package walletdb

import (
	"errors"
)

// Errors that can occur during driver registration.
var (
	// ErrDbTypeRegistered is returned when two different database drivers attempt to register with the name database
	// type.
	ErrDbTypeRegistered = errors.New("database type already registered")
)

// Errors that the various database functions may return.
var (
	// ErrDbUnknownType is returned when there is no driver registered for the specified database type.
	ErrDbUnknownType = errors.New("unknown database type")
	// ErrDbDoesNotExist is returned when open is called for a database that does not exist.
	ErrDbDoesNotExist = errors.New("database does not exist")
	// ErrDbExists is returned when create is called for a database that already exists.
	ErrDbExists = errors.New("database already exists")
	// ErrDbNotOpen is returned when a database instance is accessed before it is opened or after it is closed.
	ErrDbNotOpen = errors.New("database not open")
	// ErrDbAlreadyOpen is returned when open is called on a database that is already open.
	ErrDbAlreadyOpen = errors.New("database already open")
	// ErrInvalid is returned if the specified database is not valid.
	ErrInvalid = errors.New("invalid database")
)

// Errors that can occur when beginning or committing a transaction.
var (
	// ErrTxClosed is returned when attempting to commit or rollback a transaction that has already had one of those
	// operations performed.
	ErrTxClosed = errors.New("tx closed")
	// ErrTxNotWritable is returned when an operation that requires write access to the database is attempted against a
	// read-only transaction.
	ErrTxNotWritable = errors.New("tx not writable")
)

// Errors that can occur when putting or deleting a value or bucket.
var (
	// ErrBucketNotFound is returned when trying to access a bucket that has
	// not been created yet.
	ErrBucketNotFound = errors.New("bucket not found")
	// ErrBucketExists is returned when creating a bucket that already exists.
	ErrBucketExists = errors.New("bucket already exists")
	// ErrBucketNameRequired is returned when creating a bucket with a blank name.
	ErrBucketNameRequired = errors.New("bucket name required")
	// ErrKeyRequired is returned when inserting a zero-length key.
	ErrKeyRequired = errors.New("key required")
	// ErrKeyTooLarge is returned when inserting a key that is larger than MaxKeySize.
	ErrKeyTooLarge = errors.New("key too large")
	// ErrValueTooLarge is returned when inserting a value that is larger than MaxValueSize.
	ErrValueTooLarge = errors.New("value too large")
	// ErrIncompatibleValue is returned when trying create or delete a bucket on an existing non-bucket key or when
	// trying to create or delete a non-bucket key on an existing bucket key.
	ErrIncompatibleValue = errors.New("incompatible value")
)