//! A real git component pushes an incompressible commit through the hook to native git's HTTP backend.
use sausage::{
    exec::{Command, Exec, Options},
    process::Runtime,
    world::World,
};
use std::{
    io::Write,
    path::Path,
    process::Stdio,
    sync::{Arc, OnceLock},
};
fn git(cwd: &Path, args: &[&str]) {
    assert!(
        std::process::Command::new("git")
            .args(args)
            .current_dir(cwd)
            .status()
            .unwrap()
            .success()
    );
}
#[tokio::test]
async fn several_mb_git_push() {
    static BUILT: OnceLock<std::path::PathBuf> = OnceLock::new();
    let component = BUILT.get_or_init(|| {
        let target = Path::new(env!("CARGO_TARGET_TMPDIR")).join("hook-git");
        let userland = Path::new(env!("CARGO_MANIFEST_DIR")).join("../userland");
        if !userland.join("cwd-init/init.o").is_file() {
            assert!(
                std::process::Command::new("nu")
                    .args(["--no-config-file", "cwd-init/build.nu"])
                    .current_dir(&userland)
                    .status()
                    .unwrap()
                    .success()
            );
        }
        let manifest = userland.join("Cargo.toml");
        assert!(
            std::process::Command::new("cargo")
                .args(["build", "--release", "-p", "git", "--manifest-path"])
                .arg(manifest)
                .current_dir(&userland)
                .args(["--target", "wasm32-wasip2", "--target-dir"])
                .arg(&target)
                .args(["-j", "2", "--locked"])
                .status()
                .unwrap()
                .success()
        );
        target.join("wasm32-wasip2/release/git.wasm")
    });
    let temp = tempfile::tempdir().unwrap();
    let world = World::open(temp.path()).unwrap();
    let root = temp.path().join("world");
    std::fs::create_dir_all(root.join("bin")).unwrap();
    std::fs::copy(component, root.join("bin/git.wasm")).unwrap();
    let repo = root.join("repo");
    std::fs::create_dir_all(&repo).unwrap();
    git(&repo, &["init", "-b", "main"]);
    let mut data = vec![0; 4 * 1024 * 1024];
    openssl::rand::rand_bytes(&mut data).unwrap();
    std::fs::write(repo.join("large"), data).unwrap();
    git(&repo, &["add", "large"]);
    git(
        &repo,
        &[
            "-c",
            "user.name=Test",
            "-c",
            "user.email=test@example.com",
            "commit",
            "-m",
            "large commit",
        ],
    );
    let remote = temp.path().join("remote");
    std::fs::create_dir_all(&remote).unwrap();
    git(&remote, &["init", "--bare", "destination.git"]);
    git(
        &remote.join("destination.git"),
        &["config", "http.receivepack", "true"],
    );
    let listener = tokio::net::TcpListener::bind("127.0.0.1:0").await.unwrap();
    let port = listener.local_addr().unwrap().port();
    git(
        &repo,
        &[
            "remote",
            "add",
            "origin",
            &format!("http://127.0.0.1:{port}/destination.git"),
        ],
    );
    let uploaded = Arc::new(std::sync::atomic::AtomicUsize::new(0));
    let counter = uploaded.clone();
    let server = tokio::spawn(async move {
        loop {
            let (socket, _) = listener.accept().await.unwrap();
            let remote = remote.clone();
            let counter = counter.clone();
            let service =
                hyper::service::service_fn(move |request: http::Request<hyper::body::Incoming>| {
                    let remote = remote.clone();
                    let counter = counter.clone();
                    async move {
                        use http_body_util::{BodyExt, Full};
                        let (parts, body) = request.into_parts();
                        let body = body.collect().await.unwrap().to_bytes();
                        counter.fetch_add(body.len(), std::sync::atomic::Ordering::Relaxed);
                        let response = tokio::task::spawn_blocking(move || {
                            let mut process = std::process::Command::new("git")
                                .arg("http-backend")
                                .env("GIT_PROJECT_ROOT", remote)
                                .env("GIT_HTTP_EXPORT_ALL", "1")
                                .env("REQUEST_METHOD", parts.method.as_str())
                                .env("PATH_INFO", parts.uri.path())
                                .env("QUERY_STRING", parts.uri.query().unwrap_or(""))
                                .env(
                                    "CONTENT_TYPE",
                                    parts
                                        .headers
                                        .get("content-type")
                                        .map(|h| h.to_str().unwrap())
                                        .unwrap_or(""),
                                )
                                .env("CONTENT_LENGTH", body.len().to_string())
                                .stdin(Stdio::piped())
                                .stdout(Stdio::piped())
                                .spawn()
                                .unwrap();
                            let mut stdin = process.stdin.take().unwrap();
                            let output = std::thread::scope(|scope| {
                                scope.spawn(move || {
                                    stdin.write_all(&body).unwrap();
                                });
                                process.wait_with_output().unwrap()
                            });
                            assert!(output.status.success());
                            let split = output
                                .stdout
                                .windows(4)
                                .position(|b| b == b"\r\n\r\n")
                                .unwrap();
                            let headers = std::str::from_utf8(&output.stdout[..split]).unwrap();
                            let mut response = http::Response::builder();
                            for line in headers.split("\r\n") {
                                let (name, value) = line.split_once(':').unwrap();
                                if name.eq_ignore_ascii_case("status") {
                                    response = response.status(
                                        value
                                            .trim()
                                            .split(' ')
                                            .next()
                                            .unwrap()
                                            .parse::<u16>()
                                            .unwrap(),
                                    );
                                } else {
                                    response = response.header(name, value.trim());
                                }
                            }
                            response
                                .body(Full::new(bytes::Bytes::copy_from_slice(
                                    &output.stdout[split + 4..],
                                )))
                                .unwrap()
                        })
                        .await
                        .unwrap();
                        Ok::<_, std::convert::Infallible>(response)
                    }
                });
            hyper::server::conn::http1::Builder::new()
                .keep_alive(false)
                .serve_connection(hyper_util::rt::TokioIo::new(socket), service)
                .await
                .unwrap();
        }
    });
    let runtime = Runtime::new(world).unwrap();
    let mut output = Vec::new();
    let code = runtime
        .exec(
            Command::Argv(vec![
                "/bin/git.wasm".into(),
                "push".into(),
                "origin".into(),
                "main".into(),
            ]),
            Options {
                cwd: "/repo".into(),
                timeout: Some(std::time::Duration::from_secs(60)),
                ..Default::default()
            },
            &mut |_, b| output.extend_from_slice(b),
        )
        .await
        .unwrap();
    server.abort();
    assert_eq!(code, 0, "{}", String::from_utf8_lossy(&output));
    assert!(uploaded.load(std::sync::atomic::Ordering::Relaxed) > 3 * 1024 * 1024);
    git(
        &temp.path().join("remote/destination.git"),
        &["cat-file", "-e", "refs/heads/main:large"],
    );
}