package main

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

var hp = flag.Int("hp", 150, "")
var speed = flag.Float64("speed", 150, "")
var weaponRadius = flag.Int("wrad", 100, "weapon radius")
var scannerRadius = flag.Int("srad", 100, "scanner radius")
var server = flag.String("server", "localhost", "server hostname")
var port = flag.Int("port", 8666, "server port")
var botname = flag.String("name", "gobot", "the name that other players will see")

type infos struct {
	id            string
	width, height float64
}

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

func createGame() (string, error) {
	resp, err := http.Get("http://localhost:8666/game/start/")
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	var g struct {
		Id string `json:"id"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&g); err != nil {
		return "", err
	}
	return g.Id, err
}

func negociate(ws *websocket.Conn, gameid string) (i *infos, err error) {
	log.Printf("trying to connect to game %s", gameid)
	err = websocket.JSON.Send(ws, bot.GameID{
		gameid,
	})
	if err != nil {
		return nil, err
	}

	var idreq bot.IdRequest
	err = websocket.JSON.Receive(ws, &idreq)
	if err != nil || idreq.Type == "failure" {
		return nil, errors.New(fmt.Sprintf("failure: %+v", idreq))
	}
	log.Printf("%+v", idreq)

	err = websocket.JSON.Send(ws, bot.ClientID{
		Name:      *botname,
		Useragent: "gobot",
		Type:      "robot",
	})
	if err != nil {
		return nil, err
	}

	var gameparam bot.GameParam
	err = websocket.JSON.Receive(ws, &gameparam)
	log.Printf("gameparam: %+v", gameparam)
	if gameparam.Type != "gameparam" {
		return nil, errors.New("didn't receive a good gameparam")
	}
	log.Printf("%+v", gameparam)

	err = websocket.JSON.Send(ws, &bot.Config{
		ID:   gameid,
		Name: *botname,
		Stats: bot.Stats{
			Hp:            *hp,
			Speed:         *speed,
			WeaponRadius:  *weaponRadius,
			ScannerRadius: *scannerRadius,
		},
	})

	var handshake bot.Handshake
	websocket.JSON.Receive(ws, &handshake)
	if !handshake.Success {
		return nil, errors.New("failed to validate correct stats request")
	}
	log.Printf("%+v", handshake)
	return &infos{
		id:     idreq.AssignedID,
		width:  gameparam.BoardSize.Width,
		height: gameparam.BoardSize.Height,
	}, err
}

func main() {
	var err error
	var gameid string
	flag.Parse()
	if flag.NArg() < 1 {
		gameid, err = createGame()
		if err != nil {
			log.Fatal(err)
		}
	} else {
		gameid = flag.Arg(0)
	}

	ws, err := connect()
	if err != nil {
		log.Fatal(err)
	}
	board_info, err := negociate(ws, gameid)
	if err != nil {
		log.Fatal(err)
	}

	// TODO: var target govector.Point2d
	moveto := govector.Point2d{
		X: rand.Float64() * board_info.width,
		Y: rand.Float64() * board_info.height,
	}
	log.Printf("%+v", moveto)

	var me bot.Robot

	log.Printf("negociated well, starting loop")
	for {
		var boardstate bot.Boardstate
		err = websocket.JSON.Receive(ws, &boardstate)
		if err != nil {
			log.Fatal("Connection lost")
		}
		for _, bot := range boardstate.Robots {
			if bot.Id == board_info.id {
				me = bot
				break
			}
		}
		log.Printf("%+v: %+v", me.Position, moveto)
		if govector.Distance(me.Position, moveto) < 3.0 {
			moveto = govector.Point2d{
				X: rand.Float64() * board_info.width,
				Y: rand.Float64() * board_info.height,
			}
		}

		// TODO: send instructions
		log.Printf("%+v: %+v", me.Position, moveto)
		err = websocket.JSON.Send(ws, bot.Instruction{
			MoveTo: &moveto,
		})
		if err != nil {
			log.Fatal(err)
		}
	}
}