use std::{fs, path::Path};

const CRATE_DIR: &str = env!("CARGO_MANIFEST_DIR");

#[test]
fn desktop_packages_have_native_icons_and_cargo_commands() {
    let assets = Path::new(CRATE_DIR).join("assets/app-icons");
    let png = fs::read(assets.join("bds.png")).expect("Linux PNG icon");
    let ico = fs::read(assets.join("bds.ico")).expect("Windows ICO icon");
    let icns = fs::read(assets.join("bds.icns")).expect("macOS ICNS icon");

    assert_eq!(&png[..8], b"\x89PNG\r\n\x1a\n");
    assert_eq!(u32::from_be_bytes(png[16..20].try_into().unwrap()), 1024);
    assert_eq!(u32::from_be_bytes(png[20..24].try_into().unwrap()), 1024);
    assert_eq!(&ico[..4], &[0, 0, 1, 0]);
    assert!(u16::from_le_bytes(ico[4..6].try_into().unwrap()) >= 6);
    assert_eq!(&icns[..4], b"icns");

    let manifest = fs::read_to_string(Path::new(CRATE_DIR).join("Cargo.toml")).unwrap();
    for required in [
        "[package.metadata.packager]",
        "assets/app-icons/bds.png",
        "assets/app-icons/bds.ico",
        "assets/app-icons/bds.icns",
        "signing-identity = \"-\"",
    ] {
        assert!(manifest.contains(required), "missing {required}");
    }

    let cargo_config = fs::read_to_string(Path::new(CRATE_DIR).join("../../.cargo/config.toml"))
        .expect("Cargo packaging aliases");
    for alias in ["bundle-macos", "bundle-windows", "bundle-linux"] {
        assert!(cargo_config.contains(alias), "missing cargo {alias}");
    }

    let main = fs::read_to_string(Path::new(CRATE_DIR).join("src/main.rs")).unwrap();
    assert!(main.contains("assets/app-icons/bds.png"));

    let build = fs::read_to_string(Path::new(CRATE_DIR).join("build.rs")).unwrap();
    assert!(build.contains("set_icon(\"assets/app-icons/bds.ico\")"));
}