// Integration tests for the onboarding backfill migration.
//
// Requires MongoDB (set TEST_MONGODB_URI if not at the default).
// Not run in CI (which is `--lib` only) — run locally:
//   cargo test -p compliance-agent --test e2e migration

use compliance_agent::database::{Database, DatabasePool};
use compliance_agent::migrate::onboarding;
use compliance_core::models::{
    ArtifactKind, DastTarget, DastTargetType, TargetType, TrackedRepository,
};
use mongodb::bson::{doc, Document};

async fn fresh_db() -> (DatabasePool, String, Database) {
    let uri = std::env::var("TEST_MONGODB_URI")
        .unwrap_or_else(|_| "mongodb://root:example@localhost:27017/?authSource=admin".into());
    // Prefix must fit the pool's 30-char cap (`<prefix>_<32 hex>` <= 63).
    let prefix = format!("t_{}", &uuid::Uuid::new_v4().simple().to_string()[..16]);
    let pool = DatabasePool::connect(&uri, &prefix)
        .await
        .expect("connect mongo");
    let db = pool.for_tenant_id("t1").await.expect("tenant db");
    (pool, prefix, db)
}

async fn cleanup(pool: &DatabasePool, prefix: &str) {
    if let Ok(names) = pool.client().list_database_names().await {
        for n in names {
            if n.starts_with(prefix) {
                pool.client().database(&n).drop().await.ok();
            }
        }
    }
}

#[tokio::test]
async fn backfill_folds_relinks_is_idempotent_and_reversible() {
    let (pool, prefix, db) = fresh_db().await;

    // Seed a repo.
    let repo = TrackedRepository::new("acme".into(), "https://git/acme.git".into());
    let repo_id = db
        .repositories()
        .insert_one(repo)
        .await
        .expect("insert repo")
        .inserted_id
        .as_object_id()
        .expect("repo oid");

    // A DAST target linked to the repo (folds + promotes to WebApp + relinks).
    let mut linked = DastTarget::new(
        "acme-web".into(),
        "https://acme.example.com".into(),
        DastTargetType::WebApp,
    );
    linked.repo_id = Some(repo_id.to_hex());
    let linked_id = db
        .dast_targets()
        .insert_one(linked)
        .await
        .expect("insert linked dast")
        .inserted_id
        .as_object_id()
        .expect("linked oid");

    // A repo-less DAST target (standalone).
    let standalone = DastTarget::new(
        "acme-api".into(),
        "https://api.acme.com".into(),
        DastTargetType::RestApi,
    );
    let standalone_id = db
        .dast_targets()
        .insert_one(standalone)
        .await
        .expect("insert standalone dast")
        .inserted_id
        .as_object_id()
        .expect("standalone oid");

    // A DAST scan run pointing at the linked target — should be relinked to the repo.
    db.collection_named::<Document>("dast_scan_runs")
        .insert_one(doc! { "target_id": linked_id.to_hex(), "status": "completed" })
        .await
        .expect("insert dast run");

    // --- Backfill ---
    assert!(!onboarding::already_applied(&db).await.unwrap());
    let report = onboarding::backfill_onboarded_targets(&db, false)
        .await
        .expect("backfill");
    assert_eq!(report.repos_migrated, 1);
    assert_eq!(report.dast_targets_folded, 1);
    assert_eq!(report.dast_targets_standalone, 1);
    assert!(onboarding::already_applied(&db).await.unwrap());

    // Repo target: preserved _id, has git + folded live-url, promoted to WebApp.
    let repo_target = db
        .onboarded_targets()
        .find_one(doc! { "_id": repo_id })
        .await
        .unwrap()
        .expect("repo target");
    assert!(repo_target.has(ArtifactKind::GitRepo));
    assert!(repo_target.has(ArtifactKind::LiveUrl));
    assert_eq!(repo_target.target_type, TargetType::WebApp);

    // Standalone target: preserved _id, live-url, backend service.
    let standalone_target = db
        .onboarded_targets()
        .find_one(doc! { "_id": standalone_id })
        .await
        .unwrap()
        .expect("standalone target");
    assert!(standalone_target.has(ArtifactKind::LiveUrl));
    assert_eq!(standalone_target.target_type, TargetType::BackendService);

    // The DAST run was relinked from the old dast id to the repo (unified) id.
    let run = db
        .collection_named::<Document>("dast_scan_runs")
        .find_one(doc! {})
        .await
        .unwrap()
        .expect("run");
    assert_eq!(run.get_str("target_id").unwrap(), repo_id.to_hex());

    // --- Idempotent: re-run migrates nothing new ---
    let again = onboarding::backfill_onboarded_targets(&db, false)
        .await
        .expect("backfill again");
    assert_eq!(again.repos_migrated, 0);
    assert_eq!(again.dast_targets_folded, 0);
    assert_eq!(again.dast_targets_standalone, 0);
    assert!(again.skipped_existing >= 2);

    // --- Revert: onboarded targets gone, relink undone, marker cleared ---
    onboarding::revert(&db).await.expect("revert");
    assert_eq!(
        db.onboarded_targets()
            .count_documents(doc! {})
            .await
            .unwrap(),
        0
    );
    let run_after = db
        .collection_named::<Document>("dast_scan_runs")
        .find_one(doc! {})
        .await
        .unwrap()
        .expect("run");
    assert_eq!(run_after.get_str("target_id").unwrap(), linked_id.to_hex());
    assert!(!onboarding::already_applied(&db).await.unwrap());

    cleanup(&pool, &prefix).await;
}