// ------------------------------------------------------------------------
//   Project active2
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  err_cause.go
//   Created by DEV
//   Modified   23/03/2024
//
//   Copyright 2024 activething.com 
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------

package errs

import "errors"

type (

	ErrCause 	struct {
		error
		cause 	error
	}
)


func NewErrCause (err error, cause error) *ErrCause {
	if err == nil || cause == nil {
		return nil
	}
	return &ErrCause{
		error: err,
		cause: cause,
	}
}



func (e ErrCause) Cause () error {
	return e.cause }

func (e ErrCause) Unwrap() error {
	return e.error }

func (e ErrCause) Is (target error) bool {
	if target == nil {
		return false
	}
	return errors.Is (e.error,target) || errors.Is(e.cause,target)
}

func (e ErrCause) As (target any) bool {
	if target == nil {
		return false
	}
	return errors.As(e.error, target) || errors.As(e.cause, target)
}


func (e ErrCause) StackTrace () StackTrace {
	if st,is := e.error.(StackTracer); is {
		return st.StackTrace()
	}
	if st,is := e.cause.(StackTracer); is {	return st.StackTrace() }
	return nil
}


func (e ErrCause) ToErrMetas(options ...ErrInfoFnc) *ErrInfo {
	return NewErrInfo(e,options...) }


func (e ErrCause) ToErrTrace(offset int) *ErrTrace {
	return NewErrTrace(e.error,offset) }


func (e ErrCause) String () string {
	return string(G.Formatter.Format(e)) }