//! Inbound Slack @mentions: signature verified BY the broker, a verified
//! mention drives a real run, and the agent's reply is gated as usual.

use std::sync::Arc;
use std::time::Duration;

use cm_api::AppState;
use cm_auth::AuthService;
use cm_domain::{Role, User, UserId, Workspace, WorkspaceId};
use cm_llm::ScriptedProvider;
use cm_runtime::{Runtime, RuntimeConfig};
use cm_secrets::{BrokerServer, FileKey};
use hmac::{Hmac, Mac};
use serde_json::{json, Value};

const SCENARIOS: &str = r##"
[[scenario]]
marker = "[[scenario:mention]]"

[[scenario.turns]]
events = [
    { type = "tool_use", name = "slack.post", input = { channel = "#general", text = "On it!" } },
]

[[scenario.turns]]
events = [
    { type = "text", text = " Replied in Slack." },
]
"##;

fn sign(secret: &str, timestamp: &str, body: &str) -> String {
    let mut mac = Hmac::<sha2::Sha256>::new_from_slice(secret.as_bytes()).unwrap();
    mac.update(format!("v0:{timestamp}:{body}").as_bytes());
    format!("v0={}", hex::encode(mac.finalize().into_bytes()))
}

async fn spawn_broker(pool: sqlx::PgPool) -> std::path::PathBuf {
    let dir = std::env::temp_dir().join(format!("tc-in-{}", uuid::Uuid::now_v7().simple()));
    std::fs::create_dir_all(&dir).unwrap();
    let key_path = dir.join("broker.key");
    FileKey::generate(&key_path).unwrap();
    let key = FileKey::load(&key_path).unwrap();
    let short = uuid::Uuid::now_v7().simple().to_string();
    let socket = std::path::PathBuf::from(format!("/tmp/tci-{}.sock", &short[short.len() - 12..]));
    let server = BrokerServer::new(pool, key, socket.clone());
    tokio::spawn(async move {
        server.serve().await.unwrap();
    });
    for _ in 0..50 {
        if socket.exists() {
            break;
        }
        tokio::time::sleep(Duration::from_millis(20)).await;
    }
    socket
}

#[tokio::test]
async fn mention_round_trip_verifies_runs_and_gates_the_reply() {
    let pool = cm_testkit::test_pool().await;
    let socket = spawn_broker(pool.clone()).await;
    let runtime = Runtime::new(
        pool.clone(),
        Arc::new(ScriptedProvider::from_toml(SCENARIOS).unwrap()),
        RuntimeConfig {
            model: "scripted".into(),
            max_tokens: 1024,
            sandboxes: None,
            browser: None,
            terminals: None,
            broker_socket: Some(socket.clone()),
            slack_base_url: "http://127.0.0.1:1".into(), // never reached here
            providers: Default::default(),
        },
    );
    let app = cm_api::router(AppState::new(pool.clone(), runtime).with_broker(socket.clone()));
    let listener = tokio::net::TcpListener::bind("127.0.0.1:0").await.unwrap();
    let addr = listener.local_addr().unwrap();
    tokio::spawn(async move {
        axum::serve(listener, app).await.unwrap();
    });
    let base = format!("http://{addr}");
    let client = reqwest::Client::new();

    // Seed + connect Slack with a JSON secret (bot token + signing secret).
    let ws = Workspace {
        id: WorkspaceId::new(),
        name: "Acme".into(),
        plan: "team".into(),
    };
    cm_db::repo::workspaces::insert(&pool, &ws).await.unwrap();
    let owner = User {
        id: UserId::new(),
        workspace_id: ws.id,
        email: format!("{}@acme.test", UserId::new()),
        role: Role::Owner,
        display_name: "Owner".into(),
        created_at: time::OffsetDateTime::UNIX_EPOCH,
    };
    cm_db::repo::users::insert(&pool, &owner).await.unwrap();
    AuthService::new(pool.clone())
        .set_password(owner.id, "pw")
        .await
        .unwrap();
    let token = client
        .post(format!("{base}/api/auth/login"))
        .json(&json!({"email": owner.email, "password": "pw"}))
        .send()
        .await
        .unwrap()
        .json::<Value>()
        .await
        .unwrap()["token"]
        .as_str()
        .unwrap()
        .to_owned();
    let claw: Value = client
        .post(format!("{base}/api/claws"))
        .bearer_auth(&token)
        .json(&json!({"name": "Scout", "job_title": "Analyst"}))
        .send()
        .await
        .unwrap()
        .json()
        .await
        .unwrap();
    let claw_id = claw["id"].as_str().unwrap();

    let signing_secret = "shh-signing";
    let connect = client
        .post(format!("{base}/api/apps/connect"))
        .bearer_auth(&token)
        .json(&json!({
            "clawId": claw_id,
            "provider": "slack",
            "authType": "keys",
            "secret": json!({"bot_token": "xoxb-in", "signing_secret": signing_secret}).to_string(),
        }))
        .send()
        .await
        .unwrap();
    assert_eq!(connect.status(), 201);

    // A forged signature is rejected outright.
    let body = json!({
        "type": "event_callback",
        "event": {"type": "app_mention", "text": "summarize [[scenario:mention]]"}
    })
    .to_string();
    // A CURRENT timestamp. It used to be the literal "12345" — a 1970 date —
    // which passed only because nothing checked freshness. The broker now
    // enforces Slack's 5-minute replay window, so a fixture that never moves
    // starts failing the moment the guard is real.
    let now = std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .unwrap()
        .as_secs()
        .to_string();

    let forged = client
        .post(format!("{base}/api/slack/events"))
        .header("x-slack-request-timestamp", &now)
        .header("x-slack-signature", "v0=deadbeef")
        .body(body.clone())
        .send()
        .await
        .unwrap();
    assert_eq!(forged.status(), 401);

    // url_verification handshake echoes the challenge when signed.
    let challenge_body = json!({"type": "url_verification", "challenge": "abc123"}).to_string();
    let challenge = client
        .post(format!("{base}/api/slack/events"))
        .header("x-slack-request-timestamp", &now)
        .header(
            "x-slack-signature",
            sign(signing_secret, &now, &challenge_body),
        )
        .body(challenge_body.clone())
        .send()
        .await
        .unwrap();
    assert_eq!(challenge.status(), 200);
    assert_eq!(
        challenge.json::<Value>().await.unwrap()["challenge"],
        "abc123"
    );

    // A correctly signed request from outside the window is refused. The
    // signature is genuine — that is the point of a replay: an attacker holding
    // one captured request must not be able to use it forever.
    let stale_ts = (now.parse::<u64>().unwrap() - 3600).to_string();
    let replayed = client
        .post(format!("{base}/api/slack/events"))
        .header("x-slack-request-timestamp", &stale_ts)
        .header("x-slack-signature", sign(signing_secret, &stale_ts, &body))
        .body(body.clone())
        .send()
        .await
        .unwrap();
    assert_eq!(
        replayed.status(),
        401,
        "a validly signed but hour-old request must be refused — otherwise one \
         captured request authenticates forever"
    );

    // A properly signed mention starts a run in the '💬 Slack' session and
    // the agent's reply is intercepted by the approval gate.
    let mention = client
        .post(format!("{base}/api/slack/events"))
        .header("x-slack-request-timestamp", &now)
        .header("x-slack-signature", sign(signing_secret, &now, &body))
        .body(body)
        .send()
        .await
        .unwrap();
    assert_eq!(mention.status(), 200);

    let agent_id = cm_domain::AgentId::from(claw_id.parse::<uuid::Uuid>().unwrap());
    let mut gated = false;
    for _ in 0..100 {
        let sessions = cm_db::repo::sessions::list_by_agent(&pool, agent_id)
            .await
            .unwrap();
        if sessions.iter().any(|s| s.title == "💬 Slack") {
            let pending = cm_safety::approvals::list_pending(&pool, ws.id)
                .await
                .unwrap();
            if pending.len() == 1 && pending[0].action_type == "slack.post" {
                gated = true;
                break;
            }
        }
        tokio::time::sleep(Duration::from_millis(50)).await;
    }
    assert!(gated, "mention must drive a run whose reply is gated");
}