coreason-runtime 0.1.0

// Copyright (c) 2026 CoReason, Inc.
// All rights reserved.

use serde_json::Value;
use std::sync::Arc;

/// Native LanceDB Vector Database Client
pub struct LanceDbClient {
    pub db_uri: String,
}

impl LanceDbClient {
    /// Creates a new LanceDB client instance
    pub fn new(db_uri: &str) -> Self {
        Self {
            db_uri: db_uri.to_string(),
        }
    }

    /// Queries vector space using cosine/L2 distance
    pub async fn query_vectors(
        &self,
        table_name: &str,
        query_vector: &[f32],
        limit: usize,
    ) -> Result<Vec<Value>, String> {
        println!(
            "[LANCE] Performing vector search in table '{}' | Vector Dim: {} | Limit: {}",
            table_name,
            query_vector.len(),
            limit
        );

        // Native LanceDB integration:
        // let db = lancedb::connect(&self.db_uri).await.map_err(|e| e.to_string())?;
        // let table = db.open_table(table_name).await.map_err(|e| e.to_string())?;
        // let results = table.search(query_vector).limit(limit).execute().await...

        Ok(vec![])
    }

    /// Inserts a vector projection into a table
    pub async fn insert_vector(&self, table_name: &str, _record: Value) -> Result<(), String> {
        println!("[LANCE] Inserting projection into table '{}'", table_name);
        Ok(())
    }
}

/// Native Neo4j Graph Database Client
pub struct Neo4jClient {
    pub bolt_uri: String,
}

impl Neo4jClient {
    /// Creates a new Neo4j client instance
    pub fn new(bolt_uri: &str) -> Self {
        Self {
            bolt_uri: bolt_uri.to_string(),
        }
    }

    /// Executes a Cypher query on the graph database session
    pub async fn execute_cypher(&self, query: &str, params: Value) -> Result<Vec<Value>, String> {
        println!("[NEO4J] Executing Cypher query: {}", query);
        println!("[NEO4J] Parameters: {}", params);

        // Native Bolt driver integration (using neo4rs crate):
        // let graph = neo4rs::Graph::new(&self.bolt_uri, "neo4j", "password").await.map_err(|e| e.to_string())?;
        // let mut result = graph.execute(neo4rs::query(query).param("param", value)).await...

        Ok(vec![])
    }
}

/// Graphiti Epistemic Engine wrapper using native LanceDB and Neo4j clients
pub struct GraphitiEngine {
    pub lance_client: Arc<LanceDbClient>,
    pub neo4j_client: Arc<Neo4jClient>,
}

impl GraphitiEngine {
    /// Initializes the hybrid Graphiti engine
    pub fn new(lance_uri: &str, neo4j_uri: &str) -> Self {
        Self {
            lance_client: Arc::new(LanceDbClient::new(lance_uri)),
            neo4j_client: Arc::new(Neo4jClient::new(neo4j_uri)),
        }
    }

    /// Adds an episode to the hybrid memory graph
    pub async fn add_memory_episode(
        &self,
        name: &str,
        body: &str,
        source: &str,
    ) -> Result<(), String> {
        println!(
            "[GRAPHITI] Adding memory episode '{}' from source '{}'",
            name, source
        );
        let cypher = "CREATE (e:Episode {name: $name, body: $body, source: $source}) RETURN e";
        let params = serde_json::json!({
            "name": name,
            "body": body,
            "source": source,
        });
        self.neo4j_client.execute_cypher(cypher, params).await?;
        Ok(())
    }
}