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 := `
mkdir -p /work/system/bin
COMPAT_LINKER_NAME="ld-musl-$(uname -m).so.1"
ln -vs ../lib/libc.so /work/system/bin/linker
ln -vs ../lib/libc.so /work/system/bin/ldd
ln -vs libc.so "/work/system/lib/${COMPAT_LINKER_NAME}"
rm -v "/work/lib/${COMPAT_LINKER_NAME}"
rmdir -v /work/lib
`
	if attr.Headers {
		target = "install-headers"
		script = ""
	}

	return t.New("musl-"+version, false, stage3Concat(t, attr.Extra,
		t.Load(Make),
	), 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,
	)))
}