import React from 'react';
import { StyleSheet, View, ActivityIndicator, Text } from 'react-native';
import { COLORS, SPACING } from '@/constants/theme';

interface LoadingOverlayProps {
  visible: boolean;
}

export function LoadingOverlay({ visible }: LoadingOverlayProps) {
  if (!visible) return null;

  return (
    <View style={styles.overlay}>
      <ActivityIndicator size="large" color={COLORS.primary} />
    </View>
  );
}

interface EmptyStateProps {
  title: string;
  message?: string;
}

export function EmptyState({ title, message }: EmptyStateProps) {
  return (
    <View style={styles.emptyContainer}>
      <View style={styles.emptyContent}>
        <View style={styles.emptyIcon}>
            <Text style={styles.emptyIconText}>📭</Text>
          </View>
        <View style={styles.emptyText}>
          <Text style={styles.emptyTitle}>{title}</Text>
          {message && <Text style={styles.emptyMessage}>{message}</Text>}
        </View>
      </View>
    </View>
  );
}

const styles = StyleSheet.create({
  overlay: {
    ...StyleSheet.absoluteFillObject,
    backgroundColor: 'rgba(0, 0, 0, 0.3)',
    justifyContent: 'center',
    alignItems: 'center',
    zIndex: 999,
    elevation: 999,
  },
  emptyContainer: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    padding: SPACING.xl,
  },
  emptyContent: {
    alignItems: 'center',
  },
  emptyIcon: {
    width: 48,
    height: 48,
    borderRadius: 24,
    backgroundColor: COLORS.card,
    marginBottom: SPACING.md,
    justifyContent: 'center',
    alignItems: 'center',
  },
  emptyIconText: {
    fontSize: 24,
  },
  emptyText: {
    alignItems: 'center',
  },
  emptyTitle: {
    color: COLORS.textSecondary,
    fontSize: 16,
    fontWeight: '600',
  },
  emptyMessage: {
    color: COLORS.textMuted,
    fontSize: 14,
  },
});
