/*
 *     Copyright 2020 The Dragonfly Authors
 *
 * 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 dferrors

import (
	"errors"
	"fmt"

	"google.golang.org/grpc/status"

	commonv1 "d7y.io/api/v2/pkg/apis/common/v1"
)

// common and framework errors
var (
	ErrInvalidArgument = errors.New("invalid argument")
	ErrInvalidHeader   = errors.New("invalid Header")
	ErrDataNotFound    = errors.New("data not found")
	ErrEmptyValue      = errors.New("empty value")
	ErrConvertFailed   = errors.New("convert failed")
	ErrEndOfStream     = errors.New("end of stream")
	ErrNoCandidateNode = errors.New("no candidate server node")
)

// IsEndOfStream returns true if the error is end of stream.
func IsEndOfStream(err error) bool {
	return err == ErrEndOfStream
}

type DfError struct {
	Code    commonv1.Code
	Message string
}

func (s *DfError) Error() string {
	return fmt.Sprintf("[%d]%s", s.Code, s.Message)
}

func New(code commonv1.Code, msg string) *DfError {
	return &DfError{
		Code:    code,
		Message: msg,
	}
}

func Newf(code commonv1.Code, format string, a ...any) *DfError {
	return &DfError{
		Code:    code,
		Message: fmt.Sprintf(format, a...),
	}
}

func CheckError(err error, code commonv1.Code) bool {
	if err == nil {
		return false
	}

	e, ok := err.(*DfError)

	return ok && e.Code == code
}

// ConvertGRPCErrorToDfError converts grpc error to DfError, if it exists.
func ConvertGRPCErrorToDfError(err error) error {
	for _, d := range status.Convert(err).Details() {
		switch internal := d.(type) {
		case *commonv1.GrpcDfError:
			return &DfError{
				Code:    internal.Code,
				Message: internal.Message,
			}
		}
	}

	return err
}

// IsGRPCDfError checks if the error is a GRPCDfError.
func IsGRPCDfError(err error) (*DfError, bool) {
	for _, d := range status.Convert(err).Details() {
		switch internal := d.(type) {
		case *commonv1.GrpcDfError:
			return &DfError{
				Code:    internal.Code,
				Message: internal.Message,
			}, true
		}
	}

	var de *DfError
	ok := errors.As(err, &de)
	if ok {
		return de, true
	}

	return nil, false
}

// ConvertDfErrorToGRPCError converts DfError to grpc error, if it is.
func ConvertDfErrorToGRPCError(err error) error {
	if v, ok := err.(*DfError); ok {
		s, e := status.Convert(err).WithDetails(
			&commonv1.GrpcDfError{
				Code:    v.Code,
				Message: v.Message,
			})
		if e == nil {
			err = s.Err()
		}
	}
	return err
}