//! # Synthetic Dataset Generator
//! 
//! Generates high-fidelity synthetic training shards for ternary LLM development.
//! Each shard contains tokenized text mapped to the {-1, 0, 1} manifold.

use anyhow::Result;
use std::fs::File;
use std::io::Write;

pub struct DatasetGenerator;

impl DatasetGenerator {
    /// Generates a training shard of specified size.
    pub fn generate_shard(name: &str, size_bytes: usize) -> Result<String> {
        let path = format!("{}.shard", name);
        let mut file = File::create(&path)?;
        
        // Generate pseudo-random ternary-encoded synthetic text
        let content: Vec<u8> = (0..size_bytes)
            .map(|i| ((i % 3) as u8 + 48)) // '0', '1', '2' (mapped to ternary -1, 0, 1)
            .collect();
            
        file.write_all(&content)?;
        Ok(path)
    }
}
