package errors

import (
	stderrors "errors"
	"fmt"
)

// Is reports whether any error in err's chain matches target.
var Is = stderrors.Is

// As finds the first error in err's chain that matches target, and if so, sets
// target to that error value and returns true.
var As = stderrors.As

// Unwrap returns the result of calling the Unwrap method on err, if err's
// type contains an Unwrap method returning error.
// Otherwise, Unwrap returns nil.
var Unwrap = stderrors.Unwrap

// Standard errors that can be used across packages
var (
	ErrNotFound          = stderrors.New("resource not found")
	ErrInvalidInput      = stderrors.New("invalid input")
	ErrUnauthorized      = stderrors.New("unauthorized")
	ErrInternalServer    = stderrors.New("internal server error")
	ErrDatabaseOperation = stderrors.New("database operation failed")
)

// DatabaseError represents a database-related error
type DatabaseError struct {
	Operation string
	Err       error
}

func (e *DatabaseError) Error() string {
	return fmt.Sprintf("database error during %s: %v", e.Operation, e.Err)
}

func (e *DatabaseError) Unwrap() error {
	return e.Err
}

// NewDatabaseError creates a new DatabaseError
func NewDatabaseError(operation string, err error) *DatabaseError {
	return &DatabaseError{
		Operation: operation,
		Err:       err,
	}
}

// AuthError represents an authentication-related error
type AuthError struct {
	Action string
	Err    error
}

func (e *AuthError) Error() string {
	return fmt.Sprintf("authentication error during %s: %v", e.Action, e.Err)
}

func (e *AuthError) Unwrap() error {
	return e.Err
}

// NewAuthError creates a new AuthError
func NewAuthError(action string, err error) *AuthError {
	return &AuthError{
		Action: action,
		Err:    err,
	}
}

// StorageError represents a storage-related error
type StorageError struct {
	Operation string
	Bucket    string
	Err       error
}

func (e *StorageError) Error() string {
	return fmt.Sprintf("storage error during %s on bucket %s: %v", e.Operation, e.Bucket, e.Err)
}

func (e *StorageError) Unwrap() error {
	return e.Err
}

// NewStorageError creates a new StorageError
func NewStorageError(operation, bucket string, err error) *StorageError {
	return &StorageError{
		Operation: operation,
		Bucket:    bucket,
		Err:       err,
	}
}

// ConfigError represents a configuration-related error
type ConfigError struct {
	Section string
	Err     error
}

func (e *ConfigError) Error() string {
	return fmt.Sprintf("configuration error in %s: %v", e.Section, e.Err)
}

func (e *ConfigError) Unwrap() error {
	return e.Err
}

// NewConfigError creates a new ConfigError
func NewConfigError(section string, err error) *ConfigError {
	return &ConfigError{
		Section: section,
		Err:     err,
	}
}