package main

import (
	"flag"
	"fmt"
	"log"
	"math/rand"
	"net"
	"os"
	"time"
)

var options struct {
	bombSpeed     float64
	debug         bool
	economic      int
	frameRate     int
	frameLength   time.Duration
	lightSpeed    float64
	moneyMean     float64
	moneySigma    float64
	playerSpeed   float64
	respawnTime   time.Duration
	respawnFrames int64
	speckPath     string
}

var (
	info_log    *log.Logger
	error_log   *log.Logger
	currentGame *Game
)

func log_error(template string, args ...interface{}) {
	error_log.Printf(template, args...)
}

func log_info(template string, args ...interface{}) {
	info_log.Printf(template, args...)
}

func bail(status int, template string, args ...interface{}) {
	if status == 0 {
		fmt.Fprintf(os.Stdout, template, args...)
	} else {
		fmt.Fprintf(os.Stderr, template, args...)
	}
	os.Exit(status)
}

func handleConnection(conn *Connection) {
	defer conn.Close()
	conn.Login()

	c := make(chan []string)
	go conn.ReadLines(c)

	for parts := range c {
		conn.RunCommand(parts[0], parts[1:]...)
	}
}

// converts a duration in human time to a number of in-game frames
func durToFrames(dur time.Duration) int64 {
	return int64(dur / options.frameLength)
}

func framesToDur(frames int64) time.Duration {
	return options.frameLength * time.Duration(frames)
}

func main() {
	flag.Parse()
	dbconnect()
	options.frameLength = time.Second / time.Duration(options.frameRate)
	options.respawnFrames = durToFrames(options.respawnTime)

	rand.Seed(time.Now().UnixNano())
	info_log = log.New(os.Stdout, "[INFO] ", 0)
	error_log = log.New(os.Stderr, "[ERROR] ", 0)

	setupDb()
	listener, err := net.Listen("tcp", ":9220")
	if err != nil {
		bail(E_No_Port, "unable to start server: %v", err)
	}

	go func() {
		for {
			log_info("starting new game")
			currentGame = NewGame()
			currentGame.Run()
		}
	}()

	for {
		conn, err := listener.Accept()
		if err != nil {
			log_error("error accepting connection: %v", err)
			continue
		}
		go handleConnection(NewConnection(conn))
	}
}

func init() {
	flag.Float64Var(&options.lightSpeed, "light-speed", 0.01, "speed of light in parsecs per frame")
	flag.IntVar(&options.frameRate, "frame-rate", 100, "frame rate, in frames per second")
	flag.Float64Var(&options.playerSpeed, "player-speed", 0.8, "player travel speed, relative to C, the speed of light")
	flag.Float64Var(&options.bombSpeed, "bomb-speed", 0.9, "bomb travel speed, relattive to C, the speed of light")
	flag.IntVar(&options.economic, "economic", 25000, "amount of money needed to win economic victory")
	flag.Float64Var(&options.moneyMean, "money-mean", 10000, "mean amount of money on a system")
	flag.Float64Var(&options.moneySigma, "money-sigma", 1500, "standard deviation in money per system")
	flag.BoolVar(&options.debug, "debug", false, "puts the game in debug mode")
	flag.StringVar(&options.speckPath, "speck-path", "/projects/exo/expl.speck", "path to exoplanet speck file")
	flag.DurationVar(&options.respawnTime, "respawn-time", 60*time.Second, "time for player respawn")
}