use axum::body::{Body, to_bytes};
use axum::http::{Request, StatusCode, header};
use nx9_wg_api::auth::{BootstrapOptions, bootstrap_admin};
use nx9_wg_api::routes::build_api_router;
use nx9_wg_api::state::AppState;
use nx9_wg_core::config::AppConfig;
use nx9_wg_db::Store;
use nx9_wg_network::SimulatedNetworkEngine;
use nx9_wireguard::SimulatedWireGuardEngine;
use serde_json::{Value, json};
use std::sync::Arc;
use tower::ServiceExt;

async fn setup_test_app() -> (axum::Router, String) {
    let store = Store::connect_in_memory().await.expect("connect in-memory");
    store.migrate().await.expect("migrate");

    let config = AppConfig::default();
    let opts = BootstrapOptions {
        cli_password: Some("AdminSecret123!".to_string()),
        ..Default::default()
    };
    bootstrap_admin(&store, &config, &opts)
        .await
        .expect("bootstrap");

    let state = AppState::with_engines(
        store,
        Arc::new(SimulatedWireGuardEngine::new()),
        Arc::new(SimulatedNetworkEngine::new()),
    );
    let app = build_api_router(state.clone());

    // Login to get session ID
    let login_req = Request::builder()
        .method("POST")
        .uri("/api/v1/auth/login")
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "username": "admin",
                "password": "AdminSecret123!"
            })
            .to_string(),
        ))
        .unwrap();

    let resp = app.clone().oneshot(login_req).await.expect("login request");
    assert_eq!(resp.status(), StatusCode::OK);

    let cookie_header = resp
        .headers()
        .get(header::SET_COOKIE)
        .expect("set-cookie")
        .to_str()
        .unwrap();
    let session_cookie = cookie_header.split(';').next().unwrap().to_string();

    (app, session_cookie)
}

#[tokio::test]
async fn test_public_health_and_version_endpoints() {
    let (app, _) = setup_test_app().await;

    // Health
    let req = Request::builder()
        .uri("/api/v1/system/health")
        .body(Body::empty())
        .unwrap();
    let resp = app.clone().oneshot(req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
    let body = to_bytes(resp.into_body(), usize::MAX).await.unwrap();
    let val: Value = serde_json::from_slice(&body).unwrap();
    assert_eq!(val["status"], "healthy");
    assert_eq!(val["database"], "connected");

    // Version
    let req = Request::builder()
        .uri("/api/v1/system/version")
        .body(Body::empty())
        .unwrap();
    let resp = app.oneshot(req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
    let body = to_bytes(resp.into_body(), usize::MAX).await.unwrap();
    let val: Value = serde_json::from_slice(&body).unwrap();
    assert_eq!(val["name"], "nx9-wg");
    assert_eq!(val["version"], "1.1.0");
}

#[tokio::test]
async fn test_protected_route_unauthenticated_rejection() {
    let (app, _) = setup_test_app().await;

    // Request protected route without auth
    let req = Request::builder()
        .uri("/api/v1/system")
        .body(Body::empty())
        .unwrap();
    let resp = app.oneshot(req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::UNAUTHORIZED);
}

#[tokio::test]
async fn test_interfaces_and_peers_rest_lifecycle() {
    let (app, cookie) = setup_test_app().await;

    // 1. Create interface
    let create_iface_req = Request::builder()
        .method("POST")
        .uri("/api/v1/interfaces")
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "wg0",
                "listen_port": 51820,
                "address_v4": "10.0.0.1/24",
                "dns": "1.1.1.1"
            })
            .to_string(),
        ))
        .unwrap();

    let resp = app.clone().oneshot(create_iface_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
    let body = to_bytes(resp.into_body(), usize::MAX).await.unwrap();
    let iface_val: Value = serde_json::from_slice(&body).unwrap();
    let iface_id = iface_val["id"].as_str().unwrap();
    assert_eq!(iface_val["name"], "wg0");

    // 2. List interfaces
    let list_req = Request::builder()
        .uri("/api/v1/interfaces")
        .header(header::COOKIE, &cookie)
        .body(Body::empty())
        .unwrap();
    let resp = app.clone().oneshot(list_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);

    // 3. Create peer under interface
    let create_peer_req = Request::builder()
        .method("POST")
        .uri(format!("/api/v1/interfaces/{iface_id}/peers"))
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "laptop-alice",
                "peer_type": "road_warrior",
                "profile": "full_tunnel",
                "allowed_ips": "10.0.0.2/32"
            })
            .to_string(),
        ))
        .unwrap();

    let resp = app.clone().oneshot(create_peer_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
    let body = to_bytes(resp.into_body(), usize::MAX).await.unwrap();
    let peer_val: Value = serde_json::from_slice(&body).unwrap();
    let peer_id = peer_val["id"].as_str().unwrap();
    assert_eq!(peer_val["name"], "laptop-alice");

    // 4. Disable peer
    let disable_req = Request::builder()
        .method("POST")
        .uri(format!("/api/v1/peers/{peer_id}/disable"))
        .header(header::COOKIE, &cookie)
        .body(Body::empty())
        .unwrap();
    let resp = app.clone().oneshot(disable_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);

    // 5. Get peer and verify state
    let get_peer_req = Request::builder()
        .uri(format!("/api/v1/peers/{peer_id}"))
        .header(header::COOKIE, &cookie)
        .body(Body::empty())
        .unwrap();
    let resp = app.clone().oneshot(get_peer_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
    let body = to_bytes(resp.into_body(), usize::MAX).await.unwrap();
    let peer_val: Value = serde_json::from_slice(&body).unwrap();
    assert_eq!(peer_val["state"], "disabled");

    // 6. Delete wg0 interface (must be rejected with 403 Forbidden)
    let del_wg0_req = Request::builder()
        .method("DELETE")
        .uri(format!("/api/v1/interfaces/{iface_id}"))
        .header(header::COOKIE, &cookie)
        .body(Body::empty())
        .unwrap();
    let resp = app.clone().oneshot(del_wg0_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::FORBIDDEN);

    // 7. Restart wg0 interface (must succeed)
    let restart_wg0_req = Request::builder()
        .method("POST")
        .uri(format!("/api/v1/interfaces/{iface_id}/restart"))
        .header(header::COOKIE, &cookie)
        .body(Body::empty())
        .unwrap();
    let resp = app.clone().oneshot(restart_wg0_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);

    // 8. Create secondary interface and delete it (must succeed)
    let create_sec_req = Request::builder()
        .method("POST")
        .uri("/api/v1/interfaces")
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "custom0",
                "listen_port": 51822,
                "address_v4": "10.200.0.1/24"
            })
            .to_string(),
        ))
        .unwrap();
    let resp = app.clone().oneshot(create_sec_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
    let body = to_bytes(resp.into_body(), usize::MAX).await.unwrap();
    let sec_val: Value = serde_json::from_slice(&body).unwrap();
    let sec_id = sec_val["id"].as_str().unwrap();

    let del_sec_req = Request::builder()
        .method("DELETE")
        .uri(format!("/api/v1/interfaces/{sec_id}"))
        .header(header::COOKIE, &cookie)
        .body(Body::empty())
        .unwrap();
    let resp = app.clone().oneshot(del_sec_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
}

#[tokio::test]
async fn test_networks_and_firewall_rest_lifecycle() {
    let (app, cookie) = setup_test_app().await;

    // Create network
    let net_req = Request::builder()
        .method("POST")
        .uri("/api/v1/networks")
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "Management Network",
                "cidr": "10.10.0.0/16",
                "description": "Internal management"
            })
            .to_string(),
        ))
        .unwrap();
    let resp = app.clone().oneshot(net_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);

    // Create firewall rule
    let fw_req = Request::builder()
        .method("POST")
        .uri("/api/v1/firewall/rules")
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "Allow HTTPS",
                "direction": "in",
                "action": "accept",
                "protocol": "tcp",
                "destination_port": 443,
                "priority": 10
            })
            .to_string(),
        ))
        .unwrap();
    let resp = app.clone().oneshot(fw_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
    let body = to_bytes(resp.into_body(), usize::MAX).await.unwrap();
    let rule_val: Value = serde_json::from_slice(&body).unwrap();
    assert_eq!(rule_val["name"], "Allow HTTPS");
    assert_eq!(rule_val["priority"], 10);
}

#[tokio::test]
async fn test_list_all_peers_collection_endpoint() {
    let (app, cookie) = setup_test_app().await;

    // 1. Verify unauthenticated GET /api/v1/peers returns 401 Unauthorized
    let unauth_req = Request::builder()
        .uri("/api/v1/peers")
        .body(Body::empty())
        .unwrap();
    let unauth_resp = app.clone().oneshot(unauth_req).await.unwrap();
    assert_eq!(unauth_resp.status(), StatusCode::UNAUTHORIZED);

    // 2. Create first interface (wg0)
    let iface0_req = Request::builder()
        .method("POST")
        .uri("/api/v1/interfaces")
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "wg0",
                "listen_port": 51820,
                "address_v4": "10.100.0.1/24"
            })
            .to_string(),
        ))
        .unwrap();
    let iface0_resp = app.clone().oneshot(iface0_req).await.unwrap();
    assert_eq!(iface0_resp.status(), StatusCode::OK);
    let iface0_val: Value =
        serde_json::from_slice(&to_bytes(iface0_resp.into_body(), usize::MAX).await.unwrap())
            .unwrap();
    let iface0_id = iface0_val["id"].as_str().unwrap();

    // 3. Create second interface (wg1)
    let iface1_req = Request::builder()
        .method("POST")
        .uri("/api/v1/interfaces")
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "wg1",
                "listen_port": 51821,
                "address_v4": "10.200.0.1/24"
            })
            .to_string(),
        ))
        .unwrap();
    let iface1_resp = app.clone().oneshot(iface1_req).await.unwrap();
    assert_eq!(iface1_resp.status(), StatusCode::OK);
    let iface1_val: Value =
        serde_json::from_slice(&to_bytes(iface1_resp.into_body(), usize::MAX).await.unwrap())
            .unwrap();
    let iface1_id = iface1_val["id"].as_str().unwrap();

    // 4. Create 2 peers under wg0
    let peer_alice_req = Request::builder()
        .method("POST")
        .uri(format!("/api/v1/interfaces/{iface0_id}/peers"))
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "peer-alice",
                "allowed_ips": "10.100.0.2/32"
            })
            .to_string(),
        ))
        .unwrap();
    let resp_alice = app.clone().oneshot(peer_alice_req).await.unwrap();
    assert_eq!(resp_alice.status(), StatusCode::OK);

    let peer_bob_req = Request::builder()
        .method("POST")
        .uri(format!("/api/v1/interfaces/{iface0_id}/peers"))
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "peer-bob",
                "allowed_ips": "10.100.0.3/32"
            })
            .to_string(),
        ))
        .unwrap();
    let resp_bob = app.clone().oneshot(peer_bob_req).await.unwrap();
    assert_eq!(resp_bob.status(), StatusCode::OK);

    // 5. Create 1 peer under wg1
    let peer_charlie_req = Request::builder()
        .method("POST")
        .uri(format!("/api/v1/interfaces/{iface1_id}/peers"))
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "peer-charlie",
                "allowed_ips": "10.200.0.2/32"
            })
            .to_string(),
        ))
        .unwrap();
    let resp_charlie = app.clone().oneshot(peer_charlie_req).await.unwrap();
    assert_eq!(resp_charlie.status(), StatusCode::OK);

    // 6. Test GET /api/v1/peers (All peers across all interfaces)
    let list_all_req = Request::builder()
        .uri("/api/v1/peers")
        .header(header::COOKIE, &cookie)
        .body(Body::empty())
        .unwrap();
    let list_all_resp = app.clone().oneshot(list_all_req).await.unwrap();
    assert_eq!(list_all_resp.status(), StatusCode::OK);

    let all_peers_bytes = to_bytes(list_all_resp.into_body(), usize::MAX)
        .await
        .unwrap();
    let all_peers: Vec<Value> = serde_json::from_slice(&all_peers_bytes).unwrap();
    assert_eq!(
        all_peers.len(),
        3,
        "GET /api/v1/peers must return all 3 peers across both interfaces"
    );

    let peer_names: Vec<&str> = all_peers
        .iter()
        .map(|p| p["name"].as_str().unwrap())
        .collect();
    assert!(peer_names.contains(&"peer-alice"));
    assert!(peer_names.contains(&"peer-bob"));
    assert!(peer_names.contains(&"peer-charlie"));

    // Verify representative fields are present and valid
    for p in &all_peers {
        assert!(p["id"].is_string());
        assert!(p["public_key"].is_string());
        assert!(p["interface_id"].is_string());
        assert!(p["state"].is_string());
        assert!(p["allowed_ips"].is_string());
    }

    // 7. Verify interface-scoped endpoint still works and returns only that interface's peers
    let list_iface0_req = Request::builder()
        .uri(format!("/api/v1/interfaces/{iface0_id}/peers"))
        .header(header::COOKIE, &cookie)
        .body(Body::empty())
        .unwrap();
    let iface0_peers_resp = app.clone().oneshot(list_iface0_req).await.unwrap();
    assert_eq!(iface0_peers_resp.status(), StatusCode::OK);
    let iface0_peers: Vec<Value> = serde_json::from_slice(
        &to_bytes(iface0_peers_resp.into_body(), usize::MAX)
            .await
            .unwrap(),
    )
    .unwrap();
    assert_eq!(iface0_peers.len(), 2, "wg0 must return exactly 2 peers");

    let list_iface1_req = Request::builder()
        .uri(format!("/api/v1/interfaces/{iface1_id}/peers"))
        .header(header::COOKIE, &cookie)
        .body(Body::empty())
        .unwrap();
    let iface1_peers_resp = app.oneshot(list_iface1_req).await.unwrap();
    assert_eq!(iface1_peers_resp.status(), StatusCode::OK);
    let iface1_peers: Vec<Value> = serde_json::from_slice(
        &to_bytes(iface1_peers_resp.into_body(), usize::MAX)
            .await
            .unwrap(),
    )
    .unwrap();
    assert_eq!(iface1_peers.len(), 1, "wg1 must return exactly 1 peer");
    assert_eq!(iface1_peers[0]["name"], "peer-charlie");
}

#[tokio::test]
async fn test_peer_creation_allocates_from_selected_network() {
    let (app, cookie) = setup_test_app().await;

    // Interface Network (WireGuard transport address space)
    let create_iface_req = Request::builder()
        .method("POST")
        .uri("/api/v1/interfaces")
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "wg0",
                "listen_port": 51820,
                "address_v4": "10.100.0.1/24"
            })
            .to_string(),
        ))
        .unwrap();
    let resp = app.clone().oneshot(create_iface_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
    let iface_val: Value =
        serde_json::from_slice(&to_bytes(resp.into_body(), usize::MAX).await.unwrap()).unwrap();
    let iface_id = iface_val["id"].as_str().unwrap().to_string();
    assert_eq!(iface_val["address_v4"], "10.100.0.1/24");

    // Subnet Network (peer allocation domain)
    let create_net_req = Request::builder()
        .method("POST")
        .uri("/api/v1/networks")
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "mobile-clients",
                "cidr": "10.100.2.0/24"
            })
            .to_string(),
        ))
        .unwrap();
    let resp = app.clone().oneshot(create_net_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
    let net_val: Value =
        serde_json::from_slice(&to_bytes(resp.into_body(), usize::MAX).await.unwrap()).unwrap();
    let network_id = net_val["id"].as_str().unwrap();
    assert_eq!(net_val["cidr"], "10.100.2.0/24");

    // Exact production enrollment payload: selected Subnet Network UUID as network_id.
    let selected_peer_req = Request::builder()
        .method("POST")
        .uri(format!("/api/v1/interfaces/{iface_id}/peers"))
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "sunil-moto-mobile-network-01",
                "peer_type": "road_warrior",
                "profile": "full_tunnel",
                "mtu": 1280,
                "persistent_keepalive": 25,
                "dns": "1.1.1.1, 1.0.0.1",
                "allowed_ips": "0.0.0.0/0, ::/0",
                "network_id": network_id
            })
            .to_string(),
        ))
        .unwrap();
    let resp = app.clone().oneshot(selected_peer_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
    let selected_peer: Value =
        serde_json::from_slice(&to_bytes(resp.into_body(), usize::MAX).await.unwrap()).unwrap();
    let selected_addr = selected_peer["address_v4"].as_str().unwrap();
    assert_eq!(
        selected_addr, "10.100.2.1/32",
        "selected Network must allocate the first host of 10.100.2.0/24, got {selected_addr}"
    );
    assert!(
        selected_addr.starts_with("10.100.2."),
        "selected Network must allocate from 10.100.2.0/24, got {selected_addr}"
    );
    assert!(
        !selected_addr.starts_with("10.100.0."),
        "must not allocate from Interface Network 10.100.0.0/24 when a Subnet Network is selected, got {selected_addr}"
    );
    assert!(selected_addr.ends_with("/32"));

    // network_id = null preserves existing fallback (Interface Network CIDR)
    let fallback_peer_req = Request::builder()
        .method("POST")
        .uri(format!("/api/v1/interfaces/{iface_id}/peers"))
        .header(header::COOKIE, &cookie)
        .header(header::CONTENT_TYPE, "application/json")
        .body(Body::from(
            json!({
                "name": "bob-fallback",
                "peer_type": "road_warrior",
                "profile": "full_tunnel",
                "network_id": null
            })
            .to_string(),
        ))
        .unwrap();
    let resp = app.clone().oneshot(fallback_peer_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
    let fallback_peer: Value =
        serde_json::from_slice(&to_bytes(resp.into_body(), usize::MAX).await.unwrap()).unwrap();
    let fallback_addr = fallback_peer["address_v4"].as_str().unwrap();
    assert!(
        fallback_addr.starts_with("10.100.0."),
        "network_id=null must preserve fallback allocation from Interface Network 10.100.0.0/24, got {fallback_addr}"
    );
    assert!(
        !fallback_addr.starts_with("10.100.2."),
        "network_id=null must not allocate from a Subnet Network, got {fallback_addr}"
    );
    assert!(fallback_addr.ends_with("/32"));

    // WireGuard interface address space is unchanged
    let get_iface_req = Request::builder()
        .uri(format!("/api/v1/interfaces/{iface_id}"))
        .header(header::COOKIE, &cookie)
        .body(Body::empty())
        .unwrap();
    let resp = app.oneshot(get_iface_req).await.unwrap();
    assert_eq!(resp.status(), StatusCode::OK);
    let iface_after: Value =
        serde_json::from_slice(&to_bytes(resp.into_body(), usize::MAX).await.unwrap()).unwrap();
    assert_eq!(iface_after["name"], "wg0");
    assert_eq!(iface_after["address_v4"], "10.100.0.1/24");
}