package hostbox

import (
	"github.com/carlosframework/platform/internal/rootstate"
	"github.com/carlosframework/platform/internal/safefile"
	"os"
)

func sameInventoryIdentity(a, b rootstate.FileIdentity) bool {
	if a.Boot == "" || b.Boot == "" {
		return false
	}
	if a.Handle == "" || b.Handle == "" {
		return a.Boot == b.Boot && a == b
	}
	return a.Same(b)
}

func VerifyInventoryFile(f *os.File, e StopInventoryEntry) error {
	info, err := f.Stat()
	if err != nil {
		return err
	}
	if !info.IsDir() && !info.Mode().IsRegular() {
		return ErrTypedInventory
	}
	now, err := rootstate.ObjectIdentity(f)
	if err != nil {
		return err
	}
	if e.Identity.Device != e.Device || e.Identity.Inode != e.Inode || e.Identity.Mode&0170000 != e.Type || !sameInventoryIdentity(e.Identity, now) {
		return ErrChanged
	}
	return nil
}

func OpenInventoryFile(path string) (*os.File, error) {
	f, err := safefile.OpenDir(path)
	if err != nil {
		return safefile.OpenFile(path, os.O_RDONLY, 0)
	}
	return f, nil
}