import React, { useState, useEffect } from 'react';
import {
  View,
  Text,
  StyleSheet,
  ScrollView,
  RefreshControl,
} from 'react-native';
import { Ionicons } from '@expo/vector-icons';
import { AppColors, Spacing, BorderRadius, FontSizes, FontWeights } from '@/constants/theme';

interface MockDashboardProps {
  beneficiaryName: string;
}

// Mock data generator - creates realistic-looking data
const generateMockData = () => {
  const now = new Date();
  const hours = now.getHours();

  // Generate activities based on time of day
  const activities = [
    {
      id: 1,
      type: 'walking',
      icon: 'walk' as const,
      title: 'Movement',
      value: `${Math.floor(Math.random() * 2000 + 500)} steps`,
      time: `${Math.floor(Math.random() * 30 + 10)} min ago`,
      color: AppColors.success,
    },
    {
      id: 2,
      type: 'hydration',
      icon: 'water' as const,
      title: 'Hydration',
      value: `${Math.floor(Math.random() * 4 + 2)} glasses`,
      time: `${Math.floor(Math.random() * 60 + 20)} min ago`,
      color: '#3B82F6',
    },
    {
      id: 3,
      type: 'bathroom',
      icon: 'home' as const,
      title: 'Bathroom',
      value: `${Math.floor(Math.random() * 3 + 2)} visits`,
      time: `${Math.floor(Math.random() * 120 + 30)} min ago`,
      color: '#8B5CF6',
    },
    {
      id: 4,
      type: 'sleep',
      icon: 'moon' as const,
      title: 'Sleep',
      value: hours < 10 ? `${(Math.random() * 2 + 6).toFixed(1)} hrs` : 'N/A',
      time: hours < 10 ? 'Last night' : 'Tracking tonight',
      color: '#6366F1',
    },
    {
      id: 5,
      type: 'meals',
      icon: 'restaurant' as const,
      title: 'Kitchen Activity',
      value: `${Math.floor(Math.random() * 2 + 1)} visits`,
      time: `${Math.floor(Math.random() * 180 + 60)} min ago`,
      color: '#F59E0B',
    },
  ];

  return {
    wellnessScore: Math.floor(Math.random() * 20 + 75), // 75-95
    temperature: {
      living: (Math.random() * 4 + 68).toFixed(1),
      bedroom: (Math.random() * 4 + 66).toFixed(1),
    },
    lastActivity: {
      location: ['Living Room', 'Kitchen', 'Bedroom', 'Bathroom'][Math.floor(Math.random() * 4)],
      time: `${Math.floor(Math.random() * 15 + 1)} min ago`,
    },
    activities,
    alerts: Math.random() > 0.8 ? 1 : 0, // 20% chance of alert
  };
};

export default function MockDashboard({ beneficiaryName }: MockDashboardProps) {
  const [data, setData] = useState(generateMockData());
  const [refreshing, setRefreshing] = useState(false);

  const onRefresh = () => {
    setRefreshing(true);
    setTimeout(() => {
      setData(generateMockData());
      setRefreshing(false);
    }, 1000);
  };

  // Refresh data every 5 minutes
  useEffect(() => {
    const interval = setInterval(() => {
      setData(generateMockData());
    }, 5 * 60 * 1000);
    return () => clearInterval(interval);
  }, []);

  const getWellnessColor = (score: number) => {
    if (score >= 80) return AppColors.success;
    if (score >= 60) return AppColors.warning;
    return AppColors.danger;
  };

  return (
    <ScrollView
      style={styles.container}
      contentContainerStyle={styles.content}
      refreshControl={
        <RefreshControl refreshing={refreshing} onRefresh={onRefresh} />
      }
    >
      {/* Mock Data Banner */}
      <View style={styles.mockBanner}>
        <Ionicons name="flask" size={16} color={AppColors.warning} />
        <Text style={styles.mockBannerText}>
          Demo Data - Connect sensors for real activity
        </Text>
      </View>

      {/* Wellness Score Card */}
      <View style={styles.card}>
        <View style={styles.cardHeader}>
          <Text style={styles.cardTitle}>Wellness Score</Text>
          <View style={[styles.badge, { backgroundColor: getWellnessColor(data.wellnessScore) + '20' }]}>
            <Text style={[styles.badgeText, { color: getWellnessColor(data.wellnessScore) }]}>
              {data.wellnessScore >= 80 ? 'Good' : data.wellnessScore >= 60 ? 'Fair' : 'Low'}
            </Text>
          </View>
        </View>
        <View style={styles.scoreContainer}>
          <Text style={[styles.scoreValue, { color: getWellnessColor(data.wellnessScore) }]}>
            {data.wellnessScore}%
          </Text>
          <View style={styles.scoreBar}>
            <View
              style={[
                styles.scoreProgress,
                {
                  width: `${data.wellnessScore}%`,
                  backgroundColor: getWellnessColor(data.wellnessScore)
                }
              ]}
            />
          </View>
        </View>
      </View>

      {/* Current Status */}
      <View style={styles.card}>
        <Text style={styles.cardTitle}>Current Status</Text>
        <View style={styles.statusRow}>
          <View style={styles.statusItem}>
            <Ionicons name="location" size={24} color={AppColors.primary} />
            <View style={styles.statusTextContainer}>
              <Text style={styles.statusLabel}>Location</Text>
              <Text style={styles.statusValue}>{data.lastActivity.location}</Text>
            </View>
          </View>
          <View style={styles.statusItem}>
            <Ionicons name="time" size={24} color={AppColors.primary} />
            <View style={styles.statusTextContainer}>
              <Text style={styles.statusLabel}>Last Activity</Text>
              <Text style={styles.statusValue}>{data.lastActivity.time}</Text>
            </View>
          </View>
        </View>
      </View>

      {/* Temperature */}
      <View style={styles.card}>
        <Text style={styles.cardTitle}>Home Temperature</Text>
        <View style={styles.tempRow}>
          <View style={styles.tempItem}>
            <Ionicons name="sunny" size={28} color="#F59E0B" />
            <Text style={styles.tempValue}>{data.temperature.living}°F</Text>
            <Text style={styles.tempLabel}>Living Room</Text>
          </View>
          <View style={styles.tempDivider} />
          <View style={styles.tempItem}>
            <Ionicons name="moon" size={28} color="#6366F1" />
            <Text style={styles.tempValue}>{data.temperature.bedroom}°F</Text>
            <Text style={styles.tempLabel}>Bedroom</Text>
          </View>
        </View>
      </View>

      {/* Activities */}
      <View style={styles.card}>
        <Text style={styles.cardTitle}>Today's Activities</Text>
        <View style={styles.activitiesGrid}>
          {data.activities.map((activity) => (
            <View key={activity.id} style={styles.activityCard}>
              <View style={[styles.activityIcon, { backgroundColor: activity.color + '20' }]}>
                <Ionicons name={activity.icon} size={22} color={activity.color} />
              </View>
              <Text style={styles.activityTitle}>{activity.title}</Text>
              <Text style={styles.activityValue}>{activity.value}</Text>
              <Text style={styles.activityTime}>{activity.time}</Text>
            </View>
          ))}
        </View>
      </View>

      {/* Alerts Section */}
      {data.alerts > 0 && (
        <View style={[styles.card, styles.alertCard]}>
          <View style={styles.alertHeader}>
            <Ionicons name="alert-circle" size={24} color={AppColors.warning} />
            <Text style={styles.alertTitle}>Attention Needed</Text>
          </View>
          <Text style={styles.alertText}>
            Lower than usual activity detected. Consider checking in.
          </Text>
        </View>
      )}

      {/* Info Footer */}
      <View style={styles.infoFooter}>
        <Ionicons name="information-circle" size={18} color={AppColors.textMuted} />
        <Text style={styles.infoText}>
          This is demo data. Once sensors are installed and connected,
          you'll see real activity data from your loved one's home.
        </Text>
      </View>
    </ScrollView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: AppColors.background,
  },
  content: {
    padding: Spacing.md,
    paddingBottom: Spacing.xxl,
  },
  mockBanner: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: `${AppColors.warning}15`,
    paddingVertical: Spacing.sm,
    paddingHorizontal: Spacing.md,
    borderRadius: BorderRadius.md,
    marginBottom: Spacing.md,
    gap: Spacing.xs,
  },
  mockBannerText: {
    fontSize: FontSizes.sm,
    color: AppColors.warning,
    fontWeight: FontWeights.medium,
  },
  card: {
    backgroundColor: AppColors.surface,
    borderRadius: BorderRadius.lg,
    padding: Spacing.lg,
    marginBottom: Spacing.md,
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 1 },
    shadowOpacity: 0.05,
    shadowRadius: 3,
    elevation: 1,
  },
  cardHeader: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    marginBottom: Spacing.md,
  },
  cardTitle: {
    fontSize: FontSizes.lg,
    fontWeight: FontWeights.semibold,
    color: AppColors.textPrimary,
    marginBottom: Spacing.sm,
  },
  badge: {
    paddingHorizontal: Spacing.sm,
    paddingVertical: Spacing.xs,
    borderRadius: BorderRadius.full,
  },
  badgeText: {
    fontSize: FontSizes.xs,
    fontWeight: FontWeights.semibold,
  },
  scoreContainer: {
    alignItems: 'center',
  },
  scoreValue: {
    fontSize: 48,
    fontWeight: FontWeights.bold,
    marginBottom: Spacing.sm,
  },
  scoreBar: {
    width: '100%',
    height: 8,
    backgroundColor: AppColors.border,
    borderRadius: BorderRadius.full,
    overflow: 'hidden',
  },
  scoreProgress: {
    height: '100%',
    borderRadius: BorderRadius.full,
  },
  statusRow: {
    flexDirection: 'row',
    justifyContent: 'space-around',
    marginTop: Spacing.sm,
  },
  statusItem: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: Spacing.sm,
  },
  statusTextContainer: {
    alignItems: 'flex-start',
  },
  statusLabel: {
    fontSize: FontSizes.xs,
    color: AppColors.textMuted,
  },
  statusValue: {
    fontSize: FontSizes.base,
    fontWeight: FontWeights.medium,
    color: AppColors.textPrimary,
  },
  tempRow: {
    flexDirection: 'row',
    justifyContent: 'space-around',
    alignItems: 'center',
    marginTop: Spacing.sm,
  },
  tempItem: {
    alignItems: 'center',
    flex: 1,
  },
  tempDivider: {
    width: 1,
    height: 50,
    backgroundColor: AppColors.border,
  },
  tempValue: {
    fontSize: FontSizes.xl,
    fontWeight: FontWeights.bold,
    color: AppColors.textPrimary,
    marginTop: Spacing.xs,
  },
  tempLabel: {
    fontSize: FontSizes.xs,
    color: AppColors.textMuted,
    marginTop: Spacing.xs,
  },
  activitiesGrid: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    gap: Spacing.sm,
    marginTop: Spacing.sm,
  },
  activityCard: {
    width: '48%',
    backgroundColor: AppColors.background,
    borderRadius: BorderRadius.md,
    padding: Spacing.md,
    alignItems: 'center',
  },
  activityIcon: {
    width: 44,
    height: 44,
    borderRadius: BorderRadius.full,
    justifyContent: 'center',
    alignItems: 'center',
    marginBottom: Spacing.xs,
  },
  activityTitle: {
    fontSize: FontSizes.sm,
    fontWeight: FontWeights.medium,
    color: AppColors.textPrimary,
    marginBottom: Spacing.xs,
  },
  activityValue: {
    fontSize: FontSizes.lg,
    fontWeight: FontWeights.bold,
    color: AppColors.textPrimary,
  },
  activityTime: {
    fontSize: FontSizes.xs,
    color: AppColors.textMuted,
    marginTop: Spacing.xs,
  },
  alertCard: {
    backgroundColor: `${AppColors.warning}10`,
    borderWidth: 1,
    borderColor: `${AppColors.warning}30`,
  },
  alertHeader: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: Spacing.sm,
    marginBottom: Spacing.sm,
  },
  alertTitle: {
    fontSize: FontSizes.base,
    fontWeight: FontWeights.semibold,
    color: AppColors.warning,
  },
  alertText: {
    fontSize: FontSizes.sm,
    color: AppColors.textSecondary,
    lineHeight: 20,
  },
  infoFooter: {
    flexDirection: 'row',
    alignItems: 'flex-start',
    gap: Spacing.sm,
    marginTop: Spacing.md,
    paddingHorizontal: Spacing.sm,
  },
  infoText: {
    flex: 1,
    fontSize: FontSizes.xs,
    color: AppColors.textMuted,
    lineHeight: 18,
  },
});