//! 中间归档只检查文件属性；读取计数与异常文件覆盖不启动 Go 工具。

use super::*;
use std::os::unix::fs::symlink;

fn stage() -> Stage {
    let root = std::env::temp_dir().join(format!(
        "dever-go-output-{}-{}",
        std::process::id(),
        std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .unwrap()
            .as_nanos()
    ));
    fs::DirBuilder::new().mode(0o700).create(&root).unwrap();
    Stage {
        root,
        resources: BTreeMap::new(),
        written: 0,
        started: Instant::now(),
    }
}

#[test]
fn go_intermediate_output_checks_metadata_without_reading_archive() {
    let stage = stage();
    let path = stage.root.join("package.a");
    let length = 8 * 1024 * 1024;
    fs::File::create(&path).unwrap().set_len(length).unwrap();
    let read_chars = || {
        fs::read_to_string("/proc/thread-self/io")
            .unwrap()
            .lines()
            .find_map(|line| line.strip_prefix("rchar: "))
            .unwrap()
            .parse::<u64>()
            .unwrap()
    };
    let before = read_chars();
    drop(stage.output(&path).unwrap());
    let consumed = read_chars() - before;
    eprintln!("go intermediate: fixture=sparse-zero bytes={length} rchar={consumed}");
    assert!(
        consumed < 4096,
        "read {consumed} bytes for a metadata check"
    );
    assert_eq!(fs::metadata(path).unwrap().len(), length);
}

#[test]
fn go_output_rejects_links_empty_special_and_oversized_files() {
    let stage = stage();
    let path = stage.root.join("output");
    fs::write(&path, b"archive").unwrap();
    drop(stage.output(&path).unwrap());
    let link = stage.root.join("symbolic");
    symlink(&path, &link).unwrap();
    assert!(stage.output(&link).is_err());
    fs::remove_file(link).unwrap();
    let link = stage.root.join("hard");
    fs::hard_link(&path, &link).unwrap();
    assert!(stage.output(&path).is_err());
    fs::remove_file(link).unwrap();
    assert!(stage.output(&stage.root).is_err());
    fs::File::create(&path).unwrap();
    assert!(stage.output(&path).is_err());
    fs::File::create(&path)
        .unwrap()
        .set_len(128 * 1024 * 1024 + 1)
        .unwrap();
    assert!(stage.output(&path).is_err());
    fs::remove_file(&path).unwrap();
    assert!(stage.output(&path).is_err());
}