//! bridge_keys_demo —— bridge_keys 过滤 + 子↔子共享 namespace 示例。
//! Required features: cargo run --example bridge_keys_demo --features "engine"
//!
//! 演示：
//! 1. 父 session 设置 SessionMemory（key: "project_goal", "constraints", "noise"）
//! 2. dispatch + bridge_keys = ["project_goal", "constraints"] → 只继承这两个
//! 3. 验证子 session 读到的 session_memory 与过滤一致
//! 4. 演示子↔子共享 namespace：dispatch 时设 `shared_namespace`，
//!    子 A 写入 `shared:{parent_id}:fact_x`，子 B 通过约定 key 读取
//!
//! 运行：`cargo run --example bridge_keys_demo`

use std::sync::Arc;

use agcore::agent::{Agent, AgentBuilder};
use agcore::engine::{DispatchConfig, SessionManager};
use agcore::llm::hooks::HookExecutor;
use agcore::llm::mock::MockProvider;
use agcore::llm::types::Usage;
use agcore::llm::types::message::{ContentBlock, Message};
use agcore::llm::types::response_v2::{MessageResponse, StopReason};
use agcore::memory::store::InMemoryStore;
use agcore::tools::ToolRegistry;

struct WorkerAgent;

impl Agent for WorkerAgent {
    fn name(&self) -> &str {
        "worker"
    }
    fn system_prompt(&self) -> Option<&str> {
        Some("You are a worker.")
    }
}

fn assistant_text(text: &str) -> MessageResponse {
    MessageResponse {
        id: String::new(),
        model: String::new(),
        message: Message::Assistant {
            content: vec![ContentBlock::Text { text: text.into() }],
        },
        usage: Usage::from_input_output(8, 4),
        stop_reason: StopReason::Stop,
        extra: Default::default(),
    }
}

#[tokio::main]
async fn main() {
    println!("=== Bridge Keys Demo ===\n");

    let store: Arc<dyn agcore::memory::store::MemoryStore> = Arc::new(InMemoryStore::new());
    // 3 个 dispatch 调用需要 3 个 mock response
    let provider = Arc::new(MockProvider::new(vec![
        assistant_text("Worker 1: done"),
        assistant_text("Worker 2: done"),
        assistant_text("Worker 3: done"),
    ]));
    let bundle = Arc::new(
        AgentBuilder::new()
            .provider(provider)
            .tool_registry(Arc::new(ToolRegistry::new()))
            .hook_executor(Arc::new(HookExecutor::new()))
            .session_memory_backend(store.clone())
            .build()
            .expect("RuntimeBundle"),
    );

    let worker: Arc<dyn Agent> = Arc::new(WorkerAgent);

    let sm = Arc::new(SessionManager::new(store));
    let parent_id = sm
        .create(worker.clone(), bundle.clone())
        .await
        .expect("create");
    println!("[1] parent session created: {parent_id}");

    // 父 session_memory 写入 3 个 key
    {
        let session = sm.get(&parent_id).await.unwrap();
        let mut guard = session.lock().await;
        guard
            .set_session_data("project_goal", "Build a fast compiler")
            .await
            .unwrap();
        guard
            .set_session_data("constraints", "Rust, no unsafe")
            .await
            .unwrap();
        guard
            .set_session_data("noise", "should NOT be inherited")
            .await
            .unwrap();
    }
    println!("[2] parent set 3 keys: project_goal, constraints, noise");

    // dispatch + bridge_keys 过滤
    let config = DispatchConfig {
        bridge_keys: Some(vec!["project_goal".to_string(), "constraints".to_string()]),
        ..Default::default()
    };
    let result = sm
        .dispatch(&parent_id, worker.clone(), "do work", config)
        .await
        .expect("dispatch");
    println!(
        "[3] dispatched sub-agent (child_id={})\n",
        &result.child_id[..20]
    );

    // 验证过滤效果
    let child_session = sm.get(&result.child_id).await.unwrap();
    let child_guard = child_session.lock().await;
    let inherited_goal = child_guard
        .session_memory()
        .get("project_goal")
        .await
        .unwrap();
    let inherited_constraint = child_guard
        .session_memory()
        .get("constraints")
        .await
        .unwrap();
    let filtered_noise = child_guard.session_memory().get("noise").await.unwrap();
    drop(child_guard);

    println!("[verify] inherited keys in child session:");
    println!("  - project_goal: {:?}", inherited_goal);
    println!("  - constraints: {:?}", inherited_constraint);
    println!("  - noise:       {:?} (should be None)", filtered_noise);

    assert_eq!(inherited_goal, Some("Build a fast compiler".to_string()));
    assert_eq!(inherited_constraint, Some("Rust, no unsafe".to_string()));
    assert_eq!(filtered_noise, None, "noise should be filtered out");

    println!("\n✓ bridge_keys filtering works correctly");

    // =============== 第二部分：子↔子共享 namespace（convention）===============
    println!("\n=== Part 2: Child↔Child Shared Namespace (convention) ===\n");

    // 关键点：`SessionMemory::get`/`set` 通过 session 自身 namespace 隔离
    // （每个 session 一个独立 namespace），所以"子↔子共享"不能直接通过 SessionMemory。
    // 真正的子↔子共享需要直接操作底层 MemoryStore，或由上层应用维护一个
    // 跨 session 的"共享通道"（例如独立的 namespace + 所有子 session 知道 key 前缀）。
    //
    // 本 demo 演示通过 DispatchConfig.shared_namespace（convention-based）：
    // - `shared_namespace: Some(prefix)` 作为约定标记，告知子 agent
    //   "你的数据共享 namespace 是 shared:{prefix}:*"
    // - 子 agent 自行通过 `sm.store()` 直接操作 MemoryStore（绕过 SessionMemory 的 namespace 隔离）
    //
    // 演示 2 个子 agent 通过约定 namespace prefix 共享数据。

    let shared_ns_config = DispatchConfig {
        bridge_keys: Some(vec![]),
        shared_namespace: Some("parent-123".to_string()),
        ..Default::default()
    };

    // dispatch 第一个子 agent
    let _researcher_result = sm
        .dispatch(
            &parent_id,
            worker.clone(),
            "research task",
            shared_ns_config.clone(),
        )
        .await
        .expect("dispatch researcher");

    // 子 A 通过 `sm.store()` 直接写入共享 namespace key
    // (约定 prefix: "shared:parent-123:")
    let shared_key = "shared:parent-123:fact_architecture";
    sm.store()
        .save(agcore::memory::types::MemoryItem {
            id: shared_key.to_string(),
            content: "Microservices with event sourcing".to_string(),
            metadata: serde_json::json!({}),
            created_at: time::OffsetDateTime::now_utc(),
        })
        .await
        .expect("save shared fact");
    println!("[4] researcher wrote {shared_key}");

    // dispatch 第二个子 agent
    let _writer_result = sm
        .dispatch(&parent_id, worker.clone(), "writing task", shared_ns_config)
        .await
        .expect("dispatch writer");

    // 子 B 通过 `sm.store()` 直接读取共享 namespace key
    let read_item = sm.store().get(shared_key).await.expect("get");
    let read_fact = read_item.map(|i| i.content);
    println!("[5] writer reads {shared_key} = {read_fact:?}");

    assert_eq!(
        read_fact,
        Some("Microservices with event sourcing".to_string()),
        "writer should read researcher's shared fact"
    );

    println!("\n✓ child↔child shared namespace works correctly (via MemoryStore convention)");
    println!("\n=== All Bridge Keys Demo checks passed ===");
}