client/robot.go

package main

import (
	"bitbucket.org/hackerbots/vector"
	"code.google.com/p/go.net/websocket"
	"errors"
	"fmt"
	"log"
	"math/rand"
)

func connect() (*websocket.Conn, error) {
	origin := "http://localhost/"
	url := fmt.Sprintf("ws://%s:%d/ws/", *server, *port)
	return websocket.Dial(url, "", origin)
}

type robot struct {
	ws       *websocket.Conn
	game     GameParam
	playerId string
}

func NewRobot(
	server string,
	port int,
	gameName string,
	hp,
	speed,
	acceleration,
	weaponRadius,
	scannerRadius,
	fireRate int) (*robot, error) {
	ws, err := connect()
	if err != nil {
		return nil, errors.New(fmt.Sprintf("connection failure: %s", err))
	}
	r := &robot{
		ws: ws,
	}

	// XXX: update with missing fields
	statsReq := StatsRequest{
		Hp:            hp,
		Speed:         speed,
		Acceleration:  acceleration,
		WeaponRadius:  weaponRadius,
		ScannerRadius: scannerRadius,
		TurnSpeed:     50,
		FireRate:      fireRate,
		WeaponDamage:  50,
		WeaponSpeed:   50,
	}

	err = r.negociate(statsReq, gameName)

	return r, nil
}

func (r *robot) negociate(req StatsRequest, gameName string) (err error) {
	log.Printf("trying to connect to game '%s'", gameName)

	err = websocket.JSON.Send(r.ws, struct {
		Id string `json:"id"`
	}{
		gameName,
	})
	if err != nil {
		return err
	}

	var idreq struct {
		Type     string `json:"type"`
		PlayerId string `json:"id"`
	}
	err = websocket.JSON.Receive(r.ws, &idreq)
	if err != nil || idreq.Type == "failure" {
		return errors.New(fmt.Sprintf("failure: %+v", idreq))
	}
	log.Printf("idreq: %+v", idreq)

	err = websocket.JSON.Send(r.ws, struct {
		Type      string `json:"type"`
		Name      string `json:"name"`
		Useragent string `json:"useragent"`
	}{
		Name:      *botname,
		Useragent: "gobot",
		Type:      "robot",
	})
	if err != nil {
		return err
	}
	err = websocket.JSON.Receive(r.ws, &r.game)
	if r.game.Type != "gameparam" {
		return errors.New("didn't receive a good gameparam")
	}
	r.game.name = gameName
	log.Printf("game parameters: %+v", r.game)

	conf := ClientConfig{
		ID: gameName,
		Stats: map[string]StatsRequest{
			*botname: req,
		},
	}

	err = websocket.JSON.Send(r.ws, conf)

	var handshake struct {
		Id      string `json:"id"`
		Success bool   `json:"success"`
		Type    string `json:"type"`
	}
	websocket.JSON.Receive(r.ws, &handshake)
	if !handshake.Success {
		return errors.New("failed to validate correct stats request")
	}
	r.playerId = handshake.Id
	log.Printf("handshake: %+v", handshake)
	return nil
}

func (r *robot) play() {
	var err error
	// TODO: var target govector.Point2d
	moveto := govector.Point2d{
		X: rand.Float32() * r.game.BoardSize.Width,
		Y: rand.Float32() * r.game.BoardSize.Height,
	}
	log.Printf("moveto: %+v", moveto)

	var me Robot

	log.Printf("%s: starting loop", r.playerId)
	for {
		var boardstate Boardstate
		err = websocket.JSON.Receive(r.ws, &boardstate)
		if *verbose {
			log.Printf("%+v", boardstate)
		}
		if err != nil {
			log.Fatal("Connection lost")
		}
		me = boardstate.MyRobots[0]
		if govector.Distance(me.Position, moveto) < 3.0 {
			log.Printf("old: %+v: %+v", me.Position, moveto)
			moveto = govector.Point2d{
				X: rand.Float32() * r.game.BoardSize.Width,
				Y: rand.Float32() * r.game.BoardSize.Height,
			}
			log.Printf("new: %+v: %+v", me.Position, moveto)
		}

		// TODO: send instructions
		instruction := map[string]Instruction{
			me.Id: {
				MoveTo: &moveto,
				FireAt: &moveto,
			},
		}
		err = websocket.JSON.Send(r.ws, instruction)
		if err != nil {
			log.Fatal(err)
		}
	}
}