use anyhow::{anyhow, Result};
use std::path::{Path, PathBuf};

/// Helper to resolve import paths (e.g., converting './utils' to './utils.ts').
pub fn resolve_import(base_path: &Path, import_str: &str) -> Result<PathBuf> {
    let mut path = base_path.parent().unwrap().join(import_str);
    
    // Auto-append extensions if missing
    if !path.exists() {
        if path.with_extension("ts").exists() {
            path.set_extension("ts");
        } else if path.with_extension("js").exists() {
            path.set_extension("js");
        }
    }

    if !path.exists() {
        return Err(anyhow!("Cannot resolve import '{}' from {:?}", import_str, base_path));
    }
    
    Ok(path.canonicalize()?)
}