package main

import (
	"fmt"
	"os"
	"path/filepath"
)

// Compatibility cleanup belongs to the shared reset path, never the UI.
// Current frontends are stateless. Keep this for upgrades from SQLite builds.
func cleanupLegacyFrontendState() error {
	for _, path := range []string{"/var/lib/teraweb/frontend.db", "/var/lib/tera-clone-demo-web/teraclone.db"} {
		if err := removeLegacyDatabase(path); err != nil {
			return err
		}
	}
	return nil
}

func removeLegacyDatabase(path string) error {
	parent := filepath.Dir(path)
	resolved, err := filepath.EvalSymlinks(parent)
	if os.IsNotExist(err) {
		return nil
	}
	if err != nil {
		return err
	}
	if resolved != parent {
		return fmt.Errorf("refusing redirected frontend state directory: %s", parent)
	}
	for _, suffix := range []string{"", "-wal", "-shm", "-journal"} {
		target := path + suffix
		info, err := os.Lstat(target)
		if os.IsNotExist(err) {
			continue
		}
		if err != nil {
			return err
		}
		if !info.Mode().IsRegular() {
			return fmt.Errorf("refusing non-regular frontend state: %s", target)
		}
		if err := os.Remove(target); err != nil {
			return err
		}
	}
	return nil
}