ainsleyclark/errors

// Copyright 2022 Ainsley Clark. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package errors

import "fmt"

// Code returns the code of the root error, if available.
// Otherwise, returns INTERNAL.
func Code(err error) string {
    if err == nil {
        return ""
    } else if e, ok := err.(*Error); ok && e.Code != "" {
        return e.Code
    } else if ok && e.Err != nil {
        return Code(e.Err)
    }
    return INTERNAL
}

// Message returns the human-readable message of the error,
// if available. Otherwise, returns a generic error
// message.
func Message(err error) string {
    if err == nil {
        return ""
    } else if e, ok := err.(*Error); ok && e.Message != "" {
        return e.Message
    } else if ok && e.Err != nil {
        return Message(e.Err)
    }
    return GlobalError
}

// ToError Returns an application error from input. If The type
// is not of type Error, nil will be returned.
func ToError(err any) *Error {
    switch v := err.(type) {
    case *Error:
        return v
    case Error:
        return &v
    case error:
        return &Error{Err: fmt.Errorf(v.Error())}
    case string:
        return &Error{Err: fmt.Errorf(v)}
    default:
        return nil
    }
}