auradb 0.1.0

High-performance Rust storage engine with WAL-time KV separation, RL-driven compaction, and learned indexes
Documentation 
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//! SST (Sorted String Table) management module
//! 
//! This module will implement multi-level LSM structure with block-based storage,
//! compression, and Bloom/Ribbon filters.
//! 
//! Planned for M2 milestone.

use crate::error::{Error, Result};

/// SST file metadata
#[derive(Debug, Clone)]
pub struct SstFile {
    /// File path
    pub path: String,
    /// File size in bytes
    pub size: u64,
    /// Level in LSM tree
    pub level: u32,
    /// Number of entries
    pub entry_count: u64,
    /// Smallest key
    pub smallest_key: Vec<u8>,
    /// Largest key
    pub largest_key: Vec<u8>,
}

/// SST block information
#[derive(Debug, Clone)]
pub struct SstBlock {
    /// Block offset in file
    pub offset: u64,
    /// Block size in bytes
    pub size: u32,
    /// Number of entries in block
    pub entry_count: u32,
    /// Block checksum
    pub checksum: u32,
}

/// SST reader for reading data from SST files
pub struct SstReader {
    // TODO: Implement SST reading functionality
}

impl SstReader {
    /// Create a new SST reader
    pub fn new(_path: &str) -> Result<Self> {
        // TODO: Implement
        Err(Error::Unknown("SST reader not implemented yet".to_string()))
    }
    
    /// Read a block from the SST file
    pub fn read_block(&mut self, _block: &SstBlock) -> Result<Vec<u8>> {
        // TODO: Implement
        Err(Error::Unknown("SST block reading not implemented yet".to_string()))
    }
}

/// SST writer for creating new SST files
pub struct SstWriter {
    // TODO: Implement SST writing functionality
}

impl SstWriter {
    /// Create a new SST writer
    pub fn new(_path: &str) -> Result<Self> {
        // TODO: Implement
        Err(Error::Unknown("SST writer not implemented yet".to_string()))
    }
    
    /// Write a block to the SST file
    pub fn write_block(&mut self, _data: &[u8]) -> Result<SstBlock> {
        // TODO: Implement
        Err(Error::Unknown("SST block writing not implemented yet".to_string()))
    }
    
    /// Finalize the SST file
    pub fn finish(&mut self) -> Result<SstFile> {
        // TODO: Implement
        Err(Error::Unknown("SST file finalization not implemented yet".to_string()))
    }
}

/// SST manager for handling multiple SST files
pub struct SstManager {
    // TODO: Implement SST management functionality
}

impl SstManager {
    /// Create a new SST manager
    pub fn new() -> Self {
        Self {}
    }
    
    /// Add an SST file to the manager
    pub fn add_file(&mut self, _file: SstFile) -> Result<()> {
        // TODO: Implement
        Ok(())
    }
    
    /// Get SST files for a given level
    pub fn get_files_at_level(&self, _level: u32) -> Vec<&SstFile> {
        // TODO: Implement
        Vec::new()
    }
    
    /// Get total size of all SST files
    pub fn total_size(&self) -> u64 {
        // TODO: Implement
        0
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    
    #[test]
    fn test_sst_manager_creation() {
        let manager = SstManager::new();
        assert_eq!(manager.total_size(), 0);
    }
}