package host

import (
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/carlosframework/platform/internal/rollout"
	"golang.org/x/sys/unix"
)

func TestPlan14RootFailureLegacySpecialFiles(t *testing.T) {
	for _, kind := range []string{"fifo", "symlink", "regular", "absent"} {
		t.Run(kind, func(t *testing.T) {
			dir := t.TempDir()
			path := filepath.Join(dir, rollout.FailureFile)
			switch kind {
			case "fifo":
				if err := unix.Mkfifo(path, 0600); err != nil {
					t.Fatal(err)
				}
			case "symlink":
				target := filepath.Join(dir, "target")
				if err := os.WriteFile(target, []byte("legacy"), 0600); err != nil {
					t.Fatal(err)
				}
				if err := os.Symlink(target, path); err != nil {
					t.Fatal(err)
				}
			case "regular":
				if err := os.WriteFile(path, []byte("legacy"), 0600); err != nil {
					t.Fatal(err)
				}
			}
			done := make(chan error, 1)
			go func() { _, err := rootFailureLegacy(dir); done <- err }()
			select {
			case err := <-done:
				if (err == nil) != (kind == "regular" || kind == "absent") {
					t.Fatal("unsafe legacy reader", kind, err)
				}
			case <-time.After(time.Second):
				t.Fatal("legacy file blocked root")
			}
		})
	}
}