package platform

import (
	"runtime"
	"testing"
)

func TestDetectLinuxDistro(t *testing.T) {
	if runtime.GOOS != "linux" {
		t.Skip("Linux-only path")
	}

	t.Run("os-release ID maps to family", func(t *testing.T) {
		withOSRelease(t, "ID=opensuse-tumbleweed\nID_LIKE=\"opensuse suse\"\n")
		id, family := detectLinuxDistro()
		if id != "opensuse-tumbleweed" {
			t.Errorf("detectLinuxDistro() id = %q, want opensuse-tumbleweed", id)
		}
		if family != "suse" {
			t.Errorf("detectLinuxDistro() family = %q, want suse", family)
		}
	})

	t.Run("quoted ID is unquoted", func(t *testing.T) {
		withOSRelease(t, "ID=\"cachyos\"\n")
		id, family := detectLinuxDistro()
		if id != "cachyos" || family != "arch" {
			t.Errorf("detectLinuxDistro() = (%q, %q), want (cachyos, arch)", id, family)
		}
	})

	t.Run("derivative resolves through ID_LIKE", func(t *testing.T) {
		withOSRelease(t, "ID=myowndistro\nID_LIKE=\"debian\"\n")
		id, family := detectLinuxDistro()
		if id != "myowndistro" || family != "debian" {
			t.Errorf("detectLinuxDistro() = (%q, %q), want (myowndistro, debian)", id, family)
		}
	})

	t.Run("host detection returns a family", func(t *testing.T) {
		// Against the real host files: every supported CI host is Linux with
		// os-release present, so detection must succeed.
		id, family := detectLinuxDistro()
		if id == "" {
			t.Error("detectLinuxDistro() returned an empty ID on a Linux host")
		}
		if family == "" {
			t.Error("detectLinuxDistro() returned an empty family on a Linux host")
		}
	})
}

func TestGetLinuxDistroFamily(t *testing.T) {
	if runtime.GOOS != "linux" {
		t.Skip("Linux-only path")
	}

	t.Run("from os-release", func(t *testing.T) {
		withOSRelease(t, "ID=fedora\n")
		if got := GetLinuxDistroFamily(); got != "rhel" {
			t.Errorf("GetLinuxDistroFamily() = %q, want rhel", got)
		}
	})

	t.Run("missing os-release returns empty", func(t *testing.T) {
		withOSRelease(t, "") // file with no ID line
		if got := GetLinuxDistroFamily(); got != "" {
			t.Errorf("GetLinuxDistroFamily() = %q, want empty", got)
		}
	})
}