thread-flow 0.1.0

// SPDX-FileCopyrightText: 2025 Knitli Inc. <knitli@knit.li>
// SPDX-FileCopyrightText: 2026 Knitli Inc.
//
// SPDX-License-Identifier: AGPL-3.0-or-later

//! Infrastructure tests for service bridge and runtime management
//!
//! This test suite validates:
//! - CocoIndexAnalyzer bridge trait implementation structure
//! - RuntimeStrategy pattern for Local vs Edge environments
//! - Runtime task spawning and execution
//! - Future functionality placeholders (marked with #[ignore])
//!
//! ## Current Implementation Status
//!
//! Both `bridge.rs` and `runtime.rs` are architectural placeholders:
//!
//! ### bridge.rs
//! - ✅ Compiles and instantiates successfully
//! - ✅ Implements CodeAnalyzer trait with all required methods
//! - ⏳ All analysis methods return empty results (TODO: integrate with ReCoco)
//! - ⏳ Generic over Doc type - full testing requires concrete document types
//!
//! ### runtime.rs
//! - ✅ RuntimeStrategy trait defines environment abstraction
//! - ✅ LocalStrategy and EdgeStrategy implementations
//! - ✅ Both strategies execute futures successfully via tokio::spawn
//! - ⏳ Edge differentiation (Cloudflare-specific spawning) TODO
//!
//! ## Test Coverage Strategy
//!
//! 1. **Structural Tests**: Verify instantiation and trait implementation
//! 2. **Runtime Tests**: Validate task spawning and execution patterns
//! 3. **Integration Tests**: Test strategy pattern with concurrent operations
//! 4. **Future Tests**: Marked #[ignore] for when implementations complete
//!
//! ## Coverage Limitations
//!
//! - **Bridge API Testing**: CodeAnalyzer<D> is generic, full testing requires:
//!   * Concrete Doc type instantiation
//!   * ParsedDocument creation with Root<D>, fingerprint, etc.
//!   * Integration with ReCoco dataflow
//! - **Current Focus**: Test what's implementable now (runtime strategies)
//! - **Future Work**: Enable ignored tests when bridge integration is complete

use std::sync::Arc;
use thread_flow::bridge::CocoIndexAnalyzer;
use thread_flow::runtime::{EdgeStrategy, LocalStrategy, RuntimeStrategy};
use tokio::time::{Duration, sleep, timeout};

// ============================================================================
// Bridge Tests - CocoIndexAnalyzer
// ============================================================================

#[test]
fn test_analyzer_instantiation() {
    // Test basic construction succeeds
    let _analyzer = CocoIndexAnalyzer::new();

    // Verify it's a zero-sized type (no runtime overhead)
    assert_eq!(
        std::mem::size_of::<CocoIndexAnalyzer>(),
        0,
        "CocoIndexAnalyzer should be zero-sized until internal state added"
    );
}

#[test]
#[ignore = "CodeAnalyzer trait requires type parameter - capabilities() needs Doc type"]
fn test_analyzer_capabilities_reporting() {
    // NOTE: This test is disabled because CodeAnalyzer<D> is generic over Doc type
    // and capabilities() is only accessible with a concrete type parameter.
    // When the bridge implementation is complete, this should be refactored to
    // use a concrete document type or test through the actual API.

    // Future test structure:
    // let analyzer = CocoIndexAnalyzer::new();
    // let caps = CodeAnalyzer::<SomeConcreteDocType>::capabilities(&analyzer);
    // assert_eq!(caps.max_concurrent_patterns, Some(50));
}

#[tokio::test]
#[ignore = "Requires ParsedDocument creation with Root<D> and fingerprint"]
async fn test_analyzer_find_pattern_stub() {
    // This test validates the stub behavior of find_pattern
    // Currently disabled because it requires:
    // - Creating a Root<D> from AST parsing
    // - Generating content fingerprint
    // - Creating ParsedDocument with proper parameters
    //
    // Enable when bridge integration provides helper methods or
    // when testing through the full ReCoco pipeline.
}

#[tokio::test]
#[ignore = "Requires ParsedDocument creation with Root<D> and fingerprint"]
async fn test_analyzer_find_all_patterns_stub() {
    // Validates stub behavior of find_all_patterns
    // Requires same infrastructure as test_analyzer_find_pattern_stub
}

#[tokio::test]
#[ignore = "Requires ParsedDocument creation with Root<D> and fingerprint"]
async fn test_analyzer_replace_pattern_stub() {
    // Validates stub behavior of replace_pattern
    // Requires same infrastructure as test_analyzer_find_pattern_stub
}

#[tokio::test]
#[ignore = "Requires ParsedDocument creation with Root<D> and fingerprint"]
async fn test_analyzer_cross_file_relationships_stub() {
    // Validates stub behavior of analyze_cross_file_relationships
    // Requires same infrastructure as test_analyzer_find_pattern_stub
}

// ============================================================================
// Runtime Strategy Tests - LocalStrategy
// ============================================================================

#[test]
fn test_local_strategy_instantiation() {
    let _strategy = LocalStrategy;

    // LocalStrategy is zero-sized
    assert_eq!(
        std::mem::size_of::<LocalStrategy>(),
        0,
        "LocalStrategy should be zero-sized"
    );
}

#[tokio::test]
async fn test_local_strategy_spawn_executes_future() {
    let strategy = LocalStrategy;
    let (tx, rx) = tokio::sync::oneshot::channel();

    // Spawn a future that sends a message
    strategy.spawn(async move {
        tx.send(42).expect("Should send message");
    });

    // Verify the spawned task executed
    let result = timeout(Duration::from_secs(1), rx).await;
    assert!(
        result.is_ok(),
        "Spawned task should complete within timeout"
    );
    assert_eq!(result.unwrap().unwrap(), 42);
}

#[tokio::test]
async fn test_local_strategy_spawn_multiple_futures() {
    let strategy = LocalStrategy;
    let counter = Arc::new(tokio::sync::Mutex::new(0));

    // Spawn multiple futures concurrently
    for _ in 0..10 {
        let counter = Arc::clone(&counter);
        strategy.spawn(async move {
            let mut count = counter.lock().await;
            *count += 1;
        });
    }

    // Wait for all spawned tasks to complete
    sleep(Duration::from_millis(100)).await;

    let final_count = *counter.lock().await;
    assert_eq!(final_count, 10, "All spawned tasks should execute");
}

#[tokio::test]
async fn test_local_strategy_spawn_handles_panic() {
    let strategy = LocalStrategy;

    // Spawning a future that panics should not crash the test
    strategy.spawn(async {
        panic!("This panic should be isolated in the spawned task");
    });

    // The main task continues unaffected
    sleep(Duration::from_millis(50)).await;
    // Test completes successfully if we reach here
}

#[tokio::test]
async fn test_local_strategy_concurrent_spawns() {
    let strategy = LocalStrategy;
    let results = Arc::new(tokio::sync::Mutex::new(Vec::new()));

    // Spawn many tasks concurrently and collect results
    for i in 0..50 {
        let results = Arc::clone(&results);
        strategy.spawn(async move {
            // Simulate some async work
            sleep(Duration::from_millis(10)).await;
            results.lock().await.push(i);
        });
    }

    // Wait for all tasks to complete
    sleep(Duration::from_millis(200)).await;

    let final_results = results.lock().await;
    assert_eq!(
        final_results.len(),
        50,
        "All 50 concurrent tasks should complete"
    );
}

// ============================================================================
// Runtime Strategy Tests - EdgeStrategy
// ============================================================================

#[test]
fn test_edge_strategy_instantiation() {
    let _strategy = EdgeStrategy;

    // EdgeStrategy is zero-sized
    assert_eq!(
        std::mem::size_of::<EdgeStrategy>(),
        0,
        "EdgeStrategy should be zero-sized"
    );
}

#[tokio::test]
async fn test_edge_strategy_spawn_executes_future() {
    let strategy = EdgeStrategy;
    let (tx, rx) = tokio::sync::oneshot::channel();

    // Spawn a future that sends a message
    strategy.spawn(async move {
        tx.send(42).expect("Should send message");
    });

    // Verify the spawned task executed
    let result = timeout(Duration::from_secs(1), rx).await;
    assert!(
        result.is_ok(),
        "Spawned task should complete within timeout"
    );
    assert_eq!(result.unwrap().unwrap(), 42);
}

#[tokio::test]
async fn test_edge_strategy_spawn_multiple_futures() {
    let strategy = EdgeStrategy;
    let counter = Arc::new(tokio::sync::Mutex::new(0));

    // Spawn multiple futures concurrently
    for _ in 0..10 {
        let counter = Arc::clone(&counter);
        strategy.spawn(async move {
            let mut count = counter.lock().await;
            *count += 1;
        });
    }

    // Wait for all spawned tasks to complete
    sleep(Duration::from_millis(100)).await;

    let final_count = *counter.lock().await;
    assert_eq!(final_count, 10, "All spawned tasks should execute");
}

#[tokio::test]
async fn test_edge_strategy_spawn_handles_panic() {
    let strategy = EdgeStrategy;

    // Spawning a future that panics should not crash the test
    strategy.spawn(async {
        panic!("This panic should be isolated in the spawned task");
    });

    // The main task continues unaffected
    sleep(Duration::from_millis(50)).await;
    // Test completes successfully if we reach here
}

#[tokio::test]
async fn test_edge_strategy_concurrent_spawns() {
    let strategy = EdgeStrategy;
    let results = Arc::new(tokio::sync::Mutex::new(Vec::new()));

    // Spawn many tasks concurrently and collect results
    for i in 0..50 {
        let results = Arc::clone(&results);
        strategy.spawn(async move {
            // Simulate some async work
            sleep(Duration::from_millis(10)).await;
            results.lock().await.push(i);
        });
    }

    // Wait for all tasks to complete
    sleep(Duration::from_millis(200)).await;

    let final_results = results.lock().await;
    assert_eq!(
        final_results.len(),
        50,
        "All 50 concurrent tasks should complete"
    );
}

// ============================================================================
// Runtime Strategy Tests - Trait Abstraction
// ============================================================================

// NOTE: RuntimeStrategy is NOT dyn-compatible because spawn() is generic.
// Cannot use trait objects (Box<dyn RuntimeStrategy>) with this trait.
// Tests must use concrete types directly.

#[tokio::test]
async fn test_runtime_strategies_are_equivalent_currently() {
    // Both LocalStrategy and EdgeStrategy currently use tokio::spawn
    // This test verifies they behave identically (for now)
    // When Edge differentiation is implemented, this test should be updated

    let local = LocalStrategy;
    let edge = EdgeStrategy;

    let (local_tx, local_rx) = tokio::sync::oneshot::channel();
    let (edge_tx, edge_rx) = tokio::sync::oneshot::channel();

    // Spawn identical tasks with both strategies
    local.spawn(async move {
        sleep(Duration::from_millis(10)).await;
        local_tx.send("done").unwrap();
    });

    edge.spawn(async move {
        sleep(Duration::from_millis(10)).await;
        edge_tx.send("done").unwrap();
    });

    // Both should complete successfully
    let local_result = timeout(Duration::from_secs(1), local_rx).await;
    let edge_result = timeout(Duration::from_secs(1), edge_rx).await;

    assert!(local_result.is_ok(), "Local strategy should complete");
    assert!(edge_result.is_ok(), "Edge strategy should complete");
    assert_eq!(local_result.unwrap().unwrap(), "done");
    assert_eq!(edge_result.unwrap().unwrap(), "done");
}

#[tokio::test]
async fn test_strategy_spawn_with_complex_futures() {
    let strategy = LocalStrategy;

    // Test spawning a complex future with nested async operations
    let (tx, rx) = tokio::sync::oneshot::channel();

    strategy.spawn(async move {
        // Simulate complex async work
        let mut sum = 0;
        for i in 0..10 {
            sleep(Duration::from_millis(1)).await;
            sum += i;
        }
        tx.send(sum).unwrap();
    });

    let result = timeout(Duration::from_secs(1), rx).await;
    assert!(result.is_ok(), "Complex future should complete");
    assert_eq!(result.unwrap().unwrap(), 45); // Sum of 0..10
}

// ============================================================================
// Integration Tests - Strategy Pattern Usage
// ============================================================================

#[test]
fn test_strategy_selection_pattern() {
    // Since RuntimeStrategy is not dyn-compatible, use an enum instead
    enum Strategy {
        Local(LocalStrategy),
        Edge(EdgeStrategy),
    }

    fn select_strategy(is_edge: bool) -> Strategy {
        if is_edge {
            Strategy::Edge(EdgeStrategy)
        } else {
            Strategy::Local(LocalStrategy)
        }
    }

    // Verify selection logic works correctly
    matches!(select_strategy(false), Strategy::Local(_));
    matches!(select_strategy(true), Strategy::Edge(_));
}

// ============================================================================
// Future Tests - Currently Ignored
// ============================================================================

#[ignore = "TODO: Enable when ReCoco integration is complete"]
#[tokio::test]
async fn test_analyzer_actual_pattern_matching() {
    // This test should be enabled once find_pattern integrates with ReCoco
    // and proper document creation helpers are available
    //
    // Expected behavior:
    // - Create a ParsedDocument from source code
    // - Use analyzer to find patterns (e.g., function declarations)
    // - Verify matches are returned with correct positions and metadata
    // - Test pattern capture variables ($NAME, $$$PARAMS, etc.)
}

#[ignore = "TODO: Enable when ReCoco integration is complete"]
#[tokio::test]
async fn test_analyzer_actual_replacement() {
    // This test validates actual code replacement functionality
    //
    // Expected behavior:
    // - Create a mutable ParsedDocument
    // - Apply pattern-based replacements
    // - Verify replacement count and document modification
    // - Test replacement templates with captured variables
}

#[ignore = "TODO: Enable when ReCoco graph querying is implemented"]
#[tokio::test]
async fn test_analyzer_cross_file_import_relationships() {
    // This test validates cross-file relationship discovery
    //
    // Expected behavior:
    // - Create multiple ParsedDocuments with import relationships
    // - Query analyzer for cross-file relationships
    // - Verify import/export relationships are detected
    // - Test relationship directionality and metadata
}

#[ignore = "TODO: Enable when Edge differentiation is implemented"]
#[tokio::test]
async fn test_edge_strategy_uses_cloudflare_runtime() {
    // When EdgeStrategy is fully implemented for Cloudflare Workers,
    // it should use the Workers runtime instead of tokio::spawn
    //
    // Expected differences:
    // - Different spawning mechanism (Workers-specific API)
    // - Different concurrency limits
    // - Different scheduling behavior
    // - Integration with Workers environment features
}

#[ignore = "TODO: Enable when runtime abstraction expands"]
#[tokio::test]
async fn test_runtime_strategy_storage_abstraction() {
    // Future enhancement: RuntimeStrategy should abstract storage backends
    //
    // Expected behavior:
    // - LocalStrategy -> Postgres connection
    // - EdgeStrategy -> D1 (Cloudflare) connection
    // - Storage methods return appropriate backend types
    // - Test storage operations through strategy interface
}

#[ignore = "TODO: Enable when runtime abstraction expands"]
#[tokio::test]
async fn test_runtime_strategy_config_abstraction() {
    // Future enhancement: RuntimeStrategy should provide environment config
    //
    // Expected behavior:
    // - LocalStrategy -> file-based configuration
    // - EdgeStrategy -> environment variable configuration
    // - Config methods return appropriate config sources
    // - Test configuration access through strategy interface
}

#[ignore = "TODO: Enable when capability enforcement is implemented"]
#[tokio::test]
async fn test_analyzer_respects_max_concurrent_patterns() {
    // Test that analyzer enforces max_concurrent_patterns limit (50)
    //
    // Expected behavior:
    // - Attempt to process 60 patterns simultaneously
    // - Analyzer should either batch them or return an error
    // - Verify no more than 50 patterns are processed concurrently
    // - Test error messages mention pattern limits
}

#[ignore = "TODO: Enable when capability enforcement is implemented"]
#[tokio::test]
async fn test_analyzer_respects_max_matches_per_pattern() {
    // Test that analyzer enforces max_matches_per_pattern limit (1000)
    //
    // Expected behavior:
    // - Create document with 2000 potential matches
    // - Analyzer should limit results to 1000
    // - Test truncation behavior and metadata
    // - Verify performance remains acceptable
}

#[ignore = "TODO: Enable when full integration is complete"]
#[tokio::test]
async fn test_end_to_end_analysis_pipeline() {
    // Complete integration test simulating real-world usage:
    //
    // 1. Initialize analyzer with ReCoco backend
    // 2. Select runtime strategy based on environment
    // 3. Perform analysis across multiple files
    // 4. Store results in appropriate backend (Postgres/D1)
    // 5. Retrieve and verify cached results
    // 6. Test incremental updates
    // 7. Verify cross-file relationship tracking
}

// ============================================================================
// Performance and Stress Tests
// ============================================================================

#[tokio::test]
async fn test_runtime_strategy_high_concurrency() {
    // Test strategy behavior under high concurrent load
    let strategy = LocalStrategy;
    let completed = Arc::new(tokio::sync::Mutex::new(0));

    // Spawn 1000 concurrent tasks
    for _ in 0..1000 {
        let completed = Arc::clone(&completed);
        strategy.spawn(async move {
            sleep(Duration::from_micros(100)).await;
            *completed.lock().await += 1;
        });
    }

    // Wait for completion with generous timeout
    sleep(Duration::from_secs(2)).await;

    let count = *completed.lock().await;
    assert!(
        count >= 900, // Allow some margin for timing issues
        "Most concurrent tasks should complete, got {}/1000",
        count
    );
}

#[tokio::test]
async fn test_runtime_strategy_spawn_speed() {
    // Verify spawning is fast enough for production use
    let strategy = LocalStrategy;
    let start = std::time::Instant::now();

    // Spawn 100 tasks
    for _ in 0..100 {
        strategy.spawn(async move {
            // Minimal work
        });
    }

    let elapsed = start.elapsed();

    // Should be able to spawn 100 tasks in well under a second
    assert!(
        elapsed < Duration::from_millis(100),
        "Spawning 100 tasks took {:?}, should be < 100ms",
        elapsed
    );
}