use std::time::Instant;

fn make_test_engine() -> (leankg::graph::GraphEngine, tempfile::TempDir) {
    let tmp = tempfile::tempdir().unwrap();
    let db_path = tmp.path().join("stress.db");
    let db = leankg::db::schema::init_db(&db_path).unwrap();
    let engine = leankg::graph::GraphEngine::new(db);
    (engine, tmp)
}

fn insert_functions(engine: &leankg::graph::GraphEngine, count: usize) {
    let elements: Vec<leankg::db::models::CodeElement> = (0..count)
        .map(|i| leankg::db::models::CodeElement {
            qualified_name: format!("src/mod{}::fn_{}", i / 100, i),
            element_type: "function".to_string(),
            name: format!("fn_{}", i),
            file_path: format!("src/mod{}.rs", i / 100),
            line_start: 1,
            line_end: 10,
            language: "rust".to_string(),
            ..Default::default()
        })
        .collect();

    for chunk in elements.chunks(1000) {
        engine.insert_elements(chunk).unwrap();
    }
}

fn insert_unresolved_calls(engine: &leankg::graph::GraphEngine, count: usize) -> Vec<String> {
    let mut sources = Vec::new();
    let mut relationships = Vec::new();

    for i in 0..count {
        let source = format!("src/mod{}::caller_{}", i / 100, i);
        sources.push(source.clone());
        relationships.push(leankg::db::models::Relationship {
            id: None,
            source_qualified: source,
            target_qualified: format!("__unresolved__fn_{}", i % 1000),
            rel_type: "calls".to_string(),
            confidence: 0.5,
            metadata: serde_json::json!({}),
            ..Default::default()
        });
    }

    for chunk in relationships.chunks(1000) {
        engine.insert_relationships(chunk).unwrap();
    }

    sources
}

#[test]
fn test_batch_delete_1m_edges() {
    let (engine, _tmp) = make_test_engine();

    let num_functions = 1000;
    let num_edges = 1_000_000;

    println!("\n=== Batch Delete Stress Test: {} edges ===", num_edges);

    let t0 = Instant::now();
    insert_functions(&engine, num_functions);
    println!(
        "Inserted {} functions in {:.2}s",
        num_functions,
        t0.elapsed().as_secs_f64()
    );

    let t1 = Instant::now();
    insert_unresolved_calls(&engine, num_edges);
    println!(
        "Inserted {} unresolved calls in {:.2}s",
        num_edges,
        t1.elapsed().as_secs_f64()
    );

    let t2 = Instant::now();
    let resolved = engine.resolve_call_edges().unwrap();
    let resolve_time = t2.elapsed().as_secs_f64();
    println!("Resolved {} call edges in {:.3}s", resolved, resolve_time);

    assert_eq!(resolved, num_edges, "All edges should be resolved");
    assert!(
        resolve_time < 120.0,
        "Resolve should complete in <120s for 1M edges, took {:.3}s",
        resolve_time
    );

    println!("=== PASS ===\n");
}

#[test]
fn test_batch_delete_10k_edges() {
    let (engine, _tmp) = make_test_engine();

    let num_functions = 500;
    let num_edges = 10_000;

    println!("\n=== Batch Delete Test: {} edges ===", num_edges);

    insert_functions(&engine, num_functions);
    insert_unresolved_calls(&engine, num_edges);

    let t = Instant::now();
    let resolved = engine.resolve_call_edges().unwrap();
    let elapsed = t.elapsed().as_secs_f64();

    println!("Resolved {} call edges in {:.3}s", resolved, elapsed);

    assert_eq!(resolved, num_edges);
    assert!(
        elapsed < 5.0,
        "10K edges should resolve in <5s, took {:.3}s",
        elapsed
    );

    println!("=== PASS ===\n");
}
