// Copyright © 2024 OpenIM. All rights reserved.
//
// 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 direct

import (
	"context"
	"errors"
	"fmt"

	"github.com/OpenIMSDK/tools/errs"
	config2 "github.com/openimsdk/open-im-server/v3/pkg/common/config"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
)

type ServiceAddresses map[string][]int

func getServiceAddresses(config *config2.GlobalConfig) ServiceAddresses {
	return ServiceAddresses{
		config.RpcRegisterName.OpenImUserName:           config.RpcPort.OpenImUserPort,
		config.RpcRegisterName.OpenImFriendName:         config.RpcPort.OpenImFriendPort,
		config.RpcRegisterName.OpenImMsgName:            config.RpcPort.OpenImMessagePort,
		config.RpcRegisterName.OpenImMessageGatewayName: config.LongConnSvr.OpenImMessageGatewayPort,
		config.RpcRegisterName.OpenImGroupName:          config.RpcPort.OpenImGroupPort,
		config.RpcRegisterName.OpenImAuthName:           config.RpcPort.OpenImAuthPort,
		config.RpcRegisterName.OpenImPushName:           config.RpcPort.OpenImPushPort,
		config.RpcRegisterName.OpenImConversationName:   config.RpcPort.OpenImConversationPort,
		config.RpcRegisterName.OpenImThirdName:          config.RpcPort.OpenImThirdPort,
	}
}

type ConnDirect struct {
	additionalOpts        []grpc.DialOption
	currentServiceAddress string
	conns                 map[string][]*grpc.ClientConn
	resolverDirect        *ResolverDirect
	config                *config2.GlobalConfig
}

func (cd *ConnDirect) GetClientLocalConns() map[string][]*grpc.ClientConn {
	return nil
}

func (cd *ConnDirect) GetUserIdHashGatewayHost(ctx context.Context, userId string) (string, error) {
	return "", nil
}

func (cd *ConnDirect) Register(serviceName, host string, port int, opts ...grpc.DialOption) error {
	return nil
}

func (cd *ConnDirect) UnRegister() error {
	return nil
}

func (cd *ConnDirect) CreateRpcRootNodes(serviceNames []string) error {
	return nil
}

func (cd *ConnDirect) RegisterConf2Registry(key string, conf []byte) error {
	return nil
}

func (cd *ConnDirect) GetConfFromRegistry(key string) ([]byte, error) {
	return nil, nil
}

func (cd *ConnDirect) Close() {

}

func NewConnDirect(config *config2.GlobalConfig) (*ConnDirect, error) {
	return &ConnDirect{
		conns:          make(map[string][]*grpc.ClientConn),
		resolverDirect: NewResolverDirect(),
		config:         config,
	}, nil
}

func (cd *ConnDirect) GetConns(ctx context.Context,
	serviceName string, opts ...grpc.DialOption) ([]*grpc.ClientConn, error) {

	if conns, exists := cd.conns[serviceName]; exists {
		return conns, nil
	}
	ports := getServiceAddresses(cd.config)[serviceName]
	var connections []*grpc.ClientConn
	for _, port := range ports {
		conn, err := cd.dialServiceWithoutResolver(ctx, fmt.Sprintf(cd.config.Rpc.ListenIP+":%d", port), append(cd.additionalOpts, opts...)...)
		if err != nil {
			fmt.Printf("connect to port %d failed,serviceName %s, IP %s\n", port, serviceName, cd.config.Rpc.ListenIP)
		}
		connections = append(connections, conn)
	}

	if len(connections) == 0 {
		return nil, errs.Wrap(errors.New("no connections found for service"), "serviceName", serviceName)
	}
	return connections, nil
}

func (cd *ConnDirect) GetConn(ctx context.Context, serviceName string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
	// Get service addresses
	addresses := getServiceAddresses(cd.config)
	address, ok := addresses[serviceName]
	if !ok {
		return nil, errs.Wrap(errors.New("unknown service name"), "serviceName", serviceName)
	}
	var result string
	for _, addr := range address {
		if result != "" {
			result = result + "," + fmt.Sprintf(cd.config.Rpc.ListenIP+":%d", addr)
		} else {
			result = fmt.Sprintf(cd.config.Rpc.ListenIP+":%d", addr)
		}
	}
	// Try to dial a new connection
	conn, err := cd.dialService(ctx, result, append(cd.additionalOpts, opts...)...)
	if err != nil {
		return nil, errs.Wrap(err, "address", result)
	}

	// Store the new connection
	cd.conns[serviceName] = append(cd.conns[serviceName], conn)
	return conn, nil
}

func (cd *ConnDirect) GetSelfConnTarget() string {
	return cd.currentServiceAddress
}

func (cd *ConnDirect) AddOption(opts ...grpc.DialOption) {
	cd.additionalOpts = append(cd.additionalOpts, opts...)
}

func (cd *ConnDirect) CloseConn(conn *grpc.ClientConn) {
	if conn != nil {
		conn.Close()
	}
}

func (cd *ConnDirect) dialService(ctx context.Context, address string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
	options := append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))
	conn, err := grpc.DialContext(ctx, cd.resolverDirect.Scheme()+":///"+address, options...)

	if err != nil {
		return nil, errs.Wrap(err, "address", address)
	}
	return conn, nil
}

func (cd *ConnDirect) dialServiceWithoutResolver(ctx context.Context, address string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
	options := append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))
	conn, err := grpc.DialContext(ctx, address, options...)

	if err != nil {
		return nil, err
	}
	return conn, nil
}