//@ run-pass
// Test StableMIR behavior when different results are given

//@ ignore-stage1
//@ ignore-cross-compile
//@ ignore-remote
//@ edition: 2021

#![feature(rustc_private)]
#![feature(assert_matches)]

extern crate rustc_middle;

extern crate rustc_driver;
extern crate rustc_interface;
#[macro_use]
extern crate rustc_public;

use std::io::Write;

/// This test will generate and analyze a dummy crate using the stable mir.
/// For that, it will first write the dummy crate into a file.
/// Then it will create a `RustcPublic` using custom arguments and then
/// it will run the compiler.
fn main() {
    let path = "input_compilation_result_test.rs";
    generate_input(&path).unwrap();
    let args = &["rustc".to_string(), path.to_string()];
    test_continue(args);
    test_break(args);
    test_failed(args);
    test_skipped(args);
    test_captured(args)
}

fn test_continue(args: &[String]) {
    let result = run!(args, || ControlFlow::Continue::<(), bool>(true));
    assert_eq!(result, Ok(true));
}

fn test_break(args: &[String]) {
    let result = run!(args, || ControlFlow::Break::<bool, i32>(false));
    assert_eq!(result, Err(rustc_public::CompilerError::Interrupted(false)));
}

#[allow(unreachable_code)]
fn test_skipped(args: &[String]) {
    let mut args = args.to_vec();
    args.push("--version".to_string());
    let result = run!(&args, || unreachable!() as ControlFlow<()>);
    assert_eq!(result, Err(rustc_public::CompilerError::Skipped));
}

#[allow(unreachable_code)]
fn test_failed(args: &[String]) {
    let mut args = args.to_vec();
    args.push("--cfg=broken".to_string());
    let result = run!(&args, || unreachable!() as ControlFlow<()>);
    assert_eq!(result, Err(rustc_public::CompilerError::Failed));
}

/// Test that we are able to pass a closure and set the return according to the captured value.
fn test_captured(args: &[String]) {
    let captured = "10".to_string();
    let result = run!(args, || ControlFlow::Continue::<(), usize>(captured.len()));
    assert_eq!(result, Ok(captured.len()));
}

fn generate_input(path: &str) -> std::io::Result<()> {
    let mut file = std::fs::File::create(path)?;
    write!(
        file,
        r#"
    // This should trigger a compilation failure when enabled.
    #[cfg(broken)]
    mod broken_mod {{
        fn call_invalid() {{
            invalid_fn();
        }}
    }}

    fn main() {{}}
    "#
    )?;
    Ok(())
}