// ------------------------------------------------------------------------
//   Project active2
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  error_list.go
//   Created by DEV
//   Modified   21/03/2024
//
//   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


type (

	ErrList []error

)


func MakeErrList (err ...error) ErrList {
	return append([]error(nil),err ...) }



func (l ErrList) Any () bool {
	for _,e := range l {
		if e != nil {
			return true
		}
	}
	return false
}


func (l ErrList) Len () int {
	return len(l) }


func (l ErrList) Count () int {
	c:=0
	for _,e := range l {
		if e != nil {
			c++
		}
	}
	return c
}


func (l ErrList) First () error {
	for _,e := range l {
		if e != nil {
			return e
		}
	}
	return nil
}

func (l ErrList) Last () error {
	for i := len(l) - 1; i >= 0; i-- {
		if l[i] != nil {
			return l[i]
		}
	}
	return nil
}





// Clean removes any nil errors from the list.
func (l ErrList) Clean() ErrList {
	return l.filter(func(e error) bool {
		return e != nil }) }


func (l ErrList) filter(filter func(error) bool) ErrList {
	rs := make([]error, 0, len(l))
	for _, e := range l {
		if filter(e) {
			rs = append(rs, e)
		}
	}
	return rs
}