'use client';

import { useState, useEffect, useCallback } from 'react';
import { Box, Typography, Button, Paper, CircularProgress, Grid } from '@mui/material';
import { AppShell } from '@/components/layouts/AppShell/AppShell';
import { ProtectedRoute } from '@/components/common/ProtectedRoute';
import { EmailVerificationBanner } from '@/components/common/EmailVerificationBanner';
import { ErrorBoundary } from '@/components/common/ErrorBoundary';
import { DataErrorFallback } from '@/components/common/ErrorFallbacks';
import { NetworkStatusIndicator } from '@/components/common/NetworkStatusIndicator';
import { StatGridSkeleton } from '@/components/common/LoadingSkeletons';
import {
  Restaurant,
  Hotel,
  BabyChangingStation,
  Insights,
  SmartToy,
  Analytics,
  MedicalServices,
} from '@mui/icons-material';
import { motion } from 'framer-motion';
import { useAuth } from '@/lib/auth/AuthContext';
import { useRouter } from 'next/navigation';
import { useQuery } from '@apollo/client/react';
import { GET_DASHBOARD } from '@/graphql/queries/dashboard';
import { format } from 'date-fns';
import { useRealTimeActivities } from '@/hooks/useWebSocket';
import { useTranslation } from '@/hooks/useTranslation';

export default function HomePage() {
  const { t } = useTranslation('dashboard');
  const { user, isLoading: authLoading } = useAuth();
  const router = useRouter();
  const [selectedChildId, setSelectedChildId] = useState<string | null>(null);

  // GraphQL query for dashboard data
  const { data, loading, error, refetch } = useQuery(GET_DASHBOARD, {
    variables: { childId: selectedChildId },
    skip: authLoading || !user,
    fetchPolicy: 'cache-and-network',
  });

  // Log GraphQL errors and data for debugging
  useEffect(() => {
    console.log('[HomePage] === GraphQL Debug Info ===');
    console.log('[HomePage] Raw data:', data);
    console.log('[HomePage] Data type:', typeof data);
    console.log('[HomePage] Data keys:', data ? Object.keys(data) : 'null');

    if (error) {
      console.error('[HomePage] GraphQL error:', error);
      console.error('[HomePage] GraphQL error details:', {
        message: error.message,
        networkError: error.networkError,
        graphQLErrors: error.graphQLErrors,
      });
    }
    if (data) {
      console.log('[HomePage] GraphQL data:', data);
      console.log('[HomePage] Dashboard data:', data.dashboard);
    }
    console.log('[HomePage] Query state:', {
      loading,
      error: !!error,
      hasData: !!data,
      user: !!user,
      skip: authLoading || !user,
      childrenCount: data?.dashboard?.children?.length || 0,
      selectedChildId,
    });
    console.log('[HomePage] LocalStorage token:', typeof window !== 'undefined' ? localStorage.getItem('accessToken')?.substring(0, 20) : 'SSR');
  }, [error, data, loading, user, authLoading, selectedChildId]);

  // Real-time activity handler to refetch dashboard data
  const refreshDashboard = useCallback(async () => {
    if (refetch) {
      console.log('[HomePage] Refreshing dashboard data...');
      await refetch();
    }
  }, [refetch]);

  // Subscribe to real-time activity updates
  useRealTimeActivities(
    refreshDashboard, // On activity created
    refreshDashboard, // On activity updated
    refreshDashboard  // On activity deleted
  );

  // Set the first child as selected when data loads
  useEffect(() => {
    if (data?.dashboard?.children && data.dashboard.children.length > 0 && !selectedChildId) {
      const firstChild = data.dashboard.children[0];
      setSelectedChildId(firstChild.id);
    }
  }, [data, selectedChildId]);

  const quickActions = [
    { icon: <Restaurant />, label: t('quickActions.feeding'), color: '#E91E63', path: '/track/feeding' }, // Pink with 4.5:1 contrast
    { icon: <Hotel />, label: t('quickActions.sleep'), color: '#1976D2', path: '/track/sleep' }, // Blue with 4.5:1 contrast
    { icon: <BabyChangingStation />, label: t('quickActions.diaper'), color: '#F57C00', path: '/track/diaper' }, // Orange with 4.5:1 contrast
    { icon: <MedicalServices />, label: t('quickActions.medicine'), color: '#C62828', path: '/track/medication' }, // Red with 4.5:1 contrast
    { icon: <Insights />, label: t('quickActions.activities'), color: '#558B2F', path: '/activities' }, // Green with 4.5:1 contrast
    { icon: <SmartToy />, label: t('quickActions.aiAssistant'), color: '#D84315', path: '/ai-assistant' }, // Deep orange with 4.5:1 contrast
  ];

  const formatSleepHours = (minutes: number) => {
    const hours = Math.floor(minutes / 60);
    const mins = minutes % 60;
    if (hours > 0 && mins > 0) {
      return `${hours}h ${mins}m`;
    } else if (hours > 0) {
      return `${hours}h`;
    } else {
      return `${mins}m`;
    }
  };

  // Extract data from GraphQL response
  const children = data?.dashboard?.children || [];
  const selectedChild = data?.dashboard?.selectedChild;
  const dailySummary = data?.dashboard?.todaySummary;
  const isLoading = authLoading || loading;

  return (
    <ProtectedRoute>
      <AppShell>
        <NetworkStatusIndicator />
        <Box>
          <EmailVerificationBanner />

          <motion.div
            initial={{ opacity: 0, y: 20 }}
            animate={{ opacity: 1, y: 0 }}
            transition={{ duration: 0.5 }}
          >
            <Typography variant="h4" component="h1" gutterBottom fontWeight="600" sx={{ mb: 1 }}>
              {user?.name ? t('welcomeBackWithName', { name: user.name }) : t('welcomeBack')} 👋
            </Typography>
          <Typography variant="body1" sx={{ mb: 4, color: 'text.primary' }}>
            {t('subtitle')}
          </Typography>

          {/* Quick Actions */}
          <Typography variant="h6" component="h2" gutterBottom fontWeight="600" sx={{ mb: 2 }}>
            {t('quickActions.title')}
          </Typography>
          <Grid container spacing={2} sx={{ mb: 4 }}>
            {quickActions.map((action, index) => (
              <Grid size={{ xs: 6, sm: 4, md: 2 }} key={action.label}>
                <motion.div
                  initial={{ opacity: 0, scale: 0.9 }}
                  animate={{ opacity: 1, scale: 1 }}
                  transition={{ duration: 0.3, delay: index * 0.1 }}
                  style={{ height: '100%' }}
                >
                  <Paper
                    component="button"
                    onClick={() => router.push(action.path)}
                    onKeyDown={(e) => {
                      if (e.key === 'Enter' || e.key === ' ') {
                        e.preventDefault();
                        router.push(action.path);
                      }
                    }}
                    aria-label={t('quickActions.navigateTo', { action: action.label })}
                    sx={{
                      p: 3,
                      height: '100%',
                      display: 'flex',
                      flexDirection: 'column',
                      alignItems: 'center',
                      justifyContent: 'center',
                      textAlign: 'center',
                      cursor: 'pointer',
                      bgcolor: action.color,
                      color: 'white',
                      border: 'none',
                      transition: 'transform 0.2s',
                      '&:hover': {
                        transform: 'scale(1.05)',
                      },
                      '&:focus-visible': {
                        outline: '3px solid white',
                        outlineOffset: '-3px',
                        transform: 'scale(1.05)',
                      },
                    }}
                  >
                    <Box sx={{ fontSize: 48, mb: 1 }} aria-hidden="true">{action.icon}</Box>
                    <Typography variant="body1" fontWeight="600">
                      {action.label}
                    </Typography>
                  </Paper>
                </motion.div>
              </Grid>
            ))}
          </Grid>

          {/* Today's Summary */}
          <Typography variant="h6" component="h2" gutterBottom fontWeight="600" sx={{ mb: 2 }}>
            {selectedChild ? t('summary.titleWithChild', { childName: selectedChild.name }) : t('summary.title')}
          </Typography>
          <ErrorBoundary
            isolate
            fallback={<DataErrorFallback error={new Error('Failed to load summary')} />}
          >
            {isLoading ? (
              <StatGridSkeleton count={3} />
            ) : (
              <Paper sx={{ p: 3 }}>
                {!dailySummary ? (
                <Box sx={{ textAlign: 'center', py: 4 }}>
                  <Typography variant="body2" sx={{ color: 'rgba(0, 0, 0, 0.7)' }}>
                    {children.length === 0
                      ? t('summary.noChild')
                      : t('summary.noActivities')}
                  </Typography>
                </Box>
              ) : (
                <Grid container spacing={3}>
                  <Grid size={{ xs: 6, sm: 3 }}>
                    <Box
                      textAlign="center"
                      sx={{
                        display: 'flex',
                        flexDirection: 'column',
                        alignItems: 'center',
                        height: '100%',
                        minHeight: '120px'
                      }}
                    >
                      <Restaurant sx={{ fontSize: 32, color: 'primary.main', mb: 1 }} aria-hidden="true" />
                      <Typography variant="h3" component="div" fontWeight="600" aria-label={`${dailySummary.feedingCount || 0} feedings today`}>
                        {dailySummary.feedingCount || 0}
                      </Typography>
                      <Typography variant="body2" sx={{ color: 'rgba(0, 0, 0, 0.7)' }}>
                        {t('summary.feedings')}
                      </Typography>
                    </Box>
                  </Grid>
                  <Grid size={{ xs: 6, sm: 3 }}>
                    <Box
                      textAlign="center"
                      sx={{
                        display: 'flex',
                        flexDirection: 'column',
                        alignItems: 'center',
                        height: '100%',
                        minHeight: '120px'
                      }}
                    >
                      <Hotel sx={{ fontSize: 32, color: 'info.main', mb: 1 }} aria-hidden="true" />
                      <Typography variant="h3" component="div" fontWeight="600" aria-label={`${dailySummary.totalSleepDuration ? formatSleepHours(dailySummary.totalSleepDuration) : '0 minutes'} sleep today`}>
                        {dailySummary.totalSleepDuration
                          ? formatSleepHours(dailySummary.totalSleepDuration)
                          : '0m'}
                      </Typography>
                      <Typography variant="body2" sx={{ color: 'rgba(0, 0, 0, 0.7)' }}>
                        {t('summary.sleep')}
                      </Typography>
                    </Box>
                  </Grid>
                  <Grid size={{ xs: 6, sm: 3 }}>
                    <Box
                      textAlign="center"
                      sx={{
                        display: 'flex',
                        flexDirection: 'column',
                        alignItems: 'center',
                        height: '100%',
                        minHeight: '120px'
                      }}
                    >
                      <BabyChangingStation sx={{ fontSize: 32, color: 'warning.main', mb: 1 }} aria-hidden="true" />
                      <Typography variant="h3" component="div" fontWeight="600" aria-label={`${dailySummary.diaperCount || 0} diaper changes today`}>
                        {dailySummary.diaperCount || 0}
                      </Typography>
                      <Typography variant="body2" sx={{ color: 'rgba(0, 0, 0, 0.7)' }}>
                        {t('summary.diapers')}
                      </Typography>
                    </Box>
                  </Grid>
                  <Grid size={{ xs: 6, sm: 3 }}>
                    <Box
                      textAlign="center"
                      sx={{
                        display: 'flex',
                        flexDirection: 'column',
                        alignItems: 'center',
                        height: '100%',
                        minHeight: '120px'
                      }}
                    >
                      <MedicalServices sx={{ fontSize: 32, color: 'error.main', mb: 1 }} aria-hidden="true" />
                      <Typography variant="h3" component="div" fontWeight="600" aria-label={`${dailySummary.medicationCount || 0} medications today`}>
                        {dailySummary.medicationCount || 0}
                      </Typography>
                      <Typography variant="body2" sx={{ color: 'rgba(0, 0, 0, 0.7)' }}>
                        {t('summary.medications')}
                      </Typography>
                    </Box>
                  </Grid>
                </Grid>
                )}
              </Paper>
            )}
          </ErrorBoundary>

          {/* Next Predicted Activity */}
          <Box sx={{ mt: 4 }}>
            <Paper sx={{ p: 3, bgcolor: 'primary.light' }}>
              <Typography variant="body2" sx={{ color: 'rgba(0, 0, 0, 0.7)' }} gutterBottom>
                {t('predictions.title')}
              </Typography>
              <Typography variant="h6" fontWeight="600" gutterBottom>
                {t('predictions.napTime', { minutes: 45 })}
              </Typography>
              <Typography variant="body2" sx={{ color: 'rgba(0, 0, 0, 0.7)' }}>
                {t('predictions.basedOnPatterns')}
              </Typography>
            </Paper>
          </Box>
          </motion.div>
        </Box>
      </AppShell>
    </ProtectedRoute>
  );
}