import React from 'react';
import {
  Alert,
  ScrollView,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from 'react-native';
import { useColorScheme } from '../../hooks/use-color-scheme';
import { useAuth } from '../../src/context/AuthContext';
import { useRouter } from 'expo-router';
import Constants from 'expo-constants';

export default function SettingsScreen() {
  const { user, serverAddress, logout } = useAuth();
  const router = useRouter();
  const colorScheme = useColorScheme() ?? 'light';
  const isDark = colorScheme === 'dark';
  const bgColor = isDark ? '#0b0b0d' : '#f5f5f5';
  const sectionBg = isDark ? '#1c1c1e' : '#fff';
  const sectionTitleBg = isDark ? '#111111' : '#f9f9f9';
  const textColor = isDark ? '#fff' : '#333';
  const subTextColor = isDark ? '#c6c6c8' : '#666';
  const primary = isDark ? '#0A84FF' : '#007AFF';
  const destructiveColor = '#f44336';

  const handleLogout = () => {
    Alert.alert('Logout', 'Are you sure you want to logout?', [
      { text: 'Cancel', style: 'cancel' },
      {
        text: 'Logout',
        style: 'destructive',
        onPress: async () => {
          await logout();
          router.replace('/login');
        },
      },
    ]);
  };

  const SettingItem = ({
    label,
    value,
    onPress,
  }: {
    label: string;
    value?: string;
    onPress?: () => void;
  }) => (
    <TouchableOpacity
      style={[
        styles.settingItem,
        { borderBottomColor: isDark ? 'rgba(255,255,255,0.03)' : '#f0f0f0' },
      ]}
      onPress={onPress}
      disabled={!onPress}
      activeOpacity={onPress ? 0.7 : 1}
    >
      <Text style={[styles.settingLabel, { color: textColor }]}>{label}</Text>
      <View style={styles.settingValueContainer}>
        <Text
          style={[styles.settingValue, { color: subTextColor }]}
          numberOfLines={1}
        >
          {value}
        </Text>
      </View>
    </TouchableOpacity>
  );

  const ActionButton = ({
    title,
    onPress,
    destructive = false,
  }: {
    title: string;
    onPress: () => void;
    destructive?: boolean;
  }) => (
    <TouchableOpacity
      style={[
        styles.actionButton,
        { backgroundColor: destructive ? destructiveColor : primary },
      ]}
      onPress={onPress}
    >
      <Text style={styles.actionButtonText}>{title}</Text>
    </TouchableOpacity>
  );

  return (
    <ScrollView style={[styles.container, { backgroundColor: bgColor }]}>
      <View style={styles.content}>
        <View
          style={[
            styles.section,
            {
              backgroundColor: sectionBg,
              shadowColor: isDark ? 'rgba(255,255,255,0.02)' : '#000',
            },
          ]}
        >
          <Text
            style={[
              styles.sectionTitle,
              { color: subTextColor, backgroundColor: sectionTitleBg },
            ]}
          >
            Information
          </Text>
          <SettingItem label="Username" value={user?.username || 'Admin'} />
          <SettingItem label="Email" value={user?.email || 'N/A'} />
          <SettingItem label="Server URL" value={serverAddress || 'N/A'} />
          <SettingItem label="App Version" value={`${Constants.expoConfig?.version}`} />
        </View>

        <View
          style={[
            styles.section,
            {
              backgroundColor: sectionBg,
              shadowColor: isDark ? 'rgba(255,255,255,0.02)' : '#000',
            },
          ]}
        >
          <Text
            style={[
              styles.sectionTitle,
              { color: subTextColor, backgroundColor: sectionTitleBg },
            ]}
          >
            Actions
          </Text>
          <ActionButton title="Logout" onPress={handleLogout} destructive />
        </View>

        <View style={styles.footer}>
          <Text style={[styles.footerText, { color: subTextColor }]}>
            UpSnap Mobile App
          </Text>
          <Text style={[styles.footerText, { color: subTextColor }]}>
            Connect to your UpSnap server
          </Text>
        </View>
      </View>
    </ScrollView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#f5f5f5',
  },
  content: {
    padding: 20,
  },
  section: {
    backgroundColor: '#fff',
    borderRadius: 12,
    marginBottom: 20,
    overflow: 'hidden',
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 2 },
    shadowOpacity: 0.1,
    shadowRadius: 4,
    elevation: 3,
  },
  sectionTitle: {
    fontSize: 14,
    fontWeight: 'bold',
    color: '#666',
    paddingHorizontal: 15,
    paddingTop: 15,
    paddingBottom: 10,
    backgroundColor: '#f9f9f9',
    borderTopLeftRadius: 12,
    borderTopRightRadius: 12,
  },
  settingItem: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    paddingHorizontal: 15,
    paddingVertical: 15,
    borderBottomWidth: 1,
    borderBottomColor: '#f0f0f0',
  },
  settingLabel: {
    fontSize: 16,
    color: '#333',
    flex: 1,
  },
  settingValueContainer: {
    flex: 1,
    alignItems: 'flex-end',
  },
  settingValue: {
    fontSize: 14,
    color: '#666',
    maxWidth: 200,
  },
  actionButton: {
    backgroundColor: '#007AFF',
    margin: 15,
    padding: 15,
    borderRadius: 8,
    alignItems: 'center',
  },
  actionButtonDestructive: {
    backgroundColor: '#f44336',
  },
  actionButtonText: {
    color: '#fff',
    fontSize: 16,
    fontWeight: 'bold',
  },
  actionButtonTextDestructive: {
    color: '#fff',
  },
  footer: {
    alignItems: 'center',
    paddingVertical: 30,
  },
  footerText: {
    fontSize: 14,
    color: '#999',
    marginBottom: 5,
  },
});