import React from 'react';
import { StyleSheet, View } from 'react-native';
import { useTheme, Text, Button, IconButton, Surface } from 'react-native-paper';

export interface ErrorStateProps {
  /** Error message to display */
  message?: string;
  /** Callback invoked when the retry button is pressed */
  onRetry?: () => void;
}

/**
 * Reusable error state with a warning icon, message, and optional
 * retry button.  Useful for fetch-failure fallbacks throughout the app.
 */
export function ErrorState({ message, onRetry }: ErrorStateProps) {
  const theme = useTheme();

  return (
    <Surface
      style={[styles.container, { backgroundColor: theme.colors.surface }]}
      elevation={0}
    >
      <View style={styles.content}>
        <IconButton
          icon="alert-circle-outline"
          size={56}
          iconColor={theme.colors.error}
          style={styles.icon}
          disabled
        />
        <Text
          variant="titleMedium"
          style={[styles.title, { color: theme.colors.error }]}
        >
          Something went wrong
        </Text>
        {message ? (
          <Text
            variant="bodyMedium"
            style={[styles.message, { color: theme.colors.onSurfaceVariant }]}
          >
            {message}
          </Text>
        ) : null}
        {onRetry ? (
          <Button
            mode="contained"
            onPress={onRetry}
            style={styles.retryButton}
            icon="refresh"
          >
            Try Again
          </Button>
        ) : null}
      </View>
    </Surface>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    borderRadius: 12,
  },
  content: {
    alignItems: 'center',
    justifyContent: 'center',
    padding: 24,
    gap: 8,
  },
  icon: {
    margin: 0,
  },
  title: {
    textAlign: 'center',
  },
  message: {
    textAlign: 'center',
    maxWidth: 280,
  },
  retryButton: {
    marginTop: 8,
  },
});