alopex-cli 0.6.0

//! HNSW Command - HNSW index management
//!
//! Supports: create, stats, drop

use std::io::Write;
use std::path::PathBuf;

use alopex_embedded::{Database, HnswConfig, Metric};
use serde::{Deserialize, Serialize};

use crate::batch::BatchMode;
use crate::cli::{DistanceMetric, HnswCommand, OutputFormat};
use crate::client::http::{ClientError, HttpClient};
use crate::error::Result;
use crate::models::{Column, DataType, Row, Value};
use crate::output::formatter::Formatter;
use crate::output::RowCollector;
use crate::streaming::StreamingWriter;
use crate::tui::admin::{AdminBackend, AdminContext, AdminTarget, AuthCapabilities};
use crate::tui::renderer::render_output;

/// Default M parameter (max connections per node)
const DEFAULT_M: usize = 16;
/// Default ef_construction parameter
const DEFAULT_EF_CONSTRUCTION: usize = 200;

#[derive(Debug, Serialize)]
struct RemoteHnswCreateRequest {
    index: String,
    dim: usize,
    metric: String,
}

#[derive(Debug, Serialize)]
struct RemoteHnswDropRequest {
    index: String,
}

#[derive(Debug, Serialize)]
struct RemoteHnswStatsRequest {
    index: String,
}

#[derive(Debug, Deserialize)]
struct RemoteHnswStatsResponse {
    stats: RemoteHnswStats,
}

#[derive(Debug, Deserialize)]
struct RemoteHnswStats {
    node_count: u64,
    deleted_count: u64,
    memory_bytes: u64,
    avg_edges_per_node: f64,
}

#[derive(Debug, Deserialize)]
struct RemoteHnswStatusResponse {
    success: bool,
}

/// Execute an HNSW command.
///
/// # Arguments
///
/// * `db` - The database instance.
/// * `cmd` - The HNSW subcommand to execute.
/// * `writer` - The streaming writer for output.
pub fn execute<W: Write>(
    db: &Database,
    cmd: HnswCommand,
    writer: &mut StreamingWriter<W>,
) -> Result<()> {
    match cmd {
        HnswCommand::Create { name, dim, metric } => execute_create(db, &name, dim, metric, writer),
        HnswCommand::Stats { name } => execute_stats(db, &name, writer),
        HnswCommand::Drop { name } => execute_drop(db, &name, writer),
    }
}

#[allow(clippy::too_many_arguments)]
pub fn execute_tui(
    db: &Database,
    cmd: HnswCommand,
    batch_mode: &BatchMode,
    output_format: OutputFormat,
    columns: Vec<Column>,
    limit: Option<usize>,
    quiet: bool,
    connection_label: impl Into<String>,
    data_dir: Option<PathBuf>,
) -> Result<()> {
    let connection_label = connection_label.into();
    let context_message = Some(hnsw_command_context(&cmd));
    let admin_label = connection_label.clone();
    let admin_data_dir = data_dir.clone();
    let admin_launcher: Option<Box<dyn FnMut() -> Result<()> + '_>> = Some(Box::new(move || {
        let connection_label = admin_label.clone();
        let data_dir = admin_data_dir.clone();
        crate::tui::admin::run_admin_ui(AdminContext {
            connection_label,
            auth: AuthCapabilities::full(),
            backend: AdminBackend::Local {
                db,
                batch_mode,
                output_format,
                limit,
                quiet,
                data_dir,
            },
            initial_target: Some(AdminTarget::Hnsw),
        })
    }));
    let collector = RowCollector::new();
    let formatter = Box::new(collector.formatter());
    let mut sink = std::io::sink();
    let mut writer =
        StreamingWriter::new(&mut sink, formatter, columns.clone(), limit).with_quiet(quiet);
    execute(db, cmd, &mut writer)?;
    let warning = collector.truncation_warning();
    render_output(
        columns,
        collector.rows(),
        connection_label,
        context_message,
        true,
        warning,
        output_format,
        admin_launcher,
    )
}

/// Execute an HNSW command against a remote server.
pub async fn execute_remote_with_formatter<W: Write>(
    client: &HttpClient,
    cmd: &HnswCommand,
    writer: &mut W,
    formatter: Box<dyn Formatter>,
    limit: Option<usize>,
    quiet: bool,
) -> Result<()> {
    match cmd {
        HnswCommand::Create { name, dim, metric } => {
            execute_remote_create(client, name, *dim, *metric, writer, formatter, limit, quiet)
                .await
        }
        HnswCommand::Stats { name } => {
            execute_remote_stats(client, name, writer, formatter, limit, quiet).await
        }
        HnswCommand::Drop { name } => {
            execute_remote_drop(client, name, writer, formatter, limit, quiet).await
        }
    }
}

#[allow(clippy::too_many_arguments)]
pub async fn execute_remote_tui<'a>(
    client: &HttpClient,
    cmd: &HnswCommand,
    columns: Vec<Column>,
    output_format: OutputFormat,
    limit: Option<usize>,
    quiet: bool,
    connection_label: impl Into<String>,
    admin_launcher: Option<Box<dyn FnMut() -> Result<()> + 'a>>,
) -> Result<()> {
    let collector = RowCollector::new();
    let formatter = Box::new(collector.formatter());
    let mut sink = std::io::sink();
    execute_remote_with_formatter(client, cmd, &mut sink, formatter, limit, quiet).await?;
    let warning = collector.truncation_warning();
    render_output(
        columns,
        collector.rows(),
        connection_label,
        Some(hnsw_command_context(cmd)),
        true,
        warning,
        output_format,
        admin_launcher,
    )
}

/// Convert CLI distance metric to embedded Metric.
fn to_embedded_metric(metric: DistanceMetric) -> Metric {
    match metric {
        DistanceMetric::Cosine => Metric::Cosine,
        DistanceMetric::L2 => Metric::L2,
        DistanceMetric::Ip => Metric::InnerProduct,
    }
}

fn metric_to_string(metric: DistanceMetric) -> String {
    match metric {
        DistanceMetric::Cosine => "cosine".to_string(),
        DistanceMetric::L2 => "l2".to_string(),
        DistanceMetric::Ip => "ip".to_string(),
    }
}

#[allow(clippy::too_many_arguments)]
async fn execute_remote_create<W: Write>(
    client: &HttpClient,
    name: &str,
    dim: usize,
    metric: DistanceMetric,
    writer: &mut W,
    formatter: Box<dyn Formatter>,
    limit: Option<usize>,
    quiet: bool,
) -> Result<()> {
    let request = RemoteHnswCreateRequest {
        index: name.to_string(),
        dim,
        metric: metric_to_string(metric),
    };
    let response: RemoteHnswStatusResponse = client
        .post_json("hnsw/create", &request)
        .await
        .map_err(map_client_error)?;
    if response.success {
        if quiet {
            return Ok(());
        }
        let columns = hnsw_status_columns();
        let mut streaming_writer =
            StreamingWriter::new(writer, formatter, columns, limit).with_quiet(quiet);
        streaming_writer.prepare(Some(1))?;
        let row = Row::new(vec![
            Value::Text("OK".to_string()),
            Value::Text(format!("Created HNSW index: {}", name)),
        ]);
        streaming_writer.write_row(row)?;
        streaming_writer.finish()
    } else {
        Err(crate::error::CliError::InvalidArgument(
            "Failed to create HNSW index".to_string(),
        ))
    }
}

#[allow(clippy::too_many_arguments)]
async fn execute_remote_stats<W: Write>(
    client: &HttpClient,
    name: &str,
    writer: &mut W,
    formatter: Box<dyn Formatter>,
    limit: Option<usize>,
    quiet: bool,
) -> Result<()> {
    let request = RemoteHnswStatsRequest {
        index: name.to_string(),
    };
    let response: RemoteHnswStatsResponse = client
        .post_json("hnsw/stats", &request)
        .await
        .map_err(map_client_error)?;
    let stats = response.stats;
    let columns = hnsw_stats_columns();
    let mut streaming_writer =
        StreamingWriter::new(writer, formatter, columns, limit).with_quiet(quiet);
    streaming_writer.prepare(Some(4))?;
    let stats_rows = vec![
        ("node_count", Value::Int(stats.node_count as i64)),
        ("deleted_count", Value::Int(stats.deleted_count as i64)),
        ("memory_bytes", Value::Int(stats.memory_bytes as i64)),
        ("avg_edges_per_node", Value::Float(stats.avg_edges_per_node)),
    ];
    for (key, value) in stats_rows {
        let row = Row::new(vec![Value::Text(key.to_string()), value]);
        streaming_writer.write_row(row)?;
    }
    streaming_writer.finish()
}

#[allow(clippy::too_many_arguments)]
async fn execute_remote_drop<W: Write>(
    client: &HttpClient,
    name: &str,
    writer: &mut W,
    formatter: Box<dyn Formatter>,
    limit: Option<usize>,
    quiet: bool,
) -> Result<()> {
    let request = RemoteHnswDropRequest {
        index: name.to_string(),
    };
    let response: RemoteHnswStatusResponse = client
        .post_json("hnsw/drop", &request)
        .await
        .map_err(map_client_error)?;
    if response.success {
        if quiet {
            return Ok(());
        }
        let columns = hnsw_status_columns();
        let mut streaming_writer =
            StreamingWriter::new(writer, formatter, columns, limit).with_quiet(quiet);
        streaming_writer.prepare(Some(1))?;
        let row = Row::new(vec![
            Value::Text("OK".to_string()),
            Value::Text(format!("Dropped HNSW index: {}", name)),
        ]);
        streaming_writer.write_row(row)?;
        streaming_writer.finish()
    } else {
        Err(crate::error::CliError::InvalidArgument(
            "Failed to drop HNSW index".to_string(),
        ))
    }
}

fn map_client_error(err: ClientError) -> crate::error::CliError {
    match err {
        ClientError::Request { source, .. } => {
            crate::error::CliError::ServerConnection(format!("request failed: {source}"))
        }
        ClientError::InvalidUrl(message) => crate::error::CliError::InvalidArgument(message),
        ClientError::Build(message) => crate::error::CliError::InvalidArgument(message),
        ClientError::Auth(err) => crate::error::CliError::InvalidArgument(err.to_string()),
        ClientError::HttpStatus { status, body } => crate::error::CliError::InvalidArgument(
            format!("Server error: HTTP {} - {}", status.as_u16(), body),
        ),
    }
}

fn hnsw_command_context(cmd: &HnswCommand) -> String {
    match cmd {
        HnswCommand::Create { name, dim, metric } => format!(
            "hnsw create {name} --dim {dim} --metric {}",
            metric_to_string(*metric)
        ),
        HnswCommand::Stats { name } => format!("hnsw stats {name}"),
        HnswCommand::Drop { name } => format!("hnsw drop {name}"),
    }
}

/// Execute an HNSW create command.
fn execute_create<W: Write>(
    db: &Database,
    name: &str,
    dim: usize,
    metric: DistanceMetric,
    writer: &mut StreamingWriter<W>,
) -> Result<()> {
    let config = HnswConfig {
        dimension: dim,
        metric: to_embedded_metric(metric),
        m: DEFAULT_M,
        ef_construction: DEFAULT_EF_CONSTRUCTION,
    };

    db.create_hnsw_index(name, config)?;

    // Suppress status output in quiet mode
    if !writer.is_quiet() {
        writer.prepare(Some(1))?;
        let row = Row::new(vec![
            Value::Text("OK".to_string()),
            Value::Text(format!("Created HNSW index: {}", name)),
        ]);
        writer.write_row(row)?;
        writer.finish()?;
    }

    Ok(())
}

/// Execute an HNSW stats command.
fn execute_stats<W: Write>(
    db: &Database,
    name: &str,
    writer: &mut StreamingWriter<W>,
) -> Result<()> {
    let stats = db.get_hnsw_stats(name)?;

    // Output stats as rows
    writer.prepare(Some(4))?;

    // Output each stat as a row
    let stats_rows = vec![
        ("node_count", Value::Int(stats.node_count as i64)),
        ("deleted_count", Value::Int(stats.deleted_count as i64)),
        ("memory_bytes", Value::Int(stats.memory_bytes as i64)),
        ("avg_edges_per_node", Value::Float(stats.avg_edges_per_node)),
    ];

    for (key, value) in stats_rows {
        let row = Row::new(vec![Value::Text(key.to_string()), value]);
        writer.write_row(row)?;
    }

    writer.finish()?;
    Ok(())
}

/// Execute an HNSW drop command.
fn execute_drop<W: Write>(
    db: &Database,
    name: &str,
    writer: &mut StreamingWriter<W>,
) -> Result<()> {
    db.drop_hnsw_index(name)?;

    // Suppress status output in quiet mode
    if !writer.is_quiet() {
        writer.prepare(Some(1))?;
        let row = Row::new(vec![
            Value::Text("OK".to_string()),
            Value::Text(format!("Dropped HNSW index: {}", name)),
        ]);
        writer.write_row(row)?;
        writer.finish()?;
    }

    Ok(())
}

/// Create columns for HNSW stats output.
///
/// Note: value column is Text because stats include both integer and float values.
pub fn hnsw_stats_columns() -> Vec<Column> {
    vec![
        Column::new("property", DataType::Text),
        Column::new("value", DataType::Text),
    ]
}

/// Create columns for HNSW status output.
pub fn hnsw_status_columns() -> Vec<Column> {
    vec![
        Column::new("status", DataType::Text),
        Column::new("message", DataType::Text),
    ]
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::output::jsonl::JsonlFormatter;

    fn create_test_db() -> Database {
        Database::open_in_memory().unwrap()
    }

    fn create_stats_writer(output: &mut Vec<u8>) -> StreamingWriter<&mut Vec<u8>> {
        let formatter = Box::new(JsonlFormatter::new());
        let columns = hnsw_stats_columns();
        StreamingWriter::new(output, formatter, columns, None)
    }

    fn create_status_writer(output: &mut Vec<u8>) -> StreamingWriter<&mut Vec<u8>> {
        let formatter = Box::new(JsonlFormatter::new());
        let columns = hnsw_status_columns();
        StreamingWriter::new(output, formatter, columns, None)
    }

    #[test]
    fn test_create_hnsw_index() {
        let db = create_test_db();

        let mut output = Vec::new();
        {
            let mut writer = create_status_writer(&mut output);
            execute_create(&db, "test_index", 128, DistanceMetric::Cosine, &mut writer).unwrap();
        }

        let result = String::from_utf8(output).unwrap();
        assert!(result.contains("OK"));
        assert!(result.contains("Created HNSW index"));
    }

    #[test]
    fn test_create_hnsw_index_l2() {
        let db = create_test_db();

        let mut output = Vec::new();
        {
            let mut writer = create_status_writer(&mut output);
            execute_create(&db, "l2_index", 64, DistanceMetric::L2, &mut writer).unwrap();
        }

        let result = String::from_utf8(output).unwrap();
        assert!(result.contains("OK"));
        assert!(result.contains("Created HNSW index: l2_index"));
    }

    #[test]
    fn test_get_hnsw_stats() {
        let db = create_test_db();

        // Create index first
        {
            let mut output = Vec::new();
            let mut writer = create_status_writer(&mut output);
            execute_create(&db, "stats_test", 64, DistanceMetric::Cosine, &mut writer).unwrap();
        }

        // Get stats
        let mut output = Vec::new();
        {
            let mut writer = create_stats_writer(&mut output);
            execute_stats(&db, "stats_test", &mut writer).unwrap();
        }

        let result = String::from_utf8(output).unwrap();
        assert!(result.contains("node_count"));
        assert!(result.contains("memory_bytes"));
    }

    #[test]
    fn test_drop_hnsw_index() {
        let db = create_test_db();

        // Create index first
        {
            let mut output = Vec::new();
            let mut writer = create_status_writer(&mut output);
            execute_create(&db, "drop_test", 32, DistanceMetric::Cosine, &mut writer).unwrap();
        }

        // Drop index
        let mut output = Vec::new();
        {
            let mut writer = create_status_writer(&mut output);
            execute_drop(&db, "drop_test", &mut writer).unwrap();
        }

        let result = String::from_utf8(output).unwrap();
        assert!(result.contains("OK"));
        assert!(result.contains("Dropped HNSW index"));
    }

    #[test]
    fn test_create_and_query_index() {
        let db = create_test_db();

        // Create index
        {
            let mut output = Vec::new();
            let mut writer = create_status_writer(&mut output);
            execute_create(&db, "query_test", 3, DistanceMetric::Cosine, &mut writer).unwrap();
        }

        // Stats should show 0 vectors initially
        let mut output = Vec::new();
        {
            let mut writer = create_stats_writer(&mut output);
            execute_stats(&db, "query_test", &mut writer).unwrap();
        }

        let result = String::from_utf8(output).unwrap();
        assert!(result.contains("node_count"));
    }
}