//! Document chunking strategies.

use crate::types::Result;

/// Chunking strategy.
#[derive(Debug, Clone)]
pub enum ChunkStrategy {
    /// Fixed token count
    FixedTokens { size: usize, overlap: usize },
    /// Semantic paragraphs
    Semantic,
    /// Fixed character count
    FixedChars { size: usize, overlap: usize },
}

/// Document chunker.
pub struct Chunker {
    strategy: ChunkStrategy,
}

impl Chunker {
    /// Create new chunker with strategy.
    ///
    /// # Arguments
    ///
    /// * `strategy` - Chunking strategy
    ///
    /// # Returns
    ///
    /// New `Chunker`
    pub fn new(strategy: ChunkStrategy) -> Self {
        todo!("Implement Chunker::new")
    }

    /// Chunk document into segments.
    ///
    /// # Arguments
    ///
    /// * `text` - Document text
    ///
    /// # Returns
    ///
    /// Vector of text chunks
    ///
    /// # Errors
    ///
    /// Returns `DatabaseError::IngestError` if chunking fails
    pub fn chunk(&self, text: &str) -> Result<Vec<String>> {
        todo!("Implement Chunker::chunk")
    }

    /// Get chunk metadata (offsets, token counts).
    ///
    /// # Arguments
    ///
    /// * `text` - Document text
    ///
    /// # Returns
    ///
    /// Vector of chunk metadata
    pub fn chunk_with_metadata(&self, text: &str) -> Result<Vec<ChunkMetadata>> {
        todo!("Implement Chunker::chunk_with_metadata")
    }
}

/// Chunk metadata.
#[derive(Debug, Clone)]
pub struct ChunkMetadata {
    pub text: String,
    pub start_offset: usize,
    pub end_offset: usize,
    pub token_count: usize,
}
