#[async_trait]
impl ContainerRuntime for EmulationRuntime {
    async fn run_container(
        &self,
        image: &str,
        cmd: &[&str],
        env_vars: &[(&str, &str)],
        working_dir: &Path,
        volumes: &[(&Path, &Path)],
    ) -> Result<ContainerOutput, ContainerError> {
        // ... existing code ...
    }

    async fn pull_image(&self, image: &str) -> Result<(), ContainerError> {
        // ... existing code ...
    }

    async fn build_image(&self, dockerfile: &Path, tag: &str) -> Result<(), ContainerError> {
        // ... existing code ...
    }

    async fn prepare_language_environment(
        &self,
        language: &str,
        version: Option<&str>,
        additional_packages: Option<Vec<String>>,
    ) -> Result<String, ContainerError> {
        // For emulation runtime, we'll use a simplified approach
        // that doesn't require building custom images
        let base_image = match language {
            "python" => version.map_or("python:3.11-slim".to_string(), |v| format!("python:{}", v)),
            "node" => version.map_or("node:20-slim".to_string(), |v| format!("node:{}", v)),
            "java" => version.map_or("eclipse-temurin:17-jdk".to_string(), |v| format!("eclipse-temurin:{}", v)),
            "go" => version.map_or("golang:1.21-slim".to_string(), |v| format!("golang:{}", v)),
            "dotnet" => version.map_or("mcr.microsoft.com/dotnet/sdk:7.0".to_string(), |v| format!("mcr.microsoft.com/dotnet/sdk:{}", v)),
            "rust" => version.map_or("rust:latest".to_string(), |v| format!("rust:{}", v)),
            _ => return Err(ContainerError::ContainerStart(format!("Unsupported language: {}", language))),
        };

        // For emulation, we'll just return the base image
        // The actual package installation will be handled during container execution
        Ok(base_image)
    }
} 