use crate::error::Result;
use crate::graph::OnnxGraph;
use crate::passes::OptimizationPass;

/// Constant folding pass
/// Evaluates constant expressions at compile time
pub struct ConstantFoldingPass;

impl OptimizationPass for ConstantFoldingPass {
    fn name(&self) -> &str {
        "constant_folding"
    }

    fn apply(&self, _graph: &mut OnnxGraph) -> Result<bool> {
        // For now, this is a placeholder
        // Full implementation would:
        // 1. Identify nodes whose all inputs are constants
        // 2. Evaluate those nodes using ONNX Runtime
        // 3. Replace the nodes with constant tensors
        // 4. Add the results to initializers

        log::info!("Constant folding pass (placeholder - not yet implemented)");
        Ok(false)
    }
}
