/*
 *
 * Copyright 2020 The KubeSphere 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 identityprovider

import (
	"errors"
	"k8s.io/apiserver/pkg/authentication/user"
	"kubesphere.io/kubesphere/pkg/apiserver/authentication/oauth"
)

var (
	ErrorIdentityProviderNotFound = errors.New("the identity provider was not found")
	ErrorAlreadyRegistered        = errors.New("the identity provider was not found")
	oauthProviderCodecs           = map[string]OAuthProviderCodec{}
)

type OAuthProvider interface {
	IdentityExchange(code string) (user.Info, error)
}

type OAuthProviderCodec interface {
	Type() string
	Decode(options *oauth.DynamicOptions) (OAuthProvider, error)
	Encode(provider OAuthProvider) (*oauth.DynamicOptions, error)
}

func ResolveOAuthProvider(providerType string, options *oauth.DynamicOptions) (OAuthProvider, error) {
	if codec, ok := oauthProviderCodecs[providerType]; ok {
		return codec.Decode(options)
	}
	return nil, ErrorIdentityProviderNotFound
}

func ResolveOAuthOptions(providerType string, provider OAuthProvider) (*oauth.DynamicOptions, error) {
	if codec, ok := oauthProviderCodecs[providerType]; ok {
		return codec.Encode(provider)
	}
	return nil, ErrorIdentityProviderNotFound
}

func RegisterOAuthProviderCodec(codec OAuthProviderCodec) error {
	if _, ok := oauthProviderCodecs[codec.Type()]; ok {
		return ErrorAlreadyRegistered
	}
	oauthProviderCodecs[codec.Type()] = codec
	return nil
}