secra-memory 0.1.1

/// Secra Memory 使用示例
///
/// 本示例展示了如何使用 secra-memory 库进行内存缓存管理
use secra_memory::{Cache, MemoryConfig, MemoryManager, CacheError};
use serde::{Deserialize, Serialize};
use std::time::Duration;

/// 用户信息结构体
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
struct User {
    id: u64,
    name: String,
    email: String,
    avatar: Option<String>,
}

/// 订单信息结构体
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
struct Order {
    id: String,
    user_id: u64,
    amount: f64,
    status: String,
    items: Vec<OrderItem>,
}

/// 订单项结构体
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
struct OrderItem {
    product_id: u64,
    quantity: u32,
    price: f64,
}

#[tokio::main(flavor = "current_thread")]
async fn main() -> Result<(), CacheError> {
    println!("=== Secra Memory 使用示例 ===\n");

    // 1. 创建 MemoryManager（使用默认配置）
    println!("1. 创建 MemoryManager（使用默认配置）");
    let memory_manager = MemoryManager::new_with_defaults();
    println!("✓ MemoryManager 创建成功\n");

    // 2. 使用自定义配置创建 MemoryManager
    println!("2. 使用自定义配置创建 MemoryManager");
    let mut custom_config = MemoryConfig::default();
    custom_config.system_name = "demo_system".to_string();
    custom_config.initial_capacity = 1000;
    custom_config.max_capacity = 10_000;
    custom_config.default_ttl = Duration::from_secs(3600);
    let _custom_manager = MemoryManager::new(custom_config);
    println!("✓ 自定义配置的 MemoryManager 创建成功\n");

    // 3. 为插件创建缓存实例
    println!("3. 为插件创建缓存实例");
    let user_plugin_cache = memory_manager.create_plugin_cache("user_plugin".to_string());
    let order_plugin_cache = memory_manager.create_plugin_cache("order_plugin".to_string());
    println!("✓ 插件缓存实例创建成功\n");

    // 4. 基本 CRUD 操作 - 用户信息缓存
    println!("4. 基本 CRUD 操作 - 用户信息缓存");
    demo_user_cache(&user_plugin_cache).await?;
    println!();

    // 5. 模块化缓存管理 - 订单缓存
    println!("5. 模块化缓存管理 - 订单缓存");
    demo_order_cache(&order_plugin_cache).await?;
    println!();

    // 6. 缓存存在性检查
    println!("6. 缓存存在性检查");
    demo_cache_exists(&user_plugin_cache).await?;
    println!();

    // 7. 模块清理功能
    println!("7. 模块清理功能");
    demo_module_clear(&order_plugin_cache).await?;
    println!();

    // 8. 插件生命周期管理
    println!("8. 插件生命周期管理");
    demo_plugin_lifecycle(&memory_manager).await?;
    println!();

    // 9. 错误处理示例
    println!("9. 错误处理示例");
    demo_error_handling(&user_plugin_cache).await?;
    println!();

    // 10. 多插件隔离示例
    println!("10. 多插件隔离示例");
    demo_plugin_isolation(&memory_manager).await?;
    println!();

    println!("=== 示例运行完成 ===");
    Ok(())
}

/// 演示用户信息缓存的基本操作
async fn demo_user_cache(cache: &impl Cache) -> Result<(), CacheError> {
    // 创建用户数据
    let user = User {
        id: 123,
        name: "Alice".to_string(),
        email: "alice@example.com".to_string(),
        avatar: Some("https://example.com/avatar/alice.jpg".to_string()),
    };

    // 设置缓存
    let key = "user:123";
    cache.set(key, &user, None).await?;
    println!("  ✓ 设置用户缓存: {}", key);

    // 获取缓存
    let cached_user: Option<User> = cache.get(key).await?;
    match cached_user {
        Some(u) => {
            println!("  ✓ 获取用户缓存成功: {:?}", u);
            assert_eq!(u, user);
        }
        None => println!("  ✗ 用户缓存不存在"),
    }

    // 更新缓存
    let updated_user = User {
        id: 123,
        name: "Alice Updated".to_string(),
        email: "alice.updated@example.com".to_string(),
        avatar: user.avatar.clone(),
    };
    cache.set(key, &updated_user, None).await?;
    println!("  ✓ 更新用户缓存");

    // 验证更新
    let cached: Option<User> = cache.get(key).await?;
    if let Some(u) = cached {
        assert_eq!(u.name, "Alice Updated");
        println!("  ✓ 用户缓存更新成功: {}", u.name);
    }

    // 删除缓存
    let deleted = cache.delete(key).await?;
    if deleted {
        println!("  ✓ 删除用户缓存成功");
    }

    // 验证删除
    let cached: Option<User> = cache.get(key).await?;
    assert!(cached.is_none());
    println!("  ✓ 验证删除成功（缓存已不存在）");

    Ok(())
}

/// 演示订单缓存的模块化管理
async fn demo_order_cache(cache: &impl Cache) -> Result<(), CacheError> {
    // 创建多个订单
    let orders = vec![
        Order {
            id: "ORD-001".to_string(),
            user_id: 123,
            amount: 99.99,
            status: "pending".to_string(),
            items: vec![
                OrderItem {
                    product_id: 1,
                    quantity: 2,
                    price: 49.99,
                },
            ],
        },
        Order {
            id: "ORD-002".to_string(),
            user_id: 123,
            amount: 199.99,
            status: "completed".to_string(),
            items: vec![
                OrderItem {
                    product_id: 2,
                    quantity: 1,
                    price: 199.99,
                },
            ],
        },
        Order {
            id: "ORD-003".to_string(),
            user_id: 456,
            amount: 299.99,
            status: "pending".to_string(),
            items: vec![
                OrderItem {
                    product_id: 3,
                    quantity: 3,
                    price: 99.99,
                },
            ],
        },
    ];

    // 使用 order 模块存储订单
    for order in &orders {
        let key = format!("order:{}", order.id);
        cache.set(&key, order, None).await?;
        println!("  ✓ 设置订单缓存: {}", key);
    }

    // 获取订单
    let key = "order:ORD-001";
    let cached_order: Option<Order> = cache.get(key).await?;
    if let Some(order) = cached_order {
        println!("  ✓ 获取订单缓存成功: {} (金额: {})", order.id, order.amount);
    }

    Ok(())
}

/// 演示缓存存在性检查
async fn demo_cache_exists(cache: &impl Cache) -> Result<(), CacheError> {
    let key = "user:999";

    // 检查不存在的缓存
    let exists = cache.exists(key).await?;
    println!("  ✓ 检查不存在的缓存: {} (存在: {})", key, exists);
    assert!(!exists);

    // 设置缓存
    let user = User {
        id: 999,
        name: "Test User".to_string(),
        email: "test@example.com".to_string(),
        avatar: None,
    };
    cache.set(key, &user, None).await?;
    println!("  ✓ 设置缓存: {}", key);

    // 再次检查
    let exists = cache.exists(key).await?;
    println!("  ✓ 检查存在的缓存: {} (存在: {})", key, exists);
    assert!(exists);

    // 清理
    cache.delete(key).await?;

    Ok(())
}

/// 演示模块清理功能
async fn demo_module_clear(cache: &impl Cache) -> Result<(), CacheError> {
    // 创建不同模块的缓存
    let config_key = "config:app:theme";
    let config_value = "dark";
    cache.set(config_key, &config_value, None).await?;
    println!("  ✓ 设置配置缓存: {}", config_key);

    let order_key = "order:ORD-999";
    let order = Order {
        id: "ORD-999".to_string(),
        user_id: 123,
        amount: 99.99,
        status: "pending".to_string(),
        items: vec![],
    };
    cache.set(order_key, &order, None).await?;
    println!("  ✓ 设置订单缓存: {}", order_key);

    // 清理 order 模块的缓存
    let cleared_count = cache.clear_module("order").await?;
    println!("  ✓ 清理 order 模块缓存，删除了 {} 个 Key", cleared_count);

    // 验证 order 模块的缓存已清理
    let cached_order: Option<Order> = cache.get(order_key).await?;
    assert!(cached_order.is_none());
    println!("  ✓ 验证 order 模块缓存已清理");

    // 验证 config 模块的缓存仍然存在
    let cached_config: Option<String> = cache.get(config_key).await?;
    assert!(cached_config.is_some());
    println!("  ✓ 验证 config 模块缓存仍然存在");

    // 清理所有缓存
    let cleared_count = cache.clear().await?;
    println!("  ✓ 清理所有缓存，删除了 {} 个 Key", cleared_count);

    Ok(())
}

/// 演示插件生命周期管理
async fn demo_plugin_lifecycle(manager: &MemoryManager) -> Result<(), CacheError> {
    let plugin_id = "demo_plugin";

    // 为插件创建缓存
    let cache = manager.create_plugin_cache(plugin_id.to_string());

    // 设置一些缓存数据
    let user = User {
        id: 1,
        name: "Demo User".to_string(),
        email: "demo@example.com".to_string(),
        avatar: None,
    };
    cache.set("user:1", &user, None).await?;
    cache.set("user:2", &user, None).await?;
    println!("  ✓ 为插件设置了 2 个缓存项");

    // 插件升级场景 - 清理旧版本缓存
    let cleared = manager.clear_plugin_for_upgrade(plugin_id).await?;
    println!("  ✓ 插件升级清理缓存，删除了 {} 个 Key", cleared);

    // 插件禁用场景 - 不强制清理
    cache.set("user:1", &user, None).await?;
    let cleared = manager.clear_plugin_for_disable(plugin_id, false).await?;
    println!("  ✓ 插件禁用（不强制清理），删除了 {} 个 Key", cleared);

    // 插件禁用场景 - 强制清理
    let cleared = manager.clear_plugin_for_disable(plugin_id, true).await?;
    println!("  ✓ 插件禁用（强制清理），删除了 {} 个 Key", cleared);

    Ok(())
}

/// 演示错误处理
async fn demo_error_handling(cache: &impl Cache) -> Result<(), CacheError> {
    // 测试空 Key
    match cache.set("", &"value", None).await {
        Err(CacheError::InvalidKey(msg)) => {
            println!("  ✓ 捕获到预期的错误（空 Key）: {}", msg);
        }
        Ok(_) => println!("  ✗ 应该返回错误但没有"),
        Err(e) => println!("  ✗ 意外的错误类型: {:?}", e),
    }

    // 测试包含非法字符的 Key
    match cache.set("user@123", &"value", None).await {
        Err(CacheError::InvalidKey(msg)) => {
            println!("  ✓ 捕获到预期的错误（非法字符）: {}", msg);
        }
        Ok(_) => println!("  ✗ 应该返回错误但没有"),
        Err(e) => println!("  ✗ 意外的错误类型: {:?}", e),
    }

    // 测试包含命名空间前缀的 Key（防止绕过隔离）
    match cache.set("secra:plugin:other_plugin:user:123", &"value", None).await {
        Err(CacheError::InvalidKey(msg)) => {
            println!("  ✓ 捕获到预期的错误（命名空间前缀）: {}", msg);
        }
        Ok(_) => println!("  ✗ 应该返回错误但没有"),
        Err(e) => println!("  ✗ 意外的错误类型: {:?}", e),
    }

    Ok(())
}

/// 演示多插件隔离
async fn demo_plugin_isolation(manager: &MemoryManager) -> Result<(), CacheError> {
    // 为两个不同的插件创建缓存
    let plugin1_cache = manager.create_plugin_cache("plugin_1".to_string());
    let plugin2_cache = manager.create_plugin_cache("plugin_2".to_string());

    // 两个插件使用相同的业务 Key
    let same_business_key = "user:123";

    // 插件1设置缓存
    let user1 = User {
        id: 123,
        name: "Plugin 1 User".to_string(),
        email: "plugin1@example.com".to_string(),
        avatar: None,
    };
    plugin1_cache.set(same_business_key, &user1, None).await?;
    println!("  ✓ 插件1设置缓存: {}", same_business_key);

    // 插件2设置缓存（使用相同的业务 Key）
    let user2 = User {
        id: 123,
        name: "Plugin 2 User".to_string(),
        email: "plugin2@example.com".to_string(),
        avatar: None,
    };
    plugin2_cache.set(same_business_key, &user2, None).await?;
    println!("  ✓ 插件2设置缓存: {}", same_business_key);

    // 验证隔离：两个插件获取到不同的值
    let cached1: Option<User> = plugin1_cache.get(same_business_key).await?;
    let cached2: Option<User> = plugin2_cache.get(same_business_key).await?;

    if let (Some(u1), Some(u2)) = (cached1, cached2) {
        assert_ne!(u1.name, u2.name);
        println!("  ✓ 插件隔离验证成功");
        println!("    - 插件1获取: {}", u1.name);
        println!("    - 插件2获取: {}", u2.name);
    }

    // 清理插件1的缓存，验证插件2的缓存不受影响
    let cleared1 = plugin1_cache.clear().await?;
    println!("  ✓ 清理插件1缓存，删除了 {} 个 Key", cleared1);

    let cached2_after: Option<User> = plugin2_cache.get(same_business_key).await?;
    assert!(cached2_after.is_some());
    println!("  ✓ 验证插件2缓存不受影响（仍然存在）");

    Ok(())
}