package rosa

import (
	"slices"

	"hakurei.app/internal/pkg"
)

// MuslAttr holds the attributes that will be applied to musl.
type MuslAttr struct {
	// Install headers only.
	Headers bool
	// Environment variables concatenated with defaults.
	Env []string
	// Dependencies concatenated with defaults.
	Extra []pkg.Artifact
}

// NewMusl returns a [pkg.Artifact] containing an installation of musl libc.
func (t Toolchain) NewMusl(attr *MuslAttr) pkg.Artifact {
	const (
		version  = "1.2.5"
		checksum = "y6USdIeSdHER_Fw2eT2CNjqShEye85oEg2jnOur96D073ukmIpIqDOLmECQroyDb"
	)

	if attr == nil {
		attr = new(MuslAttr)
	}

	target := "install"
	script := `
mv -v /work/lib/* /work/system/lib
rmdir -v /work/lib/
`
	if attr.Headers {
		target = "install-headers"
		script = ""
	}

	extra := []pkg.Artifact{
		t.NewMake(),
	}
	if t == toolchainStage3 {
		extra = nil
	}

	return t.New("musl-"+version, slices.Concat(
		attr.Extra,
		extra,
	), nil, slices.Concat([]string{
		"ROSA_MUSL_TARGET=" + target,
	}, attr.Env), `
# expected to be writable in copies
chmod -R +w /usr/src/musl/

cd "$(mktemp -d)"
/usr/src/musl/configure \
	--prefix=/system \
	--target="${ROSA_TRIPLE}"
make "-j$(nproc)" DESTDIR=/work "${ROSA_MUSL_TARGET}"
`+script, pkg.Path(AbsUsrSrc.Append("musl"), true, pkg.NewHTTPGetTar(
		nil,
		"https://musl.libc.org/releases/musl-"+version+".tar.gz",
		mustDecode(checksum),
		pkg.TarGzip,
	)))
}