jin 0.1.0

Approximate Nearest Neighbor Search: HNSW, DiskANN, IVF-PQ, ScaNN, quantization
Documentation 
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//! IVF-PQ persistence.
//!
//! Provides disk persistence for IVF-PQ (Inverted File Index with Product Quantization) indexes.
//!
//! See `docs/PERSISTENCE_DESIGN_DENSE.md` for format specifications.
//!
//! # Status: Placeholder
//!
//! The reader fields are placeholders for future implementation.

#![allow(dead_code)]

use crate::persistence::directory::Directory;
use crate::persistence::error::{PersistenceError, PersistenceResult};
use std::io::Write;

#[cfg(feature = "ivf_pq")]
use crate::ivf_pq::IVFPQIndex;

/// IVF-PQ segment writer for index persistence.
#[cfg(feature = "ivf_pq")]
pub struct IVFPQSegmentWriter {
    directory: Box<dyn Directory>,
    segment_id: u64,
}

#[cfg(feature = "ivf_pq")]
impl IVFPQSegmentWriter {
    /// Create a new IVF-PQ segment writer.
    pub fn new(directory: Box<dyn Directory>, segment_id: u64) -> Self {
        Self {
            directory,
            segment_id,
        }
    }

    /// Write an IVF-PQ index to disk.
    ///
    /// Format:
    /// - `vectors.bin`: Vector data (SoA layout)
    /// - `inverted_lists.bin`: Inverted file lists (cluster -> document IDs)
    /// - `pq_codebooks.bin`: Product quantization codebooks
    /// - `pq_codes.bin`: Quantized vector codes
    /// - `centroids.bin`: Cluster centroids
    /// - `params.bin`: IVF-PQ parameters
    /// - `metadata.bin`: Index metadata
    pub fn write_ivf_pq_index(&mut self, _index: &IVFPQIndex) -> PersistenceResult<()> {
        let segment_dir = format!("segments/segment_ivf_pq_{}", self.segment_id);
        self.directory.create_dir_all(&segment_dir)?;

        // Write vectors (reuse dense segment format)
        let vectors_path = format!("{}/vectors.bin", segment_dir);
        let mut vectors_file = self.directory.create_file(&vectors_path)?;
        // Note: IVFPQIndex structure would need to expose vectors
        // For now, this is a placeholder
        vectors_file.flush()?;

        // Write parameters
        let params_path = format!("{}/params.bin", segment_dir);
        let mut params_file = self.directory.create_file(&params_path)?;
        // Note: IVFPQIndex structure would need to expose params
        // For now, this is a placeholder
        params_file.flush()?;

        // Write metadata
        let metadata_path = format!("{}/metadata.bin", segment_dir);
        let mut metadata_file = self.directory.create_file(&metadata_path)?;
        // Note: IVFPQIndex structure would need to expose dimension, num_vectors
        // For now, this is a placeholder
        metadata_file.flush()?;

        Ok(())
    }
}

/// IVF-PQ segment reader for loading indexes from disk.
#[cfg(feature = "ivf_pq")]
pub struct IVFPQSegmentReader {
    directory: Box<dyn Directory>,
    segment_id: u64,
}

#[cfg(feature = "ivf_pq")]
impl IVFPQSegmentReader {
    /// Load an IVF-PQ segment from disk.
    pub fn load(directory: Box<dyn Directory>, segment_id: u64) -> PersistenceResult<Self> {
        Ok(Self {
            directory,
            segment_id,
        })
    }

    /// Reconstruct the IVF-PQ index from disk.
    ///
    /// Note: This is a placeholder. Full reconstruction requires
    /// IVFPQIndex to expose a constructor or builder.
    pub fn load_index(&self) -> PersistenceResult<IVFPQIndex> {
        Err(PersistenceError::NotSupported(
            "IVFPQIndex reconstruction requires implementation in ivf_pq module".to_string(),
        ))
    }
}