package errors

import (
	"fmt"
)

// Error codes
const (
	ErrHostNotFound        = "HOST_NOT_FOUND"
	ErrAuthFailed          = "AUTH_FAILED"
	ErrConnectionTimeout   = "CONNECTION_TIMEOUT"
	ErrInvalidConfig       = "INVALID_CONFIG"
	ErrKeyNotFound         = "KEY_NOT_FOUND"
	ErrPermissionDenied    = "PERMISSION_DENIED"
	ErrFileCorrupted       = "FILE_CORRUPTED"
	ErrInvalidCredentials  = "INVALID_CREDENTIALS"
)

// AppError represents an application error with code, message, cause, and hints
type AppError struct {
	Code    string
	Message string
	Cause   error
	Hints   []string
}

// Error implements the error interface
func (e *AppError) Error() string {
	if e.Cause != nil {
		return fmt.Sprintf("[%s] %s: %v", e.Code, e.Message, e.Cause)
	}
	return fmt.Sprintf("[%s] %s", e.Code, e.Message)
}

// Unwrap returns the underlying cause for use with errors.Is/errors.As
func (e *AppError) Unwrap() error {
	return e.Cause
}

// NewAppError creates a new application error
func NewAppError(code, message string, cause error, hints []string) *AppError {
	return &AppError{
		Code:    code,
		Message: message,
		Cause:   cause,
		Hints:   hints,
	}
}