/*
 * Copyright (c) 2022, Alibaba Group;
 * 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 rpc_client

import (
	"fmt"
	"strings"

	"github.com/pkg/errors"

	"github.com/alibaba/ioc-golang/autowire"
	"github.com/alibaba/ioc-golang/autowire/util"
	"github.com/alibaba/ioc-golang/config"
)

type tagPointToConfigParamLoader struct {
}

func getTagPointToConfigPrefix(autowireType string, sd *autowire.StructDescriptor, instanceName string) string {
	pointToKey := sd.Alias
	if pointToKey == "" {
		pointToKey, _ = util.ToRPCClientStubInterfaceSDID(util.GetSDIDByStructPtr(sd.Factory()))
	}
	return fmt.Sprintf("autowire%[1]s%[2]s%[1]s<%[3]s>%[1]s%[4]s%[1]sparam", config.YamlConfigSeparator, autowireType, pointToKey, instanceName)
}

var tagPointToConfigSingleton autowire.ParamLoader

func getTagPointToConfigParamLoader() autowire.ParamLoader {
	if tagPointToConfigSingleton == nil {
		tagPointToConfigSingleton = &tagPointToConfigParamLoader{}
	}
	return tagPointToConfigSingleton
}

func (p *tagPointToConfigParamLoader) Load(sd *autowire.StructDescriptor, fi *autowire.FieldInfo) (interface{}, error) {
	if fi == nil || sd == nil || sd.ParamFactory == nil {
		return nil, errors.New("not supported")
	}

	param := sd.ParamFactory()

	splitedTagValue := strings.Split(fi.TagValue, ",")
	if len(splitedTagValue) < 2 {
		return nil, errors.New("tag value not supported")
	}
	prefix := getTagPointToConfigPrefix(fi.TagKey, sd, splitedTagValue[1])
	if err := config.LoadConfigByPrefix(prefix, param); err != nil {
		return nil, err
	}
	return param, nil
}
