/**
 * Voice Debug Screen
 * Shows transcript logs from voice calls for debugging
 * Allows easy copying of logs
 */

import React, { useCallback } from 'react';
import {
  View,
  Text,
  StyleSheet,
  TouchableOpacity,
  ScrollView,
  Alert,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import { Ionicons, Feather } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import * as Clipboard from 'expo-clipboard';
import { AppColors, BorderRadius, FontSizes, Spacing } from '@/constants/theme';
import { useVoiceTranscript } from '@/contexts/VoiceTranscriptContext';

export default function VoiceDebugScreen() {
  const router = useRouter();
  const { transcript, clearTranscript, hasNewTranscript, markTranscriptAsShown, addTranscriptEntry } = useVoiceTranscript();

  // Mark as shown when viewed
  React.useEffect(() => {
    if (hasNewTranscript) {
      markTranscriptAsShown();
    }
  }, [hasNewTranscript, markTranscriptAsShown]);

  // Copy all logs to clipboard
  const copyAllLogs = useCallback(async () => {
    if (transcript.length === 0) {
      Alert.alert('No logs', 'There are no voice call logs to copy.');
      return;
    }

    const logsText = transcript
      .map((entry) => {
        const time = entry.timestamp.toLocaleTimeString();
        const speaker = entry.role === 'user' ? 'USER' : 'JULIA';
        return `[${time}] ${speaker}: ${entry.text}`;
      })
      .join('\n\n');

    const header = `=== Voice Call Transcript ===\n${new Date().toLocaleString()}\nTotal entries: ${transcript.length}\n\n`;

    await Clipboard.setStringAsync(header + logsText);
    Alert.alert('Copied!', 'Voice call logs copied to clipboard.');
  }, [transcript]);

  // Copy single entry
  const copySingleEntry = useCallback(async (text: string) => {
    await Clipboard.setStringAsync(text);
    Alert.alert('Copied!', 'Message copied to clipboard.');
  }, []);

  // Clear all logs
  const handleClearLogs = useCallback(() => {
    Alert.alert(
      'Clear Logs',
      'Are you sure you want to clear all voice call logs?',
      [
        { text: 'Cancel', style: 'cancel' },
        {
          text: 'Clear',
          style: 'destructive',
          onPress: clearTranscript,
        },
      ]
    );
  }, [clearTranscript]);

  // Start a new voice call
  const startVoiceCall = useCallback(() => {
    router.push('/voice-call');
  }, [router]);

  // Add mock data for testing (simulator has no microphone)
  const addMockData = useCallback(() => {
    const mockConversation = [
      { role: 'assistant' as const, text: "Hi! I have some concerns about Ferdinand today - there was an incident this morning. Want me to tell you more?" },
      { role: 'user' as const, text: "Yes, what happened?" },
      { role: 'assistant' as const, text: "Ferdinand had a fall at 6:32 AM in the bathroom. He was able to get up on his own, but I recommend checking in with him. His sleep was also shorter than usual - only 5 hours last night." },
      { role: 'user' as const, text: "Did he take his medications?" },
      { role: 'assistant' as const, text: "Yes, he took his morning medications at 8:15 AM. All on schedule. Would you like me to show you the dashboard with more details?" },
      { role: 'user' as const, text: "Show me the dashboard" },
      { role: 'assistant' as const, text: "Navigating to Dashboard now. You can see the 7-day overview there." },
    ];

    mockConversation.forEach((entry, index) => {
      setTimeout(() => {
        addTranscriptEntry(entry.role, entry.text);
      }, index * 100);
    });

    Alert.alert('Mock Data Added', 'Sample voice conversation added for testing.');
  }, [addTranscriptEntry]);

  return (
    <SafeAreaView style={styles.container} edges={['top']}>
      {/* Header */}
      <View style={styles.header}>
        <View style={styles.headerLeft}>
          <Feather name="terminal" size={24} color={AppColors.primary} />
          <Text style={styles.headerTitle}>Voice Debug</Text>
        </View>
        <View style={styles.headerButtons}>
          {transcript.length > 0 && (
            <>
              <TouchableOpacity style={styles.headerButton} onPress={copyAllLogs}>
                <Ionicons name="copy-outline" size={22} color={AppColors.primary} />
              </TouchableOpacity>
              <TouchableOpacity style={styles.headerButton} onPress={handleClearLogs}>
                <Ionicons name="trash-outline" size={22} color={AppColors.error} />
              </TouchableOpacity>
            </>
          )}
        </View>
      </View>

      {/* Start Call Button */}
      <View style={styles.callButtonContainer}>
        <TouchableOpacity style={styles.callButton} onPress={startVoiceCall}>
          <Ionicons name="call" size={24} color={AppColors.white} />
          <Text style={styles.callButtonText}>Start Voice Call</Text>
        </TouchableOpacity>
        {/* Mock Data Button for simulator testing */}
        <TouchableOpacity style={styles.mockDataButton} onPress={addMockData}>
          <Feather name="plus-circle" size={20} color={AppColors.primary} />
          <Text style={styles.mockDataButtonText}>Add Mock Data</Text>
        </TouchableOpacity>
      </View>

      {/* Logs Section */}
      <View style={styles.logsHeader}>
        <Text style={styles.logsTitle}>Call Transcript</Text>
        <Text style={styles.logsCount}>
          {transcript.length} {transcript.length === 1 ? 'entry' : 'entries'}
        </Text>
      </View>

      {/* Transcript List */}
      <ScrollView style={styles.logsList} contentContainerStyle={styles.logsContent}>
        {transcript.length === 0 ? (
          <View style={styles.emptyState}>
            <Feather name="mic-off" size={48} color={AppColors.textMuted} />
            <Text style={styles.emptyTitle}>No voice logs yet</Text>
            <Text style={styles.emptySubtitle}>
              Start a voice call with Julia AI to see the transcript here.
            </Text>
          </View>
        ) : (
          transcript.map((entry) => (
            <TouchableOpacity
              key={entry.id}
              style={[
                styles.logEntry,
                entry.role === 'user' ? styles.logEntryUser : styles.logEntryAssistant,
              ]}
              onLongPress={() => copySingleEntry(entry.text)}
              activeOpacity={0.7}
            >
              <View style={styles.logEntryHeader}>
                <View style={styles.logEntrySpeaker}>
                  <Ionicons
                    name={entry.role === 'user' ? 'person' : 'sparkles'}
                    size={14}
                    color={entry.role === 'user' ? AppColors.primary : AppColors.success}
                  />
                  <Text
                    style={[
                      styles.logEntrySpeakerText,
                      { color: entry.role === 'user' ? AppColors.primary : AppColors.success },
                    ]}
                  >
                    {entry.role === 'user' ? 'You' : 'Julia'}
                  </Text>
                </View>
                <Text style={styles.logEntryTime}>
                  {entry.timestamp.toLocaleTimeString()}
                </Text>
              </View>
              <Text style={styles.logEntryText} selectable>
                {entry.text}
              </Text>
              <Text style={styles.logEntryHint}>Long press to copy</Text>
            </TouchableOpacity>
          ))
        )}
      </ScrollView>

      {/* Footer hint */}
      {transcript.length > 0 && (
        <View style={styles.footer}>
          <Text style={styles.footerText}>
            Tap the copy icon to copy all logs
          </Text>
        </View>
      )}
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: AppColors.background,
  },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: Spacing.md,
    paddingVertical: Spacing.sm,
    borderBottomWidth: 1,
    borderBottomColor: AppColors.border,
  },
  headerLeft: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: Spacing.sm,
  },
  headerTitle: {
    fontSize: FontSizes.xl,
    fontWeight: '700',
    color: AppColors.textPrimary,
  },
  headerButtons: {
    flexDirection: 'row',
    gap: Spacing.sm,
  },
  headerButton: {
    padding: Spacing.xs,
    borderRadius: BorderRadius.md,
    backgroundColor: AppColors.surface,
  },
  callButtonContainer: {
    paddingHorizontal: Spacing.md,
    paddingVertical: Spacing.md,
  },
  callButton: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    gap: Spacing.sm,
    backgroundColor: AppColors.success,
    paddingVertical: Spacing.md,
    borderRadius: BorderRadius.lg,
    shadowColor: AppColors.success,
    shadowOffset: { width: 0, height: 4 },
    shadowOpacity: 0.3,
    shadowRadius: 8,
    elevation: 4,
  },
  callButtonText: {
    fontSize: FontSizes.lg,
    fontWeight: '600',
    color: AppColors.white,
  },
  mockDataButton: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    gap: Spacing.xs,
    marginTop: Spacing.sm,
    paddingVertical: Spacing.sm,
    borderRadius: BorderRadius.md,
    borderWidth: 1,
    borderColor: AppColors.primary,
    backgroundColor: 'transparent',
  },
  mockDataButtonText: {
    fontSize: FontSizes.sm,
    fontWeight: '500',
    color: AppColors.primary,
  },
  logsHeader: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: Spacing.md,
    paddingVertical: Spacing.sm,
    borderBottomWidth: 1,
    borderBottomColor: AppColors.border,
  },
  logsTitle: {
    fontSize: FontSizes.base,
    fontWeight: '600',
    color: AppColors.textPrimary,
  },
  logsCount: {
    fontSize: FontSizes.sm,
    color: AppColors.textMuted,
  },
  logsList: {
    flex: 1,
  },
  logsContent: {
    padding: Spacing.md,
    gap: Spacing.sm,
  },
  emptyState: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    paddingVertical: Spacing.xxl * 2,
  },
  emptyTitle: {
    fontSize: FontSizes.lg,
    fontWeight: '600',
    color: AppColors.textPrimary,
    marginTop: Spacing.md,
  },
  emptySubtitle: {
    fontSize: FontSizes.sm,
    color: AppColors.textMuted,
    textAlign: 'center',
    marginTop: Spacing.xs,
    paddingHorizontal: Spacing.xl,
  },
  logEntry: {
    padding: Spacing.md,
    borderRadius: BorderRadius.lg,
    marginBottom: Spacing.sm,
  },
  logEntryUser: {
    backgroundColor: 'rgba(33, 150, 243, 0.1)',
    borderLeftWidth: 3,
    borderLeftColor: AppColors.primary,
  },
  logEntryAssistant: {
    backgroundColor: 'rgba(76, 175, 80, 0.1)',
    borderLeftWidth: 3,
    borderLeftColor: AppColors.success,
  },
  logEntryHeader: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    marginBottom: Spacing.xs,
  },
  logEntrySpeaker: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 4,
  },
  logEntrySpeakerText: {
    fontSize: FontSizes.sm,
    fontWeight: '600',
  },
  logEntryTime: {
    fontSize: FontSizes.xs,
    color: AppColors.textMuted,
  },
  logEntryText: {
    fontSize: FontSizes.base,
    color: AppColors.textPrimary,
    lineHeight: 22,
  },
  logEntryHint: {
    fontSize: FontSizes.xs,
    color: AppColors.textMuted,
    marginTop: Spacing.xs,
    fontStyle: 'italic',
  },
  footer: {
    padding: Spacing.md,
    alignItems: 'center',
    borderTopWidth: 1,
    borderTopColor: AppColors.border,
  },
  footerText: {
    fontSize: FontSizes.sm,
    color: AppColors.textMuted,
  },
});