package models

import "errors"

// Application errors
var (
	// ErrNotFound resource not found
	ErrNotFound = errors.New("resource not found")
	
	// ErrAlreadyExists resource already exists
	ErrAlreadyExists = errors.New("resource already exists")
	
	// ErrValidationFailed validation failed
	ErrValidationFailed = errors.New("validation failed")
	
	// ErrUnauthorized unauthorized access
	ErrUnauthorized = errors.New("unauthorized access")
	
	// ErrForbidden forbidden access
	ErrForbidden = errors.New("forbidden access")
	
	// ErrInternalServer internal server error
	ErrInternalServer = errors.New("internal server error")
	
	// ErrConnectionFailed connection failed
	ErrConnectionFailed = errors.New("connection failed")
	
	// ErrQueryFailed query execution failed
	ErrQueryFailed = errors.New("query execution failed")
	
	// ErrEncryptionFailed encryption/decryption failed
	ErrEncryptionFailed = errors.New("encryption/decryption failed")
	
	// ErrInvalidConfig invalid configuration
	ErrInvalidConfig = errors.New("invalid configuration")
	
	// ErrDatabaseLocked database is locked
	ErrDatabaseLocked = errors.New("database is locked")
	
	// ErrTimeout operation timeout
	ErrTimeout = errors.New("operation timeout")
)

// ErrorCode represents error codes for API responses
type ErrorCode string

const (
	// CodeSuccess successful operation
	CodeSuccess ErrorCode = "SUCCESS"
	
	// CodeNotFound resource not found
	CodeNotFound ErrorCode = "NOT_FOUND"
	
	// CodeValidation validation error
	CodeValidation ErrorCode = "VALIDATION_ERROR"
	
	// CodeUnauthorized unauthorized
	CodeUnauthorized ErrorCode = "UNAUTHORIZED"
	
	// CodeForbidden forbidden
	CodeForbidden ErrorCode = "FORBIDDEN"
	
	// CodeInternal internal error
	CodeInternal ErrorCode = "INTERNAL_ERROR"
	
	// CodeConnection connection error
	CodeConnection ErrorCode = "CONNECTION_ERROR"
	
	// CodeQuery query error
	CodeQuery ErrorCode = "QUERY_ERROR"
	
	// CodeEncryption encryption error
	CodeEncryption ErrorCode = "ENCRYPTION_ERROR"
)