/// Discover all functions in project
#[provable_contracts_macros::contract("pmat-core.yaml", equation = "path_exists")]
pub async fn discover_project_functions(project_path: &Path) -> Result<Vec<FunctionId>> {
    eprintln!("\u{1f4c2} Discovering functions in project...");

    let mut function_ids = Vec::new();
    let mut file_count = 0;

    // Use file discovery service for better performance
    use crate::services::file_discovery::{FileDiscoveryConfig, ProjectFileDiscovery};

    let discovery = ProjectFileDiscovery::new(project_path.to_path_buf())
        .with_config(FileDiscoveryConfig::default());

    let files = discovery.discover_files()?;

    for path in files {
        let ext = path.extension().and_then(|e| e.to_str()).unwrap_or("");

        // Only process source files
        if matches!(ext, "rs" | "ts" | "js" | "py" | "c" | "cpp" | "h" | "hpp") {
            file_count += 1;
            let relative_path = path
                .strip_prefix(project_path)
                .unwrap_or(&path)
                .to_string_lossy()
                .to_string();

            // For stub implementation, add common function names
            // In real implementation, would parse AST
            function_ids.push(FunctionId {
                file_path: relative_path.clone(),
                function_name: "main".to_string(),
                line_number: 1,
            });

            function_ids.push(FunctionId {
                file_path: relative_path,
                function_name: "test".to_string(),
                line_number: 10,
            });
        }
    }

    eprintln!("\u{1f4ca} Found {file_count} source files");
    Ok(function_ids)
}
