//! conversation_memory_demo —— 对话记忆滑动窗口与隔离。
//! Required features: cargo run --example conversation_memory_demo --features "memory"
//!
//! 演示：
//! 1. `ConversationMemoryConfig` 构造（SlidingWindow / Full 策略）
//! 2. `add_message` 写入多角色消息（Message IR）
//! 3. 滑动窗口自动淘汰旧消息
//! 4. Full 策略保留全部
//! 5. `get_history` / `len` / `clear`
//! 6. 跨 session 数据隔离（共用 MemoryStore）
//!
//! 运行：`cargo run --example conversation_memory_demo`

use std::sync::Arc;

use agcore::llm::types::message::Message;
use agcore::memory::{ConversationMemory, ConversationMemoryConfig, InMemoryStore, MemoryStrategy};

fn message_text(msg: &Message) -> &str {
    match msg {
        Message::User { content }
        | Message::System { content }
        | Message::Assistant { content }
        | Message::ToolResult { content, .. } => content
            .iter()
            .filter_map(|b| match b {
                agcore::llm::types::message::ContentBlock::Text { text } => Some(text.as_str()),
                _ => None,
            })
            .next()
            .unwrap_or(""),
        Message::UserImage { .. } => "[image]",
        _ => "",
    }
}

#[tokio::main]
async fn main() {
    // 1. 滑动窗口策略：写入 5 条但只保留最近 3 条
    println!("=== SlidingWindow 策略（max_turns=3）===");
    let store = Arc::new(InMemoryStore::new());
    let config = ConversationMemoryConfig {
        strategy: MemoryStrategy::SlidingWindow,
        max_turns: 3,
        compact_config: None,
    };
    let mut memory = ConversationMemory::new(store, "session-1", config);

    for i in 0..5 {
        memory
            .add_message(Message::user_text(format!("消息 {i}")))
            .await
            .expect("写入失败");
    }
    println!("写入 5 条 → len = {} (期望 3)", memory.len());
    let history = memory.get_history();
    for (i, msg) in history.iter().enumerate() {
        println!("  [{}] {}", i, message_text(msg));
    }
    assert_eq!(memory.len(), 3);
    assert_eq!(message_text(&history[0]), "消息 2", "最旧应是消息 2");
    assert_eq!(message_text(&history[2]), "消息 4", "最新应是消息 4");

    // 2. Full 策略：保留全部
    println!("\n=== Full 策略（max_turns=3）===");
    let store2 = Arc::new(InMemoryStore::new());
    let config2 = ConversationMemoryConfig {
        strategy: MemoryStrategy::Full,
        max_turns: 3,
        compact_config: None,
    };
    let mut memory2 = ConversationMemory::new(store2, "session-2", config2);
    for i in 0..5 {
        memory2
            .add_message(Message::user_text(format!("Full {i}")))
            .await
            .unwrap();
    }
    println!("写入 5 条 → len = {} (期望 5)", memory2.len());
    assert_eq!(memory2.len(), 5);

    // 3. 多角色混合 + clear
    println!("\n=== 多角色写入 + clear ===");
    let store3 = Arc::new(InMemoryStore::new());
    let mut memory3 =
        ConversationMemory::new(store3, "session-3", ConversationMemoryConfig::default());
    memory3
        .add_message(Message::user_text("你好"))
        .await
        .unwrap();
    memory3
        .add_message(Message::assistant("你好！有什么可以帮你的吗？"))
        .await
        .unwrap();
    memory3
        .add_message(Message::user_text("今天天气怎么样？"))
        .await
        .unwrap();
    memory3
        .add_message(Message::assistant(
            "我无法查询实时天气，但你可以查看天气应用。",
        ))
        .await
        .unwrap();
    println!(
        "写入 4 条多角色消息 → len = {}, 最后一条: {:?}",
        memory3.len(),
        message_text(memory3.get_history().last().unwrap())
    );
    assert_eq!(memory3.len(), 4);

    memory3.clear().await.unwrap();
    println!(
        "clear 后 → len = {}, is_empty = {}",
        memory3.len(),
        memory3.is_empty()
    );
    assert!(memory3.is_empty());

    // 4. Session 隔离
    println!("\n=== Session 隔离（共用 InMemoryStore）===");
    let store4 = Arc::new(InMemoryStore::new());
    let mut a = ConversationMemory::new(store4.clone(), "s-a", ConversationMemoryConfig::default());
    let mut b = ConversationMemory::new(store4.clone(), "s-b", ConversationMemoryConfig::default());
    a.add_message(Message::user_text("A 的消息")).await.unwrap();
    b.add_message(Message::user_text("B 的消息")).await.unwrap();
    println!(
        "A.len = {}, B.len = {} (期望 1/1，互不污染)",
        a.len(),
        b.len()
    );
    assert_eq!(a.len(), 1);
    assert_eq!(b.len(), 1);

    println!("\n✓ conversation_memory_demo 完成");
}