/**
 * 完整示例页面
 * 展示所有工具的使用方法
 */

import React, { useState, useEffect } from 'react';
import {
  StyleSheet,
  View,
  Text,
  TextInput,
  TouchableOpacity,
  ScrollView,
  Switch,
  Alert,
  ActivityIndicator,
} from 'react-native';
import { useForm, Controller } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { Image } from 'expo-image';

// 导入所有工具
import {
  // 工具函数
  Storage,
  STORAGE_KEYS,
  formatDate,
  formatRelativeTime,
  formatChatTime,
  
  // 状态管理
  useUserStore,
  useUser,
  useIsLoggedIn,
  useSettingsStore,
  useTheme,
  useLanguage,
  useHapticsEnabled,
  
  // 验证规则
  loginSchema,
  type LoginFormData,
  
  // API 服务
  authService,
  
  // 自定义 Hooks
  useDebounce,
  useThrottle,
  useHaptics,
} from '@/src';

export default function DemoScreen() {
  const haptics = useHaptics();
  
  // 状态管理示例
  const user = useUser();
  const isLoggedIn = useIsLoggedIn();
  const login = useUserStore((state) => state.login);
  const logout = useUserStore((state) => state.logout);
  
  // 设置状态
  const theme = useTheme();
  const language = useLanguage();
  const hapticsEnabled = useHapticsEnabled();
  const setTheme = useSettingsStore((state) => state.setTheme);
  const setLanguage = useSettingsStore((state) => state.setLanguage);
  const setHapticsEnabled = useSettingsStore((state) => state.setHapticsEnabled);
  
  // 本地状态
  const [searchText, setSearchText] = useState('');
  const [searchResults, setSearchResults] = useState<string[]>([]);
  const [loading, setLoading] = useState(false);
  const [counter, setCounter] = useState(0);
  const [storageValue, setStorageValue] = useState('');

  // 表单配置
  const {
    control,
    handleSubmit,
    formState: { errors },
  } = useForm<LoginFormData>({
    resolver: zodResolver(loginSchema),
    defaultValues: {
      email: '',
      password: '',
    },
  });

  // 防抖搜索示例
  const debouncedSearch = useDebounce(async (text: string) => {
    if (!text.trim()) {
      setSearchResults([]);
      return;
    }

    console.log('执行搜索:', text);
    // 模拟 API 调用
    await new Promise((resolve) => setTimeout(resolve, 500));
    setSearchResults([
      `结果 1: ${text}`,
      `结果 2: ${text}`,
      `结果 3: ${text}`,
    ]);
  }, 500);

  // 监听搜索文本变化
  useEffect(() => {
    debouncedSearch(searchText);
  }, [searchText]);

  // 节流点击示例
  const throttledClick = useThrottle(() => {
    haptics.light();
    setCounter((prev) => prev + 1);
    console.log('节流点击:', counter + 1);
  }, 1000);

  // 登录处理
  const onLogin = async (data: LoginFormData) => {
    try {
      setLoading(true);
      haptics.light();

      // 模拟登录 API 调用
      console.log('登录数据:', data);
      
      // 实际项目中使用：
      // const { user, token } = await authService.login(data);
      // login(user, token);
      
      // 模拟登录成功
      const mockUser = {
        id: '1',
        username: data.email.split('@')[0],
        email: data.email,
        avatar: 'https://i.pravatar.cc/150?img=1',
        nickname: '演示用户',
        createdAt: new Date().toISOString(),
      };
      
      login(mockUser, 'mock-token-123456');
      haptics.success();
      Alert.alert('成功', '登录成功！');
    } catch (error: any) {
      haptics.error();
      Alert.alert('失败', error.message || '登录失败');
    } finally {
      setLoading(false);
    }
  };

  // 登出处理
  const handleLogout = () => {
    haptics.warning();
    Alert.alert(
      '确认',
      '确定要退出登录吗？',
      [
        { text: '取消', style: 'cancel' },
        {
          text: '确定',
          onPress: () => {
            logout();
            haptics.success();
          },
        },
      ]
    );
  };

  // 存储示例
  const handleSaveToStorage = async () => {
    try {
      haptics.light();
      const testData = {
        message: 'Hello from AsyncStorage!',
        timestamp: new Date().toISOString(),
        counter,
      };
      
      await Storage.setObject(STORAGE_KEYS.USER_PREFERENCES, testData);
      haptics.success();
      Alert.alert('成功', '数据已保存到本地存储');
    } catch (error) {
      haptics.error();
      Alert.alert('失败', '保存失败');
    }
  };

  const handleLoadFromStorage = async () => {
    try {
      haptics.light();
      const data = await Storage.getObject<any>(STORAGE_KEYS.USER_PREFERENCES);
      
      if (data) {
        setStorageValue(JSON.stringify(data, null, 2));
        haptics.success();
      } else {
        setStorageValue('暂无数据');
        haptics.warning();
      }
    } catch (error) {
      haptics.error();
      Alert.alert('失败', '读取失败');
    }
  };

  // 主题切换
  const handleThemeChange = () => {
    haptics.selection();
    const themes: Array<'light' | 'dark' | 'auto'> = ['light', 'dark', 'auto'];
    const currentIndex = themes.indexOf(theme);
    const nextTheme = themes[(currentIndex + 1) % themes.length];
    setTheme(nextTheme);
  };

  // 语言切换
  const handleLanguageChange = () => {
    haptics.selection();
    setLanguage(language === 'zh-CN' ? 'en-US' : 'zh-CN');
  };

  return (
    <ScrollView style={styles.container}>
      <View style={styles.content}>
        {/* 标题 */}
        <Text style={styles.title}>🎯 完整功能演示</Text>
        <Text style={styles.subtitle}>展示所有工具的使用方法</Text>

        {/* 用户状态显示 */}
        <View style={styles.section}>
          <Text style={styles.sectionTitle}>👤 用户状态 (Zustand)</Text>
          {isLoggedIn ? (
            <View style={styles.userInfo}>
              {user?.avatar && (
                <Image
                  source={{ uri: user.avatar }}
                  style={styles.avatar}
                  contentFit="cover"
                />
              )}
              <View style={styles.userDetails}>
                <Text style={styles.userName}>{user?.nickname}</Text>
                <Text style={styles.userEmail}>{user?.email}</Text>
                <Text style={styles.userDate}>
                  注册时间: {formatRelativeTime(user?.createdAt || '')}
                </Text>
              </View>
              <TouchableOpacity
                style={[styles.button, styles.logoutButton]}
                onPress={handleLogout}
              >
                <Text style={styles.buttonText}>退出</Text>
              </TouchableOpacity>
            </View>
          ) : (
            <Text style={styles.infoText}>未登录</Text>
          )}
        </View>

        {/* 登录表单 */}
        {!isLoggedIn && (
          <View style={styles.section}>
            <Text style={styles.sectionTitle}>🔐 登录表单 (React Hook Form + Zod)</Text>
            
            <Controller
              control={control}
              name="email"
              render={({ field: { onChange, value } }) => (
                <View style={styles.inputGroup}>
                  <Text style={styles.label}>邮箱</Text>
                  <TextInput
                    value={value}
                    onChangeText={onChange}
                    placeholder="请输入邮箱"
                    keyboardType="email-address"
                    autoCapitalize="none"
                    style={[
                      styles.input,
                      errors.email && styles.inputError,
                    ]}
                  />
                  {errors.email && (
                    <Text style={styles.errorText}>{errors.email.message}</Text>
                  )}
                </View>
              )}
            />

            <Controller
              control={control}
              name="password"
              render={({ field: { onChange, value } }) => (
                <View style={styles.inputGroup}>
                  <Text style={styles.label}>密码</Text>
                  <TextInput
                    value={value}
                    onChangeText={onChange}
                    placeholder="请输入密码"
                    secureTextEntry
                    style={[
                      styles.input,
                      errors.password && styles.inputError,
                    ]}
                  />
                  {errors.password && (
                    <Text style={styles.errorText}>{errors.password.message}</Text>
                  )}
                </View>
              )}
            />

            <TouchableOpacity
              style={[styles.button, styles.loginButton]}
              onPress={handleSubmit(onLogin)}
              disabled={loading}
            >
              {loading ? (
                <ActivityIndicator color="#fff" />
              ) : (
                <Text style={styles.buttonText}>登录</Text>
              )}
            </TouchableOpacity>
          </View>
        )}

        {/* 搜索示例 */}
        <View style={styles.section}>
          <Text style={styles.sectionTitle}>🔍 防抖搜索 (useDebounce)</Text>
          <TextInput
            value={searchText}
            onChangeText={setSearchText}
            placeholder="输入搜索内容..."
            style={styles.input}
          />
          {searchResults.length > 0 && (
            <View style={styles.searchResults}>
              {searchResults.map((result, index) => (
                <Text key={index} style={styles.searchResult}>
                  {result}
                </Text>
              ))}
            </View>
          )}
        </View>

        {/* 节流点击示例 */}
        <View style={styles.section}>
          <Text style={styles.sectionTitle}>⏱️ 节流点击 (useThrottle)</Text>
          <Text style={styles.infoText}>点击次数: {counter}</Text>
          <TouchableOpacity
            style={[styles.button, styles.primaryButton]}
            onPress={throttledClick}
          >
            <Text style={styles.buttonText}>快速点击测试（1秒节流）</Text>
          </TouchableOpacity>
        </View>

        {/* 本地存储示例 */}
        <View style={styles.section}>
          <Text style={styles.sectionTitle}>💾 本地存储 (AsyncStorage)</Text>
          <View style={styles.buttonRow}>
            <TouchableOpacity
              style={[styles.button, styles.primaryButton, styles.halfButton]}
              onPress={handleSaveToStorage}
            >
              <Text style={styles.buttonText}>保存数据</Text>
            </TouchableOpacity>
            <TouchableOpacity
              style={[styles.button, styles.secondaryButton, styles.halfButton]}
              onPress={handleLoadFromStorage}
            >
              <Text style={styles.buttonText}>读取数据</Text>
            </TouchableOpacity>
          </View>
          {storageValue && (
            <View style={styles.codeBlock}>
              <Text style={styles.codeText}>{storageValue}</Text>
            </View>
          )}
        </View>

        {/* 日期格式化示例 */}
        <View style={styles.section}>
          <Text style={styles.sectionTitle}>📅 日期格式化 (Day.js)</Text>
          <Text style={styles.infoText}>
            当前时间: {formatDate(new Date(), 'YYYY-MM-DD HH:mm:ss')}
          </Text>
          <Text style={styles.infoText}>
            相对时间: {formatRelativeTime(new Date())}
          </Text>
          <Text style={styles.infoText}>
            聊天时间: {formatChatTime(Date.now())}
          </Text>
        </View>

        {/* 设置示例 */}
        <View style={styles.section}>
          <Text style={styles.sectionTitle}>⚙️ 应用设置</Text>
          
          <View style={styles.settingRow}>
            <Text style={styles.settingLabel}>主题: {theme}</Text>
            <TouchableOpacity
              style={[styles.button, styles.smallButton]}
              onPress={handleThemeChange}
            >
              <Text style={styles.buttonText}>切换</Text>
            </TouchableOpacity>
          </View>

          <View style={styles.settingRow}>
            <Text style={styles.settingLabel}>语言: {language}</Text>
            <TouchableOpacity
              style={[styles.button, styles.smallButton]}
              onPress={handleLanguageChange}
            >
              <Text style={styles.buttonText}>切换</Text>
            </TouchableOpacity>
          </View>

          <View style={styles.settingRow}>
            <Text style={styles.settingLabel}>触觉反馈</Text>
            <Switch
              value={hapticsEnabled}
              onValueChange={(value) => {
                haptics.selection();
                setHapticsEnabled(value);
              }}
            />
          </View>
        </View>

        {/* 触觉反馈示例 */}
        <View style={styles.section}>
          <Text style={styles.sectionTitle}>📳 触觉反馈 (Expo Haptics)</Text>
          <View style={styles.buttonGrid}>
            <TouchableOpacity
              style={[styles.button, styles.hapticsButton]}
              onPress={() => haptics.light()}
            >
              <Text style={styles.buttonText}>Light</Text>
            </TouchableOpacity>
            <TouchableOpacity
              style={[styles.button, styles.hapticsButton]}
              onPress={() => haptics.medium()}
            >
              <Text style={styles.buttonText}>Medium</Text>
            </TouchableOpacity>
            <TouchableOpacity
              style={[styles.button, styles.hapticsButton]}
              onPress={() => haptics.heavy()}
            >
              <Text style={styles.buttonText}>Heavy</Text>
            </TouchableOpacity>
            <TouchableOpacity
              style={[styles.button, styles.successButton]}
              onPress={() => haptics.success()}
            >
              <Text style={styles.buttonText}>Success</Text>
            </TouchableOpacity>
            <TouchableOpacity
              style={[styles.button, styles.warningButton]}
              onPress={() => haptics.warning()}
            >
              <Text style={styles.buttonText}>Warning</Text>
            </TouchableOpacity>
            <TouchableOpacity
              style={[styles.button, styles.errorButton]}
              onPress={() => haptics.error()}
            >
              <Text style={styles.buttonText}>Error</Text>
            </TouchableOpacity>
          </View>
        </View>

        <View style={styles.footer}>
          <Text style={styles.footerText}>
            查看代码了解更多使用方法 📖
          </Text>
        </View>
      </View>
    </ScrollView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#f5f5f5',
  },
  content: {
    padding: 16,
  },
  title: {
    fontSize: 28,
    fontWeight: 'bold',
    marginBottom: 8,
    color: '#333',
  },
  subtitle: {
    fontSize: 16,
    color: '#666',
    marginBottom: 24,
  },
  section: {
    backgroundColor: '#fff',
    borderRadius: 12,
    padding: 16,
    marginBottom: 16,
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 2 },
    shadowOpacity: 0.1,
    shadowRadius: 4,
    elevation: 3,
  },
  sectionTitle: {
    fontSize: 18,
    fontWeight: '600',
    marginBottom: 12,
    color: '#333',
  },
  userInfo: {
    flexDirection: 'row',
    alignItems: 'center',
  },
  avatar: {
    width: 60,
    height: 60,
    borderRadius: 30,
    marginRight: 12,
  },
  userDetails: {
    flex: 1,
  },
  userName: {
    fontSize: 16,
    fontWeight: '600',
    color: '#333',
  },
  userEmail: {
    fontSize: 14,
    color: '#666',
    marginTop: 2,
  },
  userDate: {
    fontSize: 12,
    color: '#999',
    marginTop: 4,
  },
  inputGroup: {
    marginBottom: 16,
  },
  label: {
    fontSize: 14,
    fontWeight: '500',
    marginBottom: 6,
    color: '#333',
  },
  input: {
    borderWidth: 1,
    borderColor: '#ddd',
    borderRadius: 8,
    padding: 12,
    fontSize: 16,
    backgroundColor: '#fff',
  },
  inputError: {
    borderColor: '#ff3b30',
  },
  errorText: {
    color: '#ff3b30',
    fontSize: 12,
    marginTop: 4,
  },
  button: {
    paddingVertical: 12,
    paddingHorizontal: 20,
    borderRadius: 8,
    alignItems: 'center',
    justifyContent: 'center',
  },
  buttonText: {
    color: '#fff',
    fontSize: 16,
    fontWeight: '600',
  },
  loginButton: {
    backgroundColor: '#007AFF',
    marginTop: 8,
  },
  logoutButton: {
    backgroundColor: '#ff3b30',
    paddingVertical: 8,
    paddingHorizontal: 16,
  },
  primaryButton: {
    backgroundColor: '#007AFF',
  },
  secondaryButton: {
    backgroundColor: '#5856D6',
  },
  smallButton: {
    backgroundColor: '#007AFF',
    paddingVertical: 8,
    paddingHorizontal: 16,
  },
  buttonRow: {
    flexDirection: 'row',
    gap: 12,
  },
  halfButton: {
    flex: 1,
  },
  searchResults: {
    marginTop: 12,
  },
  searchResult: {
    padding: 12,
    backgroundColor: '#f9f9f9',
    borderRadius: 8,
    marginBottom: 8,
    color: '#333',
  },
  infoText: {
    fontSize: 14,
    color: '#666',
    marginBottom: 8,
  },
  codeBlock: {
    backgroundColor: '#f9f9f9',
    borderRadius: 8,
    padding: 12,
    marginTop: 12,
  },
  codeText: {
    fontFamily: 'monospace',
    fontSize: 12,
    color: '#333',
  },
  settingRow: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    marginBottom: 12,
  },
  settingLabel: {
    fontSize: 16,
    color: '#333',
  },
  buttonGrid: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    gap: 8,
  },
  hapticsButton: {
    backgroundColor: '#5856D6',
    flex: 1,
    minWidth: '30%',
  },
  successButton: {
    backgroundColor: '#34C759',
    flex: 1,
    minWidth: '30%',
  },
  warningButton: {
    backgroundColor: '#FF9500',
    flex: 1,
    minWidth: '30%',
  },
  errorButton: {
    backgroundColor: '#FF3B30',
    flex: 1,
    minWidth: '30%',
  },
  footer: {
    marginTop: 24,
    marginBottom: 40,
    alignItems: 'center',
  },
  footerText: {
    fontSize: 14,
    color: '#999',
  },
});