//! Example of instantiating a shell and calling a shell function in it.

use anyhow::Result;

async fn instantiate_shell() -> Result<brush_core::Shell> {
	let shell = brush_core::Shell::builder().build().await?;
	Ok(shell)
}

async fn define_func(shell: &mut brush_core::Shell) -> Result<()> {
	let script = r#"hello() { echo "Hello, world: $@"; return 42; }
"#;

	let result = shell
		.run_string(script, &brush_core::SourceInfo::default(), &shell.default_exec_params())
		.await?;

	eprintln!("[Function definition result: {}]", result.is_success());

	Ok(())
}

async fn run_func(shell: &mut brush_core::Shell, suppress_stdout: bool) -> Result<()> {
	let mut params = shell.default_exec_params();

	if suppress_stdout {
		params.set_fd(brush_core::openfiles::OpenFiles::STDOUT_FD, brush_core::openfiles::null()?);
	}

	let result = shell
		.invoke_function("hello", std::iter::once("arg"), &params)
		.await?;

	eprintln!("[Function invocation result: {result}]");

	Ok(())
}

async fn run(suppress_stdout: bool) -> Result<()> {
	let mut shell = instantiate_shell().await?;

	define_func(&mut shell).await?;

	for (name, _) in shell.funcs().iter() {
		eprintln!("[Found function: {name}]");
	}

	run_func(&mut shell, suppress_stdout).await?;

	Ok(())
}

fn main() -> Result<()> {
	const SUPPRESS_STDOUT: bool = true;

	// Construct a runtime for us to run async code on.
	let rt = tokio::runtime::Builder::new_multi_thread()
		.enable_all()
		.build()?;

	rt.block_on(run(SUPPRESS_STDOUT))?;

	Ok(())
}