'use client';

import React, { useState } from 'react';
import {
  Fab,
  Tooltip,
  Snackbar,
  Alert,
  Dialog,
  DialogTitle,
  DialogContent,
  DialogActions,
  Button,
  Box,
  Typography,
  CircularProgress,
  Chip,
  IconButton,
  Select,
  MenuItem,
  FormControl,
  InputLabel,
} from '@mui/material';
import MicIcon from '@mui/icons-material/Mic';
import MicOffIcon from '@mui/icons-material/MicOff';
import AddIcon from '@mui/icons-material/Add';
import { useRouter } from 'next/navigation';
import { useVoiceInput } from '@/hooks/useVoiceInput';
import { useAuth } from '@/lib/auth/AuthContext';
import { trackingApi } from '@/lib/api/tracking';
import { childrenApi } from '@/lib/api/children';
import { voiceApi } from '@/lib/api/voice';
import { VoiceActivityReview } from './VoiceActivityReview';

/**
 * Floating voice input button
 *
 * Always visible floating action button for quick voice commands.
 * Positioned in bottom-right corner for easy thumb access.
 */
export function VoiceFloatingButton() {
  const router = useRouter();
  const { user } = useAuth();
  const [open, setOpen] = useState(false);
  const [isProcessing, setIsProcessing] = useState(false);
  const [processingStatus, setProcessingStatus] = useState<'listening' | 'understanding' | 'saving' | null>(null);
  const [identifiedActivity, setIdentifiedActivity] = useState<string>('');
  const [classificationResult, setClassificationResult] = useState<any>(null);
  const [processedClassificationId, setProcessedClassificationId] = useState<string | null>(null);
  const [showReview, setShowReview] = useState(false);
  const [showUnknownDialog, setShowUnknownDialog] = useState(false);
  const [manualTrackingType, setManualTrackingType] = useState<string>('feeding');
  const [snackbar, setSnackbar] = useState<{
    open: boolean;
    message: string;
    severity: 'success' | 'info' | 'warning' | 'error';
  }>({
    open: false,
    message: '',
    severity: 'info',
  });

  const familyId = user?.families?.[0]?.familyId;

  const { isListening, isSupported, transcript, classification, error, usesFallback, startListening, stopListening, reset } =
    useVoiceInput();

  // Set status when listening starts/stops
  React.useEffect(() => {
    console.log('[VoiceFloatingButton] isListening changed:', isListening, 'processingStatus:', processingStatus);

    if (isListening && processingStatus !== 'listening') {
      console.log('[VoiceFloatingButton] Setting status to listening');
      setProcessingStatus('listening');
    } else if (!isListening && processingStatus === 'listening') {
      // When listening stops, transition to understanding
      console.log('[VoiceFloatingButton] Setting status to understanding');
      setProcessingStatus('understanding');
    }
  }, [isListening, processingStatus]);

  // Auto-use classification from backend when transcription completes
  // MediaRecorder sends audio to backend, which transcribes + classifies in one call
  React.useEffect(() => {
    // Create a unique ID for this classification based on transcript + type + timestamp
    const classificationId = classification
      ? `${transcript}-${classification.type}-${classification.timestamp}`
      : null;

    // Only process if we haven't already processed this exact classification
    if (classification && !isListening && !isProcessing && open && classificationId !== processedClassificationId) {
      console.log('[Voice] New classification detected, showing review...', classificationId);
      setProcessedClassificationId(classificationId);
      setClassificationResult(classification);

      // Show review dialog instead of immediately creating activity
      if (classification.type !== 'unknown' && classification.confidence >= 0.3) {
        setProcessingStatus(null);
        setShowReview(true);
      } else {
        // For unknown or low confidence, show unknown dialog
        setProcessingStatus(null);
        setOpen(false);
        setShowUnknownDialog(true);
      }
    }
  }, [classification, isListening, isProcessing, open, transcript, processedClassificationId]);

  const handleOpen = () => {
    if (!isSupported) {
      setSnackbar({
        open: true,
        message: 'Voice input not supported in this browser. Please use Chrome, Edge, or Safari.',
        severity: 'error',
      });
      return;
    }
    setOpen(true);
    reset();
    setClassificationResult(null);
    setProcessingStatus(null);
    setIdentifiedActivity('');
    setProcessedClassificationId(null);

    // Auto-start listening after dialog opens
    setTimeout(() => {
      startListening();
    }, 300);
  };

  const handleClose = () => {
    if (isListening) {
      stopListening();
    }
    setOpen(false);
    reset();
    setClassificationResult(null);
    setProcessingStatus(null);
    setIdentifiedActivity('');
    setProcessedClassificationId(null);
  };

  const handleStartListening = () => {
    reset();
    setClassificationResult(null);
    setProcessedClassificationId(null);
    startListening();
  };

  const handleStopListening = () => {
    stopListening();
  };

  const createActivity = async (activityType: string, activityDetails: Record<string, any>, activityTimestamp?: Date) => {
    // Get the first child from the family
    if (!familyId) {
      console.log('[Voice] No familyId found');
      throw new Error('No family found. Please set up your profile first.');
    }

    console.log('[Voice] Family ID:', familyId);

    // Fetch children
    console.log('[Voice] Fetching children for family:', familyId);
    const children = await childrenApi.getChildren(familyId);
    console.log('[Voice] Children found:', children.length, children);

    if (children.length === 0) {
      throw new Error('No children found. Please add a child first.');
    }

    // Use the first child
    const childId = children[0].id;
    console.log('[Voice] Using child ID:', childId);

    // Create the activity - use frontend API format (trackingApi transforms to backend DTO)
    const activityData = {
      type: activityType,
      timestamp: activityTimestamp ? new Date(activityTimestamp).toISOString() : new Date().toISOString(),
      data: activityDetails,
      notes: activityDetails.notes || undefined,
    };

    console.log('[Voice] Creating activity with data:', JSON.stringify(activityData, null, 2));

    const createdActivity = await trackingApi.createActivity(childId, activityData);
    console.log('[Voice] Activity created successfully:', createdActivity);

    return { childId, activity: createdActivity };
  };

  const saveFeedback = async (action: 'approved' | 'edited' | 'rejected', finalData?: Record<string, any>, childId?: string, activityId?: string) => {
    try {
      await voiceApi.saveFeedback({
        childId,
        activityId,
        transcript,
        language: classificationResult?.language || 'en',
        extractedType: classificationResult.type,
        extractedData: classificationResult.details,
        confidence: classificationResult.confidence,
        action,
        finalType: action === 'edited' ? classificationResult.type : undefined,
        finalData: action === 'edited' ? finalData : undefined,
      });
      console.log(`[Voice] Feedback saved: ${action}`);
    } catch (error) {
      console.error('[Voice] Failed to save feedback:', error);
      // Don't throw - feedback is nice-to-have, not critical
    }
  };

  const handleApprove = async (data: any) => {
    try {
      setIsProcessing(true);
      setIdentifiedActivity(data.type); // Set the activity type for display
      setProcessingStatus('saving');
      setShowReview(false);

      const { childId, activity } = await createActivity(data.type, data.details, data.timestamp);

      // Save feedback
      await saveFeedback('approved', undefined, childId, activity.id);

      // Show success message
      const activityLabel = data.type.charAt(0).toUpperCase() + data.type.slice(1);
      setSnackbar({
        open: true,
        message: `${activityLabel} activity saved successfully!`,
        severity: 'success',
      });

      // Auto-close dialog
      setTimeout(() => {
        handleClose();
      }, 1500);
    } catch (error: any) {
      console.error('[Voice] Failed to create activity:', error);
      setSnackbar({
        open: true,
        message: error.message || 'Failed to save activity. Please try again.',
        severity: 'error',
      });
    } finally {
      setIsProcessing(false);
      setProcessingStatus(null);
    }
  };

  const handleEdit = async (editedData: any) => {
    try {
      setIsProcessing(true);
      setIdentifiedActivity(editedData.type); // Set the activity type for display
      setProcessingStatus('saving');
      setShowReview(false);

      const { childId, activity } = await createActivity(editedData.type, editedData.details, editedData.timestamp);

      // Save feedback with edited data
      await saveFeedback('edited', editedData.details, childId, activity.id);

      // Show success message
      const activityLabel = editedData.type.charAt(0).toUpperCase() + editedData.type.slice(1);
      setSnackbar({
        open: true,
        message: `${activityLabel} activity saved with your edits!`,
        severity: 'success',
      });

      // Auto-close dialog
      setTimeout(() => {
        handleClose();
      }, 1500);
    } catch (error: any) {
      console.error('[Voice] Failed to create edited activity:', error);
      setSnackbar({
        open: true,
        message: error.message || 'Failed to save activity. Please try again.',
        severity: 'error',
      });
    } finally {
      setIsProcessing(false);
      setProcessingStatus(null);
    }
  };

  const handleReject = async () => {
    try {
      setShowReview(false);

      // Save feedback
      await saveFeedback('rejected');

      setSnackbar({
        open: true,
        message: 'Voice command rejected. Try again or use manual entry.',
        severity: 'info',
      });
    } catch (error) {
      console.error('[Voice] Failed to save rejection feedback:', error);
    }
  };

  const handleCloseSnackbar = () => {
    setSnackbar(prev => ({ ...prev, open: false }));
  };

  const handleRetry = () => {
    setShowUnknownDialog(false);
    setOpen(true);
    reset();
    setClassificationResult(null);
    setProcessingStatus(null);
    setProcessedClassificationId(null);
    // Auto-start listening
    setTimeout(() => {
      startListening();
    }, 300);
  };

  const handleManualTracking = () => {
    setShowUnknownDialog(false);
    router.push(`/track/${manualTrackingType}`);
  };

  return (
    <>
      {/* Floating button positioned in bottom-right - Hidden on desktop since we have TabBar center button */}
      <Tooltip title="Voice Command (Beta)" placement="left">
        <Fab
          color="primary"
          aria-label="voice input"
          onClick={handleOpen}
          disabled={!isSupported}
          sx={{
            position: 'fixed',
            bottom: 24,
            right: 24,
            zIndex: 1000,
            display: 'none', // Hidden - using TabBar center button instead
          }}
        >
          <MicIcon />
        </Fab>
      </Tooltip>

      {/* Voice input dialog */}
      <Dialog
        open={open}
        onClose={handleClose}
        maxWidth="sm"
        fullWidth
        aria-labelledby="voice-dialog-title"
        aria-describedby="voice-dialog-status"
      >
        <DialogTitle id="voice-dialog-title">
          Voice Command
          {classificationResult && !classificationResult.error && (
            <Chip
              label={`${classificationResult.type || classificationResult.intent} (${classificationResult.confidenceLevel || Math.round((classificationResult.confidence || 0) * 100) + '%'})`}
              color="success"
              size="small"
              sx={{ ml: 2 }}
              aria-label={`Detected activity: ${classificationResult.type || classificationResult.intent}, confidence ${classificationResult.confidenceLevel || Math.round((classificationResult.confidence || 0) * 100) + ' percent'}`}
            />
          )}
        </DialogTitle>

        <DialogContent>
          <Box sx={{ textAlign: 'center', py: 3 }}>
            {/* Microphone animation */}
            <Box sx={{ position: 'relative', display: 'inline-block', mb: 3 }}>
              <IconButton
                color={isListening ? 'error' : 'primary'}
                onClick={isListening ? handleStopListening : handleStartListening}
                aria-label={isListening ? 'Stop listening' : 'Start listening'}
                aria-pressed={isListening}
                sx={{
                  width: 80,
                  height: 80,
                  bgcolor: isListening ? 'error.light' : 'primary.light',
                  '&:hover': {
                    bgcolor: isListening ? 'error.main' : 'primary.main',
                  },
                  animation: isListening ? 'pulse 1.5s infinite' : 'none',
                  '@keyframes pulse': {
                    '0%': { transform: 'scale(1)', opacity: 1 },
                    '50%': { transform: 'scale(1.1)', opacity: 0.8 },
                    '100%': { transform: 'scale(1)', opacity: 1 },
                  },
                }}
              >
                {isListening ? <MicIcon sx={{ fontSize: 48 }} aria-hidden="true" /> : <MicOffIcon sx={{ fontSize: 48 }} aria-hidden="true" />}
              </IconButton>
            </Box>

            {/* Status text with detailed processing stages */}
            <Typography variant="body1" color="text.secondary" gutterBottom id="voice-dialog-status" role="status" aria-live="polite">
              {processingStatus === 'listening' && 'Listening... Speak now'}
              {processingStatus === 'understanding' && 'Understanding your request...'}
              {processingStatus === 'saving' && identifiedActivity && `Adding to ${identifiedActivity.charAt(0).toUpperCase() + identifiedActivity.slice(1)} tracker...`}
              {!processingStatus && !isListening && 'Click the microphone to start'}
            </Typography>

            {/* Transcript */}
            {transcript && (
              <Box sx={{ mt: 3, p: 2, bgcolor: 'grey.100', borderRadius: 1 }}>
                <Typography variant="body2" color="text.secondary" gutterBottom>
                  Transcript:
                </Typography>
                <Typography variant="body1">{transcript}</Typography>
              </Box>
            )}

            {/* Processing indicator with status */}
            {processingStatus && (
              <Box sx={{ mt: 2, display: 'flex', alignItems: 'center', justifyContent: 'center' }} role="status" aria-live="polite">
                <CircularProgress size={20} sx={{ mr: 1 }} aria-hidden="true" />
                <Typography variant="body2" color="text.secondary">
                  {processingStatus === 'listening' && 'Listening...'}
                  {processingStatus === 'understanding' && 'Understanding...'}
                  {processingStatus === 'saving' && 'Saving...'}
                </Typography>
              </Box>
            )}

            {/* Classification result */}
            {classificationResult && !classificationResult.error && (
              <Alert severity="success" sx={{ mt: 2 }} role="status">
                <Typography variant="body2" gutterBottom>
                  <strong>Understood:</strong> {classificationResult.type || classificationResult.intent}
                </Typography>
              </Alert>
            )}

            {/* Error messages */}
            {(error || (classificationResult && classificationResult.error)) && (
              <Alert severity="error" sx={{ mt: 2 }} role="alert">
                {error || classificationResult.message}
              </Alert>
            )}

            {/* Examples */}
            {!transcript && !isListening && (
              <Box sx={{ mt: 3, textAlign: 'left' }}>
                <Typography variant="caption" color="text.secondary" gutterBottom display="block">
                  Example commands:
                </Typography>
                <Typography variant="caption" color="text.secondary" component="div">
                  • "Fed baby 120 ml"
                  <br />
                  • "Nursed on left breast for 15 minutes"
                  <br />
                  • "Changed wet diaper"
                  <br />
                  • "Baby napped for 45 minutes"
                </Typography>
              </Box>
            )}
          </Box>
        </DialogContent>

        <DialogActions>
          <Button onClick={handleClose}>Cancel</Button>
        </DialogActions>
      </Dialog>

      {/* Review Dialog */}
      {showReview && classificationResult && (
        <VoiceActivityReview
          open={showReview}
          transcript={transcript}
          classification={classificationResult}
          onApprove={handleApprove}
          onEdit={handleEdit}
          onReject={handleReject}
          onClose={() => setShowReview(false)}
        />
      )}

      {/* Unknown Intent Dialog */}
      <Dialog
        open={showUnknownDialog}
        onClose={() => setShowUnknownDialog(false)}
        maxWidth="sm"
        fullWidth
        aria-labelledby="unknown-command-dialog-title"
        aria-describedby="unknown-command-dialog-description"
      >
        <DialogTitle id="unknown-command-dialog-title">Could Not Understand Command</DialogTitle>
        <DialogContent>
          <Box sx={{ mb: 3 }} id="unknown-command-dialog-description">
            <Typography variant="body2" color="text.secondary" gutterBottom>
              You said: "{transcript}"
            </Typography>
            <Typography variant="body2" sx={{ mt: 2 }}>
              I couldn't identify a specific activity from your command. You can either try again or manually add an activity.
            </Typography>
          </Box>

          <FormControl fullWidth sx={{ mt: 2 }}>
            <InputLabel id="activity-type-label">Activity Type</InputLabel>
            <Select
              value={manualTrackingType}
              onChange={(e) => setManualTrackingType(e.target.value)}
              label="Activity Type"
              labelId="activity-type-label"
              inputProps={{
                'aria-label': 'Select activity type for manual tracking',
              }}
            >
              <MenuItem value="feeding">Feeding</MenuItem>
              <MenuItem value="sleep">Sleep</MenuItem>
              <MenuItem value="diaper">Diaper Change</MenuItem>
              <MenuItem value="medicine">Medicine</MenuItem>
              <MenuItem value="activity">Activity</MenuItem>
            </Select>
          </FormControl>
        </DialogContent>

        <DialogActions>
          <Button onClick={handleRetry} startIcon={<MicIcon />} color="primary">
            Retry Voice Command
          </Button>
          <Button onClick={handleManualTracking} startIcon={<AddIcon />} variant="contained">
            Add Manual Tracking
          </Button>
        </DialogActions>
      </Dialog>

      {/* Snackbar for feedback */}
      <Snackbar
        open={snackbar.open}
        autoHideDuration={3000}
        onClose={handleCloseSnackbar}
        anchorOrigin={{ vertical: 'bottom', horizontal: 'center' }}
      >
        <Alert onClose={handleCloseSnackbar} severity={snackbar.severity} sx={{ width: '100%' }}>
          {snackbar.message}
        </Alert>
      </Snackbar>
    </>
  );
}