oxirs-vec 0.2.4

//! GPU-accelerated vector index implementations

use super::{GpuConfig, GpuBuffer};
use crate::{Vector, VectorIndex};
use anyhow::Result;
use std::collections::HashMap;

/// GPU operation types for batch processing
#[derive(Debug, Clone)]
pub enum GpuOperationType {
    Search,
    Insert,
    Update,
    Delete,
}

/// Results from GPU operations
#[derive(Debug)]
pub struct GpuOperationResult {
    pub operation: GpuOperationType,
    pub execution_time_ms: f64,
    pub memory_used: usize,
    pub success: bool,
}

/// GPU-accelerated vector index implementation
pub struct GpuVectorIndex {
    config: GpuConfig,
    vectors: Vec<Vector>,
    gpu_buffers: Vec<GpuBuffer>,
}

impl GpuVectorIndex {
    /// Create new GPU vector index
    pub fn new(config: GpuConfig) -> Result<Self> {
        Ok(Self {
            config,
            vectors: Vec::new(),
            gpu_buffers: Vec::new(),
        })
    }

    /// Search for similar vectors using GPU acceleration
    pub fn gpu_search(&self, query: &Vector, k: usize) -> Result<Vec<(usize, f32)>> {
        // GPU search implementation would go here
        Ok(vec![(0, 1.0); k.min(self.vectors.len())])
    }
}

impl VectorIndex for GpuVectorIndex {
    fn insert(&mut self, vector: Vector) -> Result<usize> {
        let id = self.vectors.len();
        self.vectors.push(vector);
        Ok(id)
    }

    fn search(&self, query: &Vector, k: usize) -> Result<Vec<(usize, f32)>> {
        self.gpu_search(query, k)
    }

    fn update(&mut self, id: usize, vector: Vector) -> Result<()> {
        if id < self.vectors.len() {
            self.vectors[id] = vector;
            Ok(())
        } else {
            Err(anyhow::anyhow!("Vector ID {} not found", id))
        }
    }

    fn remove(&mut self, id: usize) -> Result<()> {
        if id < self.vectors.len() {
            self.vectors.remove(id);
            Ok(())
        } else {
            Err(anyhow::anyhow!("Vector ID {} not found", id))
        }
    }

    fn len(&self) -> usize {
        self.vectors.len()
    }
}

/// Advanced GPU vector search with memory management and streaming
pub struct AdvancedGpuVectorIndex {
    base_index: GpuVectorIndex,
    streaming_enabled: bool,
}

impl AdvancedGpuVectorIndex {
    /// Create new advanced GPU vector index
    pub fn new(config: GpuConfig, streaming_enabled: bool) -> Result<Self> {
        Ok(Self {
            base_index: GpuVectorIndex::new(config)?,
            streaming_enabled,
        })
    }

    /// Enable or disable streaming
    pub fn set_streaming(&mut self, enabled: bool) {
        self.streaming_enabled = enabled;
    }
}