package main

import (
	"bytes"
	"context"
	"log"
	gen "slimming/proto/gen"
	"sync"
	"time"

	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
)

type RPCClient struct {
	Frames [][]byte

	realAddr string
	conn     *grpc.ClientConn
	lock     sync.Mutex

	trigger chan bool
}

func NewRPCClient(realAddr string) *RPCClient {
	return &RPCClient{
		realAddr: realAddr,

		Frames:  make([][]byte, 0, 1000),
		conn:    nil,
		lock:    sync.Mutex{},
		trigger: make(chan bool),
	}
}

func (cli *RPCClient) Lock(do func() bool) bool {
	cli.lock.Lock()
	defer cli.lock.Unlock()
	return do()
}

func (cli *RPCClient) CheckConnect() {

	if cli.Lock(func() bool {
		return cli.conn != nil
	}) {
		return
	}

	log.Println("rpcclient connect", cli.realAddr)
	// defer log.Println("rpcclient exit")

	conn, err := grpc.Dial(cli.realAddr,
		grpc.WithTransportCredentials(insecure.NewCredentials()),
	)
	if err != nil {
		log.Printf("did not connect: %v", err)
		return
	}

	cli.Lock(func() bool {
		cli.conn = conn
		return true
	})

	go cli.run()
}

func (cli *RPCClient) Push(frame []byte) {
	cli.Lock(func() bool {
		cli.Frames = append(cli.Frames, frame)
		if len(cli.Frames) >= 1000 {
			cli.trigger <- true
		}
		return true
	})
}

func (cli *RPCClient) run() {
	defer log.Println("rpcclient exit")
	defer func() {
		if err := recover(); err != nil {
			log.Println("recover", err)
			cli.Lock(func() bool {
				err = cli.conn.Close()
				if err != nil {
					log.Println(err)
				}
				cli.conn = nil
				return false
			})
		}
	}()

	cliService := gen.NewFrameServiceClient(cli.conn)
	stream, err := cliService.SendFrames(context.Background())
	if err != nil {
		log.Panic(err)
	}
	defer stream.CloseSend()

	var ticker = time.NewTicker(time.Millisecond * 200)

	buf := bytes.NewBuffer(nil)
	for {

		select {
		case <-cli.trigger:
		case <-ticker.C:
		}

		if !cli.Lock(func() bool {
			if len(cli.Frames) == 0 {
				return false
			}

			Compress(buf, cli.Frames)

			if len(cli.Frames) >= 2 {
				var countbuf = 0
				for _, frame := range cli.Frames {
					countbuf += len(frame)
				}
				log.Printf("src size: %d compressed size: %d", countbuf, len(buf.Bytes()))
			}

			cli.Frames = cli.Frames[:0]
			return true
		}) {
			continue
		}

		// 发到对面的网卡
		err = stream.Send(&gen.RequestFrames{
			Frames: buf.Bytes(),
		})
		if err != nil {
			log.Panic(err)
		}
		buf.Reset()
	}
}