use super::Directory;
use dever::compiler::{project::Project, toolchain::BuildTarget};
use std::path::Path;
use std::process::{Command, Output};

mod packaging;
mod skill;

fn cli(arguments: &[&str]) -> Output {
    Command::new(env!("CARGO_BIN_EXE_dever"))
        .args(arguments)
        .output()
        .unwrap()
}

fn success(output: Output) -> String {
    assert!(
        output.status.success(),
        "{}",
        String::from_utf8_lossy(&output.stderr)
    );
    String::from_utf8(output.stdout).unwrap()
}

#[test]
fn new_creates_plain_source_and_separate_docs_without_overwriting() {
    let directory = Directory::new();
    for name in ["plain", "second"] {
        let root = directory.0.join(name);
        let text = root.to_str().unwrap();
        let arguments = vec!["new", text];
        success(cli(&arguments));
        let suffix = "dever";
        assert!(
            root.join(format!("module/hello/greeting/app.{suffix}"))
                .is_file()
        );
        assert!(
            root.join(format!("test/hello/greeting/greet.{suffix}"))
                .is_file()
        );
        assert!(root.join("module/hello/greeting/README.md").is_file());
        assert!(root.join("module/hello/greeting/doc/greeting.md").is_file());
        let project = Project::load(&root).unwrap();
        assert_eq!(project.check().unwrap().commands.len(), 1);
        success(cli(&["check", text]));
        success(cli(&["fmt", text, "--check"]));
        let snapshot = std::fs::read(root.join("README.md")).unwrap();
        assert!(!cli(&arguments).status.success());
        assert_eq!(std::fs::read(root.join("README.md")).unwrap(), snapshot);
    }
    let path = directory.0.join("invalid");
    assert!(
        !cli(&["new", path.to_str().unwrap(), "--markdown"])
            .status
            .success()
    );
    assert!(!path.exists());
    let link = directory.0.join("link");
    std::os::unix::fs::symlink(directory.0.join("plain"), &link).unwrap();
    let rejected = cli(&["new", link.to_str().unwrap()]);
    assert!(!rejected.status.success());
    assert!(String::from_utf8_lossy(&rejected.stderr).contains(link.to_str().unwrap()));
    assert_eq!(
        std::fs::read_link(&link).unwrap(),
        directory.0.join("plain")
    );
}

#[test]
fn template_runs_tests_and_builds_a_real_native_executable_for_the_selected_target() {
    let directory = Directory::new();
    let root = directory.0.join("app");
    dever::compiler::project::create(&root).unwrap();
    let root = root.to_str().unwrap();
    success(cli(&["test", root]));
    let result = success(cli(&[
        "run",
        root,
        "--",
        "hello.greeting.greet",
        r#"{"name":"Dever"}"#,
    ]));
    assert_eq!(
        serde_json::from_str::<serde_json::Value>(&result).unwrap()["data"],
        "Hello, Dever"
    );
    let binary = directory.0.join("hello");
    success(cli(&[
        "build",
        root,
        "--output",
        binary.to_str().unwrap(),
        "--target",
        BuildTarget::host().unwrap().name(),
    ]));
    BuildTarget::host()
        .unwrap()
        .validate_executable(&std::fs::read(&binary).unwrap())
        .unwrap();
    let result = success(
        Command::new(&binary)
            .args(["hello.greeting.greet", r#"{"name":"native"}"#])
            .output()
            .unwrap(),
    );
    assert_eq!(
        serde_json::from_str::<serde_json::Value>(&result).unwrap()["data"],
        "Hello, native"
    );
    let before = std::fs::read(&binary).unwrap();
    assert!(
        !cli(&["build", root, "--output", binary.to_str().unwrap()])
            .status
            .success()
    );
    assert_eq!(std::fs::read(&binary).unwrap(), before);
    assert!(
        !cli(&["run", root, "--target", "linux-aarch64"])
            .status
            .success()
    );
    assert!(
        !cli(&[
            "build",
            root,
            "--output",
            binary.to_str().unwrap(),
            "--target",
            "unsupported"
        ])
        .status
        .success()
    );
}

#[test]
fn elf_validation_checks_architecture_and_executable_type() {
    let mut header = vec![0_u8; 64];
    header[..7].copy_from_slice(b"\x7fELF\x02\x01\x01");
    header[16..18].copy_from_slice(&2_u16.to_le_bytes());
    header[18..20].copy_from_slice(&183_u16.to_le_bytes());
    assert!(
        BuildTarget::LinuxAarch64
            .validate_executable(&header)
            .is_ok()
    );
    assert!(
        BuildTarget::LinuxX86_64
            .validate_executable(&header)
            .is_err()
    );
    header[16..18].copy_from_slice(&1_u16.to_le_bytes());
    assert!(
        BuildTarget::LinuxAarch64
            .validate_executable(&header)
            .is_err()
    );
    assert!(
        BuildTarget::LinuxAarch64
            .validate_executable(b"short")
            .is_err()
    );
    assert!(BuildTarget::parse("linux-x86_64").is_ok());
    assert!(BuildTarget::parse("esp32").is_err());
}

fn copy_tree(source: &Path, destination: &Path) {
    if source.is_dir() {
        std::fs::create_dir_all(destination).unwrap();
        for entry in std::fs::read_dir(source)
            .unwrap_or_else(|error| panic!("{}: {error}", source.display()))
        {
            let entry = entry.unwrap();
            copy_tree(&entry.path(), &destination.join(entry.file_name()));
        }
    } else {
        std::fs::create_dir_all(destination.parent().unwrap()).unwrap();
        std::fs::copy(source, destination).unwrap();
    }
}