package main

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

var options struct {
	bombCost       int
	bombSpeed      float64
	debug          bool
	economic       int
	frameLength    time.Duration
	colonyCost     int
	frameRate      int
	lightSpeed     float64 // the distance that light travels in one tick
	makeBombTime   time.Duration
	makeColonyTime time.Duration
	makeShieldTime time.Duration
	moneyMean      float64
	moneySigma     float64
	playerSpeed    float64
	respawnFrames  int64
	respawnTime    time.Duration
	scanTime       time.Duration
	speckPath      string
	startBombs     int
	startMoney     int
}

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

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(sock net.Conn) {
	conn := NewConnection(sock)
	defer conn.Close()

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

	for {
		conn, err := listener.Accept()
		if err != nil {
			log_error("error accepting connection: %v", err)
			continue
		}
		go handleConnection(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", "./expl.speck", "path to exoplanet speck file")
	flag.DurationVar(&options.respawnTime, "respawn-time", 60*time.Second, "time for player respawn")
	flag.DurationVar(&options.makeBombTime, "bomb-time", 5*time.Second, "time it takes to make a bomb")
	flag.IntVar(&options.bombCost, "bomb-cost", 500, "price of a bomb")
	flag.IntVar(&options.colonyCost, "colony-cost", 2000, "price of a colony")
	flag.DurationVar(&options.makeColonyTime, "colony-time", 15*time.Second, "time it takes to make a colony")
	flag.IntVar(&options.startBombs, "start-bombs", 0, "number of bombs a player has at game start")
	flag.IntVar(&options.startMoney, "start-money", 1000, "amount of money a player has to start")
	flag.DurationVar(&options.makeShieldTime, "shield-time", 15*time.Second, "time it takes to make a shield")
	flag.DurationVar(&options.scanTime, "scan-recharge", 1*time.Minute, "time it takes for scanners to recharge")
}