//! Integration Tests: Federated Cognitive Mesh
//!
//! These tests verify distributed substrate capabilities including:
//! - Post-quantum key exchange
//! - CRDT reconciliation
//! - Byzantine fault tolerant consensus
//! - Federated query routing

#[cfg(test)]
mod federation_tests {
    // Note: These imports will be available once crates are implemented
    // use exo_federation::{FederatedMesh, FederationScope, StateUpdate};
    // use exo_core::{Query, Pattern};

    /// Test: CRDT merge operations for conflict-free reconciliation
    ///
    /// Flow:
    /// 1. Create two federated nodes
    /// 2. Each node stores different patterns
    /// 3. Merge CRDT states
    /// 4. Verify both nodes have consistent view
    #[tokio::test]
    #[ignore] // Remove when exo-federation exists
    async fn test_crdt_merge_reconciliation() {
        // TODO: Implement once exo-federation exists

        // Expected API:
        // let node1 = FederatedMesh::new("node1").await.unwrap();
        // let node2 = FederatedMesh::new("node2").await.unwrap();
        //
        // // Node 1 stores pattern A
        // let pattern_a = Pattern { embedding: vec![1.0, 0.0], ... };
        // node1.store(pattern_a.clone()).await.unwrap();
        //
        // // Node 2 stores pattern B
        // let pattern_b = Pattern { embedding: vec![0.0, 1.0], ... };
        // node2.store(pattern_b.clone()).await.unwrap();
        //
        // // Export CRDT states
        // let state1 = node1.export_crdt_state().await.unwrap();
        // let state2 = node2.export_crdt_state().await.unwrap();
        //
        // // Merge states (commutative, associative, idempotent)
        // node1.merge_crdt_state(state2).await.unwrap();
        // node2.merge_crdt_state(state1).await.unwrap();
        //
        // // Verify convergence: both nodes have A and B
        // let results1 = node1.list_all_patterns().await.unwrap();
        // let results2 = node2.list_all_patterns().await.unwrap();
        //
        // assert_eq!(results1.len(), 2);
        // assert_eq!(results2.len(), 2);
        // assert_eq!(results1, results2); // Identical state

        panic!("Implement this test once exo-federation crate exists");
    }

    /// Test: Byzantine fault tolerant consensus
    ///
    /// Verifies consensus can tolerate f Byzantine faults for n=3f+1 nodes.
    #[tokio::test]
    #[ignore]
    async fn test_byzantine_consensus() {
        // TODO: Implement once exo-federation exists

        // Expected behavior:
        // - Create 4 nodes (tolerate 1 Byzantine fault)
        // - Propose state update
        // - Simulate 1 Byzantine node sending conflicting votes
        // - Verify honest majority reaches consensus

        // Expected API:
        // let nodes = create_federation(4).await;
        //
        // let update = StateUpdate { ... };
        //
        // // Honest nodes (0, 1, 2)
        // let votes = vec![
        //     nodes[0].vote_on_update(&update).await.unwrap(),
        //     nodes[1].vote_on_update(&update).await.unwrap(),
        //     nodes[2].vote_on_update(&update).await.unwrap(),
        // ];
        //
        // // Byzantine node sends conflicting vote
        // let byzantine_vote = create_conflicting_vote(&update);
        //
        // // Collect all votes
        // let all_votes = [votes, vec![byzantine_vote]].concat();
        //
        // // Verify consensus reached despite Byzantine node
        // let proof = nodes[0].finalize_consensus(&all_votes).await.unwrap();
        // assert!(proof.is_valid());

        panic!("Implement this test once exo-federation crate exists");
    }

    /// Test: Post-quantum key exchange and encrypted channel
    ///
    /// Verifies CRYSTALS-Kyber key exchange for federation handshake.
    #[tokio::test]
    #[ignore]
    async fn test_post_quantum_handshake() {
        // TODO: Implement once exo-federation exists

        // Expected API:
        // let node1 = FederatedMesh::new("node1").await.unwrap();
        // let node2 = FederatedMesh::new("node2").await.unwrap();
        //
        // // Node 1 initiates federation
        // let token = node1.join_federation(&node2.address()).await.unwrap();
        //
        // // Verify encrypted channel established
        // assert!(token.channel.is_encrypted());
        // assert_eq!(token.channel.crypto_algorithm(), "CRYSTALS-Kyber");
        //
        // // Send encrypted message
        // let message = "test message";
        // token.channel.send(message).await.unwrap();
        //
        // // Node 2 receives and decrypts
        // let received = node2.receive().await.unwrap();
        // assert_eq!(received, message);

        panic!("Implement this test once exo-federation crate exists");
    }

    /// Test: Federated query with onion routing
    ///
    /// Verifies privacy-preserving query routing across federation.
    #[tokio::test]
    #[ignore]
    async fn test_onion_routed_federated_query() {
        // TODO: Implement once exo-federation exists

        // Expected API:
        // let federation = create_federation(5).await;
        //
        // // Store pattern on node 4
        // let pattern = Pattern { ... };
        // federation.nodes[4].store(pattern.clone()).await.unwrap();
        //
        // // Node 0 queries through onion network
        // let query = Query::from_embedding(pattern.embedding.clone());
        // let scope = FederationScope::Full;
        // let results = federation.nodes[0].federated_query(&query, scope).await.unwrap();
        //
        // // Should find pattern without revealing query origin
        // assert_eq!(results.len(), 1);
        // assert_eq!(results[0].pattern.id, pattern.id);
        //
        // // Verify intermediate nodes don't know query origin
        // // (This would require instrumentation/logging)

        panic!("Implement this test once exo-federation crate exists");
    }

    /// Test: CRDT concurrent updates
    ///
    /// Verifies CRDTs handle concurrent conflicting updates correctly.
    #[tokio::test]
    #[ignore]
    async fn test_crdt_concurrent_updates() {
        // TODO: Implement once exo-federation exists

        // Scenario:
        // - Two nodes concurrently update same pattern
        // - Verify CRDT reconciliation produces consistent result
        // - Test all CRDT types: G-Set, LWW-Register, Counter

        panic!("Implement this test once exo-federation crate exists");
    }

    /// Test: Federation with partial connectivity
    ///
    /// Verifies system handles network partitions gracefully.
    #[tokio::test]
    #[ignore]
    async fn test_network_partition_tolerance() {
        // TODO: Implement once exo-federation exists

        // Expected:
        // - Create 6-node federation
        // - Partition into two groups (3 + 3)
        // - Verify each partition continues operation
        // - Heal partition
        // - Verify eventual consistency after healing

        panic!("Implement this test once exo-federation crate exists");
    }

    /// Test: Consensus timeout and retry
    ///
    /// Verifies consensus protocol handles slow/unresponsive nodes.
    #[tokio::test]
    #[ignore]
    async fn test_consensus_timeout_handling() {
        // TODO: Implement once exo-federation exists

        // Expected:
        // - Create federation with one slow node
        // - Propose update with timeout
        // - Verify consensus either succeeds without slow node or retries

        panic!("Implement this test once exo-federation crate exists");
    }

    /// Test: Federated query aggregation
    ///
    /// Verifies query results are correctly aggregated from multiple nodes.
    #[tokio::test]
    #[ignore]
    async fn test_federated_query_aggregation() {
        // TODO: Implement once exo-federation exists

        // Expected:
        // - Multiple nodes store different patterns
        // - Query aggregates top-k results from all nodes
        // - Verify ranking is correct across federation

        panic!("Implement this test once exo-federation crate exists");
    }

    /// Test: Cryptographic sovereignty boundaries
    ///
    /// Verifies federation respects cryptographic access control.
    #[tokio::test]
    #[ignore]
    async fn test_cryptographic_sovereignty() {
        // TODO: Implement once exo-federation exists

        // Expected:
        // - Node stores pattern with access control
        // - Unauthorized node attempts query
        // - Verify access denied
        // - Authorized node with correct key succeeds

        panic!("Implement this test once exo-federation crate exists");
    }

    // Helper function to create test federation
    #[allow(dead_code)]
    async fn create_federation(_node_count: usize) {
        // TODO: Implement helper to build test federation
        panic!("Helper not implemented yet");
    }
}