//! AZ-646 integration tests driven by `wiremock`.
//!
//! Coverage:
//! - AC-1: happy-path GET returns `Ok(MapObjectsBundle)`; health
//!   `mapobjects_pull_state` is `synced`.
//! - AC-2: schema-invalid bundle (missing required field) returns
//!   `Err(SchemaInvalid)` — no silent acceptance.
//! - AC-3: unreachable server (a port that refuses connections) returns
//!   `Err(Unreachable)` / `MaxRetriesExceeded`; health goes Red.
//! - AC-4: a fixture sized for a 30 km × 30 km mission area validates and
//!   deserialises within the 30 s budget on loopback. We use 1 000 objects +
//!   1 000 ignored items as the proxy — a real 30×30 km mission is bounded by
//!   this order of magnitude per the AZ-666 ignored-cap NFR.

use std::time::{Duration, Instant};

use chrono::{TimeZone, Utc};
use mission_client::{MissionClient, MissionClientOptions, PullError};
use shared::health::HealthLevel;
use uuid::Uuid;
use wiremock::matchers::{method, path};
use wiremock::{Mock, MockServer, ResponseTemplate};

fn options_for(
    endpoint: &str,
    max_attempts: u32,
    tmp_dir: &std::path::Path,
) -> MissionClientOptions {
    let mut o = MissionClientOptions::new(endpoint);
    o.max_attempts = max_attempts;
    o.backoff_base = Duration::from_millis(10);
    o.backoff_cap = Duration::from_millis(50);
    o.request_timeout = Duration::from_secs(2);
    o.connect_timeout = Duration::from_secs(1);
    o.state_dir = tmp_dir.to_path_buf();
    o
}

fn good_bundle(mission_id: &str, objects: usize, ignored: usize) -> serde_json::Value {
    let map_objects: Vec<_> = (0..objects)
        .map(|i| {
            serde_json::json!({
                "h3_cell": 10_000 + i as u64,
                "mgrs_key": format!("MGRS-{i}"),
                "class": "tank",
                "class_group": "armor",
                "gps_lat": 49.0 + (i as f64) * 0.001,
                "gps_lon": 31.0 + (i as f64) * 0.001,
                "size_width_m": 3.5,
                "size_length_m": 7.0,
                "confidence": 0.85,
                "first_seen": "2026-05-19T11:00:00Z",
                "last_seen": "2026-05-19T11:30:00Z",
                "mission_id": mission_id,
                "source": "central_pulled",
                "pending_upload": false
            })
        })
        .collect();
    let ignored_items: Vec<_> = (0..ignored)
        .map(|i| {
            serde_json::json!({
                "id": Uuid::from_u128(0xdead_0000 + i as u128).to_string(),
                "mgrs": format!("MGRS-IG-{i}"),
                "h3_cell": 99_000 + i as u64,
                "class_group": "civilian",
                "decline_time": "2026-05-19T11:15:00Z",
                "mission_id": mission_id,
                "retention_scope": "mission",
                "source": "central_pulled",
                "pending_upload": false
            })
        })
        .collect();
    serde_json::json!({
        "schema_version": "1.0.0",
        "mission_id": mission_id,
        "bbox": [
            { "latitude": 49.5, "longitude": 31.0, "altitude_m": 0.0 },
            { "latitude": 49.0, "longitude": 31.5, "altitude_m": 0.0 }
        ],
        "map_objects": map_objects,
        "observations": [],
        "ignored_items": ignored_items,
        "as_of": "2026-05-19T12:00:00Z",
        "freshness": "fresh"
    })
}

#[tokio::test]
async fn ac1_happy_path_pull() {
    // Arrange
    let tmp = tempfile::tempdir().unwrap();
    let mock = MockServer::start().await;
    let mission_id = "M-mo-1";
    Mock::given(method("GET"))
        .and(path(format!("/missions/{mission_id}/mapobjects")))
        .respond_with(
            ResponseTemplate::new(200).set_body_string(good_bundle(mission_id, 3, 1).to_string()),
        )
        .expect(1)
        .mount(&mock)
        .await;
    let client =
        MissionClient::new(options_for(&mock.uri(), 3, tmp.path())).expect("client builds");
    let h = client.handle();

    // Act
    let bundle = h.pull_mapobjects(mission_id).await.expect("happy pull");

    // Assert
    assert_eq!(bundle.mission_id, mission_id);
    assert_eq!(bundle.map_objects.len(), 3);
    assert_eq!(bundle.ignored_items.len(), 1);
    let detail = h.health().detail.unwrap_or_default();
    assert!(
        detail.contains("mapobjects_pull_state=synced"),
        "health detail did not record synced: {detail}"
    );
}

#[tokio::test]
async fn ac2_schema_invalid_is_rejected() {
    // Arrange: 200 OK but the bundle is missing the required `mission_id`.
    let tmp = tempfile::tempdir().unwrap();
    let mock = MockServer::start().await;
    let mut bad = good_bundle("M-bad", 1, 0);
    let obj = bad.as_object_mut().unwrap();
    obj.remove("mission_id");
    Mock::given(method("GET"))
        .and(path("/missions/M-bad/mapobjects"))
        .respond_with(ResponseTemplate::new(200).set_body_string(bad.to_string()))
        .mount(&mock)
        .await;
    let client =
        MissionClient::new(options_for(&mock.uri(), 3, tmp.path())).expect("client builds");
    let h = client.handle();

    // Act
    let err = h.pull_mapobjects("M-bad").await.unwrap_err();

    // Assert
    match err {
        PullError::SchemaInvalid { messages, sample } => {
            assert!(messages.iter().any(|m| m.contains("mission_id")));
            assert!(!sample.is_empty());
        }
        other => panic!("expected SchemaInvalid, got {other:?}"),
    }
    assert_eq!(h.health().level, HealthLevel::Red);
}

#[tokio::test]
async fn ac3_unreachable_surfaces_failure() {
    // Arrange: a port the OS will refuse to connect to.
    let tmp = tempfile::tempdir().unwrap();
    // Bind a TcpListener to discover a free port, then immediately drop it so
    // connect() refuses.
    let listener = std::net::TcpListener::bind("127.0.0.1:0").unwrap();
    let addr = listener.local_addr().unwrap();
    drop(listener);
    let endpoint = format!("http://{addr}");
    let client = MissionClient::new(options_for(&endpoint, 2, tmp.path())).expect("client builds");
    let h = client.handle();

    // Act
    let err = h.pull_mapobjects("M-unreach").await.unwrap_err();

    // Assert
    match err {
        PullError::Unreachable(reason) => {
            assert!(!reason.is_empty(), "Unreachable reason should not be empty");
        }
        PullError::MaxRetriesExceeded { attempts, .. } => {
            assert_eq!(attempts, 2);
        }
        other => panic!("expected Unreachable or MaxRetriesExceeded, got {other:?}"),
    }
    assert_eq!(h.health().level, HealthLevel::Red);
}

#[tokio::test]
async fn ac4_large_bundle_within_budget() {
    // Arrange: 1 000 map objects + 1 000 ignored items as the proxy for a
    // 30 km × 30 km mission area on loopback.
    let tmp = tempfile::tempdir().unwrap();
    let mock = MockServer::start().await;
    let mission_id = "M-large";
    Mock::given(method("GET"))
        .and(path(format!("/missions/{mission_id}/mapobjects")))
        .respond_with(
            ResponseTemplate::new(200)
                .set_body_string(good_bundle(mission_id, 1_000, 1_000).to_string()),
        )
        .mount(&mock)
        .await;
    let client =
        MissionClient::new(options_for(&mock.uri(), 3, tmp.path())).expect("client builds");
    let h = client.handle();

    // Act
    let started = Instant::now();
    let bundle = h.pull_mapobjects(mission_id).await.expect("happy pull");
    let elapsed = started.elapsed();

    // Assert
    assert_eq!(bundle.map_objects.len(), 1000);
    assert_eq!(bundle.ignored_items.len(), 1000);
    assert!(
        elapsed < Duration::from_secs(30),
        "pull took {elapsed:?}; budget is 30 s"
    );
    // Sanity-touch chrono to silence dead_code on the import; the wallclock
    // dates inside the bundle are validated by the bundle schema's
    // `format: date-time` constraint.
    let _ = Utc.with_ymd_and_hms(2026, 5, 19, 12, 0, 0).unwrap();
}