import React from 'react';
import { View, Text, StyleSheet, TouchableOpacity } from 'react-native';
import { Ionicons } from '@expo/vector-icons';
import { router } from 'expo-router';
import { AppColors, FontSizes, Spacing } from '@/constants/theme';

interface PageHeaderProps {
  title: string;
  onBack?: () => void;
  rightElement?: React.ReactNode;
}

export function PageHeader({ title, onBack, rightElement }: PageHeaderProps) {
  const handleBack = () => {
    if (onBack) {
      onBack();
    } else {
      router.back();
    }
  };

  return (
    <View style={styles.header}>
      <TouchableOpacity style={styles.backButton} onPress={handleBack}>
        <Ionicons name="chevron-back" size={28} color={AppColors.primary} />
      </TouchableOpacity>
      <Text style={styles.title}>{title}</Text>
      <View style={styles.rightContainer}>
        {rightElement || <View style={styles.placeholder} />}
      </View>
    </View>
  );
}

const styles = StyleSheet.create({
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: Spacing.sm,
    paddingVertical: Spacing.md,
    backgroundColor: AppColors.background,
    borderBottomWidth: 1,
    borderBottomColor: AppColors.border,
  },
  backButton: {
    width: 44,
    height: 44,
    justifyContent: 'center',
    alignItems: 'center',
  },
  title: {
    flex: 1,
    fontSize: FontSizes.lg,
    fontWeight: '600',
    color: AppColors.textPrimary,
    textAlign: 'center',
  },
  rightContainer: {
    width: 44,
    alignItems: 'flex-end',
  },
  placeholder: {
    width: 44,
  },
});