//! Full Integration Tests for RuVector Graph Package
//!
//! This test suite validates:
//! - End-to-end functionality across all graph components
//! - Cross-package integration (graph + vector)
//! - CLI command execution
//! - Performance benchmarks vs targets
//! - Neo4j compatibility

use std::path::PathBuf;
use std::time::Instant;

// Note: This integration test file will use the graph APIs once they are exposed
// For now, it serves as a template for comprehensive testing

#[test]
fn test_graph_package_exists() {
    // Verify the graph package can be imported
    // This is a basic sanity check
    let manifest_dir = env!("CARGO_MANIFEST_DIR");
    let graph_path = PathBuf::from(manifest_dir).join("crates/ruvector-graph");
    assert!(graph_path.exists(), "ruvector-graph package should exist");
}

#[test]
fn test_graph_node_package_exists() {
    let manifest_dir = env!("CARGO_MANIFEST_DIR");
    let graph_node_path = PathBuf::from(manifest_dir).join("crates/ruvector-graph-node");
    assert!(graph_node_path.exists(), "ruvector-graph-node package should exist");
}

#[test]
fn test_graph_wasm_package_exists() {
    let manifest_dir = env!("CARGO_MANIFEST_DIR");
    let graph_wasm_path = PathBuf::from(manifest_dir).join("crates/ruvector-graph-wasm");
    assert!(graph_wasm_path.exists(), "ruvector-graph-wasm package should exist");
}

#[cfg(test)]
mod integration_tests {
    use super::*;

    /// Test basic graph operations
    #[test]
    fn test_basic_graph_operations() {
        // TODO: Once the graph API is exposed, test:
        // 1. Create graph database
        // 2. Add nodes with labels
        // 3. Create relationships
        // 4. Query nodes and relationships
        // 5. Update properties
        // 6. Delete nodes and relationships

        println!("Basic graph operations test - ready for implementation");
    }

    /// Test Cypher query parsing and execution
    #[test]
    fn test_cypher_queries() {
        // TODO: Test Cypher queries:
        // 1. CREATE queries
        // 2. MATCH queries
        // 3. WHERE clauses
        // 4. RETURN projections
        // 5. Aggregations (COUNT, SUM, etc.)
        // 6. ORDER BY and LIMIT

        println!("Cypher query test - ready for implementation");
    }

    /// Test hybrid vector-graph search
    #[test]
    fn test_hybrid_search() {
        // TODO: Test hybrid search:
        // 1. Create nodes with vector embeddings
        // 2. Perform vector similarity search
        // 3. Combine with graph traversal
        // 4. Filter by graph structure
        // 5. Rank results by relevance

        println!("Hybrid search test - ready for implementation");
    }

    /// Test distributed graph operations
    #[test]
    #[cfg(feature = "distributed")]
    fn test_distributed_cluster() {
        // TODO: Test distributed features:
        // 1. Initialize cluster with multiple nodes
        // 2. Distribute graph data via sharding
        // 3. Test RAFT consensus
        // 4. Verify data replication
        // 5. Test failover scenarios

        println!("Distributed cluster test - ready for implementation");
    }

    /// Test performance benchmarks
    #[test]
    fn test_performance_targets() {
        // Performance targets:
        // - Node insertion: >100k nodes/sec
        // - Relationship creation: >50k edges/sec
        // - Simple traversal: <1ms for depth-3
        // - Vector search: <10ms for 1M vectors
        // - Cypher query: <100ms for complex patterns

        let start = Instant::now();

        // TODO: Run actual performance tests

        let duration = start.elapsed();
        println!("Performance test completed in {:?}", duration);

        // Assert performance targets are met
        assert!(duration.as_millis() < 5000, "Performance test should complete quickly");
    }

    /// Test Neo4j compatibility
    #[test]
    fn test_neo4j_compatibility() {
        // TODO: Verify Neo4j compatibility:
        // 1. Bolt protocol support
        // 2. Cypher query compatibility
        // 3. Property graph model
        // 4. Transaction semantics
        // 5. Index types (btree, fulltext)

        println!("Neo4j compatibility test - ready for implementation");
    }

    /// Test cross-package integration with vector store
    #[test]
    fn test_vector_graph_integration() {
        // TODO: Test integration between vector and graph:
        // 1. Create vector database
        // 2. Create graph database
        // 3. Link vectors to graph nodes
        // 4. Perform combined queries
        // 5. Update both stores atomically

        println!("Vector-graph integration test - ready for implementation");
    }

    /// Test CLI commands
    #[test]
    fn test_cli_commands() {
        // TODO: Test CLI functionality:
        // 1. cargo run -p ruvector-cli graph create
        // 2. cargo run -p ruvector-cli graph query
        // 3. cargo run -p ruvector-cli graph export
        // 4. cargo run -p ruvector-cli graph import
        // 5. cargo run -p ruvector-cli graph stats

        println!("CLI commands test - ready for implementation");
    }

    /// Test data persistence and recovery
    #[test]
    fn test_persistence_recovery() {
        // TODO: Test persistence:
        // 1. Create graph with data
        // 2. Close database
        // 3. Reopen database
        // 4. Verify data integrity
        // 5. Test crash recovery

        println!("Persistence and recovery test - ready for implementation");
    }

    /// Test concurrent operations
    #[test]
    fn test_concurrent_operations() {
        // TODO: Test concurrency:
        // 1. Multiple threads reading
        // 2. Multiple threads writing
        // 3. Read-write concurrency
        // 4. Transaction isolation
        // 5. Lock contention handling

        println!("Concurrent operations test - ready for implementation");
    }

    /// Test memory usage and limits
    #[test]
    fn test_memory_limits() {
        // TODO: Test memory constraints:
        // 1. Large graph creation (millions of nodes)
        // 2. Memory-mapped storage efficiency
        // 3. Cache eviction policies
        // 4. Memory leak detection

        println!("Memory limits test - ready for implementation");
    }

    /// Test error handling
    #[test]
    fn test_error_handling() {
        // TODO: Test error scenarios:
        // 1. Invalid Cypher syntax
        // 2. Non-existent nodes/relationships
        // 3. Constraint violations
        // 4. Disk space errors
        // 5. Network failures (distributed mode)

        println!("Error handling test - ready for implementation");
    }
}

#[cfg(test)]
mod compatibility_tests {
    /// Test Neo4j Bolt protocol compatibility
    #[test]
    fn test_bolt_protocol() {
        // TODO: Implement Bolt protocol tests
        println!("Bolt protocol compatibility test - ready for implementation");
    }

    /// Test Cypher query language compatibility
    #[test]
    fn test_cypher_compatibility() {
        // TODO: Test standard Cypher queries
        println!("Cypher compatibility test - ready for implementation");
    }

    /// Test property graph model
    #[test]
    fn test_property_graph_model() {
        // TODO: Verify property graph semantics
        println!("Property graph model test - ready for implementation");
    }
}

#[cfg(test)]
mod benchmark_tests {
    use super::*;

    /// Benchmark node insertion rate
    #[test]
    fn bench_node_insertion() {
        let target_rate = 100_000; // nodes per second
        println!("Target: {} nodes/sec", target_rate);
        // TODO: Implement benchmark
    }

    /// Benchmark relationship creation rate
    #[test]
    fn bench_relationship_creation() {
        let target_rate = 50_000; // edges per second
        println!("Target: {} edges/sec", target_rate);
        // TODO: Implement benchmark
    }

    /// Benchmark traversal performance
    #[test]
    fn bench_traversal() {
        let target_latency_ms = 1; // milliseconds for depth-3
        println!("Target: <{}ms for depth-3 traversal", target_latency_ms);
        // TODO: Implement benchmark
    }

    /// Benchmark vector search integration
    #[test]
    fn bench_vector_search() {
        let target_latency_ms = 10; // milliseconds for 1M vectors
        println!("Target: <{}ms for 1M vector search", target_latency_ms);
        // TODO: Implement benchmark
    }
}