package store

import (
	"github.com/tendermint/iavl"
)

// Implements IterKVStore
type IAVLStore struct {
	//
}

// XXX GUT THIS AND TURN IT INTO AN IAVLSTORE LOADER
func loadState(dbName string, cacheSize int) (*sm.State, error) {
	// memory backed case, just for testing
	if dbName == "" {
		tree := iavl.NewVersionedTree(0, dbm.NewMemDB())
		return sm.NewState(tree), nil
	}

	// Expand the path fully
	dbPath, err := filepath.Abs(dbName)
	if err != nil {
		return nil, errors.ErrInternal("Invalid Database Name")
	}

	// Some external calls accidently add a ".db", which is now removed
	dbPath = strings.TrimSuffix(dbPath, path.Ext(dbPath))

	// Split the database name into it's components (dir, name)
	dir := path.Dir(dbPath)
	name := path.Base(dbPath)

	// Open database called "dir/name.db", if it doesn't exist it will be created
	db := dbm.NewDB(name, dbm.LevelDBBackendStr, dir)
	tree := iavl.NewVersionedTree(cacheSize, db)
	if err = tree.Load(); err != nil {
		return nil, errors.ErrInternal("Loading tree: " + err.Error())
	}

	return sm.NewState(tree), nil
}