ruvector/crates/ruvector-cli/src/cli/graph.rs

//! Graph database command implementations

use crate::cli::{format_error, format_info, format_success, ProgressTracker};
use crate::config::Config;
use anyhow::{Context, Result};
use colored::*;
use std::io::{self, BufRead, Write};
use std::path::Path;
use std::time::Instant;

/// Graph database subcommands
#[derive(clap::Subcommand, Debug)]
pub enum GraphCommands {
    /// Create a new graph database
    Create {
        /// Database file path
        #[arg(short, long, default_value = "./ruvector-graph.db")]
        path: String,

        /// Graph name
        #[arg(short, long, default_value = "default")]
        name: String,

        /// Enable property indexing
        #[arg(long)]
        indexed: bool,
    },

    /// Execute a Cypher query
    Query {
        /// Database file path
        #[arg(short = 'b', long, default_value = "./ruvector-graph.db")]
        db: String,

        /// Cypher query to execute
        #[arg(short = 'q', long)]
        cypher: String,

        /// Output format (table, json, csv)
        #[arg(long, default_value = "table")]
        format: String,

        /// Show execution plan
        #[arg(long)]
        explain: bool,
    },

    /// Interactive Cypher shell (REPL)
    Shell {
        /// Database file path
        #[arg(short = 'b', long, default_value = "./ruvector-graph.db")]
        db: String,

        /// Enable multiline mode
        #[arg(long)]
        multiline: bool,
    },

    /// Import data from file
    Import {
        /// Database file path
        #[arg(short = 'b', long, default_value = "./ruvector-graph.db")]
        db: String,

        /// Input file path
        #[arg(short = 'i', long)]
        input: String,

        /// Input format (csv, json, cypher)
        #[arg(long, default_value = "json")]
        format: String,

        /// Graph name
        #[arg(short = 'g', long, default_value = "default")]
        graph: String,

        /// Skip errors and continue
        #[arg(long)]
        skip_errors: bool,
    },

    /// Export graph data to file
    Export {
        /// Database file path
        #[arg(short = 'b', long, default_value = "./ruvector-graph.db")]
        db: String,

        /// Output file path
        #[arg(short = 'o', long)]
        output: String,

        /// Output format (json, csv, cypher, graphml)
        #[arg(long, default_value = "json")]
        format: String,

        /// Graph name
        #[arg(short = 'g', long, default_value = "default")]
        graph: String,
    },

    /// Show graph database information
    Info {
        /// Database file path
        #[arg(short = 'b', long, default_value = "./ruvector-graph.db")]
        db: String,

        /// Show detailed statistics
        #[arg(long)]
        detailed: bool,
    },

    /// Run graph benchmarks
    Benchmark {
        /// Database file path
        #[arg(short = 'b', long, default_value = "./ruvector-graph.db")]
        db: String,

        /// Number of queries to run
        #[arg(short = 'n', long, default_value = "1000")]
        queries: usize,

        /// Benchmark type (traverse, pattern, aggregate)
        #[arg(short = 't', long, default_value = "traverse")]
        bench_type: String,
    },

    /// Start HTTP/gRPC server
    Serve {
        /// Database file path
        #[arg(short = 'b', long, default_value = "./ruvector-graph.db")]
        db: String,

        /// Server host
        #[arg(long, default_value = "127.0.0.1")]
        host: String,

        /// HTTP port
        #[arg(long, default_value = "8080")]
        http_port: u16,

        /// gRPC port
        #[arg(long, default_value = "50051")]
        grpc_port: u16,

        /// Enable GraphQL endpoint
        #[arg(long)]
        graphql: bool,
    },
}

/// Create a new graph database
pub fn create_graph(path: &str, name: &str, indexed: bool, config: &Config) -> Result<()> {
    println!(
        "{}",
        format_success(&format!("Creating graph database at: {}", path))
    );
    println!("  Graph name: {}", name.cyan());
    println!(
        "  Property indexing: {}",
        if indexed {
            "enabled".green()
        } else {
            "disabled".dimmed()
        }
    );

    // TODO: Integrate with ruvector-neo4j when available
    // For now, create a placeholder implementation
    std::fs::create_dir_all(Path::new(path).parent().unwrap_or(Path::new(".")))?;

    println!("{}", format_success("Graph database created successfully!"));
    println!(
        "{}",
        format_info("Use 'ruvector graph shell' to start interactive mode")
    );

    Ok(())
}

/// Execute a Cypher query
pub fn execute_query(
    db_path: &str,
    cypher: &str,
    format: &str,
    explain: bool,
    config: &Config,
) -> Result<()> {
    if explain {
        println!("{}", "Query Execution Plan:".bold().cyan());
        println!("{}", format_info("EXPLAIN mode - showing query plan"));
    }

    let start = Instant::now();

    // TODO: Integrate with ruvector-neo4j Neo4jGraph implementation
    // Placeholder for actual query execution
    println!("{}", format_success("Executing Cypher query..."));
    println!("  Query: {}", cypher.dimmed());

    let elapsed = start.elapsed();

    match format {
        "table" => {
            println!("\n{}", format_graph_results_table(&[], cypher));
        }
        "json" => {
            println!("{}", format_graph_results_json(&[])?);
        }
        "csv" => {
            println!("{}", format_graph_results_csv(&[])?);
        }
        _ => return Err(anyhow::anyhow!("Unsupported output format: {}", format)),
    }

    println!(
        "\n{}",
        format!("Query completed in {:.2}ms", elapsed.as_secs_f64() * 1000.0).dimmed()
    );

    Ok(())
}

/// Interactive Cypher shell (REPL)
pub fn run_shell(db_path: &str, multiline: bool, config: &Config) -> Result<()> {
    println!("{}", "RuVector Graph Shell".bold().green());
    println!("Database: {}", db_path.cyan());
    println!(
        "Type {} to exit, {} for help\n",
        ":exit".yellow(),
        ":help".yellow()
    );

    let stdin = io::stdin();
    let mut stdout = io::stdout();
    let mut query_buffer = String::new();

    loop {
        // Print prompt
        if multiline && !query_buffer.is_empty() {
            print!("{}", "   ... ".dimmed());
        } else {
            print!("{}", "cypher> ".green().bold());
        }
        stdout.flush()?;

        // Read line
        let mut line = String::new();
        stdin.lock().read_line(&mut line)?;
        let line = line.trim();

        // Handle special commands
        match line {
            ":exit" | ":quit" | ":q" => {
                println!("{}", format_success("Goodbye!"));
                break;
            }
            ":help" | ":h" => {
                print_shell_help();
                continue;
            }
            ":clear" => {
                query_buffer.clear();
                println!("{}", format_info("Query buffer cleared"));
                continue;
            }
            "" => {
                if !multiline || query_buffer.is_empty() {
                    continue;
                }
                // In multiline mode, empty line executes query
            }
            _ => {
                query_buffer.push_str(line);
                query_buffer.push(' ');

                if multiline && !line.ends_with(';') {
                    continue; // Continue reading in multiline mode
                }
            }
        }

        // Execute query
        let query = query_buffer.trim().trim_end_matches(';');
        if !query.is_empty() {
            match execute_query(db_path, query, "table", false, config) {
                Ok(_) => {}
                Err(e) => println!("{}", format_error(&e.to_string())),
            }
        }

        query_buffer.clear();
    }

    Ok(())
}

/// Import graph data from file
pub fn import_graph(
    db_path: &str,
    input_file: &str,
    format: &str,
    graph_name: &str,
    skip_errors: bool,
    config: &Config,
) -> Result<()> {
    println!(
        "{}",
        format_success(&format!("Importing graph data from: {}", input_file))
    );
    println!("  Format: {}", format.cyan());
    println!("  Graph: {}", graph_name.cyan());
    println!(
        "  Skip errors: {}",
        if skip_errors {
            "yes".yellow()
        } else {
            "no".dimmed()
        }
    );

    let start = Instant::now();

    // TODO: Implement actual import logic with ruvector-neo4j
    match format {
        "csv" => {
            println!("{}", format_info("Parsing CSV file..."));
            // Parse CSV and create nodes/relationships
        }
        "json" => {
            println!("{}", format_info("Parsing JSON file..."));
            // Parse JSON and create graph structure
        }
        "cypher" => {
            println!("{}", format_info("Executing Cypher statements..."));
            // Execute Cypher commands from file
        }
        _ => return Err(anyhow::anyhow!("Unsupported import format: {}", format)),
    }

    let elapsed = start.elapsed();
    println!(
        "{}",
        format_success(&format!(
            "Import completed in {:.2}s",
            elapsed.as_secs_f64()
        ))
    );

    Ok(())
}

/// Export graph data to file
pub fn export_graph(
    db_path: &str,
    output_file: &str,
    format: &str,
    graph_name: &str,
    config: &Config,
) -> Result<()> {
    println!(
        "{}",
        format_success(&format!("Exporting graph to: {}", output_file))
    );
    println!("  Format: {}", format.cyan());
    println!("  Graph: {}", graph_name.cyan());

    let start = Instant::now();

    // TODO: Implement actual export logic with ruvector-neo4j
    match format {
        "json" => {
            println!("{}", format_info("Generating JSON export..."));
            // Export as JSON graph format
        }
        "csv" => {
            println!("{}", format_info("Generating CSV export..."));
            // Export nodes and edges as CSV files
        }
        "cypher" => {
            println!("{}", format_info("Generating Cypher statements..."));
            // Export as Cypher CREATE statements
        }
        "graphml" => {
            println!("{}", format_info("Generating GraphML export..."));
            // Export as GraphML XML format
        }
        _ => return Err(anyhow::anyhow!("Unsupported export format: {}", format)),
    }

    let elapsed = start.elapsed();
    println!(
        "{}",
        format_success(&format!(
            "Export completed in {:.2}s",
            elapsed.as_secs_f64()
        ))
    );

    Ok(())
}

/// Show graph database information
pub fn show_graph_info(db_path: &str, detailed: bool, config: &Config) -> Result<()> {
    println!("\n{}", "Graph Database Statistics".bold().green());

    // TODO: Integrate with ruvector-neo4j to get actual statistics
    println!("  Database: {}", db_path.cyan());
    println!("  Graphs: {}", "1".cyan());
    println!("  Total nodes: {}", "0".cyan());
    println!("  Total relationships: {}", "0".cyan());
    println!("  Node labels: {}", "0".cyan());
    println!("  Relationship types: {}", "0".cyan());

    if detailed {
        println!("\n{}", "Storage Information:".bold().cyan());
        println!("  Store size: {}", "0 bytes".cyan());
        println!("  Index size: {}", "0 bytes".cyan());

        println!("\n{}", "Configuration:".bold().cyan());
        println!("  Cache size: {}", "N/A".cyan());
        println!("  Page size: {}", "N/A".cyan());
    }

    Ok(())
}

/// Run graph benchmarks
pub fn run_graph_benchmark(
    db_path: &str,
    num_queries: usize,
    bench_type: &str,
    config: &Config,
) -> Result<()> {
    println!("{}", "Running graph benchmark...".bold().green());
    println!("  Benchmark type: {}", bench_type.cyan());
    println!("  Queries: {}", num_queries.to_string().cyan());

    let start = Instant::now();

    // TODO: Implement actual benchmarks with ruvector-neo4j
    match bench_type {
        "traverse" => {
            println!("{}", format_info("Benchmarking graph traversal..."));
            // Run traversal queries
        }
        "pattern" => {
            println!("{}", format_info("Benchmarking pattern matching..."));
            // Run pattern matching queries
        }
        "aggregate" => {
            println!("{}", format_info("Benchmarking aggregations..."));
            // Run aggregation queries
        }
        _ => return Err(anyhow::anyhow!("Unknown benchmark type: {}", bench_type)),
    }

    let elapsed = start.elapsed();
    let qps = num_queries as f64 / elapsed.as_secs_f64();
    let avg_latency = elapsed.as_secs_f64() * 1000.0 / num_queries as f64;

    println!("\n{}", "Benchmark Results:".bold().green());
    println!("  Total time: {:.2}s", elapsed.as_secs_f64());
    println!("  Queries per second: {:.0}", qps.to_string().cyan());
    println!("  Average latency: {:.2}ms", avg_latency.to_string().cyan());

    Ok(())
}

/// Start HTTP/gRPC server
pub fn serve_graph(
    db_path: &str,
    host: &str,
    http_port: u16,
    grpc_port: u16,
    enable_graphql: bool,
    config: &Config,
) -> Result<()> {
    println!("{}", "Starting RuVector Graph Server...".bold().green());
    println!("  Database: {}", db_path.cyan());
    println!(
        "  HTTP endpoint: {}:{}",
        host.cyan(),
        http_port.to_string().cyan()
    );
    println!(
        "  gRPC endpoint: {}:{}",
        host.cyan(),
        grpc_port.to_string().cyan()
    );

    if enable_graphql {
        println!(
            "  GraphQL endpoint: {}:{}/graphql",
            host.cyan(),
            http_port.to_string().cyan()
        );
    }

    println!("\n{}", format_info("Server configuration loaded"));

    // TODO: Implement actual server with ruvector-neo4j
    println!("{}", format_success("Server ready! Press Ctrl+C to stop."));

    // Placeholder - would run actual server here
    println!(
        "\n{}",
        format_info("Server implementation pending - integrate with ruvector-neo4j")
    );

    Ok(())
}

// Helper functions for formatting graph results

fn format_graph_results_table(results: &[serde_json::Value], query: &str) -> String {
    let mut output = String::new();

    if results.is_empty() {
        output.push_str(&format!("{}\n", "No results found".dimmed()));
        output.push_str(&format!("Query: {}\n", query.dimmed()));
    } else {
        output.push_str(&format!("{} results\n", results.len().to_string().cyan()));
        // TODO: Format results as table
    }

    output
}

fn format_graph_results_json(results: &[serde_json::Value]) -> Result<String> {
    serde_json::to_string_pretty(&results)
        .map_err(|e| anyhow::anyhow!("Failed to serialize results: {}", e))
}

fn format_graph_results_csv(results: &[serde_json::Value]) -> Result<String> {
    // TODO: Implement CSV formatting
    Ok(String::new())
}

fn print_shell_help() {
    println!("\n{}", "RuVector Graph Shell Commands".bold().cyan());
    println!("  {}  - Exit the shell", ":exit, :quit, :q".yellow());
    println!(
        "  {}          - Show this help message",
        ":help, :h".yellow()
    );
    println!("  {}         - Clear query buffer", ":clear".yellow());
    println!("\n{}", "Cypher Examples:".bold().cyan());
    println!("  {}", "CREATE (n:Person {{name: 'Alice'}})".dimmed());
    println!("  {}", "MATCH (n:Person) RETURN n".dimmed());
    println!("  {}", "MATCH (a)-[r:KNOWS]->(b) RETURN a, r, b".dimmed());
    println!();
}