayStats.push(`${room.name}: ${todayData.hours.toFixed(1)} hours (${todayData.events} events)`);
        }
      }

      if (todayStats.length > 0) {
        lines.push(`Today's activity: ${todayStats.join(', ')}`);
      }

      return lines.join('. ');
    } catch (error) {
      return '';
    }
  };

  const getDashboardContext = async (token: string, userName: string, deploymentId: string): Promise<string> => {
    try {
      const today = new Date().toISOString().split('T')[0];
      const response = await fetch(OLD_API_URL, {
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        body: new URLSearchParams({
          function: 'dashboard_single',
          user_name: userName,
          token: token,
          deployment_id: deploymentId,
          date: today,
        }).toString(),
      });

      const data = await response.json();
      if (!data.result_list || data.result_list.length === 0) return '';

      const info = data.result_list[0];
      const lines: string[] = [];

      if (info.wellness_descriptor) lines.push(`Current wellness: ${info.wellness_descriptor}`);
      if (info.wellness_score_percent) lines.push(`Wellness score: ${info.wellness_score_percent}%`);
      if (info.last_location) lines.push(`Last seen in: ${info.last_location}`);

      return lines.join('. ');
    } catch (error) {
      return '';
    }
  };

  const sendToVoiceAsk = async (question: string): Promise<string> => {
    const token = await SecureStore.getItemAsync('accessToken');
    const userName = await SecureStore.getItemAsync('userName');

    if (!token || !userName) throw new Error('Please log in to use voice assistant');
    if (!currentBeneficiary?.id) throw new Error('Please select a beneficiary first');

    const beneficiaryName = currentBeneficiary.name || 'the patient';
    const deploymentId = currentBeneficiary.id.toString();

    let activityContext = await getActivityContext(token, userName, deploymentId);
    if (!activityContext) {
      activityContext = await getDashboardContext(token, userName, deploymentId);
    }

    let enhancedQuestion: string;
    if (activityContext) {
      enhancedQuestion = `You are a caring assistant helping monitor ${beneficiaryName}'s wellbeing.\n\nHere is the current data about ${beneficiaryName}:\n${activityContext}\n\nBased on this data, please answer: ${question}`;
    } else {
      enhancedQuestion = `You are a caring assistant helping monitor ${beneficiaryName}'s wellbeing. Please answer: ${question}`;
    }

    const response = await fetch(OLD_API_URL, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: new URLSearchParams({
        function: 'voice_ask',
        clientId: '001',
        user_name: userName,
        token: token,
        question: enhancedQuestion,
        deployment_id: deploymentId,
        context: activityContext || '',
      }).toString(),
    });

    const data: VoiceAskResponse = await response.json();

    if (data.ok && data.response?.body) {
      return data.response.body;
    } else if (data.status === '401 Unauthorized') {
      throw new Error('Session expired. Please log in again.');
    } else {
      throw new Error('Could not get response from voice assistant');
    }
  };

  const speakResponse = async (text: string, autoListenAfter: boolean = false) => {
    setIsSpeaking(true);

    const onSpeechComplete = () => {
      setIsSpeaking(false);
      if (autoListenAfter && isContinuousMode && currentBeneficiary?.id) {
        setTimeout(() => startListeningInternal(), 500);
      }
    };

    try {
      if (useNeuralTTS && sherpaTTSReady && selectedVoice.language.startsWith('en')) {
        await SherpaTTS.speak(text, {
          speed: 1.0,
          onDone: onSpeechComplete,
          onError: () => speakWithSystemTTS(text, onSpeechComplete),
        });
      } else {
        speakWithSystemTTS(text, onSpeechComplete);
      }
    } catch (error) {
      setIsSpeaking(false);
    }
  };

  const speakWithSystemTTS = (text: string, onDone: () => void) => {
    const speechOptions: Speech.SpeechOptions = {
      language: selectedVoice.language,
      pitch: 1.0,
      rate: 0.9,
      onDone,
      onError: () => setIsSpeaking(false),
    };
    if (selectedVoice.voice) speechOptions.voice = selectedVoice.voice;
    Speech.speak(text, speechOptions);
  };

  const testVoice = (voice: VoiceOption) => {
    Speech.stop();
    Speech.speak('Hello! I am Julia, your voice assistant.', {
      language: voice.language,
      voice: voice.voice,
    });
  };

  const handleSend = useCallback(async () => {
    const trimmedInput = input.trim();
    if (!trimmedInput || isSending) return;

    if (!currentBeneficiary?.id) {
      Alert.alert('Select Beneficiary', 'Please select a beneficiary first.',
        [{ text: 'Select', onPress: () => setShowBeneficiaryPicker(true) }, { text: 'Cancel' }]
      );
      return;
    }

    const now = Date.now();
    if (now - lastSendTimeRef.current < SEND_COOLDOWN_MS) return;
    lastSendTimeRef.current = now;

    const userMessage: Message = {
      id: Date.now().toString(),
      role: 'user',
      content: trimmedInput,
      timestamp: new Date(),
    };

    setMessages(prev => [...prev, userMessage]);
    setInput('');
    setIsSending(true);

    try {
      const aiResponse = await sendToVoiceAsk(trimmedInput);
      const assistantMessage: Message = {
        id: (Date.now() + 1).toString(),
        role: 'assistant',
        content: aiResponse,
        timestamp: new Date(),
      };
      setMessages(prev => [...prev, assistantMessage]);
      await speakResponse(aiResponse);
    } catch (error) {
      const errorMessage: Message = {
        id: (Date.now() + 1).toString(),
        role: 'assistant',
        content: `Sorry, I encountered an error: ${error instanceof Error ? error.message : 'Unknown error'}`,
        timestamp: new Date(),
      };
      setMessages(prev => [...prev, errorMessage]);
    } finally {
      setIsSending(false);
    }
  }, [input, isSending, currentBeneficiary]);

  const selectBeneficiary = (beneficiary: Beneficiary) => {
    setCurrentBeneficiary(beneficiary);
    setShowBeneficiaryPicker(false);

    const welcomeMessage: Message = {
      id: Date.now().toString(),
      role: 'assistant',
      content: `Ready to answer questions about ${beneficiary.name}. ${beneficiary.wellness_descriptor ? `Status: ${beneficiary.wellness_descriptor}.` : ''} Ask me anything!`,
      timestamp: new Date(),
    };
    setMessages(prev => [...prev, welcomeMessage]);
    speakResponse(`Ready to answer questions about ${beneficiary.name}`);
  };

  const stopSpeaking = async () => {
    Speech.stop();
    SherpaTTS.stop();
    setIsSpeaking(false);
    setIsContinuousMode(false);
  };

  const startListeningInternal = () => {
    if (!SPEECH_RECOGNITION_AVAILABLE || !ExpoSpeechRecognitionModule) return;
    if (isSending || isSpeaking) return;
    if (!currentBeneficiary?.id) return;

    Speech.stop();
    setIsSpeaking(false);

    ExpoSpeechRecognitionModule.start({
      lang: 'en-US',
      interimResults: true,
      maxAlternatives: 1,
      continuous: false,
    });
  };

  const startListening = async () => {
    if (!SPEECH_RECOGNITION_AVAILABLE || !ExpoSpeechRecognitionModule) {
      // Silent in Expo Go - voice recognition requires native build
      // User can still type messages manually
      return;
    }

    if (isSending || isSpeaking) return;

    if (!currentBeneficiary?.id) {
      Alert.alert('Select Beneficiary', 'Please select a beneficiary first.',
        [{ text: 'Select', onPress: () => setShowBeneficiaryPicker(true) }, { text: 'Cancel' }]
      );
      return;
    }

    const result = await ExpoSpeechRecognitionModule.requestPermissionsAsync();
    if (!result.granted) {
      Alert.alert('Microphone Permission Required', 'Please grant microphone permission.');
      return;
    }

    setIsContinuousMode(true);
    Speech.stop();
    setIsSpeaking(false);

    ExpoSpeechRecognitionModule.start({
      lang: 'en-US',
      interimResults: true,
      maxAlternatives: 1,
      continuous: false,
    });
  };

  const stopListening = () => {
    if (ExpoSpeechRecognitionModule) {
      ExpoSpeechRecognitionModule.stop();
    }
    setIsListening(false);
    setIsContinuousMode(false);
  };

  const handleSendWithText = async (text: string) => {
    const trimmedInput = text.trim();
    if (!trimmedInput || isSending) return;
    if (!currentBeneficiary?.id) return;

    const now = Date.now();
    if (now - lastSendTimeRef.current < SEND_COOLDOWN_MS) return;
    lastSendTimeRef.current = now;

    const userMessage: Message = {
      id: Date.now().toString(),
      role: 'user',
      content: trimmedInput,
      timestamp: new Date(),
    };

    setMessages(prev => [...prev, userMessage]);
    setInput('');
    setRecognizedText('');
    setIsSending(true);

    try {
      const aiResponse = await sendToVoiceAsk(trimmedInput);
      const assistantMessage: Message = {
        id: (Date.now() + 1).toString(),
        role: 'assistant',
        content: aiResponse,
        timestamp: new Date(),
      };
      setMessages(prev => [...prev, assistantMessage]);
      await speakResponse(aiResponse, true);
    } catch (error) {
      const errorMessage: Message = {
        id: (Date.now() + 1).toString(),
        role: 'assistant',
        content: `Sorry, an error occurred: ${error instanceof Error ? error.message : 'Unknown error'}`,
        timestamp: new Date(),
      };
      setMessages(prev => [...prev, errorMessage]);
      if (isContinuousMode && currentBeneficiary?.id) {
        setTimeout(() => startListeningInternal(), 500);
      }
    } finally {
      setIsSending(false);
    }
  };

  const renderMessage = ({ item }: { item: Message }) => {
    const isUser = item.role === 'user';

    return (
      <View style={[styles.messageRow, isUser && styles.userMessageRow]}>
        {!isUser && (
          <View style={styles.avatarContainer}>
            <Ionicons name="mic" size={16} color={AppColors.white} />
          </View>
        )}
        <View style={[styles.messageBubble, isUser ? styles.userBubble : styles.assistantBubble]}>
          <Text style={[styles.messageText, isUser && styles.userMessageText]}>
            {item.content}
          </Text>
          <Text style={[styles.timestamp, isUser && styles.userTimestamp]}>
            {item.timestamp.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })}
          </Text>
        </View>
      </View>
    );
  };

  return (
    <SafeAreaView style={styles.container} edges={['top']}>
      {/* Header */}
      <View style={styles.header}>
        <View style={styles.headerLeft}>
          <View style={styles.headerAvatar}>
            <Ionicons name="mic" size={20} color={AppColors.white} />
          </View>
          <View>
            <Text style={styles.headerTitle}>Julia AI</Text>
            <Text style={styles.headerSubtitle}>
              {isSending ? 'Thinking...' : isListening ? 'Listening...' : isSpeaking ? 'Speaking...' :
                currentBeneficiary ? `Monitoring ${currentBeneficiary.name}` : 'Select a beneficiary'}
            </Text>
          </View>
        </View>
        <View style={styles.headerRight}>
          {DEV_MODE && (
            <TouchableOpacity style={styles.voiceSettingsButton} onPress={() => setShowVoicePicker(true)}>
              <Ionicons name="settings-outline" size={18} color={AppColors.accent} />
            </TouchableOpacity>
          )}
          <TouchableOpacity style={styles.beneficiaryButton} onPress={() => setShowBeneficiaryPicker(true)}>
            <Ionicons name="people-outline" size={18} color={AppColors.primary} />
            <Text style={styles.beneficiaryButtonText}>
              {currentBeneficiary?.name?.split(' ')[0] || 'Select'}
            </Text>
          </TouchableOpacity>
        </View>
      </View>

      {/* Messages */}
      <KeyboardAvoidingView
        style={styles.chatContainer}
        behavior={Platform.OS === 'ios' ? 'padding' : undefined}
        keyboardVerticalOffset={Platform.OS === 'ios' ? 90 : 0}
      >
        <FlatList
          ref={flatListRef}
          data={messages}
          keyExtractor={item => item.id}
          renderItem={renderMessage}
          contentContainerStyle={styles.messagesList}
          showsVerticalScrollIndicator={false}
          onContentSizeChange={() => flatListRef.current?.scrollToEnd({ animated: true })}
        />

        {/* Listening indicator */}
        {isListening && (
          <TouchableOpacity style={styles.listeningIndicator} onPress={stopListening}>
            <Animated.View style={{ transform: [{ scale: pulseAnim }] }}>
              <Ionicons name="mic" size={20} color={AppColors.error} />
            </Animated.View>
            <Text style={styles.listeningText}>
              {recognizedText || 'Listening... tap to stop'}
            </Text>
          </TouchableOpacity>
        )}

        {/* Speaking indicator */}
        {isSpeaking && !isListening && (
          <TouchableOpacity style={styles.speakingIndicator} onPress={stopSpeaking}>
            <Ionicons name="volume-high" size={20} color={AppColors.accent} />
            <Text style={styles.speakingText}>
              {isContinuousMode ? 'Live mode - Speaking...' : 'Speaking...'} tap to stop
            </Text>
          </TouchableOpacity>
        )}

        {/* Continuous mode indicator */}
        {isContinuousMode && !isListening && !isSpeaking && !isSending && (
          <TouchableOpacity style={styles.continuousModeIndicator} onPress={() => setIsContinuousMode(false)}>
            <Ionicons name="radio" size={20} color={AppColors.success} />
            <Text style={styles.continuousModeText}>Live chat active - tap to stop</Text>
          </TouchableOpacity>
        )}

        {/* Input */}
        <View style={styles.inputContainer}>
          <TouchableOpacity
            style={[
              styles.micButton,
              isListening && styles.micButtonActive,
              isContinuousMode && !isListening && styles.micButtonContinuous,
              !SPEECH_RECOGNITION_AVAILABLE && styles.micButtonDisabled,
            ]}
            onPress={isListening ? stopListening : startListening}
            disabled={isSending || !SPEECH_RECOGNITION_AVAILABLE}
          >
            <Ionicons
              name={SPEECH_RECOGNITION_AVAILABLE ? 'mic' : 'mic-off'}
              size={24}
              color={!SPEECH_RECOGNITION_AVAILABLE ? AppColors.textMuted : (isListening ? AppColors.white : (isContinuousMode ? AppColors.success : AppColors.primary))}
            />
          </TouchableOpacity>

          <View style={styles.inputWrapper}>
            <TextInput
              style={styles.input}
              placeholder="Type your question..."
              placeholderTextColor={AppColors.textMuted}
              value={input}
              onChangeText={setInput}
              multiline
              maxLength={1000}
              editable={!isSending}
              onSubmitEditing={handleSend}
            />
          </View>

          <TouchableOpacity
            style={[styles.sendButton, (!input.trim() || isSending) && styles.sendButtonDisabled]}
            onPress={handleSend}
            disabled={!input.trim() || isSending}
          >
            {isSending ? (
              <ActivityIndicator size="small" color={AppColors.white} />
            ) : (
              <Ionicons name="send" size={20} color={input.trim() ? AppColors.white : AppColors.textMuted} />
            )}
          </TouchableOpacity>
        </View>
      </KeyboardAvoidingView>

      {/* Beneficiary Picker Modal */}
      <Modal visible={showBeneficiaryPicker} animationType="slide" transparent>
        <View style={styles.modalOverlay}>
          <Animated.View style={[styles.modalBackdrop, { opacity: fadeAnim }]}>
            <TouchableOpacity style={StyleSheet.absoluteFill} onPress={() => setShowBeneficiaryPicker(false)} />
          </Animated.View>
          <View style={styles.modalContent}>
            <View style={styles.modalHeader}>
              <View style={styles.modalHeaderContent}>
                <View style={styles.modalIconContainer}>
                  <Ionicons name="people" size={22} color={AppColors.primary} />
                </View>
                <Text style={styles.modalTitle}>Select Beneficiary</Text>
              </View>
              <TouchableOpacity style={styles.modalCloseButton} onPress={() => setShowBeneficiaryPicker(false)}>
                <Ionicons name="close" size={22} color={AppColors.textSecondary} />
              </TouchableOpacity>
            </View>
            <ScrollView style={styles.beneficiaryList}>
              {beneficiaries.length === 0 ? (
                <View style={styles.emptyState}>
                  <ActivityIndicator size="large" color={AppColors.primary} />
                  <Text style={styles.emptyStateText}>Loading beneficiaries...</Text>
                </View>
              ) : (
                beneficiaries.map(beneficiary => (
                  <TouchableOpacity
                    key={beneficiary.id}
                    style={[styles.beneficiaryItem, currentBeneficiary?.id === beneficiary.id && styles.beneficiaryItemSelected]}
                    onPress={() => selectBeneficiary(beneficiary)}
                  >
                    <View style={styles.beneficiaryAvatar}>
                      <Text style={styles.beneficiaryAvatarText}>{beneficiary.name.charAt(0).toUpperCase()}</Text>
                    </View>
                    <View style={styles.beneficiaryInfo}>
                      <Text style={styles.beneficiaryName}>{beneficiary.name}</Text>
                      <Text style={styles.beneficiaryStatus}>
                        {beneficiary.wellness_descriptor || beneficiary.last_location || 'No data'}
                      </Text>
                    </View>
                    <View style={[styles.statusDot, { backgroundColor: beneficiary.status === 'online' ? AppColors.online : AppColors.offline }]} />
                  </TouchableOpacity>
                ))
              )}
            </ScrollView>
          </View>
        </View>
      </Modal>

      {/* Voice Picker Modal (DEV) */}
      {DEV_MODE && (
        <Modal visible={showVoicePicker} animationType="slide" transparent>
          <View style={styles.modalOverlay}>
            <Animated.View style={[styles.modalBackdrop, { opacity: fadeAnim }]}>
              <TouchableOpacity style={StyleSheet.absoluteFill} onPress={() => setShowVoicePicker(false)} />
            </Animated.View>
            <View style={[styles.modalContent, { maxHeight: '80%' }]}>
              <View style={styles.modalHeader}>
                <View style={styles.modalHeaderContent}>
                  <View style={[styles.modalIconContainer, { backgroundColor: AppColors.accentLight }]}>
                    <Ionicons name="settings" size={22} color={AppColors.accent} />
                  </View>
                  <View>
                    <Text style={styles.modalTitle}>Voice Settings</Text>
                    <Text style={styles.devBadge}>DEV ONLY</Text>
                  </View>
                </View>
                <TouchableOpacity style={styles.modalCloseButton} onPress={() => setShowVoicePicker(false)}>
                  <Ionicons name="close" size={22} color={AppColors.textSecondary} />
                </TouchableOpacity>
              </View>

              <View style={styles.currentVoiceInfo}>
                <Text style={styles.currentVoiceLabel}>Current: {selectedVoice.name}</Text>
                <TouchableOpacity style={styles.testVoiceButton} onPress={() => testVoice(selectedVoice)}>
                  <Ionicons name="play" size={16} color={AppColors.white} />
                  <Text style={styles.testVoiceButtonText}>Test</Text>
                </TouchableOpacity>
              </View>

              <ScrollView style={styles.voiceList} showsVerticalScrollIndicator={false}>
                <Text style={styles.voiceSectionTitle}>English Voices</Text>
                {AVAILABLE_VOICES.filter(v => v.language.startsWith('en-')).map(voice => (
                  <TouchableOpacity
                    key={voice.id}
                    style={[styles.voiceItem, selectedVoice.id === voice.id && styles.voiceItemSelected]}
                    onPress={() => setSelectedVoice(voice)}
                  >
                    <View style={styles.voiceItemInfo}>
                      <Text style={styles.voiceItemName}>{voice.name}</Text>
                      <Text style={styles.voiceItemLang}>{voice.language}</Text>
                    </View>
                    <View style={styles.voiceItemActions}>
                      <TouchableOpacity style={styles.playButton} onPress={() => testVoice(voice)}>
                        <Ionicons name="play-circle" size={24} color={AppColors.accent} />
                      </TouchableOpacity>
                      {selectedVoice.id === voice.id && (
                        <Ionicons name="checkmark-circle" size={24} color={AppColors.success} />
                      )}
                    </View>
                  </TouchableOpacity>
                ))}

                <Text style={styles.voiceSectionTitle}>Other Languages</Text>
                {AVAILABLE_VOICES.filter(v => !v.language.startsWith('en-')).map(voice => (
                  <TouchableOpacity
                    key={voice.id}
                    style={[styles.voiceItem, selectedVoice.id === voice.id && styles.voiceItemSelected]}
                    onPress={() => setSelectedVoice(voice)}
                  >
                    <View style={styles.voiceItemInfo}>
                      <Text style={styles.voiceItemName}>{voice.name}</Text>
                      <Text style={styles.voiceItemLang}>{voice.language}</Text>
                    </View>
                    <View style={styles.voiceItemActions}>
                      <TouchableOpacity style={styles.playButton} onPress={() => testVoice(voice)}>
                        <Ionicons name="play-circle" size={24} color={AppColors.accent} />
                      </TouchableOpacity>
                      {selectedVoice.id === voice.id && (
                        <Ionicons name="checkmark-circle" size={24} color={AppColors.success} />
                      )}
                    </View>
                  </TouchableOpacity>
                ))}
              </ScrollView>

              <TouchableOpacity
                style={styles.applyButton}
                onPress={() => {
                  setShowVoicePicker(false);
                  Speech.speak(`Voice changed to ${selectedVoice.name}`, {
                    language: selectedVoice.language,
                    voice: selectedVoice.voice,
                  });
                }}
              >
                <Text style={styles.applyButtonText}>Apply & Close</Text>
              </TouchableOpacity>
            </View>
          </View>
        </Modal>
      )}
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: AppColors.background,
  },
  // Header
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: Spacing.lg,
    paddingVertical: Spacing.md,
    borderBottomWidth: 1,
    borderBottomColor: AppColors.border,
  },
  headerLeft: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: Spacing.md,
  },
  headerAvatar: {
    width: 44,
    height: 44,
    borderRadius: BorderRadius.lg,
    backgroundColor: AppColors.accent,
    justifyContent: 'center',
    alignItems: 'center',
  },
  headerTitle: {
    fontSize: FontSizes.lg,
    fontWeight: FontWeights.semibold,
    color: AppColors.textPrimary,
  },
  headerSubtitle: {
    fontSize: FontSizes.sm,
    color: AppColors.success,
    fontWeight: FontWeights.medium,
  },
  headerRight: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: Spacing.sm,
  },
  voiceSettingsButton: {
    width: 36,
    height: 36,
    borderRadius: BorderRadius.md,
    backgroundColor: AppColors.accentLight,
    justifyContent: 'center',
    alignItems: 'center',
  },
  beneficiaryButton: {
    flexDirection: 'row',
    alignItems: 'center',
    paddingHorizontal: Spacing.md,
    paddingVertical: Spacing.sm,
    backgroundColor: AppColors.primarySubtle,
    borderRadius: BorderRadius.lg,
    gap: Spacing.xs,
  },
  beneficiaryButtonText: {
    fontSize: FontSizes.sm,
    color: AppColors.primary,
    fontWeight: FontWeights.medium,
  },
  // Chat
  chatContainer: {
    flex: 1,
  },
  messagesList: {
    padding: Spacing.lg,
    paddingBottom: Spacing.xl,
  },
  messageRow: {
    flexDirection: 'row',
    marginBottom: Spacing.md,
    alignItems: 'flex-end',
  },
  userMessageRow: {
    justifyContent: 'flex-end',
  },
  avatarContainer: {
    width: 32,
    height: 32,
    borderRadius: BorderRadius.md,
    backgroundColor: AppColors.accent,
    justifyContent: 'center',
    alignItems: 'center',
    marginRight: Spacing.sm,
  },
  messageBubble: {
    maxWidth: '75%',
    padding: Spacing.md,
    borderRadius: BorderRadius.xl,
  },
  userBubble: {
    backgroundColor: AppColors.primary,
    borderBottomRightRadius: BorderRadius.xs,
    ...Shadows.sm,
  },
  assistantBubble: {
    backgroundColor: AppColors.surface,
    borderBottomLeftRadius: BorderRadius.xs,
    ...Shadows.xs,
  },
  messageText: {
    fontSize: FontSizes.base,
    lineHeight: 22,
    color: AppColors.textPrimary,
  },
  userMessageText: {
    color: AppColors.white,
  },
  timestamp: {
    fontSize: FontSizes.xs,
    color: AppColors.textMuted,
    marginTop: Spacing.xs,
    alignSelf: 'flex-end',
  },
  userTimestamp: {
    color: 'rgba(255,255,255,0.7)',
  },
  // Indicators
  listeningIndicator: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    paddingVertical: Spacing.sm,
    paddingHorizontal: Spacing.md,
    backgroundColor: AppColors.errorLight,
    marginHorizontal: Spacing.lg,
    borderRadius: BorderRadius.lg,
    marginBottom: Spacing.sm,
  },
  listeningText: {
    fontSize: FontSizes.sm,
    color: AppColors.error,
    fontWeight: FontWeights.medium,
    marginLeft: Spacing.sm,
    flex: 1,
  },
  speakingIndicator: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    paddingVertical: Spacing.sm,
    paddingHorizontal: Spacing.md,
    backgroundColor: AppColors.accentLight,
    marginHorizontal: Spacing.lg,
    borderRadius: BorderRadius.lg,
    marginBottom: Spacing.sm,
  },
  speakingText: {
    fontSize: FontSizes.sm,
    color: AppColors.accent,
    fontWeight: FontWeights.medium,
    marginLeft: Spacing.sm,
  },
  continuousModeIndicator: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    paddingVertical: Spacing.sm,
    paddingHorizontal: Spacing.md,
    backgroundColor: AppColors.successLight,
    marginHorizontal: Spacing.lg,
    borderRadius: BorderRadius.lg,
    marginBottom: Spacing.sm,
  },
  continuousModeText: {
    fontSize: FontSizes.sm,
    color: AppColors.success,
    fontWeight: FontWeights.medium,
    marginLeft: Spacing.sm,
  },
  // Input
  inputContainer: {
    flexDirection: 'row',
    alignItems: 'flex-end',
    padding: Spacing.md,
    paddingHorizontal: Spacing.lg,
    backgroundColor: AppColors.surface,
    borderTopWidth: 1,
    borderTopColor: AppColors.border,
    gap: Spacing.sm,
  },
  micButton: {
    width: 48,
    height: 48,
    borderRadius: BorderRadius.lg,
    backgroundColor: AppColors.primarySubtle,
    justifyContent: 'center',
    alignItems: 'center',
    borderWidth: 2,
    borderColor: AppColors.primary,
  },
  micButtonActive: {
    backgroundColor: AppColors.error,
    borderColor: AppColors.error,
  },
  micButtonContinuous: {
    borderColor: AppColors.success,
    backgroundColor: AppColors.successLight,
  },
  micButtonDisabled: {
    borderColor: AppColors.borderLight,
    backgroundColor: AppColors.surfaceSecondary,
    opacity: 0.6,
  },
  inputWrapper: {
    flex: 1,
    backgroundColor: AppColors.surfaceSecondary,
    borderRadius: BorderRadius.xl,
    borderWidth: 1.5,
    borderColor: AppColors.borderLight,
  },
  input: {
    paddingHorizontal: Spacing.md,
    paddingVertical: Spacing.sm,
    fontSize: FontSizes.base,
    color: AppColors.textPrimary,
    maxHeight: 100,
  },
  sendButton: {
    width: 48,
    height: 48,
    borderRadius: BorderRadius.lg,
    backgroundColor: AppColors.primary,
    justifyContent: 'center',
    alignItems: 'center',
    ...Shadows.primary,
  },
  sendButtonDisabled: {
    backgroundColor: AppColors.surfaceSecondary,
    shadowOpacity: 0,
  },
  // Modal
  modalOverlay: {
    flex: 1,
    justifyContent: 'flex-end',
  },
  modalBackdrop: {
    ...StyleSheet.absoluteFillObject,
    backgroundColor: AppColors.overlay,
  },
  modalContent: {
    backgroundColor: AppColors.background,
    borderTopLeftRadius: BorderRadius['2xl'],
    borderTopRightRadius: BorderRadius['2xl'],
    maxHeight: '70%',
    ...Shadows.xl,
  },
  modalHeader: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: Spacing.lg,
    paddingVertical: Spacing.lg,
    borderBottomWidth: 1,
    borderBottomColor: AppColors.border,
  },
  modalHeaderContent: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: Spacing.md,
  },
  modalIconContainer: {
    width: 40,
    height: 40,
    borderRadius: BorderRadius.lg,
    backgroundColor: AppColors.primaryLighter,
    justifyContent: 'center',
    alignItems: 'center',
  },
  modalTitle: {
    fontSize: FontSizes.xl,
    fontWeight: FontWeights.bold,
    color: AppColors.textPrimary,
  },
  modalCloseButton: {
    width: 36,
    height: 36,
    borderRadius: BorderRadius.md,
    backgroundColor: AppColors.surfaceSecondary,
    justifyContent: 'center',
    alignItems: 'center',
  },
  devBadge: {
    fontSize: FontSizes.xs,
    color: AppColors.error,
    fontWeight: FontWeights.semibold,
  },
  beneficiaryList: {
    padding: Spacing.lg,
  },
  beneficiaryItem: {
    flexDirection: 'row',
    alignItems: 'center',
    padding: Spacing.md,
    backgroundColor: AppColors.surface,
    borderRadius: BorderRadius.xl,
    marginBottom: Spacing.sm,
    ...Shadows.xs,
  },
  beneficiaryItemSelected: {
    backgroundColor: AppColors.primarySubtle,
    borderWidth: 2,
    borderColor: AppColors.primary,
  },
  beneficiaryAvatar: {
    width: 44,
    height: 44,
    borderRadius: BorderRadius.lg,
    backgroundColor: AppColors.primaryLighter,
    justifyContent: 'center',
    alignItems: 'center',
    marginRight: Spacing.md,
  },
  beneficiaryAvatarText: {
    fontSize: FontSizes.lg,
    fontWeight: FontWeights.bold,
    color: AppColors.primary,
  },
  beneficiaryInfo: {
    flex: 1,
  },
  beneficiaryName: {
    fontSize: FontSizes.base,
    fontWeight: FontWeights.semibold,
    color: AppColors.textPrimary,
  },
  beneficiaryStatus: {
    fontSize: FontSizes.sm,
    color: AppColors.textMuted,
    marginTop: 2,
  },
  statusDot: {
    width: 12,
    height: 12,
    borderRadius: 6,
  },
  emptyState: {
    alignItems: 'center',
    padding: Spacing.xl,
  },
  emptyStateText: {
    marginTop: Spacing.md,
    fontSize: FontSizes.base,
    color: AppColors.textMuted,
  },
  // Voice Picker
  currentVoiceInfo: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    padding: Spacing.md,
    paddingHorizontal: Spacing.lg,
    backgroundColor: AppColors.accentLight,
    borderBottomWidth: 1,
    borderBottomColor: AppColors.border,
  },
  currentVoiceLabel: {
    fontSize: FontSizes.base,
    color: AppColors.textPrimary,
    fontWeight: FontWeights.medium,
    flex: 1,
  },
  testVoiceButton: {
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: AppColors.accent,
    paddingHorizontal: Spacing.md,
    paddingVertical: Spacing.sm,
    borderRadius: BorderRadius.lg,
    gap: Spacing.xs,
  },
  testVoiceButtonText: {
    color: AppColors.white,
    fontSize: FontSizes.sm,
    fontWeight: FontWeights.semibold,
  },
  voiceList: {
    padding: Spacing.lg,
  },
  voiceSectionTitle: {
    fontSize: FontSizes.xs,
    fontWeight: FontWeights.semibold,
    color: AppColors.textMuted,
    textTransform: 'uppercase',
    letterSpacing: 0.5,
    marginTop: Spacing.md,
    marginBottom: Spacing.sm,
  },
  voiceItem: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    padding: Spacing.md,
    backgroundColor: AppColors.surface,
    borderRadius: BorderRadius.lg,
    marginBottom: Spacing.sm,
    ...Shadows.xs,
  },
  voiceItemSelected: {
    backgroundColor: AppColors.accentLight,
    borderWidth: 1,
    borderColor: AppColors.accent,
  },
  voiceItemInfo: {
    flex: 1,
  },
  voiceItemName: {
    fontSize: FontSizes.base,
    color: AppColors.textPrimary,
    fontWeight: FontWeights.medium,
  },
  voiceItemLang: {
    fontSize: FontSizes.xs,
    color: AppColors.textMuted,
    marginTop: 2,
  },
  voiceItemActions: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: Spacing.sm,
  },
  playButton: {
    padding: Spacing.xs,
  },
  applyButton: {
    backgroundColor: AppColors.accent,
    margin: Spacing.lg,
    padding: Spacing.md,
    borderRadius: BorderRadius.lg,
    alignItems: 'center',
    ...Shadows.primary,
  },
  applyButtonText: {
    color: AppColors.white,
    fontSize: FontSizes.base,
    fontWeight: FontWeights.semibold,
  },
});