package protocol

import (
	"encoding/json"
	"git.noahlan.cn/noahlan/nnet/core"
	"git.noahlan.cn/noahlan/nnet/entity"
	"git.noahlan.cn/noahlan/nnet/middleware"
	"git.noahlan.cn/noahlan/nnet/packet"
	"git.noahlan.cn/noahlan/ntools-go/core/nlog"
	"time"
)

type (
	NNetConfig struct {
		HeartbeatInterval   time.Duration
		HandshakeValidator  HandshakeValidatorFunc
		HandshakeAckBuilder HandshakeAckBuilderFunc
	}

	handshakeData struct {
		Version      string `json:"version"`      // 客户端版本，服务器以此判断是否合适与客户端通信
		Type         string `json:"type"`         // 客户端类型，与客户端版本号一起来确定客户端是否合适
		ClientId     string `json:"clientId"`     // 客户端ID，服务器以此取值
		ClientSecret string `json:"clientSecret"` // 客户端密钥，服务器以此判定客户端是否可用

		// 透传信息
		Payload interface{} `json:"payload,optional,omitempty"`
	}

	HandshakeAckData struct {
		// 心跳间隔，单位秒 0表示不需要心跳
		Heartbeat int64 `json:"heartbeat"`

		// 路由
		Routes map[string]uint16 `json:"routes"` // route map to code
		Codes  map[uint16]string `json:"codes"`  // code map to route

		// 透传信息
		Payload interface{} `json:"payload,optional,omitempty"`
	}
)

func WithNNetProtocol(config NNetConfig) []core.RunOption {
	if config.HandshakeValidator == nil {
		config.HandshakeValidator = func(bytes []byte) error { return nil }
	}
	if config.HandshakeAckBuilder == nil {
		config.HandshakeAckBuilder = func() ([]byte, error) {
			defaultData := &HandshakeAckData{}
			return json.Marshal(defaultData)
		}
	}

	opts := []core.RunOption{
		WithNNetPipeline(config.HandshakeAckBuilder, config.HandshakeValidator),
		core.WithRouter(NewNNetRouter()),
		core.WithPacker(func() packet.Packer { return NewNNetPacker() }),
	}

	if config.HeartbeatInterval.Seconds() > 0 {
		packer := NewNNetPacker()
		hbd, err := packer.Pack(Handshake, nil)
		nlog.Must(err)

		opts = append(opts, middleware.WithHeartbeat(config.HeartbeatInterval, func(_ entity.NetworkEntity) []byte {
			return hbd
		}))
	}

	return opts
}